Datex-Ohmeda

S/5™ M-Modules
Technical Reference Manual

All specifications are subject to change without notice.

Document No. M1025359

June 2005

Datex-Ohmeda, Inc. GE Healthcare Finland Oy

Helsinki, Finland
P.O. Box 7550, Madison
P.O. Box 900
WI 53707-7550, USA
FIN-00031 GE, FINLAND
Tel. 1-608-221-1551
Tel. +358 10 394 11 Fax +358 9 146 3310
Fax 1-608-222-9147
www.datex-ohmeda.com www.gehealthcare.com
© 2005 Copyright General Electric Company
Responsibility of the manufacturer
GE Healthcare Finland Oy(GE) is responsible for the safety, reliability and performance of the equipment only
if:
− modifications, service and repairs are carried out by personnel authorized by GE.
− the electrical installation complies with appropriate requirements.
− the equipment is used in accordance with the User’s Guide and serviced and maintained in
accordance with the Technical Reference Manual.

Trademarks
Datex, Ohmeda, S/5, D-lite, D-lite+, Pedi-lite, Pedi-lite+, Mini D-fend, D-fend,
D-fend+, OxyTip+, MemCard, ComWheel, EarSat, FingerSat, FlexSat, PatientO2, Entropy, Patient Spirometry
and Tonometrics are trademarks of GE Healthcare Finland Oy. All other product and company names are
property of their respective owners.

Copyright
© 2005 Copyright General Electric Company
All specifications subject to change without notice.
 Table of contents

Master Table of Contents

Technical Reference Manual, S/5™ M-Modules
M1025359

For S/5™ Anesthesia Monitor and Critical Care Monitor

and S/5™ Compact Anesthesia Monitor and Compact Critical Care Monitor

Document No. Updated Updated Description

8001008 -6 Hemodynamic Modules, 1
M-NE12STPR, M-NE12STR, M-NE12TPR, M-NESTPR, M-NESTR,
M-NETPR, M-ESTPR, M-ESTR, M-ETPR
8001009 –5 Compact Airway Modules, M-CAiOVX, M-CAiOV,M-CAiO, M-COVX, 2
M-COV, M-CO, M-C
8001010 –4 Tonometry Module, M-TONO 3
8001011 –4 EEG Module, M-EEG and EEG Headbox, N-EEG 4
8001012 –4 Cardiac Output Modules, M-COP and M-COPSv 5
8001013 –4 Pressure Module, M-P, Pressure Temp Module, M-PT 6
8001014 –4 Dual Pressure Module, M-PP 7
8001015 –5 NIBP Module, M-NIBP 8
8001016 –3 Recorder Module, M-REC 9
8005426 –1 Oxygen Saturation Modules, M-NSAT, M-OSAT 10
8001018 –4 NeuroMuscular Transmission Module, M-NMT 11
8003840 –1 Anesthesia recordkeeping keyboard for, K-ARKB, Keyboard 12
Interface Board, B-ARK and ARK Barcode Reader, N-SCAN
8001020 –5 Memory Module, M-MEM 13
8001021 –4 Interface Module, M-INT 14
8005676 Device Interfacing Solution, N-DISxxxx 15
8003476-2 BIS Module, M-BIS 16
8003934-1 Remote Controllers, K-REMCO, K-CREMCO 17
8003487-3 Single-width Airway Module, M-miniC 18
8004390 Entropy Module, M-ENTROPY 19
8005571-1 PRETSN Module 20
8001005-5 Airway Modules, G-AiOV, G-AiO, G-AOV, G-AO, Gas Interface Board 21
B-GAS

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 Introduction

INTRODUCTION
This Technical Reference Manual provides information for the maintenance and service of the
Datex-Ohmeda S/5™ M-Modules, record keeping keyboard, remote controllers and Device
Interfacing System. These Datex-Ohmeda devices are designed for use with S/5™ Anesthesia
Monitor, S/5™ Critical Care Montor, S/5™ Compact Anesthesia Monitor, and S/5™ Compact
Critical Care Monitor.
Please see also the Technical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
For more detailed information about compatibility with different monitor software types and levels
se the "Introduction" chapter of the slot of the module or other device.

S/5™ parameter modules, Device Interfacing Solution, Record keeping keyboard and Remote Controller

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Notes to the reader

This Technical Reference Manual is intended for service personnel and engineers who will perform
service and maintenance procedures on the Datex-Ohmeda S/5 Anesthesia Monitor,S/5 Critical
Care Monitor, S/5 Compact Anesthesia Monitor or S/5 Compact Critical Care Monitor.
This Technical Reference Manual completes the Technical Reference Manual of the S/5 Anesthesia
Monitor and S/5 Critical Care Monitor or S/5 Compact Anesthesia Monitor and S/5 Compact
Critical Care Monitor.
• Document number M1025359 is the order number for the whole printed manual. This
manual includes Technical Reference Manual Slots and every slot has own document
number.
• The Technical Reference Manual, S/5 Modules gives detailed descriptions of paramter
modules and other products that can be used with all S/5 modular monitors. Service check
for each product is included in these slots.
For monitor or system specific information see:
The Technical Reference Manual of the S/5 Anesthesia Monitor and S/5 Critical Care Monitor or
The Technical Reference Manual of S/5 Compact Anesthesia Monitor and S/5 Compact Critical
Care Monitor.
The manufacturer reserves the right to change product specifications without prior notice. Although
the information in this manual is believed to be accurate and reliable, the manufacturer assumes
no responsibility for its use.
GE Healthcare Finland Oy (GE) assumes no responsibility for the use or reliability of its software in
equipment that is not furnished by GE.

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 Introduction

Conventions used
Throughout this manual, the following conventions are used to distinguish procedures or elements
of text:
Sign the check form after performing the procedure.
"
Hard Keys Hard key names on the Command Board, the Remote Controller, and modules are written in bold
D-O Sans (12 pt) typeface, e.g. ECG.
Menu Items Menu items are written in bold italic, D-O Sans (11 pt) typeface, e.g. ECG Setup.

‘Messages’ Messages displayed on the screen are enclosed in single quotes, e.g. ‘Please wait’.
Chapters When referring to different chapters in the same manual, the chapter name is written in italic
typeface and is enclosed in double quotes, e.g. chapter “Cleaning and Care.”
Other documents
When referring to different documents, the document name is written in italic typeface, e.g. refer to
User’s Reference Manual.
Hypertext links Hypertext links on PDF versions are written in blue color.
WARNING Warnings are written in bold typeface (13 pt), for example:

WARNING Use only hospital-grade electrical outlets and power cord.

CAUTION Cautions are written in the following way (13 pt):
CAUTION The circuit boards contain sensitive integrated circuits that can be damaged by an
electrostatic discharge. Careful handling of the boards is therefore essential.

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 Datex-Ohmeda Hemodynamic modules
TM
S/5 NE12STPR Module, M-NE12STPR (rev. 02)
S/5TM NE12STR Module, M-NE12STR (rev. 02)
S/5TM NE12TPR Module, M-NE12TPR (rev. 02)
S/5TM NESTPR Module, M-NESTPR (rev. 01)
S/5TM NESTR Module, M-NESTR (rev. 01)
S/5TM NETPR Module, M-NETPR (rev. 01)
S/5TM ESTPR Module, M-ESTPR (rev. 04)
S/5TM ESTR Module, M-ESTR (rev. 04)
S/5TM ETPR Module, M-ETPR (rev. 04)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1008-6

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
HEMODYNAMIC MODULES
TABLE OF CONTENTS i
Table of figures iii
Introduction 1
1 Specifications 3
1.1 General specifications ..............................................................................................................................3
1.2 Typical performance .................................................................................................................................3
1.2.1 NIBP ................................................................................................................................................3
1.2.2 ECG .................................................................................................................................................4
1.2.3 Pulse oximetry..................................................................................................................................4
1.2.4 Temperature.....................................................................................................................................5
1.2.5 Invasive blood pressure ....................................................................................................................5
1.2.6 Respiration ......................................................................................................................................5
1.3 Technical specifications............................................................................................................................6
1.3.1 NIBP ................................................................................................................................................6
1.3.2 ECG .................................................................................................................................................6
1.3.3 Pulse oximetry..................................................................................................................................7
1.3.4 Temperature.....................................................................................................................................7
1.3.5 Invasive blood pressure ....................................................................................................................7
1.3.6 Respiration ......................................................................................................................................7
2 Functional Description 8
2.1 Measurement principle .............................................................................................................................8
2.1.1 NIBP ................................................................................................................................................8
2.1.2 ECG .................................................................................................................................................8
2.1.3 Pulse oximetry..................................................................................................................................8
2.1.4 Temperature...................................................................................................................................10
2.1.5 Invasive blood pressure ..................................................................................................................11
2.1.6 Respiration ....................................................................................................................................11
2.2 Main components...................................................................................................................................11
M-ESTPR/-ETPR/-ESTR modules...............................................................................................................11
M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR modules .................................................12
2.2.3 NIBP board ....................................................................................................................................13
2.2.4 ECG board in 3-and 5-lead measurement........................................................................................15
2.2.5 ECG board in 12-lead measurement ...............................................................................................17
2.2.6 ECG filtering ...................................................................................................................................19
2.2.7 STP board ......................................................................................................................................20
2.3 Connectors and signals...........................................................................................................................25
2.3.1 Module bus connector ....................................................................................................................25
2.3.2 Front panel connectors ...................................................................................................................26
2.3.3 Test points on boards .....................................................................................................................27
3 Service Procedures 29
3.1 General service information.....................................................................................................................29
3.2 Service check .........................................................................................................................................29

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3.2.1 Recommended tools ......................................................................................................................29

3.2.2 Recommended parts......................................................................................................................29
3.3 Disassembly and reassembly..................................................................................................................40
3.3.1 M-ESTPR, M-ESTR, and M-ETPR modules ........................................................................................40
3.3.2 M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR modules .......................................40
3.4 Adjustments and calibrations..................................................................................................................41
3.4.1 Pressure safety level detection “OFFSET”.........................................................................................41
3.4.2 NIBP calibrations ...........................................................................................................................41
3.4.3 Temperature calibration .................................................................................................................43
3.4.4 Invasive pressure calibration ..........................................................................................................43
4 Troubleshooting 45
4.1 Troubleshooting charts ...........................................................................................................................45
4.1.1 NIBP..............................................................................................................................................45
4.1.2 NIBP error code explanation ...........................................................................................................48
4.1.3 ECG...............................................................................................................................................49
4.1.4 Pulse oximetry (SpO2).....................................................................................................................49
4.1.5 Temperature ..................................................................................................................................50
4.1.6 Invasive blood pressure..................................................................................................................51
4.1.7 Impedance respiration ...................................................................................................................52
4.2 Troubleshooting flowcharts .....................................................................................................................53
4.2.1 M-NE12STPR and M-NESTPR module troubleshooting.....................................................................53
4.2.2 M-ESTPR, M-ESTR, and M-ETPR module troubleshooting .................................................................54
5 Service Menu 55
5.1 NIBP service menu .................................................................................................................................56
5.1.1 NIBP demo menu...........................................................................................................................57
5.1.2 NIBP calibration menu....................................................................................................................58
5.1.3 NIBP safety valve menu ..................................................................................................................59
5.1.4 NIBP pulse valve menu...................................................................................................................60
5.1.5 NIBP buttons/leds menu................................................................................................................61
5.1.6 NIBP pneumatics menu..................................................................................................................62
5.1.7 NIBP watchdog menu .....................................................................................................................63
5.2 ECG service menu ..................................................................................................................................64
5.2.1 ECG setup menu ............................................................................................................................66
5.3 STP service menu ...................................................................................................................................67
5.3.1 STP calibration menu .....................................................................................................................69
6 Spare Parts 70
6.1 Spare parts list .......................................................................................................................................70
6.1.1 M-ESTP rev. 01, M-ETP rev. 00, M-EST rev. 00 .................................................................................70
6.1.2 M-NESTPR rev. 00, M-NETPR rev. 00, M-NESTR rev. 00....................................................................74
6.1.3 M-NE12STPR rev. 00, M-NE12STR rev. 00, M-NE12TPR rev. 00.......................................................78
7 Earlier Revisions 81
APPENDIX A 83
Service Check Form 1

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TABLE OF FIGURES
Figure 1 S/5 NE12STPR Module, M-NE12STPR ................................................................................1
Figure 2 Absorption of infrared light in the finger probe parts layout and schematic diagram..............10
Figure 3 Front panel of M-ESTPR.....................................................................................................11
Figure 4 Front panel of M-NESTPR ..................................................................................................12
Figure 5 NIBP board functional block diagram.................................................................................13
Figure 6 3- and 5- lead ECG board block diagram ...........................................................................15
Figure 7 12-lead ECG measurement block diagram.........................................................................17
Figure 8 STP board block diagram...................................................................................................20
Figure 9 Temperature measurement principle .................................................................................21
Figure 10 Pressure measurement principle .......................................................................................21
Figure 11 Pulse oximetry measurement block diagram ......................................................................22
Figure 12 Serial communication and opto isolation of M-NESTPR/-NE12STPR ...................................23
Figure 13 Serial communication and opto isolation of M-ESTPR.........................................................24
Figure 14 Module bus connector (X1) pin layout ................................................................................25
Figure 15 M-NE12STPR and M-NESTPR module troubleshooting flowchart.........................................53
Figure 16 M-ESTPR Module Troubleshooting Flowchart......................................................................54
Figure 17 Exploded view of M-ESTP Module ......................................................................................70
Figure 18 Exploded view of M-NESTPR Module..................................................................................74
Figure 19 Exploded view of M-NE12STPR Module..............................................................................78

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 S/5 Hemodynamic modules

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
hemodynamic modules. The S/5 M-ESTPR/-ESTR/-ETPR and S/5 M-NE12STPR/-NE12STR/-
NE12TPR/-NESTPR/-NESTR/-NETPR are double width modules designed for use with S/5
monitors. Later in this manual modules may be referred to w/o the system name S/5 for simplicity.
Please refer to the Technical Reference Manual of the S/5 monitor for information related to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.
The M-ESTPR/-ESTR/-ETPR and M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR
modules provide general hemodynamic parameters

NOTE: Do not use identical modules in

the same monitor simultaneously.
The following modules are considered
identical:
M-ESTP/-EST/-ETP,
M-ESTPR/-ESTR/-ETPR,
M-NESTPR/-NESTR/-NETPR,
M-NE12STPR/-NE12STR/-NE12TPR

Figure 1 S/5 NE12STPR Module, M-NE12STPR

Table 1 Options of S/5 hemodynamic modules

Parameter NE12STPR NESTPR NE(12) NE(12) ESTPR ESTR ETPR

STR TPR
12 12-lead ECG • (•) (•)
N NIBP • • • •
E ECG • • • • • • •
S Pulse oximetry • • • • •
T Two temperatures • • • • • • •
P Two invasive blood pressures • • • • •
R Impedance respiration • • • • • • •

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NOTE: 12-lead ECG measurement requires Display Controller, B-DISP.

NOTE: M-ESTP rev. 01, M-EST rev. 00 and M-ETP rev. 00 work only with S-STD93, S-STD94, S-ARK94, S-STD95, S-
ARK95, S-STD96 and S-ARK96 software.

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1 SPECIFICATIONS

1.1 General specifications

Module size 75 × 180 × 112 mm
W×D×H 3.0 × 7.1 × 4.4 in
Operation temperature 10 to 40 °C / 50 to 104 °F

@ M-ESTPR/-ETPR/-ESTR
Module weight 0.6 kg / 1.3 lbs
Power consumption 6W

@ M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR
Module weight 1 kg
Power consumption about 9 W

1.2 Typical performance

1.2.1 NIBP
NOTE:Non-invasive blood pressure measurement is intended for patients weighing over 5 kg (11
lb.)
Oscillometric measurement principle.
Measurement range adult 25 to 260 mmHg
child 25 to 195 mmHg
infant 15 to 145 mmHg
Pulse rate range accepted 30 to 250 bpm
Measurement interval 1, 2.5, 3, 5, 10, 15, 30, 60 min (=1h), 2h, 4h
Typical measuring time adult 23 s
infant 20 s
Initial inflation pressure adult 185 ±10 mmHg
child 150 ±10 mmHg
infant 120 ±10 mmHg
Venous stasis adult 80 ±10 mmHg / 2 min.
child 60 ±10 mmHg / 2 min.
infant 40 ±10 mmHg / 1 min.
Cuff widths please see User’s Guide

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1.2.2 ECG
Lead selection, 12-lead ECG I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6
Lead selection, oher modules I, II, III, aVR, aVL, aVF, V
Sweep speeds 12.5, 25, 50 mm/sec
DISPLAY FILTER
Diagnostic, 12-lead ECG 0.05 to 150 Hz
Diagnostic, other modules 0.05 to 100 Hz
Monitoring 0.5 to 30 Hz (-3 dB, with 50 Hz reject filter)
0.5 to 40 Hz (-3 dB, with 60 Hz reject filter)
ST filter 0.05 to 30 Hz (-3 dB, with 50 Hz reject filter)
0.05 to 40 Hz (-3 dB, with 60 Hz reject filter)
HEART RATE FROM ECG
Range 30 to 250 bpm
Accuracy ±5 bpm or ±5 %, whichever is greater
Resolution 1 bpm
Update interval 5s
Averaging time 10 s
ST LEVELS (in main software)
ST level range -9 to +9 mm (-0.9 to +0.9 mV)
Resolution 0.1 mm (0.01 mV)
Averaging calculated from 8 QRS
SYNCHRONIZATION
Direct ECG analog output of ECG, 1 V/1 mV
Pacer 5 V and 0.5 to 2.5 ms pulse, < 30 ms after pacer peak
Defibrillator 5 V and 10 ms pulse, < 35 ms after R-point synchronization

1.2.3 Pulse oximetry

Measurement range 40 to 100 %
Accuracy 100 to 80 %, ±2 digits
1
(% SpO2 ±1 SD) 80 to 50 %, ±3 digits
50 to 40 %, unspecified
Display resolution 1 digit = 1 % of SpO2
Display averaging time 20, 10 sec, beat-to-beat
Pulse beep pitch varies with SpO2 level
The monitor is calibrated over the measurement range against functional saturation SpO2 func.
PULSE RATE FROM PLETH
Measurement range 30 to 250 bpm
Accuracy 30 to 100, ±5 bpm,
100 to 250, ±5 %
Resolution 1 bpm
Display averaging 10 s

1
1 SD (standard deviation) = 68 % of all readings in the specified range in stable conditions.

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Adjustable pulse beep volume.

PLETH WAVEFORM
Scales 2, 5, 10, 20, 50 mod%, Auto
Start up scale is 20 mod% if AUTO is not selected to be the default setting.

1.2.4 Temperature
Measurement range 10 to 45 °C (50 to 113 °F)
(In rev. ESTP 03/ EST 02/ETP 02 or earlier: 15 to 45 °C (59 to 113 °F))
Measurement accuracy ±0.1 °C (25 to 45.0 °C)
±0.2 °C (10 to 24.9 °C)
Display resolution 0.1 °C (0.1 °F)
Temperature test automatic (every 10 min)
Probe type compatible with YSI 400 series

1.2.5 Invasive blood pressure

Measurement range -40 to 320 mmHg
Measurement accuracy ±2 mmHg or ±5 %
Zero adjustment range ±150 mmHg
Calibration range ±20 %
Scales upper limit is adjustable between 10 and 300 mmHg in steps of
10. Lower limit is 10 % of selected upper limit below zero.
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40 to 320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30 to 300 mmHg
PULSE RATE FROM ARTERIAL PRESSURE
Measurement range 30 to 250 bpm
Resolution 1 bpm
Accuracy ±5 bpm or ±5 % whichever is greater

1.2.6 Respiration
NOTE:The respiration measurement is intended for patients over three years old
Measurement range 4 to 120 bpm
Accuracy ±5 bpm or ±5 %
Resolution 1 bpm
Averaging time 30 s
Update interval 10 s
RESPIRATION WAVEFORM
Sweep Speeds 6.25 mm/s and 0.625 mm/s

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1.3 Technical specifications

1.3.1 NIBP
Deflation rate, PR dep. 5 to 13 mmHg/s
Inflation time 20 to 185 mmHg, 1 to 5 s
Automatic software control, max. inflation pressure
adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 150 ±10 mmHg
Over pressure limit, stops measurement after 2 seconds
adult 320 mmHg
child 220 mmHg
infant 165 mmHg
The safety valve limits the maximum cuff pressure to 320 mmHg in adult/child mode or 165 mmHg
in infant mode. Independent timing circuit limits pressurizing (>15 mmHg) time to 2 minutes 10
seconds maximum in adult/child mode, and 1 minute 5 seconds in infant mode.
Zeroing to ambient pressure is done automatically.
Inflation pressure is adjusted according to the previous systolic pressure, typically 40 mmHg
above. If the systolic pressure is not found, inflation pressure is increased typically 50 mmHg.
Max. measurement time adult 2 min
child 2 min
infant 1 min
Pressure transducer accuracy is better than ±3 mmHg or ±2 % whichever is greater.
Max. error ±4 mmHg.
Protection against electrical
shock Type BF defibrillation proof

1.3.2 ECG
Defibrillation protection 5000 V, 360 J
Recovery time 2s
Input impedance >2.5 MΩ (10 Hz)
CMRR >100 dB (ST)
System noise <40 µV (p-p, RTI)
Allowable offset ±300 mVDC
Gain range 0.2 to 5.0 cm/mV
Pacemaker pulse detection 2 to 500 mV, 0.5 to 2 ms pulses
Protection against electrical
shock Type CF defibrillator proof

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1.3.3 Pulse oximetry

Protection against electrical
shock Type BF defibrillation proof

1.3.4 Temperature
Measurement accuracy ±0.1 °C (25.0 to 45.0 °C)
±0.2 °C (10.0 to 24.9 °C)
Protection against electrical
shock Type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified, depending on
transducer/probe used. Please refer to the transducer/probe specification.

1.3.5 Invasive blood pressure

DIGITAL DISPLAY AVERAGING
Digital displays Art and P1 are averaged over 5 seconds and updated at 5 seconds intervals. All
other pressures have respiration artifact rejection.
Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and input sensitivity
5 µV/V/mmHg
Input voltage 5VDC
max current 20 mA
Filter 0 to 4 - 22 Hz adjustable
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time less than 15 s
Protection against electrical
shock Type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified, depending on
transducer/probe used. Please refer to the transducer/probe specification.

1.3.6 Respiration
Excitation frequency, 12-lead ECG 62.5 kHz
Excitation frequency, other modules 31.25 kHz
Breath detection automatic, range 0.3 to 6 Ω manually adjustable minimum
detection: 0.2, 0.4, 0.6, 0.8, 1.0
Input dynamic range 0.2 to 6 Ω
Input impedance range 100 to 5000 Ω
Respiration Rate min. 4 bpm
max. 120 bpm
Lead off detection >3 MΩ

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 NIBP
NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure.
The NIBP measurement is performed according to the oscillometric measuring principle. The cuff is
inflated with a pressure slightly higher than the presumed systolic pressure, and deflated at a
speed based on the patient’s pulse, collecting data from the oscillations caused by the pulsating
artery. Based on these oscillations, values for systolic, mean, and diastolic pressures are
calculated.
The following parts are necessary for the NIBP measurement:
• M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR (or M-NIBP) module
• twin hose (adult or infant model)
• blood pressure cuffs (various sizes)

2.1.2 ECG
Electrocardiography analyzes the electrical activity of the heart by measuring the electrical
potential produced with electrodes placed on the surface of the body.
ECG reflects:
• electrical activity of the heart
• normal/abnormal function of the heart
• effects of anesthesia on heart function
• effects of surgery on heart function
See the User's Guide or theUser's Reference Manual for electrodes positions and other
information.

2.1.3 Pulse oximetry

A pulse oximeter measures the light absorption of blood at two wavelengths, one in the near
infrared (about 900 nm) and the other in the red region (about 660 nm) of the light spectrum.
These wavelengths are emitted by LEDs in the SpO2 probe, the light is transmitted through
peripheral tissue and is finally detected by a PIN-diode opposite the LEDs in the probe. The pulse
oximeter derives the oxygen saturation (SpO2) using an empirically determined relationship
between the relative absorption at the two wavelengths and the arterial oxygen saturation SaO2.
In order to measure the arterial saturation accurately, pulse oximeters use the component of light
absorption giving variations synchronous with heart beat as primary information on the arterial
saturation.

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A general limitation of pulse oximetry is that due to the use of only two wavelengths only two
hemoglobin species can be discriminated by the measurement.
The modern pulse oximeters are empirically calibrated either against fractional saturation
SaO2frac;
HbO2
SaO2frac = Formula 1
HbO2 + Hb + Dyshemoglobin

or against functional saturation SaO2func;

HbO2
SaO2func = Formula 2
HbO2 + Hb

Functional saturation is more insensitive to changes of carboxyhemoglobin and methemoglobin

concentrations in blood.
The oxygen saturation percentage SpO2 measured by the Datex-Ohmeda module is calibrated
against functional saturation SaO2func. The advantage of this method is that the accuracy of SpO2
measurement relative to SaO2func can be maintained even at rather high concentrations of
carboxyhemoglobin in blood. Independent of the calibration method, pulse oximeters are not able
to correctly measure oxygen content of the arterial blood at elevated carboxyhemoglobin or
methemoglobin levels.

Plethysmographic pulse wave

The plethysmographic waveform is derived from the IR signal and reflects the blood pulsation at
the measuring site. Thus the amplitude of the waveform represents the perfusion.

Pulse rate
The pulse rate calculation is done by peak detection of the plethysmographic pulse wave. The
signals are filtered to reduce noise and checked to separate artifacts.

Probe
The standard probe is a finger clamp probe which contains the light source LEDs in one half and
the photodiode detector in the other half. Different kinds of probes are available from Datex-
Ohmeda.

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Intensity of
transmitted I max (DC-component)
light I max
AC-component
I min

Variable absorption
Transmitted
due to pulse added
light
volume of arterial
blood

Arterial blood

Venous blood

Tissue

Time
No pulsation Pulsatile blood

Incident light

SpO 2 sensor connector

SpO2 sensor cable

6
GND
Emitter 7 I LED
IRED
4
RED 5 GND
8 V
B
R C

Detector 1 IS
9
GND

Figure 2 Absorption of infrared light in the finger probe parts layout and schematic
diagram

2.1.4 Temperature
The temperature is measured by a probe whose resistance varies when the temperature changes,
called NTC (Negative Temperature Coefficient) resistor.
The resistance can be measured by two complementary methods:
• Applying a constant voltage across the resistor and measuring the current that flows
through it
• Applying a constant current through the resistor and measuring the voltage that is

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generated across it.

In Datex-Ohmeda modules the two methods are combined in the form of a voltage divider. The
NTC-resistor is connected in series with a normal resistor and a constant voltage is applied across
them. The temperature dependent voltage can be detected at the junction of the resistors, thus
producing the temperature signal from the patient. The signal is amplified by analog amplifiers and
further processed by digital electronics.

2.1.5 Invasive blood pressure

To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The transducer is placed at
the same level with the heart, and is electrically zeroed.
The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor
interprets the voltage signal so that pressure data and pressure waveforms can be displayed.

2.1.6 Respiration
Impedance respiration is measured across the thorax between ECG electrodes. The respiration
signal is made by supplying current between the electrodes and by measuring the differential
current from the electrodes. The signal measured is the impedance change caused by breathing.
From these impedance changes, respiration rate is calculated, and the respiration waveform is
displayed on the screen.

2.2 Main components

2.2.1 M-ESTPR/-ETPR/-ESTR modules

ECG
Lead

T1 P1
Start
Wedge

T2 P2

Zero
P1
ECG+
Resp SpO2

Zero
P2

Figure 3 Front panel of M-ESTPR

The M-ESTPR, M-ETPR, and M-ESTR modules contain two main PC boards, the STP board and the
ECG board. They work independently. Both of them have their own processor and software EPROM.
Some components on the boards are not used in ETPR and ESTR modules.
In the M-ESTPR module, additionally, there are two small boards, the SP input and the ECG input
boards, attached to the front panel of the module. The front panel has six connectors and four keys.

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The connectors are two for temperature measurement, two for invasive blood pressure
measurement, one for ECG, and one for SpO2 measurement. The keys are for ECG lead, Start
Wedge, P1 zero, and P2 zero.
In the M-ETPR module, there are two small boards, the ECG input board and the 2P input board
attached to the front panel of the module. The front panel has five connectors and four keys. The
connectors are two for temperature measurement, two for invasive blood pressure measurement,
and one for ECG measurement. The keys are for ECG lead, Start Wedge, P1 zero, and P2 zero.
In the M-ESTR module, there are two small boards: the S input board and the ECG input board,
attached to the front panel of the module. The front panel has four connectors and one key. The
connectors are two for temperature measurement, one for ECG, and one for SpO2 measurement.
The key is for ECG lead select.
NOTE: M-ESTP rev. 03, M-ETP rev. 02 and M-EST rev. 02 and all earlier revisions have separate T
and SP input boards.

2.2.2 M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR modules

Auto
On/Off
NIBP
P1

Start
Cancel
P2
T1 T2
Zero
ECG+ P1
Resp SpO2

Zero
P2

Figure 4 Front panel of M-NESTPR

The M-NESTPR, M-NETPR, and M-NESTR modules contain three main PC boards, the STP board,
the ECG board, and the NIBP board. They work independently. Each of these has their own
processor and software EPROM.
The M-NE12STPR, M-NE12TPR, and M-NE12STR contain three main PC boards, The STP board,
the ECG board and the NIBP board. They work independently. Each of them has their own
processor. The STP board and NIBP board have software EPROM. In the ECG board the software is
in flash memory. The STP and NIBP boards are the same as in M-NESTPR module but the ECG
board and ECG input board are different.
In the M-NESTPR module, there are two small boards, the SP input and the ECG input board
attached to the front panel of the module. The front panel has seven connectors and four keys. The
connectors are two for temperature measurement, two for invasive blood pressure measurement,
one for ECG, one for NIBP, and one for SpO2 measurement. The keys are for NIBP Auto On/Off,
NIBP Start/Cancel, P1 zero, and P2 zero. The structure of M-NE12STPR is similar except the ECG
board and ECG input board are different.
In the M-NETPR module, there are two small boards, the 2P input board and the ECG input board,
attached to the front panel of the module. The front panel has six connectors and four keys. The

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connectors are two for temperature measurement, two for invasive blood pressure measurement,
one for ECG, and one for NIBP. The keys are for Auto On/Off, Start/Cancel, P1 zero, and P2 zero.
The structure of M-NE12TPR is similar except the ECG board and ECG input board are different.
In the M-NESTR module, there are two small boards, the ECG input board and the S input board,
attached to the front panel of the module. The front panel has five connectors and two keys. The
connectors are two for temperature measurement, and one for SpO2 measurement, one for ECG,
and one for NIBP. The keys are for Auto On/Off, Start/Cancel. The structure of M-NE12STR is
similar except the ECG board and ECG input board are different.

2.2.3 NIBP board

Exhaust valve 1

Cuff
Bleed valve
Zero Exhaust Pump
Joining chamber
valve valve 2 and
Check valve Pump valve
M
driver

B1 B2 Pressure
Overpressure control
transducers
Watchdog
timer

AD- +15 VD
converter
Address bus
CPU
80C51FA
Power-up
reset
Address
decoder

NESTPR_NIBP_board_blck_dgrm.vsd
RS485
to/from module bus

interf.
Front Software
Address RAM EPROM panel
X1 control
Internal latch keys
EEPROM watchdog
(calibration
data)
Databus
Write protection switch

Figure 5 NIBP board functional block diagram

Pressure transducers
The NIBP board contains two pressure transducers. They are of piezoresistive type. One is used for
measuring the pressure of the blood pressure cuff and the pressure fluctuations caused by arterial
wall movement (B1). The other is used for detection of cuff hose type, cuff loose and cuff occlusion
situations etc. (B2). The transducers are internally temperature compensated. They are supplied by
a constant voltage and their output voltage changes up to 40 mV max. (50 kPa, 375 mmHg).

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Signal processing
Two signals from the pressure transducers are amplified and sent to the A/D converter. After the
converter, digitized signals are sent to the microprocessor for data processing. Before the
converter, one of the signals is used to adjust the offset to the pressure safety level.
The NIBP board is controlled with a 80C51FA microprocessor at 16 MHz oscillator frequency.

Memory
NIBP program memory (EPROM) size is 128k × 8. RAM size is 32k × 8 bit and it stores variable
values of the NIBP measurement. EEPROM is size 64 × 16 bit and is used to store the calibration
values for the pressure transducers, the pulse valve constants gained during measurements, the
PC board identification, and module serial number.

Software control
Software controls valves and pump. In addition to the individual on/off signals for each component
there is a common power switch for the valves and the pump that can be used at pump/valve
failures.
In addition to external RS485 reset line the microprocessor system is equipped with its own power-
up reset. See the section in the ECG board’s description: “RS485 communication”

Watchdog timer
The NIBP board is equipped with a software independent safety circuit to disconnect supply
voltages from the pump and the valves if the cuff has been pressurized longer than the preset time.
As soon as the cuff pressure rises over a specified pressure limit, timer starts counting. The timer is
adjusted to stop the pump and open the valves after 2 minutes 10 seconds in adult/child mode
and after 1 minute 5 seconds in infant mode.

Valves
Exhaust valves are used for emptying the cuff and the joining chamber after the measurement.
Exhaust valve 1 is also used as safety valve in infant mode. The valve opens at 165 mmHg. Exhaust
valve 2 is also used as safety valve in adult mode and opens at 320 mmHg.
The bleed valve is used for emptying the cuff during measurement. The zero valve is used for
connecting the pressure transducer B1 to open air.

Power supply section

All connections are established via 25-pin connector (D-type, female). The module needs +5 V,
±15 V, and +15 VD (dirty) power supply to operate. The pump and the valves use separate +15 VD
power line. The supply voltages are generated in the power supply section of the S/5 monitor. The
reference voltages ±5 Vref and +10 Vref are generated on the NIBP board.

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2.2.4 ECG board in 3-and 5-lead measurement

Patient signals are connected to overload protection circuits (resistors and gas-filled surge
arresters) and analog switches to instrumentation amplifiers. Then the signals are amplified by 480
and limited by slew rate. Then they are A/D-converted, analyzed and transferred to module bus in
digital form.

PATIENT

Overload protection
R L F C N
Defibrillation
detector
Analog switches Lead selection logic
controlled by ECG lead selection
signals from uP
uP

Resp
amplifier
Slew-rate Slew-rate Slew-rate Slew-rate 31 kHz
detector detector detector detector from uP
uP uP uP uP
HP HP HP HP
filter filter filter filter
uP uP uP uP
Sync. Rectifier
Anti- Anti- Anti- Anti-
alias alias alias alias

Amplifier

A/D

Micro-
Supply processor
voltages (uP)

Power Opto- Direct

coupler
NESTPR_ECG_brd_blck_dgrm.vsd
source ECG
ISOLATION
Power Opto- Direct
source coupler ECG

to STP Board

Figure 6 3- and 5- lead ECG board block diagram

Analog ECG section

The ECG cable is connected to connector pins E1 to E6 on the input board which contains an
overload protection circuit. Leads are connected to amplifiers via analog switches. States of the
switches depend on the cable type. Lead-off, noise and pacemaker are detected by a slew rate

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detector. Lower frequency is determined by high pass (HP) filter 0.5 Hz (monitor bandwidth) or
0.05 Hz (diagnostic or ST- bandwidth).

Respiration section
3-lead cable The analog switches control the current supply source of the impedance respiration measurement,
and the lead selection for the 3-lead cable can be seen from the following table:
Table 2 Lead selection and coding for the 3-lead cable

Selected lead Current source between Signal measured from

I R-L N
II R-N L
III L-N R

Position on IEC standard coding AAMI standard coding

body surface
right arm R = red RA = white
left arm L = yellow LA = black
left leg F = green LL = red

5-lead cable When the 5-lead cable is used, the current source is between L-F and the signal is measured from
the N, independently on the lead selection.
The respiration amplifier consist of the operational amplifiers, and the components around them.
There is an analog switch for controlling the gain of the first stage of the preamplifier. Synchronous
rectifier consists of the analog switches, which are used for detecting the respiration signal from 31
kHz amplitude modulated raw signal. The amplifier stage consists of the differential amplifier and
the last amplifier. The differential amplifier consists of the operational amplifiers and the
components around them. This stage is AC-coupled on both sides for minimising the offset
voltages. The last amplifier is used for amplifying the signal derived from differential amplifier
stage. The respiration signal is zeroed at the beginning of the measurement. Zeroing is also used
for fast recovering the measurement after the motion artefact. This is done in amplifier section.
NOTE: The respiration measurement is switched OFF for 20 seconds when defibrillation is detected
at the defibrillation detector.

Microprocessor section
Microprocessor contains RAM and EPROM memories. The processor uses external EEPROM
memory. The microprocessor’s internal 8-channel A/D-converter converts the ECG-signals to
digital form. See the section in ECG board’s description: “RS485 communication

Serial communication
Communication with the module bus is made through RXD and TXD pins. See the section in STP
board’s description: “Serial communication”.

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Isolated section
The patient isolation of ECG is 5 kV.
NOTE: The isolation has been changed from the earlier revisions.

WARNING Do not touch battery-operated monitor during defibrillation procedure.

See the “Isolated section” in STP board description.

Power supply section

See the “Power supply section” in STP board description.
There is a test connector (X20) on the board for voltages +5 VREF, +5 V, +12 V, GND and -12 V.

2.2.5 ECG board in 12-lead measurement

The 12-lead ECG measurement consists of the functions, which are shown in the figure 7. All
functions are located in the ECG board except the front panel connector and the ECG input board.

Front panel connector and

ECG input board

Input protection and filtering ECG preamplifiers

Respiration Respiration ECG amplifiers

and Pacer
impedance impedance detection
Baseline
amplifiers supply
restoration

ECG CPU

RS 485 Power NV memory

communication supply

Isolation Isolation

to STP board

Figure 7 12-lead ECG measurement block diagram

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Front panel connector and ECG input board

The connector for the 12-lead ECG cable is a green 12 pin Nicolay type connector. 3- or 5-lead
cables with blue connectors cannot be connected to this connector. The ECG input board contains
high voltage resistors and a connector for ECG board.

Input protection and filtering

The input protection is implemented with protection diodes, which are connected to analog power
supply voltage and ground. The input filtering for ECG measurement is done with discrete
components. The measured signal is AC-coupled for respiration measurement. The signal from the
respiration supply is AC coupled. There are also the overload protection diodes for respiration
measurement supply.

ECG preamplifiers
The buffer amplifiers are used for each lead except N/RL. The leads off detection is implemented
by measuring the level of the input buffer amplifiers with A/D converter of CPU. The ECG signals are
measured using differential amplifiers.

ECG amplifiers and baseline restoration

The function of the ECG amplifiers and baseline restoration is to amplify the signal and to restore
the baseline of the signal in the middle of the display after the change of the signal level e.g. after
the change of the DC offset voltage.

Pacer detection
Pacer detection has been made by using two slew rate detector circuits. The pacer detection
amplifiers have been realized at the front of the slew rate detectors independently from the ECG
measuring channels.

Respiration impedance supply

The 62.5 kHz sine wave generator is used as the respiration measurement signal supply. Analog
switches are used for connecting the sine wave to the ECG leads to be measured.

Respiration impedance amplifiers

Buffer amplifiers are used in respiration measurement. Analog switches are used for selecting the
measurement leads. There are also additional amplifiers for increasing the respiration signal gain.
Respiration is always measured between R and F, independently on the ECG lead selection.

ECG CPU
The CPU is a 16 bit H8/3048 single-chip microcomputer. It contains 128 kbytes of flash memory
and 4 kbytes of RAM. The clock frequency is 16 MHz.

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RS485 communication
The communication to the CPU board of the monitor uses RS485 protocol. The RS485 driver
circuits are optically isolated from the processor of the module. PWM signal is used for direct ECG
signal. Direct ECG signal is available from the X2 connector of the UPI board or from the PT module.

Power supply
The ECG board has a driver controlled half bridge switching power supply with 5 kV isolation. The
supply voltages have been regulated with linear regulators.

2.2.6 ECG filtering

The S/5 monitors have three ECG filtering modes:
MONITORING 0.5 to 30 Hz (with 50 Hz reject filter)
0.5 to 40 Hz (with 60 Hz reject filter)
DIAGNOSTIC 12-lead ECG 0.05 to 150 Hz
DIAGNOSTIC other modules 0.05 to 100 Hz
ST FILTER 0.05 to 30 Hz (with 50 Hz reject filter)
0.05 to 40 Hz (with 60 Hz reject filter)
The purpose of filtering is to reduce high frequency noise and low frequency (e.g. respiratory)
movement artifacts.
Monitor filter is used in normal monitoring. Diagnostic filter is used if more accurate diagnostic
information is needed. ST filter gives more accurate information of ST segment, but reduces high
frequency noise.
The high-pass filters 0.5 Hz and 0.05 Hz are done with hardware. The monitor sends a command to
the hemodynamic module determining which of the corner frequencies 0.5 Hz or 0.05 Hz is to be
used.
The 50 Hz and 60 Hz reject filters are both low-pass filters with zero at 50 Hz or 60 Hz
correspondingly and they are done with software. They are for the mains supply filtering. When
these filters are used, 3 dB value for low-pass filter is 30 Hz or 40 Hz.
In diagnostic mode the upper frequency is limited by hardware and the -3 dB frequency is 100 Hz
for 3 or 5 lead ECG measurement. For 12 lead ECG the upper frequency is 150 Hz and it is limited
by software.

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2.2.7 STP board

Patient connectors

TEMP INV PRESS POX pre-

measuring measuring amplifier
Front panel
keys unit unit

Pox LE Ds driver
POX
gain
control
Temp AD Press AD

m easur ing

m eas uring
Red

IR ed
AD-converter
- 8 chn
- 12 bit Pox AD

Serial device communication

Intensities
µprocessor unit
Module Non volatile
Power RAM internal 2K memory
external 16K bus
isolation data
EPROM 48K
section
RS communication
Reset

Isolation Opto
transformer Patient isolation isolation
NESTPR_STP_brd_blck_dgrm.vsd

Power
Power RS485 Driver
non-isolation reset RS485 Driver
for module for data
section reset

Power for Power for

module Communication Module reset Module data

Module bus connector or

connector to NIBP Board (NESTPR)

Figure 8 STP board block diagram

Microprocessor unit
An Intel 80C196KC-16 processor is used. There are external memories, an 8-bit data bus, a 16
MHz oscillator, an open collector reset, and a watchdog timer. Three A/D-converters within the
processor are used. The processor’s internal UART communicates with the CPU board.
High speed I/O is used to obtain pulse control sequence necessary for pulse oximetry
measurement. It gets its timing clock from the oscillator.

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Temperature measurement unit

The value of the NTC-resistor in the probe depends on the patient’s temperature. It is measured
with the following principle described below.
The temperature signal(s) is produced by voltage dividers, part of which is the patient probe (YSI
400-series thermistor). The output is amplified by the calibrated amplifier(s) whose offset voltage
makes its output spread on both sides of zero. A wider output range (measurement range) means
better resolution.

+5V reference
0 °C => 7K357
15 °C => 3K541
25 °C => 2K253
38 °C => 1K301

NESTPR_temp_meas_princ.vsd
45 °C => 984R1

A1
to AD
NTC converter

offset

Figure 9 Temperature measurement principle

Invasive blood pressure measurement unit

An isolated +5 V voltage is supplied to the pressure transducer. From the bridge connection a
differential voltage, which depends on pressure and supplied voltage, is calculated (see the
formula below).
Uout = Uin × pressure × 5 V, where Uin is 5 V
Þ Uout = 25 V × pressure [mmHg]
Pressure amplification is realized in the instrumentation amplifier. The gain of the amplifier is set so
that the level of the signal transferred to A/D converter stays within the measurement range even
when there are circumstantial offsets or offsets caused by the transducer. There is a filter before the
amplifier to attenuate high frequency disturbances.
Pressure
Vin transducer
Instrumentation
amplifier

Vout Input
Filter G
pressure_meas_principle.vsd

to A D converter

Figure 10 Pressure measurement principle

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Pulse oximetry measurement section

I=5-350mA IRed LED intensity
LED driving circuit adjustment

Red LED intensity

Level of LED current adjustment
measurement and
feedback circuit
Level of LED current indication (to CPU)

Probe
IR DC level

G =1/4096-1 G = 275
G =16 IRed AC signal
or 63

for NESTPR
Amplifier Two step G =18
Preamplifier Digitally controlled
Current - to - Voltage attenuator AC amplifier or 125
converter

Red AC signal
G =16
or 63

Red DC level

Figure 11 Pulse oximetry measurement block diagram

LED control signals

The processor sends pulse width modulated signals, IRED intensity and RED intensity, which are
converted to DC voltages and filtered. Using switches either RED or IRED intensity is sent to the
amplifier in LED driving circuit.

LED driving circuit

The voltage difference which corresponds to LED current, is measured by the differential amplifier
circuit and its output is sent back to the processor in 0 to 5 V level. There are feedback circuits from
LED current measurement and LED intensity control.
Background light is measured by picking up a sample from the signal. The sample is modified to 0
to 5 V level and sent to the processor.

Measured signal preamplification

The preamplifier is current-to-voltage converter with gain selection. A higher gain is used for
measuring thin tissue.

Digitally controlled amplifier

The D/A converter is a digitally controlled amplifier after which there is another constant amplifier.

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Red and infrared channel separation

Red and infrared channels are separated from each other by switches. An operational amplifier
functions as a buffer and after this the infrared DC signal is sent to the processor. A capacitor
separates theC signal from the DC and the AC signal is sent to the processor after amplification.
There is a switch to choose the amplification constant.

Serial communication

Serial communication between the module and the frame is done by an RS485 type bus whose
buffers get their supply voltage (+5 VDC) from the frame and in the isolation section get the supply
voltage (+5 V) from the isolated power supply.
The serial communication buffers are controlled by a Reset signal so that when the Reset is active,
the buffer does not transfer data.
Reset is also RS485 type and additionally, there is an auxiliary logic power reset, which keeps the
reset active for about 500 ms despite the state of reset in the module bus. Time constant
determines the power-up reset time. There are components to prevent the module from sending
data during reset. Data transmission rate is 500 kbps.
NIBP Board
Receive data
m o d u le p r o s e s s o r

Data

connector for STP board

RS485

module bus connector

Send data Driver NData
Receive data
Send data
send/receive send/receive
Reset
Reset in
RS485
Driver NReset in
Reset

STP Board
Receive data
m o d u le p r o s e s s o r

connector for ECG board

Data
connector for NIBP board

RS485
Driver
Send data NData
Receive data
Send data
send/receive Opto isolation send/receive
Reset
Reset in
Reset RS485
Driver
Isolation

NReset in
Patient

ECG Board
m o d u le p r o s e s s o r

connector for STP board

Receive data Receive data

Send data Send data
send/receive Opto isolation
send/receive
Reset Reset
Isolation
Patient

Figure 12 Serial communication and opto isolation of M-NESTPR/-NE12STPR

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STP Board
Receive data Data

connector for ECG board

RS485

Connector for ECG board

module processor

module bus connector

Driver
Send data NData
Receive data
Send data
send/receive Opto isolation send/receive
Reset
Reset in
Reset RS485
Driver
NReset in

isolation
ECG Board Patient

Connector for STP board

module processor

Receive data Receive dat

Send data Send data
send/receive Opto isolation
send/receive
Reset Reset
isolation
Patient

Figure 13 Serial communication and opto isolation of M-ESTPR

Isolated section

There are two opto isolators. The signal is processed on a logical high-low level even though the
outputs of the opto isolators are analog signals in the isolated section.
The reset line is an open collector type with a pull-up resistor. Thus the processor is able to use its
internal watch-dog function.

Power supply section

The isolated supply voltage of the module is developed from +15 Vdirty voltage from the Central
Unit. The power supply is a switched-mode circuit, where the FET transistor switch is controlled by
an oscillator using bipolar timer. The frequency of the oscillator is about 30 kHz and pulse ratio 50
%. Controlling the FET switch is slowed to suppress spurious interference.
A special pulse transformer is used in the circuit. In the secondary circuit normal linear regulators
are used except for +5 V (low drop type linear regulator).

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Figure 14 Module bus connector (X1) pin layout

Table 3 Module bus connector description

Pin No I/O Signal Note

1 I RESET_RS485
2 I -15 VDC ∗∗
3 I +15 VDIRTY
4 I +15 VDC ∗∗
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 Ground & Shield
8 I -RESET_RS485
9 I CTSB ∗
10 O RTSB ∗
11 I RXDB ∗
12 O TXDB ∗
13 Ground & Shield
14 I +32 VDIRTY ∗
15 I GroundDIRTY
16 I CTSC ∗
17 O RTSC ∗
18 I RXDC ∗
19 O TXDC ∗
20 ON/STANDBY ∗
21 O PWM_ECG
22 RXDD_RS232 ∗
23 TXDD_RS232 ∗
24 I +5 VDC
25 I +5 VDC
∗ = Not used
∗∗ = Used only by M-ESTPR, M-ETPR, M-ESTR and M-NIBP modules

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2.3.2 Front panel connectors

Table 4 Front panel connectors

12-lead ECG connector Temp connector (T1, T2)

1 8
2 9 7
10 12
3 11 6
4 5

Pin No Signal Pin No Signal

1 Right arm electrode (R) 1 Temperature probe
2 Left arm electrode (L) 2 Temperature probe
3 N
4 Left leg electrode (F)
5 Chest electrode (C1)
6 Chest electrode (C2)
7 Chest electrode (C3)
8 Chest electrode (C4)
9 Chest electrode (C5)
10 Chest electrode (C6)
11 Cable type
12 Ground

ECG connector (ECG) SpO2 connector (SpO2) Invasive blood pressure

connectors (P1, P2)

3 6 3 6 3 6
1 9 1 9 1 9
4 7 4 7 4 7
2 0 2 0 2 0
5 8 5 8 5 8

Pin No Signal Pin No Signal Pin No Signal

1 Right arm electrode (R) 1 Feedback resistor 1 Pressure +
2 Left arm electrode (L) 2 Ground 2 Pressure -
3 Right leg electrode (RL) 3 Not Connected 3 Polarisation - (ground)
4 Left leg electrode (F) 4 Cable shield + 4 Polarisation +
probe identification ground
5 Chest electrode (C) 5 Probe identification 5 Not connected
6 Cable shield 6 LED drive ground 6 Not connected
7 Not connected 7 LED drive current 7 Not connected
8 3/5 lead identification 8 Input signal current 8 Not connected
9 Lead connection check 9 Ground 9 Ground
10 Ground 10 Ground 10 Cable detection

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2.3.3 Test points on boards

12-lead ECG board

12-lead ECG board

X2 component side
10 non floating
1 gnd
6 +15 vDIRTY
8 +5 v
1

10 2

NESTPR_12-lead_ECG_board.vsd
1 X3
X4 9 1 floating
floating 1 GND
1 1 6 +5 Vanalog
2 +5 Vdig. X6 10 GND
floating
1 -5 V
2 +2.5 V

NIBP board
There are test pad blocks on solder side. X8 and X6 pads and voltages are:

10 o o o o o 2
nibp_text_conn_in_nestpr.vsd

X6
9 ooooo1 1 2
X6 X8 oo
X8 oo
X5
oo
X7
oo
8 7

X8 X6
Pin No Signal Pin No Signal
1 GND 1 GND
2 WD out 2 A1 output
3 reset 3 -5V
4 +5 V 4 +5 V ref
5 +15 V dirty 5 B1 out - (A1 input)
6 +15 V 6 B1 out +
7 -15 V 7 B2 out +
8 - 8 B2 out -
9 -
10 GND

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ECG and STP board

There are identical test pin blocks both on STP and ECG boards. Pins and voltages are as follows:

ESTPR
X11 pin 1 +5 Vref X11 X12
pin 2 +5 V
pin 3 +12 V
pin 4 Gnd
pin 5 -12 V
X12 pin 1 -5 V (STP board only)

NESTPR
X11 pin 1 +5 Vref X11 X12
pin 2 +5 V
pin 3 +7 V
pin 4 Gnd
pin 5 -7 V
X12 pin 1 -5 V (STP board only)

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the hemodynamic modules is limited to replacing faulty printed circuit boards or
mechanical parts. Faulty printed circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and repairs outlined in
this section. Unauthorized service may void warranty of the unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair, however, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the performed procedure should be signed in the
check form.

3.2.1 Recommended tools

Tool Order No. Notes
Patient simulator -
Pressure manometer -
Temperature test set 884515
3-lead ECG trunk cable
5-lead ECG cable
10-leadwire ECG cable
SpO2 finger probe OXY-F4-N or SAS-F4
InvBP transducer
Adult NIBP cuff & hose
Infant NIBP cuff & hose
Screwdriver

3.2.2 Recommended parts

Part Order No. Notes
NIBP pump filter 57142

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All modules
Detach the module box by removing the two screws from the back of the module. Be careful with
loose latch and spring pin for locking.
1. Check internal parts:
− screws are tightened properly
− cables are connected properly
− all IC’s that are on sockets are attached properly
− EMC covers are attached properly
− there are no loose objects inside the module

?
2. Check external parts:
− the front cover and the front panel sticker are intact
− all connectors are intact and are attached properly
− the module box, the latch and the spring pin are intact

?
3. Replace the NIBP pump filter in NE12STPR/NE12TPR/NE12STR/NESTPR/NETPR/NESTR
modules, if necessary.

?
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until the monitoring screen appears. Configure the monitor
screen so that all the needed parameters are shown, for example as follows:
Monitor Setup - Waveform Fields - Field 1 - ECG1
Field 2 - ECG2
Field 3 - P1
Field 4 - P2
Field 5 - Pleth
Field 6 - Resp
Digit Fields - Lower Field 2 - NIBP
Lower Field 3 - T1+T2

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4. Plug in the module. Check that it goes in smoothly and locks up properly

?
5. Check that the module is recognized, i.e. all needed parameter information, except invasive
blood pressure, starts to show on the screen.

?
Preset ECG, Respiration, InvBP and SpO2 measurement settings:
ECG - ECG Setup - Hr Source - Auto
Pacemaker - Show
Others - Resp Setup - Size - 1.0
Resp Rate Source - Auto
Measurement - On
Detection Limit - Auto
Invasive Pressures - P1 ‘Art’ Setup - Label - Art
P2 ‘Cvp’ Setup - Label - Cvp
Pulse Oximetry - Pleth Scale - Auto

ECG measurement
6. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) -

Service (password 26-23-8) - Parameters

Take down the information regarding module software by selecting Scroll Vers and turning
the ComWheel.

?
7. Enter the ESTP : ECG service menu:

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the ECG/RESP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ state all OK.

?
8. Check the front panel membrane key ECG Lead (not available in NE12STPR/NESTPR type
modules).
Press the key at least for two seconds. Check that the selected ECG lead is changing on the
screen and the state for ‘Button’ in the service menu.

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9. Check that the power frequency value has been set according to the current mains power
frequency. Change the setting by selecting Power Freq, if necessary.

?
10. @ M-ESTPR, M-ETPR , M-ESTR, M-NESTPR, M-NETPR and M-NESTR modules: connect a 5-
lead ECG cable to the module. Check that the ‘Cable type’ shows 5 lead. If it shows 3 lead,
make sure the used 5-lead ECG cable contains the necessary wiring for cable recognition
(pins 0, 8 and 9 connected together).

@ M-NE12STPR, M-NE12TPR and M-NE12STR modules: connect a 10-leadwire ECG cable

to the module. Connect limb lead electrodes and one electrode from the chest lead set to
the same potential. Check that the ‘Cable type’ shows 10 lead.

?
11. Connect a 3-lead ECG trunk cable without a lead set to the module. Check that the
message "Leads off" is displayed on the screen.

?
12. Check that all the electrodes show OFF in the service menu and the message ‘Leads Off’ is
shown on the screen.

Connect all the leads together, for example to a suitable screwdriver. Check that all the
electrodes show ON and the message ‘Asystole’ appears.

Disconnect one of the leads and check that the corresponding electrode in the service
menu shows OFF within 10 seconds from the disconnection, then reconnect the lead.
Check the rest of the leads using the same method.

NOTE: When the ground lead (black) is disconnected all the electrodes should show OFF.

NOTE: The ‘Asystole’ and ‘Different leads off’ messages are shown using certain priority, so
even one of the leads is disconnected, the lead related ‘Leads off’ message may not appear
onto the screen.

NOTE: When RA, LA or LL electrode is disconnected, all six V electrodes show OFF.

NOTE: With NESTPR/ESTPR type modules and 5 lead cable the state of V2, V3, V4, V5 and
V6 electrodes follow the state of the V electrode.

?
13. Connect the leads to a patient simulator.
The settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

ECG - BASE - BPM - 160

PACE - WAVE - NSR
Check that normal ECG waveform is shown, the HR -value is 160 (±5) and the ‘Pacer count’
-value is not increasing in the service menu. Check the lead selections by pressing

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the ECG Lead key on the module (not available in NE12STPR/NESTPR type modules).
ECG - PACE - WAVE - ASNC
Check that pacemaker spikes are shown on the ECG waveform, the ‘HR’ -value changes to
75 (±5) and the ‘Pacer count’ -value is increasing according to shown pacemaker spikes.

Set the pacemaker option off:

ECG - PACE - WAVE - NSR

?
Respiration measurement
13. Check that the ‘Resp Available’ and ‘RESP Measurement’ show both ON in the ESTP: ECG
service menu.

?
14. Check the respiration measurement with a patient simulator.

The settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

BASELINE IMPEDANCE -switch - 500

LEAD SELECT-switch - II/RL-LL

RESP - WAVE - NORM

RATE - 20
OHMS - 1.0
RATIO - 1/1
APNEA - OFF
SHIFT - OFF
Check that the RESP waveform is shown and the ‘RR’ -value is 20 (±5). Change the position
of the BASELINE IMPEDANCE -switch and check that appropriate RESP waveform and ‘RR’ -
value are shown again within 30 seconds.
RESP - APNEA - 32 S
Check that the monitor gives the APNEA -alarm.

NOTE: Make sure that only the ECG leads are connected to the simulator during the apnea -
test. If other cables are connected at the same time, the respiration signal from the
simulator may be disturbed, and therefore, the APNEA -alarm may not be activated.
NOTE: When you have ECG service menu open, spikes will appear on the respiration
waveform. These spikes represent the threshold level for detecting inspiration and
expiration.

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Temperature measurement
15. Enter the ESTP : STP service menu:

Parameters - ESTP : STP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the STP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.

?
16. Check that the ‘Cable’ and ‘Probe’ show OFF for both channels, T1 and T2, when no probes
are connected.

Connect a temperature test plug into the connector T1. Check that the ‘Cable’ and ‘Probe’
for T1 show ON and the corresponding temperature value appears onto the monitor screen.
Perform the same check also for the channel T2.

?
17. Check the temperature calibrations using temperature test plugs.
If the deviation on a temperature reading on the screen is more than 0.1 °C, calibrate the
temperature channels according to the instructions in the chapter 3.4.3 Temperature
calibration.

?
18. Activate the temperature test by selecting Temp Test from the menu and pressing the
ComWheel twice. When the message ‘Performing temp test’ disappears from the digit field,
check that no error messages appear and ‘Temp error’ shows OFF for both channels in the
service menu.

?
19. Check that the module configuration has been set correctly. The configuration in use is
shown beside the text ‘Configuration’ in the service menu and it can be either STP, ST or TP.
Change the configuration in the Calibrations menu, if necessary.

?
Invasive blood pressure measurement
20. Check the front panel membrane keys that are related to the InvBP or temperature
measurement.
Press each of the keys at least for one second. Check that the pressed key is identified, i.e.
one of the texts for ‘Buttons’ changes from OFF to ON in the service menu.

?
21. Check that the ‘Cable’ and ‘Probe’ for P1 show OFF. Plug a cable with an invasive blood
pressure transducer into the front panel connector P1 and check that the ‘Cable’ and

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‘Probe’ show ON and the corresponding pressure waveform appears onto the screen.

Perform the same check also for the InvBP channel P2.

?
22. Calibrate the InvBP channels P1 and P2 according to the instructions in the chapter 3.4.4.
Invasive pressure calibration

?
23. Check the InvBP channels with a patient simulator.

The settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

SENSITIVITY -switch - 5 µV/V/mmHg

ECG - BASE - BPM - 60 - BP - 1 - WAVE - ATM

2 - WAVE - ATM
Restore the normal monitoring screen by pressing the key Normal Screen.

Connect cables from the channels BP1 and BP2 to the module connectors P1 and P2. Zero
the InvBP channels by pressing the keys ZERO P1 and ZERO P2 on the module front panel.
BP - 1 - WAVE - ART
2 - WAVE - CVP
Check that appropriate InvBP waveforms are shown and the InvBP values are approximately
120/80 (±3 mmHg) for the channel P1 and 15/10 (±2 mmHg) for the channel P2.

Check that HR- value is calculated from P1 when ECG is not measured (ECG cable
disconnected).

?
SpO2 measurement
24. Check that the message ‘No probe’ is shown when no SpO2 sensor is connected to the
module. Connect a SpO2 finger probe to the module. Check that the message ‘Probe off’ is
shown when the probe is not connected to a finger.

?
25. Connect the SpO2 probe onto your finger. Check that the reading of
95-99 and SpO2 waveform appear. Check that HR- value is calculated from SpO2 when ECG
and InvBP (P1) are not measured.

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Non Invasive Blood Pressure measurement

26. Enter the NIBP module service menu:
Parameters - NIBP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the NIBP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.

?
27. Check the front panel membrane keys.

Select Buttons/Leds.

Press each of the two NIBP related membrane keys at least for one second. Check that the
pressed key is identified, i.e. the corresponding text changes from OFF to ON in the menu.

?
28. Check the pump and valves.

Highlight Pneumatics from the NIBP menu. Connect a pressure manometer to the NIBP
module cuff connector.

Select Start Pump and press the ComWheel. Check that the pump turns on and the
pressure inside the tubing system starts to increase. Stop the pump by pressing the
ComWheel again when the pressure reaches 280 mmHg.

Highlight Open Exh1. Press the ComWheel and check that the pressure inside the tubing
system starts to drop then press the ComWheel again. Check the other exhaust valve by the
same way by selecting Open Exh2 from the menu.
If necessary, turn the pump on again for a moment to increase the pressure inside the
tubing system.

Highlight Set Valve. Press the ComWheel and set the value under the text ‘Pulse Valve’ to
number 150 by turning the ComWheel. Press the ComWheel again and check that the
pressure inside the tubing system starts to drop. Finish the test by selecting Previous Menu.

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29. Check the NIBP tubing system for leakages.

Select Calibrations from the NIBP service menu.

Connect the pressure manometer to the NIBP module cuff connector. Start the active leak
test from the menu by pressing the ComWheel. The module pumps a pressure of about 265
mmHg and then the pump stops.
Wait for 15 seconds for the pressure to stabilize then check that the pressure does not drop
more than 6 mmHg per one minute. Release the pressure by pressing the ComWheel once
more.

?
30. Calibration check.

Recalibrate the NIBP measurement according to the instructions in the chapter 3.4
Adjustment and Calibration. Calibration,Remember to set the calibration protection back
on after the calibration.

Disconnect the pressure manometer. Select Calibrations and then highlight Calibration
Check. Press the ComWheel and take down the zero offset values for both pressure
transducers, B1 and B2. The values should be within ±10 mmHg.

Connect the pressure manometer to the cuff connector and check the calibration with
pressures 100 mmHg, 200 mmHg and 260 mmHg. The zero offset value must be added to
the displayed pressure value in order to determine the real pressure.

?
31. Check the watchdog timer activation pressure.

Select Pneumatics from the NIBP service menu.

Keep the pressure manometer connected to the cuff connector. Pump up the pressure very
slowly and note the value on the manometer when your hear a signal from the loudspeaker.
The pressure at where the watchdog timer should activate with an audible signal is
13 mmHg (11 to 15 mmHg). Adjust the limit with the trimmer on the NIBP board, if
necessary.

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32. Check the watchdog timer.

Select Watchdog from the NIBP service menu.

Check the watchdog timer in the adult mode. Activate the timer by highlighting Test ADULT
and then pressing the ComWheel. Check that the time beside the text ‘Watchdog Interval’
starts to run. Wait until you hear a signal from the loudspeaker and then check the time
again. The time from the adult test should fall within 120 to 140 seconds.

Check the watchdog timer also in the infant mode by first selecting Test INFANT from the
menu. The time from the infant test should fall within 60 to 70 seconds.

?
33. Check the safety valve.

Select Safety Valve from the NIBP service menu.

Keep the pressure manometer connected to the cuff connector.

NOTE: Make sure your pressure manometer can be used to measure pressures over 300
mmHg. If such a pressure manometer is not available, perform the check with an adult cuff
that is connected around some round object, for example a calibration gas bottle.

Highlight Start Test. Start the adult safety valve test by pressing the ComWheel. Wait until
the pump stops and the pressure is deflated. Check the pressure values ‘Max press’ and ‘2
s after stop’ for both transducers. All the values should be within 290 - 330 mmHg.

Highlight ADULT. Press the ComWheel and check that the text changes now to INFANT.
Select Start Test and wait until the pump stops and the pressure values on the screen have
been updated. Check that the values ‘Max press’ and ‘2 s after stop’ are all now within 154
to 165 mmHg.

Return to the normal monitoring mode by pressing Normal Screen.

?
34. Connect an adult NIBP cuff to the cuff connector and disconnect one of its hoses.
Start NIBP measurement by pressing the key Start/Cancel on the module and check that
the message ‘Cuff loose’ appears on the screen within 30 seconds.
Reconnect the hose and then bend it with your fingers. Restart the measurement and check
that the message ‘Cuff occlusion’ appears on the screen within 30 seconds.

?
Check that automatic inflation limits are in use:
NIBP - NIBP Setup - Inflation Limits - Auto - Previous Menu

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35. Connect the cuff onto your arm, highlight Start Ven.Stasis in the NIBP menu and press the
ComWheel. Check the module identifies the cuff, i.e. the text ‘Adult’ appears into the NIBP
digit field for a short moment.

Keep the pressure inside the cuff for about half a minute in order to find out that the cuff is
not leaking, then press the ComWheel again. Select Normal Screen.

?
36. Keep the cuff on your arm and perform one NIBP measurement. Check that the module
gives a reasonable measuring result.

?
37. Connect an infant cuff to cuff connector and wrap it around your fingers.
Start NIBP measurement and check that the module identifies the cuff, i.e. the text ‘Infant’
appears into the NIBP digit field. Cancel the measurement after the cuff identification.

?
All modules
38. Perform electrical safety check and leakage current test.

?
39. Check that the module functions normally after the performed electrical safety check.

?
40. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

3.3.1 M-ESTPR, M-ESTR, and M-ETPR modules

Disassemble the M-ESTPR/-ESTR/-ETPR module in the following way. See the exploded view of
the module in 6.1.1.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearwards and detach it from the main body. Be careful with
loose latch and spring pin for locking.
3. To detach the ECG board, remove four screws, disconnect the ribbon cable from the STP
board, and the ribbon cable from the front panel. Slide the board rearward to disconnect
the fixed 10-pin connector from the ECG input board.
4. To detach the STP board, remove two screws and disconnect the two connectors from the
SP input board. The T-input connector cables must be disconnected as well.

CAUTION When reassembling the module, make sure that all cables are reconnected
properly.

3.3.2 M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR modules

Disassemble the M-NE12STPR/-NE12STR/-NE12TPR/-NESTPR/-NESTR/-NETPR module in the
following way. See the exploded view of the module in 6.1.3.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearwards and detach it from the main body. Be careful with
loose latch and spring pin for locking.
3. To detach the ECG board, detach four screws, disconnect ribbon cable from the STP board
(supply voltage), and ribbon cable from the ECG input board.
4. When the ECG board is removed, the STP board can be detached by removing four screws,
disconnecting the cable from the membrane keypad, the cable from the temperature
connectors, and cables from the SP input board. Also disconnect the NIBP hoses and the
ribbon cable from the NIBP board.
5. When the ECG board and the STP board are removed, the NIBP board can be detached by
removing four screws. The joining chamber can be detached by removing three screws and
disconnecting the hoses from the pressure transducers and the pump. The pump can be
detached by removing two screws. If the filter for the air inlet of the pump is removed, it
must be replaced.

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3.4 Adjustments and calibrations

3.4.1 Pressure safety level detection “OFFSET”

Remove two screws at the rear of the module. Remove the module box. Connect first the service
cable (e.g. a long Gas Interface Cable) to the module connector inside the monitor frame and then
to the rear connector of the module. Turn the monitor on. Enter to the NIBP service menu and select
Pneumatics. Pump reference pressure 13 mmHg into the module.
Adjust the trimmer until AD5 signal sign changes from negative to positive. Re-check the
adjustement, then lock the trimmer with for example nail polish.

3.4.2 NIBP calibrations

The electronics of the NIBP pressure measurement is calibrated at the factory. Zeroing pressure is
automatically maintained by the processor. If the zero point of the pressure transducer drifts more
than specified, an error message is given and the NIBP board should be recalibrated or replaced.
Check the NIBP measurement, and recalibrate if necessary , once a year. The checking and
recalibrating can be done in the NIBP service menu.
The calibration of the primary pressure channel can also be checked from the NIBP setup menu
(NIBP - NIBP Setup - Calibration Check). In this case the auto zeroing is performed at start -
remove hose before entering to ensure atmospheric pressure to the pressure transducers - the
primary pressure is displayed. The zero-offset value should then be zero.
Check the intake air filter as part of the calibration check.. Change the filter if it is visibly dirty.

Calibration check
1. Enter Calibration menu.

2. Select Calibration Check and press the ComWheel.

3. Connect an external precision manometer to the module.

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4. Pump the following pressures to manometer and check the difference between the
manometer and monitor pressure display:
Table 5 NIBP calibration check pressures

Pressure Max. error Example

0 mmHg ±9 mmHg (=zero offset) -2
100 mmHg 100 + zero offset ±2 mmHg 98 ±2
200 mmHg 200 + zero offset ±3 mmHg 198 ±2

If the error of pressure channel B1 is larger than specified above, the module should be
recalibrated. The error of B2 is allowed to be even twice as large because it has no effect on blood
pressure measurement accuracy. However, we recommend recalibrating the module when the
error of B2 is larger than specified above to ensure best possible operation.

Calibration
1. Enter Calibration menu.
2. Remove hoses from front panel connector to enable proper zeroing.
3. Select Calibration. If it is not available, perform the steps A, B, and C.
NOTE: Do not pull out the NIBP module from the monitor frame. The module must be in the frame
during the whole procedure.
A. Turn the toggle switch at the bottom of the NIBP module to enable the calibration. Turn the
switch to the right by, for example, a sharp pencil. This enables menu selection Protection.
The message ‘Calibration switch ON!’ appears.
B. Select Protection OFF in the Calibration menu and press the ComWheel.
C. Return the toggle switch to the left. Menu selection Calibration is now enabled, and
Protection is disabled. When the calibration is enabled, a message ‘Calibration not
protected’ appears.
• Start Calibration by pressing the ComWheel. Messages ‘Zeroing’ and ‘Zeroed’ will appear in
the NIBP message field. After this a pressure bar will appear.
• Connect an external mercury manometer with pump to module through the both tubes of
the hose - both transducers B1 and B2 must be calibrated simultaneously. Pump up to a
pressure about 200 mmHg according to the manometer. Calibration is possible in the range
150 to 300 mmHg.
• Verify that both pressure values in the prompt field match the manometer reading. If not,
adjust by turning the ComWheel. When the values of the pressure bar and the manometer
are equal, press the ComWheel to confirm the calibration. The message ‘Calibrating’ will
appear onto the NIBP digit field. After a few seconds it is followed by ‘Calibrated’, which
means that the calibration has succeeded, and the new calibration data has been saved
into EEPROM.

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• NOTE! When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct (i.e. change the value for
example one step higher and then back one step lower). “Calibrated” text should appear in
the display. This ensures that the calibration procedure is correctly registered and stored by
the module.

− To set the protection on:

Turn the toggle switch to the right. Select Protection ON and push the ComWheel.
Then turn the toggle switch back to the left.
• Remove the module from the frame and plug it back again. Then perform Calibration check
(see the preceding page) to verify the new calibration.

3.4.3 Temperature calibration

NOTE: For the temperature calibration, separate, accurate test plugs (25 °C and 45 °C) are
needed. A test set of two plugs is available from Datex-Ohmeda, order code 884515.
Calibrate temperature when measured test values deviate more than ±0.1 °C, and always after
STP board replacement.
1. Enter ESTPR: STP service menu.
2. Enter Calibrations menu.
3. Press the protect button at the bottom of the module and choose OFF in protect mode.
Release the button.
4. Select Calibrate T1/Calibrate T2.
5. Insert calibration plug (25 °C) into T1/T2 connector.
6. Press the ComWheel.
7. Insert calibration plug (45 °C) into T1/T2 connector.
8. Press the ComWheel.
9. Press in the protect button at the bottom of the module and choose ON in protect mode.
Release the button.

3.4.4 Invasive pressure calibration

Calibrate invasive pressure when the pressure transducer (probe) is replaced with a different type
of transducer, and when STP board is replaced.
1. Enter ESTPR: the STP service menu.
(Monitor Setup, Install/Service (password 16-4-34), Service (password 26-23-8),
Parameters).
2. Enter Calibrations menu.
3. Connect a pressure transducer with a pressure manometer to the P1/P2 connector. Choose
Calibrate P1 or Calibrate P2. Leave the transducer to room air pressure.
4. Press the ComWheel to start zeroing.

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5. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
6. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel. A tolerance of ±1 mmHg is allowed.
7. The message ‘Calibrated’ will appear on the display.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

See also the User’s Reference Manual for more troubleshooting procedures.

4.1.1 NIBP
TROUBLE CAUSE TREATMENT
No NIBP value displayed NIBP not selected on screen. Check monitor setup.
NIBP menu fading No M-NE(12)STPR module, module Plug in the module.
not properly connected, or NIBP and
NE(12)STPR module connected at
the same time.
Artifacts-message Unsuccessful measurement due to
patient movement or shivering.
Weak pulsation-message Weak or unstable oscillation pulses Check patient condition and retry.
due to:
Check any leaks and retry.
• artifacts (accurate diastolic
Use proper size of cuff. Check
pressure difficult to measure)
attachment.
• marked arrhythmia
• marked drop in diastolic
pressure
• diastolic pressure difficult to
measure
• improper cuff position or
attachment
• too few pulses detected
• weak or unusual blood
circulation
• may give systolic value

Call service NIBP hardware error. See the description of the error message
Error X-message X = error number. code in 4.1.2, the causes and the
solutions listed in the next chapter.

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TROUBLE CAUSE TREATMENT

Cuff loose-message 1. Hose and/or cuff not connected. 1. Connect the hose and the cuff.
2. Hose and cuff connected. 2.
Reasons:
− cuff loosely wrapped − tighten the cuff
− leakage in cuff or hose − replace cuff/hose

− leakage inside module − check internal tubing and air

chamber, and fix if necessary
− pump does not work − check pump connector; if OK, replace
pump
− no pulses during the last three − check cuff positioning
measurements
Air leakage-message 1. Hose or cuff leaking. Reasons: 1. Replace cuff
− cuff damaged − replace cuff
− cuff connector damaged − replace cuff connector (if the fault is
in hose connector,)
− O-ring damaged or missing − replace O-ring

− hose double connector − replace hose

damaged
2. Hose and cuff OK. Reasons: 2. Connect or replace tube
− leakage inside the module − replace the whole tubing
− tube disconnected or damaged − fix connections

− air chamber leaking −

− tubes or valve(s) damaged − replace tubes/valve(s)

Unable to measure Sys- Systolic blood pressure probably Automatic retrial with increased
message higher than the maximum inflation pressure.
pressure.

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TROUBLE CAUSE TREATMENT

Cuff occlusion-message 1. Cuff and/or hose occluded. 1.
Reason:
− cuff tube kinked − straighten tube
− tube inside module kinked − straighten tube
− occlusion inside/outside − remove occlusion
module
2. Cuff, hose, and tubes OK. 2.
Reason:
− fault in pressure transducer − replace the NIBP board
− fault in A/D converter − replace the NIBP board
− faulty calibration − check calibration

− missing voltages − recalibrate

Calibration switch on - EEPROM protection switch at the Enables setting the protection OFF in the
message bottom of the module is turned to Calibration menu. Turn switch to left if you
right. are not going to calibrate.
Calibration not protected - Calibration protection is set to Set the protection ON in the NIBP
message. OFF. Calibration menu.

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4.1.2 NIBP error code explanation

Code Explanation Treatment
0 RAM failure; memory failure Change NIBP board.
1 ROM checksum error; memory failure Change NIBP board.
2 +15 V failure Check short circuits. Change NIBP
board.
3 -15 V failure Check short circuits. Change NIBP
board.
4 EEPROM protection switch error (only Turn the toggle switch to the left at the
with S-STD93) bottom of the module.
5 Calibration not protected. (only with S- Protect calibration by selecting
STD93) Protection ON in the NIBP calibration
menu.
6 ADC error ADC circuit failure. Change NIBP board.
7 Watchdog time too short Change NIBP board.
8 Watchdog time too long Change NIBP board.
9 Watchdog activated Change NIBP board.
10 EEPROM checksum error; memory failure Change NIBP board.
11 Auto zero range exceeded Calibrate NIBP.
12 Communication break; temporal break Automatic recovery
down of communication from monitor
detected
13 - -
14 Too early Auto Start (needs 25 seconds
without pressure)

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4.1.3 ECG
TROUBLE CAUSE TREATMENT
HR numerical display No heart rate available. If no ECG waveform, check LEADS OFF
shows ‘---’ message and connect the leads.

If ECG waveform exists, check heart

rate source e.g. in the ECG Setup
menu behind ECG key.
Unacceptable ECG waveform Poor electrode or poor electrode Electrodes from different
skin contact. manufacturers are used. /Too
much/little gel is used.
Poor electrode condition. Electrodes are dried out.
Improper site of electrodes. Check that electrodes are not placed
over bones, active muscles, or layers
of fat.
Improper skin preparation. Remove body hair. Clean attachment
site carefully with alcohol.
Improper bandwidth filter. Check filter.
No ECG trace Waveform not selected on screen. Press the Monitor Setup key and
make adjustments.
Module not plugged in correctly. Plug in.
Noise-message High frequency or 50/60 Hz noise. Isolate noise source.

4.1.4 Pulse oximetry (SpO2)

TROUBLE CAUSE TREATMENT
Message ‘NO PROBE’ No probe connected to the Check probe connections.
monitor.
Probe faulty. Change the probe.
Message ‘PROBE OFF’ though Unsuitable site. Try another site.
probe properly attached to the
patient
Probe faulty. Try another probe.
Probe connection cable not Connect the cable to probe.
connected to probe.
Finger probe falls off 1. Probe is slippery. 1. Wipe with 70 % isopropyl alcohol
and allow to dry.

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TROUBLE CAUSE TREATMENT

2. Finger is too thin or thick. 2. Try other fingers, or other probe
types.
Weak signal artifacts Poor perfusion. Try another place.
Movement artifacts.
Shivering.
Message ‘NO PULSE’ Pulse search > 20 sec. and low Try other fingers.
SpO2 or low pulse rate.
Message ‘ARTIFACT’ Pulse modulation exceeds the Try another place or another probe.
present scale.
Message ‘CHECK PROBE’ DC value not in balance. Try another probe.
Message ‘POOR SIGNAL’ Modulation (Red or Ired) < 0.25 % Patient may be cold.
Message ‘FAULTY PROBE’ Probe is faulty. Change the probe.
No SpO2 No waveform selected on screen. Check selected SpO2 waveforms by
pressing Monitor Setup key and
selecting Modify waveforms.
Wrong configuration setting. Check the configuration settings from
the ESTPR:STP/Calibrations menu
(Monitor Setup - Install/Service -
Service - Parameters)

4.1.5 Temperature
TROUBLE CAUSE TREATMENT
Message ‘TEMPERATURE ERROR’ Faulty calibration. Perform calibration. If it does not
help, check that front panel
connector is properly connected to
STP board.
No temperature displayed Wrong type of probe. Use correct probe.
Temperature out of measurable The range is between 10 and 45 °C.
range.
Temperature calibration not Set the protection ON in the Service
protected. Menu.

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4.1.6 Invasive blood pressure

TROUBLE CAUSE TREATMENT
Abnormally low pressure Transducer wrongly positioned. Check mid-heart level and reposition
transducer.
No pressure Defective transducer. Check transducer.
No pressure module plugged in. Check the module.
No waveform selected on screen. Check selected pressure waveforms
by pressing Monitor Setup key and
selecting modify waveforms.
Check that pressure transducer is
open to patient.
Wrong configuration setting Check the configuration setting from
the ESTP:STP/Calibrations menu
(Monitor Setup - Install/Service -
Service - Parameters)
Not zeroed -message Measurement on, channel not Zero the channel.
zeroed.
Zeroing failed -message Unsuccessful zeroing of P1 /P2 Possibly due to pulsating pressure
(number field). waveform. Open the transducer to air
and zero the channel.
Offset is > 150 mmHg. Open the
transducer to air and zero the
channel.
Defective transducer. Replace it and
zero the channel.
Calibration failed -message Unsuccessful calibrating of Turn the transducer to
P1/P2 (number field), possibly sphygmomanometer and try again
due to pulsating waveform (zeroing takes place first).
Gain is beyond the limits (± 20 % of
the default gain). Replace the
transducer.
Out of range < 40 mmHg Measurement pressure is beyond Check transducer level. Zero the
measurement range. channel.
Out of range > 320 mmHg Measurement pressure is beyond Check transducer level. Zero the
measurement range. channel. The patient may also have
high pressure.
Zero adj. > 100 mmHg Offset when zeroing is > 100 Check transducer. The waveform may
mmHg (but < 150 mmHg) from hit the top and the numeric display
the absolute zero of the module not shown.
(with default gain).

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TROUBLE CAUSE TREATMENT

Out of range Measured pressure is beyond the The waveform hits the top and the
internal measurement range of numeric display not shown. Check
the module. transducer and its level. Zero the
channel.

4.1.7 Impedance respiration

TROUBLE CAUSE TREATMENT
No resp trace Waveform not selected on the Press the Monitor Setup key and
screen make adjustments
Module not plugged in correctly Plug in
Unacceptable resp waveform Poor electrode or poor electrode Electrodes from different
skin contact manufacturers are used. Too
much/little gel is used.
Poor electrode condition Electrodes are dried out.
Improper site of electrodes Check that electrodes are not placed
over bones, active muscles, or layers
of fat.
Improper skin preparation Remove body hair. Clean
attachment site carefully with
alcohol.
Message: ‘SMALL RESP CURVE’ Respiration signal is very small With 3-lead cable in ESTPR/NESTPR
try another lead connection I, II, III or
try 5-lead cable.
Message: ‘APNEA ALARM’, and Respiration source is CO2 Check respiration source and
respiration waveform normal change it to correct one.

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4.2 Troubleshooting flowcharts

4.2.1 M-NE12STPR and M-NESTPR module troubleshooting

Possible faulty
START module with NIBP
parameter.

Remove all
Insert NXXX module
modules from
and turn power on.
Monitor Frame.
Replace
NXXX module.

Does fault NO Fault not in NO

still appear? NXXX module.

OK?
YES NO

Does
Module ID NO Check and
another module
work in same replace Check and
on screen? YES
slot? NIBP board. replace
NIBP board.
YES
NO

Error
message on OK?
NO
screen?
Key check Check keyboard
NO
YES in Service Menu connector. If OK,
OK? change front panel.
See error code explanation
in Service Manual and YES
fix it.
NESTPR_module_troubles_flowch.vsd

Pump check NO Check pump

in Service Menu connector. If OK,
Do OK? change pump.
they work?
YES

NO

Check tubes and Leak test YES

connectors. Find leak and in Service Menu
fix it. OK?

NO

Figure 15 M-NE12STPR and M-NESTPR module troubleshooting flowchart

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4.2.2 M-ESTPR, M-ESTR, and M-ETPR module troubleshooting

Possibly fault in module with
ESTPR parameters.

Check module configuration in

Service menu (ESTPR/STP/Calibrations)

Is it NO Select the correct

correct? configuration

YES
Remove all
modules from
the frame

Insert ESTPR module

and turn power on

Does fault NO Fault not in

still appear? ESTPR module

YES

Enter the Replace

Service menu STP board

NO
NO
Does
STP STP
NO another Remove

NESTPR_MESTPR_module_trou
module ID module ID
module work ECG board
on screen? in same YES on screen?
slot?
YES YES

Replace
bles_flowch.vsd

ECG ECG board

module ID
on screen? NO

YES
Check front panel
key functions in
Service menu

Has ECG NO NO Has invBP NO Has Temp NO Has SpO 2

Do YES Has STP
measurement measurement measurement measurement
they work? board failed?
failed? failed? failed? failed?

YES YES YES YES YES

NO

Check front panel unit, Replace Replace Replace Replace Replace

ECG board, and STP board ECG board STP board STP board STP board STP board
to find culprit. Replace if
necessary.

Figure 16 M-ESTPR Module Troubleshooting Flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters - NIBP.

NOTE: Parameter values in Service Data fields are for reference only on this chapter.

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5.1 NIBP service menu

Service Data
Pressure shows measured pressure multiplied by 10.
Zero shows pressure at auto zeroing multiplied by 10 and changes between +20 and -20 mmHg.
Absolute pressure is the sum of Pressure and Zero.

Protect handle indicates hardware protection for EEPROM memory. It should be ON all the time in
normal operation. If it is OFF data can not be read from or written to EEPROM, only the calibration
protection can be set or reset by software. It can be turned to OFF by turning the toggle switch to the
right at the bottom of the module, which also enables Protection ON/OFF menu selection in the
calibration menu.
Calibr. prot. shows software calibration protection and it should be OFF to enable calibration.

+15 V power indicates the condition of the supply voltage +15 Vdirty for the pump and valves. It
exists (ON) or not (OFF) depending on service menu function. The supply voltage can be turned on
by selecting the previous Menu and then the desired menu again.

AD0 to AD7 show the values of each eight channels of A/D converter.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum in the EPROM is in accordance with the one the software has
calculated.

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EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

5.1.1 NIBP demo menu

A service menu for demonstrating the oscillometric method of NIBP measurement. The menu
shows the realtime pressure signals that are measured from the NIBP cuff. The measurement result
is shown in the adjoining digit field.
Wave Recording Wave Recording is for selecting the recording option. If ON is selected, the pressure signals are
recorded in realtime onto the M-REC paper.
Remove menu Remove menu widens the displayed waveform area.
Previous Menu The menu can be closed by selecting the Previous Menu or just by pressing the ComWheel if the
Remove menu was selected.

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5.1.2 NIBP calibration menu

Active Leak Test Wrap an adult cuff around a pipe and connect the cuff to the module. Select the active leak test
(ON). The module automatically pumps a pressure of 260 mmHg into the cuff. Wait for several
seconds until the pressure stabilizes. Then check that the pressure reading does not drop more
than 6 mmHg per minute. If it does, leaking point(s) should be detected and fixed. Cancel the test
by selecting Active leak test OFF.
Calibration Check
After the calibration check is selected (ON), manually pump pressure into the module and make
sure that the same pressure values are shown both on the display and on manometer. Pressure of
both pressure channels B1 and B2 are shown. Note that if the display shows +2 mmHg at zero
pressure and if you pumped +200 mmHg into the module, the display should show +202 mmHg.
Protection Software calibration protection (ON/OFF). Select OFF when calibrating. Protection can be set to ON
or OFF only when the toggle switch at the bottom of the module is set to the right.
Calibration Calibration selection is available only when protection is OFF.
NIBP calibration can be performed in the NIBP Service menu as follows:
NOTE: Both channels B1 and B2 must be calibrated simultaneously.
1. If Protection is ON change it to OFF by first turning the toggle switch to the right at the
bottom of the module, which enables the Protection selection. Then turn the toggle switch
to the left to enable Calibration.
NOTE : Do not disconnect the module from the frame when turning the switch. The module must be
in the frame during the whole procedure.
NOTE: When the switch is at the right, the NIBP field shows an error message ‘Calibration switch
on!’.
NOTE: When calibration is enabled, a message ‘Calibration not protected’ appears.
2. For proper zeroing to take place, remove the hose from the front panel connector. Select
Calibration and push the ComWheel. Messages ‘Zeroing’ and ‘Zeroed’ will appear in the
NIBP message field. After this a pressure bar will appear beside the menu.

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3. Connect an external mercury manometer with pump to module through the both tubes of the
hose. Pump up to about 200 mmHg pressure (range of 150 to 300 mmHg allowed) according
to the manometer. Verify that both pressure values in the prompt field match the manometer
reading. If not, adjust by turning the ComWheel.
4. When the values are equal, push the ComWheel to confirm the calibration. First the message
‘Calibrating’ will appear in the digit fields for NIBP followed after a few seconds ‘Calibrated’,
which means that the calibration data has now been saved.
NOTE! When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct (i.e. change the value for example
one step higher and then back one step lower). “Calibrated” text should appear in the display.
This ensures that the calibration procedure is correctly registered and stored by the module.
5. Use the bottom switch to enable Protection setting and set it ON, and finally disable
Protection setting.

5.1.3 NIBP safety valve menu

Start Test Start test is for starting and Stop test is for stopping the Safety Valve test.

Safety Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Max. press and 2 s after stop show the measured values at Safety Valve test.
Safety Valve Test Adult/Infant
Wrap an adult cuff around a pipe and connect the cuff to the module. Highlight Start test and give
the ComWheel a push. The test ends automatically or when Stop test (appears in place of Start
test) is pushed.
Max. press indicates the pressure at which the safety valve opens and is normally 310 ±15 mmHg
for adult and 150 mmHg ±15 mmHg for infant. 2 s after stop indicates the pressure at 2 seconds
after the pump has stopped and is normally > 280 mmHg for adult and > 120 mmHg for infant. If
the value is less, check leakage by the active leak test.

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5.1.4 NIBP pulse valve menu

Start Test Start test is for starting and Stop test is for stopping the test.
Set Valve Set Valve lets you adjust the opening of the pulse valve.

Pulse Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.

Pulse Valve Checking

Wrap an adult cuff around a pipe and connect the cuff to the module. Select the Start test and
push the ComWheel. The pressure rises beyond 240 mmHg and stops. The pulse valve opens. The
module counts the time it takes for the pressure to go down from 240 mmHg to 50 mmHg and
displays it on the screen. The test can be manually stopped by selecting Stop test.
The valve can be adjusted between 0 and 255 (0 for fully closed and 255 for fully open). First
select Set Valve and push the ComWheel. See the pulse valve value and adjust it by turning the
ComWheel. Then push the ComWheel to confirm the value.
The ‘Interval 240 mmHg -> 50 mmHg’ time should be less than 60 seconds when the valve is
‘150’ and less than 10 when fully opened (255). When fully closed (0), the system should be
airtight and the pressure does not drop. Depending on an individual, the pulse valve may remain
closed up to approx. value 100.
If the measured time deviates much from those above, then the pulse valve or its tubes are faulty.

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5.1.5 NIBP buttons/leds menu

The selections Auto ON/OFF, Manual ON/OFF, STAT ON/OFF, and Measur. ON/OFF have no
effect on the module.

Buttons/Leds Data
See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Buttons Checking
The front panel keys function is confirmed by pressing the key and observing OFF turns to ON at
Auto On/Off, and Start Cancel.

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5.1.6 NIBP pneumatics menu

Start Pump/Stop Pump

A manual control for the pump. The selection changes to Stop Pump when the pump turns on.
Open Exh1/Close Exh1
A manual control for the exhaust valve 1. The selection changes to Close Exh1 when the valve is
opened.
Open Exh2/Close Exh2
A manual control for the exhaust valve 2. The selection changes to Close Exh2 when the valve is
opened.
Set Valve With Set Valve, the opening of the pulse valve is adjusted between 0 and 255 (0 for fully closed
and 255 for fully open). First push the ComWheel, then turn it to adjust the value on screen and
finally push to set the value.
Reset Clock Reset Clock will zero the time on the display.

Pneumatics Data field

See NIBP service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Pump, Exh1 Valve, and Exh2 Valve show their states.
Pulse Valve shows how much the valve is opened (0 to 255) during Valve Setting.
Interval 20 mmHg -> 185 mmHg Checking
Select the Start pump at different combinations of the valves open/closed and push the
ComWheel. The module counts the time it takes for the pressure to go up from 20 mmHg to 185
mmHg and displays it. When all the valves are closed, the pump should be able to pump the
pressure in about 1 to 4 seconds into an adult cuff wrapped around a pipe. The pump does not
stop without selecting the Stop Pump by pushing the ComWheel.

Watchdog BEEP
Connect manometer to the front panel and pump pressure into the module. When the AD5 value

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changes from negative to positive value (at about 13 mmHg) a beep is heard. This is the watchdog
threshold pressure. Beyond this pressure the watchdog is active and cut pressures at about 2 min.
(adult).

5.1.7 NIBP watchdog menu

Test ADULT Test ADULT is to test watchdog timer in adult mode (120 to 140 seconds).
Test INFANT Test INFANT is to test watchdog timer in infant mode (about 60 to 70 seconds).
Stop Test Stop Test is for stopping the test.

Watchdog Data field

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Watchdog Interval shows the time the +15 Vdirty stays on during the test.
Adult watchdog time testing
Select Test ADULT and push the ComWheel. Watchdog interval starts counting up seconds and
keeps on counting as long as the +15 Vdirty is on. The time should be 120 to 140 seconds.
Infant watchdog time testing
Select Test INFANT and push the ComWheel. Watchdog interval starts counting up seconds and
keeps on counting as long as the +15 Vdirty is on. The time should be 60 to 70 seconds.

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5.2 ECG service menu

Power freq Set power frequency; 50 Hz/60 Hz.

Filter low Set filter low frequency; 0.05 Hz/0.5 Hz.
Filter high Set filter high frequency; 30 Hz (40 Hz if power freq is 60 Hz) /100 Hz or 150 Hz @ NE12STPR.
Service Data field
Power freq, and Cable type show the values chosen or detected, Filter low and high defines the
selected filter (Monitor/Diagnostic/ST).

Quick zero @ NESTPR and ESTPR modules is ON when the signal in any of the three internal
amplifier goes beyond scale, and therefore, a capacitor connected to the related channel
discharges overvoltage. At least one of Quick zero values is OFF when 3-lead cable is used. All
three values are OFF when 5-lead cable is used. Quick zero also takes place when lead is changed
in 3-lead measurement. @ NE12STPR Quick zero is on if any of the ECG amplifiers goes beyond
the scale.

Cable shows ON when an ECG cable is connected.

Electrode shows ON when each of these electrodes are connected.

Pacer count is a running number for pacemaker users.

The front panel ECG key function is confirmed by pressing the key and observing OFF turns to ON at
Button.
NOTE: M-NE12STPR and M-NESTPR Module does not consist ECG key.
Resp Available indicates that ECG hardware is capable of measuring impedance respiration.
Measurement shows ON when the respiration measurement is on.
Amp zero shows ON when zeroing of the respiration amplifier takes place.
Waveform VALUE will be updated in one second interval.

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Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software
has calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.2.1 ECG setup menu

Filter Filters the ECG signal high frequency noise and slow respiratory artefacts.
Monit (monitor) filter is used in routine monitoring. It effectively filters the artefacts caused by the
electrosurgery unit and respiration.
Diagn (diagnostic) filter is used if more accurate information of the waveform is needed (e.g., of P-
wave or AV block). The diagnostic filter is more susceptible to both high frequencies and baseline
wander than monitor filter.
STfilt (ST filter) permits more accurate information of ST segment. It filters the high frequency
artefacts caused by electrosurgery unit but catches the slow changes in ST segment. The ST filter is
more susceptible to baseline wander than the monitor filter.
Pacemaker Selects how to display the pacing pulse of cardiac pacemaker. The selections are Show, Hide, ON
R and Sensit.
Hide, the pacing pulse is filtered away from ECG data.
Show, the pacer pulse is filtered away from ECG data but the pulse is displayed as a constant
height marker.
ON R, pacing pulses are not filtered away from ECG data. This improves ECG monitoring with A-V
pacemaker patients, as QRS complexes are counted even if the pacing pulse hits the QRS
complex. However, during asystole the monitor may count pacing pulses as heart beats.
Sensit selection uses a more sensitive pacemaker detection. Pacemaker spike is displayed on
ECG.

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5.3 STP service menu

Record Data Record Data prints out the shown service data and board information (id, serial number and sw id)
onto the recorder module, M-REC.
Temp Test Temp Test activates the automatic temperature test for the temperature channels T1 and T2. The
result from the test is shown in the service data field.
NOTE: The Temp Test needs to be selected twice before the test starts.
Service Data field
Gain is a coefficient to compensate gain error. Usually the values for P1 and P2 are between
17000 and 25000 and for T1 and T2 between 13000 and 14300. Zero indicates offset
compensation value of each parameter in A/D converter. Typically the values for P1 and P2 are
within ±1000 and for T1 and T2 between -150 and +300. Calibrate if zero and/or gain value is
outside the ranges.

Cable shows ON when a corresponding cable is connected to the front panel and Probe shows ON
when a corresponding probe is connected to the cable.

Under Value the measured numeric values are displayed simultaneously. Pressure values are real
time values and shown in mmHg. Temperature values are shown in degrees Celsius.
The front panel STP keys functions are confirmed by pressing each key and observing OFF turns to
ON at Button.
SpO2 shows measured beat-to-beat SpO2 value. Modpr is a modulation % that indicates AC/DC
ratio in the measured signal. Hr is a pulse rate calculated from every beat.

Cable and Probe can be either OFF or ON, and these indicate the state PROBE OFF.
Under them there is a message field for SpO2. It can be OK, PULSE SEARCH, NO PROBE, PROBE
OFF, NO PULSE, ARTEFACT, POOR SIGNAL, or CHECK PROBE.
Balance between leds is adjusted by changing the intensity of red/infrared. Intensity of infrared
(Ired int.) is in the range of 40 to 255 and red intensity (red int.)is in the range of 40 to 255.

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DC gain shows the gain of DC signal adjusted by the module.

IDC is the value of infrared signal.
RDC is the dc value of red signal.
AC gain is the gain of infrared and red ac signals. AC gain values can be 1 or 0. Value 1 means high
ac gain and 0 means low gain.
Pre gain is a preamplifier gain for infrared and red signals. Pre gain values can be 1 or 0. Value 1
means normal operation. Value 0 means that signal levels are very low and extra gain is taken into
use.
Temp error shows the status of the temperature test. No errors found shows the status (OFF) and
errors found (ON).

Protect key shows normally OFF but turns to ON when the button at the bottom of the module is
pressed.

Protect mode is normally ON. It turns to OFF when Protect is switched to OFF for the temperature
calibration in Calibration Menu.
Configuration shows the chosen module configuration: TP, ST, or STP.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software
has calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.3.1 STP calibration menu

Protection Protection for the configuration and temperature calibrations can be set ON and OFF only when
protect button at the bottom of the module is pressed.
Set Config The module configuration should be set according to the module type. The setting is possible only
when the protection is set OFF. The available selections are TP, ST or STP. The configuration setting
should be checked if the STP board is replaced.
Calibrate T1 / Calibrate T2
The functions are for calibrating the temperature channels T1 and T2. The calibrations are possible
only when the protection is set OFF. The temperature calibration requires accurate test plugs of
value 25 °C and 45 °C.
Calibration:
1. Select Calibrate T1/Calibrate T2
2. Insert the test plug 25 °C into the T1/T2 connector
3. Press the ComWheel
4. Insert the test plug 45 °C into the T1/T2 connector
5. Press the ComWheel
Calibrate P1/Calibrate P2
The functions are for calibrating the invasive blood pressure channels P1 and P2. The calibrations
require a pressure transducer (with an appropriate cable) and a pressure manometer.
1. Connect the pressure transducer with the pressure manometer to the P1/P2 connector.
Select Calibrate P1/Calibrate P2. Leave the transducer to room air pressure.
2. Press the ComWheel to start zeroing.
3. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
4. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel.

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6 SPARE PARTS

6.1 Spare parts list

6.1.1 M-ESTP rev. 01, M-ETP rev. 00, M-EST rev. 00

Figure 17 Exploded view of M-ESTP Module

Item Description Order No. Replaced by

1 Module box (wide) 886168
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front mask unit, M-EST (rev.00) 880946
5 Front mask unit, M-EST (rev.01-02) 882129
5 Front mask unit, M-EST (rev.03-04) 887155
5 Front mask unit, M-ESTP (rev. 01) 880337
5 Front mask unit, M-ESTP (rev.02-03) 882127
5 Front mask unit, M-ESTP (rev.04-05) 887153
5 Front mask unit, M-ESTPR (rev.03-04) 894161
5 Front mask unit, M-ESTR (rev.03-04) 894162
5 Front mask unit, M-ETP (rev.00) 880941
5 Front mask unit, M-ETP (rev.01-02) 882128
5 Front mask unit, M-ETP (rev.03-04) 887154
5 Front mask unit, M-ETPR (rev.03-04) 894163
6 PP board, M-PP, M-ESTPR 891442 8000801
6 STP board, M-ESTPR 8000801 8002575
6 STP board, M-ESTP (rev.01), M-P (rev.00-01) 880339

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Item Description Order No. Replaced by

6 STP board, M-ESTP (rev.03-05), M-P(rev.02) 882627
6 STP board, M-ESTPR 8002575
6 STP board (rev.02) 882130 882627
7 ECG board 884609 888956
7 ECG board, M-ESTP 888957
7 ECG board, M-ESTP (rev.03) 883119 888957
7 ECG board, M-ESTP (rev.04) 886748 888957
7 ECG board, M-ESTP(rev.01) 880338
7 ECG board,M-ESTP (rev.02) 882025 888957
7 ECG/RESP board, M-ESTPR (Rev.02) 888956
8 Membrane keypad 879374
10 Front Panel sticker, DA ; M-ESTPR (rev.01-03) 892207 898504
10 Front Panel sticker, DA ; M-ESTPR (rev.04) ; S/5 898504
10 Front Panel sticker, DA ; M-ESTR (rev.01-03) 892208 898565
10 Front Panel sticker, DA ; M-ESTR (rev.04) ; S/5 898565
10 Front Panel sticker, DA ; M-ETPR (rev.01-03) 892209 898578
10 Front Panel sticker, DA ; M-ETPR (rev.04) ; S/5 898578
10 Front Panel sticker, DE ; M-EST (rev.00) 880453
10 Front Panel sticker, DE ; M-EST (rev.01--) 881961
10 Front Panel sticker, DE ; M-ESTP (rev.01) 880552
10 Front Panel sticker, DE ; M-ESTP (rev.02--) 881955
10 Front Panel sticker, DE ; M-ESTPR (rev.04) ; S/5 898495
10 Front Panel sticker, DE ; M-ESTPR (rev.01-03) 886966 898495
10 Front Panel sticker, DE ; M-ESTR (rev.01-03) 886968 898556
10 Front Panel sticker, DE ; M-ESTR (rev.04) ; S/5 898556
10 Front Panel sticker, DE ; M-ETP (rev.00) 880560
10 Front Panel sticker, DE ; M-ETP (rev.01--) 881958
10 Front Panel sticker, DE ; M-ETPR (rev.01-03) 886967 898569
10 Front Panel sticker, DE ; M-ETPR (rev.04) ; S/5 898569
10 Front Panel sticker, EN ; M-EST (rev.00) 880138
10 Front Panel sticker, EN ; M-EST (rev.01--) 881959
10 Front Panel sticker, EN ; M-ESTP (rev.01) 879481
10 Front Panel sticker, EN ; M-ESTP (rev.02--) 881953
10 Front Panel sticker, EN ; M-ESTPR (rev.01-03) 886603 898494
10 Front Panel sticker, EN ; M-ESTPR (rev.04) ; S/5 898494
10 Front Panel sticker, EN ; M-ESTR (rev.01-03) 886605 898555
10 Front Panel sticker, EN ; M-ESTR (rev.04) ; S/5 898555
10 Front Panel sticker, EN ; M-ETP (rev.00) 880428
10 Front Panel sticker, EN ; M-ETP (rev.01--) 881956
10 Front Panel sticker, EN ; M-ETPR (rev.01-03) 886604 898568
10 Front Panel sticker, EN ; M-ETPR (rev.04) ; S/5 898568
10 Front Panel sticker, ES ; M-EST (rev.01--) 885044
10 Front Panel sticker, ES ; M-ESTP (rev.02--) 884200
10 Front Panel sticker, ES ; M-ESTPR (rev.01-03) 886943 898498
10 Front Panel sticker, ES ; M-ESTPR (rev.04) ; S/5 898498
10 Front Panel sticker, ES ; M-ESTR (rev.01-03) 886945 898559
10 Front Panel sticker, ES ; M-ESTR (rev.04) ; S/5 898559
10 Front Panel sticker, ES ; M-ETP (rev.01--) 885043

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Item Description Order No. Replaced by

10 Front Panel sticker, ES ; M-ETPR (rev.01-03) 886944 898572
10 Front Panel sticker, ES ; M-ETPR (rev.04) ; S/5 898572
10 Front Panel sticker, FI ; M-ESTPR (rev.01-03) 888868 898501
10 Front Panel sticker, FI ; M-ESTPR (rev.04) ; S/5 898501
10 Front Panel sticker, FI ; M-ESTR (rev.01-03) 888870 898562
10 Front Panel sticker, FI ; M-ESTR (rev.04) ; S/5 898562
10 Front Panel sticker, FI ; M-ETPR (rev.01-03) 888869 898575
10 Front Panel sticker, FI ; M-ETPR (rev.04) ; S/5 898575
10 Front Panel sticker, FR ; M-EST (rev.00) 880140
10 Front Panel sticker, FR ; M-EST (rev.01--) 881960
10 Front Panel sticker, FR ; M-ESTP (rev.01) 880158
10 Front Panel sticker, FR : M-ESTP (rev.02--) 881954
10 Front Panel sticker, FR ; M-ESTPR (rev.01-03) 886963 898496
10 Front Panel sticker, FR ; M-ESTPR (rev.04) ; S/5 898496
10 Front Panel sticker, FR ; M-ESTR (rev.01-03) 886964 898557
10 Front Panel sticker, FR ; M-ESTR (rev.04) ; S/5 898557
10 Front Panel sticker, FR ; M-ETP (rev.00) 880429
10 Front Panel sticker, FR ; M-ETP (rev.01--) 881957
10 Front Panel sticker, FR ; M-ETPR (rev.01-03) 886965 898570
10 Front Panel sticker, FR ; M-ETPR (rev.04) ; S/5 898570
10 Front Panel sticker, IT ; M-EST (rev.01--) 886755
10 Front Panel sticker, IT ; M-ESTP (rev.02--) 886753
10 Front Panel sticker, IT ; M-ESTPR (rev.01-03) 886925 898499
10 Front Panel sticker, IT ; M-ESTPR (rev.04) ; S/5 898499
10 Front Panel sticker, IT ; M-ESTR (rev.01-03) 886927 898560
10 Front Panel sticker, IT ; M-ESTR (rev.04) ; S/5 898560
10 Front Panel sticker, IT ; M-ETP (rev.01--) 886754
10 Front Panel sticker, IT ; M-ETPR (rev.01-03) 886926 898573
10 Front Panel sticker, IT ; M-ETPR (rev.04) ; S/5 898573
10 Front Panel sticker, JA ; M-ESTPR (rev.01-03) 888303 898505
10 Front Panel sticker, JA ; M-ESTPR (rev.04) ; S/5 898505
10 Front Panel sticker, JA ; M-ESTR (rev.01-03) 888304 898566
10 Front Panel sticker, JA ; M-ESTR (rev.04) ; S/5 898566
10 Front Panel sticker, JA ; M-ETPR (rev.01-03) 888305 898579
10 Front Panel sticker, JA ; M-ETPR (rev.04) ; S/5 898579
10 Front Panel sticker, NL ; M-EST (rev.01--) 886045
10 Front Panel sticker, NL ; M-ESTP (rev.02--) 886044
10 Front Panel sticker, NL ; M-ESTPR (rev.01-03) 886937 898497
10 Front Panel sticker, NL ; M-ESTPR (rev.04) ; S/5 898497
10 Front Panel sticker, NL ; M-ESTR (rev.01-03) 886939 898558
10 Front Panel sticker, NL ; M-ESTR (rev.04) ; S/5 898558
10 Front Panel sticker, NL ; M-ETP (rev.01--) 886046
10 Front Panel sticker, NL ; M-ETPR (rev.01-03) 886938 898571
10 Front Panel sticker, NL ; M-ETPR (rev.04) ; S/5 898571
10 Front Panel sticker, NO ; M-ESTPR (rev.01-03) 893554 898503
10 Front Panel sticker, NO ; M-ESTPR (rev.04) ; S/5 898503
10 Front Panel sticker, NO ; M-ESTR (rev.01-03) 893556 898564
10 Front Panel sticker, NO ; M-ESTR (rev.04) ; S/5 898564

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Item Description Order No. Replaced by

10 Front Panel sticker, NO ; M-ETPR (rev.01-03) 893555 898577
10 Front Panel sticker, NO ; M-ETPR (rev.04) ; S/5 898577
10 Front Panel sticker, PT ; M-ESTPR (rev.01-03) 895249 898500
10 Front Panel sticker, PT ; M-ESTPR (rev.04) ; S/5 898500
10 Front Panel sticker, PT ; M-ESTR (rev.01-03) 895250 898561
10 Front Panel sticker, PT ; M-ESTR (rev.04) ; S/5 898561
10 Front Panel sticker, PT ; M-ETPR (rev.01-03) 895251 898574
10 Front Panel sticker, PT ; M-ETPR (rev.04) ; S/5 898574
10 Front Panel sticker, SV ; M-EST (rev.01--) 885859
10 Front Panel sticker, SV ; M-ESTP (rev.02--) 885857
10 Front Panel sticker, SV ; M-ESTPR (rev.01-03) 886928 898502
10 Front Panel sticker, SV ; M-ESTPR (rev.04) ; S/5 898502
10 Front Panel sticker, SV ; M-ESTR (rev.01-03) 886930 898563
10 Front Panel sticker, SV ; M-ESTR (rev.04) ; S/5 898563
10 Front Panel sticker, SV ; M-ETP (rev.01--) 885856
10 Front Panel sticker, SV ; M-ETPR (rev.01-03) 886929 898576
10 Front Panel sticker, SV ; M-ETPR (rev.04) ; S/5 898576
11 Metal frame 879183
11 Metal frame 879184
13 Cross cylinder-head screw M3x6 61721
14 Cross cylinder-head scerw M3x12 628700
15 T-Input Board, M-ESTP (rev.02-03) 882090
15 T-Input connectors 887152
16 EMC cover 884099
17 EMC cover 886818

A front panel unit includes all the connectors and input boards.
NOTE: The STP board 882627 can be used as a replacement only with STP software 884342.
NOTE: The ECG board 888957 can be used as a replacement only with ECG software 883806.
NOTE: The STP board 891442 can be used as a replacement only with STP software 891401.
NOTE: The STP board 8000801 includes the STP software 8000717.
NOTE: The STP board 8002575 includes the STP software 8002573.

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6.1.2 M-NESTPR rev. 00, M-NETPR rev. 00, M-NESTR rev. 00

Figure 18 Exploded view of M-NESTPR Module

Item Description Order No. Replaced by

1 Module box (wide) 886168
2 Spring pin 879182
3 Latch for module box 879181
4 ECG/RESP board, M-NESTPR (rev.00) 889988
5 STP board M-NESTPR (rev.00) 890007 8000800
5 STP board M-NESTPR (rev.00) 890007 8002574
5 STP-board 8000800 8002574
5 STP-board, M-NE12STPR 8002574
6 EMC cover 884099
7 NIPB board, M-NESTPR (rev.00) 887520
NIBP board software 888237
8 EMC cover 892305
9 NIPB pump, M-NESTPR, M-NIBP (rev.04) 889993
10 EMC cover 892307
11 Air filter (NIBP) 57142
12 Check valve 58542
13 Damping chamber, M-NESTPR, M-NIBP (rev.04) 888240
14 Bleed valve, M-NESTPR, M-NIBP (rev.04) 58566
15 Magnetic valve 58562
16 NIBP Cuff connector 64654
17 T-Input connectors 887152

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Item Description Order No. Replaced by

18 ECG Input Board, M-NESTPR (rev.00) 889985
19 P Input Board, M-NESTPR (rev.00) 890834
19 SP Input Board, M-NESTPR (rev.00) 890006
19 SPO2 Input Board, M-NESTR (rev.00), M-MRIP (rev.00) 890833
20 Fitting plate 879510
23 Membrane keypad 888242
24 Front panel unit, M-NESTPR 888273
24 Front panel unit, M-NESTR 891748
24 Front panel unit, M-NETPR 891772
25 Metal frame 888230
26 Cross recess screw M3x8 black 616215
27 Cross cylinder-head screw M3x6 61721
27 Cross cylinder-head screw M3x6 61721
28 Cross cylinder-head scerw M3x12 628700
28 Cross cylinder-head scerw M3x12 628700
29 Front Panel sticker, DA ; M-NESTPR (rev.00) 892204 898429
29 Front Panel sticker, DA ; M-NESTPR (rev.01) ; S/5 898429
29 Front Panel sticker, DA ; M-NESTR (rev.00) 892205 898458
29 Front Panel sticker, DA ; M-NESTR (rev.01) ; S/5 898458
29 Front Panel sticker, DA ; M-NETPR (rev.00) 892206 898492
29 Front Panel sticker, DA ; M-NETPR (rev.01) ; S/5 898492
29 Front Panel sticker, DE ; M-NESTPR (rev.00) 891166 898420
29 Front Panel sticker, DE ; M-NESTPR (rev.01) ; S/5 898420
29 Front Panel sticker, DE ; M-NESTR (rev.00) 891671 898449
29 Front Panel sticker, DE ; M-NESTR (rev.01) ; S/5 898449
29 Front Panel sticker, DE ; M-NETPR (rev.00) 891678 898483
29 Front Panel sticker, DE ; M-NETPR (rev.01) ; S/5 898483
29 Front Panel sticker, EN ; M-NESTPR (rev.00) 889264 898419
29 Front Panel sticker, EN ; M-NESTPR (rev.01) ; S/5 898419
29 Front Panel sticker, EN ; M-NESTR (rev.00) 891456 898448
29 Front Panel sticker, EN ; M-NESTR (rev.01) ; S/5 898448
29 Front Panel sticker, EN ; M-NETPR (rev.00) 891457 898482
29 Front Panel sticker, EN ; M-NETPR (rev.01) ; S/5 898482
29 Front Panel sticker, ES ; M-NESTPR (rev.00) 891171 898423
29 Front Panel sticker, ES ; M-NESTPR (rev.01) ; S/5 898423
29 Front Panel sticker, ES ; M-NESTR (rev.00) 891674 898452
29 Front Panel sticker, ES ; M-NESTR (rev.01) ; S/5 898452
29 Front Panel sticker, ES ; M-NETPR (rev.00) 891681 898486
29 Front Panel sticker, ES ; M-NETPR (rev.01) ; S/5 898486
29 Front Panel sticker, FI ; M-NESTPR (rev.00) 891170 898426
29 Front Panel sticker, FI ; M-NESTPR (rev.01) ; S/5 898426
29 Front Panel sticker, FI ; M-NESTR (rev.00) 891676 898455
29 Front Panel sticker, FI ; M-NESTR (rev.01) ; S/5 898455
29 Front Panel sticker, FI ; M-NETPR (rev.00) 891683 898489
29 Front Panel sticker, FI ; M-NETPR (rev.01) ; S/5 898489
29 Front Panel sticker, FR ; M-NESTPR (rev.00) 891167 898421
29 Front Panel sticker, FR ; M-NESTPR (rev.01) ; S/5 898421
29 Front Panel sticker, FR ; M-NESTR (rev.00) 891672 898450

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Item Description Order No. Replaced by

29 Front Panel sticker, FR ; M-NESTR (rev.01) ; S/5 898450
29 Front Panel sticker, FR ; M-NETPR (rev.00) 891679 898484
29 Front Panel sticker, FR ; M-NETPR (rev.01) ; S/5 898484
29 Front Panel sticker, IT ; M-NESTPR (rev.00) 891172 898424
29 Front Panel sticker, IT ; M-NESTPR (rev.01) ; S/5 898424
29 Front Panel sticker, IT ; M-NESTR (rev.00) 891675 898453
29 Front Panel sticker, IT ; M-NESTR (rev.01) ; S/5 898453
29 Front Panel sticker, IT ; M-NETPR (rev.00) 891682 898487
29 Front Panel sticker, IT ; M-NETPR (rev.01) ; S/5 898487
29 Front Panel sticker, JA ; M-NESTPR (rev.00) 894963 898430
29 Front Panel sticker, JA ; M-NESTPR (rev.01) ; S/5 898430
29 Front Panel sticker, JA ; M-NESTR (rev.00) 894964 898459
29 Front Panel sticker, JA ; M-NESTR (rev.01) ; S/5 898459
29 Front Panel sticker, JA ; M-NETPR (rev.00) 894965 8000380
29 Front Panel Sticker, JA ; M-NETPR (rev.01) ; S/5 8000380
29 Front Panel sticker, NL ; M-NESTPR (rev.00) 891168 898422
29 Front Panel sticker, NL ; M-NESTPR (rev.01) ; S/5 898422
29 Front Panel sticker, NL ; M-NESTR (rev.00) 891673 898451
29 Front Panel sticker, NL ; M-NESTR (rev.01) ; S/5 898451
29 Front Panel sticker, NL ; M-NETPR (rev.00) 891680 898485
29 Front Panel sticker, NL ; M-NETPR (rev.01) ; S/5 898485
29 Front Panel sticker, NO ; M-NESTPR (rev.00) 893566 898428
29 Front Panel sticker, NO ; M-NESTPR (rev.01) ; S/5 898428
29 Front Panel sticker, NO ; M-NESTR (rev.00) 893568 898457
29 Front Panel sticker, NO ; M-NESTR (rev.01) ; S/5 898457
29 Front Panel sticker, NO ; M-NETPR (rev.00) 893567 898491
29 Front Panel sticker, NO ; M-NETPR (rev.01) ; S/5 898491
29 Front Panel sticker, PT ; M-NESTPR (rev.00) 895234 898425
29 Front Panel sticker, PT ; M-NESTPR (rev.01) ; S/5 898425
29 Front Panel sticker, PT ; M-NESTR (rev.00) 895235 898454
29 Front Panel sticker, PT ; M-NESTR (rev.01) ; S/5 898454
29 Front Panel sticker, PT ; M-NETPR (rev.00) 895236 898488
29 Front Panel sticker, PT ; M-NETPR (rev.01) ; S/5 898488
29 Front Panel sticker, SV ; M-NESTPR (rev.00) 891169 898427
29 Front Panel sticker, SV ; M-NESTPR (rev.01) ; S/5 898427
29 Front Panel sticker, SV ; M-NESTR (rev.00) 891677 898456
29 Front Panel sticker, SV ; M-NESTR (rev.01) ; S/5 898456
29 Front Panel sticker, SV ; M-NETPR (rev.00) 891684 898427
29 Front Panel sticker, SV ; M-NETPR (rev.01) ; S/5 898490
30 Flat cable, STP 890874
30 Flat cable, STP 890874
31 Flat cable, ECG 890876
32 Flat cable, M-PP 891573
A front panel unit includes all the connectors and input boards.
NOTE: The STP board 890007 can be used as a replacement only with STP software 891401.
NOTE: The STP board 8000800 includes the STP software 8000717.

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NOTE: The STP board 8002574 includes the STP software 8002573.

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6.1.3 M-NE12STPR rev. 00, M-NE12STR rev. 00, M-NE12TPR rev. 00

Figure 19 Exploded view of M-NE12STPR Module

Item Description Order No. Replaced by

1 Module box (wide) 886168
2 Spring pin 879182
3 Latch for module box 879181
4 12-LEAD ECG Board, M-NE12STPR 894284 8000995
4 12-LEAD ECG BOARD II, N-NE12STPR 8000995
5 STP board M-NESTPR (rev.00) 890007 8000800
5 STP board M-NESTPR (rev.00) 890007 8002574
5 STP-board 8000800 8002574
5 STP-board, M-NE12STPR 8002574
6 EMC cover 884099
7 NIPB board, M-NESTPR (rev.00) 887520
NIBP board software 888237
8 EMC cover 892305
9 NIPB pump, M-NESTPR, M-NIBP (rev.04) 889993
10 EMC cover 892307
11 Air filter (NIBP) 57142
13 Damping chamber, M-NESTPR, M-NIBP (rev.04) 888240
14 Bleed valve, M-NESTPR, M-NIBP (rev.04) 58566
15 Magnetic valve 58562
16 NIBP Cuff connector 64654

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Item Description Order No. Replaced by

17 T-Input connectors 887152
18 12-lead ECG Input Unit 896913
19 P Input Board, M-NESTPR (rev.00) 890834
19 SP Input Board, M-NESTPR (rev.00) 890006
19 SPO2 Input Board, M-NESTR (rev.00), M-MRIP (rev.00) 890833
20 Fitting plate 879510
23 Membrane keypad 888242
24 Front Mask Unit, M-NE12STPR 896910
24 Front Mask Unit, M-NE12STR 896911
24 Front Mask Unit, M-NE12TPR 896912
25 Metal frame 888230
26 Cross recess screw M3x8 black 616215
27 Cross cylinder-head screw M3x6 61721
27 Cross cylinder-head screw M3x6 61721
28 Cross cylinder-head scerw M3x12 628700
28 Cross cylinder-head scerw M3x12 628700
29 Front Panel sticker, DA ; M-NE12STPR (rev.00) 897718 898442
29 Front Panel sticker, DA ; M-NE12STPR (rev.01) ; S/5 898442
29 Front Panel sticker, DA ; M-NE12STR (rev.00) 897622 898470
29 Front Panel sticker, DA ; M-NE12STR (rev.01) ; S/5 898470
29 Front Panel sticker, DA ; M-NE12TPR (rev.00) 897655 898481
29 Front Panel sticker, DA ; M-NE12TPR (rev.01) ; S/5 898481
29 Front Panel sticker, DE ; M-NE12STPR (rev.00) 897709 898433
29 Front Panel sticker, DE ; M-NE12STPR (rev.01) ; S/5 898433
29 Front Panel sticker, DE ; M-NE12STR (rev.00) 897613 898461
29 Front Panel sticker, DE ; M-NE12STR (rev.01) ; S/5 898461
29 Front panel sticker, DE ; M-NE12TPR (rev.00) 897646 898472
29 Front Panel sticker, DE ; M-NE12TPR (rev.01) ; S/5 898472
29 Front Panel sticker, EN ; M-NE12STPR (rev.00) 896985 898432
29 Front Panel sticker, EN ; M-NE12STPR (rev.01) ; S/5 898432
29 Front Panel sticker, EN ; M-NE12STR (rev.00) 896986 898460
29 Front Panel sticker, EN ; M-NE12STR (rev.01) ; S/5 898460
29 Front Panel sticker, EN ; M-NE12TPR (rev.00) 896987 898471
29 Front Panel sticker, EN ; M-NE12TPR (rev.01) ; S/5 898471
29 Front Panel sticker, ES ; M-NE12STPR (rev.00) 897712 898436
29 Front Panel sticker, ES ; M-NE12STPR (rev.01) ; S/5 898436
29 Front Panel sticker, ES ; M-NE12STR (rev.00) 897616 898464
29 Front Panel sticker, ES ; M-NE12STR (rev.01) ; S/5 898464
29 Front Panel sticker, ES ; M-NE12TPR (rev.00) 897649 898475
29 Front Panel sticker, ES ; M-NE12TPR (rev.01) ; S/5 898475
29 Front Panel sticker, FI ; M-NE12STPR (rev.00) 897715 898439
29 Front Panel sticker, FI ; M-NE12STPR (rev.01) ; S/5 898439
29 Front Panel sticker, FI ; M-NE12STR (rev.00) 897619 898467
29 Front Panel sticker, FI ; M-NE12STR (rev.01) ; S/5 898467
29 Front Panel sticker, FI ; M-NE12TPR (rev.00) 897652 898478
29 Front Panel sticker, FI ; M-NE12TPR (rev.01) ; S/5 898478
29 Front Panel sticker, FR ; M-NE12STPR (rev.00) 897710 898434
29 Front Panel sticker, FR ; M-NE12STPR (rev.01) ; S/5 898434

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Item Description Order No. Replaced by

29 Front Panel sticker, FR ; M-NE12STR (rev.00) 897614 898462
29 Front Panel sticker, FR ; M-NE12STR (rev.01) ; S/5 898462
29 Front Panel sticker, FR ; M-NE12TPR (rev.00) 897647 898473
29 Front Panel sticker, FR ; M-NE12TPR (rev.01) ; S/5 898473
29 Front Panel sticker, IT ; M-NE12STPR (rev.00) 897713 898437
29 Front Panel sticker, IT ; M-NE12STPR (rev.01) ; S/5 898437
29 Front Panel sticker, IT ; M-NE12STR (rev.00) 897617 898465
29 Front Panel sticker, IT ; M-NE12STR (rev.01) ; S/5 898465
29 Front Panel sticker, IT ; M-NE12TPR (rev.00) 897650 898476
29 Front Panel sticker, IT ; M-NE12TPR (rev.01) ; S/5 898476
29 Front Panel sticker, JA ; M-NE12STPR (rev.00) 897719 8000377
29 Front Panel sticker, JA ; M-NE12STPR (rev.01) ; S/5 8000377
29 Front Panel sticker, JA ; M-NE12STR (rev.00) 897623 8000378
29 Front Panel sticker, JA ; M-NE12STR (rev.01) ; S/5 8000378
29 Front Panel sticker, JA ; M-NE12TPR (rev.00) 897656 8000379
29 Front Panel sticker, JA ; M-NE12TPR (rev.01) ; S/5 8000379
29 Front Panel sticker, NL ; M-NE12STPR (rev.00) 897711 898435
29 Front Panel sticker, NL ; M-NE12STPR (rev.01) ; S/5 898435
29 Front Panel sticker, NL ; M-NE12STR (rev.00) 897615 898463
29 Front Panel sticker, NL ; M-NE12STR (rev.01) ; S/5 898463
29 Front Panel sticker, NL ; M-NE12TPR (rev.00) 897648 898474
29 Front Panel sticker, NL ; M-NE12TPR (rev.01) ; S/5 898474
29 Front Panel sticker, NO ; M-NE12STPR (rev.00) 897717 898441
29 Front Panel sticker, NO ; M-NE12STPR (rev.01) ; S/5 898441
29 Front Panel sticker, NO ; M-NE12STR (rev.00) 897621 898469
29 Front Panel sticker, NO ; M-NE12STR (rev.01) ; S/5 898469
29 Front Panel sticker, NO ; M-NE12TPR (rev.00) 897654 898480
29 Front Panel sticker, NO ; M-NE12TPR (rev.01) ; S/5 898480
29 Front Panel sticker, PT ; M-NE12STPR (rev.00) 897714 898438
29 Front Panel sticker, PT ; M-NE12STPR (rev.01) ; S/5 898438
29 Front Panel sticker, PT ; M-NE12STR (rev.00) 897618 898466
29 Front Panel sticker, PT ; M-NE12STR (rev.01) ; S/5 898466
29 Front Panel sticker, PT ; M-NE12TPR (rev.00) 897651 898477
29 Front Panel sticker, PT ; M-NE12TPR (rev.01) ; S/5 898477
29 Front Panel sticker, SV ; M-NE12STPR (rev.00) 897716 898440
29 Front Panel sticker, SV ; M-NE12STPR (rev.01) ; S/5 898440
29 Front Panel sticker, SV ; M-NE12STR (rev.00) 897620 898468
29 Front Panel sticker, SV ; M-NE12STR (rev.01) ; S/5 898468
29 Front Panel sticker, SV ; M-NE12TPR (rev.00) 897653 898479
29 Front Panel sticker, SV ; M-NE12TPR (rev.01) ; S/5 898479
30 Flat cable, STP 890874
30 Flat cable, STP 890874
32 Flat cable, M-PP 891573
33 Cross cylinder head screw M3x4 61719

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 S/5 Hemodynamic modules

7 EARLIER REVISIONS
For service information on the earlier revisions, please refer to:

Module revision Manual Note!

ESTP Module revision 01 Service Manual p/n 880850
ETP Module revision 00 Service Manual p/n 880850
ESTP Module revision 02 Service Manual p/n 882580
ETP and EST Modules revision 01 Service Manual p/n 882580
ESTP Module revision 03-04, Technical Reference Manual Slot 896620-1. Main manual is 896 624.
and ETP and EST Modules revision 02-03
NE12STPR Module, M-NE12STPR (rev. 00)
NE12STR Module, M-NE12STR (rev. 00)
NE12TPR Module, M-NE12TPR (rev. 00)
NESTPR Module, M-NESTPR (rev. 00)
NESTR Module, M-NESTR (rev. 00)
NETPR Module, M-NETPR (rev. 00)
ESTPR Module, M-ESTPR (rev. 03)
ESTR Module, M-ESTR (rev. 03)
ETPR Module, M-ETPR (rev. 03)

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APPENDIX A

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 APPENDIX A, Service check form, S/5 NE12STPR, NESTPR, ESTPR modules

SERVICE CHECK FORM

DATEX-OHMEDA HEMODYNAMIC MODULES

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. NIBP pump filter 4. Installation

5. Recognition

Notes

ECG measurement S/N

6. Module software (serial numbers)
ECG/RESP
STP
NIBP
OK N.A. Fail OK N.A. Fail
7. Communication and 8. Membrane key
memories
9. Power frequency 10. Cable recognition

11. Lead detection 12. Test with patient

simulator
Notes

A-1(4)
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RESP measurement S/N

OK N.A. Fail OK N.A. Fail
13. RESP measurement 14. Test with patient
recognition simulator
Notes

TEMP measurement S/N

OK N.A. Fail OK N.A. Fail
15. Communication and 16. Temperature probe
memories detection
17. Calibration check 18. Temp test -function

19. Configuration
STP/ST/TP
Notes

InvBP measurement S/N

OK N.A. Fail OK N.A. Fail
20. Membrane keys 21. Cable and transducer
detection
22. Calibration 23. Test with patient
simulator
Notes

SpO2 measurement S/N

OK N.A. Fail OK N.A. Fail
24. SpO2 probe detection 25. Test measurement

Notes

A 2 (4)
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 APPENDIX A, Service Check Form, S/5 NE12STPR, NESTPR, ESTPR modules

NIBP measurement S/N

OK N.A. Fail OK N.A. Fail
26. Communication and 27. Membrane keys
memories
28. Pump and valves

29. Leak test ≤ 6 mmHg/min

30. Calibration check Measured B1 Measured B2 Allowed range
0 mmHg ± 9 mmHg
100 mmHg 100 + z.o. ± 2 mmHg
200 mmHg 200 + z.o. ± 3 mmHg
260 mmHg 260 + z.o. ± 4 mmHg
z.o. = zero offset at 0 mmHg pressure
31. Watchdog timer activation 11 to 15 mmHg
pressure
32. Watchdog timer

Adult 120 to 140 s

Infant 60 to 70 s
33. Safety valve functions
B1 B2 Allowed range
‘Max press’ ADULT 290 to 330 mmHg
‘2 s after stop’ ADULT 290 to 330 mmHg
‘Max press’ INFANT 154 to 165 mmHg
‘2 s after stop’ INFANT 154 to 165 mmHg
OK N.A. Fail OK N.A. Fail
34. Cuff related messages 35. Adult cuff detection

36. Test measurement 37.Infant cuff detection

Notes

A-3(4)
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All modules
OK N.A. Fail OK N.A. Fail
38. Electrical safety check 39. Functioning after
electrical safety check
40. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A 4 (4)
Document No. 8001008-6
 Datex-Ohmeda Compact Airway modules
S/5TM Compact Airway Module, M-CAiOVX (rev. 02)
S/5TM Compact Airway Module, M-CAiOV (rev. 04)
S/5TM Compact Airway Module, M-CAiO (rev. 03)
S/5TM Compact Airway Module, M-COVX (rev. 03)
S/5TM Compact Airway Module, M-COV (rev. 04)
S/5TM Compact Airway Module, M-CO (rev. 03)
S/5TM Compact Airway Module, M-C (rev. 02)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1009-5

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division,

Instrumentarium Corp.
P.O. Box 7550, Madison
P.O. Box 900, FIN-00031
WI 53707-7550, USA
DATEX-OHMEDA, FINLAND
Tel. 1-608-221-1551 Fax 1-608-222-9147
Tel. +358 10 394 11 Fax +358 9 146 3310
www.datex-ohmeda.com
www.us.datex-ohmeda.com  Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5 Compact Airway Modules
TABLE OF CONTENTS I
TABLE OF FIGURES III
INTRODUCTION 1
1 SPECIFICATIONS 2
1.1 General specifications ..........................................................................................................................2
1.2 Typical performance .............................................................................................................................2
1.2.1 CO2 .............................................................................................................................................2
1.2.2 O2................................................................................................................................................2
1.2.3 N2O .............................................................................................................................................2
1.2.4 Respiration Rate (RR) ...................................................................................................................3
1.2.5 Anesthetic Agents (AA) .................................................................................................................3
1.2.6 MAC ............................................................................................................................................3
1.3 Gas specifications ................................................................................................................................3
1.3.1 Normal conditions........................................................................................................................4
1.3.2 Conditions exceeding normal........................................................................................................4
1.4 Patient spirometry specifications...........................................................................................................5
1.4.1 Normal conditions........................................................................................................................5
1.4.2 Conditions exceeding normal........................................................................................................6
1.5 Gas exchange specifications.................................................................................................................6
1.5.1 VO2 and VCO2...............................................................................................................................6
1.5.2 RQ...............................................................................................................................................6
2 FUNCTIONAL DESCRIPTION 7
2.1 Measurement principle .........................................................................................................................7
2.1.1 CO2, N2O, and agent measurement ...............................................................................................7
2.1.2 O2 measurement ..........................................................................................................................9
2.1.3 Patient spirometry ........................................................................................................................9
2.1.4 Gas exchange measurement.......................................................................................................11
2.2 Main components...............................................................................................................................12
2.2.1 Gas sampling system .................................................................................................................12
2.2.2 TPX measuring unit .....................................................................................................................16
2.2.3 OM measuring unit .....................................................................................................................16
2.2.4 PVX measuring unit.....................................................................................................................17
2.2.5 Gas exchange ............................................................................................................................18
2.2.6 CPU board .................................................................................................................................18
2.2.7 OM board ..................................................................................................................................19
2.2.8 PVX board ..................................................................................................................................19
2.3 Connectors and signals.......................................................................................................................20
3 SERVICE PROCEDURES 21
3.1 General service information ................................................................................................................21
3.1.1 OM measuring unit .....................................................................................................................21
3.1.2 TPX measuring unit .....................................................................................................................21
3.1.3 OM, TPX, and PVX measuring unit................................................................................................21

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3.1.4 Serviceable or exchangeable parts .............................................................................................21

3.2 Service check.....................................................................................................................................22
3.2.1 Recommended tools..................................................................................................................22
3.2.2 Recommended parts..................................................................................................................22
3.3 Disassembly and reassembly .............................................................................................................30
3.3.1 PVX unit.....................................................................................................................................30
3.3.2 Pump unit..................................................................................................................................30
3.3.3 CPU board .................................................................................................................................30
3.3.4 Software of CPU board ...............................................................................................................31
3.3.5 Instructions after replacing software or CPU board .......................................................................31
3.4 Adjustments and calibrations .............................................................................................................31
3.4.1 Gas sampling system adjustment ...............................................................................................31
3.4.2 Flow rate measurement..............................................................................................................31
3.4.3 Flow rate adjustment..................................................................................................................32
3.4.4 Gas calibration ..........................................................................................................................32
3.4.5 Flow calibration .........................................................................................................................32
4 TROUBLESHOOTING 33
4.1 Troubleshooting charts .......................................................................................................................33
4.1.1 CO2 measurement......................................................................................................................34
4.1.2 Patient spirometry......................................................................................................................35
4.1.3 Gas exchange ............................................................................................................................37
4.2 Gas sampling system troubleshooting .................................................................................................38
4.2.1 Sampling system leak test..........................................................................................................38
TM
4.2.2 Steam test for the Nafion tubes................................................................................................38
4.3 OM measuring unit troubleshooting.....................................................................................................38
4.4 TPX measuring unit troubleshooting.....................................................................................................39
4.5 PVX measuring unit troubleshooting ....................................................................................................39
4.5.1 Spirometry tubing leak test.........................................................................................................39
4.6 CPU board troubleshooting .................................................................................................................39
4.7 Error messages ..................................................................................................................................39
5 SERVICE MENU 41
5.1 General menu ....................................................................................................................................42
5.2 Gases service menu ...........................................................................................................................43
5.3 Spirometry service menu ....................................................................................................................45
6 SPARE PARTS 47
6.1 Spare parts list...................................................................................................................................47
6.1.1 M-C rev. 00, M-CO rev. 00..........................................................................................................48
6.1.2 M-C rev. 01-02, M-CO rev. 01-03...............................................................................................50
6.1.3 M-CAiO rev. 00, M-CAiOV rev. 01................................................................................................52
6.1.4 M-CAiO rev. 01-03, M-CAiOV rev. 02-04, M-CAiOVX rev. 00-02 ...................................................54
6.1.5 M-COV rev. 01, M-COVX rev. 00 ..................................................................................................57
6.1.6 M-COV rev 02-04, MCOVX rev. 01-03 .........................................................................................59
6.1.7 D-fend latch ..............................................................................................................................61
7 EARLIER REVISIONS 62
APPENDIX A 63
SERVICE CHECK FORM A-1

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 Table of contents

TABLE OF FIGURES
Figure 1 TPX sensor principle..............................................................................................................................7
Figure 2 Absorbance of N2O and CO2 ..................................................................................................................8
Figure 3 Infrared absorbance of AAs ...................................................................................................................8
Figure 4 O2 measurement principle ....................................................................................................................9
Figure 5 Absorber ............................................................................................................................................13
Figure 6 Gas sampling system layout, M-C........................................................................................................14
Figure 7 Gas sampling system layout, M-CAiOV, M-CAiOVX, M-CAiO, M-COVX, M-COV, M-CO..............................15
Figure 8 Gas tubing layout ...............................................................................................................................15
Figure 9 TPX measuring unit .............................................................................................................................16
Figure 10 OM measuring unit .........................................................................................................................17
Figure 11 PVX measuring unit.........................................................................................................................17
Figure 12 Signal processing...........................................................................................................................18
Figure 13 Control logic...................................................................................................................................19
Figure 14 Calibration data stored in EEPROM..................................................................................................19
Figure 15 Module bus connector pin layout ....................................................................................................20
Figure 16 Pneumatic unit and reference gas connection block.........................................................................24
Figure 17 Front panel stickers ........................................................................................................................47
Figure 18 Exploded view, M-C rev.00, M-CO rev.00, M-CaiO rev.00, M-COV rev. 01, M-CaiOV rev.01, M-COVX
rev.00 48
Figure 19 Exploded view M-C rev. 01-02, M-CO rev. 01-02, M-COV rev.02, M-COVX rev.01, M-CAiO rev.01, M-
CAiOV rev. 02, M-CAiOVX rev.00 ..................................................................................................................50
Figure 20 Exploded view, M-C rev.00, M-CO rev.00, M-CAiO rev.00, M-COV rev. 01, M-CAiOV rev.01, M-COVX
rev.00 52
Figure 21 Exploded view M-C rev. 01-02, M-CO rev. 01-02, M-COV rev.02, M-COVX rev.01, M-CAiO rev.01, M-
CAiOV rev. 02, M-CAiOVX rev.00 ..................................................................................................................54
Figure 22 Exploded view, M-C rev.00, M-CO rev.00, M-CAiO rev.00, M-COV rev. 01, M-CAiOV rev.01, M-COVX
rev.00 57
Figure 23 Exploded view M-C rev. 01-02, M-CO rev. 01-02, M-COV rev.02, M-COVX rev.01, M-CAiO rev.01, M-
CAiOV rev. 02, M-CAiOVX rev.00 ..................................................................................................................59
Figure 24 D-fend latch...................................................................................................................................61

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 Compact Airway modules

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Compact Airway modules. The Compact Airway modules are double width
plug-in modules. M-C, M-CO, M-COV, M-COVX, M-CAiO, M-CAiOV, M-CAiOVX and M-
CAiOVX/SERVICE are designed for use with the S/5 monitors. Later in this manual modules may be
refered to without the S/5 system nomenclature for simplicity.
Please also see theTechnical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
The Compact Airway modules provide airway and respiratory measurements.
Letters in the module name stand for:
M = plug-in module, C = CO2 and N2O, O = patient O2, V = patient spirometry, X = gas exchange,
A = anesthetic agents, and i = agent identification
About M-CAiOVX/SERVICE module
The M-CAiOVX/SERVICE module is meant for service purposes only. It can be used as a loan
module if the module in the hospital should be sent to the factory for repair. The specifications that
apply to the M-CAiOVX apply also to the M-CAiOVX/SERVICE module. Module differences: the
colour of the front mask is green, the front panel has a “SERVICE” text and there are no front panel
keys equipped.
Table 1 Options for Compact Airway modules

Modules Parameters/measurements
CO2 N2O O2 Anesthetic Agent ID Spirometry Gas
agents exchange
M-CAiOVX • • • • • • •
M-CAiOV • • • • • •
M-CAiO • • • • •
M-COV • • • •
M-COVX • • • • •
M-CO • • •
M-C • •
M-CAiOVX/SERVICE • • • • • • •

NOTE: Do not use identical modules in the same monitor simultaneously. The M-C, M-CO, M-COV,
M-COVX, M-CAiO, M-CAiOV, M-CAiOVX , M-CAiOVX/SERVICE and M-miniC are considered identical
modules.
NOTE: The Compact Airway Module or Single-width Airway Module and Airway Module, G-XXXX,
cannot be used simultaneously in the same monitor.
NOTE: The Compact Airway modules cannot be used in the Extension Frame, F-EXT4.
NOTE: Anesthetic agents and N2O values are not displayed with Critical Care main software, but
when present in the module they are calculated for compensation of CO2 and O2.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 75 × 228 × 112 mm, 2.9 × 9.0 × 4.4 in
Module weight 1.6 kg/3.7 lbs
Operating temperature +10...+40 °C
Storage temperature -25...+70 °C
Atmospheric pressure 666...1060 hPa /
(67...106 kPa)
(500...800 mmHg)
(666...1060 mbar)
Humidity 10...95 % non-condensing (in airway 0...100 %, condensing)
Power consumption 12.6 W Prms, 14.6 W momentary
Protection against electrical shock
Type BF

1.2 Typical performance

1.2.1 CO2
Measurement range 0...15 vol% (0...15 kPa, 0...113 mmHg)
Measurement rise time < 400 ms typical
Accuracy ±(0.2 vol% +2 % of reading)
Gas cross effects < 0.2 vol% (O2, N2O, anesthetic agents)
If CO2 concentration is below 0.1%, 0.0% is displayed.

1.2.2 O2
Measurement range 0 to 100 vol%
Measurement rise time < 400 ms typically
Accuracy ±(1 vol% +2% of reading)
Gas cross effects < 1 vol%; anesthetic agents
< 2 vol%; N2O
O2 Fi-Et difference resolution 0.1 vol%

1.2.3 N2O
Measurement range 0 to 100 %; N2O
Measurement rise time < 450 ms typically
Accuracy ±(2 vol% +2% of reading)
Gas cross effects < 2 vol%; anesthetic agents

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1.2.4 Respiration Rate (RR)

Measurement range 4...60 breaths/min
Detection criteria 1 % variation in CO2

1.2.5 Anesthetic Agents (AA)

Measuring range
Hal, Enf, Iso 0 to 6 vol%
Sev 0 to 8 vol%
Des 0 to 20 vol%
Measurement rise time < 400 ms typically
Accuracy ±(0.15 vol% +5% of reading)
Gas cross effects < 0.15 vol% N2O
Resolution is two digits when the AA concentration is below 1.0 vol%.
If AA concentration is below 0.1 vol%, 0.0% is displayed.
Identification threshold 0.15 vol% typically
Identification time < 20 s (for pure agents)
Mixture identification threshold for 2. agent:
0.2 vol% +10% of total conc.

1.2.6 MAC
Range 0...9.9 MAC
Equation:
%(ETAA) %ETN2O
MAC(AA) = + Formula 1
x(AA) 100

where x(AA): Hal=0.75 %, Enf=1.7 %, Iso=1.15 %, Sev=2.05 %, Des=6.0 %.

1.3 Gas specifications

Airway humidity 0...100 %, condensing
Sampling rate 200 ±20 ml/min. (sampling line 2-3 m, normal conditions)
Sampling delay 2.5 seconds typical with a 3 m sampling line
Total system response time 2.9 seconds typical with a 3 m sampling line, including sampling
delay and rise time
Display update rate breath-by-breath
Automatic compensation for pressure, CO2-N2O and CO2-O2 collision broadening effect.
Warm up time 2 min. for operation with CO2, O2, and N2O
5 min. for operation of anesthetic agents
30 min. for full specifications
Autozeroing interval Immediately after ‘calibrating gas sensor’ and 2, 5, 10, 15, 30, 45,
60 minutes after start-up, then every 60 minutes

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1.3.1 Normal conditions

Accuracy specifications apply in normal conditions (after 30 minutes warm-up period):
Ambient temperature 18...28 °C, within ±5 °C of calibration
Ambient pressure 500...800 mmHg, ±50 mmHg of cal.
Ambient humidity 20...80 % RH, ±20 % RH of cal.
Non-disturbing gases
− Ethanol C2H5OH(< 0.3%)
− Acetone (< 0.1%)
− Methane CH4 (< 0.2%)
− Nitrogen N2
− Carbon monoxide CO
− Nitric Oxide NO (< 200 ppm)
− water vapor
Maximum effect on readings
− CO2 < 0.2 vol%
− O2, N2O < 2 vol%
− anesthetic agents < 0.15 vol%
Effect of Helium decreases CO2 readings < 0.6 vol% typically

1.3.2 Conditions exceeding normal

Accuracy specifications under the following conditions; ŒŽ:
Œ Ambient temperature 10...40 °C, within ±5 °C of calibration
Ambient pressure 500...800 mmHg, ±50 mmHg of calibration
Ambient humidity 10...98 % RH, ±20 % RH of calibration
 During warm-up 2 to 10 minutes (anesthetic agents 5-10 minutes), under normal conditions
Ž During warm-up 10 to 30 minutes, under normal conditions
 N2O > 85%, under normal conditions

Accuracy under different conditions (see above)

Condition Œ and Ž Condition  Condition 
CO2 ±(0.3 vol% + 4 % of reading) ±(0.4 vol% + 7 % of reading)
(at 5 vol% error ±0.5 vol%) (at 5 vol% error ±0.75 vol%)
O2 ±(2 vol% + 2% of reading) ±(3 vol% + 3% of reading)
N2O ±(3 vol% + 3% of reading) ±(3 vol% + 5% of reading) ± (2vol% + 8% of reading)
Agents: ±(0.2 vol% + 10% of ±(0.3 vol% + 10% of
Hal, Enf, reading) reading)
Iso,Sev,
Des

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 Compact Airway modules

1.4 Patient spirometry specifications

1.4.1 Normal conditions

Accuracy specifications apply in normal conditions (after 10 minutes warm-up period):
Ambient temperature 10...40 °C
Ambient pressure 500...800 mmHg
Ambient humidity 10...98 %RH
Airway humidity 10...100 %RH
Respiration rate 4...35 breaths/min (adults)
4...50 breaths/min (pediatric)
I:E ratio 1:4.5...2:1
Intubation tube 5.5...10 mm (adults), 3...6 mm (pediatric)

Airway pressures (Paw, Ppeak, Pplat, PEEPe, PEEPiStat, PEEPiDyn, Pmean)

Measurement range -20...+100 cmH2O
Resolution 0.5 cmH2O
Accuracy ±1 cmH2O

Airway flow
Measurement range 1.5...100 l/min (adults)
(for both directions) 0.25...25 l/min (pediatric)

Tidal volume
Measurement range 150...2000 ml (adults), 15...300 ml (pediatric)
Resolution 1 ml
Accuracy ±6 % or 30 ml (adult), ±6 % or 4 ml (pediatric)

Minute volume
Measurement range 2...20 l/min (adults), 0.5...5 l/min (pediatric)
Resolution 0.1 l/min

Compliance
Measurement range 4...100 ml/cmH2O (adult), 1...100 ml/cmH2O (pediatric)
Resolution 1 ml/cmH2O (adult), 0.1 ml/cmH2O (pediatric)

Airway resistance
Measurement range 0...40 cmH2O/ l/s
Resolution 1 cmH2O/ l/s

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Other parameters
Specifications apply in conditions listed in patient spirometry specifications.

Dead space of the sensor

9.5 ml (adult), 2.5 ml (pediatric)

Resistance of the sensor

0.5 cmH2O @ 30 l/min (adult), 1.0 cmH2O @ 10 l/min (pediatric)

1.4.2 Conditions exceeding normal

Accuracy specifications under the following condition (during warm-up 2 to 10 minutes):

Airway Pressure(Paw)
Accuracy ±2 cmH2O

Tidal volume
Accuracy ±10 % or 100 ml (adult), ±10 % or 10 ml (pediatric)

1.5 Gas exchange specifications

Mathemathical integration of airway flow and gas concentration for intubated, mechanically
ventilated and/or partly spontaneously breathing patients.
NOTE: These specifications apply only when a 2 meter gas sampling line is used, and a Y-piece
with a physical dead space less than 8 ml.
NOTE: These specifications only apply if the FiO2 level delivered to the patient is varing by less than
0.2 % during the inspiratory cycle at the measurement point.

1.5.1 VO2 and VCO2

Measurement range 50...1000 ml/min
Resolution 10 ml/min
Accuracy ±10 % or 10 ml; when FiO2 < 65 %
±15 % or 15 ml; when 65 % < FiO2 < 85 %

1.5.2 RQ
Measurement range 0.6...1.2
Resolution 0.05

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2, N2O, and agent measurement

TPX is a side stream gas analyzer, measuring real time concentrations of CO2, N2O and anesthetic
agents (Halothane, Enflurane, Isoflurane, Desflurane, and Sevoflurane).

Temp sensor

Sample
chamber Thermopile
detectors

Sample Sample
gas out gas in

Figure 1 TPX sensor principle

Anesthetic agents or mixtures of two anesthetic agents are automatically identified and
concentrations of the identified agents are measured. TPX also detects mixtures of more than two
agents and issues an alarm.
TPX is a nondispersive infrared analyzer, measuring absorption of the gas sample at seven infrared
wavelengths, which are selected using optical narrow band filters.
The infrared radiation detectors are thermopiles.
Concentrations of CO2 and N2O are calculated from absorption measured at 3-5 µm.

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Figure 2 Absorbance of N2O and CO2

Identification of anesthetic agents and calculation of their concentrations is performed by

measuring absorptions at five wavelengths in the 8-9 µm band and solving the concentrations
from a set of five equations.

Figure 3 Infrared absorbance of AAs

The measuring accuracy is achieved utilizing numerous software compensations. The

compensation parameters are determined individually for each TPX during the factory calibration.

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2.1.2 O2 measurement
The differential oxygen measuring unit uses the paramagnetic principle in a pneumatic bridge
configuration. The signal picked up with a differential pressure transducer is generated in a
measuring cell with a strong magnetic field that is switched on and off at a frequency of 165 Hz.
The output signal is a DC voltage proportional to the O2 concentration difference between the two
gases to be measured.

Electromagnet
Mixture
out

Switched
magnetic
Microphone field

Sample in

Reference in

Figure 4 O2 measurement principle

2.1.3 Patient spirometry

In mechanical ventilation breaths are delivered to the patient by a ventilator with a proper tidal
volume (TV), respiration rate (RR), and inspiration / expiration ratio in time (I:E) determined by the
settings of the ventilator.
The Patient Spirometry monitors patient ventilation. The following parameters are displayed:
− Expiratory and inspiratory tidal volume (TV) in ml
− Expiratory and inspiratory minute volume (MV) in l/min
− Expiratory spontaneous minute volume in l/min
− Inspiration/expiration ratio (I:E)

Airway pressure
− Peak pressure (Ppeak)
− Mean airway pressure (Pmean); available only in S/5 Critical Care and Compact Critical Care
monitors
− End inspiratory pressure (Pplat)
− PEEPi, PEEPe; available only in S/5 Critical Care and Compact Critical Care monitors
− Total positive end expiratory pressure (PEEPtot); available only in S/5 Anesthesia and
Compact Anesthesia monitors
− Real time airway pressure waveform (Paw)
− Static Positive end expiratory pressures (Static PEEPi and Static PEEPe); available only in
S/5 Critical Care and Compact Critical Care monitors

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− Static Plateau pressure (Static Pplat); available only in S/5 Critical Care and Compact
Critical Care monitors
− Static Compliance (Static Compl); available only in S/5 Critical Care and Compact Critical
Care monitors
PEEP, Ppeak, Pmean, and Pplat are measured by pressure transducer on the PVX board. Atmospheric
pressure is used as a reference in measurement. The pressure measurement is made from the
airway part that is closest to the patient between patient circuit and intubation tube.
PEEPi=intrinsic PEEP, PEEPtot-PEEPe
Static pressure measurement maneuvres are automatically identified based on a increased zero
flow period at the end of the inspiration or expiration.
Static Compliance is calculated if Static PEEP and Static Pplat measurements were made within a 2
minute period.

Airway flow
− Real time flow waveform (V')
− Compliance (Compl)
− Airway resistance (Raw)
− Pressure volume loop
− Flow volume loop
The measurement is based on measuring the kinetic gas pressure and is performed using the Pitot
effect. A pressure transducer is used to measure the Pitot pressure. The pressure signal obtained is
linearized and corrected according to the density of the gas. Speed of flow is calculated from these
pressure values and the TV value is then integrated. The MV value is calculated and averaged using
TV and RR (respiratory rate) values.
Compliance and airway resistance
Compliance is calculated for each breath from the equation
TVexp
Compl = Formula 2
Pplat − PEEPi − PEEPe

Compliance describes how large a pressure difference is needed to deliver a certain amount of gas
to the patient.
The airway resistance, Raw, is calculated using an equation, that describes the kinetics of the gas
flow between the lungs and the D-lite. The equation states that the pressure at the D-lite can at any
moment of the breath be approximated using the equation
P(t) = Raw x V’(t) + V(t)/Compl + PEEPe + PEEPi Formula 3

where P(t), V’(t) and V(t) are the pressure, flow and volume measured at the D-lite at a time t, Raw is
the airway resistance, Compl is the compliance and PEEPe+PEEPi is the total positive end
expiratory pressure (PEEPtot).

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D-lite
Patient Spirometry uses specific sensors called D-lite+/D-lite and Pedi-lite+/Pedi-lite flow
sensors. Different types of sensors are available: adult sensor for measuring adults and pediatric
sensor for children. Both are available as reusable and disposable versions.
D-lite and Pedi-lite adapters are designed to measure kinetic pressure by two-sided Pitot tube.
Velocity is calculated from pressure difference according to Bernoulli's equation. Flow is then
determined using the calculated velocity.
2 × dP
v= (from Bernoulli's equation) Formula 4
ρ

F =v×A,

where:
F = flow (l/min), v = velocity (m/s), A = cross area (m2), dP = pressure difference (cmH2O),
ρ = density (kg/m3)
Finally the volume information is obtained by integrating the flow signal.

2.1.4 Gas exchange measurement

The gas exchange measurement uses the D-lite flow sensor and the gas sampler.
The basic data which is needed to obtain O2 consumption and CO2 production are volumes and
concentrations.
Concentrations have been corrected for delay and deformation during the transport of the gas
sample in a sidestream gas measurement sensor.
To obtain the amount of O2 consumed in ml/min, the amount which is exhaled is subtracted from
the amount that is inhaled.
To obtain the amount of CO2 producted in ml/min, the amount which is inhaled is subtracted from
the amount that is exhaled.
These amounts can be obtained by multiplying each measured volume piece (dv) by the
corresponding gas concentration:

VO2 = ò fO 2dv − ò fO 2dv Formula 5

insp exp

and

VCO2 = ò fCO 2dv − ò fCO 2dv Formula 6

exp insp

Using inspiratory and expiratory minute volumes MVi and MVe and volume-weighted inspiratory
concentrations fi and fe these equations can be rewritten as:
VO2 = fiO2 × MVi - feO2 × MVe [ml/min] Formula 7

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VCO2 = feCO2 × MVe - fiCO2 × MVi [ml/min] Formula 8

To obtain results which are less sensitive to errors in volume measurements, the so-called Haldane
transformation is used. This means taking advantage of the fact that the patient is not consuming
nor producing nitrogen: the amount of nitrogen inhaled is equal to the amount
exhaled fiN2 × MVi=feN2×MVe.
VO2 and VCO2 can then be written as:
VO2 = (fiO2 - fHald × feO2)MVi [ml/min] Formula 9

VCO2 = (fHald × feCO2 - fiCO2)MVi [ml/min] Formula 10

with
fHald = (1-fiCO2 – fiO2 – fiN2O - fiAne1 – fiAne2) / (1-feCO2 – feO2 – feN2O - feAne1 – feAne2)

EE=(5.5 × VCO2) + (1.76 × VO2) + (1.99 × Un) [kcal/day] Formula 11

with Un=Urea Nitrogen Excretion = 13 g/day (for adults only).

2.2 Main components

The compact airway modules consist of:
• Gas sampling system
• TPX measuring unit
• OM measuring unit
• PVX measuring unit
• CPU board
• OM board
• PVX board

2.2.1 Gas sampling system

The sampling system takes care of drawing a gas sample into the analyzers at a fixed rate.
The gas sampling system samples the measured air to the module, and removes water and
impurities from it. A sampling line is connected to the water trap. The pump draws gas through the
sampling line to gas measuring units. After the measurements, the gas is exhausted from sample
gas out connector.
The M-COVX and M-CAiOVX modules have a different gas sampling system compared to the other
modules. A number of flow restrictors have been changed to create a bigger pressure difference
with ambient pressure in the gas sensors. The sample flow is however about the same (200
ml/min).
A larger pressure difference makes the deformations of the gas concentration curves less sensitive
to high variations of the airway pressures thus meeting also the accuracy requirements of gas
exchange for these applications.

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D-fendTM
The sample is drawn through a sampling line. Then gas enters the monitor through the water trap,
where it is divided into two flows, a main flow and a side flow. The main flow goes into the
analyzers. This flow is separated from the patient side by a hydrophobic filter. The side flow creates
a slight subatmospheric pressure within the D-fend water trap which causes fluid removed by the
hydrophobic filter to collect in the bottle.

Zero valve and absorber

The main flow passes through a magnetic valve before
proceeding to the analyzers. This valve is activated to establish
the zero points for the TPX and OM units. When the valve is
activated, room air is drawn through the absorber into the internal
system and the gas sensors. Paralyme is used as an absorbent.
Figure 5 Absorber

NafionTM tubes 1)
A nafion tube is used between the water trap and the zero valve to balance the sample gas
humidity with that of ambient air. The tube will prevent errors caused by the effect of water vapor on
gas partial pressure when humid gases are measured after calibration with dry gases. Another
nafion tube is used between the absorper and the pneumatic unit to prevent humidity caused by
absorb of CO2.

Gas analyzers
After the zero valve and nafion tube the gas passes through TPX and OM units. The oxygen sensor
has two inputs. One input accepts the main flow and the other draws in room air for reference. Both
gas flows exit from a single port.

Sample flow differential pressure transducer

The sample flow differential pressure transducer measures pressure drop across OM inlet restrictor
and calculates sample flow from the pressure difference.

Working pressure transducer

The working pressure transducer measures absolute working pressure between the TPX unit and
OM unit. It is used for messages: ‘sample line blocked’, ‘check D-fend’, ‘replace D-fend’ and
‘check sample gas outlet’.

1)
Nafion is a trademark of Perma Pure Inc.

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Pneumatic unit
The pneumatic unit contains zeroing valve, occlusion valve and tubing connections. There is a
series of restrictors and chambers forming a pneumatic filter to prevent pressure oscillations from
the pump to reach the measuring units. The occlusion valve connection to room air includes a dust
filter and the zero valve connection to room air includes an absorber.

Connection block
The connection block contains sample gas outlet connector and OM unit reference gas inlet. The
inlet is equipped with a dust filter.

Occlusion valve
The valve is activated when the sampling line gets occluded. The main flow is then diverted to the
side flow of the D-fend water trap to faster remove the occlusion.

Sampling pump and damping chamber

The gas sampling pump is a membrane pump that is run by a brushless DC-motor. Sample flow is
measured with a differential pressure transducer across a known restriction. The motor is
automatically controlled to maintain a constant flow, even when the D-fend water trap ages and
starts to get occluded. It also enables use of sample tubes with varying lengths and diameters.
The damping chamber is used to even out the pulsating flow and silence the exhaust flow.
NOTE: In no occasion is the flow reversed towards patient.
CO2 absorber
Nafion tube

Pneumatic unit D-fend

G
Water trap
F

C
B

Nafion tube
Pressure transducers

B1

Connection block
B2

TPX unit

OUT IN

IN
OUT
Damping champer
Sampling pump

Figure 6 Gas sampling system layout, M-C

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CO2 absorber
Nafion tube

Pneumatic unit P
OUT
OM unit D-fend
G
REF Water trap
F IN

Nafion tube
Pressure transducers

B1

Connection block
B2

TPX unit

OUT IN

IN
OUT
Damping champer
Sampling pump

Figure 7 Gas sampling system layout, M-CAiOV, M-CAiOVX, M-CAiO, M-COVX, M-COV,
M-CO
Front panel

Room air
1) Reference gas
Filter
Filter
Absorber Room air
Zero
Occlusion
valve valve
1)
TPX OM
D-fend
Pressure Pressure
Sample transducer transducer
p pdp
line Pump
D-fend
1)

Tubing marked with 1) is thinner in M-CAiOVX and M-COVX module.

Figure 8 Gas tubing layout

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2.2.2 TPX measuring unit

The TPX unit is a non dispersive infrared analyzer, measuring absorption of the gas sample at seven
infrared wavelengths, which are selected using optical narrow band filters. The IR lamp is a 4 W
filament, surrounded by thermal isolation. There is a hole in the isolation, passing the radiation to a
conical measuring chamber with 4 mm length.
From the sample chamber, radiation goes into seven tubular light guides with reflective inner
surfaces. At the other end of each light guide, there is a thermopile detector with an optical filter in
front of it.
The Temp sensor measures the TPX units’ temperature and it is used for temperature
compensation.
The TPX unit includes a TPX board located at the end of the unit. Its function is to connect the 7
thermopile signals and the temperature sensor signal to the CPU board.

Figure 9 TPX measuring unit

2.2.3 OM measuring unit

The oxygen measurement is based on paramagnetic susceptibility. The gas and the reference gas,
which usually is room air, are conducted into a gap in an electromagnet with a strong magnetic
field switched on and off at a frequency of approximately 165 Hz.
An alternating differential pressure is generated between the sample and reference inputs due to
forces acting to the oxygen molecules in a magnetic field gradient.
The pressure is measured with a sensitive differential transducer, rectified with a synchronous
detector and amplified to produce a DC voltage proportional to the oxygen partial pressure
difference of the two gases.

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Figure 10 OM measuring unit

2.2.4 PVX measuring unit

NOTE: Never apply overpressure or negative pressure of more than 300 cmH2O to the flow and
volume tubing. Differential pressure max 25 cmH2O on one port at a time e.g. when connecting
tubes.
When Patient Spirometry is used, a special sensor, D-lite, replaces the normal airway adapter in
the patient circuit. A double lumen tubing is attached to the two connectors on the adapter and on
the module front panel.
The Patient Spirometry provides patient respiration monitoring capabilities using the D-lite and
Pedi-lite flow sensors.

Figure 11 PVX measuring unit

The measurement is based on measuring the kinetic gas pressure and is performed using the Pitot
effect. A pressure transducer is used to measure the Pitot pressure. The signal is then linearized
and corrected according to the density of the gas. Speed of the flow is calculated from the pressure
and TV is integrated from it.
Patient Spirometry consists of airway connections, two pressure transducers, valves and
preamplifiers. The preamplifiers are connected to the A/D-converter on module main CPU.
The breathing flow of a patient passing through the D-lite adapter creates a pressure difference.
This pressure difference is measured by pressure transducer, B1. Overpressure and negative
pressure in airways are measured by another pressure transducer B2.

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2.2.5 Gas exchange

The gas exchange measurement uses the concentrations measured by the TPX measurement unit
and the O2 measurement unit, in combination with the flow from the PVX measurement unit. The
gas exchange calculation is done by software.

CAUTION The gas exchange measurement in the M-CAiOVX and M-COVX modules works
accurately only with 2-meter gas sampling lines.

2.2.6 CPU board

The CPU board contains the processor and memories and A/D-converters that are common to the
whole module. The CPU board also contains preamplifiers of TPX-sensor and drivers for valves, fan,
pump and lamp. The module is connected to the module bus through a RS-485 serial channel.

TPX board CPU board

IR Thermopile Sensors preamps
Agents

x5
Anes.

MUX
N2O x2 and
CO2
buffer RS-485
T Sensor driver
Spirometry keyboard

T Sensor OM Board 2 ch
MUX CPU

Module Bus
MUX and A/D
O2 16 bit 80C196NT
buffer

Flow Press
PVX Board

Figure 12 Signal processing

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Lamp Unit CPU Board

TPX Valves
Lamp pneumatics
Lamp unit
Current Valves
Sensing
Fan

Module Bus
MUX &
A/D
buffer

Gas press
MUX A/D
Diff press
CPU reset
OM Board
Temp
80C196NT data
PVX sensor
valves

Figure 13 Control logic

TPX Board CPU Board

Correction data for

EEPROM amplification and

Module Bus
offset of all amplification
channels

EEPROM
OM Board
Factory calibration
data for OM and TPX
CPU RS-485
EEPROM
80C196NT driver

EEPROM Factory calibration

data for PVX
PVX Board

Figure 14 Calibration data stored in EEPROM

2.2.7 OM board
The Oxygen board contains the specific electronics for the oxygen sensor. Sample flow
measurement and sampling system pressure sensors are on this board. It also contains EEPROM’s
that store calibration data of both TPX and OM-sensors. The spirometry keyboard connection is on
this board.

2.2.8 PVX board

The Spirometry board is connected to the oxygen board. It contains pressure sensors for airway
pressure and flow measurement differential pressure and preamplifiers for those. Calibration data
of spirometry is stored on it’s own EEPROM.

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2.3 Connectors and signals

13 1
25 14

Figure 15 Module bus connector pin layout

Table 2 Module bus connector pin description

Pin No I/O Signal

1 I RESET RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15VDC
5 I/O -DATA RS485
6 I/O DATA RS485
7 Ground and Shield
8 I -RESET RS485
9 n/c
10 n/c
11 n/c
12 n/c
13 Ground and Shield
14 I +24/+32 VDIRTY depends on power supply (not used)
15 I Ground DIRTY
16 n/c
17 n/c
18 n/c
19 n/c
20 I GASFR (not used)
21 I CTSD (not used)
22 I TXDD (not used)
23 O RXDD (not used)
24 I +5 VDC
25 I +5 VDC DIRTY, for infrared lamps

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the compact airway modules is limited to replacing faulty circuit boards or
mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

CAUTION The module electronics can only be repaired and calibrated at the factory.

3.1.1 OM measuring unit

CAUTION Due to the complicated and sensitive mechanical construction of the O2 measuring
unit , no repairs should be attempted inside the unit.

3.1.2 TPX measuring unit

CAUTION The TPX photometer and its components are repaired/calibrated at the factory.
Attempts to repair/calibrate the unit elsewhere will adversely affect operation of the
unit. The information provided is for reference only.

3.1.3 OM, TPX, and PVX measuring unit

CAUTION The OM, TPX, and PVX measuring units can be repaired only at the factory.

3.1.4 Serviceable or exchangeable parts

• Absorber
• D-fend
• Nafion tubes
• Fan filter
• Fan
• CPU board
• CPU software
• PVX Unit including PVX board
• Pump
NOTE: After any component replacement see chapter Adjustments and calibrations.

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3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, APPENDIX A , which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Screwdriver
Ambient pressure manometer
Flowmeter
Flow cassette 50/1.1 873812
Extra silicon tubing
Calibration gas and the regulator 755583 (gas) for M-CAiOVX/M-CAiOV/M-CAiO
755534*
Calibration gas and the regulator 755587 (gas) for M-COVX
755534*
Calibration gas and the regulator 755581 (gas) for M-COV/M-CO/M-C
755534*
Gas Interface Cable 2.5 m / 8 ft 884299
*NOTE: Ensure that the calibration gas and the regulator are functioning properly before
calibration. Perform annual maintenance on the regulator as required.
See Calibration gas regulator flow check

3.2.2 Recommended parts

Part Order No. Notes
Absorber 895933
D-fend 876446
D-fend+ 881319 for M-COVX
Sampling line 3 m/10 ft 73319 anesthesia gas sampling line
Sampling line 2 m/7 ft 73318 for M-CAiOVX/M-COVX
D-lite / Pedi-lite 733950/73393

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Part Order No. Notes

D-lite+ for condensing active humidification circuits
Spirometry tube 2 m 890031
Spirometry tube 3 m 884101
D-fend O-ring (2 pcs) 65312
Filter (3 pcs) 886136 1 pcs @ latest revisions
Filter assembly 896025 @ latest revisions
Nafion tubes (2 pcs) 733382
Fan filter 886236

All modules
Detach the module box by removing the two screws from the back of the module. Be careful with
loose latch and spring pin for locking.
1. Check internal parts:
− all screws are tightened properly
− all cables are connected properly
− tubes are not pinched and there are no sharp bends on them
− all tubes are connected properly
− the front cover grounding pins are not bent against the CPU board
− there are no loose objects inside the module
NOTE: The tubes that are connected to the Oxygen board pressure transducers should not
be pressed too deep.
NOTE: Make sure that tubes are not in contact with the sampling pump or the O2 sensor, or
its springs.

?
2. Check external parts:
− the front cover and the front panel stickers are intact
− all connectors are intact and are attached properly
− the D-fend latch is moving properly
− the module box, the latch and the spring pin are intact

?
3. Clean or replace the fan filter.

?
4. Detach the D-fend. Check the condition of the rubber O-rings on the metal D-fend
connectors, located in the Compact Airway Module front cover.
If necessary, detach the connectors by first disconnecting the tubes, then removing the
locking rings from the back of the front cover.

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NOTE: The O-rings are recommended to be replaced annually.

?
5. Check that flow of air through the filters in the reference gas connection block (1 pc) and in
the pneumatic unit (1 or 2 pcs) is not obstructed.

Zero
filter

D
Occlu
si
filter on C

Reference gas
connection block

Figure 16 Pneumatic unit and reference gas connection block

NOTE: The filters should be replaced annually.

?
• Replace the old D-fend and sampling line with new ones.
NOTE: Use only Datex-Ohmeda sampling lines in order to ensure proper function.
2 m/7 ft sampling line should be used with M-COVX and M-CAiOVX.
• Connect the Compact Airway Module to the Central Unit’s Module motherboard
using the Gas interface cable (the grounding plates of the cable should be removed).
• Turn the monitor on.
• Configure the monitor screen so that all the needed parameters are shown, for
example as follows:
Monitor Setup - Screen 1 Setup - Waveform fields - Field 1 - Paw
Field 2 - Flow
Field 3 - Off
Field 4 - O2
Field 5 - AA
Field 6 - CO2
Digit Fields
Lower Field 1 - Gases
• Preset the following gas measurement settings (if available):
Airway Gas - Select Agent - Hal
Spirometry Setup - Scaling Vol
Paw Scale - 20
Flow Scale - 15
6. Check that the fan is running.

?
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7. Wait until the message ‘Calibrating gas sensor’ disappears from the screen, then enter the
Service menu.
Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)
Take down the information regarding Compact Airway Module software.

?
8. Enter the Compact Airway Module service menu.

Parameters - Gas Unit - General

Check that the shown module configuration corresponds with the used Compact Airway
Module type.

?
9. Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ -values are not increasing
faster than by 5 per second.
If one of the values is increasing faster it indicates a failure in module bus communication.

?
10. Enter the service menu Gases:

Gas Unit - Gases

Check that the flow measurement offset, i.e. the shown sample ‘Zero’ -value is within ±10
ml/min.

?
11. Check that the shown ‘Ambient’ -value corresponds with the current ambient pressure (±20
mmHg).

?
12. Check the zero valve.
Feed calibration gas and check that the gas readings in the service menu correspond with
the values on the gas bottle sticker. Keep feeding gas, then activate the zero valve from the
menu. The CO2 (N2O, AA) reading should drop back near 0 %, the O2 reading near 21 %.

?
13. Perform the steam test for the Nafion tubes, or replace those by new. Replace the
CO2 absorber, if necessary.

NOTE: The Nafion tubes are recommended to be replaced annually. In case of exchanging
the absorber it is recommended to replaced also this nafion tube.
NOTE: The CO2 absorber is recommended to be replaced once in four years.

?
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14. Perform sampling system leak test.

Prevent the module from performing the normal occlusion functions, i.e. controlling the
valves, by turning the pump first off, then on again from the menu.

Block the reference gas connector at the front panel.

Connect a flow cassette with high flow resistance value (50/1.1) to the end of the sampling
line and start following the ‘Amb-Work’ -value in the service menu. When the value exceeds
170 mmHg connect the other port of the flow cassette to the sample gas out connector and
switch the pump off.
Wait until pressure inside the sampling system is stabilized then notice the shown ‘Amb-
Work’ -value. The value, i.e. the pressure inside the sampling system should not drop more
than 6 mmHg in one minute.

If the pressure drops more, first ensure the made connections and repeat the test.

?
15. Check the flow rates.

Wait until the ‘Sample Flow’ -value is back near 200 ml /min.
Connect a flowmeter to the 3 meter sampling line (use a 2 meter sampling line for M-
CAiOVX and M-COVX) and check that the flow (the flowmeter reading) is within the following
range:

Sampling flow (ml/min) 180...220

If necessary, readjust the sampling flow:

Select ‘Sample gain adj’ from the menu. To increase the sampling flow, turn the ComWheel
counterclockwise, to decrease the flow, turn the ComWheel clockwise.
A change of 0.050 in the ‘Gain’ -value changes the flow approximately 10 ml/min.
After you have changed the gain, wait until the ‘Sample Flow’ -value on the screen gets back
near the original then check the flowmeter reading again.

Connect the flowmeter to the reference gas connector, check that the flow is within the
following range:

Reference flow M-CAiOVX/ M-C Others

(ml/min) M-COVX
27...40 25...45 31...45
(with 2m sampling (with 3m sampling (with 3m sampling
line) line) line)

Activate the zero valve on from the service menu. The ‘Sample Flow’ -value should not
change more than 20 ml/min. If the absorber is connected the value is 30 ml/min.

?
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16. Check that the ‘Amb-Work’ -value in the service menu is within the following range:

Amb-Work (mmHg) M-CAiOVX/M-COVX Others

70...115 40...75

?
17. Perform the gas calibration.

Airway Gas - Gas Calibration

NOTE: Calibration is not recommended until 30 minutes warm-up time has elapsed.
Use calibration gas 755587 (5 % CO2, 95 % O2) for calibrating Airway Module, M-COVX,
and calibration gas 755583 (2 % Desflurane, 5 % CO2, 33 % N2O, 55 % O2, balance N2) for
M-CAiOVX/M-CAiOV/M-CAiO,
and calibration gas 755581 (5 % CO2, 40 % N2O, 55 % O2) for calibrating
M-COV/M-CO/M-C.

NOTE: You can calibrate the modules M-CO and M-COV with the same calibration gas as the
M-COVX module, but M-C must always be calibrated with the gas 755581.

NOTE: For correct measurement values, modules need different amounts of oxygen in the
calibration mixture. If you do not use the recommended calibration gases, the calibration will
not succeed.

?
18. Perform the fall time measurement in the GASES service menu.

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8) -

Parameters - Gas Unit - Gases
Activate the measurement by selecting Fall Time Meas from the service menu. Feed
calibration gas until the message ‘Feed’ near the fall time values changes to ‘READY’. If
necessary, repeat the same procedure to get all the values on the screen.

Check that the measured values are within the following ranges:
CO2 fall time < 400 ms
O2 fall time < 400 ms
CO2-O2 delay < 800 ms

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Anesthesia Agent measurement

19. Agent ID reliability.
Feed calibration gas (order code 755583) continuously for at least 30 seconds and check
that the ‘ID’ in the service menu shows ‘DES’ and that the value for ‘ID unrel.’ is lower than 50.

If the value is higher, repeat the gas calibration and check the value again.

?
Patient Spirometry measurement
20. Enter the service menu Spirometry:

Gas Unit - Spirometry

Connect a clean Spirometry tube to the module and a clean D-lite to the other end of the
tube. Block the D-lite’s sampling line port, for example with a Luer stopper.

NOTE: Make sure that the date marking on the D-lite is 10/94 or newer.

Take the D-lite into your hand and occlude both ends tightly with your fingers (or with both
hands). Pressing creates a pressure inside the D-lite. Check that pressure near 5 cmH2O is
generated (the ‘Aw Pressure’ -value in the service menu).

If the system leaks heavily, no pressure will be generated.

If there is a small leak in the connections, the monitor will measure a pressure difference
which is then interpreted as flow and seen on the monitor screen. The pressure waveform
(and the ‘Aw Pressure’ -value) decreases slowly and the flow waveform (the ‘Flow’ -value)
either goes above, or below the zero line, depending on which of the connectors is leaking.

In case of leakage, first check all the connections and try again.

?
21. Remove the blockage from the sampling line port and connect the sampling line. Breath
through the wider side of the D-lite. Check that the flow waveform moves downwards when
you breath in, and upwards when you breath out.

?
22. If possible, check the Side Stream Spirometry measurement also with the Spirometry Tester
(order code 884202). Follow the instructions that are supplied with the tester.

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All modules
Turn the monitor off, disconnect the Gas interface cable and reassemble the module. Remember to
attach the plastic cover against the CPU board before installing the module box.

NOTE: When reassembling the module make sure that the tubes are not pinched between the
module box and internal parts.

23. Perform electrical safety check and leakage current test.

?
Install the Compact Airway Module into the Central Unit, turn the monitor on and wait until the
message ‘Calibrating gas sensor’ disappears from the screen.

24. Block the tip of the sampling line by your finger and check that the message ‘Sample line
blocked’ appears onto the monitor screen within 60 seconds.

?
25. Detach the D-fend and check that the messages ‘Check D-fend’ appears onto the monitor
screen within 30 seconds.

?
Reattach the D-fend. Simulate at least 5 breaths by feeding calibration gas into the
sampling line. Check that the shown gas information is correct.
26. Check that the monitor shows the message ‘Apnea’ within 30 seconds after you have
stopped feeding the gas.

?
27. Turn the monitor off, disconnect and clean the module.

?
• Fill in all necessary documents.
• It is recommended that you fill in the PM sticker, since the service check includes all
the Planned Maintenance actions. Attach it to a suitable place on the module box.

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3.3 Disassembly and reassembly

Disassemble the compact airway module in the following way. See also the exploded view of the
module.
1. Remove two screws from the back of the module.
2. Pull the module box slowly backwards and detach it from the main body.
Reassembling is essentially reversing what was described above.

CAUTION When reassembling the module, make sure that the tubes and cables are not
pinched between the boards and the cover.

CAUTION While reassembling the module, make sure that the grounding pins of the front unit
EMC shield are in contact contact with the module box. Bend the pins carefully, if
necessary.

3.3.1 PVX unit

1. Remove the module box.
2. Detach the CPU board and OM board from the module chassis (4 screws).
3. Disconnect the pump cable, pneumatics unit cable, fan cable, and the other cable of the
TPX unit from CPU board.
4. Disconnect OM unit’s cables, spirometry keyboard cable and PVX unit’s cables from the OM
board.
5. Detach the front panel from the module chassis (1 screw).
6. Detach the PVX unit from the front panel (1 screw).
7. Reassembling is essentially reversing what was described above.

3.3.2 Pump unit

1. Remove the module box.
2. Cut off the pump’s clamp (panduit).
3. Unplug the hoses of the pump.
4. Disconnect the pump’s cable from CPU board. Pass the cable under the pneumatic unit by
lifting it.
5. Reassembling is essentially reversing what was described above.

3.3.3 CPU board

1. Remove the module box.
2. Detach the CPU board and OM board from the module chassis (4 screws).
3. Disconnect the pump cable, pneumatics unit cable, fan cable, and both cables of the TPX

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unit from CPU board.

4. Detach the CPU board from the OM board.
5. Reassembling is essentially reversing what was described above.

3.3.4 Software of CPU board

1. Remove the module box.
2. Detach the CPU board and OM board from the module chassis (4 screws).
3. Disconnect the pump cable, pneumatics unit cable, fan cable, and the other cable of the
TPX unit from CPU board.
4. Detach the CPU board from the OM board.
5. Detach the software from the CPU board.
6. Reassembling is essentially reversing what was described above.

3.3.5 Instructions after replacing software or CPU board

After replacing the software or CPU board:
• perform the sampling system leak test.
• perform the occlusion test
• perform the gas calibration.
• perform Fall time Measurement

3.4 Adjustments and calibrations

See User’s Reference Manual for normal gas calibration instructions.

3.4.1 Gas sampling system adjustment

NOTE: Let the monitor run for 15 minutes before measuring flow rates.
For the flow rate measurements a flowmeter with a low flow resistance and capability to measure
low flow rates is required. A normal length of sampling line has to be connected to the monitor as it
has a considerable effect on the flow.

3.4.2 Flow rate measurement

If any flow rates are not correct, first replace the D-fend water trap. Then recheck the
incorrect flows.
Sampling flow rate is measured by rotameter at the sampling line. The rate should be between 180
and 220 ml/min. The flow rate is adjusted in the Gas Service Menu with ‘Sample Gain Adj.’.
Reference flow of the oxygen measuring unit are checked as follows:
Connect rotameter to the Gas Ref. inlet on the front panel. The flow rate should be between 31 and
45 ml/min (M-CAiOVX/M-COVX: 27-40 ml/min, M-C: 24-45 ml/min). The flow rate is not
adjustable.

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3.4.3 Flow rate adjustment

NOTE: Before adjusting the sampling flow make sure there is no leakage in the sampling system.
Refer to chapter 3.2 Service check, step 15; Check the flow rates.

3.4.4 Gas calibration

NOTE: Ensure that the calibration gas and the regulator are functioning properly before calibration.
Perform annual maintenance on the regulator as required.
The gas calibration is performed in the Airway Gas menu. Please refer User’s Reference Manual.

Calibration gas regulator flow check

Interval: every 12 months
Regulator flow specification:
REF 755533 & 755534: 260 – 410 ml/min at 1-10 bar cylinder pressure
REF 755530: 260 – 410ml/min at 5-7psi cylinder pressure
Tools needed: calibration gas ca, regulator, piece of sislicon hose and a flow meter. Datex-Ohmeda
recommends use of TSI 4140 Flow Meter.
Insert the calibration gas regulator on the gas cylinder. Connect a silicon hose between the
regulator and the flow meter. Block the regulator overflow port and open the regulator. Check the
flow rate from the flow meter and verify that the flow is within the specification.

3.4.5 Flow calibration

The PVX measuring unit is calibrated at the factory and due to the unit’s design calibration is not
regularly needed. The calibration data is saved into the board’s EEPROM. In case calibration is
needed, it is recommended to perform the calibration both with adult values using the D-lite, and
with pediatric values using Pedi-lite.
1. Connect a spirometry tube with a D-lite sensor to the compact airway module. To improve
the accuracy, the endotracheal tube and all accessories, which normally are in use, should
be attached also during the calibration.
2. Enter the Gas Unit service menu: Monitor Setup - Install Service - Service - Parameters.
Enter the Spirometry menu.
3. After the flow is zeroed ('Zero OK' message displayed ) attach a preferably spirometry tester
to the flow sensor (D-lite or Pedi-lite). Select the sensor type.
4. Perform the calibration according to the tester instructions. Observe the values of inspired
and expired tidal volumes.
5. Adjust the reading to match the calibration volume (about 1000 ml for the D-lite and 300
ml for the Pedi-lite). Adjust Exp Flow Gain and Insp Flow Gain values in proportion to the
difference between measured values and the spirometry tester reading.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

Trouble Possible cause/treatment
No response to breathing Sampling line or water trap blocked or loose, or improperly attached.
Water trap container full.
See the gas sampling system troubleshooting.
SENSOR INOP. -message The temperature is too high, check fan and filter at the front panel
Communication error, check timeout and bad checksum values at the
service menu
xx ZEROING ERROR -message Gas zeroing failed. Condensation or residual gases are affecting zero
measurement. Allow module to run drawing room air for half an hour and
calibrate again.
CHECK D-FEND -message Probably water trap or the sampling line is not attached properly. Gas zero
1)
(Air leak-message) valve failure. Pump failure or gas outlet blockage.
REPLACE D-FEND -message Indicates residue build-up on the water trap membrane. This decreases air
1)
(Replace water trap -message) flow. Replace the D-fend.
REBREATHING-message CO2 concentration in inspiratory air is too high. Possibly CO2 absorber in
1)
(FiCO2 high -message) ventilation is saturated. Change the ventilation absorber.
SAMPLE LINE BLOCKED-message Sampling line or water trap is occluded. Water trap container is full. If
1)
(Air leak -message) occlusion persists check internal tubing for blockages.
1)
(SELECT AGENT -message) No anesthetic agent is selected though delivery is started. Vaporizer valve is
broken, or traces of cleaning or disinfecting agent in the water trap container
affecting the readouts. Let the container dry properly after disinfection
before use.
No response to any gas Sampling line, water trap, or internal tubing blocked or loose, or improperly
attached.
Occlusion or zero valve malfunction. Pump failure. Supply voltage missing.
Serial communication error.

Trouble Possible cause/treatment

Sudden increase in gas display Water trap malfunction. Check all internal tubing and the interior of the water
trap for occlusions or leaks. Replace water trap. Check flow rates.
Abnormally high Pressure transducer failure.
response to all gases
(or abnormally low) or sudden
occlusion warning

1)
@ earlier revisions

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Trouble Possible cause/treatment

Strong drift in all gases Leak in sampling line or internal tubing (especially in conjunction with too
low readings).
MVexp << MVinsp message Leak in patient circuit between patient and D-lite, or in the patient lungs, or
leak in tubes from D-lite to module. Check D-lite connection and D-lite
tubing.
(Disconnection)1) Too small tidal volumes for accurate measurement (not shown during
(MVexp < 0.5 l/min message)1) Apnea). Gas sampling is working correctly. Check D-lite connections and D-
Low volumes lite tubing.

4.1.1 CO2 measurement

Problem Possible clinical cause Possible technical cause Action
too low ETCO2 value • sudden decrease in • leak in sampling system • check all connections
circulation
• calibration error • check calibration
• pulmonary embolism
• high by-pass flow from
• hyperventilation ventilator
• very large dead-space
• large shunting
too high ETCO2 • hypoventilation • D-fend contaminated • change D-fend
• increased metabolism • calibration error • check calibration
waveform clipped • • incorrect scaling • change scale
no response to • apnea • sampling line or water • check all connections
breathing 1) trap loose or blocked (air
• (disconnection) 1)
leak)
• sample gas outlet blocked • check that outlet is
open
ETCO2 overscale >15 • abnormally high ETCO2 • CO2 sensor contaminated • call service technician
% (>20 %)1) (permissive hypercapnia)
• D-fend malfunction • change D-fend
Shown untill 32 %,
specified range
0...15 %
ETCO2>PaCO2 • unit is mmHg or kPa and • “dry gas” as default • change to “wet gas”
ETCO2 is close to arterial by using
PCO2 install/service menu

1)
@ earlier revisions

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4.1.2 Patient spirometry

Problem Possible clinical cause Possible technical cause Action
insp TV>exp TV • leak in lungs • spirometry tube leak • check leakages --
perform leak test
• ET tube cuff leak • water inside D-lite or tubings • change tubings
and D-lite
• don’t use active
humidification
• another side stream gas • connect gas
sampling between D-lite and sampling only and
patient always to D-lite

• D-fend leaks • check D-fend

exp TV> insp TV • spirometry tube leak • check leakages --

perform leak test
• water inside D-lite or tubings • change tubings
and D-lite
• don’t use active
humidification
loop overscale • wrong scale selected • change scaling
monitored volumes < set • leak between ventilator and • check ventilator
volumes D-lite connections
strongly vibrating loop • mucus in ET tube - • suction the patient
• water or secretions in hoses • change dry D-lite
or D-lite and/or empty the
water from hoses
too large or too small • wrong mode vs sensor • check mode and
volumes selection sensor
• incompatible between − D-lite for adult
selected sensor and sensor
− Pedi-lite for
used
pediatric

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Problem Possible clinical cause Possible technical cause Action

fluctuating Raw • mucus in airways or tubings • ventilator exp. valve causes
fluctuations during exp.
• breathing effort against the
flow
ventilator
• patient triggered breaths
too high Raw • kink in tubing
• mucus
• asthmatic patient
• bronchospasm
Raw value invalid • spontaneous breaths
• breathing efforts against the
ventilator
• patient triggered breaths
too high Ppeak • bronchospasm
• patient is coughing
• patient breaths against the
ventilator
• obstruction in airways
• HME obstructed
static PEEPi not • CO2 measurement is not • connect CO2
measured connected meas. to D-lite
• stat PEEPi measurement • go to
1)
not selected spirometry
setup1)
• exp. pause did not last at
least 4 sec.
Compl value invalid • spontaneous breaths

1)
only @ earlier revisions

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4.1.3 Gas exchange

Problem Possible clinical cause Possible technical cause Action
“Strange” values • ventilation mode: • gas exchange not
BiPaP, CPAP with high measurable
continuous by-pass
flow
• presence of N2O or • do not use N2O or AA
anesthetic agents in in ICU, or use a M-
ICU applications CAiOVX module
Unphysiological VO2 • unstable O2 delivery • select oxygram and
readings verify the stableness
− gas mixer
of the curve
• RR over 35/min • reference gas inlet port • check reference port
blocked
• gas sampling line longer • change 2 m
than 2 m sampling line
• dead space of Y-piece > 8 • check the dead
ml space of Y-piece
• gas sampling line • gas sampling line
connected to HME should ALWAYS be
connected to D-lite
• D-lite incorrectly placed • do not connect
anything between D-
lite and Y-piece
• ALWAYS connect D-lite
between the HME and
Y-piece
VO2 value invalid, • over range
no VO2,
• no VO2 value
FiO2 > 85 %,
(FiO2+FiN2O) > 85 % • 999 ml/min < VO2 < 0

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4.2 Gas sampling system troubleshooting

The faults which can occur in the sampling system are: leaks or blockages in the tubing, failure of
the sampling pump or the magnetic valves, or diminishing of the flow rates because of dirt or other
matter accumulating in the internal tubing.
The following checks should help in localizing the fault. Whenever suspecting the sampling system
and always after having done any work on the sampling system check and if necessary adjust the
flow rate.

CAUTION The special internal sample tube is mechanically fragile. Sharp bends will cause
leaks.
NOTE: The D-fend water trap should be replaced when the REPLACE D-FEND message appears
during monitor startup.
NOTE: If any liquid has entered the TPX measuring unit due to water trap filter failure, contact
Datex-Ohmeda Technical Services.

4.2.1 Sampling system leak test

1. Prevent the module from performing the normal occlusion functions, i.e. controlling the
valves, by turning the pump first off, then on again from the menu.
2. Block the reference gas connector at the front panel.
3. Connect a flow cassette with high flow resistance value (50/1.1) to the end of the sampling
line and start following the ‘Amb-Work’ -value in the service menu. When the value exceeds
170 mmHg connect the other port of the flow cassette to the sample gas out connector and
switch the pump off.
4. Wait until pressure inside the sampling system is stabilized then notice the shown ‘Amb-
Work’ -value. The value, i.e. the pressure inside the sampling system should not drop more
than 6 mmHg in one minute.
5. If the pressure drops more, first ensure the connections you have made and repeat the test.

4.2.2 Steam test for the NafionTM tubes

Choose Halothane as anesthetic agent and let the monitor sample room air. Then quickly feed air
of 100 % relative humidity (for instance from a kettle in which you are boiling water) to the monitor.
If the digital reading jumps as much as 0.1 % replace the Nafion tubes.

4.3 OM measuring unit troubleshooting

CAUTION Due to the complicated and sensitive mechanical construction of the oxygen
measuring unit, no repairs should be attempted inside the unit. Instead, if the fault
has been found in the measuring unit itself, the entire module should be replaced
and the faulty module be sent to Datex-Ohmeda for repair.
In cases of no response to O2 or strong drift, check the tubing for loose connections, blockages and
leaks.

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CAUTION Never apply overpressure to the O2 measuring unit, as the pressure transducer may
be permanently damaged.
If the O2 signal is noisy, check the measurement unit suspension.

4.4 TPX measuring unit troubleshooting

CAUTION The TPX measuring unit can only be repaired and calibrated at the factory. In case of
failure, the entire module should be replaced and the faulty module be sent to
Datex-Ohmeda for repair.

4.5 PVX measuring unit troubleshooting

In case of failure the PVX unit can be replaced.
NOTE: Never apply overpressure or negative pressure of more than 300 cmH2O to the flow and
volume tubing. Also never apply differential pressure of more than 25 mmHg on one PVX-
connection at a time.

4.5.1 Spirometry tubing leak test

1. Select airway pressure (Paw) and flow waveforms (Flow) on the monitor screen.
2. Connect a clean spirometry tube to the module and a clean D-lite to the other end of the tube.
Block the D-lite’s sampling line port, for example with a luer stopper.
NOTE: Make sure that the date marking on the D-lite is 10/94 or newer.
3. Take the D-lite in your hand and occlude both ends tightly with your fingers (or with both
hands). Pressing firmly with the fingers creates a pressure inside the D-lite.
4. Check that a pressure of at least 5 cmH2O is generated. If the system leaks heavily, no
pressure will be generated. If there is a small leak in the connections, the monitor will
measure a pressure difference which is then interpreted as flow and seen on the monitor
screen. The pressure waveform decreases slowly and the flow waveform either goes above, or
below the zero line, depending on which of the connectors leak.

4.6 CPU board troubleshooting

Due to the complexity of the large scale integrated circuitry there are few faults in the CPU digital
electronics that can be located without special equipment.
Check only that RAM, EPROM, CPU, and other socketed ICs are properly installed.

4.7 Error messages

Message Explanation
Occlusion or Sample Line Blocked The sample tube inside or outside the monitor is blocked or
water trap is occluded. If occlusion persists, measured gas
values disappear.

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Continuous occlusion. Check sampling line and Occlusion over 40 seconds.

D-fend.
Check D-Fend -the water trap is not connected
-there is a leak in the sampling line inside the module. If air leak
persists measured gas values disappear.
Air leak detected. Check water trap and sample Air leak over 40 seconds.
gas out-flow. Press normal screen to continue.
1)
Replace D-fend (replace water trap) Indicates residue build-up on the water trap membrane. This
decreases air flow.
Gas calibration is not available during first 5 Entering calibration is not allowed during 5 minutes after power
minutes/during occlusion/during air leak up and during occlusion or air leak.
Gas out blocked - Gas out connector on the front panel, or the exhaust line
connected to it, is blocked.
- If the sample gas is returned to patient circuit the filter in the
return kit may be occluded.
- Make sure the sample gas outlet is connected to an open
scavenging system only where gas is removed in room
pressure.
Select agent1) No agent selected
1)
Select agent Mixture of agent is detected, but no agent is selected.
1)
Check agent Agent is selected manually, but it differs from the identified
one.
Failure in Agent ID (unknown agent) The agent ID has failed (due to a third agent).
Overrange FiO2 >100 % measured
Recalibration Time out, fluctivating gases, gain adjusted “over”
CO2, O2, AA, N2O
Zero error Unsuccessful zeroing.
Unstable, Calibr error Unsuccessful calibration.
Menu messages during calibration:
Zero error Unsuccessful zeroing
Adjust Calibration gas accepted and monitor is ready for adjusting the
gas values to match the calibration gas concentration
Unstable Unsuccessful calibration

1)
only @ earlier revisions

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Press the Monitor Setup key - select Install/Service (password: 16-4-34) - select Service
(password: 26-23-8) - select Parameters - select Gas Unit.

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5.1 General menu

Service Data field

Module configuration shows which measurement options are available, i.e. are detected by the
module.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure or module not in place. Also other modules can cause these
numbers to rise.

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5.2 Gases service menu

Noise Meas A selection for activating the noise measurement.

Sample gain adj A selection for adjusting the sampling pump gain, i.e. for for adjusting the sample flow
measurement.
Fall time Meas A selection for activating the fall time measurement.
Pump ctrl A manual control for the sampling pump
Zero valve ctrl A manual control for the zero valve.
Occl valve ctrl A manual control for the occlusion valve.
Record Data Record Data prints out the shown service data and board information (id. serial number and
software id.) onto the recorder module, M-REC.

Service Data field

O2, CO2, N2O, AA % -field shows realtime concentrations, noise-% is standard deviation of concentration.
O2, CO2, N2O, AA channels A-E
mV -field: signal is scaled to mV, Gain: User gain. It is scaled as (User gain)/(Factory gain).
ID Shows the identified agent.
ID unrel. The shown value tells how unreliable the identification is. With pure agent the value is normally <
50.
Sample Flow Sample Flow is calculated from differential pressure and is adjusted by the module. Zero value as
measured during initialization when the pump is off. Gain: sample flow measurement can be
calibrated by adjusting the gain.
Ambient Ambient: ambient pressure is measured every 30 min. Amb-Work: ambient pressure - sampling
system internal pressure.
Fall time CO2 and O2 in ms. For N2O and AA same as CO2.

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CO2-O2 Delay In ms. No delay between CO2, N2O, and agents.

Pump Can be toggled ON/OFF.
PWM output 0-100% is shown. Pump voltage is also shown.
Lamp The state, PWM control, and current of the lamp are shown.
Fan The state of the fan is shown.
Zero and Occl valve
Can be toggled between measurement state (MEAS) and zeroing/occlusion states (ZERO/OCCL).
Temp Temperatures measured by the module from TPX, CPU, and OM.
Time after power on
In minutes after power on.

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5.3 Spirometry service menu

Insp and exp flow gains can be adjusted if calibration is needed. Calibration pump or spirometry
tester is used and readings are observed from display. If a deviation exists, gains are adjusted
accordingly. Gain scaling is 1.000 when factory settings are in effect (1.050 in modules that
contain the Gas Exchange measurement).
When Adjust key is pressed, a separate box for adjusting the value appears. During adjustment
calibration values are sent to module. When comwheel is pressed, the values are permanently
stored in EEPROM of module and the box disappears.
Zero PVX Start zeroing of the pressure sensors. Effects Aw Pres Zero and Flow Zero value.
Exp Flow Gain / Insp Flow Gain
Adjust the Flow sensor gains.
Valves Switch between MEASUREMENT and ZEROING
VCO2 / VO2 GainAdjust the VCO2 and VO2 gain.
Y deadspace Adjust the Y-deadspace.
N2 injection Select between on (1) and off (0).
Record Data Record Data prints out the shown service data and board information (id. serial number and
software id.) onto the recorder module, M-REC.

Service Data field

• Sensor ADULT/PEDIATRIC according to selected measurement mode (sensor). Insp/Exp
Flow Gains shown apply to the selected sensor.
• Aw Press Zero and Flow Zero are a result of zeroing in user service menu. In factory
calibration menu they can be adjusted, but not permanently stored.
• Aw Press Gain is directly the value used in sw. It can be adjusted, but not permanently
stored.

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• Exp Flow and Insp Flow Gains are scaled as (user gain)/(factory gain). Exp and Insp Flow
Gains can be adjusted also in user service menu.
• Common Offset is the compensation factor for pressure difference reading of the difference
sensor when applying a equal pressure on both sides of the sensor.
• Valves can be changed between MEASUREMENT and ZEROING.
• Zeroing automatic zeroing either ENABLED or DISABLED (only factory service menu).
• Aw Pressure shows the real time value of airway pressure
• Condition shows in which reference conditions results are. With calibration pump or
spirometry tester the results are always in ATP. If breathing is detected (EtCO2 > 1.0 %),
results are according to Flow & Vol Setup selection.
• Flow shows flow measurement value.
• TVol Exp, TVol Insp, MVol Exp and MVol Insp are shown to ease calibration. The numbers are
the same as on main display. The former pump calibration procedure has been dropped
out. We claim that calibration is not needed in routine clinical use, so a separate Flow
calibration menu is not needed. Calibration can be done with the pump or spirometry tester.
The results must be taken from the screen and gains adjusted accordingly.
• VCO2 and VO2 Gain shows a value near 1000, the correct gains have been measured in the
factory.
• Y deadspace is the geometric volume in ml between the Y-piece and the D-lite. Default is 5
ml for a standard Y-piece (as delivered with Siemens 900C ventilators). Used for VCO2 and
VO2 delay time corrections.
• Set N2 injection to 1 during laboratory tests with a Spirometry tester and injection of N2 gas
(for scientific validations use only). At power on of the module, the value is always zero.
• Ambient pressure

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6 SPARE PARTS

6.1 Spare parts list

NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories catalogue.

20/21

22/23
a,b,c

Figure 17 Front panel stickers

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6.1.1 M-C rev. 00, M-CO rev. 00

Figure 18 Exploded view, M-C rev.00, M-CO rev.00, M-CaiO rev.00, M-COV rev. 01, M-
CaiOV rev.01, M-COVX rev.00

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Filter 886136
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 887006 893225
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
21 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 898624
21 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 8000204
22 Front Panel sticker set, DA ; M-C (rev.00-01) 892222 898516
22 Front Panel sticker set, DA ; M-CO (rev.00-01) 892223 898621

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22 Front Panel sticker set, DE ; M-C (rev.01-02) 890695 898507

22 Front Panel sticker set, DE ; M-CO (rev.00-01) 890692 898612
22 Front Panel sticker set, EN ; M-C (rev.00-01) 890694 898506
22 Front Panel sticker set, EN ; M-CO (rev.00-01) 890691 898611
22 Front Panel sticker set, ES ; M-C (rev.00-01) 892240 898510
22 Front Panel sticker set, ES ; M-CO (rev.00-01) 892241 898615
22 Front Panel sticker set, FI ; M-C (rev.00-01) 892246 898513
22 Front Panel sticker set, FI ; M-CO (rev.00-01) 892247 898618
22 Front Panel sticker set, FR ; M-C (rev.00-01) 890696 898508
22 Front Panel sticker set, FR ; M-CO (rev.00-01) 890693 898613
22 Front Panel sticker set, IT ; M-C (rev.00-01) 892234 898511
22 Front Panel sticker set, IT ; M-CO (rev.00-01) 892235 898616
22 Front Panel sticker set, JA ; M-C (rev.00-01) 894986 898517
22 Front Panel sticker set, JA ; M-CO (rev.00-01) 894987 898622
22 Front Panel sticker set, NL ; M-C (rev.00-01) 892228 898509
22 Front Panel sticker set, NL ; M-CO (rev.00-01) 892229 898614
22 Front Panel sticker set, NO ; M-C (rev.00-01) 893544 898515
22 Front Panel sticker set, NO ; M-CO (rev.00-01) 893547 898620
22 Front Panel sticker set, PT ; M-C (rev.00-01) 895245 898512
22 Front Panel sticker set, PT ; M-CO (rev.00-01) 895246 898617
22 Front Panel sticker set, SV ; M-C (rev.00-01) 891101 898514
22 Front Panel sticker set, SV ; M-CO (rev.00-01) 891104 898619

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6.1.2 M-C rev. 01-02, M-CO rev. 01-03

Figure 19 Exploded view M-C rev. 01-02, M-CO rev. 01-03, M-COV rev.02, M-COVX
rev.01, M-CAiO rev.01, M-CAiOV rev. 02, M-CAiOVX rev.00

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Ref. Gas and Output Connector 886245
8 Ref. Gas Filter and Frame 896025
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
18 Zero Absorber 895933
19 Membrane keypad for spirometry modules 895785
20 Front Panel sticker blanco, M-C(O), M-CAiO ; S/5 898624
20 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 898624

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20 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 8000204
23 Front Panel sticker set, DA ; M-C (rev.00-01) 892222 898516
23 Front Panel sticker set, DA ; M-C (rev.02) ; S/5 898516
23 Front Panel sticker set, DA ; M-CO (rev.00-01) 892223 898621
23 Front Panel sticker set, DA ; M-CO (rev.02) ; S/5 898621
23 Front Panel sticker set, DE ; M-C (rev.01-02) 890695 898507
23 Front Panel sticker set, DE ; M-C (rev.02) ; S/5 898507
23 Front Panel sticker set, DE ; M-CO (rev.00-01) 890692 898612
23 Front Panel sticker set, DE ; M-CO (rev.02) ; S/5 898612
23 Front Panel sticker set, EN ; M-C (rev.00-01) 890694 898506
23 Front Panel sticker set, EN ; M-C (rev.02) ; S/5 898506
23 Front Panel sticker set, EN ; M-CO (rev.00-01) 890691 898611
23 Front Panel sticker set, EN ; M-CO (rev.02) ; S/5 898611
23 Front Panel sticker set, ES ; M-C (rev.00-01) 892240 898510
23 Front Panel sticker set, ES ; M-C (rev.02) ; S/5 898510
23 Front Panel sticker set, ES ; M-CO (rev.00-01) 892241 898615
23 Front Panel sticker set, ES ; M-CO (rev.02) ; S/5 898615
23 Front Panel sticker set, FI ; M-C (rev.00-01) 892246 898513
23 Front Panel sticker set, FI ; M-C (rev.02) ; S/5 898513
23 Front Panel sticker set, FI ; M-CO (rev.00-01) 892247 898618
23 Front Panel sticker set, FI ; M-CO (rev.02) ; S/5 898618
23 Front Panel sticker set, FR ; M-C (rev.00-01) 890696 898508
23 Front Panel sticker set, FR ; M-C (rev.02) ; S/5 898508
23 Front Panel sticker set, FR ; M-CO (rev.00-01) 890693 898613
23 Front Panel sticker set, FR ; M-CO (rev.02) ; S/5 898613
23 Front Panel sticker set, IT ; M-C (rev.00-01) 892234 898511
23 Front Panel sticker set, IT ; M-C (rev.02) ; S/5 898511
23 Front Panel sticker set, IT ; M-CO (rev.00-01) 892235 898616
23 Front Panel sticker set, IT ; M-CO (rev.02) ; S/5 898616
23 Front Panel sticker set, JA ; M-C (rev.00-01) 894986 898517
23 Front Panel sticker set, JA ; M-C (rev.02) ; S/5 898517
23 Front Panel sticker set, JA ; M-CO (rev.00-01) 894987 898622
23 Front Panel sticker set, JA ; M-CO (rev.02) ; S/5 898622
23 Front Panel sticker set, NL ; M-C (rev.00-01) 892228 898509
23 Front Panel sticker set, NL ; M-C (rev.02) ; S/5 898509
23 Front Panel sticker set, NL ; M-CO (rev.00-01) 892229 898614
23 Front Panel sticker set, NL ; M-CO (rev.02) ; S/5 898614
23 Front Panel sticker set, NO ; M-C (rev.00-01) 893544 898515
23 Front Panel sticker set, NO ; M-C (rev.02) ; S/5 898515
23 Front Panel sticker set, NO ; M-CO (rev.00-01) 893547 898620
23 Front Panel sticker set, NO ; M-CO (rev.02) ; S/5 898620
23 Front Panel sticker set, PT ; M-C (rev.00-01) 895245 898512
23 Front Panel sticker set, PT ; M-C (rev.02) ; S/5 898512
23 Front Panel sticker set, PT ; M-CO (rev.00-01) 895246 898617
23 Front Panel sticker set, PT ; M-CO (rev.02) ; S/5 898617
23 Front Panel sticker set, SV ; M-C (rev.00-01) 891101 898514
23 Front Panel sticker set, SV ; M-C (rev.02) ; S/5 898514
23 Front Panel sticker set, SV ; M-CO (rev.00-01) 891104 898619
23 Front Panel sticker set, SV ; M-CO (rev.02) ; S/5 898619

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6.1.3 M-CAiO rev. 00, M-CAiOV rev. 01

Figure 20 Exploded view, M-C rev.00, M-CO rev.00, M-CAiO rev.00, M-COV rev. 01, M-
CAiOV rev.01, M-COVX rev.00

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Filter 886136
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 887006 893225
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
21 Front Panel kerboard sticker, FI ; M-COV(X), M-CAiOV(X) 897798 898634
21 Front Panel keyboard sticker, DA ; M-COV(X), M-CAiOV(X) 897801 898637
21 Front Panel keyboard sticker, DE ; M-COV(X), M-CAiOV(X) 897792 898628
21 Front Panel keyboard sticker, EN ; M-COV(X), M-CAiOV(X) 896331 898627
21 Front Panel keyboard sticker, FR ; M-COV(X), M-CAiOV(X) 897793 898629
21 Front Panel keyboard sticker, IT ; M-COV(X), M-CAiOV(X) 897796 898632

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21 Front Panel keyboard sticker, JA ; M-COV(X), M-CAiOV(X) 897802 898638

21 Front Panel keyboard sticker, NL ; M-COV(X), M-CAiOV(X) 897794 898630
21 Front Panel keyboard sticker, NO ; M-COV(X), M-CAiOV(X) 897800 898636
21 Front Panel keyboard sticker, PT ; M-COV(X), M-CAiOV(X) 897797 898633
21 Front Panel keyboard sticker, SV ; M-COV(X), M-CAiOV(X) 897799 898635
21 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 898624
21 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 8000204
21 Front Panelkeyboard sticker, ES ; M-COV(X), M-CAiOV(X) 897795 898631
22 Front Panel sticker set, DA ; M-CAiO (rev.00-01) 892226 898528
22 Front Panel sticker set, DA ; M-CAiOV (rev.01-02) 892227 898540
22 Front Panel sticker set, DE ; M-CAiO (rev.00-01) 890686 898519
22 Front Panel sticker set, DE ; M-CAiOV (rev.01-02) 890683 898531
22 Front Panel sticker set, EN ; M-CAiO (rev.00-01) 890685 898518
22 Front Panel sticker set, EN ; M-CAiOV (rev.01-02) 887312 898530
22 Front Panel sticker set, ES ; M-CAiO (rev.00-01) 892244 898522
22 Front Panel sticker set, ES ; M-CAiOV (rev.01-02) 892245 898534
22 Front Panel sticker set, FI ; M-CAiO (rev.00-01) 892250 898525
22 Front Panel sticker set, FI ; M-CAiOV (rev.01-02) 892251 898537
22 Front Panel sticker set, FR ; M-CAiO (rev.00-01) 890687 898520
22 Front Panel sticker set, FR ; M-CAiOV (rev.01-02) 890684 898532
22 Front Panel sticker set, IT ; M-CAiO (rev.00-01) 892238 898523
22 Front Panel sticker set, IT ; M-CAiOV (rev.01-02) 892239 898535
22 Front Panel sticker set, JA ; M-CAiO (rev.00-01) 894991 898529
22 Front Panel sticker set, JA ; M-CAiOV (rev.01-02) 894990 898541
22 Front Panel sticker set, NL ; M-CAiO (rev.00-01) 892232 898521
22 Front Panel sticker set, NL ; M-CAiOV (rev.01-02) 892233 898533
22 Front Panel sticker set, NO ; M-CAiO (rev.00-01) 893543 898527
22 Front Panel sticker set, NO ; M-CAiOV (rev.01-02) 893542 898539
22 Front Panel sticker set, PT ; M-CAiO (rev.00-01) 895244 898524
22 Front Panel sticker set, PT ; M-CAiOV (rev.01-02) 895243 898536
22 Front Panel sticker set, SV ; M-CAiO (rev.00-01) 891100 898526
22 Front Panel sticker set, SV ; M-CAiOV (rev.01-02) 891099 898538

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6.1.4 M-CAiO rev. 01-03, M-CAiOV rev. 02-04, M-CAiOVX rev. 00-02

Figure 21 Exploded view M-C rev. 01-02, M-CO rev. 01-03, M-COV rev.03, M-COVX
rev.02, M-CAiO rev.02, M-CAiOV rev. 03, M-CAiOVX rev.01

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Ref. Gas and Output Connector 886245
8 Ref. Gas Filter and Frame 896025
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
18 Zero Absorber 895933
19 Membrane keypad for spirometry modules 895785
20 Front Panel kerboard sticker, FI ; M-COV(X), M-CAiOV(X) 897798 898634
20 Front Panel keyboard sticker, DA ; M-COV(X), M-CAiOV(X) 897801 898637
20 Front Panel keyboard sticker, DE ; M-COV(X), M-CAiOV(X) 897792 898628
20 Front Panel keyboard sticker, EN ; M-COV(X), M-CAiOV(X) 896331 898627

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20 Front Panel keyboard sticker, FR ; M-COV(X), M-CAiOV(X) 897793 898629

20 Front Panel keyboard sticker, IT ; M-COV(X), M-CAiOV(X) 897796 898632
20 Front Panel keyboard sticker, JA ; M-COV(X), M-CAiOV(X) 897802 898638
20 Front Panel keyboard sticker, NL ; M-COV(X), M-CAiOV(X) 897794 898630
20 Front Panel keyboard sticker, NO ; M-COV(X), M-CAiOV(X) 897800 898636
20 Front Panel keyboard sticker, PT ; M-COV(X), M-CAiOV(X) 897797 898633
20 Front Panel keyboard sticker, SV ; M-COV(X), M-CAiOV(X) 897799 898635
20 Front Panel sticker blanco, M-C(O), M-CAiO ; S/5 898624
20 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 898624
20 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 8000204
20 Front Panelkeyboard sticker, ES ; M-COV(X), M-CAiOV(X) 897795 898631
20 Service sticker (small) ; M-CAiOVX (rev.01) ; S/5 898623
20 Spirometry sticker, DA ; M-COV(X), M-CAiOV(X) ; S/5 898637
20 Spirometry sticker, DE ; M-COV(X), M-CAiOV(X) ; S/5 898628
20 Spirometry sticker, EN ; M-COV(X), M-CAiOV(X) ; S/5 898627
20 Spirometry sticker, ES ; M-COV(X), M-CAiOV(X) ; S/5 898631
20 Spirometry sticker, FI ; M-COV(X), M-CAiOV(X) ; S/5 898634
20 Spirometry sticker, FR ; M-COV(X), M-CAiOV(X) ; S/5 898629
20 Spirometry sticker, IT ; M-COV(X), M-CAiOV(X) ; S/5 898632
20 Spirometry sticker, JA ; M-COV(X), M-CAiOV(X) ; S/5 898638
20 Spirometry sticker, NL ; M-COV(X), M-CAiOV(X) ; S/5 898630
20 Spirometry sticker, NO ; M-COV(X), M-CAiOV(X) ; S/5 898636
20 Spirometry sticker, PT ; M-COV(X), M-CAiOV(X) ; S/5 898633
20 Spirometry sticker, SV ; M-COV(X), M-CAiOV(X) ; S/5 898635
23 Front Panel sticker set, DA ; M-CAiO (rev.00-01) 892226 898528
23 Front Panel sticker set, DA ; M-CAiO (rev.02) ; S/5 898528
23 Front Panel sticker set, DA ; M-CAiOV (rev.01-02) 892227 898540
23 Front Panel sticker set, DA ; M-CAiOV (rev.03) ; S/5 898540
23 Front Panel sticker set, DA ; M-CAiOVX (rev.00) 897790 898552
23 Front Panel sticker set, DA ; M-CAiOVX (rev.01) ; S/5 898552
23 Front Panel sticker set, DE ; M-CAiO (rev.00-01) 890686 898519
23 Front Panel sticker set, DE ; M-CAiO (rev.02) ; S/5 898519
23 Front Panel sticker set, DE ; M-CAiOV (rev.01-02) 890683 898531
23 Front Panel sticker set, DE ; M-CAiOV (rev.03) ; S/5 898531
23 Front Panel sticker set, DE ; M-CAiOVX (rev.00) 897781 898543
23 Front Panel sticker set, DE ; M-CAiOVX (rev.01) ; S/5 898543
23 Front Panel sticker set, EN ; M-CAiO (rev.00-01) 890685 898518
23 Front Panel sticker set, EN ; M-CAiO (rev.02) ; S/5 898518
23 Front Panel sticker set, EN ; M-CAiOV (rev.01-02) 887312 898530
23 Front Panel sticker set, EN ; M-CAiOV (rev.03) ; S/5 898530
23 Front Panel sticker set, EN ; M-CAiOVX, SERV. (rev.00) 896594 898542
23 Front Panel sticker set, EN ; M-CAiOVX, SERV. (rev.01) ; S/5 898542
23 Front Panel sticker set, EN ; M-CAiOVX, SERV. (rev.01) ; S/5 898542
23 Front Panel sticker set, ES ; M-CAiO (rev.00-01) 892244 898522
23 Front Panel sticker set, ES ; M-CAiO (rev.02) ; S/5 898522
23 Front Panel sticker set, ES ; M-CAiOV (rev.01-02) 892245 898534
23 Front Panel sticker set, ES ; M-CAiOV (rev.03) ; S/5 898534
23 Front Panel sticker set, ES ; M-CAiOVX (rev.00) 897784 898546
23 Front Panel sticker set, ES ; M-CAiOVX (rev.01) ; S/5 898546
23 Front Panel sticker set, FI ; M-CAiO (rev.00-01) 892250 898525

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23 Front Panel sticker set, FI ; M-CAiO (rev.02) ; S/5 898525

23 Front Panel sticker set, FI ; M-CAiOV (rev.01-02) 892251 898537
23 Front Panel sticker set, FI ; M-CAiOV (rev.03) ; S/5 898537
23 Front Panel sticker set, FI ; M-CAiOVX (rev.00) 897787 898549
23 Front Panel sticker set, FI ; M-CAiOVX (rev.01) ; S/5 898549
23 Front Panel sticker set, FR ; M-CAiO (rev.00-01) 890687 898520
23 Front Panel sticker set, FR ; M-CAiO (rev.02) ; S/5 898520
23 Front Panel sticker set, FR ; M-CAiOV (rev.01-02) 890684 898532
23 Front Panel sticker set, FR ; M-CAiOV (rev.03) ; S/5 898532
23 Front Panel sticker set, FR ; M-CAiOVX (rev.00) 897782 898544
23 Front Panel sticker set, FR ; M-CAiOVX (rev.01) ; S/5 898544
23 Front Panel sticker set, IT ; M-CAiO (rev.00-01) 892238 898523
23 Front Panel sticker set, IT ; M-CAiO (rev.02) ; S/5 898523
23 Front Panel sticker set, IT ; M-CAiOV (rev.01-02) 892239 898535
23 Front Panel sticker set, IT ; M-CAiOV (rev.03) ; S/5 898535
23 Front Panel sticker set, IT ; M-CAiOVX (rev.00) 897785 898547
23 Front Panel sticker set, IT ; M-CAiOVX (rev.01) ; S/5 898547
23 Front Panel sticker set, JA ; M-CAiO (rev.00-01) 894991 898529
23 Front Panel sticker set, JA ; M-CAiO (rev.02) ; S/5 898529
23 Front Panel sticker set, JA ; M-CAiOV (rev.01-02) 894990 898541
23 Front Panel sticker set, JA ; M-CAiOV (rev.03) ; S/5 898541
23 Front Panel sticker set, JA ; M-CAiOVX (rev.01) ; S/5 898553
23 Front Panel sticker set, JA ;M-CAiOVX (rev.00) 897791 898553
23 Front Panel sticker set, NL ; M-CAiO (rev.00-01) 892232 898521
23 Front Panel sticker set, NL ; M-CAiO (rev.02) ; S/5 898521
23 Front Panel sticker set, NL ; M-CAiOV (rev.01-02) 892233 898533
23 Front Panel sticker set, NL ; M-CAiOV (rev.03) ; S/5 898533
23 Front Panel sticker set, NL ; M-CAiOVX (rev.00) 897783 898545
23 Front Panel sticker set, NL ; M-CAiOVX (rev.01) ; S/5 898545
23 Front Panel sticker set, NO ; M-CAiO (rev.00-01) 893543 898527
23 Front Panel sticker set, NO ; M-CAiO (rev.02) ; S/5 898527
23 Front Panel sticker set, NO ; M-CAiOV (rev.01-02) 893542 898539
23 Front Panel sticker set, NO ; M-CAiOV (rev.03) ; S/5 898539
23 Front Panel sticker set, NO ; M-CAiOVX (rev.00) 897789 898551
23 Front Panel sticker set, NO ; M-CAiOVX (rev.01) ; S/5 898551
23 Front Panel sticker set, PT ; M-CAiO (rev.00-01) 895244 898524
23 Front Panel sticker set, PT ; M-CAiO (rev.02) ; S/5 898524
23 Front Panel sticker set, PT ; M-CAiOV (rev.01-02) 895243 898536
23 Front Panel sticker set, PT ; M-CAiOV (rev.03) ; S/5 898536
23 Front Panel sticker set, PT ; M-CAiOVX (rev.00) 897786 898548
23 Front Panel sticker set, PT ; M-CAiOVX (rev.01) ; S/5 898548
23 Front Panel sticker set, SV ; M-CAiO (rev.00-01) 891100 898526
23 Front Panel sticker set, SV ; M-CAiO (rev.02) ; S/5 898526
23 Front Panel sticker set, SV ; M-CAiOV (rev.01-02) 891099 898538
23 Front Panel sticker set, SV ; M-CAiOV (rev.03) ; S/5 898538
23 Front Panel sticker set, SV ; M-CAiOVX (rev.00) 897788 898550
23 Front Panel sticker set, SV ; M-CAiOVX (rev.01) ; S/5 898550

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6.1.5 M-COV rev. 01, M-COVX rev. 00

Figure 22 Exploded view, M-C rev.00, M-CO rev.00, M-CAiO rev.00, M-COV rev. 01, M-
CAiOV rev.01, M-COVX rev.00

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Filter 886136
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 887006 893225
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
21 Front Panel kerboard sticker, FI ; M-COV(X), M-CAiOV(X) 897798 898634
21 Front Panel keyboard sticker, DA ; M-COV(X), M-CAiOV(X) 897801 898637
21 Front Panel keyboard sticker, DE ; M-COV(X), M-CAiOV(X) 897792 898628
21 Front Panel keyboard sticker, EN ; M-COV(X), M-CAiOV(X) 896331 898627
21 Front Panel keyboard sticker, FR ; M-COV(X), M-CAiOV(X) 897793 898629
21 Front Panel keyboard sticker, IT ; M-COV(X), M-CAiOV(X) 897796 898632

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21 Front Panel keyboard sticker, JA ; M-COV(X), M-CAiOV(X) 897802 898638

21 Front Panel keyboard sticker, NL ; M-COV(X), M-CAiOV(X) 897794 898630
21 Front Panel keyboard sticker, NO ; M-COV(X), M-CAiOV(X) 897800 898636
21 Front Panel keyboard sticker, PT ; M-COV(X), M-CAiOV(X) 897797 898633
21 Front Panel keyboard sticker, SV ; M-COV(X), M-CAiOV(X) 897799 898635
21 Front Panelkeyboard sticker, ES ; M-COV(X), M-CAiOV(X) 897795 898631
22 Front Panel sticker set, DA ; M-COV (rev.01-02) 892224 898659
22 Front Panel sticker set, DA ; M-COVX (rev.00-01) 892225 898671
22 Front Panel sticker set, DE ; M-COV (rev.01-02) 890689 898650
22 Front Panel sticker set, DE ; M-COVX (rev.00-01) 890698 898662
22 Front Panel sticker set, EN ; M-COV (rev.01-02) 890688 898649
22 Front Panel sticker set, EN ; M-COVX (rev.00-01) 890697 898661
22 Front Panel sticker set, ES ; M-COV (rev.01-02) 892242 898653
22 Front Panel sticker set, ES ; M-COVX (rev.00-01) 892243 898665
22 Front Panel sticker set, FI ; M-COV (rev.01-02) 892248 898656
22 Front Panel sticker set, FI ; M-COVX (rev.00-01) 892249 898668
22 Front Panel sticker set, FR ; M-COV (rev.01-02) 890690 898651
22 Front Panel sticker set, FR ; M-COVX (rev.00-01) 890699 898663
22 Front Panel sticker set, IT ; M-COV (rev.01-02) 892236 898654
22 Front Panel sticker set, IT ; M-COVX (rev.00-01) 892237 898666
22 Front Panel sticker set, JA ; M-COV (rev.01-02) 894988 898660
22 Front Panel sticker set, JA ; M-COVX (rev.00-01) 894989 898672
22 Front Panel sticker set, NL ; M-COV (rev.01-02) 892230 898652
22 Front Panel sticker set, NL ; M-COVX (rev.00-01) 892231 898664
22 Front Panel sticker set, NO ; M-COV (rev.01-02) 893546 898658
22 Front Panel sticker set, NO ; M-COVX (rev.00-01) 893545 898670
22 Front Panel sticker set, PT ; M-COV (rev.01-02) 895247 898655
22 Front Panel sticker set, PT ; M-COVX (rev.00-01) 895248 898667
22 Front Panel sticker set, SV ; M-COV (rev.01-02) 891103 898657
22 Front Panel sticker set, SV ; M-COVX (rev.00-01) 891102 898669

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6.1.6 M-COV rev 02-04, MCOVX rev. 01-03

Figure 23 Exploded view M-C rev. 01-02, M-CO rev. 01-03, M-COV rev.04, M-COVX
rev.03, M-CAiO rev.03, M-CAiOV rev. 04, M-CAiOVX rev.02

Item Description Order No. Replaced by

1 CPU board, Compact Airway Module 884313 8001806
2 PVX unit, Compact Airway Module 895946
3 Pump-air, 5-15VDC 57313
4 Nafion tubing, 300mm 733382
5 Fan, Compact Airway Module 886213
6 Fan filter 886236
7 Fan filter cover 886659
8 Ref. Gas and Output Connector 886245
8 Ref. Gas Filter and Frame 896025
9 O-ring 4.0x1.0 65312
10 Insulation plate 890873
11 Module box (double width) 893225
12 Latch for module box 879181
13 Spring pin 879182
14 Cable tie 640013
15 Cross recess screw UNC 4-40 61841
16 Cross cylinder-head screw M3x6 61721
17 Cross cylinder-head screw M3x6 61721
18 Zero Absorber 895933
19 Membrane keypad for spirometry modules 895785
20 Front Panel kerboard sticker, FI ; M-COV(X), M-CAiOV(X) 897798 898634
20 Front Panel keyboard sticker, DA ; M-COV(X), M-CAiOV(X) 897801 898637
20 Front Panel keyboard sticker, DE ; M-COV(X), M-CAiOV(X) 897792 898628
20 Front Panel keyboard sticker, EN ; M-COV(X), M-CAiOV(X) 896331 898627

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20 Front Panel keyboard sticker, FR ; M-COV(X), M-CAiOV(X) 897793 898629

20 Front Panel keyboard sticker, IT ; M-COV(X), M-CAiOV(X) 897796 898632
20 Front Panel keyboard sticker, JA ; M-COV(X), M-CAiOV(X) 897802 898638
20 Front Panel keyboard sticker, NL ; M-COV(X), M-CAiOV(X) 897794 898630
20 Front Panel keyboard sticker, NO ; M-COV(X), M-CAiOV(X) 897800 898636
20 Front Panel keyboard sticker, PT ; M-COV(X), M-CAiOV(X) 897797 898633
20 Front Panel keyboard sticker, SV ; M-COV(X), M-CAiOV(X) 897799 898635
20 Front Panelkeyboard sticker, ES ; M-COV(X), M-CAiOV(X) 897795 898631
20 Spirometry sticker, DA ; M-COV(X), M-CAiOV(X) ; S/5 898637
20 Spirometry sticker, DE ; M-COV(X), M-CAiOV(X) ; S/5 898628
20 Spirometry sticker, EN ; M-COV(X), M-CAiOV(X) ; S/5 898627
20 Spirometry sticker, ES ; M-COV(X), M-CAiOV(X) ; S/5 898631
20 Spirometry sticker, FI ; M-COV(X), M-CAiOV(X) ; S/5 898634
20 Spirometry sticker, FR ; M-COV(X), M-CAiOV(X) ; S/5 898629
20 Spirometry sticker, IT ; M-COV(X), M-CAiOV(X) ; S/5 898632
20 Spirometry sticker, JA ; M-COV(X), M-CAiOV(X) ; S/5 898638
20 Spirometry sticker, NL ; M-COV(X), M-CAiOV(X) ; S/5 898630
20 Spirometry sticker, NO ; M-COV(X), M-CAiOV(X) ; S/5 898636
20 Spirometry sticker, PT ; M-COV(X), M-CAiOV(X) ; S/5 898633
20 Spirometry sticker, SV ; M-COV(X), M-CAiOV(X) ; S/5 898635
23 Front Panel sticker set, DA ; M-COV (rev.01-02) 892224 898659
23 Front Panel sticker set, DA ; M-COV (rev.03) ; S/5 898659
23 Front Panel sticker set, DA ; M-COVX (rev.00-01) 892225 898671
23 Front Panel sticker set, DA ; M-COVX (rev.02) ; S/5 898671
23 Front Panel sticker set, DE ; M-COV (rev.01-02) 890689 898650
23 Front Panel sticker set, DE ; M-COV (rev.03) ; S/5 898650
23 Front Panel sticker set, DE ; M-COVX (rev.00-01) 890698 898662
23 Front Panel sticker set, DE ; M-COVX (rev.02) ; S/5 898662
23 Front Panel sticker set, EN ; M-COV (rev.01-02) 890688 898649
23 Front Panel sticker set, EN ; M-COV (rev.03) ; S/5 898649
23 Front Panel sticker set, EN ; M-COVX (rev.00-01) 890697 898661
23 Front Panel sticker set, EN ; M-COVX (rev.02) ; S/5 898661
23 Front Panel sticker set, ES ; M-COV (rev.01-02) 892242 898653
23 Front Panel sticker set, ES ; M-COV (rev.03) ; S/5 898653
23 Front Panel sticker set, ES ; M-COVX (rev.00-01) 892243 898665
23 Front Panel sticker set, ES ; M-COVX (rev.02) ; S/5 898665
23 Front Panel sticker set, FI ; M-COV (rev.01-02) 892248 898656
23 Front Panel sticker set, FI ; M-COV (rev.03) ; S/5 898656
23 Front Panel sticker set, FI ; M-COVX (rev.00-01) 892249 898668
23 Front Panel sticker set, FI ; M-COVX (rev.02) ; S/5 898668
23 Front Panel sticker set, FR ; M-COV (rev.01-02) 890690 898651
23 Front Panel sticker set, FR ; M-COV (rev.03) ; S/5 898651
23 Front Panel sticker set, FR ; M-COVX (rev.00-01) 890699 898663
23 Front Panel sticker set, FR ; M-COVX (rev.02) ; S/5 898663
23 Front Panel sticker set, IT ; M-COV (rev.01-02) 892236 898654
23 Front Panel sticker set, IT ; M-COV (rev.03) ; S/5 898654
23 Front Panel sticker set, IT ; M-COVX (rev.00-01) 892237 898666
23 Front Panel sticker set, IT ; M-COVX (rev.02) ; S/5 898666
23 Front Panel sticker set, JA ; M-COV (rev.01-02) 894988 898660
23 Front Panel sticker set, JA ; M-COV (rev.03) ; S/5 898660

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23 Front Panel sticker set, JA ; M-COVX (rev.00-01) 894989 898672

23 Front Panel sticker set, JA ; M-COVX (rev.02) ; S/5 898672
23 Front Panel sticker set, NL ; M-COV (rev.01-02) 892230 898652
23 Front Panel sticker set, NL ; M-COV (rev.03) ; S/5 898652
23 Front Panel sticker set, NL ; M-COVX (rev.00-01) 892231 898664
23 Front Panel sticker set, NL ; M-COVX (rev.02) ; S/5 898664
23 Front Panel sticker set, NO ; M-COV (rev.01-02) 893546 898658
23 Front Panel sticker set, NO ; M-COV (rev.03) ; S/5 898658
23 Front Panel sticker set, NO ; M-COVX (rev.00-01) 893545 898670
23 Front Panel sticker set, NO ; M-COVX (rev.02) ; S/5 898670
23 Front Panel sticker set, PT ; M-COV (rev.01-02) 895247 898655
23 Front Panel sticker set, PT ; M-COV (rev.03) ; S/5 898655
23 Front Panel sticker set, PT ; M-COVX (rev.00-01) 895248 898667
23 Front Panel sticker set, PT ; M-COVX (rev.02) ; S/5 898667
23 Front Panel sticker set, SV ; M-COV (rev.01-02) 891103 898657
23 Front Panel sticker set, SV ; M-COV (rev.03) ; S/5 898657
23 Front Panel sticker set, SV ; M-COVX (rev.00-01) 891102 898669
23 Front Panel sticker set, SV ; M-COVX (rev.02) ; S/5 898669

6.1.7 D-fend latch

Figure 24 D-fend latch

Item Description Order No. Replaced by

1 PIN, M-CAiOV 887005
2 LATCH, M-CAiOV 885493
3 Spring-comp 64242
4 Hige, M-CAiOV 886235

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7 EARLIER REVISIONS
Revision Manual slot/main manual Note
Compact Airway Module, M-CAiOVX (rev. 00) 896 619/896 624
Compact Airway Module, M-CAiOV (rev. 02)
Compact Airway Module, M-CAiO (rev. 01)
Compact Airway Module, M-COVX (rev. 01)
Compact Airway Module, M-COV (rev. 02)
Compact Airway Module, M-CO (rev. 01)
Compact Airway Module, M-C (rev. 01)

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APPENDIX A

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SERVICE CHECK FORM

Compact Airway modules
Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules
OK N.A. Fail OK N.A. Fail
1. Internal parts 2. External parts

3. Fan filter 4. D-fend O-rings

5. Other filters

Notes

OK N.A. Fail OK N.A. Fail

6. Fan

7. Module software GAS

8. Module configuration 9. Module bus
communication
10. Flow measurement offset ±10 ml/min
11. Ambient pressure 12. Zero valve

13. Special tubes CO2 absorber

14. Leak test ≤ 6 mmHg/min

15. Flow rates
Sampling flow 180...220 ml/min
Reference flow (M-CAiOVX/M-COVX) 27...40 ml/min
Reference flow (M-CAiOVX/M-COVX) 27...40 ml/min
Reference flow (M-C) 25...40 ml/min
Reference flow (M-C) 24...45 ml/min

A-1(2)
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Reference flow (others) 31…45 ml/min

Zeroing flow ±20 ml/min

16. Working pressure

Amb-Work 40...75 mmHg
Amb-Work (M-CAiOVX/M-COVX) 70...115 mmHg
OK N.A. Fail
17. Gas calibration

18. Fall time measurement

CO2 fall time < 400 ms
O2 fall timeb < 400 ms
CO2-N2O delay < 800 ms

AA option S/N
19. ID unrel. < 50

Patient spirometry option S/N

OK N.A. Fail OK N.A. Fail
20. Spirometry system 21. Flow waveform
leak test
22. Spirometry tester

All modules
23. Electrical safety check 24. Occlusion detection

25. Air leak detection 26. Apnea detection

27. Final cleaning

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 8001009-5
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S/5TM Tonometry Module, M-TONO (rev. 01)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1010-3

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 39411 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.us.datex-ohmeda.com www.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5 Tonometry Module, M-TONO
TABLE OF CONTENTS i
TABLE OF FIGURES ii
TABLE OF TABLES ii
INTRODUCTION 1
1 Specifications 2
1.1 General specifications ..............................................................................................................................2
1.2 Parameter specifications...........................................................................................................................2
1.2.1 PgCO2 ..............................................................................................................................................2
2 Functional Description 3
2.1 Measurement principle .............................................................................................................................3
2.1.1 CO2 measurement ............................................................................................................................3
2.2 Main components.....................................................................................................................................4
2.2.1 Gas sampling system........................................................................................................................4
2.2.2 CO2 sensor.......................................................................................................................................5
2.2.3 CPU board .......................................................................................................................................6
2.3 Connectors and signals.............................................................................................................................7
3 Service Procedures 8
3.1 General service information.......................................................................................................................8
3.1.1 CO2 sensor.......................................................................................................................................8
3.1.2 Factory calibration data ....................................................................................................................8
3.1.3 Serviceable or exchangeable parts....................................................................................................8
3.2 Service check ...........................................................................................................................................9
3.2.1 Recommended tools ........................................................................................................................9
3.2.2 Recommended parts ........................................................................................................................9
3.3 Disassembly and reassembly..................................................................................................................12
3.3.1 Instructions after replacing tubings..................................................................................................12
3.4 Adjustments and calibrations..................................................................................................................13
3.4.1 Pressure sensor calibration.............................................................................................................13
3.4.2 System test ....................................................................................................................................14
3.4.3 PgCO2 calibration ...........................................................................................................................14
4 Troubleshooting 15
4.1 Troubleshooting chart .............................................................................................................................15
4.2 Gas sampling system troubleshooting .....................................................................................................15
5 SERVICE MENU 16
5.1 Tonometry service menu .........................................................................................................................17
5.2 Tonometry ..............................................................................................................................................20
5.3 Press sensor calibration ..........................................................................................................................21
5.4 System test ............................................................................................................................................22
5.5 CO2 sensor .............................................................................................................................................23
5.6 Pneumatics ............................................................................................................................................25

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5.7 AD .........................................................................................................................................................26
6 Spare parts 27
6.1 Spare parts list .......................................................................................................................................27
6.1.1 Tonometry Module, rev. 00, 01 .......................................................................................................27
7 EARLIER REVISIONS 29
APPENDIX A, Service check FORM A-1
APPENDIX B, HOW TO READ HEX NUMBERS B-1

TABLE OF FIGURES
Figure 1 Front panel of S/5 Tonometry Module, M-TONO..................................................................................... 1
Figure 2 Absorbance of CO2 ...............................................................................................................................3
Figure 3 Gas sampling system layout ................................................................................................................. 4
Figure 4 CO2 sensor........................................................................................................................................... 5
Figure 5 Signal processing of the module ........................................................................................................... 6
Figure 6 Signal and control logic ........................................................................................................................ 6
Figure 7 Exploded view of S/5 Tonometry Module, M-TONO ..............................................................................27

TABLE OF TABLES
Table 1 Module bus connector.......................................................................................................................... 7
Table 2 Module general status ........................................................................................................................17
Table 3 Module hardware status .....................................................................................................................18
Table 4 Module keyboard status .....................................................................................................................18
Table 5 Module general error status ................................................................................................................18
Table 6 Module pneumatics error status..........................................................................................................19
Table 7 Module hardware error status..............................................................................................................19
Table 8 Description of system test...................................................................................................................22
Table 9 HEX to binary conversion....................................................................................................................B-1

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INTRODUCTION
This slot provides information for maintenance and service of the Datex-Ohmeda S/5 Tonometry
Module, M-TONO. Please also refer to the Technical Reference Manual of S/5 Monitor for
information related to system e.g. related documentation, conventions used, symbols on
equipment, safety precautions, system description, system installation, interfacing, functional
check and planned maintenance.
The S/5 Tonometry Module is single width plug-in module and is designed for use with the S/5
monitors. The module provides gastric tonometry measurement, i.e. it measures the
gastrointestinal CO2 concentration, PgCO2.
The Tonometry Module contains the CO2 gas concentration sensor and a gas sampling system to
move gas between the patient’s gastrointestinal tract and the sensors. The patient is connected to
the module with a TonometricsTM Catheter, which is inserted into the gastrointestinal tract.
A sample is taken at regular intervals to determine the CO2 concentration of the gas.

PgCO 2

Use only with

2
Tonometrics™
catheters

Figure 1 Front panel of S/5 Tonometry Module, M-TONO

(1) Direct module keys:

Start
Stop
Starts/Stops the PgCO2 measurement cycle.
Lab.
Data
Takes you to Lab Data menu to enter the blood gas values.
(2) Connector for the Tonometrics Catheter

NOTE: The S/5 Tonometry Module, M-TONO functions only with monitor software of level 99 or
newer.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 37 × 190 × 112 mm, 1.5 × 7.5 × 4.4 in
Module weight 0.5 kg /1.1 lbs
Operating temperature +10...+40 °C
Storage temperature -25...+70 °C
Atmospheric pressure 666...1060 hPa
(67...106 kPa/500...800 mmHg/666...1060 mbar)
Humidity 10...90 % non-condensing
Power consumption 0.7 W Prms, 9.0 W momentary
Protection against electrical shock Type BF (IEC-60601-1) defibrillator-proof protection
against electric shock

1.2 Parameter specifications

Measurement interval is 10 minutes.

1.2.1 PgCO2
Measurement range 0...30 kPa (0...228 mmHg)
1
Accuracy
in range 0...15 kPa (0...113 mmHg) ±(0.5 kPa +5 % of reading)
±(4 mmHg +5 % of reading)
in range 15...30 kPa (113...228 mmHg) 1.5 kPa ±15 % of reading
12 mmHg ±15 % of reading
Accuracy specifications apply in normal conditions:
Measurement is done at least 30 minutes after catheter initialization and calibration has been
checked within 2 weeks.
Ambient temperature 10...40 °C, within ±5 °C of calibration
Ambient pressure 500...800 mmHg, ±50 mmHg of calibration
Ambient humidity 10...90 %RH, ±20 %RH of calibration

1 These specifications only apply when TONO-8F, TONO-14F, TONO-16F, TONO-18F catheters with 13 mm biofilter are used.

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2 measurement

The CO2 sensor measurement is based on the infrared (IR) absorption technique. CO2 molecules
absorb IR-light, that has a certain wave length (4.26 µm). This wavelength is selected from the
incoming IR-light with a special optical bandpass filter. The IR-light passed through the
measurement chamber and the filter and the signal is then detected with a thermopile.
The calculation of CO2 concentration needs also the determination of the signal level, when there is
no CO2 in the measured gas. This procedure is the zeroing of the sensor. The zeroing is done with
room air and it is always done before measuring the sample gas.
The CO2 and zeroing gas measurements are done by pulsing the IR-lamp 3 times (lamp is on 2
seconds and off 2 seconds) and by measuring the thermopile signal during pulsing. The CO2
concentration is defined then from these signals. In the definition of CO2 partial pressure (PgCO2),
the influence of sensor temperature, measurement pressure, catheter pressure, gas mixing in
tubings and the drop in water vapour pressure on the measurement result are compensated.
Absorbance (arbitrary units)

CO2

Filter

4.0 4.5
Wavelength (µm)

Figure 2 Absorbance of CO2

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2.2 Main components

The tonometry module consist of:
• gas sampling system
• CO2 measuring unit
• CPU board.

2.2.1 Gas sampling system

Valve unit
room
air inlet
filter
catheter Pump unit
pressure pump
transducer zero valve pump valve pressure
transducer
P
membrane
Tube unit P pump
CO2 linear
to sensor
M stepper
catheter
connector motor
= PVC tube room
= PVC+NafionTM tube air inlet
Figure 3 Gas sampling system layout

The tonometry measurement is done at regular intervals of 10 minutes. The measurement cycle
starts with CO2 sensor zeroing. Zeroing means flushing the gas measurement chamber with room
air and measuring the signal level of IR-light passed through the room air. Right after zeroing the
sensor, sample gas is aspirated from the tonometry catheter and the IR-signal passed through the
sample gas is measured. The actual CO2 concentration is determined from the measured zero
signal and the CO2 signal. After determining the catheter gas CO2 the system ensures the catheter
is emptied by creating a vacuum to empty any residual gas. After generating the vacuum, the
tubing system is equilibrated close to the ambient pressure by switching the pump valve on and
off. Thus, filling of the catheter is always done with the same amount of gas. The catheter is refilled
with measured sample gas.

Catheter pressure transducer

The catheter pressure transducer measures absolute catheter pressure.

Zero valve
The valve is normally open to the room air. When sample gas is measured from the catheter, zero
valve will be active.

Sensor
After the zero valve the gas passes through CO2 sensor.

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NafionTM tube 1)
A nafion tube is used between the CO2 sensor and tube unit to balance the sample gas humidity
with that of ambient air. The CO2 sensor measures humid gas and Nafion tube prevents humidity
from increasing in the tubes.

Tube unit
The tube unit is used between the nafion tube and pump unit to store the sample gas.

Pump valve
The valve is normally open to room air. When CO2 concentration is measured from the sample gas
or from room air, the pump valve will be active.

Pump pressure transducer

The working pressure transducer measures absolute pump pressure. It is used for the catheter
empty message, catheter leakage message and unable to fill catheter message.

Membrane pump and linear stepper motor

The gas sampling pump is a membrane pump that is run by a linear stepper motor. Sample volume
is 4 ml.

2.2.2 CO2 sensor

Temp sensor
CO2
IR Lamp sensor
Sample chamber board Temp
I CO2 To
CPU
Optical Thermopile board
filter detectors

EEPROM

Sample Sample
gas out gas in

Figure 4 CO2 sensor

The CO2 sensor is a non dispersive infrared analyzer, measuring absorption of the gas sample at
CO2 infrared wavelength, which is selected using optical narrow band filter. The IR lamp is a
500 mW filament, surrounded by thermal isolation. There is a hole in the isolation, passing the
radiation to a conical measuring chamber with 3 mm length.
The CO2 sensor contains own preamplifier board, which amplifies the thermopile signal. The
preamplifier board also contains EEPROMs that store calibration data of CO2 sensor.
The Temp sensor measures the temperature of the CO2 unit and it is used for temparature
compensation.

1)
Nafion is a trademark of Perma Pure Inc.

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2.2.3 CPU board

The CPU board contains the processor, memories and AD-converter that are common to the whole
module. The CPU board also contains preamplifiers of pressure sensors and drivers for valves,
linear stepper motor and lamp. The module is connected to the module bus through an RS-485
serial channel.
The CO2 sensor preamplifier board contains the EEPROM, preamplifier of IR thermopile sensors
and temp sensor.
CO2 preamplifier board CPU board
IR
Thermopile
Sensor

Temp
Sensor EEPROM

EEPROM

RS-484

Module bus
A/D 12 bit
Pump unit driver

Pump press

Pump valve CPU

Linear stepper Stepper H8/3048
motor motor

TONO_CPU_signal_proc_module.vsd
control
Zero unit

Cath press

Zero valve

Lamp unit Lamp

current
Lamp
control

Figure 5 Signal processing of the module

T u b e u n it

V a lv e C O 2 P u m p
u n it s e n s o r u n it
d a ta
la m p c u r r e n t

te m p e ra tu re
E E P R O M
c o n tro l

2
C O

z e r o v a lv e
c o n tro l
X 6 X 2
p u m p p re s s u re
c a th e te r X 4
p re s s u re X 3 p u m p v a lv e c o n tr o l
C P U
m o to r c o n tro l
b o a rd
M e m b ra n e
k e y s X 7
X 8

m o d u le b u s c o n n e c to r

Figure 6 Signal and control logic

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2.3 Connectors and signals

13 1
25 14

Table 1 Module bus connector

Pin No. I/O Signal

1 I RESET RS485
2 I -15 VDC (not used)
3 I +15 VDIRTY
4 I +15VDC
5 I/O -DATA RS485
6 I/O DATA RS485
7 Ground and Shield
8 I -RESET RS485
9 n/c
10 n/c
11 n/c
12 n/c
13 Ground and Shield
14 I +24/+32 VDIRTY Depends on power supply (not used)
15 I Ground DIRTY
16 n/c
17 n/c
18 n/c
19 n/c
20 I GASFR (not used)
21 I CTSD (not used)
22 I TXDD (not used)
23 O RXDD (not used)
24 I +5 VDC
25 I +5 VDC

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the Tonometry module is limited to replacing faulty tubing or mechanical parts.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

CAUTION The module electronics can only be repaired and calibrated at the factory.

3.1.1 CO2 sensor

CAUTION The CO2 sensor can only be repaired at the factory. Attempts to repair the sensor
elsewhere will adversely affect operation of the sensor. The information provided is
for reference only.

3.1.2 Factory calibration data

CAUTION If there is any fault in the CPU board, pump unit, valve unit or CO2 sensor, the
module should be sent to the factory for repair. The CPU board contains calibration
data for the pressure transducers in the pump unit and valve unit. The CO2 sensor
preamplifier board contains calibration data for the sensor itself and for gas
measurement electronics on the CPU board.

3.1.3 Serviceable or exchangeable parts

• nafion tube
• other tubings
• tube unit
• mechanical parts
NOTE: After any component replacement see chapter Adjustments and calibrations.

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3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, APPENDIX A, which should be filled in when performing the
procedures.

The mark ? in the instructions means that the checklist should be signed after performing the
procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Screwdriver -
Pressure manometer -
Silicon tube 73373 Available in meters.
Calibration gas 755580
Calibration gas regulator 755534*
Calibration sampling line 733251
Air pressure gauge -
Luer plug
TonometricsTM catheter
See order numbers for accessories in the Patient Monitor Supplies and Accessories catalogue.
*NOTE: Ensure that the calibration gas and regulator are functioning properly before calibration.
Perform annual maintenance on the regulator as required. For more information see Adjustments
and calibrations chapter of Compact Airway modules slot.

3.2.2 Recommended parts

Part Order No. Notes
Special tube, (Nafion) 300 mm 733382

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Detach the module box by removing the two screws from the back of the module. Be careful with
loose latch and spring pin for locking.
1. Check internal parts:
− all screws are tightened properly
− all cables are connected properly
− tubes are not pinched and there are no sharp bends on them
− all tubes are connected properly

?
2. Check external parts:
− the front cover and the front panel sticker are intact
− connectors are intact and are attached properly
− the module box, latch and spring locking pin are intact

?
3. Replace the nafion tube.

NOTE: The nafion tube should be replaced annually.

?
− Reattach the module box and check that the latch moves properly.
− Plug in the module. Check that it goes in smoothly and locks up properly
− Turn the monitor on and wait until the normal monitoring screen appears.
− Configure the monitor screen so that information regarding the tonometric
measurement is shown, for example:
Monitor Setup - Screen 1 Setup - Digit Fields -Lower Field 4 - PgCO2
4. Check that the module is recognized, i.e. the PgCO2 header with related information appears
in the chosen digit field.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Record the information regarding the software of the tonometry module by selecting Scroll
Vers and turning the ComWheel.

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6. Enter the tonometric module service menu:

...Parameters - More... - TONO

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check that the memories of the module have passed the
internal memory test, i.e. ‘RAM’, ‘ROM’ and ‘EEPROM’ all state OK. Check that the general
error status, module pneumatics error status, module hardware error status and testbit
status are zero.

?
7. Check the front panel Start-Stop and Lab. Data membrane keys.
Press each key for at least one second and check that the key being pressed is identified,
i.e. the keyboard status changes.

?
8. Perform the pressure sensor calibration (TONO - PressSensCal), see instructions from
section 3.4.1.Pressure sensor calibration

?
9. Perform the system test (TONO - System Test).

1. Block the catheter port of the module airtight e.g. with a plug that is made for closing a
syringe.

2. Select Start Test.

3. Wait until the automatic test procedure is over. The results are given in the data field and
descriptions of the tested parts are listed in table 8, see section 5.4 System test.

The test can be interrupted at any time by selecting Stop Test.

NOTE: The system test takes about one minute to carry out.
NOTE: Use a plug with very small volume to block the catheter port.

?
10. Perform the gas calibration (TONO - Tonometry - PgCO2 Calibration).

?
11. Connect the catheter to the tonometry module. Start tonometric measurement by pressing
the Start-Stop key on the module.
If measurement is turned on PgCO2 time bat replaces the Meas Off text. Check that the
catheter fills up. Stop the measurement by pressing the Start-Stop key.

?
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12. Clean the module with suitable detergent.

?
Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the tonometry module in the following way. See also the exploded view of the
module.
1. Remove two screws from the back of the module.
2. Pull the module box slowly backwards and detach it from the main body.
Reassembling is essentially reversing what was described above.

CAUTION When reassembling the module, make sure that the tubes and cables are not
pinched between the boards and the cover.

3.3.1 Instructions after replacing tubings

After replacing any part of the tubings:
• perform the System test
• perform the PgCO2 calibration

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3.4 Adjustments and calibrations

3.4.1 Pressure sensor calibration

Before the procedure:
− Find out what the ambient pressure is at the moment in [mmHg] or [mbar].
− Find a device with which you can apply a known pressure of about 100 mmHg to the
catheter port. There are e.g. blood pressure gauges that will do. Make sure that it can
be connected to a male luer connector.
1. The monitor prompts: ‘Make sure that catheter connector is open to room air and start
calibration.’
− Remove catheter, plug, pressure gauge or anything that is connected to catheter port
of the module.
− Select Start Calib
2. The monitor prompts: ‘Calib started. Make sure that catheter connector is open to room air.’
− Remove catheter, plug, pressure gauge or anything that is connected to catheter port
of the module, if you haven’t done so already.
− Wait a moment.
3. The monitor prompts ‘Adjust ambient pressure.’
− Turn ComWheel to match the highlighted pressure value (or the corresponding value
in mbar to the right of the mmHg reading) to the known ambient pressure.
− Press ComWheel.
4. The monitor prompts: ‘Pump approximately 100 mmHg pressure and adjust cal. press. to
match.’
− Connect the blood pressure gauge to the catheter port.
− Pump in a pressure between 95 and 105 mmHg.
− Turn ComWheel to match the highlighted pressure value to the applied pressure.
− Press ComWheel.
5. The monitor prompts ‘Store or discard new sensor gains and offsets.’
− Turn ComWheel to display YES if you want to store the calibration factors or NO if you
do not want to store them.
− Press ComWheel.
6. The monitor prompts ‘Calibration finished.’
Everything went OK and the calibration is finished.
OR
The monitor prompts: ‘Calibration pressure too close to ambient pressure.’
The applied pressure was too small and you have to redo the calibration.

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3.4.2 System test

1. Plug the catheter port of the module airtight e.g. with a plug that is made for closing a
syringe.
2. Select Start Test.
3. Wait till the automatic test procedure is over. The results are given in the data field and
descriptions of the tested parts are listed in table 8, see section System test.
The test can be interrupted at any time by selecting Stop Test.
NOTE: The system test takes about one minute to perform.
NOTE: Use a plug with very small volume to block the catheter port.

3.4.3 PgCO2 calibration

The gas calibration is performed in the Others - Tonometry or ...Service - Parameters - More... -
TONO - Tonometry submenu.
1. Connect the calibration gas sampling line to the regulator and to the module’s catheter
connector.
2. Press the Others key on the monitor keyboard.
3. Select Tonometry - PgCO2 Calibration.
4. Wait until the text ‘Start feeding gas and press ComWheel. Feed gas until Adjust message is
displayed’ appears. Open the regulator and start feeding gas. Press the ComWheel and
continue feeding gas until the text ‘Adjust’ appears on the display.
5. Check that the displayed values match the values on the calibration gas container. Adjust
with the ComWheel if necessary.
6. It is recommended that the airway gases be calibrated at the same time.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Possible cause and treatment
Tonometry module HW error. Module hardware error. Return the module to the factory for repair.
Tonometrics catheter empty. There is no gas in the tonometry catheter. It will be filled automatically during
the next measurement. Occlusion in the catheter, or leak in the catheter or
connector in the module. Check catheter.
Tonometrics catheter leakage. The tonometry catheter is disconnected, the tubes are leaking inside the
module or the catheter is leaking. Ensure proper catheter connection and have
the internal leak repaired.
Unable to fill tonometrics Occlusion in the catheter or the balloon is squeezed. Check catheter.
catheter.

4.2 Gas sampling system troubleshooting

The faults which can occur in the sampling system are: leaks or blockages in the tubing, fault in
pressure sensors, failure of the sampling pump or the magnetic valves.
The system test should help in localizing the fault. Whenever suspecting the sampling system and
always after having done any work on the sampling system check and if necessary adjust the
pressure sensors.

CAUTION The special internal sample tube is mechanically fragile. Sharp bends will cause
leaks.

CAUTION If there is any fault in the CPU board, pump unit, valve unit or CO2 sensor, the
module should be sent to factory for repair. The CPU board contains calibration
data for the pressure transducers in the pump unit and valve unit.
NOTE: If any liquid has entered the module, contact Datex-Ohmeda Technical Services.

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password: 16-4-34).
3. Select Service (password: 26-23-8).
4. Select Parameters - More... - TONO.

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5.1 Tonometry service menu

Service Data
Tonometry A selection to enter the Tonometry setup menu.
PressSensCal A selection to enter the module pressure sensor calibration menu.
System Test A selection to enter the module system test.
CO2 Sensor A selection to enter the module CO2 sensor menu.
Pneumatics A selection to enter the module pneumatics menu.
AD A selection to enter the module AD value display.
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
Previous Menu A selection to return to the previous menu.

TONO
Statuses (HEX): See Appendix B; How to read HEX numbers.
General Module general status. See table 2 to see the detailed description of the message.
Table 2 Module general status
bit 0-5 Not used
bit 6 State error
bit 7 Communication failure
bit 8 Power failure
bit 9 Clock failure

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bit 10 EEPROM checksum failure

bit 11 EEPROM writing failure
bit 12 ROM failure
bit 13 RAM failure
bit 14 Test mode
bit 15 Init mode

HW Module hardware status. See table 3 to see the detailed description of the message.
Table 3 Module hardware status

bit 0 Lamp ON
bit 1 Stepper motor ON
bit 2 Zeroing valve ON
bit 3 Pump valve ON
bit 4-15 Not used

Module key Module keyboard status. See table 4 to see the detailed description of the message.
Table 4 Module keyboard status

bit 0 Button 1 (start/stop) pressed

bit 1 Button 2 (Lab.Data) pressed
bit 2-15 Not used

Error Statuses (HEX):

General error Module general error status. See table 5 to see the detailed description of the message.
Table 5 Module general error status

Bit Description Suggested service

bit 0-1 Not used. -
bit 2 Zeroing error. Zero gas signal out of limits or pressure or CO2 sensor faulty. Send the
temperature signal varying during measurement. module to the factory for repair.
bit 3 CO2 measurement error. CO2 signal out of limits or pressure or CO2 sensor faulty. Send the
temperature signal varying during measurement. module to the factory for repair.
bit 4 Measurement error. Sensor temperature, measurement CO2 sensor faulty. Send the
pressure or absorbance is out of limits. module to the factory for repair.
bit 5 Calibration error. Failure in calibration. Recalibrate.
bit 6 Pneumatic error. See pneumatic error status bits
for details.
bit 7 Lamp pulsing error. CO2 sensor faulty. Send the
module to the factory for repair.
bit 8-15 Not used. -

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Pneuma error Module pneumatics error status. See table 6 to see the detailed description of the message.
Table 6 Module pneumatics error status

Bit Error label Description Suggested service

0 pumping error Stepper motor is not able to generate Check the function of the stepper motor.
negative pressure at the pump pressure
sensor during zeroing.
1 eq. to amb. press failed Before filling the catheter, the pressure in the Calibrate the pressure sensors. Check the
module tubing is equilibrated to the ambient pump valve function.
pressure by switching the pump valve on and
off. If ambient pressure is not reached, this
error is shown.
2 tubing/zero block occl Pressure at the pump pressure sensor gets Check tubing/valves for occlusion.
too low, when air is aspirated though the
zeroing valve.
8 press sens values differ Pump pressure and catheter pressure Calibrate the pressure sensors.
readings differ more than 50 mbars.
9 pneuma fatal error This error is shown, if the pneumatic error Check for other pneumatics errors.
occurred is considered fatal.
10 cath press too low Catheter pressure reading is below Make sure that you are not applying too low
reasonable pressure values. pressure to the catheter connector. Calibrate
the pressure sensors.
11 cath press too high Catheter pressure reading is above Make sure that you are not applying too high
reasonable pressure values. pressure to the catheter connector. Calibrate
the pressure sensors.
12 pump press too low Pump pressure reading is below reasonable Make sure that you are not applying too low
pressure values. pressure to the catheter connector. Calibrate
the pressure sensors.
13 pump press too high Pump pressure reading is above reasonable Make sure that you are not applying too high
values. pressure to the catheter connector. Calibrate
the pressure sensors.

HW error Module hardware error status. See table 7 to see the detailed description of the message.
Table 7 Module hardware error status

bit 0 Lamp error

bit 1, 2, 3 not used
bit 4 CPU EEPROM error
bit 5 Sensor EEPROM error
bit 6 Internal AD converter error
bit 7 External AD converter error
bit 8 CO2 termopile error
bit 9 Reserved
bit 10 Temperature detector error
bit 11 Pump pressure sensor error
bit 12 Catheter pressure sensor error
bit 13 Pneumatic power failure
bit 14-15 Not used

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Testbit Testbit is module production phase test status and is always 0000 (HEX). If testbit status is ≠ 0000
then the module should be returned to the factory.
Voltages
Vdd; 5 V digital units driving voltage received from the module frame.
5vdc; 5 Volts of the module derived internally from 15vdc.
15vdc; 15 Volts of the module received from the module frame.
Pneuma voltage; 15 V voltage driving pneumatic elements of the module, derived from 15V dirty.
15V dirty; 15 V voltage received from the module frame.

5.2 Tonometry
Another route to reach Tonometry setup menu. See the description in User’s Reference Manual.

PgCO2 Calibration
See calibration instructions from section 3.4.3 PgCO2 calibration.

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5.3 Press sensor calibration

Press Sensor
Start Calib. A selection to start module pressure sensor calibration sequence. The procedure is guided online.
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
TONO
Amb Press; ambient pressure measured by the pressure sensor. All the pressure values are given
in both mmHg and mbar on this page.
Pump Press; pressure measured from the pumping unit.
Cath Press; pressure measured from the catheter line.
User Cal Press; pressure that user sets during the calibration sequence accorging to the pressure
that is applied to the catheter port. The set value should be close to 100 mmHg.
User Amb Press; pressure that user sets during the calibration sequence according to the current
ambient pressure in the room.
Store; a selection for storing/discarding the newly gained calibration values.
Last Press calibration date; data read from the module that tells when the module was last
calibrated.

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5.4 System test

System Test
Start Test A selection to start the automatic system test sequence. The procedure is guided online.
Stop Test A selection to stop the automatic system test sequence.
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
TONO
Cathpres; pressure measured from the catheter line [mbar].
Ambpres; ambient pressure in the room [mbar].
Pumppres; pressure measured from the pumping unit [mbar].
System test results; detailed information of the test results of different system parts. The meaning
of the messages:
− "OK" the part succesfully passed the test
− "FAIL" the part failed in the test
− "N/A" the test couldn't be carried out properly.
See table 8 to see the detailed description of the tested parts.
Table 8 Description of system test

Test label Description If test fails

Pump unit function Stepper motor aspirates/pushes room air through the Check the function of stepper
zeroing valve. If stepper is working properly, it is able to motor.
generate small negative/positive pressure at the pump unit
pressure sensor.

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Test label Description If test fails

Cath press = pump press Pump pressure sensor and catheter pressure sensor Calibrate the pressure sensors.
readings are compared at three pressures: at ambient
pressure, at approx. +100 mbar and –100 mbar.
Tubing leak test The air tightness of the module inner tubing from the zeroing Check tubing and connections for
valve to the pump valve is tested. leaks.
Pump unit leak test The air tightness of the pump unit is tested. Check pump unit for leaks.
Cath conn. leak test The air tightness of the zeroing unit and catheter connector Make sure, that the catheter
is tested. connector is properly closed during
the test. Check zeroing unit and the
catheter connector for leaks.
Block test Air is aspirated through the zeroing valve. If pressure at the Check the tubing/valves for blocks.
pump pressure sensor drops too much, the tubing/valves
from the zeroing valve to the pump pressure sensor is
blocked.
Zero valve function Module pneumatic system pressurised and then zeroing Check the function of the zeroing
valve is opened to the room air. If pressure does not drop, valve.
the zeroing valve may not be functioning.
Pump valve function Module pneumatic system pressurised and then pump Check the function of the pump
valve is opened to the room air. If pressure does not drop, valve.
the pump valve may not be functioning.

5.5 CO2 sensor

CO2 Sensor
Lamp ON/OFF A selection to toggle sensor lamp on and off.
Meas Signal A selection to start automatic signal measurement sequence. This sequence measures sensor
lamp signal levels.
Meas Zero A selection to start automatic zeroing measurement sequence.

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Meas Gas A selection to start automatic gas measurement sequence. This sequence first performs the zeroing
measurement. Then it measures the CO2 concentration of the sample of arbitrary gas aspirated
from the catheter port.
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
TONO
Calib gain; CO2 measurement gain factor that is set in calibration.
Lamp on current; sensor lamp current when lit.
Lamp off current; sensor lamp current when off.
Block temp; sensor temperature [°C] (in degrees centigrade).
Detector offset; CO2 detector offset voltage.
Lamp status; displays whether sensor lamp is on or off.
CO2 AD; signal from CO2 sensor thermopile (AD counts).
CO2 signal; thermopile signal maximum – minimum when lamp is blinked (AD counts).
CO2 zero; thermopile signal maximum - minimum during sensor zeroing when lamp is blinked (AD
counts).
CO2 absorbance; calculated light absorbance during CO2 measurement.
CO2 concentration; CO2 concentration (%) in sensor (does not include compensations related to
catheter measurement).
MEAS TEMP; CO2 sensor temperature during signal measurement [°C].
MEAS PRESS; CO2 sensor pressure during signal measurement [mbar].
ZERO TEMP; CO2 sensor temperature during zeroing measurement [°C].
ZERO PRESS; CO2 sensor pressure during zeroing measurement [mbar].

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5.6 Pneumatics

Pneumatics
Zero valve A selection to toggle zero valve on/off.
Press valve A selection to toggle pump valve on/off.
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
TONO
Cathpres; pressure measured from the catheter line [mbar].
Ambpres; ambient pressure in the room [mbar].
Pumppres; pressure measured from the pumping unit [mbar].
Pneuma Power; displays whether electricity has been connected to the pneumatics system or not.
Zero valve; displays whether zero valve is on or off.
Pump valve; displays whether pump valve is on or off.
Gas removed count; displays how many times gas is removed from catheter during measurement
cycle.
Pneumatic errors; detailed information of the performance of different pneumatics system parts.
The meaning of the messages:
‘NO’ the part performed OK during the measurement = "this error did not occur"
‘YES’ the part failed during the measurement = "this error did occur."
See table 6 to see the detailed description of the tested parts.

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5.7 AD

AD
Record Data A selection to print out the shown service data to the device defined in the ...Service - Record Data
menu.
TONO
All the numbers in this section are AD counts, i.e. computer internal data.
EXTERNAL ADC
CO2; CO2 sensor CO2 signal.
temp; CO2 sensor temperature signal.
cath press; pressure measured from the catheter line.
pump press; pressure measured from the pumping unit.

INTERNAL ADC
VDD; 5 V digital units driving voltage received from the module frame.
5V; 5 Volts of the module derived internally from 15vdc.
15V; 15 Volts of the module received from the module frame.
pneuma voltage; 15 V voltage driving pneumatic elements of the module, derived from 15 V dirty.
CO2 det offset; CO2 detector offset voltage.
lamp current; CO2 sensor lamp current.
15V dirty; 15 V voltage received from the module frame.

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6 SPARE PARTS

6.1 Spare parts list

NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories catalogue.

6.1.1 Tonometry Module, rev. 00, 01

5

Figure 7 Exploded view of S/5 Tonometry Module, M-TONO

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Membrane key 896015
6 Hose-plastic,d=2/hole 1,transluc.vin 73341
7 Hose-silicor,hole 1.7/wall 1.05 73373
8 Nafion tubing, 300mm 733382
9 Pipe 10mm 871925
10 Tube unit 896981
11 Front Panel sticker, DA ; M-TONO (rev.00) 897739 898873
11 Front Panel sticker, DA ; M-TONO (rev.01) ; S/5 898873

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Item Description Order No. Replaced by

11 Front Panel sticker, DE ; M-TONO (rev.00) 897730 898864
11 Front Panel sticker, DE ; M-TONO (rev.01) ; S/5 898864
11 Front Panel sticker, EN ; M-TONO (rev.00) 895683 898863
11 Front Panel sticker, EN ; M-TONO (rev.01) ; S/5 898863
11 Front Panel sticker, ES ; M-TONO (rev.00) 897733 898867
11 Front Panel sticker, ES ; M-TONO (rev.01) ; S/5 898867
11 Front Panel sticker, FI ; M-TONO (rev.00) 897736 898870
11 Front Panel sticker, FI ; M-TONO (rev.01) ; S/5 898870
11 Front Panel sticker, FR ; M-TONO (rev.00) 897731 898865
11 Front Panel sticker, FR ; M-TONO (rev.01) ; S/5 898865
11 Front Panel sticker, IT ; M-TONO (rev.00) 897734 898868
11 Front Panel sticker, IT ; M-TONO (rev.01) ; S/5 898868
11 Front Panel sticker, JA ; M-TONO (rev.00) 897740 8000385
11 Front Panel sticker, JA ; M-TONO (rev.01) ; S/5 8000385
11 Front Panel sticker, NL ; M-TONO (rev.00) 897732 898866
11 Front Panel sticker, NL ; M-TONO (rev.01) ; S/5 898866
11 Front Panel sticker, NO ; M-TONO (rev.00) 897738 898872
11 Front Panel sticker, NO ; M-TONO (rev.01) ; S/5 898872
11 Front Panel sticker, PT ; M-TONO (rev.00) 897735 898869
11 Front Panel sticker, PT ; M-TONO (rev.01) ; S/5 898869
11 Front Panel sticker, SV ; M-TONO (rev.00) 897737 898871
11 Front Panel sticker, SV ; M-TONO (rev.01) ; S/5 898871

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7 EARLIER REVISIONS
Revision Manual slot Note
Tonometry Module, M-TONO, rev. 00 896 621 In main manual 896 624

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APPENDIX A, SERVICE CHECK FORM

APPENDIX B, HOW TO READ HEX NUMBERS

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APPENDIX A, SERVICE CHECK FORM

S/5 Tonometry Module, M-TONO

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Nafion tube 4. Recognition

Notes

5. Module software TONO

OK N.A. Fail OK N.A. Fail
6. Communication and 7. Membrane keys
memories
8. Pressure sensor 9. System test
calibration
10. Gas calibration 11. Measurement

12. Cleaning

Notes

Used Spare Parts

Signature

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APPENDIX B, HOW TO READ HEX NUMBERS

Some statuses on Tonometry Module service pages are given as HEX (hexadecimal) numbers. To
understand them, please read the following:
A HEX number has a base of 16 instead of 10. This means that every character in a number can
have a value between 0 and 15. Numbers from 0 to 9 are displayed as if they were normal 10-
based numbers. Numbers from 10 to 15 are displayed with letters from a to f or A to F respectively.
Every character of a HEX number expands into a binary code of four 0:s (zeroes) and 1:s (ones) as
given in table 9. Four successive characters thus expand into four times four binary numbers.
Here's an example:
We have a HEX number F3A1. We expand the number into binary code so that we first take the four
binary digits that correspond to F, which are 1111. Then we write the four binaries that correspond
to 3 (0011) after the first four. We now have 11110011. And so on.
Eventually, we have a string of 16 binary numbers, so called bits. HEX number F3A1 corresponds to
a binary code of 1111 0011 1010 0001. Spaces are added here for legibility and to visualize the
fact that every group of four bits corresponds to one HEX character.
The bits in a binary number are numbered from right to left always starting from 0 as follows:
bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0
1 1 1 1 0 0 1 1 1 0 1 0 0 0 0 1

With this information and a table of status fields from section 5 “SERVICE MENU” we can translate
a HEX status code into actual status messages. If a bit is 1 this means that the corresponding
status/error condition is valid, whereas a 0 means that it is not.
Table 9 HEX to binary conversion

HEX binary HEX binary

0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111

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2(2))
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 Datex-Ohmeda
S/5TM EEG Module, M-EEG (rev. 01)
S/5TM EEG Headbox, N-EEG (rev. 01)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8001011-4

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
EEG Module, M-EEG and EEG Headbox, N-EEG
TABLE OF CONTENTS I
TABLE OF FIGURES II
INTRODUCTION 1
1 SPECIFICATIONS 2
1.1 General specifications ..............................................................................................................................2
1.1.1 Headbox ..........................................................................................................................................2
1.1.2 Module ............................................................................................................................................2
1.2 Technical specifications............................................................................................................................2
1.2.1 EEG .................................................................................................................................................2
1.2.2 AEP..................................................................................................................................................3
1.2.3 EMG ................................................................................................................................................3
1.2.4 Impedance measurement.................................................................................................................3
2 FUNCTIONAL DESCRIPTION 4
2.1 Measurement principle .............................................................................................................................4
2.1.1 EEG .................................................................................................................................................4
2.1.2 FEMG...............................................................................................................................................4
2.1.3 AEP..................................................................................................................................................4
2.1.4 Impedance measurement.................................................................................................................5
2.2 Main components.....................................................................................................................................5
2.2.1 Neuro board.....................................................................................................................................5
2.2.2 Headbox board.................................................................................................................................6
2.3 Connectors and signals.............................................................................................................................7
2.3.1 Module bus connector ......................................................................................................................7
2.3.2 Module front panel connectors..........................................................................................................8
2.3.3 Headbox input connector..................................................................................................................8
3 SERVICE PROCEDURES 9
3.1 General service information.......................................................................................................................9
3.2 Service check .........................................................................................................................................10
3.2.1 Recommended tools ......................................................................................................................10
3.3 Disassembly and reassembly..................................................................................................................14
3.3.1 M-EEG ...........................................................................................................................................14
3.3.2 N-EEG............................................................................................................................................14
4 TROUBLESHOOTING 15
4.1 Troubleshooting chart .............................................................................................................................15
4.2 Troubleshooting flowcharts......................................................................................................................16
5 SERVICE MENU 18
5.1 EEG & EP service menu ...........................................................................................................................19
6 SPARE PARTS 23
6.1 Spare part list.........................................................................................................................................23
6.1.1 M-EEG rev. 00, 01..........................................................................................................................23

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6.1.2 N-EEG rev. 00, 01 ..........................................................................................................................25

7 EARLIER REVISIONS 27
APPENDIX A 29
SERVICE CHECK FORM A-1

TABLE OF FIGURES
Figure 1 Measurement setup ............................................................................................................................. 1
Figure 2 Neuro board block diagram .................................................................................................................. 5
Figure 3 Audio stimulator circuitry ...................................................................................................................... 6
Figure 4 EEG headbox board block diagram........................................................................................................ 6
Figure 5 EEG module troubleshooting flowchart ................................................................................................16
Figure 6 Headbox troubleshooting flowchart .....................................................................................................17
Figure 7 Exploded view of module box and EEG module ....................................................................................23
Figure 8 Exploded view of headbox...................................................................................................................25

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 EEG Module, M-EEG and Datex-Ohmeda S/5 EEG Headbox, N-EEG. The EEG
module is a single width plug-in module designed for use with the S/5 monitors. Later in this
manual modules may be refered to without the S/5 system nomenclature for simplicity.
Please also refer to the Technical Reference Manual of the S/5 monitor for information related to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.
The EEG module and the EEG headbox together measure:
• electroencephalography (EEG)
• spontaneous facial muscular activity with frontal electromyography (FEMG)
• auditory evoked potentials (AEP)
The EEG Headbox, N-EEG, is responsible for EEG and FEMG signal amplification, filtering and
digitization and electrode impedance measurement. It is situated close to the patient’s head. The
Headbox has connectors for the EEG leads, either for a referential or a bipolar montage, and for the
AEP stimulation earphones.
The EEG module M-EEG creates auditory stimulus pulses and takes care of AEP signal processing.
It has one connector for the EEG headbox.

Figure 1 Measurement setup

(1) Module EEG, EP and FEMG measurement capability, M-EEG

(2) EEG Headbox and cable, N-EEG
(3) EEG leadset: preconfigured or own montage
- EEG electrodes (cup, needle or stick-on)
For AEP, earphones (4) are required.
NOTE: The S/5 EEG Module, M-EEG and Headbox N-EEG functions only with monitor software of
level 99 or newer.

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1 SPECIFICATIONS

1.1 General specifications

1.1.1 Headbox
Box size, W × D × H 96 × 170 × 34 mm/3.8 × 6.7 × 1.3 in
Box weight 0.5 kg/1.1 lbs
Power consumption 1.9 W

1.1.2 Module
Module size, W × D × H 37 × 180 × 112 mm/1.5 × 7.1 × 4.4 in
Module weight 0.37 kg/0.8 lbs
Power consumption 3.1 W

1.2 Technical specifications

1.2.1 EEG
Amplification 10 000
Resolution 60 nV
Max amplitude 800 µVpp
Sampling frequency 100 Hz per channel
Range ±400 µV
Frequency range 0.5...30 Hz
Input impedance 8 MΩ @ 10 Hz
Noise level <0.5 µV rms from 0.5 Hz to 30 Hz
CMRR >100 dB @ 50 Hz
Parameters from power spectrum SEF, MF, relative power in frequency bands
Burst suppression calculated burst-suppression ratio (BSR)
Defibrillation protection 5000V, 360 J
Allowable Input Offset ±300 mV

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1.2.2 AEP
Amplification 10 000
Resolution 60 nV
Max amplitude 1000 µVpp
Stimulation
Click (condensating) duration 100 µs
Frequency 1.1...9.1 Hz (1 Hz steps) @ 10 ms measurement
1.1...8.1 Hz (1 Hz steps) @ 100 ms measurement
Intensity 10...90 dB nHL, 10 dB steps
Measurement
Sampling frequency 2400 Hz for MLAEP/ 4800 for BAEP
Frequency range 0.5...1000 Hz
Highpass filter off/10/30/50/75/100/150 Hz
Single average:
Averaged responses 100...2000 stimuli
Moving average:
Gross average 100...2000 stimuli
Update interval after every 100 stimuli (200, when gross average is 2000)

1.2.3 EMG
Amplification 50 000
Resolution 100 nV
Max amplitude 100 µVpp
Frequency range 60...300 Hz
Amplitude Root Mean Square (RMS)

1.2.4 Impedance measurement

Measurement frequency 75 Hz
Current 10 µA
Range 0...30 kΩ
Resolution 100 Ω
Accuracy ±1k or ±10 % whichever is greater
Measurement time, all leads 3s
Start of measurement manual/automatic
Leads off detection >3 MΩ, continuous

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 EEG
EEG is a differential voltage signal measured from electrodes attached to the patient’s skin. EEG
measures the spontaneous electrical activity of the brain. This electrical activity reflects the state of
the brain.
Electrode connections can be made with two different principles: bipolar or referential montage. In
bipolar montage every channel has two electrodes and the signal is the potential difference
between these two electrodes. In a referential montage the referential electrode delivers its
potential to every channel’s minus-input. The signal is the potential difference between this
common reference electrode and the electrode connected to the plus input. The purpose of the
ground electrode is to reduce common mode noise. It cannot be used as referential electrode.

Bipolar connection Referential connection

The EEG signal is amplified, antialias filtered, digitized and software filtered. After that the EEG
signal is displayed on the screen and various characteristics are calculated from it. These include
spectrum, rms amplitude, spectral edge frequency, median frequency, burst-suppression ratio and
percentage of total power in four different bands: theta (1...4 Hz), delta (5...9 Hz), alpha (9...13 Hz)
and beta (>13 Hz).

2.1.2 FEMG
FEMG is electrical signal originating from facial muscles. In the headbox the signal of channel 1 is
divided into two different amplification and filtering paths. One is the EEG path and the other is the
FEMG path. The FEMG signal has a much broader spectrum than the EEG and it overlaps with the
EEG at low frequencies. Because of this the rms amplitude of FEMG signal is calculated from the
frequency band 60...300 Hz. Mains power frequency and its harmonics are digitally filtered away
to reject noise interference from power lines.

2.1.3 AEP
AEP is an electrical response of the nervous system to external auditory stimulus. It is measured
using the same electrodes as in the EEG measurement, but the sampling frequency and bandwidth
are different. The electrical signal resulting from one stimulus is weaker than the spontaneous

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activity of the brain. To overcome this the stimulus is repeated several times (100...2000), and an
average of all responses is calculated. Responses containing large artefacts are removed from the
average to improve the signal to noise ratio.

2.1.4 Impedance measurement

The impedance measurement is performed from one channel at a time and the EEG or EP
measurement is stopped during the impedance measurement.
Differences in electrode impedance causes common mode noise coupling to the measured signal.
To minimize this the electrode impedance is measured and a warning of unsatisfactory impedance
level is generated when necessary. The impedance of an electrode is measured by applying a
known current through the electrode and measuring the voltage drop over the electrode. This way
the impedance of a single electrode can be resolved instead of a sum impedance of an electrode
pair.

2.2 Main components

2.2.1 Neuro board

The Neuro board consists of the following functional sections:
• audio stimulator
• microprocessor for stimulation and measurement control, and for counting the
measurement results
• two serial communication drivers
The serial bus speed to monitor is 500 kbps and the bus itself is half duplex, i.e. data can be
transferred to both directions but only one way at a time.
The serial bus speed to the headbox is 500 kbps and the bus is full duplex i.e. data can be
transferred to both directions at the same time.

Module
Power Power ±5 V Keys
+15 V supply ±12V +15 V
Patient Isolation 5 kV

Data To
EEPROM
Module Bus

CPU RS-422 EEG

3048 driver Head-
AEP stimulus box
RAM

Reset
Opto RS485
Data Isolation Driver AEP
Stimulator

Figure 2 Neuro board block diagram

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Earphones

PWM Audio level

adjustment
H83048 Audio
generator Headbox
CTRL Timing
control

Figure 3 Audio stimulator circuitry

2.2.2 Headbox board

The Headbox board consists of the following functional sections:
• input protection
• EEG amplifiers and filters
• FEMG amplifier and filter
• current feeding circuitry and amplifiers for impedance measurement
• microprocessor
• serial communication

Power ±5 V
+15 V supply ±12V
Isolation kV

1 p
A a
CPU EEG
/ t
3048 signal
D i
RS 1-4 1-4
Data Opto e
422
AEP n
AEP stimulus Isolation driver
stimulus t
Impedance
Headbox check
Keys

Figure 4 EEG headbox board block diagram

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Table 1 Module bus connector (X1) pin description

Pin No. I/O Signal

1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 - Ground & Shield
8 I -RESET_RS485
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 - Ground & Shield
14 I +32 VDIRTY
15 I GroundDIRTY
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 - ON/STANDBY
21 - PWM_ECG
22 - RXDD_RS232
23 - TXDD_RS232
24 I +5 VDC
25 I +5 VDC

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2.3.2 Module front panel connectors

Table 2 Headbox connector

Pin No. Signal

1 Ground
3 6 2 Ground
1
4 7
9 3 +15 V
2 0 4 TXD+
5 8
5 EP Audio
6 Power sync 43 kHz
7 RXD+
8 EP Sync
9 RXD-
0 TXD-

2.3.3 Headbox input connector

Table 3 Headbox input connector

1 5
6 10

Pin No. Signal

1 Lead set id
2 1+
3 2+
4 3+
5 4+
6 Ground
7 1- / Ref
8 2-
9 3-
10 4-

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-EEG and N-EEG is limited to replacing faulty circuit boards or mechanical
parts. Faulty circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
The Datex-Ohmeda EEG Simulator (order No. 90502) is recommended for functional checks.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service check is
recommended to be performed after any service repair. However, the service check procedures can
also be used for determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, Appendix A, which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
EEG simulator 90502
Screwdriver
Earphones

• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring pin for locking.
• Detach also the cover of the EEG headbox by removing the four screws from the bottom of the
box. Be careful with the two wired connectors in the circuit board attached to the cover.
1. Check internal parts of the module and the headbox:
− screws are tightened properly
− cables are connected properly
− the EMC cover is attached properly in the module
− there are no loose objects inside the module or the headbox

?
2. Check external parts of the module:
− the front cover and the front panel sticker are intact
− connectors are intact and are attached properly
− the module box, latch and spring pin for locking are intact

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3. Check external parts of the headbox

− cover and the base of the headbox are intact
− the headbox sticker is intact
− connectors are intact and attached properly

?
• Reattach the module box and the cover of the EEG headbox.
• Turn the monitor on and wait until the normal monitoring screen appears.
• Configure the monitor screen so that information regarding the EEG measurement is shown:

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - EEG1

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 2 - EEG2
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 3 - EEG3
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 4 - EEG4
Others - EEG - Montage - EEG Channels - 4
Others - EEG - Montage - Montage type - Bip
Others - EEG - EEG Setup - Numeric 1 - MF
Others - EEG - EEG Setup - Numeric 2 - Ampl.
4. Plug in the module. Check that it goes in smoothly and locks up properly

?
5. Check that the module is recognized, i.e. the EEG header with related information appears in
the chosen waveform fields and ‘Headbox off’ message is shown on the four fields.

?
6. Connect the headbox to the module. Check that the headbox is recognized i.e. message ‘EEG
measurement off’ is shown on the four waveform fields. If the EEG leads are connected ‘EEG
measurement off’ message disappears after 15 seconds.

?
7. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Record the information regarding the software of M-EEG and N-EEG by selecting SCROLL
VERS and turning the ComWheel.

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8. Enter the EEG module service menu:

Parameters - More… - EEG & EP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values in the module view
are not increasing faster than by 5 per second. Check that the memories of the module have
passed the internal memory test, i.e. ‘RAM’, ‘ROM’ and ‘EEPROM’ all state OK.

?
9. Check that the ‘HB Mod Timeouts’, ‘HB Mod Bad Checksum’ and ‘Mod HB Bad Checksum’
values are not increasing faster than by 5 per second. Check that the memory of the headbox
has passed the internal memory test, i.e. ‘HB Rom Error’ in the headbox view
states 0.

?
10. Check the EP Start/Stop and Imp. Check membrane keys both of the module and the
headbox. Go to module view and press each key for at least one second and check that the
key being pressed is identified, i.e. the corresponding text is highlighted in the service menu.
Repeat in headbox view with headbox keys.

?
11. Select 10 kΩ as imped. pos. and imped. neg. value on the simulator. Go to EEG & EP service
menu and select Check Electr. From the headbox view check that the impedances in all four
channels are 10 kΩ ±1 kΩ.

?
12. Connect the EEG simulator to the headbox. Select 2 kΩ as imped. pos. and imped. neg.
value on the simulator. Select 10 Hz 200 µV sinewave on the simulator and check that all the
four waveforms have same form. Check that the size of the waveforms is 200 µVpp ±5 µV.
Check that the MF value is 10 ±0.5 Hz. Check that the amp value is 71 µV ±3 µV.

?
13. Select 75 Hz 50 µV signal on the simulator. Check that the FEMG value is 16 ±3 µV.

?
• Preset the AEP measurement settings:
Others
EP - Cycle - Cont.
EP - AEP Setup - AEP Channels - 2
EP - AEP Setup - Responses -100
EP - AEP Setup - Stim. Frequency - 1.1Hz
EP - AEP Setup - Stim. Intensity - 60 dB
EP - AEP Setup - Sweep length - 100 ms

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14. Plug in the earphones to the headbox. Be careful with load stimulation from the earphones
when starting AEP stimulation. Start AEP stimulation by pressing the EP Start/Stop button
on the module. Check that the clicking sound comes from the earphones in 1.1 Hz frequency.
Stop the stimulation by pressing again the EP Start/Stop button on the module. Check that
the clicking stopped.

?
• Modify the AEP measurement settings:
Others
EP - AEP Setup - Stim. Frequency - 8.1Hz
EP - AEP Setup - Stim. Intensity - 90 dB
EP - EP Size - 1
15. Connect the AEP testing cable between the simulator and the headbox. Select 2 kΩ as
imped. pos. and imped. neg. value on the simulator. Select 40 µV amplitude in the EP waves
menu on the simulator and start AEP measurement in the Others - EP menu. Wait until you
get the response on the display. Check that the shape of the response is one period of a sine
wave. Save EP and adjust the markers to minimum and maximum level of the response curve
in both channels. Check that the amplitude is 40 µV ±5 µV.

?
16. Perform an electrical safety check and a leakage current test.

?
17. Check that the module functions normally after performing the electrical safety check.

?
18. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

3.3.1 M-EEG
Disassemble the M-EEG in the following way. See Figure 7 Exploded view of module box and
EEG module
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose
latch and spring locking pin.
3. Detach the Neuro board by removing the two screws located near the front panel frame,
disconnect the cable and pull out the front panel frame.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected
properly.

3.3.2 N-EEG
Disassemble the N-EEG in the following way. See Figure 8 Exploded view of headbox.
1. Remove the four screws from the bottom of the headbox.
2. Lift off the cover and disconnect the two cables connected to the EEG headbox board.
3. Disconnect the module-headbox cable and the headbox input unit connectors from the EEG
headbox board.
4. Remove the four screws on the corners of the EEG headbox board and detach the EEG
headbox board.
To reassemble the N-EEG, reverse the order of the disassembly steps.

CAUTION When reassembling the headbox, make sure that the cables are reconnected
properly.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Cause Treatment
No EEG waveforms on screen. EEG waveforms not selected on screen. Press Monitor Setup key and select EEG
waveforms on the screen.
No EEG waveforms on screen and ‘EEG Electrodes not attached properly to skin or Check electrodes and electrode cables.
measurement off’ message shown in the electrode cables not connected to headbox.
number field.
All EEG Waveforms not drawn on screen The number of channels chosen on montage Check that the number of channels in menu
even if electrodes and cables are OK. setup is smaller than the number of Others -EEG - Montage is same as the
channels connected to patient. number of channels connected to patient.
Number fields show ‘---‘ and message ‘High Patient has high muscle activity in the head Relax the patient or remove the noise
EMG’ is displayed. region or noise from some equipment is source.
coupling to electrode cables.
EEG signal looks noisy and artefact message Electrodes are poorly connected or electrical Check the electrodes and electrode
is displayed in the number fields. interference is coupling to electrode cables. impedances. Remove noise sources if
necessary.
Leads off message is shown on other The montage chosen in monitor is not Change the montage to referential from
channels than channel 1 in referential referential. monitor menu Others -EEG - Montage.
connection.
Electrode impedance measurement is not EEG measurement is off. EEG measurement starts 15 seconds after
available on menus. first electrode pair is connected.
Electrode impedance measurement is not EP measurement is on. Wait until EP measurement ends or stop EP
available on menus. measurement.
Electrode impedances show ‘---‘ and check Ground electrode is poorly connected to Check the electrode and cable. If the
ground electrode message is displayed on patient or ground electrode cable is not electrode has too high impedance (>50k)
number fields after impedance connected to headbox. the measurement fails even if the electrode
measurement. is properly attached. Cure for this is to use
better electrodes or prepare the skin better.
Electrode impedances show ‘---‘ The electrode impedances are too high and Prepare the skin better or use better
out of measurement range. electrodes.
Start EP measurement not available on EP The EEG measurement is off. Connect electrodes and wait 15 seconds
menu. and the measurement starts.
EP measurement parameters cannot be The EP measurement is on. Stop EP measurement.
changed.
All or most of the EP epochs are rejected The signal has too much noise/artefacts in Check that electrode impedances are below
(Rej. counter on EP screen increases more EP measurement band. Especially coupled 5k and the impedances of the same
rapidly than Ave. counter). 50/60 Hz is not shown on EEG waveform channel are close to one another. If this
because of filtering, but may be present in does not help then try to remove noise
EP signal. sources.
EP wave is shown only on one channel even Leads are off in the channel where the EP Check the electrodes and electrode cables.
if two channels EP measurement is selected. wave is not shown.
No clicks can be heard from earphones. The earphones connector is not in place. Check that the earphones plug is firmly
pushed into the headbox’s earphone
connector.

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4.2 Troubleshooting flowcharts

Probably faulty Take all modules
EEG Module out of the frame.

Insert M-EEG and

turn power on

Does No Fault not in EEG

fault still
appear? module

Yes
Enter the EEG
Service menu
No
Check are the Timeouts,
Bad checksums or Bad
c-s by mod running?

No Does another
OK? module work in
the same
Yes slot?
Check RAM, ROM
and EEPROM
Yes

Replace
OK? No
Neuro board

Yes
Connect headbox
into
module connector
Yes

Check from headbox

view are the Timeouts,
HB Mod Bad
Checksums or Mod Hb
Bad Checksums running

No Does another No Fault not in EEG

OK? module work with module
headbox?
Yes
Check front panel
key functions

No Is the keypad No Connect the

OK?
connected? keypad

Yes

Does the
test pass with Yes Replace the
another keypad
Yes keypad?

No

Replace Neuro
EEG_module_trblsh_chart.vsd

board
Connect earphones into
the headbox and start
No
AEP measurement

No Can clicks be Yes Fault not in EEG

Can clicks heard with another module
be heard? headbox?

Figure 5 EEG module troubleshooting flowchart

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 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG

Possibly faulty EEG Take all modules

headbox out of the frame

Insert M-EEG and EEG on

headbox and turn power

Does
fault still No Fault not in EEG
appear? headbox

Yes
Does the
headbox work Yes
with another
module?

No
Enter the EEG
Service menu

Check from headbox view if the

Timeouts, HB Mod Bad Checksums or
Mod Hb Bad Checksums are running
Try with another
No headbox - module Fault in Yes Replace the
OK? cable or check the headbox - module
cable?
cable by hand cable
Yes
Check HB
Rom Error No

No
OK? Replace the
Headbox board
Yes
Check front panel
key functions

Is the
No No Connect
OK? keypad
connected the keypad
?

Yes
Yes
Does the
test pass Yes Replace
with another the keypad
keybad?

Connect earphones into No

the headbox and start
AEP measurement Replace Yes
Neuro board
Is earphone jack
intact and
Can Try with another headbox
No Fault in No connected to
clicks be - module cable or check
cable? heardbox circuit
heard? the cable by hand board?
Yes No
Yes
Check EP waveforms Replace the headbox Connect or replace
with EEG simulator - module cable the earphones jack
Yes

Try with another headbox -

EEG_headbox_trbls_chart.vsd

OK No Fault in No Replace Neuro

module cable or check the
? cable? board
cable by hand
Yes
Check EEG waveforms, FEMG
reading, impedance measurement and Replace the input
lead off detection with EEG simulator connector
No
Check the headbox Yes
OK? Replace the
T input connector and OK?
Headbox board
e input board
xt

Figure 6 Headbox troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Press the Monitor Setup key - select Install/Service (password: 16-4-34) - select Service
(password: 26-23-8) - select Parameters - More... - EEG & EP.

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5.1 EEG & EP service menu

EEG & EP
Check Electr. Headbox measures impedance of electrodes. Works same way as from EEG menu or
headbox/module button.
Start AEP AEP measurement is started with current AEP settings.
Module Service data is changed to module view (some of the data in this view is though from headbox).
Measurement shows whether the EEG measurement is ON or OFF. Measurement should start by
itself when the leads have been on about 15 seconds.
Montage shows the active montage in monitor.
HB Montage shows the montage attached to headbox. 0 means no montage, 1 basic, 2 general,
3 AEP, 4 Mont4 etc. up to 8, which means Mont8.
Montage type shows whether the montage is bipolar or referenced.
EP Start/Stop is highlighted when the EP Start/Stop button is pressed in headbox or module.
Imp. Check is highlighted when the Imp. Check button is pressed in headbox or module.
Imp. Meas. shows 1 if the impedance measurement is on in the module.
Headbox Off shows 1 if the headbox cable is not connected to module.
EP Meas. shows 1 if the evoked potential measurement is active in module.
Sending EP shows 1 if the module has acquired 100/200 new epochs and is sending them to
monitor.
Par. Error shows 1 if the evoked potential parameters active in module are conflicting with each
other.
Reserved 1 is reserved for future use.
Reserved 2 is reserved for future use.

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HB Mod Timeouts is a cumulative number that indicates how many times the headbox has not
responded to module’s inquiry.
HB Mod Bad Checksum is a cumulative number that indicates how many times there has been an
error in the message from headbox to module.
Mod HB Bad Checksum is 1 if there has been errors in the messages from module to headbox.
Mod Mon Timeouts is a cumulative number that indicates how many times the module has not
responded to monitor’s inquiry.
Mod Mon Bad Checksum is a cumulative number that indicates how many times there has been
an error in the message from module to monitor.
Mon Mod Bad Checksum is a cumulative number that indicates how many times there has been
an error in the message from monitor to module.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is accordance with the one the software has
calculated.
EEPROM indicates if the values stored in permanent memory are valid.
The states in memory checks are OK, Fail or ? (module not in place or a communication error).
Headbox Service data is changed to headbox view.

EP Start/Stop is highlighted when the EP Start/Stop button is pressed in headbox or module.

Imp. Check is highlighted when the Imp. Check button is pressed in headbox or module.
Active shows 1 if the channel is active.
Lead off+ shows the lead off status of all plus electrodes. 0 means that the lead is on and 1 that
the lead is off.
Lead off- shows the lead off status of all minus electrodes. 0 means that the lead is on and 1 that
the lead is off.
Imped+ shows the impedance of plus electrodes of last impedance check in all channels.
Imped- shows the impedance of minus electrodes of last impedance check in all channels.

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BSR shows the burst-suppression classification of EEG waveforms. 0 means artifact, 1

suppression, 2 burst and 3 invalid (the EEG is not classified).
Artefact shows the artefact status of all channels. 0 means that there are no artefacts on the signal
and 1 means that there are artefatcs.
Noise shows 1 if the activity of FEMG is too high for clean EEG signal and that EEG is not probably
reliable.
EMG AD shows the latest AD conversion result of FEMG signal without any filtering or scaling.
Leadset AD shows the latest AD conversion result of lead set signal without any scaling.
Bipolar shows the montage type that is active in module and headbox. 1 means bipolar and 0
referenced.
60 Hz is 1 if the power frequency filter is set for 60 Hz power frequency.
Imp. Meas. shows 1 if the impedance measurement is on in the headbox.
Imp. Check Failed shows 1 if the impedance check has failed.
EP Meas. shows 1 if the evoked potential measurement is active in headbox.
High EP Sampl. Rate shows 1 if the headbox uses higher sampling rate for 10 ms EP
measurement.
EP Epoch Points shows the number of samples collected for each epoch.
EP Channels shows the number of channels used in EP measurement.
Hb ROM Error is 1 if the checksum at the EPROM is not accordance with the one the software has
calculated.

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Setup

The items in setup menu are collection of items in normal EEG and EP menus. There are no special
service settings in this menu.
Imp. Cycle Impedance measurement repetition time.
Select Montage Selection of headbox’s electrode configuration.
EEG Channels Number of active channels in EEG measurement.
Montage Type Selection of bipolar (Bip)/referenced (Ref) montage.
Cycle EP measurement repetition time.
Stim. Frequency Ep measurement’s stimulation frequency.
Stim. Intensity Intensity of EP stimulus.

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 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG

6 SPARE PARTS
6.1 Spare part list
NOTE: Accessories are listed in the Patient monitor and supplies catalogue.

6.1.1 M-EEG rev. 00, 01

Figure 7 Exploded view of module box and EEG module

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Neuro board, ( M-EEG) 898806
6 Cross cylinder-head scerw M3x12 628700
7 Front mask unit, M-EEG (rev.00-01) 896484
8 Membrane keypad 880101
9 EEG input board 896571
10 Metal frame 879184
11 Cross cylinder-head screw M3x6 61721
12 Front Panel sticker, DA ; M-EEG (rev.00) 897344
12 Front Panel sticker, DA ; M-EEG (rev.01) ; S/5 898693
12 Front Panel sticker, DE ; M-EEG (rev.00) 897345 898684
12 Front Panel sticker, DE ; M-EEG (rev.01) ; S/5 898684
12 Front Panel sticker, EN ; M-EEG (rev.00) 897343 898683
12 Front Panel sticker, EN ; M-EEG (rev.01) ; S/5 898683
12 Front Panel sticker, ES ; M-EEG (rev.00) 897346 898687
12 Front Panel sticker, ES ; M-EEG (rev.01) ; S/5 898687

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Item Description Order No. Replaced by

12 Front Panel sticker, FI ; M-EEG (rev.00) 897347 898690
12 Front Panel sticker, FI ; M-EEG (rev.01) ; S/5 898690
12 Front Panel sticker, FR ; M-EEG (rev.00) 897348 898685
12 Front Panel sticker, FR ; M-EEG (rev.01) ; S/5 898685
12 Front Panel sticker, IT ; M-EEG (rev.00) 897349 898688
12 Front Panel sticker, IT ; M-EEG (rev.01) ; S/5 898688
12 Front Panel sticker, JA ; M-EEG (rev.01) ; S/5 8000381
12 Front Panel sticker, NL ; M-EEG (rev.00) 897350 898686
12 Front Panel sticker, NL ; M-EEG (rev.01) ; S/5 898686
12 Front Panel sticker, NO ; M-EEG (rev.00) 897351
12 Front Panel sticker, NO ; M-EEG (rev.01) ; S/5 898692
12 Front Panel sticker, PT ; M-EEG (rev.00) 897352 898689
12 Front Panel sticker, PT ; M-EEG (rev.01) ; S/5 898689
12 Front Panel sticker, SV ; M-EEG (rev.00) 897353
12 Front Panel sticker, SV ; M-EEG (rev.01) ; S/5 898691

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6.1.2 N-EEG rev. 00, 01

Figure 8 Exploded view of headbox

Item Description Order No. Replaced by

1 EEG headbox board, N-EEG 898805
2 Module-headbox cable, N-EEG 895610
3 Headbox input unit 896558
4 AEP-connector, N-EEG 896461 895610
5 EMC cover 898276
6 Membrane keypad 880101
7 Cover 896457
8 Bottom side of N-EEG 896557
9 Cross cyl. head screw M3x6 61515 617210
10 Cross cylinder head screw M3x12 61736
11 Cross cylinder head screw M3x12 zinc-coated 61721
12 Front Panel sticker, DA ; N-EEG (rev.01) ; S/5 898708
12 Front Panel sticker, DE ; N-EEG (rev.01) ; S/5 898699
12 Front Panel sticker, EN ; N-EEG (rev.01) ; S/5 898698

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Item Description Order No. Replaced by

12 Front Panel sticker, ES ; N-EEG (rev.01) ; S/5 898702
12 Front Panel sticker, FI ; N-EEG (rev.01) ; S/5 898705
12 Front Panel sticker, FR ; N-EEG (rev.01) ; S/5 898700
12 Front Panel sticker, IT ; N-EEG (rev.01) ; S/5 898703
12 Front Panel sticker, JA ; N-EEG (rev.01) ; S/5 8000382
12 Front Panel sticker, NL ; N-EEG (rev.01) ; S/5 898701
12 Front Panel sticker, NO ; N-EEG (rev.01) ; S/5 898707
12 Front Panel sticker, PT ; N-EEG (rev.01) ; S/5 898704
12 Front Panel sticker, SV ; N-EEG (rev.01) ; S/5 898706
12 Headbox sticker, DA ; N-EEG (rev.00) 897266
12 Headbox sticker, DE ; N-EEG (rev.00) 897267
12 Headbox sticker, EN ; N-EEG (rev.00) 896512
12 Headbox sticker, ES ; N-EEG (rev.00) 897268
12 Headbox sticker, FI ; N-EEG (rev.00) 897269
12 Headbox sticker, FR ; N-EEG (rev.00) 897270
12 Headbox sticker, IT ; N-EEG (rev.00) 897271
12 Headbox sticker, NL ; N-EEG (rev.00) 897272
12 Headbox sticker, NO ; N-EEG (rev.00) 897273
12 Headbox sticker, PT ; N-EEG (rev.00) 897274
12 Headbox sticker, SV N-EEG (rev.00) 897275
13 Electrode sticker, DA ; N-EEG (rev.01) ; S/5 898207
13 Electrode sticker, DE, EN, FI, ; N-EEG (rev.01) ; S/5 897858
13 Electrode sticker, ES ; N-EEG (rev.01) ; S/5 898203
13 Electrode sticker, FR ; N-EEG (rev.01) ; S/5 898201
13 Electrode sticker, IT ; N-EEG (rev.01) ; S/5 898204
13 Electrode sticker, JA ; N-EEG (rev.01) ; S/5 8000393
13 Electrode sticker, NL ; N-EEG (rev.01) ; S/5 898202
13 Electrode sticker, NO ; N-EEG (rev.01) ; S/5 898208
13 Electrode sticker, PT ; N-EEG (rev.01) ; S/5 898205
13 Electrode sticker, SV ; N-EEG (rev.01) ; S/5 898206

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 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG

7 EARLIER REVISIONS
Revision Manual slot/main manual Note
M-EEG rev. 00 and N-EEG rev. 00 896622-1/896624

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APPENDIX A, Service check form, S/5 M-EEG and N-EEG

APPENDIX A

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This page intentionally left blank.

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SERVICE CHECK FORM

EEG Module, M-EEG and EEG Headbox, N-EEG

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts of
module
3. External parts of 4. Installation
headbox
5. Recognition of module 6. Recognition of headbox

7. Module software M-EEG

N-EEG
8. Communication and 9. Communication and
memories of module memories of headbox
10. Membrane keys

11. Impedances + -
Channel 1 9...11 kΩ
Channel 2 9...11 kΩ
Channel 3 9...11 kΩ
Channel 4 9...11 kΩ
12. Checks with simulator Allowed range
Waveforms 195...205 µVpp
MF 9.5...10.5 Hz
Amp value 68...74 µV
13. FEMG value
FEMG 13...19 µV

A-1(2)
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OK N.A. Fail OK N.A. Fail

14. AEP stimulation

15. AEP response

Channel 1 35...45 µV
Channel 2 35...45 µV
16. Electrical safety check 17. Functioning after
electrical safety check
18. Final cleaning

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 8001011-4
 Datex-Ohmeda Cardiac Output Modules
S/5TM Cardiac Output and SvO2 Module, M-COPSv (Rev. 01)
S/5TM Cardiac Output Module, M-COP (Rev. 03)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8001012-4

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com  Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Cardiac Output Modules, M-COP and M-COPSv
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 2
1.1 General specifications ..............................................................................................................................2
1.2 Typical performance .................................................................................................................................2
1.2.1 C.O. .................................................................................................................................................2
1.2.2 SvO2 ................................................................................................................................................2
1.2.3 InvBP...............................................................................................................................................2
1.3 Technical specifications............................................................................................................................3
2 Functional Description 4
2.1 Measurement principle .............................................................................................................................4
2.1.1 Cardiac output and REF ....................................................................................................................4
2.1.2 SvO2 measurement ..........................................................................................................................5
2.1.3 Invasive blood pressure measurement ..............................................................................................6
2.2 Main components.....................................................................................................................................6
2.2.1 COP board ........................................................................................................................................7
2.2.2 COPSv board..................................................................................................................................10
2.3 Connectors and signals...........................................................................................................................11
2.3.1 Module bus connector ....................................................................................................................11
2.3.2 Front panel connectors ...................................................................................................................12
3 Service Procedures 14
3.1 General service information.....................................................................................................................14
3.2 Service check .........................................................................................................................................15
3.2.1 Recommended tools ......................................................................................................................15
3.3 Disassembly and reassembly..................................................................................................................20
3.4 Adjustments and calibrations..................................................................................................................21
3.4.1 Cardiac output calibration...............................................................................................................21
3.4.2 Invasive pressure calibration...........................................................................................................21
4 Troubleshooting 22
4.1 Troubleshooting charts............................................................................................................................22
4.1.1 Cardiac Output...............................................................................................................................22
4.1.2 SvO2 ..............................................................................................................................................22
4.1.3 InvBP.............................................................................................................................................23
4.2 Troubleshooting flowchart .......................................................................................................................24
5 Service Menu 25
5.1 COP Menu ..............................................................................................................................................26
5.1.1 COP calibration menu.....................................................................................................................28
6 Spare Parts 29
6.1 Spare parts list .......................................................................................................................................29

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6.1.1 Cardiac Output Module, M-COP Rev. 00 – 03..................................................................................29

6.1.2 Cardiac Output and SvO2 Module, M-COPSv Rev. 00 -01 .................................................................31
7 Earlier Revisions 34
APPENDIX A 35
Service check form 1

TABLE OF FIGURES
Figure 1 Cardiac Output Module, M-COP, and Cardiac Output and SvO2 Module, M-COPSv .................................. 1
Figure 2 Cardiac output measurement curve....................................................................................................... 5
Figure 3 Front panels of Cardiac Output Modules, M-COP and M-COPSv.............................................................. 6
Figure 4 COPSv board block diagram, on COP board the SvO2 section is excluded................................................ 8
Figure 5 Pressure transducer principle of operation............................................................................................. 8
Figure 6 Serial communication and opto isolation............................................................................................... 9
Figure 7 Cardiac Output Module troubleshooting flowchart................................................................................24
Figure 8 Single width module box, Cardiac Output Module, M-COP....................................................................29
Figure 8 Cardiac Output Module, M-COP ..........................................................................................................30
Figure 9 Single width module box, Cardiac Output and SvO2 Module, M-COPSv .................................................31
Figure 10 Cardiac Output and SvO2 Module, M-COPSv....................................................................................32

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 Cardiac Output Modules, M-COP and M-COPSv

INTRODUCTION
This section provides information for the maintenance and service of Cardiac Output Modules,
M-COP and M-COPSv. Cardiac Output Modules, M-COP and M-COPSv are single width plug-in
modules designed for use with the S/5 monitors. Later in this manual modules may be refered to
without the S/5 system nomenclature for simplicity.
Please also refer to the Technical Reference Manual of the S/5 monitor for information related to
the system e.g. related documentation, conventions used, symbols on equipment, safety
precautions, system description, system installation, interfacing, functional check and planned
maintenance.

Both modules M-COP and M-COPSv provide

• Cardiac output (C.O.)
• Right ventricular ejection fraction (REF)
• Invasive blood pressure (InvBP) measurement
Additionally, the COPSv module provides venous oxygen saturation (SvO2) measurement.
NOTE: Do not use identical modules in the same monitor simultaneously. These modules are
considered as identical and would cause communication errors if used in the same system.

Figure 1 Cardiac Output Module, M-COP, and Cardiac Output and SvO2 Module, M-COPSv

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1 SPECIFICATIONS

1.1 General specifications

Module size (W × D × H) 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.35 kg / 0.8 lbs

Power consumption, M-COP Approximately 3.5 W

Power consumption, M-COPSv Approximately 5 W

1.2 Typical performance

1.2.1 C.O.
Measurement range 0.1...20 l/min
Display resolution 0.01 l/min
Repeatability ±2 % or ±0.02 l/min whichever is greater
(measured from electrically generated flow curves)
Max. change in blood temp 2.99 °C
Injectate temp range (with Edward Lifesciences Corp. compatible probes)
0...25.5 °C ±0.3 °C
25.5...27.0 °C ±0.5 °C
Blood temp range (with Edward Lifesciences Corp. compatible catheters)
17.5...30.9 °C ±0.5°C
31.0...43.0 °C ±0.3°C
Protection against electric shock type CF defibrillation proof
REF
Repeatability ±2 %
(Measuring range 10-60 %)

1.2.2 SvO2
Accuracy ±2 %
(Measuring range 30-95 %)
Equal to standard deviation when using in-vivo calibration.

1.2.3 InvBP
Measurement range -40...+320 mmHg
Zero adjustment range ±150 mmHg
Calibration range ±20 %

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 Cardiac Output Modules, M-COP and M-COPSv

Scales Upper limit is adjustable between 10 and 300

mmHg in steps of 10. Lower limit is 10 % of selected
upper limit below zero.
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40...+320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30...+300 mmHg
PULSE RATE
Measurement range 30...250 bpm
Resolution 1 bpm
Accuracy ±5 % or ±5 bpm whichever is greater
Respiration artifact rejection

1.3 Technical specifications

The digital display is averaged over 5 seconds and updated at 5 second intervals.
Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and input sensitivity 5 µV/V/mmHg
Input voltage 5VDC
max current 20 mA
Nonlinearity <1 %, 0 to 200 mmHg
<2 %, -40 to 0 and 200 to 320 mmHg
Filter 0...22 Hz (-3 dB),
adjustable upper limit 4...22 Hz
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time < 15 sec
Protection against electric shock type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified accuracy, depending
on the transducer/probe used. Please check the transducer/probe specification.

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 Cardiac output and REF

Cardiac output measurement is done using the principle of thermodilution. During measurement
the catheter lies in the heart, with an injection port in the right atrium (RA) and a thermistor, which
is to monitor blood temperature, in the pulmonary artery (PA). A small, known amount of thermal
indicator is injected into the RA and is mixed with the blood on its way to the PA. The catheter
thermistor measures the decrease in blood temperature as the blood flows past the thermistor in
the PA.
The information is stored in the module and the cardiac output is calculated from the area beneath
the time-temperature Cardiac Output Measurement Curve, as shown in figure 2.
The area under the time-temperature curve is inversely proportional to the flow rate which
corresponds to cardiac output.
The cardiac output is calculated from the equation:
C.O.= (1.08 CT 60 Vi(TB-Ti))/(TBdt + C)
where:
C.O. = cardiac output in liters/minute
1.08 = factor comparing the density and specific heat of 5% dextrose solution in water to
those of blood.
CT = correction factor for the injectate temperature rise as it passes through the
catheter and its dead space
60 = seconds/minute
Vi = injectate volume in liters
TB = baseline blood temperature (°C)
Ti = injectate temperature
TBdt = area under time-temperature curve between time o and x, where x is the
time when the curve has dropped to 30% of its peak value.
C= area beneath time-temperature curve between x and the end of the
curve.

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Temperature change in blood [%

-T
area A

100% start of meas.

80% end of meas.

area C
30%

0%

t
m.s. 80% 30%
Time

Figure 2 Cardiac output measurement curve

A = area derived by integration of the time-temperature curve

C = area beneath the time-temperature curve between t30% and end of the curve. Computation
based on an exponential fit to the curve between t80% of the peak and t30%.
REF (right ventricular ejection fraction) measurement is a part of the time-temperature
(thermodilution) cardiac output measurement. Ejection fraction is determined using an exponential
technique by synchronizing sensed R-waves with points of temperature changes on the time-
temperature curve. Once ejection fraction, cardiac output, and heart rate are known, right
ventricular volumes may be calculated. The measurement requires a Baxter-Edwards fast response
thermistor catheter and an ECG module to synchronize R-wave detection to the time-temperature
curves.

2.1.2 SvO2 measurement

The COPSv module measures SvO2 when coupled with a Baxter-Edwards OM-2E optical module
and a Swan-Ganz oximetry catheter. To measure SvO2, the system utilizes a spectrophotometric
technique involving the use of light emitting diodes (LEDs) that produce red (660 nm) and infrared
(810 nm) light. The light is transmitted to the blood through a single plastic optical fiber in the
oximetry catheter and reflected back through a separate optical fiber to a photodetector in the
optical module. The light is electrically transmitted to the COPSv module and analyzed to
determine SvO2.
The oximetry portion of the system measures SvO2 in the pulmonary artery by detecting color
changes in the red blood cells. When pulses of red and infrared light are transmitted through the
oximetry catheter, the light is reflected from the red blood cells and transmitted back through the
catheter to the optical module. The amount of light reflected at each wavelength depends primarily
on the color of the blood and the number of red blood cells. Since the number of red blood cells in
the blood affects the amount of reflected light, the differences are compensated for when the
patient’s total hemoglobin value is entered. The optical module stores and transfers SvO2
calibration data. SvO2 values can be affected by the presence of methemeglobin or
carboxyhemoglobin which imitate the absorption characteristics of HbO2. Large concentrations of
methemoglobin or carboxyhemoglobin could then cause a falsely elevated SvO2. In cases where
dysfunctional hemoglobins are suspected, SvO2 should be interpreted with caution.

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2.1.3 Invasive blood pressure measurement

To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The pressure transducer is
placed at the same level with the heart, and electrically zeroed.
The pressure transducer is a piezo-resistive device that converts the pressure signal to a voltage.
The monitor interprets the voltage signal so that blood pressure data and blood pressure
waveforms can be displayed.

2.2 Main components

The Cardiac Output Module, M-COP consist of a COP circuit board and two input boards - a CO
input board and a P input board, attached to the front panel.
The Cardiac Output and SvO2 Module, M-COPSv, consist of a COPSv circuit board and three input
boards - a CO input board, a SvO2 input board and a P input board, attached to the front panel.
The front panels are shown in figure 3.

M-COP M-COPSv
1 2

P4 P4

3
SvO2

4 6

C.O. C.O.

Figure 3 Front panels of Cardiac Output Modules, M-COP and M-COPSv

(1) Key for pressure zeroing (Zero P4)

(2) Key for cardiac output measurement (Start C.O.)
(3) Connector for invasive blood pressure measurement
(4) Connector for C.O. self test
(5) Connector for C.O. measurement
(6) Connector for SvO2 measurement

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2.2.1 COP board

The COP board consists of the following functional sections.
• Processor
• Cardiac output measurement
• Cardiac output self test
• Invasive blood pressure measurement
• Serial communication
• Isolation
• Power supply

Processor section
The microprocessor uses the Intel 80C196KC-16 CPU which includes three A/D converters and a
UART. The microprocessor uses external memories, an 8-bit data bus, a 16 MHz oscillator, and a
watchdog timer. The three A/D-converters within the CPU convert the analog input signals to
digital. The internal UART communicates and transfers data between the module and the CPU
board in the monitor.

Cardiac output measurement section

The catheter and the probe contain an NTC resistor that reacts to temperature change.

The temperature dependent voltage across the NTC resistor is amplified and an offset value is
added to it. The resultant signal is then regulated into a ±5 V range by voltage slicing and sent to an
A/D converter.

Because the temperature measurements are calibrated digitally and non-linearity of

catheter/probe is compensated for by software, ambient temperature change after calibration is
the only factor that may influence the measurement.

Cardiac output self test

The Cardiac Output Module, M-COP contains a C.O. Self Test connector.

When the cable is connected to the C.O. Self Test connector, the microprocessor starts the test
program automatically. First, the microprocessor measures 30 °C, then it activates test circuits
and measures 37 °C and 41 °C.

If the values are not correct ‘Cable fault’ is displayed and there is a fault is either in the module or in
the catheter connecting cable.

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Module Module Power for

Power for
data reset communication
module
RS485
RS485
DRIVER POWER
DRIVER
FOR POWER NON-
FOR
MODULE RESET ISOLATION
DATA
RESET SECTION

OPTO ISOLATION
ISOLATION PATIENT ISOLATION TRANS-
FORMER
Reset MICROPROCESSOR
RAM internal 256
NON- POWER
external 16K
VOLATILE Module bus data EPROM 48K ISOLATION
MEMORY RS COMMUNICATION SECTION

Serial device
communication AD-
CONVERTER
8 chn
12 bit

SvO2 AD C.O. C.O. Press AD

OM-2 control control AD

SvO2 C.O. P4 INV FRONT

PRESSURE
MEASURING MEASURING PANEL
MEASURING
UNIT UNIT UNIT KEYS

To optical module

Figure 4 COPSv board block diagram, on COP board the SvO2 section is excluded

Invasive blood pressure measurement section

Pressure
Vin transducer
Instrumentation
amplifier

Vout Input
Filter G
pressure_meas_principle.vsd

to A D converter

Figure 5 Pressure transducer principle of operation

An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From
the bridge circuit output a differential voltage, which depends on blood pressure and input supply
voltage, is calculated using the following formula:

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Uout = Uin x Pressure x 5 V, where Uin = 5 V Þ Uout = 25 V x Pressure [mmHg]

Pressure amplification is performed by the instrumentation amplifier. The gain of the amplifier is
set so that the level of the signal transferred to the A/D converter stays within the measurement
range even when there are circumstantial offsets or offsets caused by the pressure transducer. The
input filter before the amplifier attenuates high frequency disturbances.
A FET switch cuts the measurement current and detects the existence of the pressure transducer.
The existence of the pressure transducer is also checked digitally by a jumper next to the
connector.

Serial communication
Serial communication between the Cardiac Output Module and the Central Unit Frame is via an
RS485 type bus. The communication bus drivers are powered from the Module Bus. The module
isolation section is powered (+5 V) from the isolated power supply.
The communication drivers are controlled by a Reset signal such that when the Reset is active the
drivers do not transfer data.
In addition to the RS485 reset there is a logic power-up reset, which holds for approximately 500
ms regardless of the state of the RS485 reset. A time constant determines the power-up reset time.
The power-up reset also prevents the module from sending data to the Module Bus. The data
transmission rate is 500 kbps.
5 kv

Receive data Data

to module prosessor

Send data RS485

Receive data driver NData

to central unit
(module bus)
Send data
Opto isolation Send/receive
Send/receive
Reset Reset in
Reset RS485 serial_comm_opto_isol.vsd
driver NReset in
isolation
Patient

Figure 6 Serial communication and opto isolation

Isolation section
There are two opto isolators, one for data and one for the reset signal. Signals are processed on
logical high-low levels even though the output of the opto isolators in the isolation section are
analog signals.
The reset line is an open collector type, with a pull-up resistor so that the microprocessor is able to
use its internal watchdog function.

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Power supply section

The module isolated power supply is developed from the +15 Vdirty (non isolated) supply from the
Central Unit power supply.
The isolated power supply is a switched-mode circuit, where an FET switch is controlled by an
oscillator using a bipolar timer. The frequency of the oscillator is approximately 30 kHz, with a
pulse ratio of 50%; switching of the FET is slow to suppress spurious interference. A special
isolation pulse transformer is used in the circuit. The transformer secondary circuit uses normal
linear regulators except for +5 V which uses a low drop type linear regulator.

2.2.2 COPSv board

The COPSv board consists of the same functional sections as the COP board, except for the cardiac
output self test section. Additionally, the COPSv board consists of the SvO2 measurement section.

SvO2 measurement section

The SvO2 algorithm is a part of the COPSv module software. The algorithm consists of five different
parts; initialization, calibrations, signal processing and SvO2 calculation, automatic gain control,
and signal quality analysis.
Initialization
When the optical module is connected to the COPSv module, a number of start-up procedures are
performed prior to normal operation. These procedures include transfer of calibration factors from
the optical module to the COPSv module and initialization of LED currents.
Calibration
The system is calibrated according to either in-vitro or in-vivo calibration. In-vitro calibration is
performed before the oximetry catheter is removed from the package with the catheter tip still
inside the calibration cup. The resulting calibration factor is calculated on the basis of the
measured ratio of red and infrared signals and the ideal ratio for the calibration cup. In-vivo
calibration is performed when the catheter is inserted into the patient’s pulmonary artery. The
resulting calibration factor is based on the measured ratio of red and infrared signal and the Hgb
and SvO2 values measured in a laboratory. If the calibration is skipped, the result of an old
calibration is used instead and the “Not calibrated” message is displayed in the SvO2 number field.
Signal processing and SvO2 calculation
The reflected red and infrared signals transferred from the optical module to the COPSv module are
filtered, and SvO2 is calculated on the basis of the ratio of the two signals.
Automatic gain control
The intensity of the red and infrared signals can be amplified by four different gains. The gain is
selected automatically to achieve optimal signal levels.
Signal quality
The reflected red and infrared signals are checked for wall contact artifacts, pulsatility and intensity
shifts. An index is calculated to indicate the signal quality. 0 indicates a normal signal, 1 indicates
an intermediate signal, 2 indicates a poor signal, and 3 indicates an unacceptable signal. Please
refer to the service menu section for more information.

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2.3 Connectors and signals

2.3.1 Module bus connector

Pin I/O Signal
13 1
1 I RESET_RS485*
25 14 2 I -15 VDC*
3 I +15 VDIRTY*
4 I +15 VDC*
5 I/O -DATA_RS485*
6 I/O DATA_RS485*
7 - Ground & Shield*
8 I -RESET_RS485*
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 - Ground & Shield*
14 I +32 VDIRTY
15 I GroundDIRTY*
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 - ON/STANDBY
21 - BIT0IN
22 - RXDD_RS232
23 - TXDD_RS232
24 I +5 VDC*
25 I +5 VDC*
*Used in the M-COP module

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2.3.2 Front panel connectors

Invasive blood pressure connector (P4)

Pin Signal
1 Pressure 4 +
3 6 2 Pressure 4 -
1 9 3 Polarization - (ground)
4 7
2 0
4 Polarization +
5 8 5 Not connected
6 Not connected
7 Not connected
8 Not connected
9 Ground
0 Cable detection

Cardiac output connector (C.O.)

Pin Signal
1 BAB
14 13
12
2 THB
1 15 11 10
2 16 9
3 BAC
3 4 17 8 4 Not connected
5
6
7 5 Shield
6 Not connected
7 THD
8 THA
9 THC
10 BAA
11 Not connected
12 Not connected
13 Not connected
14 FL
15 Not connected
16 Not connected
17 Not connected

C.O. Self Test connector (C.O. Test)

Pin Signal
1 CTC
4 2 2 CTA
3 1 3 CTB
4 CTD

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SvO2 connector (SvO2)

Pin Signal
1 IR_CATHODE
14 1
2 CE
13 15 2
12 11 16 3 3 SK
10
4
5
4 DATA_OUT
9
17 6
5 CHASSIS_GND
8 7
6 SVO2_GND
7 HEATER_RTN
8 REMOTE_OUT
9 +V_OPT
10 TEMP_SENSOR
11 HEATER_HI
12 LOCAL_OUT
13 REF_RTN
14 LED_ANODE
15 RED_CATHODE
16 DATA_IN
17 -V_OPT

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-COP and M-COPSv modules is limited to replacing faulty mechanical parts.
The COP board and the COPSv board cannot be replaced, and all calibrations can only be done at
the factory.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with the appropriate tools and equipment should perform
the tests and repairs outlined in this section. Unauthorized service may void
warranty of the unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Patient simulator
SvO2 simulator 890121
Pressure manometer
InvBP transducer
Catheter connecting cable
Screwdriver

All modules
• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.

1. Check internal parts:

• screws are tightened properly
• cables are connected properly
• all socket mounted IC’s are inserted properly
• EMC covers are attached properly
• there are no loose objects inside the module

?
2. Check external parts:
• the front cover and the front panel sticker are intact
• all connectors are intact and are attached properly
• the module box, latch and spring locking pin are intact

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?
• Reattach the module box and check that the latch moves properly.
• Turn the monitor on and wait until the monitoring screen appears.
• Configure the monitor screen so that all the required parameters are shown, for example :
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 4 - P4
Digit Fields - Field 4 - SvO2
• Preset the C.O., SvO2 and InvBP measurement settings:
Others - C.O. View - C.O. Setup - Scale - 1.0 °C
Injectate Volume - 10 ml
Measurement Mode - SET
SvO2 - Update Hgb - 115 g/l

Invasive Pressures - P4 Setup - Label - PA

3. Plug in the module. Check that it goes in smoothly and locks up properly.

?
4. Check that the module is recognized by entering the C.O. View menu:

Others - C.O. View

Check that the message “No Catheter” is shown in the middle of the menu and the message
“No cable” in the digit field for SvO2, if it is an M-COPSv module.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding COP software by selecting SCROLL VERS and turning
the ComWheel.

?
6. Enter the COP module service menu:

Parameters - COP

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not
increasing faster than by 5 per second. Check that the module memories have passed the
internal memory test, i.e. “RAM”, “ROM” and “EEPROM” all show OK.

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Invasive blood pressure measurement

7. Check the front panel membrane key ZERO P4.
Press the key for at least one second. Check that the key being pressed is identified, i.e. the
information on the service menu under “Button” - “P4” changes from OFF to ON.

?
8. Check that “Cable” and “Probe” for P4 show OFF. Plug a cable with an invasive blood
pressure transducer into the front panel connector P4 and check that “Cable” and “Probe”
show ON and the corresponding pressure waveform appears on the screen.

?
9. Calibrate InvBP channel P4 according to the instructions in the Technical Reference Manual.

?
10. Return to the normal monitoring screen by pressing the “Normal Screen” key on the
Command Board. Check the InvBP channel with a patient simulator.
The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

SENSITIVITY -switch; 5 µV/V/mmHg

ECG - BASE - BPM - 60

BP - 3 - WAVE - ATM

Connect the cable from channel BP3 to module connector P4. Zero the InvBP channel P4 by
pressing the ZERO P4 key on the module front panel.

BP - 3 - WAVE - PA

Check that appropriate InvBP waveforms are shown and the InvBP value is approximately
25/10 (±2 mmHg) for channel P4 (PA).

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SvO2 measurement
11. Enter the COP module service menu. Check that the SvO2 values “Meas. state”, “OM fail” and
“OM temp.” all show NO OM.

Turn the SvO2 simulator’s pulsation switch to “Medium” and the range switch to “Normal
pulse”. Connect the simulator to the module and check that the messages “Initializing,
please wait”, “Warming up” and “Not calibrated” appear in the digit field for SvO2.

Initializing, please wait --> Warming up --> Not calibrated

Check that “Meas. state” has changed to NORMAL and “OM fail” and “OM temp.” show OK.

NOTE: “OM temp.” may show UNSTABLE at first, but the message should change to OK within
a half a minute.

?
12. Perform an In-Vitro -calibration. Keep the SvO2 simulator connected to the module and turn
the pulsation switch to “No pulse”.

Enter the SvO2 -menu:

Others - SvO2

Highlight the CALIBRATE IN VITRO text and press the ComWheel to start the calibration. Wait
until the text “Start SvO2” appears in the menu.

Turn the SvO2 simulator pulsation switch to “Normal Pulse” and complete the calibration by
pressing the ComWheel again. Wait until the text “Calibrating” disappears from the digit field
for SvO2.

Check that the calibration date for In-Vitro calibration was updated correctly and the SvO2
reading on the screen is 81 % (±2).

?
13. Turn the SvO2 simulator pulsation switch to “No pulse” and check that the message “Check
cath. position” appears in the digit field for SvO2 and the message “SvO2 poor signal”
appears in the message field within one minute.

Turn the pulsation switch to “High pulse” and check that the two messages remain on the
screen.

Turn the pulsation switch back to “Normal pulse” and check that the messages disappear
within one minute.

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Cardiac Output measurement

14. Check the front panel START C.O membrane key.
Enter the COP module service menu. Press the key for at least one second and check that it is
identified, i.e. the information on the service menu under “Button” - “C.O.” changes from OFF
to ON.

?
• Enter the “C.O. View” menu:
Others - C.O. View
Connect a catheter connecting cable to module connector C.O.

15. If the module contains the C.O. Test connector (M-COP), attach the catheter connector of the
connecting cable to the C.O. Test connector. Check that the message “Cable OK” appears on
the menu after the self-test.

No Catheter --> Self Test in Progress --> Cable OK

If the message “Cable fault” appears, exchange the cable and perform the same again.

?
16. Check the C.O. measurement with a patient simulator.

The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

C.O. - BASE - 37 °
WAVE

Leave the WAVE menu open on the simulator. Connect the catheter connecting cable (both
connectors) to the simulator’s C.O. box. Highlight the text START C.O. SET on the C.O. View
menu.
Press the ComWheel to start the measurement. When the text “Inject now!” appears on the
menu, select the setting 5 l/min (F3) from the medSim 300 simulator. Check that the
thermodilution curve displayed returns to the base level on the screen. Complete all 6
measurements .

NOTE: The medSim 300 simulator may give an inaccurate C.O. signal immediately after it has
been turned on and after each new simulator setting. This property of the simulator must be
taken into account when interpreting the C.O. results.

17. When the set is complete, exclude the first measurement from the average using the C.O.
View menu functions:
Edit Average - Exclude Curves - 1
Press the ComWheel to exclude the first curve. Check that each of the remaining results is
within ±2 % of the new average.

?
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All modules
17. Perform an electrical safety check and a leakage current test.

?
18. Check that the module functions normally after performing the electrical safety check.

?
19. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the Cardiac Output Modules ,M-COP and M-COPSv, in the following way. (see the
exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearwards and remove it from main body. Be careful with the
loose latch and spring locking pin.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected
properly.

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3.4 Adjustments and calibrations

3.4.1 Cardiac output calibration

The cardiac output calibration can be performed only at the factory.

3.4.2 Invasive pressure calibration

Calibrate invasive pressure when the pressure transducer (probe) is replaced with a different type
of transducer.
1. Enter the COP service menu (Monitor Setup - Install/Service - Service - Parameters)
2. Enter the Calibrations menu.

3. Connect a pressure transducer with a pressure manometer to the P4 connector. Select

‘Calibrate P4’ from the menu. Leave the transducer at room air pressure.
4. Press the ComWheel to start zeroing.
5. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
6. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel.
A tolerance of ±1 mmHg is allowed.
7. The text ‘calibrated’ will appear on the display.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

4.1.1 Cardiac Output

Trouble Cause Treatment
NO CATHETER-message Catheter or cable not connected. Connect catheter (cable).
Catheter or cable faulty. Check by self-test. Change catheter or cable.
Blood temp out of range. Check blood temp is within range.
Tinj OFF-message No injectate temp probe. Connect probe.
Probe faulty. Change probe.
Wrong type of probe. Use Baxter compatible inj. temp probe.
Temp out of range. Check blood temp is within range.

4.1.2 SvO2
Trouble Cause Treatment
Faulty cable Factory calibration of the optical Replace optical module.
module corrupted.
Red or infrared transmit error, currents
cannot be adjusted to factory
defaults.
No cable No optical module connected. Connect optical module.
Insufficient signal Loose catheter connection. Check connection.
Optical module failure. Replace optical module.
Catheter kinked or damaged. Calibrate In vivo or replace catheter if necessary.
Warming up Temperature of the optical module Please wait. If it takes longer than 20 minutes
has not yet reached the optimum replace optical module or COPSv module.
value or optical module failure or
COPSv module failure.
Poor SvO2 signal Signal pulsatility, wall contact or Check number field message for problem “Check
intensity shift signal quality level at 3. catheter position” or “Intensity shift”.

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4.1.3 InvBP
Trouble Cause Treatment
Abnormally low pressure Transducer wrongly positioned. Check mid-heart level and reposition
transducer.
No pressure Defective transducer. Check transducer.
No pressure module plugged in. Check the module.
No waveform selected on screen. To select the desired pressure waveforms
press Monitor Setup key and select modify
waveforms.
Check that the pressure transducer is
open to the patient.
Not zeroed-message Measurement on, channel not zeroed. Zero the channel.
Zeroing failed-message Unsuccessful zeroing of P4 (number Possibly due to pulsating pressure
field). waveform. Open the transducer to room air
and zero the channel.
Offset is > 150 mmHg. Open the
transducer to room air and zero the
channel.
Defective transducer. Replace and zero
the channel.
Calibration failed-message Unsuccessful calibrating of P4 Pulsating waveform. Turn the transducer to
(number field). sphygmomanometer and try again (zeroing
takes place first).
Gain is beyond the limits (±20 % of the
default gain) of the module. Replace the
transducer.
Out of range ≤ 40 mmHg Measurement pressure is beyond Check transducer level. Zero the channel.
measurement range.
Out of range > 320 mmHg Measurement pressure is beyond Check transducer level. Zero the channel.
measurement range. The patient may also have high blood
pressure.
Zero adj. > 100 mmHg Offset when zeroing is > 100 mmHg Check transducer. The waveform may hit
(but < 150 mmHg) from the absolute the top and the numeric display not
zero of the module (with default gain). shown.
Out of range Measured pressure is beyond the The waveform hits the top and the numeric
internal measurement range of the display not shown. Check transducer and
module. its level. Zero the channel.

See also the troubleshooting flowchart on the next page.

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4.2 Troubleshooting flowchart

Possibly faulty
COP module

Take all modules out

of the Frame

Insert M-COP
and turn
power on

No
Does fault Fault not in COP
still appear? module

Yes No

Enter the Service

menu

Does another
Module-ID No
module work
on screen? in the same
slot?
Yes
Yes

Check front panel key Return module to

functions in Service factory for repair
menu

Yes
Do they
work?
COP_troublsh_flowchrt.vsd

No

Check front panel unit

and COP board to
find culprit.
Replace if necessary.

Figure 7 Cardiac Output Module troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters.
5. Select COP.

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5.1 COP Menu

COP
Record Data Record Data prints out the service data and module information (id. serial number and software
id.) on the Recorder Module, M-REC.
Service Data
P4
Gain is a coefficient to compensate for gain error. Typically the value is between 17000 and
25000. Calibrate if the zero and/or gain value is outside the ranges.
Zero indicates the offset compensation value of each parameter in the A/D converter. Usually the
value is within ±1000.
Cable shows ON when the corresponding cable is connected to the front panel and Probe shows
ON when the corresponding probe is connected to the cable.
Value shows the measured numeric values simultaneously. Pressure value is a real time value and
shown in mmHg.
Probe items Catheter (ON/OFF) and Inj. (FT, BATH, or OFF) indicate connections and Value
indicates the measured temperatures in 0.01 °C increments.
SvO2
Meas. state: Measurement status shows: No optical module (No OM) connected, initializing the
optical module (Init OM), normal measurement state (Normal) and failed module (OM fail).
Value is a measured SvO2 value.
Gain is the gain of the remote red and infrared signals (0, 1, 2 or 3)
Red int: Reflected red intensity
Ired int: Reflected infrared intensity
Loc red: Local red intensity

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Loc ired: Local infrared intensity

OM fail: Reason why initialization OK (OK), can’t read EEPROM of the optical module correctly
(EEPROM), can’t adjust LED current to get required local signal (Transmit).
OM temp: Temperature of the optical module OK (OK), temp under 43 °C (Under), temp over 47 °C
(Over).
Pulse SQI: Signal quality index for pulsing (low pulse/high pulse). 0 indicates a normal signal, 1
indicates an intermediate signal, 2 indicates a poor signal, and 3 indicates an unacceptable
signal.
Clipp. SQI: Signal quality index for wall artifact. 0 indicates a normal signal, 1 indicates an
intermediate signal, 2 indicates a poor signal, and 3 indicates an unacceptable signal.
Int. SQI: Signal quality index for intensity shift from previous calibration or Hgb update (intensity
decreased/increased) 0 indicates a normal signal, 1 indicates an intermediate signal, 2 indicates
a poor signal, and 3 indicates an unacceptable signal.
Button: The front panel Zero P4 and Start C.O. key functions can be confirmed by pressing the key
and checking that the relevant OFF message turns to ON.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to the monitor has failed.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) during
normal operation indicates either serial communication failure or the module is not in place.
RAM indicates the state of the external RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the software calculated
value.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.1.1 COP calibration menu

Calibrate P4
This function is for calibrating the invasive blood pressure channel P4.
The calibration requires a pressure transducer (with an appropriate cable) and a pressure
manometer.
Calibration:
1. Connect the pressure transducer with the pressure manometer to the P4 connector. Select
Calibrate P4. Leave the transducer at room air pressure.
2. Press the ComWheel to start zeroing.
3. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
4. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel.

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6 SPARE PARTS

6.1 Spare parts list

NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1.1 Cardiac Output Module, M-COP Rev. 00 – 03

Figure 8 Single width module box, Cardiac Output Module, M-COP

Item Description Order No. Replaced by

11 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel unit, M-COP 881191
Front panel cover for M-COP (w/o connectors) 880895

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Figure 9 Cardiac Output Module, M-COP

Item Description Order No. Replaced by

6 Cross cylinder-head screw M3x6 61721
7 Metal frame 879184
8 EMC cover 884099
9 C.O. Test connector, M-COP 546215
10 Cross cylinder-head scerw M3x12 628700
11 Membrane keypad 880101
12 Front Panel sticker, DA ; M-COP (rev.02) 892213 898732
12 Front Panel sticker, DA ; M-COP (rev.03); S/5 898732
12 Front Panel sticker, DE ; M-COP (rev.02) 880978 898723
12 Front Panel sticker, DE ; M-COP (rev.03); S/5 898723
12 Front Panel sticker, EN ; M-COP (rev.02) 880770 898722
12 Front Panel sticker, EN ; M-COP (rev.03); S/5 898722
12 Front Panel sticker, ES ; M-COP (rev.02) 884387 898726
12 Front Panel sticker, ES ; M-COP (rev.03); S/5 898726
12 Front Panel sticker, FI ; M-COP (rev.02) 888871 898729
12 Front Panel sticker, FI ; M-COP (rev.03); S/5 898729
12 Front Panel sticker, FR ; M-COP (rev.02) 881271 898724
12 Front Panel sticker, FR ; M-COP (rev.03); S/5 898724
12 Front Panel sticker, IT ; M-COP (rev.02) 886757 898727
12 Front Panel sticker, IT ; M-COP (rev.03); S/5 898727
12 Front Panel sticker, JA ; M-COP (rev.02) 888309 898733
12 Front Panel sticker, JA ; M-COP (rev.03); S/5 898733
12 Front Panel sticker, NL ; M-COP (rev.02) 886064 898725
12 Front Panel sticker, NL ; M-COP (rev.03); S/5 898725

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Item Description Order No. Replaced by

12 Front Panel sticker, NO ; M-COP (rev.02) 893557 898731
12 Front Panel sticker, NO ; M-COP (rev.03); S/5 898731
12 Front Panel sticker, PT ; M-COP (rev.02) 895253 898728
12 Front Panel sticker, PT ; M-COP (rev.03); S/5 898728
12 Front Panel sticker, SV ; M-COP (rev.02) 885871 898730
12 Front Panel sticker, SV ; M-COP (rev.03); S/5 898730
13 Cross cylinder-head screw M3x16 628710
14 Star washer 63611
15 Protection plate 883946
16 Insulation plate for 883946 884121

6.1.2 Cardiac Output and SvO2 Module, M-COPSv Rev. 00 -01

Figure 10 Single width module box, Cardiac Output and SvO2 Module, M-COPSv

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5

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Figure 11 Cardiac Output and SvO2 Module, M-COPSv

Item Description Order No. Replaced by

6 Cross cylinder-head screw M3x6 61721
7 Metal frame 879184
8 EMC cover 884099
9 SVO2 cable 888546
10 Cross cylinder-head scerw M3x12 628700
11 Membrane keypad 880101
12 Front Panel sticker, DA ; M-COPSv (rev.00) 892214 898787
12 Front Panel sticker, DA ; M-COPSv (rev.01) ; S/5 898787
12 Front Panel sticker, DE ; M-COPSv (rev.00) 889550 898778
12 Front Panel sticker, DE ; M-COPSv (rev.01) ; S/5 898778
12 Front Panel sticker, EN ; M-COPSv (rev.00) 887376 898777
12 Front Panel sticker, EN ; M-COPSv (rev.01) ; S/5 898777
12 Front Panel sticker, ES ; M-COPSv (rev.00) 889555 898781
12 Front Panel sticker, ES ; M-COPSv (rev.01) ; S/5 898781
12 Front Panel sticker, FI ; M-COPSv (rev.00) 889554 898784
12 Front Panel sticker, FI ; M-COPSv (rev.01) ; S/5 898784
12 Front Panel sticker, FR ; M-COPSv (rev.00) 889551 898779
12 Front Panel sticker, FR ; M-COPSv (rev.01) ; S/5 898779
12 Front Panel sticker, IT ; M-COPSv (rev.00) 889556 898782
12 Front Panel sticker, IT ; M-COPSv (rev.01) ; S/5 898782
12 Front Panel sticker, JA ; M-COPSv (rev.00) 890212 898788
12 Front Panel sticker, JA ; M-COPSv (rev.01) ; S/5 898788
12 Front Panel sticker, NL ; M-COPSv (rev.00) 889552 898780
12 Front Panel sticker, NL ; M-COPSv (rev.01) ; S/5 898780
12 Front Panel sticker, NO ; M-COPSv (rev.00) 893558 898786
12 Front Panel sticker, NO ; M-COPSv (rev.01) ; S/5 898786
12 Front Panel sticker, PT ; M-COPSv (rev.00) 895239 898783
12 Front Panel sticker, PT ; M-COPSv (rev.01) ; S/5 898783

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Item Description Order No. Replaced by

12 Front Panel sticker, SV ; M-COPSv (rev.00) 889553 898785
12 Front Panel sticker, SV ; M-COPSv (rev.01) ; S/5 898785

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7 EARLIER REVISIONS
This manual supports all earlier Cardiac Output Module revisions.

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APPENDIX A, Service Check Form, M-COP/M-COPSv

APPENDIX A

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 APPENDIX A, Service Check Form, M-COP/M-COPSv

SERVICE CHECK FORM

Cardiac Output Modules, M-COP and M-COPSv

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules
OK N.A. Fail OK N.A. Fail
1. Internal parts 2. External parts

3. Installation 4. Recognition

5. Module software COP

6. Communication and
memories
Notes

InvBP measurement
7. Membrane keys 8. External parts

9. Calibration 10. Test with patient simulator

Notes

SvO2 measurement
11. Membrane keys 12. Calibration

13. SvO2 messages

Notes

A-1(2)
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Datex-Ohmeda S/5 monitors

C.O. measurement
14. Membrane keys 15. Self test

16. Test with patient

simulator
Notes

17. Electrical safety check 18. Functioning after

electrical safety
check
19. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 8001012-4
 Datex-Ohmeda Pressure Modules
S/5TM Pressure Temp Module, M-PT (Rev. 02)
S/5TM Pressure Module, M-P (Rev. 04)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1013-4

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Pressure Module, M-P, Pressure Temp Module, M-PT
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 3
1 Specifications 4
1.1 General specifications ..........................................................................................................................4
1.2 Typical performance .............................................................................................................................4
1.2.1 InvBP...........................................................................................................................................4
1.2.2 Temperature ................................................................................................................................4
1.2.3 Signal output ...............................................................................................................................4
1.3 Technical specifications........................................................................................................................5
1.3.1 InvBP...........................................................................................................................................5
1.3.2 Temperature ................................................................................................................................5
1.3.3 Signal output ...............................................................................................................................5
2 Functional Description 6
2.1 Measurement principle .........................................................................................................................6
2.1.1 Invasive blood pressure ................................................................................................................6
2.1.2 Temperature ................................................................................................................................6
2.2 Main components.................................................................................................................................6
2.2.1 PT board ......................................................................................................................................8
2.3 Connectors and signals.......................................................................................................................12
2.3.1 Module bus connector................................................................................................................12
2.3.2 Front panel connectors...............................................................................................................13
2.3.3 Other connectors........................................................................................................................13
3 Service Procedures 15
3.1 General service information ................................................................................................................15
3.2 Service check.....................................................................................................................................15
3.2.1 Recommended tools ..................................................................................................................15
3.3 Disassembly and reassembly..............................................................................................................20
3.4 Adjustments and calibrations..............................................................................................................21
3.4.1 Invasive pressure calibration.......................................................................................................21
3.4.2 Temperature calibration..............................................................................................................21
4 Troubleshooting 23
4.1 Troubleshooting chart .........................................................................................................................23
4.1.1 Invasive blood pressure ..............................................................................................................23
4.1.2 Temperature ..............................................................................................................................24
4.2 Troubleshooting flowchart ...................................................................................................................25
5 Service Menu 26
5.1 P/PT menu.........................................................................................................................................27
5.2 P/PT calibration menu ........................................................................................................................28
6 Spare Parts 30

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6.1 Pressure Module, M-P, Rev. 00, 01, 02, 03, 04...................................................................................30
6.2 Pressure Temp Module, M-PT, Rev. 00, 01, 02 ....................................................................................31
7 Earlier Revisions 34
APPENDIX A 35
Service check form A-1

TABLE OF FIGURES
Figure 1 Datex-Ohmeda M-PT and M-P Module................................................................................................... 3
Figure 2 Front panel of M-P and M-PT Module..................................................................................................... 7
Figure 3 PT board block diagram ........................................................................................................................ 8
Figure 4 Pressure transducer principle of operation............................................................................................. 9
Figure 5 Temperature measurement principle...................................................................................................10
Figure 6 Serial communication and opto isolation section.................................................................................11
Figure 7 Module bus connector (X1) .................................................................................................................12
Figure 8 Troubleshooting flowchart...................................................................................................................25
Figure 9 Exploded view of the M-P module........................................................................................................30
igure 10 Exploded view of the M-PT module ..................................................................................................32

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda the Pressure Module, M-P, and Pressure Temp Module, M-PT. The M-P and M-PT
modules are single width plug-in modules designed for use with the S/5 monitors. Later in this
manual modules may be refered to without the S/5 system nomenclature for simplicity..
Please also refer to the Technical Reference Manual of the S/5 monitor for information related to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.
Both modules provide invasive pressure measurement. Additionally, the M-PT-module provides
temperature measurement. The M-PT module also has a connector for direct ECG and pressure
signal output.
NOTE: Do not use identical modules in the same monitoring system. The modules M-P and M-PT
are considered as identical modules.

Figure 1 Datex-Ohmeda M-PT and M-P Module

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.35 kg / 0.8 lbs
Power consumption Approximately 3.5 W

1.2 Typical performance

1.2.1 InvBP
Measurement range -40...+320 mmHg
Accuracy ±5 % or ±2 mmHg, whichever is greater
Zero adjustment range ±150 mmHg
Calibration range ±20 %
Scales Upper limit is adjustable between 10 and 300 mmHg in steps of
10. Lower limit is 10 % of selected upper limit below zero.
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40...+320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30...+300 mmHg
HEART RATE FROM ARTERIAL PRESSURE
Measurement range 30...250 bpm
Resolution 1 bpm
Accuracy ±5 bpm or ±5 %, whichever is greater

1.2.2 Temperature
Measurement range 10...45 °C (50...113 °F)
Display resolution 0.1 °C (0.1 °F)
Temperature test Automatic (every 10 min.)
YSI 400 probe compatible

1.2.3 Signal output

ECG out 1 V/mV
Pressure P3 out 1 V/100 mmHg, (0...300 mmHg)

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1.3 Technical specifications

1.3.1 InvBP
Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and input sensitivity 5 µV/V/mmHg
Input voltage 5VDC
max current 20 mA
Nonlinearity <1 %, 0 to 200 mmHg
<2 %, -40 to 0 and 200 to 320 mmHg
Filter 0...4 - 22 Hz adjustable
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time less than 15 sec
Protection against electrical shock Type CF defibrillation proof
DIGITAL DISPLAY AVERAGING
Art and P1 digital displays are averaged over 5 seconds and updated at 5 seconds intervals. All
other pressures have respiration artifact rejection.
NOTE: The accuracy of the measurement may be different from that specified, depending on the
transducer/probe being used. Please check the transducer/probe specification.

1.3.2 Temperature
Measurement accuracy ±0.1 °C (25.0...45.0 °C)
±0.2 °C (10.0...24.9 °C)
Protection against electrical shock Type CF
NOTE: The accuracy of the measurement may be different from the specified, depending on
transducer/probe used. Please check the transducer/probe specification.

1.3.3 Signal output

Max. delay: ECG1 15 ms
Pressure P3 25 ms (0...300 mmHg)
Pressure offset error max. 10 mmHg

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 Invasive blood pressure

To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The transducer is placed at
the same level with the heart, and is electrically zeroed.
The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor
interprets the voltage signal so that pressure data and pressure waveforms can be displayed.

2.1.2 Temperature
The temperature is measured by a probe whose resistance varies when the temperature changes,
called Negative Temperature Coefficient (NTC) resistor.
The resistance can be measured by two complementary methods:
• Applying a constant voltage across the resistor and measuring the current that flows through
it.
• Applying a constant current to flow through the resistor and measuring the voltage that is
generated across it.
In the S/5 module the two methods are combined in the form of a voltage divider. The NTC-resistor
is connected in series with a normal resistor and a constant voltage is applied across them. The
temperature dependent voltage can be detected at the junction of the resistors, thus producing the
temperature signal from the patient. The signal is amplified by analog amplifiers and further
processed by digital electronics.

2.2 Main components

The M-PT module consists of the following main parts:
• PT board
• Two connectors for YSI 400 series temperature probes; temperature channels T3 and T4.
• Nicolay-type connector for an invasive blood pressure sensor; invasive blood pressure
channel P3.
• Key for pressure zeroing.
• DIN-type connector for two direct ECG output signals and pressure 3.
NOTE: These output-signals are non-floating
The M-P module consists of the following main parts:
• PT board
• Nicolay-type connector for an invasive blood pressure sensor; invasive blood pressure
channel P3.

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• Key for pressure zeroing.

Communication between the module and the central unit is established through RS485 serial
interface.
The power supply voltages to the module are generated in the power supply section of the
monitor’s Central Unit. All electrical connections between the module and the Central Unit are
established via 25-pin D-type connector on the backside of the module.

Zero Zero
P3 P3
P3 T3

T4
Signal
Out

P3

Figure 2 Front panel of M-P and M-PT Module

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2.2.1 PT board

Module bus connector, D25

RS485 driver
RS485 driver Power-up Power,
for module
for data reset non-isolated section
reset

ECG OUT
PRESSURE OUT

to output connector

Opto Isolation
Isolation
Patient Isolation transformer

Power,
isolated section

Microprocessor
section

Non-volatile
A/D converter
memory

INV.pressure Temperature
PT_brd_blck_dgrm.vsd

measuring measuring Keyboard

unit unit

to pressure to temperature
sensor sensors

Figure 3 PT board block diagram

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ECG and pressure signal prosessing

The PT-module has the Signal Out connector, for output of analog ECG and pressure signals.
The analog ECG-output signals are made by detecting the pulse-width modulated (PWM) ECG
signal of the module bus. The module detects the presence of pacemaker pulses by following the
ECG module. Every time the pacer pulse has been detected, the microprocessor of the M-PT
module generates a 2.5 ms pacer pulse which is added to the analog ECG signal.
The PRESSURE OUT signal is generated from the P3 invasive pressure signal of the M-PT module.
The P3 signal is transmitted as a pulse width modulated (PWM) signal over the patient isolation.
The analog signal is generated by low-pass filtering the PWM signal.

Microprocessor unit
The microprocessor uses the Intel 80C196KC-16 which includes three A/D converters and a UART.
There are external memories, an 8-bit data bus, a 16 MHz oscillator, an open collector reset, and a
watchdog timer. The internal UART communicates and transfers data between the module and the
CPU board in the monitor.
High speed I/O is used to obtain pulse control sequence necessary for the pulse oximetry
measurement. It receives its timing clock from the oscillator.

Invasive blood pressure measurement unit

An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From
the bridge circuit output a differential voltage, which depends on blood pressure and input supply
voltage, is calculated using the following formula:
Uout = Uin × Pressure × 5 V
where Uin = 5 V
Uout = 25 V × Pressure [mmHg]
Pressure amplification is performed by the instrumentation amplifier. The gain of the amplifier is
set so that the level of the signal transferred to the A/D converter stays within the measurement
range even when there are circumstantial offsets or offsets caused by the pressure transducer. The
input filter before the amplifier attenuates high frequency disturbances.
Pressure
Vin transducer
Instrumentation
amplifier

Vout Input
Filter G
pressure_meas_principle.vsd

to A D converter

Figure 4 Pressure transducer principle of operation

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Temperature measurement unit

The value of the NTC-resistor in the probe depends on the patient’s temperature. It is measured
with the following principle:
The temperature signal(s) is produced by voltage dividers, part of which is the patient probe (YSI
400-series thermistor). The output is amplified by the calibrated amplifier(s) whose offset voltage
makes its output spread on both sides of zero. A wider output range (measurement range) means
better resolution.

+5V reference
0 °C => 7K357
15 °C => 3K541
25 °C => 2K253
38 °C => 1K301

NESTPR_temp_meas_princ.vsd
45 °C => 984R1

A1
to AD
NTC converter

offset

Figure 5 Temperature measurement principle

Serial communication
Serial communication between the module and the Central Unit is via an RS485 type bus whose
buffers get their supply voltage (+5 VDC) from the Central Unit and in the isolation section get the
supply voltage (+5 V) from the isolated power supply.
The communication drivers are controlled by a reset signal such that when the reset is active the
drivers do not transfer data.
Reset is also a RS485 type and additionally, there is an auxiliary logic power reset, which keeps
the reset active for about 500 ms despite the state of reset in the module bus. A time constant
determines the power-up reset time. There are components to prevent the module from sending
data during reset. The data transmission rate is 500 kbps.

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5 kv
Receive data Data

to module prosessor
Send data RS485
Receive data driver NData

to central unit
(module bus)
Send data
Opto isolation Send/receive
Send/receive
Reset Reset in
Reset RS485

serial_comm_opto_isol.vsd
driver NReset in

isolation
Patient

Figure 6 Serial communication and opto isolation section

Isolated section
There are two opto isolators, one for data and one for the reset signal. Signals are processed on
logical high-low levels even though the output of the opto isolators in the isolation section are
analog signals.
The reset line is an open collector type with a pull-up resistor so that the microprocessor is able to
use its internal watchdog function.

Power supply section

The isolated supply voltage of the module is developed from the +15 Vdirty voltage from the
Central Unit. The power supply is a switched-mode circuit, where FET transistor switch is controlled
by an oscillator using bipolar timer. The frequency of the oscillator is about 30 kHz and pulse ratio
50 %. Controlling the FET switch is slowed to suppress spurious interference.
A special pulse transformer is used in the circuit. The transformer secondary circuit uses normal
linear regulators except for +5 V which uses a low drop type linear regulator.

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Figure 7 Module bus connector (X1)

Pin No I/O Signal

1 I RESET_RS485*
2 I -15 VDC*
3 I +15 VDIRTY*
4 I +15 Vin*
5 I/O NDATA_RS485*
6 I/O DATA_RS485*
7 Ground*
8 I NRESET_RS485*
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 Ground*
14 I +32 VDIRTY
15 I GroundDIRTY*
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 ON/STANDBY
21 O PWM_ECG*
22 RXDD_RS232
23 TXDD_RS232
24 I +5 VDCin*
25 I +5 VDC*
* Used in the M-PT module

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2.3.2 Front panel connectors

Pressure connector (P3)

Pin No Signal
3 6 1 Pressure 3 +
1 9
4 7 2 Pressure 3 -
2 0
5 8 3 Polarization - (ground)
4 Polarization +
5 Not connected
6 Not connected
7 Not connected
8 Not connected
9 Ground
10 Cable detection

Signal out connector (Sync. out)

Pin No Signal
2 3 1 ECG out, 1 V/ 1 mV
1 4 2 Pressure out, 1 V/ 100 mmHg
3 ECG out, 1 V/ 1 mV
4 Ground

NOTE: The ECG out signal is not available with modules M-ESTP rev. 01, M-EST rev. 00 and M-ETP
rev. 00.

Temp connector (T1, T2)

Pin No Signal
1 Temperature probe
2 Temperature probe

2.3.3 Other connectors

Keyboard connector (X3)

Pin No Signal Notes X3
1 N/C Not connected
2 COSWITCH Not used
1 5
3 PSWITCH for zeroing of P3
4 fGND Floating GND
5 fGND Floating GND

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Pressure sensor connector (X4)

Pin No Pin No Signal Notes
board fr.panel
1 0 PCABEL 5V if cable not connected X4
2 4 PCURRENT Pulsed supply to sensor
3 3,9 P3- Signal from the sensor 1 5
4 1 P3+ Signal from the sensor
5 2 fGND Floating GND

When the board is used in the M-PT module, there are the following connectors connected on the
board in addition to X1 and X4.

Signal out connector (X5)

Pin No Pin No Signal Notes
board fr.panel
1 - ECG OUT ECG to (e.g.) IABP X5
2 - N/C Not connected
3 4 GND +5VDCin GND 1 8
4 1 ECG OUT ECG to (e.g.) defib.
5 - N/C Not connected
6 3 ECG OUT ECG to (e.g.) IABP
7 2 P OUT P3 to (e.g.) IABP
8 GND GND +5VDCin GND

Connector for temperature probes (X8)

Pin No Signal Notes
1 T3 - X8
2 T4 -
3 fGND Floating GND 1 6
4 CON Low if PT
5 fGND Floating GND
6 GND Floating GND

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-P and M-PT modules is limited to replacing faulty circuit boards or
mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check list should be signed after performing the
procedure.

3.2.1 Recommended tools

Tool Order No. Notes
M-NE(12)STPR/M-ESTPR/M-ESTP Not M-ESTP Rev. 01, M-EST Rev. 00 or M-ETP
Rev. 00
Patient simulator
Pressure manometer
Temperature test set 884515
InvBP transducer
Oscilloscope
Screwdriver

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All modules
• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.

1. Check internal parts:

• screws are tightened properly
• cables are connected properly
• all socket mounted IC’s are inserted properly
• EMC covers are attached properly
• there are no loose objects inside the module

?
2. Check external parts:
• the front cover and the front panel sticker are intact
• all connectors are intact and are attached properly
• the module box, latch and spring locking pin are intact

?
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until the monitoring screen appears.
Configure the monitor screen so that all the needed parameters are shown, for example as
follows:
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - ECG1
Field 2 - P1
Field 3 - P3
Field 4 - P5
Digit Fields
Field 4 - T3+T4
3. Plug in the module. Check that it goes in smoothly and locks up properly.

?
• Preset InvBP measurement settings:
Invasive Pressures - P1 ‘Art’ Setup - Label - Art
P3 Setup - Label – PA

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4. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service - (password 26-23-8)

Take down the information regarding module software by selecting SCROLL VERS and turning
the ComWheel.

?
5. Enter the P/PT service menu (according to the tested module):

Parameters - P/PT

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not increasing
faster than by 5 per second. Check also that the module memories have passed the internal
memory test, i.e. the “RAM”, “ROM” and “EEPROM” show all OK.

?
Invasive blood pressure measurement
6. Check the front panel membrane key.
Press the key at least for one second. Check that the pressed key is identified, i.e. the text for
“Button” changes from OFF to ON in the service menu.

?
7. Check that the “Cable” and “Probe” show OFF.

Plug a cable with an invasive blood pressure transducer into the front panel connector P3.
Check that the “Cable” and “Probe” show ON and the pressure
8. waveform field appears onto the monitor screen..

NOTE: Test both invasive blood pressure channels with M-PP.

?
9. Calibrate the InvBP channel according to the instructions in the Technical Reference
Manual.

?
10. Check that the module configuration is correct with P and PT modules.
The configuration in use is shown beside the text “Configuration” in the service menu and it
can be either BP or PT.

Change the configuration in the CALIBRATIONS -menu, if necessary.

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11. Check the InvBP channels with a patient simulator

The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

SENSITIVITY switch position: 5 µV/V/mmHg

ECG - BASE - BPM - 60

BP - 2 - WAVE - ATM

connect a cable from the channel BP3 to the connector P3.

Ccheck that appropriate InvBP waveform is shown and the InvBP value is approximately
25/10 (±2 mmHg).

?
Modules with temperature measurement
11. Check that the “Cable” and “Probe” show OFF for the channels T3 and T4 when no probes are
connected.

Connect a temperature test plug into the connector T3. Check that the “Cable” and “Probe”
for T3 show ON and the corresponding temperature value appears onto the screen.

Perform the same check also for the channel T4.

?
12. Check the temperature calibrations using temperature test plugs.
If the deviation on a temperature reading on the screen is more then 0.1 °C, calibrate the
temperature channels according to the instructions in the Technical Reference Manual.

?
13. Activate the temperature test by selecting TEMP TEST from the menu and pressing the
ComWheel twice. When the message “Performing temp test” disappears from the digit field
for T3+T4, check that no error messages appear and “Temp error” shows OFF for both
channels in the menu.

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Modules with signal output connector

• Preset InvBP and ECG measurement settings:

Invasive Pressures - P3 Setup - Label - Art

ECG - ECG1 LEAD -I

Connect a patient simulator to the connector P3 and to the connector ECG on the used
M-NE(12)STPR/M-ESTPR/M-ESTP.

The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

SENSITIVITY switch position: 5 µV/V/mmHg

BP - 1 - WAVE - ART

ECG - BASE - BPM - 160

PACE - WAVE - NSR

Use the channel BP1 for the connector P3.

14. Connect an oscilloscope between the signal out connector pins 1 (ECG out) and 4 (Ground).

2 3
1 4

Check that an analog signal which corresponds with the ECG waveform on the screen comes
out. The output signal’s ratio to the actual ECG signal should be around 1V/1mV.

Check that a similar output signal is coming out also from the pin 3 (ECG out).

?
15. Connect the oscilloscope between the signal out connector pins 2 (Pressure out) and 4
(Ground).

Check that an analog signal which corresponds with the InvBP waveform on the screen
comes out. The output signal’s ratio to the actual InvBP signal should be around
1V/100mmHg.

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All modules
16. Perform electrical safety check and leakage current test.

?
17. Check that the module functions normally after the performed electrical safety check.

?
18. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the M-P and M-PT modules in the following way. See the exploded view of the
module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly backwards and detach it from main body. Be careful with loose
latch and spring pin for locking.
3. To detach the PT board. The board can be removed by detaching two screws on the folio
side of the board near the front panel and disconnecting the two ribbon cables coming from
the front panel.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that all cables are connected properly.

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3.4 Adjustments and calibrations

3.4.1 Invasive pressure calibration

Perform pressure calibration whenever the pressure transducer (probe) is replaced with different
type of transducer.
1. Enter P/PT service menu: Monitor Setup - Install/Service - Service - Parameters
2. Enter Calibrations menu.

3. Connect a pressure transducer with a pressure manometer to the P3 connector. Select

Calibrate P3. Leave the transducer to room air pressure.
4. Press the ComWheel to start zeroing.
5. Supply a pressure of 100 mmHg...300 mmHg to the transducer. The recommended pressure
is 200 mmHg.
6. Set the pressure on the display to match the pressure reading on manometer and press the
ComWheel. A tolerance of ±1 mmHg is allowed.
7. The text 'calibrated' will appear on the display.

3.4.2 Temperature calibration

NOTE: For the temperature calibration, separate test plugs (25 °C and 45 °C) are necessary. A test
set of two plugs is available from Datex-Ohmeda, order code 884515.
Performe temperature calibration whenever the measured values deviate more than ±0.1.
1. Enter P/PT service menu (Monitor Setup, Install/Service, Service, Parameters).
2. Enter Calibrations menu.
3. Press the protect button at the bottom of the module and select OFF protect mode. Release
the button.
4. Select Calibrate T3/Calibrate T4.

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5. Insert calibration plug (25 °C) into T3/T4 connector.

6. Press the ComWheel.
7. Insert calibration plug (45 °C) into T3/T4 connector.
8. Press the ComWheel.
9. Press in the protect button at the bottom of the module and select ON protect mode.
Release the button.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

See also the User's Reference Manual for more troubleshooting procedures.

4.1.1 Invasive blood pressure

Trouble Cause Treatment
Abnormally low Transducer wrongly positioned. Check mid-heart level and reposition transducer.
pressure
No pressure Defective transducer. Check transducer.
No pressure module plugged in. Check the module.
No waveform selected on screen. Check selected pressure waveforms by pressing
Monitor Setup key and selecting modify
waveforms.
Check that pressure transducer open to patient.
Not zeroed- Measurement on, channel not zeroed. Zero the channel.
message
Zeroing failed- Unsuccessful zeroing of P3 (number field). Possibly due to pulsating pressure waveform.
message Open the transducer to air and zero the channel.
Offset is > 150 mmHg. Open the transducer to air
and zero the channel.
Defective transducer. Replace it and zero the
channel.
Calibration failed- Unsuccessful calibrating of P3 (number Turn the transducer to sphygmomanometer and
message field), possibly due to pulsating waveform. try again (zeroing takes place first).
Gain is beyond the limits (±20 % of the default
gain). Replace the transducer.
Out of range ≤40 Measurement pressure is beyond Check transducer level. Zero the channel.
mmHg measurement range.
Out of range >320 Measurement pressure is beyond Check transducer level. Zero the channel. The
mmHg measurement range. patient may also have high pressure.
Zero adj. >100 Offset when zeroing is >100 mmHg (but Check transducer. The waveform may hit the top
mmHg <150 mmHg) from the absolute zero of the and the numeric display not shown.
module (with default gain).
Out of range Measured pressure is beyond the internal The waveform hits the top and the numeric
measurement range of the module. display not shown. Check transducer and its
level. Zero the channel.

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4.1.2 Temperature
Trouble Cause Treatment
Message Faulty calibration. Perform calibration. If it does not
help, check that front panel
'TEMPERATURE ERROR'
connectors are properly connected to
STP board.
No temperature displayed Wrong type of probe. Use correct probe.
Temperature out of measurable range. The range is between 10 and 45 °C.
Temperature calibration not protected. Set the Protection ON in the Service
Menu.

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4.2 Troubleshooting flowchart

Possibly faulty
M-P/PT module

Take all modules

out of the frame

Insert M-P/PT and

turn the power on

Does fault No Fault not in M-P/

still appear? PT module

Yes

Enter the Service

menu
No

Module-ID No Does another

on screen? module work
in the same
slot?
Yes
Yes

Check front panel key

functions in Service Replace the PT
menu board

Do they Yes Yes

Has EEPROM Replace the PT
work? failed board
OK
?
No No

Check front panel unit No

Has Temp Yes Recalibrate the
and PT board to measurement
find culprit. failed? temp channels Replace the PT
board
Replace if necessary.
PT_trblsh_flowch.vsd

No No

Has InvBP Yes Recalibrate the OK

measurement InvBP channel ?
failed

Figure 8 Troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters.
5. Select P/PT module.

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5.1 P/PT menu

Calibrations See section 5.2 “Calibrations menu.”

Record Data Record Data prints out the shown service data and board information (id., serial number, and
software id.) onto the recorder module, M-REC.
Service Data Gain is a coefficient to compensate gain error. Usually the value for P3 is between 17000 and
25000 and for T3 and T4 between 13000 and 14300. Zero indicates offset compensation value
of each parameter in A/D converter. Typically the values for P3 is within ±1000 and for T3 and T4
between -150 and +300. Calibrate if zero and/or gain value is outside the ranges.
Cable shows ON when the corresponding cable is connected to the front panel and Probe shows
ON when the corresponding probe is connected to the cable.
Under Value the measured numeric values are displayed simultaneously. Pressure value is a real
time value and shown in mmHg.
Button; the front panel key function can be confirmed by pressing the key and checking that OFF
turns to ON.
Temp error shows whether the calibration of the temperature was successful or not.
Protect key shows normally OFF but turns to ON when the button at the bottom of the module is
pressed.
Protect mode is normally ON. It turns to OFF when Protect is switched to OFF for the temperature
calibration in Calibration Menu.
Configuration shows the chosen module configuration: BP or PT.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is also a cumulative number that indicates how many times communication from
the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero

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values do not indicate a failure, but the continuous counting (more than 5 per second) during the
normal operation indicates either serial communication failure or module not in place.
RAM indicates the state of the RAM memory. ROM indicates whether the checksum in the EPROM
is in accordance with the one the software has calculated. EEPROM indicates if the values stored
in the permanent memory are valid. The state is either OK, Fail or ? (module not in place or a
communication error).

5.2 P/PT calibration menu

Protection Protection for the configuration and temperature calibrations can be set ON and OFF only when
protect button at the bottom of the module is pressed.
Set Config The module configuration should be set according to the module type. The setting is possible only
when the protection is set OFF. The available selections are BP or PT.
The configuration setting should be checked if the PT board is replaced.
Calibrate T3 and Calibrate T4
The functions are for calibrating the temperature channels T3 and T4. The calibrations are possible
only when the protection is set OFF. The temperature calibration requires accurate test plugs of
value 25 °C and 45 °C.
Calibration:
1. Select Calibrate T3 / Calibrate T4
2. Insert the test plug 25 °C into the T3 / T4 connector
3. Press the ComWheel
4. Insert the test plug 45 °C into the T3 / T4 connector
5. Press the ComWheel
Calibrate P3 The function is for calibrating the invasive blood pressure channel P3.
The calibration requires a pressure transducer (with an appropriate cable) and a pressure
manometer.

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Calibration:
1. Connect the pressure transducer with the pressure manometer to the P3 connector. Select
Calibrate P3. Leave the transducer to room air pressure.
2. Press the ComWheel to start zeroing.
3. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
4. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel.

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6 SPARE PARTS
NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1 Pressure Module, M-P, Rev. 00, 01, 02, 03, 04

Figure 9 Exploded view of the M-P module

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel unit (M-P) 880044
6 PT board, M-PT, M-P 885697 895047
6 PT board, M-PT (rev.01), M-P (rev.03) 895047
6 STP board, M-ESTP (rev.01), M-P (rev.00-01) 880339
6 STP-board, M-ESTP (rev 03-05), M-P (rev .02) 882627
10 Front Panel sticker, DA ; M-P (rev.00-03) 892211 898744
10 Front Panel sticker, DA ; M-P (rev.04) ; S/5 898744
10 Front Panel sticker, DE ; M-P (rev.00-03) 880488 898735
10 Front Panel sticker, DE ; M-P (rev.04) ; S/5 898735
10 Front Panel sticker, EN ; M-P (rev.00-03) 880139 898734
10 Front Panel sticker, EN, PT ; M-P (rev.04) ; S/5 898734
10 Front Panel sticker, EN, PT ; M-P (rev.04) ; S/5 898734
10 Front Panel sticker, ES ; M-P (rev.00-03) 884201 898738
10 Front Panel sticker, ES ; M-P (rev.04) ; S/5 898738
10 Front Panel sticker, FI ; M-P (rev.00-03) 888863 898741
10 Front Panel sticker, FI ; M-P (rev.04) ; S/5 898741

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Item Description Order No. Replaced by

10 Front Panel sticker, FR ; M-P (rev.00-03) 880130 898736
10 Front Panel sticker, FR ; M-P (rev.04) ; S/5 898736
10 Front Panel sticker, IT ; M-P (rev.00-03) 886756 898739
10 Front Panel sticker, IT ; M-P (rev.04) ; S/5 898739
10 Front Panel sticker, JA ; M-P (rev.00-03) 888308 898745
10 Front Panel sticker, JA ; M-P (rev.04) ; S/5 898745
10 Front Panel sticker, NL ; M-P (rev.00-03) 886063 898737
10 Front Panel sticker, NL ; M-P (rev.04) ; S/5 898737
10 Front Panel sticker, NO ; M-P (rev.00-03) 893569 898743
10 Front Panel sticker, NO ; M-P (rev.04) ; S/5 898743
10 Front Panel sticker, PT ; M-P (rev.04) ; S/5 898740 898734
10 Front Panel sticker, SV ; M-P (rev.00-03) 885847 898742
10 Front Panel sticker, SV ; M-P (rev.04) ; S/5 898742
11 Metal frame 879184
13 Cross cylinder-head screw M3x6 61721
14 Cross cylinder-head scerw M3x12 628700
15 Cross cylinder-head screw M3x16 628710
16 Shakeproof washer m3.2 63611
19 EMC cover 884099
20 Protection plate 883946
21 Insulating plate for 883946 884121

6.2 Pressure Temp Module, M-PT, Rev. 00, 01, 02

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel frame (M-PT) 883801

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F
igure 10 Exploded view of the M-PT module

Item Description Order No. Replaced by

6 PT board, M-PT, M-P 885697 895047
6 PT board, M-PT (rev.01), M-P (rev.03) 895047
6 STP board, M-ESTP (rev.01), M-P (rev.00-01) 880339
6 STP-board, M-ESTP (rev 03-05), M-P (rev .02) 882627
7 Signal out connector, M-PT 884316
8 T-Input connectors 884315
9 P-Input connector 884314
10 Front Panel sticker, DA ; M-PT (rev.00-01) 892210 898768
10 Front Panel sticker, DA ; M-PT (rev.02) ; S/5 898768
10 Front Panel sticker, DE ; M-PT (rev.00-01) 885035 898759
10 Front Panel sticker, DE ; M-PT (rev.02) ; S/5 898759
10 Front Panel sticker, EN ; M-PT (rev.00-01) 884004 898758
10 Front Panel sticker, EN ; M-PT (rev.02) ; S/5 898758
10 Front Panel sticker, ES ; M-PT (rev.00-01) 886193 898762
10 Front Panel sticker, ES ; M-PT (rev.02) ; S/5 898762
10 Front Panel sticker, FI ; M-PT (rev.00-01) 888864 898765
10 Front Panel sticker, FI ; M-PT (rev.02) ; S/5 898765
10 Front Panel sticker, FR ; M-PT (rev.00-01) 885033 898760
10 Front Panel sticker, FR ; M-PT (rev.02) ; S/5 898760
10 Front Panel sticker, IT ; M-PT (rev.00-01) 886758 898763

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Item Description Order No. Replaced by

10 Front Panel sticker, IT ; M-PT (rev.02) ; S/5 898763
10 Front Panel sticker, JA ; M-PT (rev.00-01) 888307 898769
10 Front Panel sticker, JA ; M-PT (rev.02) ; S/5 898769
10 Front Panel sticker, NL ; M-PT (rev.00-01) 886330 898761
10 Front Panel sticker, NL ; M-PT (rev.02) ; S/5 898761
10 Front Panel sticker, NO ; M-PT (rev.00-01) 893571 898767
10 Front Panel sticker, NO ; M-PT (rev.02) ; S/5 898767
10 Front Panel sticker, PT ; M-PT (rev.00-01) 895237 898764
10 Front Panel sticker, PT ; M-PT (rev.02) ; S/5 898764
10 Front Panel sticker, SV ; M-PT (rev.00-01) 885845 898766
10 Front Panel sticker, SV ; M-PT (rev.02) ; S/5 898766
11 Metal frame 879184
13 Cross cylinder-head screw M3x6 61721
14 Cross cylinder-head scerw M3x12 628700
15 Cross cylinder-head screw M3x16 628710
16 Shakeproof washer m3.2 63611
17 Membrane keypad 880101
18 Front panel frame, M-PT 883801
19 EMC cover 884099
20 Protection plate 883946
21 Insulating plate for 883946 884121

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7 EARLIER REVISIONS
This manual also supports M-P revisions 02 and 03.
For service information on the earlier revisions, please refer to:
P Module revision 00 Service Manual p/n 880850
P Module revision 01 Service Manual p/n 882580

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APPENDIX A

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 APPENDIX A, Service Check Form, M-P and M-PT

SERVICE CHECK FORM

Pressure Modules, M-P, M-PT

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules
OK N.A. Fail OK N.A. Fail
1. Internal parts 2. External parts

3. Installation

Notes

4. Module software P
PT
5. Communication and
memories
Notes

InvBP measurement
6. Membrane keys 7. Cable and transducer
detection
8. Calibration 9. Configuration BP/PT

10. Test with patient

simulator
Notes

A-1(2)
Document No. 8001013-3
Datex-Ohmeda S/5 monitors

OK = Test OK N.A. = Test not applicable Fail = Test Failed

TEMP measurement
11. Temperature probe detection 12. Calibration check

13. Temp test -function

Notes

Signal output
14. ECG output 15. InvBP output

Notes

All modules
16. Electrical safety check 17. Functioning after
electrical safety
check
18. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 8001013-4
 Datex-Ohmeda
S/5TM Dual Pressure Module, M-PP (Rev. 01)
Technical Reference Manual

All specifications are subject to change without notice.

Document No. 8001014-4

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Dual Pressure Module, M-PP
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 2
1.1 General specifications ..........................................................................................................................2
1.2 Typical performance .............................................................................................................................2
1.3 Technical specifications........................................................................................................................2
2 Functional Description 3
2.1 Measurement principle .........................................................................................................................3
2.2 Main components.................................................................................................................................3
2.2.1 PP board......................................................................................................................................4
2.3 Connectors and signals.........................................................................................................................7
2.3.1 Module bus connector..................................................................................................................7
2.3.2 Front panel connectors.................................................................................................................8
2.3.3 Other connectors..........................................................................................................................8
3 Service Procedures 9
3.1 General service information...................................................................................................................9
3.2 Service check .....................................................................................................................................10
3.2.1 Recommended tools ..................................................................................................................10
3.3 Disassembly and reassembly..............................................................................................................13
3.4 Adjustments and calibrations..............................................................................................................14
3.4.1 Invasive pressure calibration.......................................................................................................14
4 Troubleshooting 15
4.1 Troubleshooting chart .........................................................................................................................15
4.2 Troubleshooting flowchart ...................................................................................................................16
5 Service Menu 17
5.1 PP menu............................................................................................................................................18
5.2 PP calibrations menu..........................................................................................................................19
6 Spare Parts 20
6.1 Dual Pressure Module, M-PP, Rev. 00, 01............................................................................................20
7 Earlier Revisions 22
APPENDIX A 23
Service check form A-1

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TABLE OF FIGURES
Figure 1 Dual Pressure Module, M-PP................................................................................................................. 1
Figure 2 Dual Pressure Module, M-PP, front panel............................................................................................... 3
Figure 3 PP board block diagram........................................................................................................................ 4
Figure 4 Pressure transducer principle of operation............................................................................................. 5
Figure 5 Serial communication and opto isolation sections ................................................................................. 6
Figure 6 Module bus connector (X1) ................................................................................................................... 7
Figure 7 M-PP troubleshooting flowchart ..........................................................................................................16
Figure 8 Exploded view of M-PP........................................................................................................................20

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Dual Pressure Module, M-PP. The M-PP module is a single width plug-in
module designed for use with the S/5 monitors. The Dual Pressure module provides invasive blood
pressure (InvBP) measurement.
Later in this manual modules may be refered to without the S/5 system nomenclature for
simplicity.

Please also refer to the Technical Reference Manual of the S/5 monitor for information related to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.

Figure 1 Dual Pressure Module, M-PP

NOTE: The Dual Pressure Module, M-PP functions only with monitor software of level 97 and newer.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.35 kg / 0.8 lbs
Power consumption approximately 3.5 W

1.2 Typical performance

Measurement range -40...+320 mmHg
Accuracy ±5 % or ±2 mmHg, whichever is greater
Zero adjustment range ±150 mmHg
Calibration range ±20 %
Scales Upper limit is adjustable between 10 and 300 mmHg in steps of
10. Lower limit is 10 % of selected upper limit below zero.
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40...+320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30...+300 mmHg
HEART RATE FROM ARTERIAL PRESSURE
Measurement range 30...250 bpm
Resolution 1 bpm
Accuracy ±5 bpm or ±5 %, whichever is greater

1.3 Technical specifications

Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and input sensitivity 5 µV/V/mmHg, 5 VDC, 20 mA max current
Nonlinearity < 1 %, 0...200 mmHg
< 2 %, -40...0 and 200...320 mmHg
Filter 0...4 - 22 Hz adjustable
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time < 15 sec
Protection against electrical shock Type CF defibrillation proof
DIGITAL DISPLAY AVERAGING
Art and P1 digital displays are averaged over 5 seconds and updated at 5 second intervals. All
other pressures have respiration artifact rejection.
NOTE: The accuracy of the measurement may be different from that specified, depending on the
transducer/probe being used. Please check the transducer/probe specification.

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The transducer is placed at
the same level with the heart, and is electrically zeroed.
The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor
interprets the voltage signal so that pressure data and pressure waveforms can be displayed.

2.2 Main components

The main components of the Dual Pressure Module, M-PP, are a PP circuit board, a front panel and
a box. The front panel includes two Nicolay-type connectors, P5 and P6, and two direct function
keys, Zero P5 and Zero P6 for pressure zeroing.
Communication between the Dual Pressure Module and the Central Unit is via an RS485 serial
interface.
The power supply voltages to the Dual Pressure Module are generated in the power supply section
of the Central Unit. All electrical connections between the Dual Pressure Module and the Central
Unit are via a 25-pin D-connector at the back of the module.

Zero
P5

P5
Zero
P6

P6

Figure 2 Dual Pressure Module, M-PP, front panel

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2.2.1 PP board

Module bus connector

Module data Module reset Power for Power for
Communication module

RS485 Driver RS485 Driver Power

for data for module non-isolation
reset Power
reset section

Isolation
Opto isolation Patient isolation transformer

Reset
µprocessor Power
Module RAM internal 2K isolation
bus data external 16K section
EPROM 48K
RS communication
Non volatile
memory

AD-converter
-8 chn
-12bit

Press AD

INV Front panel

PRESS keys
measuring
unit
PP_brd_blck_dgrm.vsd

Patient connectors

Figure 3 PP board block diagram

Microprocessor unit
The microprocessor uses the Intel 80C196KC-16 CPU which includes three A/D converters and a
UART. The microprocessor uses external memories, an 8-bit data bus, a 16 MHz oscillator, an open
collector reset, and a watchdog timer. The three A/D-converters within the CPU convert the analog
input signals to digital. The internal UART communicates and transfers data between the module
and the CPU board in the monitor.High speed I/O is used to obtain the pulse control sequence
necessary for pulse oximetry measurement. It receives its timing clock signal from the 16 MHz
oscillator.

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 Dual Pressure Module, M-PP

Invasive blood pressure measurement unit

An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From
the bridge circuit output a differential voltage, which depends on blood pressure and input supply
voltage, is calculated using the following formula:
Uout = Uin × Pressure × 5 V
where Uin = 5 V
Uout = 25 V × Pressure [mmHg]
Pressure amplification is performed by the instrumentation amplifier. The gain of the amplifier is
set so that the level of the signal transferred to the A/D converter stays within the measurement
range even when there are circumstantial offsets or offsets caused by the pressure transducer. The
input filter before the amplifier attenuates high frequency disturbances.
Pressure
Vin transducer
Instrumentation
amplifier

Vout Input
G

pressure_meas_principle.vsd
Filter
to A D converter

Figure 4 Pressure transducer principle of operation

Serial communication
Serial communication between the Dual Pressure Module and the Central Unit is via an RS485
type bus. The communication bus drivers are powered from the Central Unit Module Bus. The
module isolation section (+5 V) is powered from the isolated power supply.
The buffers of the serial communication drivers are controlled by a reset signal such that when the
reset is active the drivers do not transfer data.
In addition to the RS485 reset there is a logic power-up reset, which holds for approximately 500
ms regardless of the state of the RS485 reset. A time constant determines the power-up reset time.
The power-up reset also prevents the module from sending data to the Module Bus. The data
transmission rate is 500 kbps.

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5 kv
Receive data Data
to module prosessor Send data RS485
Receive data driver NData

to central unit
(module bus)
Send data
Opto isolation Send/receive
Send/receive
Reset Reset in
Reset RS485

serial_comm_opto_isol.vsd
driver NReset in

isolation
Patient

Figure 5 Serial communication and opto isolation sections

Isolated section
There are two opto isolators, one for data and one for the reset signal. Signals are processed on
logical high-low levels even though the output of the opto isolators in the isolation section are
analog signals.
The reset line is an open collector type with a pull-up resistor so that the microprocessor is able to
use its internal watch-dog function.

Power supply section

The module isolated supply voltage is developed from the +15 Vdirty (non-isolated) supply from
the Central Unit power supply.
The isolated power supply is a switched-mode circuit, where an FET switch is controlled by an
oscillator using a bipolar timer. The frequency of the oscillator is approximately 30 kHz with a pulse
ratio of 50 %; switching of the FET switch is slow to suppress spurious interference.
A special isolation pulse transformer is used in the circuit. The transformer secondary circuit uses
normal linear regulators except for +5 V which uses a low drop type linear regulator.

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Figure 6 Module bus connector (X1)

Pin No I/O Signal

1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 Vin
5 I/O NDATA_RS485
6 I/O DATA_RS485
7 Ground
8 I NRESET_RS485
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 Ground
14 I +32 VDIRTY
15 I GroundDIRTY
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 ON/STANDBY
21 O PWM_ECG
22 RXDD_RS232
23 TXDD_RS232
24 I +5 VDCin
25 I +5 VDC

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2.3.2 Front panel connectors

Pressure connectors (P5, P6)

3 6
1 9
4 7
2 0
5 8

Pin no. Signal

1 Pressure 5/6 +
2 Pressure 5/6 -
3 Polarization - (ground)
4 Polarization +
5 Not connected
6 Not connected
7 Not connected
8 Not connected
9 Ground
10 Cable detection

2.3.3 Other connectors

Keyboard connector (X3)

Pin no. Signal Notes X3
1 N/C Not connected
2 PSWITCH for zeroing of P5
1 5
3 PSWITCH for zeroing of P6
4 fGND Floating GND
5 fGND Floating GND

Pressure sensor connector (X4)

Pin no. Pin no. Signal Notes X4
Board fr.panel
1 0 PCABEL 5V if cable not connected
1 5
2 4 PCURRENT Pulsed supply to sensor
3 3,9 P- Signal from the sensor
4 1 P+ Signal from the sensor
5 2 fGND Floating GND

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the Dual Pressure Module, M-PP, is limited to replacing faulty circuit boards or
mechanical parts. Faulty circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form which should be filled in when performing the procedures.

The mark ? in the instructions means that the check list should be signed after performing the
procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Patient simulator
Pressure manometer
InvBP transducer
Screwdriver
• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.

1. Check internal parts:

• screws are tightened properly
• cables are connected properly
• all socket mounted IC’s are inserted properly
• EMC covers are attached properly
• there are no loose objects inside the module

?
2. Check external parts:
• the front cover and the front panel sticker are intact
• all connectors are intact and are attached properly
• the module box, latch and spring locking pin are intact

?
• Reattach the module box and check that the latch is moving properly.

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• Turn the monitor on and wait until the monitoring screen appears.
Configure the monitor screen so that all the required parameters are shown, for
example:

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 4 - P5

Field 5 - P6
3. Plug in the module, M-PP. Check that it goes in smoothly and locks up properly.

?
• Preset the InvBP measurement settings:

Invasive Pressures - P5 Setup - Label - P5

P6 Setup - Label - P6
4. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service View (password 26-23-

8)

Take down the information regarding PP module software by selecting SCROLL VERS and
turning the ComWheel.

?
5. Enter the PP module service menu (according to the module being tested):

Modules - PP

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not
increasing faster than by 5 per second. Check that the module memories have passed the
internal memory test, i.e. “RAM”, “ROM” and “EEPROM” all show OK.

?
6. Check the front panel membrane keys.
Press each of the keys for at least one second. Check that the key being pressed is
identified, i.e. the text on the service menu for “Button” changes from OFF to ON.

?
7. Check that “Cable” and “Probe” show OFF.

Plug the cable from an invasive blood pressure transducer into front panel connector P5.
Check that the corresponding “Cable” and “Probe” messages show ON and the correct
pressure waveform field appears on the monitor screen.

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8. Calibrate the InvBP channels according to the instructions in the Technical Reference
Manual.

?
9. Check the InvBP channels with a patient simulator.

The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are:

SENSITIVITY switch position: 5 µV/V/mmHg

ECG - BASE - BPM - 60

BP - 2 - WAVE - ATM

3 - WAVE - ATM

Connect channel BP2 to connector P5 and channel BP3 to connector P6.

Zero the InvBP channels by pressing the zeroing keys on the module front panel.

BP - 2 - WAVE - CVP
3 - WAVE - PA

Check that appropriate InvBP waveforms are shown and the InvBP values are approximately
15/10 mmHg (±2 mmHg) for channel P5 and 25/10 (±2 mmHg) for channel P6.

?
10. Perform an electrical safety check and a leakage current test.

?
11. Check that the module functions normally after performing the electrical safety check.

?
12. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

Disassemble the Dual Pressure Module, M-PP, in the following way. See the exploded view of the
module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly backwards and remove it from the main body. Be careful with the
loose latch and spring locking pin.
3. To detach the PP board, remove the two screws, and disconnect the two ribbon cables from
the front panel.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that all cables are connected properly.

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3.4 Adjustments and calibrations

3.4.1 Invasive pressure calibration

Perform a pressure calibration whenever the pressure transducer (probe) is replaced with different
type of transducer.
1. Enter the PP service menu (Monitor Setup - Install/Service - Service - Parameters).
2. Enter the Calibrations menu.

3. Connect a pressure transducer with a pressure manometer to the P5/P6 connector. Select
Calibrate P5 or Calibrate P6 from the menu. Leave the transducer at room air pressure.
4. Press the ComWheel to start zeroing.
5. Supply a pressure of 100 mmHg...300 mmHg to the transducer. The recommended pressure
is 200 mmHg.
6. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel. A tolerance of ±1 mmHg is allowed.
7. The text 'calibrated' will appear on the display.

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4 TROUBLESHOOTING
See also the User's Reference Manual for more troubleshooting procedures.

4.1 Troubleshooting chart

Trouble Cause Treatment
Abnormally low Transducer wrongly positioned. Check mid-heart level and reposition transducer.
pressure
No pressure Defective transducer. Check the transducer.
No pressure module plugged in. Check the module.
No selected waveform on screen. Check selected pressure waveforms by pressing
Monitor Setup key and selecting modify
waveforms.
Check that pressure transducer open to patient.
“Not zeroed” Measurement on, channel not zeroed. Zero the channel.
message
Zeroing failed- Unsuccessful zeroing of P5 /P6 (number Open the transducer to air and zero the channel.
message field), possibly due to pulsating pressure
waveform.
Offset is > 150 mmHg. Open the transducer to air and zero the channel.
Defective transducer. Replace the transducer and zero the channel.
Calibration failed- Unsuccessful calibration of P5/P6 Turn the transducer to sphygmomanometer and
message (number field), possibly due to pulsating try again (zeroing takes place first).
waveform
Replace the transducer.
Gain is beyond the limits (± 20 % of the
default gain).
Out of range < 40 Pressure measurement is beyond Check the transducer level. Zero the channel.
mmHg measurement range.
Out of range > Pressure measurement is beyond Check the transducer level. Zero the channel. The
320 mmHg measurement range. patient may also have high blood pressure.
Zero adj. > 100 Offset when zeroing is > 100 mmHg (but < Check the transducer.
mmHg 150 mmHg) from the absolute zero of the
module (with default gain). The waveform
may hit the top of the screen and the
numeric display not shown.
Out of range Measured pressure is beyond the internal Check the transducer and its level.
measurement range of the module. The
waveform may hit the top of the screen and Zero the channel.
the numeric display not shown.

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4.2 Troubleshooting flowchart

Possibly faulty
M-PP module

Take all modules

out of the frame

Insert M-PP module

and turn the power on

Does fault No
Fault not in M-PP module
still appear?

Yes

Enter the Service

menu

No

No Does another
Module-ID
on screen? module work in
the same slot?

Yes Yes

Check front panel key

functions in Service
menu Replace the PP board

Do they Yes Yes Replace the PP

Has EEPROM
work? board
failed?
PP_trblsh_flowch.vsd

No No

Check front panel unit Has InvBP

and PP board to Yes Replace the PP
measurement
find fault. Replace if board
failed?
necessary.

Figure 7 M-PP troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters.
5. Select PP module.

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5.1 PP menu

Calibrations See section 5.2 “PP Calibrations Menu.”

Record Data Record Data prints out the service data and circuit board information (id., serial number, and
software id.) on the Recorder Module, M-REC.
Service Data Gain is a coefficient to compensate for gain error. Usually the values for P5 and P6 are between
17000 and 25000.
Zero indicates the offset compensation value for each parameter in the A/D converter. Typically
the values for P5 and P6 are within ±1000. Calibrate if the zero and/or gain value is outside the
ranges.
Cable shows ON when the corresponding cable is connected to the front panel and Probe shows
ON when the corresponding probe is connected to the cable.
Value displays the measured numeric values simultaneously. Pressure value is a real time value
and shown in mmHg.
Button; the front panel key function can be confirmed by pressing the key and checking that OFF
turns to ON.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to the monitor has failed. Bad c-s by mod is a cumulative number
that indicates how many communication errors the module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) during
normal operation indicates either a serial communication failure or the module is not in place.
RAM indicates the state of the RAM memory. ROM indicates whether the checksum in the EPROM
is in accordance with the software calculated value. EEPROM indicates whether the values stored
in the permanent memory are valid. The state is either OK, Fail or ? (module not in place or a
communication error).

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5.2 PP calibrations menu

Calibrate P5 and Calibrate P6

These functions are for calibrating invasive blood pressure channels P5 and P6. The calibrations
require a pressure transducer (with an appropriate cable) and a pressure manometer.
Calibration:
1. Connect the pressure transducer with the pressure manometer to the P5 / P6 connector.
Select Calibrate P5 / Calibrate P6. Leave the transducer at room air pressure.
2. Push the ComWheel to start zeroing.
3. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
4. Set the pressure on the display to match the pressure reading on the manometer and push
the ComWheel.

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6 SPARE PARTS
NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1 Dual Pressure Module, M-PP, Rev. 00, 01

Figure 8 Exploded view of M-PP

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 PP board, M-PP (Rev.00-01) 8000998
6 Cross cylinder-head screw M3x6 61721
7 Metal frame 891034
8 PP input board, M-PP 891308
9 Flat cable, M-PP 891573
10 Cross cylinder-head scerw M3x12 628700
11 Fitting plate 879510
12 Membrane keypad 880101
13 SP-Front mask 879094
14 Front Panel sticker, DA ; M-PP (rev.00) 892212 898756
14 Front Panel sticker, DA ; M-PP (rev.01) ; S/5 898756
14 Front Panel sticker, DE ; M-PP (rev.00) 891293 898747

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Item Description Order No. Replaced by

14 Front Panel sticker, DE ; M-PP (rev.01) ; S/5 898747
14 Front Panel sticker, EN ; M-PP (rev.00) 889463 898746
14 Front Panel sticker, EN / PT ; M-PP (rev.01) ; S/5 898746
14 Front Panel sticker, EN / PT ; M-PP (rev.01) ; S/5 898746
14 Front Panel sticker, ES ; M-PP (rev.00) 891298 898750
14 Front Panel sticker, ES ; M-PP (rev.01) ; S/5 898750
14 Front Panel sticker, FI ; M-PP (rev.00) 891297 898753
14 Front Panel sticker, FI ; M-PP (rev.01) ; S/5 898753
14 Front Panel sticker, FR ; M-PP (rev.00) 891294 898748
14 Front Panel sticker, FR ; M-PP (rev.01) ; S/5 898748
14 Front Panel sticker, IT ; M-PP (rev.00) 891299 898751
14 Front Panel sticker, IT ; M-PP (rev.01) ; S/5 898751
14 Front Panel sticker, JA ; M-PP (rev.00) 894966 898757
14 Front Panel sticker, JA ; M-PP (rev.01) ; S/5 898757
14 Front Panel sticker, NL ; M-PP (rev.00) 891295 898749
14 Front Panel sticker, NL ; M-PP (rev.01) ; S/5 898749
14 Front Panel sticker, NO ; M-PP (rev.00) 893570 898755
14 Front Panel sticker, NO ; M-PP (rev.01) ; S/5 898755
14 Front Panel sticker, PT ; M-PP (rev.00) 895238 898746
14 Front Panel sticker, SV ; M-PP (rev.00) 891296 898754
14 Front Panel sticker, SV ; M-PP (rev.01) ; S/5 898754

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7 EARLIER REVISIONS
This manual also supports the earlier revisions of the Dual Pressure Module, M-PP

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APPENDIX A

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 APPENDIX A, Service check form, M-PP

SERVICE CHECK FORM

Dual Pressure Module, M-PP

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation

4. Module software PP
5. Communication and
memories

6. Membrane keys 7. Cable and transducer

detection
8. Calibration 9. Test with patient
simulator

10. Electrical safety check 11. Functioning after

electrical safety check
12. Final cleaning

Notes

Used Spare Parts

Signature

A1 (1)
Document No. 8001014-4
Datex-Ohmeda S/5 monitors

Document No 8001014-4
 Datex-Ohmeda
S/5TM NIBP Module, M-NIBP (Rev. 05)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1015-5

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
NIBP Module, M-NIBP
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 2
1.1 General specifications ..............................................................................................................................2
1.2 Typical performance .................................................................................................................................2
1.3 Technical specifications............................................................................................................................2
2 Functional Description 4
2.1 Measurement principle .............................................................................................................................4
2.2 Main components.....................................................................................................................................4
2.2.1 NIBP board ......................................................................................................................................5
2.3 Connectors and signals.............................................................................................................................7
2.3.1 Module bus connector ......................................................................................................................7
2.3.2 Test points .......................................................................................................................................8
3 Service Procedures 9
3.1 General service information.......................................................................................................................9
3.2 Service check .........................................................................................................................................10
3.2.1 Recommended tools ......................................................................................................................10
3.2.2 Recommended parts ......................................................................................................................10
3.3 Disassembly and reassembly..................................................................................................................16
3.4 Adjustments and calibrations..................................................................................................................17
3.4.1 Pressure safety level detection “OFFSET” .........................................................................................17
3.4.2 NIBP calibrations............................................................................................................................17
4 Troubleshooting 20
4.1 Troubleshooting chart .............................................................................................................................20
4.2 NIBP error code explanation ....................................................................................................................22
4.3 Troubleshooting flowchart .......................................................................................................................23
5 Service Menu 24
5.1 NIBP Service menu .................................................................................................................................25
5.1.1 NIBP Demo menu...........................................................................................................................26
5.1.2 NIBP Calibration menu ...................................................................................................................27
5.1.3 NIBP Safety Valve menu .................................................................................................................28
5.1.4 NIBP Pulse Valve menu...................................................................................................................29
5.1.5 NIBP Buttons/Leds menu ...............................................................................................................30
5.1.6 NIBP Pneumatics menu ..................................................................................................................31
5.1.7 NIBP Watchdog menu.....................................................................................................................32
6 Spare Parts 33
6.1 NIBP Module box ....................................................................................................................................33
6.2 NIBP Module Rev. 00-03 ........................................................................................................................35
6.3 NIBP Module Rev. 04..............................................................................................................................36

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7 Earlier Revisions 38
APPENDIX A 39
Service check form 1

TABLE OF FIGURES
Figure 1 Non-invasive blood pressure Module, M-NIBP ....................................................................................... 1
Figure 2 Front panel of NIBP Module .................................................................................................................. 4
Figure 3 NIBP board functional block diagram .................................................................................................... 5
Figure 4 NIBP Module troubleshooting flowchart...............................................................................................23
Figure 5 Exploded view of the M-NIBP module box ............................................................................................33
Figure 6 Exploded view of the M-NIBP module, rev. 00-03 ................................................................................34
Figure 7 Exploded view of the M-NIBP module, rev.04.......................................................................................36

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 NIBP module, M-NIBP. The Non-Invasive Blood Pressure parameter module,
M-NIBP is a double width plug-in module designed for use with the S/5 monitors. Later in this
manual modules may be referred to w/o the system name S/5 for simplicity.
Please also refer to the Technical Reference Manual of the S/5 monitor for information related to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.

Figure 1 Non-invasive blood pressure Module, M-NIBP

NOTE: Do not use identical modules in the same monitor simultaneously. The M-NIBP and M-
NE(12)STPR/-NESTR/-NETPR/M-MRI/M-MRIP are considered as identical modules.
NOTE: Non-invasive blood pressure Module, M-NIBP functions with all monitor software levels from
93 and newer.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 75 × 180 × 112 mm/3.0 × 7.1 × 4.4 in
Module weight 0.7 kg/1.5 lbs
Power consumption about 4 W

1.2 Typical performance

Oscillometric measurement principle.
Measurement range adult 25...260 mmHg
child 25...195 mmHg
infant 15...145 mmHg
Accepted HR 30...250 bpm
Measurement interval 1, 2.5, 3, 5, 10, 15, 30, 60 min (=1h), 2h, 4h
Measurement time, typical adult 23 s
infant 20 s
Initial inflation pressure adult 185 ±10 mmHg
child 150 ±10 mmHg
infant 120 ±10 mmHg
Venous stasis adult 80 ±10 mmHg / 2 min
child 60 ±10 mmHg / 2 min
infant 40 ±10 mmHg / 1 min
Cuff widths Please see User’s Guide

1.3 Technical specifications

Deflation rate, HR dep. 5...13 mmHg/sec
Inflation rate, typical 20...185 mmHg, 1...5 s

Automatic software control, max. inflation pressure

adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 150 ±10 mmHg
Over pressure limit, stops measurement after 2 seconds
adult 320 mmHg
child 220 mmHg
infant 165 mmHg
A safety valve limits the maximum cuff pressure to 320 mmHg in adult/child mode or 165 mmHg
in infant mode. An independent timing circuit limits pressurizing (>15 mmHg) time to 2 minutes 10
seconds maximum in adult/child mode, and 1 minute 5 seconds in infant mode.
Zeroing to ambient pressure is done automatically.

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Inflation pressure is adjusted according to the previous systolic pressure, typically 40 mmHg
above. If the systolic pressure is not found, inflation pressure is increased typically 50 mmHg.
Max. measurement time adult 2 min.
child 2 min.
infant 1 min.
Pressure transducer accuracy is better than ±3 mmHg or ±2 % (whichever is greater). Max. error ±4
mmHg.
Protection against electrical shock Type BF defibrillation proof

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure.
The NIBP measurement is performed according to the oscillometric measuring principle. The cuff is
inflated with a pressure slightly higher than the presumed systolic pressure, and deflated at a
speed based on the patient’s pulse, collecting data from the oscillations caused by the pulsating
artery. Based on these oscillations, values for systolic, mean, and diastolic pressures are
calculated.
The following parts are necessary for NIBP measurement:
• NIBP module
• Twin hose (adult or infant model)
• Blood pressure cuffs (different sizes)

2.2 Main components

The NIBP module consists the following parts:
• NIBP board
• Pneumatics and hosing
• NIBP air pump
• Zero valve
• Check valve
• Bleed valve
• Exhaust valves (2)
• Pressure transducers (2)
• Module keyboard and status indicator LEDs
• Front panel keys: Auto On/Off, Set Cycle Time, Stat On/Off, Start/Cancel

Auto
On/Off

Auto
Set
Manual Cycle
STAT Time
Measuring
STAT
On/Off
NIBP

Start
Cancel

Figure 2 Front panel of NIBP Module

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2.2.1 NIBP board

Exhaust valve 1

Cuff
Bleed valve
Zero Exhaust Pump
Joining chamber
valve valve 2 and
Check valve Pump valve
M
driver

B1 B2 Pressure
Overpressure control
transducers
Watchdog
timer

AD- +15 VD
converter
Address bus
CPU
80C51FA
Power-up
reset
Address
decoder

NESTPR_NIBP_board_blck_dgrm.vsd
RS485
to/from module bus

interf.
Front Software
Address RAM EPROM panel
X1 control
Internal latch keys
EEPROM watchdog
(calibration
data)
Databus
Write protection switch

Figure 3 NIBP board functional block diagram

Pressure transducers
The NIBP board contains two piezoresistive type pressure transducers. One is used for measuring
the pressure of the blood pressure cuff and the pressure fluctuations caused by arterial wall
movement (B1). The other is used for detection of cuff hose type, cuff loose and cuff occlusion
situations etc. (B2). The transducers are internally temperature compensated. They are supplied by
a constant voltage and their output voltage changes up to 40 mV max. (50 kPa, 375 mmHg).

Signal processing
Two signals from the pressure transducers are amplified and sent to A/D converter. Before the
converter, one of the signals is used to adjust the offset of the pressure safety level. After the
converter, digitized signals are sent to the microprocessor for data processing.
The NIBP board is controlled with 80C51FA microprocessor at 16 MHz oscillator frequency.
Communication between the module and the monitor CPU board is established via an RS485
serial interface at 500 kbps data transfer rate.

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Memory
NIBP program memory (EPROM) size is 128k × 8. RAM size is 32k × 8 bit and it stores variable
values in NIBP measurement. EEPROM is size 64 × 16 bit and is used to store the calibration
values for the pressure transducers, the pulse valve constants gained during measurements, the
PC board identification, and module serial number.

Software control
Software controls the valves and pump. In addition to the individual on/off signals for each
component there is a common power switch for the valves and the pump that can be used during
pump/valve failures.
In addition to an external RS485 reset line the microprocessor system is equipped with its own
power-up reset.

Watchdog timer
The NIBP board is equipped with software independent safety circuit to disconnect supply voltages
from the pump and the valves if the cuff has been pressurized longer than the preset time. As soon
as the cuff pressure rises over a specified pressure limit, the timer starts counting. The timer is
adjusted to stop the pump and open the valves in 2 minutes 10 seconds in adult/child mode and
in 1 minute 5 seconds in infant mode.

Valves
Exhaust valves are used for emptying the cuff and the joining chamber after the measurement.
Exhaust valve 1 is also used as a safety valve in infant mode. The valve opens at 165 mmHg.
Exhaust valve 2 is also used as a safety valve in adult mode and opens at 320 mmHg.
The bleed valve is used for emptying the cuff during the measurement. The zero valve is used for
connecting the pressure transducer B1 to open air.

Power supply section

All connections are established via a 25-pin connector (D-type, female). The module needs +5 V,
±15 V, and +15 VD (dirty) power supply to operate. The pump and the valves use a separate +15
VD power line. The supply voltages are generated in the power supply section of the S/5 monitor.
The reference voltages ±5 Vref and +10 Vref are generated on the NIBP board.

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Module Bus connector (X1)

Pin No I/O Signal Not used

1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 - Ground & Shield
8 I -RESET_RS485
9 I CTSB *
10 O RTSB *
11 I RXDB *
12 O TXDB *
13 - Ground & Shield
14 I +32 VDIRTY *
15 I GroundDIRTY
16 I CTSC *
17 O RTSC *
18 I RXDC *
19 O TXDC *
20 - ON/STANDBY *
21 - PWM_ECG *
22 - RXDD_RS232 *
23 - TXDD_RS232 *
24 I +5 VDC
25 I +5 VDC
*Not used in the M-NIBP module

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2.3.2 Test points

NIBP board
There are test pad blocks on solder side.
X8 and X6 pads and voltages are:

Pump
X6
X6 2 1
X3 10 2
X5 9 1
X8 X8
X7 8 7

X8 X6
Pin No Signal Pin No Signal
1 GND 1 GND
2 WD out 2 A1 output
3 reset 3 -5V
4 +5 V 4 +5 V ref
5 +15 V dirty 5 B1 out - (A1 input)
6 +15 V 6 B1 out +
7 -15 V 7 B2 out +
8 - 8 B2 out -
9 -
10 GND

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-NIBP module is limited to replacing faulty circuit boards or mechanical parts.
The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with the appropriate tools and equipment should perform
the tests and repairs outlined in this section. Unauthorized service may void
warranty of the unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Pressure manometer
Adult cuff & hose
Infant cuff & hose
Screwdriver

3.2.2 Recommended parts

Part Order No. Notes
NIBP pump filter 57142

• Detach the module box by removing the two screws from the back of the module. Be careful
with loose latch and spring pin for locking.

1. Check internal parts:

− screws are tightened properly
− cables are connected properly
− all IC’s that are on sockets are attached properly
− EMC covers are attached properly
− the calibration protection switch on the NIBP board is intact
− tubes are not pinched and there are no sharp bends on them

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− tubes are connected properly

− the upper of the cuff connector tubes, as well as the related tube connector are
marked
− there are no loose objects inside the module

?
2. Check external parts:
− the front cover and the front panel sticker are intact
− the cuff connector is intact and is attached properly
− the module box, the latch and the spring pin are intact

?
3. Replace the NIBP pump filter, if necessary.

?
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until the monitoring screen appears.
• Make sure that NIBP information is selected to be shown on the screen:

Monitor Setup - Screen 1 Setup - Digit Fields - Field 2 - NIBP

4. Plug in the module. Check that it goes in smoothly and locks up properly

?
5. Check that the module is recognized, i.e. the NIBP headers appear on the selected digit
field.

?
6. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding NIBP module software by selecting Scroll Vers and
turning the ComWheel.

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7. Enter the NIBP module service menu:

Parameters - NIBP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the NIBP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.

?
8. Check the front panel LEDs and membrane keys.

Select Buttons/Leds

Highlight the text Auto ON. Check that the LED for the autocycle measurement is turning on
and off on the module front panel when pressing the ComWheel. Check also the other LEDs
by selecting Manual ON, STAT ON and Measur. ON.

Press each of the module’s membrane keys at least for one second. Check that the pressed
key is identified, i.e. the text OFF changes to ON for the key in the menu.

?
9. Check the pump and valves.

Select Pneumatics from the NIBP menu. Connect a pressure manometer to the NIBP
module cuff connector.

Highlight Start Pump and press the ComWheel. Check that the pump turns on and the
pressure inside the tubing system starts to increase. Stop the pump by pressing the
ComWheel again when the pressure reaches 280 mmHg.

Highlight Open Exh1. Press the ComWeel and check that the pressure inside the tubing
system starts to drop then press the ComWheel again. Check the other exhaust valve by the
same way by selecting Open Exh2 from the menu.

If necessary, turn the pump on again for a moment to increase the pressure inside the
tubing system.

Highlight Open Zerovalve. Press the ComWheel and check that the pressure B1 ≅ 0 mmHg.
Close the zero valve by pressing the ComWheel again and check that the pressure B1 is
equal with the pressure B2.

Highlight Set Valve. Press the ComWheel and set the value under the text ‘Pulse Valve’ to
number 150 by turning the ComWheel. Press the ComWheel again and check that the
pressure inside the tubing system starts to drop. Finish the test by selecting Previous Menu.

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10. Check the NIBP tubing system for leakages.

Select Calibrations from the NIBP service menu.

Keep the pressure manometer connected to the NIBP module cuff connector. Start the
active leak test from the menu by pressing the ComWheel. The module pumps a pressure of
about 265 mmHg and then the pump stops.
Wait for 15 seconds for the pressure to stabilize then check that the pressure does not drop
more than 6 mmHg per one minute. Release the pressure by pressing the ComWheel once
more.

?
11. Calibration check.

Recalibrate the NIBP measurement. Remember to set the calibration protection back on
after the calibration.

Disconnect the pressure manometer. Select Calibrations and then highlight Calibration
Check. Press the ComWheel and take down the zero offset values for both pressure
transducers, B1 and B2. The values should be within ±10 mmHg.

Connect the pressure manometer to the cuff connector and check the calibration with
pressures 100 mmHg, 200 mmHg and 260 mmHg. The zero offset value must be added to
the displayed pressure value in order to determine the real pressure.

?
12. Check the watchdog timer activation pressure.

Select Pneumatics from the NIBP service menu.

Keep the pressure manometer connected to the cuff connector. Pump up the pressure very
slowly and note the value on the manometer when your hear a signal from the loudspeaker.
The pressure at where the watchdog timer should activate with an audible signal is

13 mmHg (11...15 mmHg)

Adjust the limit with the trimmer on the NIBP board, if necessary.

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13. Check the watchdog timer.

Select Watchdog from the NIBP service menu.

Check the watchdog timer in the adult mode. Activate the timer by highlighting Test ADULT
and then pressing the ComWheel. Check that the time beside the text ‘Watchdog Interval’
starts to run. Wait until you hear a signal from the loudspeaker and then check the time
again. The time from the adult test should fall within 120...140 seconds.
Check the watchdog timer also in the infant mode by first selecting Test INFANT from the
menu. The time from the infant test should fall within 60...70 seconds.

?
14. Check the safety valve.

Select Safety Valve from the NIBP service menu.

Keep the pressure manometer connected to the cuff connector.

NOTE: Make sure your pressure manometer can be used to measure pressures over 300
mmHg. If such a pressure manometer is not available, perform the check with an adult cuff
that is connected around some round object, for example calibration gas bottle.

Highlight Start Test. Start the adult safety valve test by pressing the ComWheel. Wait until
the pump stops and the pressure is deflated. Check the pressure values ‘Max press’ and ‘2
s after stop’ for both transducers. All the values should be within 290...330 mmHg.

Highlight Adult. Press the ComWheel and check that the text changes now to Infant. Select
Start Test and wait until the pump stops and the pressure values on the screen have been
updated. Check that the values ‘Max press’ and ‘2 s after stop’ are all now within
154...165 mmHg.

Return to the normal monitoring mode by pressing Normal Screen.

?
15. Connect an adult NIBP cuff to the cuff connector and disconnect one of its hoses.
Start NIBP measurement by pressing the key Start/Cancel on the module and check that
the message ‘Cuff loose’ appears on the screen within 30 seconds.

Reconnect the hose and then bend it with your fingers. Restart the measurement and check
that the message ‘Cuff occlusion’ appears on the screen within 30 seconds.

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16. Check that automatic inflation limits are in use:

NIBP - NIBP Setup - Inflation Limits - Auto - Previous Menu

Connect the cuff onto your arm, highlight Start Ven.Stasis in the NIBP menu and press the
ComWheel. Check the module identifies the cuff, i.e. the text ‘Adult’ appears into the NIBP
digit field for a short moment.

Keep the pressure inside the cuff for about half a minute in order to see that the cuff is not
leaking, then press the ComWheel again. Select Normal Screen.

?
17. Keep the cuff on your arm and perform one NIBP measurement. Check that the module
gives a reasonable measuring result.

?
18. Connect an infant cuff to cuff connector and wrap it around your fingers.
Start NIBP measurement and check that the module identifies the cuff, i.e. the text ‘Infant’
appears into the NIBP digit field. Cancel the measurement after the cuff identification.

?
19. Perform electrical safety check and leakage current test.

?
20. Check that the module functions normally after the performed electrical safety check.

?
21. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

Rev. 01-03 Disassemble the M-NIBP module in the following way. See the exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with loose
latch and spring pin for locking.
3. To detach the NIBP board remove the four corner screws from the back of NIBP board. The
NIBP board and the front panel can be detached.
4. To free the front panel and the NIBP board, disconnect tubes and connectors.
5. Remove the five screws and lift off the plastic pump cover. NIBP pump, safety (over
pressure) valve, and valve unit which includes two valves, wires and a connector will be
exposed. Remove them.
6. Pull out pulse valve from the bottom of the NIBP frame.

Rev. 04 -> Disassemble the M-NIBP module in the following way. See the exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with loose
latch and spring pin for locking.
3. To detach the NIBP board remove the support plate by 2 screws (item 25).
4. Remove the metal frame (item 26).
5. Detach the damping chamber with 3 screws.
6. Detach 2 screws (item 9).
7. To free the front panel and the NIBP board, disconnect tubes and connectors.
8. Remove the two screws and lift off the pump. NIBP pump, and valve unit which includes four
valves, wires and a connector will be exposed. Remove them.

CAUTION Before reattaching the module box, make sure that the tubes are not pinched
between the NIBP frame and the PC board.
NOTE: Take care that the connectors and especially the tubes are reconnected properly and to the
correct ports.

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3.4 Adjustments and calibrations

3.4.1 Pressure safety level detection “OFFSET”

Remove two screws at the rear of the module. Remove the module box. Connect first the service
cable (e.g. a long Gas interface cable) to the module connector inside the monitor frame and then
to the rear connector of the module. Switch the monitor on. Go to the NIBP service menu and select
Pneumatics. Pump reference pressure into the module:
13 mmHg (11...15 mmHg)
Adjust the trimmer until AD5 signal sign changes from negative to positive. Re-check the
adjustement, then lock the trimmer with for example nail polish.

3.4.2 NIBP calibrations

The electronics of the NIBP pressure measurement is calibrated at the factory. Zeroing pressure is
automatically maintained by the processor. If the zero point of the pressure transducer drifts more
than specified, an error message is given and the NIBP board should be recalibrated or replaced.
The calibration can be checked and recalibrated in the NIBP service menu.
The calibration of the primary pressure channel can also be checked from the NIBP setup menu
(NIBP, NIBP Setup, Calibration Check). In this case the auto zeroing is performed at start - remove
hose before entering to ensure atmospheric pressure to the pressure transducers - the primary
pressure is displayed. The zero-offset value should then be zero.

Calibration check
1. Enter Calibration menu.

2. Select ‘Calibration Check’ and press the ComWheel.

3. Connect an external precision manometer to the module.

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4. Pump the following pressures to manometer and check the difference between the
manometer and monitor pressure display:

Pressure Max. error Example

0 mmHg ±9 mmHg (=zero offset) -2
100 mmHg 100 + zero offset ±2 mmHg 98 ±2
200 mmHg 200 + zero offset ±3 mmHg 198 ±2
I
f the error of pressure channel B1 is larger than specified above, the module should be
recalibrated. The error of B2 is allowed to be even twice as large because it has no effect on blood
pressure measurement accuracy. However, we recommend recalibrating the module also when the
error of B2 is larger than specified above to ensure best possible operation.

Calibration
1. Enter Calibration menu.
2. Remove hoses from front panel connector to enable proper zeroing.
3. Select Calibration. If it is not available, perform the steps A, B and C.

NOTE: Do not pull out the NIBP module from the monitor frame. The module must be in the frame
during the entire procedure.

A) Turn the toggle switch at the bottom of the NIBP module to enable the calibration.
Turn the switch to the right by, for example, a sharp pencil. This enables menu
selection ‘Protection’. the message ‘Calibration switch ON!’ appears.
B) Select Protection OFF in the Calibration menu and press the ComWheel.
C) Return the toggle switch to the left. Menu selection Calibration is now enabled, and
Protection is disabled. When the calibration is enabled, a message ‘Calibration not
protected’ appears.

4. Start Calibration by pressing the ComWheel. Messages ‘ZEROING’ and ‘ZEROED’ will appear
in the NIBP message field. After this a pressure bar will appear.
5. Connect an external mercury manometer with pump to module through the both tubes of
the hose - both transducers B1 and B2 must be calibrated simultaneously. Pump up to a
pressure about 200 mmHg according to the manometer. Calibration is possible in the range
150 to 300 mmHg.
6. Verify that both pressure values in the prompt field match the manometer reading. If not,
adjust by turning the ComWheel. When the values of the pressure bar and the manometer
are equal, press the ComWheel to confirm the calibration. The message ‘Calibrating’ will
appear onto the NIBP digit field. After a few seconds it is followed by ‘Calibrated’, which
means that the calibration has succeeded, and the new calibration data has been saved
into EEPROM.

NOTE! When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct (i.e. change the value for
example one step higher and then back one step lower). “Calibrated” text should appear in

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the display. This ensures that the calibration procedure is correctly registered and stored by
the module.
To set the protection on:
Turn the toggle switch to the right. Select Protection ON and press the ComWheel. Then turn
the toggle switch back to the left.

7. Remove the module from the frame and plug it back again. Then perform Calibration Check
(see the preceding page) to verify the new calibration.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Cause Treatment
No NIBP value displayed NIBP not selected on screen. Check monitor setup.
NIBP menu fading No M-NIBP module, module not properly connected, Plug in the module.
or NIBP and NE(12)STPR/MRI module connected at
the same time.
Artifacts-message Unsuccessful measurement due to patient
movements or shivering.
Weak pulsation-message Weak or unstable oscillation pulses due to: Check patient condition and retry.
− artifacts (accurate diastolic pressure difficult to Check any leaks and retry.
measure) Use proper size of cuff. Check attachment.
− marked arrhythmia
− marked drop in diastolic pressure
− diastolic pressure difficult to measure
− improper cuff position or attachment
− too few pulses detected
− weak or unusual blood circulation
− may give systolic value

Call service NIBP hardware error. See the description of the error message code, the
Error X-message X = error number. causes and the solutions listed in the next chapter.
‘Cuff loose’ message 1. Hose and/or cuff not connected. 1. Connect the hose and the cuff.

2. Hose and cuff connected. 2.

Reason: − tighten the cuff
− cuff loosely wrapped − replace cuff/hose
− leakage in cuff or hose − check internal tubing and air chamber, and fix if
− leakage inside module necessary

− pump does not work − check pump connector; if OK, replace pump

− no pulses during the last three measurements − check cuff positioning

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Trouble Cause Treatment

‘Air leakage’ message 1. Hose or cuff leaking. 1. Replace cuff
Reason: − replace cuff connector (if the fault is in hose
− cuff damaged connector, replace hose)

− cuff connector damaged − replace O-ring

− O-ring damaged or missing

− hose double connector damaged
2. Hose and cuff OK. 2. Connect or replace tube
Reason: − replace the whole tubing
− leakage inside the module − fix connections
− tube disconnected or damaged − replace valve(s)
− air chamber leaking
− tubes or valve(s) damaged

‘Unable to measure Sys’ Systolic blood pressure probably higher than the Automatic retrial with increased pressure.
message maximum inflation pressure.
‘Cuff occlusion’ message 1. Cuff and/or hose occluded. 1.
Reason: − straighten tube
− cuff tube kinked − remove occlusion
− tube inside module kinked
− occlusion inside/outside module

2. Cuff, hose, and tubes OK. 2.

Reason:
− replace the NIBP board
− fault in pressure transducer
− check calibration
− fault in A/D converter
− recalibrate
− faulty calibration
− missing voltages

‘Calibration switch on’ EEPROM protection switch at the bottom of the module Enables setting the protection OFF in the Calibration
message is turned to right. menu. Turn switch to left if you are not going to
calibrate.
‘Calibration not protected’ Calibration protection is set to OFF. Set the protection ON in the NIBP Calibration menu.
message.

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4.2 NIBP error code explanation

Code Explanation
0 RAM failure
Memory failure. Change NIBP board.
1 ROM checksum error
Memory failure. Change NIBP board.
2 +15V failure
Check short circuits. Change NIBP board.
3 -15V failure
Check short circuits. Change NIBP board.
4 EEPROM protection switch error. (only with S-STD93)
Turn the toggle switch to the left at the bottom of the module.
5 Calibration not protected. (only with S-STD93)
Protect calibration by selecting Protection ON in the NIBP calibration menu
6 ADC error
ADC circuit failure. Change NIBP board.
7 Watchdog time too short
Change NIBP board.
8 Watchdog time too long
Change NIBP board.
9 Watchdog activated
Change NIBP board.
10 EEPROM checksum error
Memory failure. Change NIBP board.
11 Auto zero range exceeded
Calibrate NIBP.
12 Communication break
Temporal break down of communication from monitor detected. Automatic
recovery.
14 Too early Auto Start (needs 25 seconds without pressure).

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4.3 Troubleshooting flowchart

START Possible fault in

NIBP module.

Insert NIBP Remove all Replace NIBP

module and turn modules from module.
power on. C.Monitor Frame.
NO

Does
Fault not in NIBP
the fault still NO OK?
module.
appear?

YES

Does
Module ID on another module Check and replace Check and replace
NO work in the YES
screen? NIBP board. NIBP board.
same slot?

NO
YES

Error LED
check in Replace LED
message on NO Service Menu NO OK?
board.
screen? OK?

YES
YES

See error code Key Check keyboard

explanation in check in
Service Manual Service Menu NO connector. If OK,
and fix it. OK? change front panel.

YES

Do they work?
Pump Check pump
check in
Service Menu NO connector. If OK,
OK? change pump.
NO

Check tubes and

connectors. Find YES
leak and fix it.

Leak test
NO in Service YES
Menu OK?

Figure 4 NIBP Module troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters - NIBP.

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5.1 NIBP Service menu

Service Data Pressure shows measured pressure multiplied by 10.

Zero shows pressure at auto zeroing multiplied by 10 and changes between +20 and -20 mmHg.
Absolute pressure is the sum of Pressure and Zero.
Protect handle indicates hardware protection for EEPROM memory. It should be ON all the time in
normal operation. If it is OFF data can not be read from or written to EEPROM, only the calibration
protection can be set or reset by software. It can be turned to OFF by turning the toggle switch to the
right at the bottom of the module, which also enables 'Protection ON/OFF' menu selection in the
calibration menu.
Calibr. prot. shows software calibration protection and should be OFF to enable calibration.

+15 V power indicates the condition of the supply voltage +15 Vdirty for the pump and valves. It
exists (ON) or not (OFF) depending on service menu function. The supply voltage can be turned on
by selecting the previous menu and then the desired menu again.

AD0 to AD7 show the values of each eight channels of A/D converter.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum in the EPROM is in accordance with the one the software has
calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.1.1 NIBP Demo menu

A service menu for demonstarting the oscillometric method of NIBP measurement. The menu
shows the realtime pressure signals that are measured from the NIBP cuff. The measurement result
is shown in the adjoining digit field.
Wave Recording Wave Recording is for selecting the recording option. If ON is selected, the pressure signals are
recorded in realtime onto the M-REC paper.
Remove menu Remove menu widens the displayed waveform area.
Previous Menu The menu can be closed by selecting the Previous Menu or just by pressing the ComWheel if the
Remove menu was selected.

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5.1.2 NIBP Calibration menu

Active Leak Test Wrap an adult cuff around a pipe and connect the cuff to the module. Select the active leak test
(ON). The module automatically pumps a pressure of 260 mmHg into the cuff. Wait for several
seconds until the pressure stabilizes. Then check that the pressure reading does not drop more
than 6 mmHg per minute. If it does, leaking point(s) should be detected and fixed. Cancel the test
by selecting Active leak test OFF.
Calibration Check
Calibrate the NIBP measurement once a year. The checking and recalibrating can be done in the
NIBP service menu.
Check the intake air filter as part of the calibration check. Change the filter if it is visibly dirty.
After the calibration check is selected (ON), manually pump pressure into the module and make
sure that the same pressure values are shown both on the display and on manometer. Pressure of
both pressure channels B1 and B2 are shown. Note that if the display shows +2 mmHg at zero
pressure and if you pumped +200 mmHg into the module, the display should show +202 mmHg.
Protection Software calibration protection (ON/OFF). Select OFF when calibrating. Protection can be set to ON
or OFF only when the toggle switch at the bottom of the module is set to the right.
Calibration Calibration selection is available only when protection is OFF.
NIBP calibration can be performed in the NIBP Service menu as follows:
NOTE: Both channels B1 and B2 must be calibrated simultaneously.
1. If Protection is ON change it to OFF by first turning the toggle switch to the right at the bottom
of the module, which enables the Protection selection. Then turn the toggle switch to the left
to enable Calibration.
NOTE : Do not disconnect the module from the frame when turning the switch. The module must be
in the frame during the whole procedure.
NOTE: When the switch is at the right, the NIBP field shows an error message ‘Calibration switch on!’.
NOTE: When calibration is enabled, a message ‘Calibration not protected’ appears.
2. For proper zeroing to take place, remove the hose from the front panel connector. Select

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Calibration and press the ComWheel. Messages ‘ZEROING’ and ‘ZEROED’ will appear in the
NIBP message field. After this a pressure bar will appear beside the menu.
3. Connect an external mercury manometer with pump to module through the both tubes of
the hose. Pump up to about 200 mmHg pressure (range of 150 to 300 mmHg allowed)
according to the manometer. Verify that both pressure values in the prompt field match the
manometer reading. If not, adjust by turning the ComWheel.
4. When the values are equal, press the ComWheel to confirm the calibration. First the
message ‘Calibrating’ will appear in the digit field for NIBP followed after a few seconds
‘Calibrated’, which means that the calibration data has now been saved.

NOTE! When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct (i.e. change the value for
example one step higher and then back one step lower). “Calibrated” text should appear in
the display. This ensures that the calibration procedure is correctly registered and stored by
the module.
5. Use the bottom switch to enable Protection setting and set it ON, and finally disable
Protection setting.

5.1.3 NIBP Safety Valve menu

Start Test Start test is for starting and Stop test is for stopping the Safety Valve test.
NOTE: Parameter values in Service Data are for reference only.

Safety Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Max. press and 2 s after stop show the measured values at Safety Valve test.
Safety Valve Test Adult/Infant
Wrap an adult cuff around a pipe and connect the cuff to the module. Highlight Start test and give
the ComWheel a press. The test ends automatically or when Stop test (appears in place of Start

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test) is pressed.
Max. press indicates the pressure at which the safety valve opens and is normally 310 ±15 mmHg
for adult and 150 mmHg ±15 mmHg for infant. 2 s after stop indicates the pressure at 2 seconds
after the pump has stopped and is normally > 280 mmHg for adult and > 120 mmHg for infant. If
the value is less, check leakage by the active leak test.

5.1.4 NIBP Pulse Valve menu

NOTE: Parameter values in Service Data are for reference only.

Start Test Start test is for starting and Stop test is for stopping the test.
Set Valve Set Valve lets you adjust the opening of the pulse valve.

Pulse Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Pulse Valve Checking
Wrap an adult cuff around a pipe and connect the cuff to the module. Select the Start test and
press the ComWheel. The pressure rises beyond 240 mmHg and stops. The pulse valve opens. The
module counts the time it takes for the pressure to go down from 240 mmHg to 50 mmHg and
displays it on the screen. The test can be manually stopped by selecting Stop test.
The valve can be adjusted between 0 and 255 (0 for fully closed and 255 for fully open). First
select Set Valve and press the ComWheel. See the pulse valve value and adjust it by turning the
ComWheel. Then press the ComWheel to confirm the value.
The ‘Interval 240 mmHg -> 50 mmHg’ time should be less than 60 seconds when the valve is
'150' and less than 10 when fully opened (255). When fully closed (0), the system should be
airtight and the pressure does not drop. Depending on an individual, the pulse valve may remain
closed up to approx. value 45.
If the measured time deviates much from those above, then the pulse valve or its tubes are faulty.

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5.1.5 NIBP Buttons/Leds menu

NOTE: Parameter values in Service Data are for reference only.

The front panel LEDs can be turned manually ON and OFF by selecting Auto ON/OFF, Manual
ON/OFF, STAT ON/OFF, and Measur. ON/OFF from the menu.

Buttons/Leds Data
See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Buttons Checking
The front panel keys function is confirmed by pressing the key and observing OFF turns to ON at the
corresponding text in the menu.

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5.1.6 NIBP Pneumatics menu

NOTE: Parameter values in Service Data are for reference only.

Start Pump/Stop Pump
A manual control for the pump. The selection changes to Stop Pump when the pump turns on.
Open Exh1/Close Exh1
A manual control for the exhaust valve 1. The selection changes to Close Exh1 when the valve is
opened.
Open Exh2/Close Exh2
A manual control for the exhaust valve 2. The selection changes to Close Exh2 when the valve is
opened.
Open Zerovalve/Close Zerovalve
A manual control for the zero valve. The selection changes to Close Zerovalve when the valve is
opened.
Set Valve With Set Valve, the opening of the pulse valve is adjusted between 0 and 255 (0 for fully closed
and 255 for fully open). First press the ComWheel, then turn it to adjust the value on screen and
finally press to set the value.
Reset Clock Reset Clock will zero the time on the display.
Pneumatics Data
See NIBP service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Pump, Exh1 Valve, and Exh2 Valve show their states.
Pulse Valve shows how much the valve is opened (0 to 255) during Valve Setting.
Interval 20 mmHg -> 185 mmHg Checking
Select the Start pump at different combinations of the valves open/closed and press the
ComWheel. The module counts the time it takes for the pressure to go up from 20 mmHg to 185
mmHg and displays it. When all the valves are closed, the pump should be able to pump the
pressure in about 1 to 4 seconds into an adult cuff wrapped around a pipe. The pump does not
stop without selecting the Stop Pump by pressing the ComWheel.

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Watchdog BEEP
Connect manometer to the front panel and pump pressure into the module. When the AD5 value
changes from negative to positive value (at about 5 mmHg) a beep is heard. This is the watchdog
threshold pressure. Beyond this pressure the watchdog is active and cut pressures at about 2 min.
(adult).

5.1.7 NIBP Watchdog menu

NOTE: Parameter values in Service Data are for reference only.

Test ADULT Test ADULT is to test watchdog timer in adult mode (120 to 140 seconds).
Test INFANT Test INFANT is to test watchdog timer in infant mode (about 60 to 70 seconds).
Stop Test Stop Test is for stopping the test.
Watchdog Data
See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Watchdog Interval shows the time the +15 Vdirty stays on during the test.
Adult watchdog time testing
Select Test ADULT and press the ComWheel. Watchdog interval starts counting up seconds and
keeps on counting as long as the +15 Vdirty is on. The time should be 120 to 140 seconds.
Infant watchdog time testing
Select Test INFANT and press the ComWheel. Watchdog interval starts counting up seconds and
keeps on counting as long as the +15 Vdirty is on. The time should be 60 to 70 seconds.

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6 SPARE PARTS

6.1 NIBP Module box

Figure 5 Exploded view of the M-NIBP module box

Item Description Order No. Replaced by

1 Module box (wide) 886168
2 Latch for module box 879181
3 Spring pin 879182
4 Cross reces screw 3 x 10 628706
5 Front mask unit, M-NIBP (includes all the connector and input boards) 881335

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Figure 6 Exploded view of the M-NIBP module, rev. 00-03

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6.2 NIBP Module Rev. 00-03

Item Description Order No. Replaced by
7 Software GAL for NIBP board 880864
8 NIBP board, M-NIBP (rev.01) 880359 883011
8 NIBP board (rev.02) 882418 883011
8 NIBP board, M-NIBP (rev.03) 883011
9 Cross cylinder head PT screw M3x20 628709
10 Cross cylinder-head PT screw M3x10 628703
11 NIBP frame, M-NIBP (rev.01-03) 880427
12 Software GAL for NIBP board 879866
13 NIBP Safety valve 877109
14 NIBP pump, M-NIBP (rev.01-02) 880363 883346
14 NIBP pump, M-NIBP (rev.03) 883346
15 Plastic pump cover, M-NIBP 879176
16 Front Panel sticker, DA ; M-NIBP (rev.00-04) 892215 898609
16 Front Panel sticker, DA ; M-NIBP (rev.05) ; S/5 898609
16 Front Panel sticker, DE ; M-NIBP (rev.00-04) 880476 898600
16 Front Panel sticker, DE ; M-NIBP (rev.05) ; S/5 898600
16 Front panel sticker, EN ; M-NIBP (rev.00-04) 879482 898599
16 Front Panel sticker, EN ; M-NIBP (rev.05) ; S/5 898599
16 Front Panel sticker, ES ; M-NIBP (rev.00-04) 884386 898603
16 Front Panel sticker, ES ; M-NIBP (rev.05) ; S/5 898603
16 Front Panel sticker, FI ; M-NIBP (rev.00-04) 888872 898606
16 Front Panel sticker, FI ; M-NIBP (rev.05) ; S/5 898606
16 Front Panel sticker, FR ; M-NIBP (rev.00-04) 880159 898601
16 Front Panel sticker, FR ; M-NIBP (rev.05) ; S/5 898601
16 Front Panel sticker, IT ; M-NIBP (rev.00-04) 886752 898604
16 Front Panel sticker, IT ; M-NIBP (rev.05) ; S/5 898604
16 Front Panel sticker, JA ; M-NIBP (rev.00-04) 888316 898610
16 Front Panel sticker, JA ; M-NIBP (rev.05) ; S/5 898610
16 Front Panel sticker, NL ; M-NIBP (rev.00-04) 886124 898602
16 Front Panel sticker, NL ; M-NIBP (rev.05) ; S/5 898602
16 Front Panel sticker, NO ; M-NIBP (rev.00-04) 893559 898608
16 Front Panel sticker, NO ; M-NIBP (rev.05) ; S/5 898608
16 Front Panel sticker, PT ; M-NIBP (rev.00-04) 895254 898605
16 Front Panel sticker, PT ; M-NIBP (rev.05) ; S/5 898605
16 Front Panel sticker,SV ; M-NIBP (rev.00-04) 885870 898607
16 Front Panel sticker, SV ; M-NIBP (rev.05) ; S/5 898607
17 Led board, M-NIBP (rev.01-03) 880361
18 NIBP Cuff connector 64654
19 Cross cylinder-head scerw M3x12 628700
20 Port plug for 58534 58535
21 Magnetic valve, without port plug 58534
22 Pulse valve (rev.03) 880365
23 Check valve 58542
NOTE: The NIBP board 883011 replaces NIBP boards 880359 and 882418 only if used together
with NIBP software 883902

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6.3 NIBP Module Rev. 04

Figure 7 Exploded view of the M-NIBP module, rev.04

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Item Description Order No Replaced by

1 Module box (wide) 886168
2 Spring pin 879182
3 Latch for module box 879181
4 Cross recess screw M3x8 black 616215
5 Front mask unit, M-NIBP (includes all the connector and input boards) 881335
8 NIBP board, M-NIBP (rev. 04) 894368
NIBP board software (*) 888237
9 Screw STZN 3.5x9.5 DIN 7981 62539
10 Cross cylinder-head screw M3x6 61721
14 NIPB pump, M-NESTPR, M-NIBP (rev.04) 889993
17 Led board, M-NIBP (rev.04) 893882
18 NIBP Cuff connector 64654
21 Magnetic valve 58562
23 Check valve 58542
24 EMC cover 888236
25 Support plate 893881
26 Metal frame 888230
27 Flat cable; LED 894118
28 Air filter (NIBP) 57142
29 Damping chamber, M-NESTPR, M-NIBP (rev.04) 888240
30 Bleed valve, M-NESTPR, M-NIBP (rev.04) 58566
31 Spring 892676
32 Membrane keypad 879374

(*) NOTE! Do not install the NIBP board software 888237 into the NIBP modules M-NIBP rev. 00-03.

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7 EARLIER REVISIONS
For service information on the earlier revisions, please refer to:
NIBP Module revision 01 Service Manual p/n 880850
NIBP Module revision 02 Service Manual p/n 882580
NIBP Module revision 03 Technical Reference Manual p/n 892953

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APPENDIX A, NIBP Module, M-NIBP

APPENDIX A

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 APPENDIX A, Service check form, NIBP Module, M-NIBP

SERVICE CHECK FORM

Non-Invasive Blood Pressure Module, M-NIBP

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Pump’s filter 4. Installation

Notes

5. Recognition

6. Module software NIBP

7. Communication and 8. LEDs and membrane
memories keys
9. Pump and valves

10. Leak test ≤ 6 mmHg/min

11. Calibration check
Measured B1 Measured B2 Allowed range
0 mmHg ±10 mmHg
100 mmHg 100 + z.o. ±2 mmHg
200 mmHg 200 + z.o. ±3 mmHg
260 mmHg 260 + z.o. ±4 mmHg
z.o. = zero offset at 0 mmHg pressure

12. Watchdog timer activation pressure 11…15 mmHg

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13. Watchdog timer

Allowed range
Adult 120...140 s
Infant 60...70 s
14. Safety valve B1 B2 Allowed range
‘Max press’ ADULT 290...330 mmHg
‘2 s after stop’ ADULT 290...330 mmHg
‘Max press’ INFANT 154...165 mmHg
‘2 s after stop’ INFANT 154...165 mmHg

OK N.A. Fail OK N.A. Fail

15. Cuff related messages 16. Adult cuff detection

17. Test measurement 18. Infant cuff detection

Notes

19. Electrical safety check 20. Functioning after

electrical safety
check
21. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A-2(2)
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 Datex-Ohmeda
S/5TM Recorder Module, M-REC (Rev. 03)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8001016-3

January 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Recorder Module, M-REC
TABLE OF CONTENTS i
TABLE OF FIGURES i
Introduction 3
1 Specifications 5
2 Functional Description 7
2.1 Main components.....................................................................................................................................7
2.1.1 Recorder board ................................................................................................................................7
2.2 Module bus connector ..............................................................................................................................8
3 Service Procedures 9
3.1 General service information.......................................................................................................................9
3.2 Service check ...........................................................................................................................................9
3.2.1 Recommended tools ........................................................................................................................9
3.2.2 Recommended parts ........................................................................................................................9
3.3 Disassembly and reassembly..................................................................................................................12
4 Troubleshooting 13
4.1 Troubleshooting chart .............................................................................................................................13
4.2 Messages...............................................................................................................................................14
5 Service Menu 15
6 Spare Parts 16
6.1 Spare parts list .......................................................................................................................................16
6.1.1 Recorder module, M-REC, Rev. 00 ..................................................................................................16
7 Earlier Revisions 18
APPENDIX A 19
Service Check FORM 1
TABLE OF FIGURES
Figure 1 Recorder Module, M-REC......................................................................................................................3
Figure 2 Recorder board block diagram ..............................................................................................................7
Figure 3 Module Bus connector (X1) pin layout....................................................................................................8
Figure 4 Exploded view of Recorder Module box and Recorder Module...............................................................16

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ii
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 Recorder Module, M-REC

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Recorder Module, M-REC. The REC module is a double width plug-in module
designed for use with the S/5 monitors. Later in this manual may be refered to without the S/5
system nomenclature for simplicity..
Please also refer to the Technical Reference Manual of the S/5 monitor for information regarding
system specific information e.g. related documentation, conventions used, symbols on equipment,
safety precautions, system description, system installation, interfacing, functional check and
planned maintenance.
The Recorder Module, M-REC provides real time printing of waveform and numerical data, and
trend data.
The S/5 Compact Monitors may include a built-in recorder. The built-in recorder is technically the
same as the Recorder Module.
NOTE: Printings on thermal paper may be destroyed when exposed to light, heat, alcohol etc. Take
a photocopy for archive.

Figure 1 Recorder Module, M-REC

NOTE: The Recorder Module, M-REC, cannot be used in the Extension Frame, F-EXT4.
NOTE: The Recorder Module, M-REC functions with all monitor software versions.
NOTE: The Recorder Module, M-REC is not compatible with the Compact Monitor frames that
contain the built-in recorder (F-CMREC, F-CMCREC, F-CMREC1 and F-CMCREC1).

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1 SPECIFICATIONS
Module size, W x D x H 75 x 180 x 112 mm / 3.0 x 7.1 x 4.4 in
Module weight 0.9 kg/ 2 lbs
Power consumption 3W
Principle Thermal array
Print resolution
Vertical 8 dots/mm (200 dots/inch)
Horizontal 32 dots/mm (800 dots/inch) at a speed of 25 mm/s and slower
Paper width 50 mm, printing width 48 mm
Traces Selectable 1, 2, or 3 traces
Print speed 1, 6.25, 12.5, 25 mm/s

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2 FUNCTIONAL DESCRIPTION

2.1 Main components

2.1.1 Recorder board

The function of the recorder board is to establish an interface between the recorder unit and main
CPU board in the monitor. The three front panel keys are connected to the recorder unit via the
recorder board. The recorder unit and the recorder board are connected together with a small
connector board and 12-pin flex-strip cable.

External Communication
Communication with the main CPU board is via a +5 V CMOS level RS232 serial interface, with an
RS485 reset.
Reset The differential RS485 reset from the module bus generates a Recorder Unit reset signal on the
Recorder Board. The Recorder Board also generates a power-up-reset, whose time constant is
approximately 0.1 second. The Recorder Unit reset signal is therefore active when either the
Module Bus RS485-reset or the power-up-reset is active.
+5 V priority The recorder unit supply voltage, +15 VREC, is switched on after +5 V is present.
Front panel keys The recorder board can read the three front panel keys and pass their status on to the main CPU
board.
To protect the keypad signals from static discharges, zener diodes and series resistors are used.
Separate pull-up resistors are not needed because pull-up resistors connecting the keypad input
signals to +5 V are inside the recorder.
Recorder Board

Power-up
Reset
reset
logic Reset

RS-485-Reset
Recorder
Module Serial interface
mother
board +15 V + 15VREC

+5V

Front
panel Switches
membrane
switch

Figure 2 Recorder board block diagram

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2.2 Module bus connector

13 1
25 14

Figure 3 Module Bus connector (X1) pin layout

Table 1 Module Bus connector (X1) pin description

Pin No I/O Signal

1 I RESET_RS485
2 - Not connected
3 I +15 VDIRTY
4 - Not connected
5 - Not connected
6 - Not connected
7 - Ground & Shield
8 I -RESET_RS485
9 O CTSB
10 I RTSB
11 O RXDB
12 I TXDB
13 - Ground & Shield
14 - Not connected
15 I GroundDIRTY
16 - Not connected
17 - Not connected
18 - Not connected
19 - Not connected
20 - Not connected
21 - Not connected
22 - Not connected
23 - Not connected
24 I +5 VDC
25 I +5 VDC

8
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 Recorder Module, M-REC

3 SERVICE PROCEDURES

3.1 General service information

Field service of the Recorder Module, M-REC, is limited to replacing faulty circuit boards or
mechanical parts. Faulty circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
M-NE(12)STPR/M-ESTPR/M-ESTP
Patient simulator
Screwdriver

3.2.2 Recommended parts

Part Order No. Notes
Recorder paper 74205

• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.
1. Check internal parts:
• screws are tightened properly

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Datex-Ohmeda S/5 monitors

• cables are connected properly

• EMC covers are attached properly (Rev. 02 ->)
• there are no loose objects inside the module

?
2. Check external parts:
• the front cover and the front panel sticker are intact
• the module box, latch and the spring locking pin are intact

?
• Reattach the module box and check that the latch moves properly.
3. Open the paper compartment hatch and take out the paper roll, if installed.

Remove any paper chaff from the paper compartment.

Clean the thermal printhead and the small glass window in front of the static brush with a
cotton swab dipped in isopropyl alcohol. Avoid contact with the rubber paper roller.

NOTE: Be careful to limit the application of alcohol to the thermal printhead and the
window.

Leave the paper compartment empty and close the hatch.

?
• Turn the monitor on and wait until the normal monitoring screen appears.
Configure the monitor screen so that all required parameters are shown, for example:
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - ECG1
Field 2 - ECG2
Field 3 - P1
Field 4 - P2
Field 5 - PLETH
Field 6 - OFF
• Insert the Hemodynamic Moduleinto a module slot. Connect a patient simulator to
the module and check that all connected parameters are shown on the screen.
• Preset recording settings:

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 Recorder Module, M-REC

Record/Print - Record Waveforms - Waveform 1 - ECG1

Waveform 2 - P1
Waveform 3 - P2
Delay - Off
Paper Speed - 6.25 Mm/S
Length --> 30 S
Record Trends - Graphic Trend 1 - Hr
Graphic Trend 2 - P1

Monitor Setup - Install/Service (password 16-4-34) - Installation - Printer & Recorder -

Default Trend - Graph.
Display Trends - Time Scale - 2 h
4. Plug in the Recorder Module. Check that the module goes in smoothly and locks up properly.

?
5. Press the RECORD WAVE key on the module front panel. Check that the message “Recorder:
Out of paper” appears on the screen.

?
6. Open the paper compartment cover. Check that the previous message changes to “Recorder:
Cover open”.

Install a paper roll and close the cover. Check that the message “Recorder: Cover open”
disappears from the screen.

?
7. Press the RECORD WAVE key again and check that the module starts recording the selected
waveforms. Press the STOP key on the module front panel to stop recording.

NOTE: If no recording appears, check that the paper roll is installed correctly - only one side
of the paper is printable.

Press the PRINT TRENDS key and check that the module starts recording graphical trends.
Wait until the recording stops.

?
8. Check that the quality of the recordings is acceptable.

?
9. Press the RECORD WAVE key again and this time wait until the recording stops. Check that
the length of the recorded waveform scale is 18.7 cm (±1.5 cm).

Change the paper speed setting to 1 mm/s:

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Record/Print - Record Waveforms - Paper Speed - 1 mm/s

Press the RECORD WAVE key and wait until the recording stops. Check that the length of the
scale is now 3.0 cm (±0.5 cm).

?
10. Perform an electrical safety check and a leakage current test.

?
11. Check that the module functions normally after performing the electrical safety check.

?
12. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the Recorder Module, M-REC, in the following way. See figure 4.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose
latch and spring pin.
3. Open the recorder unit paper loading hatch. With a long blade screwdriver loosen the two
screws at the bottom of the recorder unit housing.
4. Disconnect the 50-pin connector from the back of the recorder unit and 5-pin ribbon
keypad connector from the recorder board.
The recorder unit and front panel frame can now be pulled out of the main body. The front panel
frame is pulled out of the recorder by pulling rearward.
The recorder board is attached to the metal chassis with four screws.

CAUTION The recorder board is fixed to the metal chassis at the factory in a specific position.
The recorder board and chassis must therefore not be separated.
To reassemble the module, reverse the order of the disassembly steps.

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 Recorder Module, M-REC

4 TROUBLESHOOTING

4.1 Troubleshooting chart

Problem Cause Treatment
Module not responding to front panel Membrane switch cable loose or Check the cable. Replace the
keys, but operates through Recorder broken. front panel if necessary.
menu.
M-REC: Flex-strip cable broken Check the cable. Replace if
necessary.
M-REC: Bad contact on connector Check contact.
board.
Recorder will not start. M-REC: Module not properly inserted. Reinsert the module properly.
No error messages shown.
M-REC: Flex-strip cable broken. Check the cable. Replace if
necessary.
M-REC: Connector board loose. Check connector board
connections.
Recorder board faulty. Replace the recorder board.
Recorder unit faulty. Replace the recorder unit.
Recorder works but nothing appears Active side of the paper downwards. Turn the paper roll over.
on the paper.
To test which side is active:
Place the paper on a hard
surface and draw a line with a
fingernail - a dark line will
appear on the active (thermal)
side.
Recorder unit faulty. Replace the recorder unit.

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4.2 Messages
Message Explanation
Recorder: out of paper Release paper jam or insert a roll of paper into the recorder.
Recorder: cover open Close the recorder cover correctly.
Recorder: thermal array overheat Recorder overheated. Stop using and allow it to cool down.
Recorder: input voltage low +15 Vrec is too low. Check flex-strip cable and connector board.
Recorder: input voltage high +15 Vrec is too high. Check flex-strip cable and connector board.
Recorder system error System error. Remove the recorder module and reinsert it.
1, 2, 3 If the problem persists, replace the recorder unit.
Recorder: module removed The module not in place, or a communication error due to a fault in the
module or in the main CPU board.

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 Recorder Module, M-REC

5 SERVICE MENU
There is no service menu for the Recorder Module, M-REC.

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6 SPARE PARTS

6.1 Spare parts list

NOTE: Spareparts for all revisions of a modude are in one spare part list. In case there are more
than one sparepart order number for the same item: check the revision or possible adaptation of
the part that correspond your device. In 'Replaced by' column you find the replacing order number
for a sparepart that is not available anymore.

6.1.1 Recorder module, M-REC, Rev. 00

Figure 4 Exploded view of Recorder Module box and Recorder Module

Item Description Order No. Replaced by

- Membrane keypad 879372
1 Module box (wide) 886168
2 Latch 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel unit, M-REC 881328
6 Metal chassis with recorder board 883384
6 Recorder board, M-REC (Rev.00) 880313 883384
7 Thermal plott.for REC,50,seril.76.8kB 90350
8 50-pin connector cable, M-REC 879362
9 Metal chassis 879179 883384
9 Metal chassis with recorder board 881964 883384
9 Metal chassis with recorder board 883384
10 Front panel sticker, DA ; M-REC (rev.00-02) 892220 898857
10 Front Panel sticker, DA ; M-REC (rev.03) ; S/5 898857
10 Front Panel sticker, DE ; M-REC (rev.00-02) 880486 898848
10 Front Panel sticker, DE ; M-REC (rev.03) ; S/5 898848
10 Front Panel sticker, EN ; M-REC (rev.00-02) 879483 898847
10 Front Panel sticker, EN ; M-REC (rev.03) ; S/5 898847

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10 Front Panel sticker, ES ; M-REC (rev.00-02) 884388 898851

10 Front Panel sticker, ES ; M-REC (rev.03) ; S/5 898851
10 Front Panel sticker, FI ; M-REC (rev.00-02) 888875 898854
10 Front Panel sticker, FI ; M-REC (rev.03) ; S/5 898854
10 Front Panel sticker, FR ; M-REC (rev.00-02) 880172 898849
10 Front Panel sticker, FR ; M-REC (rev.03) ; S/5 898849
10 Front Panel sticker, IT ; M-REC (rev.00-02) 886761 898852
10 Front Panel sticker, IT ; M-REC (rev.03) ; S/5 898852
10 Front Panel sticker, JA ; M-REC (rev.00-02) 888310 8000384
10 Front Panel sticker, JA ; M-REC (rev.03) ; S/5 8000384
10 Front Panel sticker, NL ; M-REC (rev.00-02) 886066 898850
10 Front Panel sticker, NL ; M-REC (rev.03) ; S/5 898850
10 Front Panel sticker, NO ; M-REC (rev.00-02) 893573 898856
10 Front Panel sticker, NO ; M-REC (rev.03) ; S/5 898856
10 Front Panel sticker, PT ; M-REC (rev.00-02) 895241 898853
10 Front Panel sticker, PT ; M-REC (rev.03) ; S/5 898853
10 Front Panel sticker, SV ; M-REC (rev.00-02) 885869 898855
10 Front Panel sticker, SV ; M-REC (rev.03) ; S/5 898855
11 Metal cover plate, M-REC 885292

NOTE: When part 883384 is used, 50-pin connector cable 879362 is not needed.
Front panel stickers that are related to the Compact Module type and adaptation:
Adaptation codes:
DA=Danish,
DE=German,
EN=English,
ES=Spanish,
FI=Finnish,
FR=French,
IT=Italian,
JA=Japanese,
NL=Dutch,
NO=Norwegian,
PT=Portuguese,
SV=Swedish

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7 EARLIER REVISIONS
For service information on the earlier revisions, please refer to:
Recorder Module revision 00 Service Manual p/n 880850
Recorder Module revision 01 Service Manual p/n 882580

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APPENDIX A

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 APPENDIX A, Service check form

SERVICE CHECK FORM

Recorder Module, M-REC

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Paper compartment 4. Installation

cleaning
Notes

5. Paper recognition 6. Cover state recognition

7. Front panel 8. Quality of recording

membrane keys
Notes

9. Recording speed
6.25 mm/s 17.2 - 20.2 cm
1.0 mm/s 2.5 - 3.5 cm

10. Electrical safety check 11. Functioning after

electrical safety check
12. Final cleaning

Notes

Used Spare Parts

Signature

A-1(1)
Document No. 8001016-3
Datex-Ohmeda S/5 monitors

Document No. 8001016-3

 Datex-Ohmeda
S/5™ Nellcor Compatible Saturation Module, M-NSAT (Rev. 04)
S/5™ Datex-Ohmeda Oxygen Saturation Module, M-OSAT (Rev.01)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8005426-1

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Nellcor Compatible Saturation Module, M-NSAT
Datex-Ohmeda Oxygen Saturation Module, M-OSAT
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 3
1 Specifications 5
1.1 General specifications ..........................................................................................................................5
1.2 Typical performance of M-NSAT..04 ......................................................................................................5
1.3 Typical performance of M-OSAT.............................................................................................................6
2 Functional description 7
2.1 Main components of M-NSAT..04..........................................................................................................7
2.2 Main components of M-OSAT................................................................................................................7
2.2.1 NIO and OIO Interface board .........................................................................................................8
2.3 Connectors and signals.......................................................................................................................10
2.3.1 Module bus connector................................................................................................................10
2.3.2 Other connectors........................................................................................................................10
3 Service Procedures 11
3.1 General service information ................................................................................................................11
3.2 Service check.....................................................................................................................................12
3.2.1 Recommended tools ..................................................................................................................12
3.3 Disassembly and reassembly..............................................................................................................15
4 Troubleshooting 16
4.1 Troubleshooting chart .........................................................................................................................16
4.2 Troubleshooting flowchart ...................................................................................................................17
5 Service MENU 18
5.1 M-NSAT menu ....................................................................................................................................19
6 Spare Parts 20
6.1 Nellcor Compatible Saturation Module, M-NSAT rev. 00, 01, 02, 03.....................................................20
6.2 Nellcor Compatible Saturation Module, M-NSAT rev. 04.......................................................................22
6.3 Datex-Ohmeda Oxygen Saturation Module, M-OSAT rev. 00, 01 ...........................................................24
7 Earlier Revisions 26
APPENDIX A 27
Service check FORM A-1

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TABLE OF FIGURES
Figure 1 Nellcor Compatible Saturation Module, M-NSAT..04................................................................................ 3
Figure 2 Datex-Ohmeda Oxygen Saturation Module, M-OSAT ................................................................................. 3
Figure 3 NIO and OIO Interface board block diagram........................................................................................... 8
Figure 4 Module troubleshooting flowchart .......................................................................................................17
Figure 5 Exploded view of M-NSAT single module..............................................................................................20
Figure 6 Exploded view of M-NSAT Rev. 00, 01, 02, 03.....................................................................................20
Figure 7 Exploded view of M-NSAT Rev. 04 ......................................................................................................23
Figure 8 Exploded view of M-OSAT module .......................................................................................................24

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 Oxygen Saturation Modules, M-NSAT, M-OSAT

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda Nellcor Compatible Saturation Module, M-NSAT and the Datex-Ohmeda Oxygen
Saturation Module, M-OSAT. The M-NSAT and M-OSAT are single width plug-in modules designed
for use with S/5 monitors. Later in this manual modules may be referred to w/o the system name
S/5 for simplicity.
Please refer to the Technical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
The M-NSAT module utilizes Nellcor pulse oximetry algorithm and it should be used only with
Nellcor pulse oximetry sensors specified in the Instructions for use sheet accompanying the
module.
The M-OSAT module utilizes Datex-Ohmeda pulse oximetry algorithm and it should be used with
Datex-Ohmeda OxyTip+ sensors and sensors specified in the Instructions for use sheet
accompanying the module.
The monitors allow only one pulse oximetry source at a time. If M-NE(12)STPR/M-NE(12)STR/M-
ESTPR/M-ESTR and M-NSAT or M-OSAT modules are plugged in the monitor simultaneously, then
M-NSAT or M-OSAT overrides modules mentioned above as a pulse oximetry source.

Figure 1 Nellcor Compatible Saturation Figure 2 Datex-Ohmeda Oxygen Saturation

Module, M-NSAT..04 Module, M-OSAT

NOTE: The M-NSAT and M-OSAT modules function only with monitor software versions 94 or later.

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WARNING To prevent erroneous readings, do not use physically damaged sensors, sensor
cables or modules. Discard a damaged sensor or sensor cable immediately.
Never repair a damaged sensor or cable; never use a sensor or cable repaired by
others. A damaged sensor or a sensor soaked in liquid may cause burns during
electrosurgery.

WARNING Inaccurate SpO2 data can result if a sensor is past its useful life. Therefore, re-
evaluate the measurement periodically by performing additional assessment of
the patient and equipment, including consideration of use of alternate
monitoring methods such as direct measurement of arterial oxyhemoglobin
(SaO2).

WARNING Allow sensor and cable to dry completely after cleaning. Moisture and dirt on
the connector may affect the measurement accuracy.

WARNING Data validity. Conditions that may cause inaccurate readings and impact
alarms include interfering substances, excessive ambient light, electrical
interference, ventricular septal defects (VSD), excessive motion, low perfusion,
low signal strength, incorrect sensor placement, poor sensor fit, and/or
movement of the sensor on the patient.

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 Oxygen Saturation Modules, M-NSAT, M-OSAT

1 SPECIFICATIONS

1.1 General specifications

Module size, (W × D ×H) 37 × 180 × 112 mm/1.5 × 7.1 × 4.4 in
Module weight 0.4 kg/1 lbs
Power consumption 3W

1.2 Typical performance of M-NSAT..04

Measurement range and
display range 20 to 100 %
Calibration range 70 to 100%
Accuracy 100 to 70 %: ±2 digits to ±3.5 digits
(% ±1 SD)1 (depends on the sensor used)
20 to 69 %: unspecified
Resolution 1 digit = 1 %
Display averaging 5...7 s
Display update 5s
Pulse beep pitch Varies with SpO2 level
The monitor is calibrated over the measurement range against functional saturation SpO2 (func).
ALARM
Alarm default limits
high alarm OFF
low alarm 90%
HEART RATE FROM PLETH
Measurement range 30 to 250 bpm
Accuracy ±3 bpm
Resolution 1 bpm
Display averaging 5...7 s
Adjustable pulse beep volume
PLETH WAVEFORM
Scales Automatic scaling

Protection against electrical shock Type BF

1 1 SD (standard deviation) = 68 % of all readings in the specified range in stable conditions.

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1.3 Typical performance of M-OSAT

Measurement range and
display range 20 to 100 %
Calibration range 70 to 100%
Accuracy 100 to 70 %: ±2 digits
±3% digits
(during clinical motion condition)
(% ±1 SD)1 20 to 69 %: unspecified
Resolution 1 digit = 1 %
Display averaging 12 s typical
Display update 5s
Pulse beep pitch Varies with SpO2 level
The monitor is calibrated over the measurement range against functional saturation SpO 2 (func).
ALARM
Alarm default limits
high alarm OFF
low alarm 90%
PULSE RATE FROM PLETH
Measurement range 30 to 250 bpm
Accuracy ±2 digits or ±2 bpm, whichever is greater
Resolution 1 bpm
Display averaging 12 s typical
Adjustable pulse beep volume
PLETH WAVEFORM
Scales Automatic scaling
Protection against electrical shock
Type BF

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 Oxygen Saturation Modules, M-NSAT, M-OSAT

2 FUNCTIONAL DESCRIPTION

2.1 Main components of M-NSAT..04

The M-NSAT module consists of the following parts
• SpO2 pre-amplifier board
• Sensor connector cable
• Nellcor Pulse Oximeter Module MP-404
• NSAT interface board (NIO)
Sensors can be plugged into the M-NSAT module using the sensor extension cable MC-10
available from Nellcor. Sensors are plugged into a 9-pin female connector (D-type) on the end of
the extension cable MC-10. The extension cable is plugged into a 14-pin connector on the front
panel of the module. This connector is mounted on a small pre-amplifier board, which is connected
by a flat cable to the MP-404.
The MP-404 is a surface mounted PC board manufactured by Nellcor Incorporated. It contains the
signal processing electronics and software that are based on Nellcor’s stand-alone pulse
oximeters. The MP-404 is used with an external preamplifier.
The measured SpO2 and pulse rate values, as well as status information, are transferred from the
MP-404 to the NIO interface board. Communication between the MP-404 and NIO interface board
is established through an RS232C serial interface. The NIO interface board, in turn, transmits the
measurement information to the module bus of the monitor through RS485 serial interface.

2.2 Main components of M-OSAT

The M-OSAT module consists of the following parts
• SpO2 sensor board and cable set
• Datex-Ohmeda Proloque module board
• OIO interface board
The sensor can be plugged into the M-OSAT module either directly or using sensor extension cables
available from Datex-Ohmeda. Sensors are plugged into a 9-pin female connector (Datex-
Ohmeda) on the front panel of the module. This connector is mounted on a small PC board, which
is connected to the Proloque board by a cable. The EMC ferrite of this cable is mounted on the back
of the front panel.
The Proloque board is a surface mounted PC board manufactured by Datex-Ohmeda. It contains
the signal processing electronics and software. The Proloque board is used with an internal
preamplifier.
The measured SpO2 and pulse rate values, as well as status information, are transferred from the
Proloque board to the OIO interface board. Communication between the Proloque board and OIO
interface board is established through an RS232C serial interface. The OIO interface board, in turn,
transmits the measurement information to the module bus of the monitor through an RS485 serial
interface.

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2.2.1 NIO and OIO Interface board

Module bus connector

RS485 RS485 Power-up Power;

Driver for Driver for reset non-isolated
data module reset section

Opto isolation Patient isolation Isolation transformer

Microprocessor, 488 byte internal RAM, 16kbyte Power;

internal ROM; 16MHz isolated
section

+5V,+15V,-15V
Non-volatile
supply voltages to
UART memory
Nellcor oximetermodule
or Proloque module
(+5 to Proloque only)

Bidirectional asynchronous
serial communication to
Nellcor oximeter module
or Proloque module

Figure 3 NIO and OIO Interface board block diagram

RS485 drivers
There are drivers for data and for module reset functions.
These drivers are used for driving the RS485 type serial communication bus between the module
and the Central Unit. Data transmission speed of the bus is 500 kbps.
In addition to RS485 bus RESET, there is a Power-up reset, which keeps the RESET pin of the CPU
active during power up for about 500 ms despite of the state at the RS485 bus RESET. This is used
to prevent the sending of RS485 data during the RESET of the module.

Power supply, non-isolated section

The power supply is a half bridge type switched mode circuit, where the driver FETs are controlled
by a quartz oscillator. The load of the half bridge is the primary of the isolation transformer. The
voltage, +15 Vdirty from the Central Unit is used as the supply voltage of the switched mode circuit.

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Power supply, isolated section

The secondary voltages of the isolation transformer are rectified, filtered and +5V regulated . The
voltages can be measured from the test connector X11. See Chapter 2.3.2 Other connectors.

Opto isolation
The signals of the serial communication bus between the NIO or OIO Interface board and the
Central Unit are transferred through the patient isolation by high speed opto couplers.

Microprocessor, UART, non-volatile memory

The microprocessor with on-chip memory has been used to convert and transfer data from Nellcor
pulse oximeter module MP-404 or Proloque module to the monitor.
The communication between MP-404 or Proloque board and the CPU of NIO or OIO Interface board
is realized with bi-directional asynchronous serial communication via the UART.
The non-volatile memory has been used to store identification information like serial number,
control number, date etc.

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Module bus connector (X1)

Pin No I/O Signal
1 I RESET_RS485*
2 I -15 VDC
3 I +15 VDIRTY*
4 I +15 VDC
5 I/O -DATA_RS485*
6 I/O DATA_RS485*
7 - Ground & Shield*
8 I -RESET_RS485*
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 - Ground & Shield*
14 I +32 VDIRTY
15 I GroundDIRTY*
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 - ON/STANDBY
21 - BIT0IN
22 - RXDD_RS232
23 - TXDD_RS232
24 I +5 VDC
25 I +5 VDC
*Used in the M-NSAT and M-OSAT modules

2.3.2 Other connectors

Test connector (X11)
Pin No Voltage Name Note
1 +5V +5VTEST Supply voltage to the NSAT-board (NIO)
2 +5V +5Vn Supply voltage to the MP-404 board
(Proloque module)
3 +14…17V +15Vn Supply voltage to the MP-404 board
4 - GND FGND
5 --14…-17V -15V -15Vn
6 - - N/C

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-NSAT or M-OSAT module is limited to replacing faulty circuit boards or
mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
M-NE(12)STPR/M-ESTPR/M-ESTP
Datex-Ohmeda SpO2 finger probe
Nellcor SpO2 finger probe with MC-10 cable or Datex-Ohmeda
OxyTip+ finger probe
Screwdriver

• Detach the module box by removing the two screws from the back of the module. Be careful
with loose latch and spring pin for locking.

1. Check internal parts:

− screws are tightened properly
− cables are connected properly
− all IC’s that are on sockets are attached properly
− EMC covers are attached properly
− there are no loose objects inside the module
− M-OSAT and M-NSAT ferrite of the cable sets are attached properly

?
2. Check external parts:
− the front cover and the front panel sticker are intact
− the probe connector and the cable lock (M-NSAT rev. 01 ->) are intact and are
attached properly
− the module box, the latch and the spring pin are intact

?
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until normal monitoring screen appears.

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• Configure the monitor screen so that all the needed parameters are shown, for example as
follows:
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - ECG1
Field 2 - ECG2
Field 3 - P1
Field 4 - P2
Field 5 - PLETH
Field 6 - OFF

Monitor Setup - Install/Service (password 16-4-34) - Installation - Interfacing - SpO2 - Module

• Make sure that the other SpO2 module M-NE(12)STPR/M-ESTPR/M-ESTP is connected,

and therefore, the SpO2 waveform field is shown on the screen.
• Connect the Datex-Ohmeda SpO2 finger probe to the module and attach the probe onto
your finger. Check that SpO2 waveform appears onto the screen.

3. Plug in the M NSAT or M-OSAT module. Check that it goes in smoothly and locks up properly.

?
4. Check that the M-NSAT or M-OSAT module is recognized, i.e. the SpO2 waveform with related
values disappear from the screen within 30 seconds. The empty SpO2 waveform field should
remain with the message ‘No probe’.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding NSAT or OSAT software by selecting SCROLL VERS and
turning the ComWheel.

?
6. Enter the M-NSAT/M-OSAT service menu:

Parameters - M-SAT

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the module’s ROM memory has passed the
internal memory test, i.e. the ‘ROM’ shows OK.

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7. M-NSAT: Check that the SpO2 probe related status information in the menu is correct. Only
the ‘NoProbe’ should be active (1) when no probe is connected.

M-OSAT and M-NSAT..04: The status information in the service menu is not valid for the M-
OSAT/M-NSAT..04. Check that the message ‘No Probe’ is displayed on the screen when no
probe is connected.

?
8. M-NSAT: Check that all three error indicators, ‘Preamp Error’, ‘QUART Error’ and ‘I/O Error’
show NO.

M-OSAT and M-NSAT..04: The error indicators in the service menu are not valid for the M-
OSAT/M-NSAT..04.

?
9. Connect a suitable SpO2 finger probe to the module.

Check that the message ‘No Probe’ changes to ‘Check Probe’ on the monitor screen.

M-NSAT: Check that the corresponding status information is updated correctly in the
service menu.

?
10. Connect the SpO2 probe onto your finger. Check that the reading of 95-100 and proper
SpO2 waveform appear.

?
11. Perform electrical safety check and leakage current test.

?
12. Check that the module functions normally after the performed electrical safety check.

?
13. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

Disassemble the M-NSAT or M-OSAT module in the following way. See also the exploded view of
the module.
1. Remove the 2 screws from the rear of the module and detach the module box. Be careful
with the loose latch and spring pin.
2. Bend the metal tabs that hold the EMC-cover to an upright position and lift the cover off.
3. Remove the 3 screws that secure the SpO2 measurement board to the Interface board.
4. Hold the SpO2 measurement board as near the module bus connector as possible and lift
the board up carefully.
5. Disconnect the cable that comes from the front panel unit and the flat cable that comes
from the Interface board.
Reassembling is essentially reversing the above described actions.
NOTE: When installing the SpO2 measurement board, make sure that the pin connector on the
SpO2 measurement board connects properly with the connector on the Interface board
underneath.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Problem Cause Treatment
Message ‘No probe’ 1. No probe connected to the module 1. Check probe connections
2. Probe faulty 2. Change probe
3. Wrong type of probe (not specified to be 3. Change probe (see possible probe types: User’s
used with this module) Reference Manual)

Message ‘Check probe’ 1. No probe attached to the patient 1. See that the probe is properly attached to the
2. The extension cable not connected to the patient
probe 2. Check that the probe is connected to the cable
3. Unsuitable site 3. Try another place
4. Probe faulty 4. Change probe
5. Wrong type of probe (not specified to be 5. Change probe (see possible probe types from
used with this module) User’s Reference Manual)

Finger probe falls off 1. Probe is slippery 1. Follow Nellcor’s or Datex-Ohmeda’s instructions on
2. Finger is too thin or thick this matter
2. Try other fingers or other probe types
Weak signal artifacts 1. Poor perfusion Try another place
2. Movement artifacts
3. Shivering
Message ‘No pulse’ Acceptable pulses were present but have Try other fingers
now ceased for 10 seconds

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4.2 Troubleshooting flowchart

Possible faulty
NSAT or OSAT
module

Insert NSAT or OSAT Take all modules

and enter the service out from the Central
menu Unit

Does Fault not in

No
fault still appear NSAT or OSAT
? module

Yes

'ROM'
shows '?' in Yes Replace the
service Interface board
menu

No
Yes

Does
Module-ID No another module No
on screen? work in the
same
slot?
Yes

Replace Nellcor's
Preamp Yes
MP-2(4)03(4) board or
ID?
Proloque board

No

Check interface
osat trbl.vsd

board. Replace if
necessary

Figure 4 Module troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key

2. Select Install/Service (password 16-4-34)

3. Select Service (password 26-23-8)

4. Select Parameters - M-SAT (use for M-NSAT and M-OSAT )

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5.1 M-NSAT menu

NSAT Data
NOTE: Preamp Error is indicated on the service menu, even though module contains MP-204
board.
NOTE: The status and error indicators are not valid for the M-OSAT and the M-NSAT..04 revision.
PR shows the pulse rate value [bpm] calculated from pleth.
SpO2% shows the oxygen saturation value multiplied by 100.
Next are listed the messages that are sent from the module to the monitor. Digit ‘0’ means that the
message is not active, ‘1’ is for the active one.
Preamp Error indicates ‘Yes’ if the Preamp (MP-203(4)) board detects an error.
QUART Error indicates ‘Yes’ if an error is detected in the operation of QUART that is located in the
Interface board.
I/O Error indicates ‘Yes’ if an error occurs in the communication between Preamp (MP-203(4)) and
Interface board.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
ROM indicates whether the checksum in the EPROM is in accordance with the one the software has
calculated.
The state is either OK, Fail or ? (module not in place or a communication error).

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6 SPARE PARTS

6.1 Nellcor Compatible Saturation Module, M-NSAT rev. 00, 01, 02, 03

Figure 5 Exploded view of M-NSAT single module

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel frame, M-NSAT (rev.00) 884012 887842
5 Front panel frame, M-NSAT (Rev.01) 887842

Figure 6 Exploded view of M-NSAT Rev. 00, 01, 02, 03

Item Description Order No. Replaced by

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Item Description Order No. Replaced by

6 Cross cylinder-head screw M3x12 628700
6 Interface board, M-NSAT 884383
7 SpO2 Measurement Board Spare Part Kit for M-NSAT 898000
7 SpO2 measuring board (Kit), M-NSAT 90310 898000
8 Connector-access, jumper, pitch gr/bl/r 54091
9 Connector board, M-NSAT 884950
10 Front Panel sticker, DA ; M-NSAT (rev.01-02) 892216 898920
10 Front Panel sticker, DA ; M-NSAT (rev.03) ; S/5 898920
10 Front Panel sticker, DE ; M-NSAT (rev.00) 885779
10 Front Panel sticker, DE ; M-NSAT (rev.01-02) 888297 898911
10 Front Panel sticker, DE ; M-NSAT (rev.03) ; S/5 898911
10 Front Panel sticker, EN ; M-NSAT (rev.00) 884424
10 Front Panel sticker, EN ; M-NSAT (rev.01-02) 888296 898910
10 Front Panel sticker, EN ; M-NSAT (rev.03) ; S/5 898910
10 Front Panel sticker, ES ; M-NSAT (rev.00) 886192
10 Front Panel sticker, ES ; M-NSAT (rev.01-02) 888299 898914
10 Front Panel sticker, ES ; M-NSAT (rev.03) ; S/5 898914
10 Front Panel sticker, FI ; M-NSAT (rev.01-02) 888874 898917
10 Front Panel sticker, FI ; M-NSAT (rev.03) ; S/5 898917
10 Front Panel sticker, FR ; M-NSAT (rev.00) 885780
10 Front Panel sticker, FR ; M-NSAT (rev.01-02) 888298 898912
10 Front Panel sticker, FR ; M-NSAT (rev.03) ; S/5 898912
10 Front Panel sticker, IT ; M-NSAT (rev.00) 886759
10 Front Panel sticker, IT ; M-NSAT (rev.01-02) 888337 898915
10 Front Panel sticker, IT ; M-NSAT (rev.03) ; S/5 898915
10 Front Panel sticker, JA ; M-NSAT (rev.01-02) 888317 8000386
10 Front Panel sticker, JA ; M-NSAT (rev.03) ; S/5 8000386
10 Front Panel sticker, NL ; M-NSAT (rev.00) 886125
10 Front Panel sticker, NL ; M-NSAT (rev.01-02) 888336 898913
10 Front Panel sticker, NL ; M-NSAT (rev.03) ; S/5 898913
10 Front Panel sticker, NO ; M-NSAT (rev.01-02) 893560 898919
10 Front Panel sticker, NO ; M-NSAT (rev.03) ; S/5 898919
10 Front Panel sticker, PT ; M-NSAT (rev.01-02) 895255 898916
10 Front Panel sticker, PT ; M-NSAT (rev.03) ; S/5 898916
10 Front Panel sticker, SV ; M-NSAT (rev.00) 886126
10 Front Panel sticker, SV ; M-NSAT (rev.01-02) 888335 898918
10 Front Panel sticker, SV ; M-NSAT (rev.03) ; S/5 898918
11 Cross cylinder-head screw M3x6 61721
11 Metal frame 879184
12 Insulating plate 1, M-NSAT 884700
13 Insulating plate 2, M-NSAT 884705
14 EMC Cover, M-NSAT 884701
15 Cross cylinder-head screw M3x8 628712
16 Bushing 63392
17 Cable lock, M-NSAT 887706

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6.2 Nellcor Compatible Saturation Module, M-NSAT rev. 04

NOTE: Check that the jumper J5 of the MP-404 board has been removed.
NOTE: Removed part 8, jumpers of the NIO interface board.

Item Item description Order No. Replaced by

1 Module box (single width) 886167
2 Spring pin 879182
3 Latch 879181
4 Cross recess screw M3x8 black 616215
5 Front panel frame, M-NSAT (Rev. 04) 8003170
6 Interface board, NIO/OIO spare part 8003862
Cross cylinder head PT-screw 3x12 628700
7 MP-404 measurement board spare part 90313 8004263
8 Jumper (removed from the board) 54091
9 Pre-amplifier board, M-NSAT 8002220
Cross cylinder head PT-screw 2,2x8 628701
10 Front panel sticker, DA, M-NSAT (Rev. 04) 8003115
10 Front panel sticker, DE, M-NSAT (Rev. 04) 8003106
10 Front panel sticker, EN, M-NSAT (Rev. 04) 8003105
10 Front panel sticker, ES, M-NSAT (Rev. 04) 8003109
10 Front panel sticker, FI, M-NSAT (Rev. 04) 8003112
10 Front panel sticker, FR, M-NSAT (Rev. 04) 8003107
10 Front panel sticker, IT, M-NSAT (Rev. 04) 8003110
10 Front panel sticker, JA, M-NSAT (Rev. 04) 8003116
10 Front panel sticker, NL, M-NSAT (Rev. 04) 8003108
10 Front panel sticker, NO, M-NSAT (Rev. 04) 8003114
10 Front panel sticker, PT, M-NSAT (Rev. 04) 8003111
10 Front panel sticker, SV, M-NSAT (Rev. 04) 8003113
11 Metal frame 879184
Cross cylinder head screw M3x6 61721
12 Insulation plate 1., M-NSAT 8001919
13 Insulation plate 2., M-NSAT 8001920
14 EMC-cover, M-NSAT 8001546
15 Cross cylinder-head screw M3x8 -
16 Bushing 640430 63392
17 Flat cable M-NSAT/M-OSAT 8001925
18 M-NSAT pre-amp cable 8003173

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Figure 7 Exploded view of M-NSAT Rev. 04

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6.3 Datex-Ohmeda Oxygen Saturation Module, M-OSAT rev. 00, 01

Figure 8 Exploded view of M-OSAT module

Item Description Order No. Replaced by

Cable set for M-OSAT 90503
1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front Panel Unit, M-OSAT : S/5 8001924
6 Cross cylinder-head screw M3x12 628700
6 Interface board, M-OSAT ; S/5 8001452
7 SpO2 measurement board ; S/5 90504
8 Bushing 63392
9 Flat Cable, M-OSAT ; S/5 8001925
10 Front Panel sticker, DA ; M-OSAT ; S/5 8001823
10 Front Panel sticker, DE ; M-OSAT ; S/5 8001814
10 Front Panel sticker, EN ; M-OSAT ; S/5 8001813
10 Front Panel sticker, ES ; M-OSAT ;S/5 8001817
10 Front Panel sticker, FI ; M-OSAT ; S/5 8001820
10 Front Panel sticker, FR ; M-OSAT ; S/5 8001815
10 Front Panel sticker, IT ; M-OSAT ; S/5 8001818
10 Front Panel sticker, JA ; M-OSAT ; S/5 8001824
10 Front Panel sticker, NL ; M-OSAT ; S/5 8001816
10 Front Panel sticker, NO ; M-OSAT ; S/5 8001822

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Item Description Order No. Replaced by

10 Front Panel sticker, PT ; M-OSAT ; S/5 8001819
10 Front Panel sticker, SV ; M-OSAT ; S/5 8001821
11 Cross cylinder-head screw M3x6 61721
11 Metal frame 879184
12 PCB-isolator plate, M-OSAT ; S/5 8001919
13 Connector isolator plate, M-OSAT : S/5 8001920
14 EMC cover, M-OSAT ; S/5 8001546

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7 EARLIER REVISIONS
This manual fully supports earlier revisions of M-NSAT and M-OSAT modules.

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APPENDIX A

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 APPENDIX A, Service check form, M-NSAT, M-OSAT

SERVICE CHECK FORM

Nellcor Compatible Saturation Module, M-NSAT
Datex-Ohmeda Oxygen Saturation Module, M-OSAT
Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation

4. Recognition

5. Module software NIO/OIO

Nellcor / Proloque
6. Communication and 7. SpO2 probe status
memories
8. Error status 9. SpO2 probe detection

10. Test measurement

11. Electrical safety check 12. Functioning after

electrical safety check
13. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A-1(1)
Document No. 8005426-1
Datex-Ohmeda S/5 monitors

Document No. 8005426-1

 Datex-Ohmeda
S/5TM NeuroMuscular Transmission Module, M-NMT (Rev. 02)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 1018-3

September 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
mailto:product.support.ussub@us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
www.us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
NeuroMuscular Transmission Module, M-NMT
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 3
1.1 General specifications ..........................................................................................................................3
1.2 Technical specifications........................................................................................................................3
1.2.1 NMT.............................................................................................................................................3
1.2.2 Stimulator....................................................................................................................................3
1.2.3 Regional block mode....................................................................................................................3
2 Functional description 4
2.1 Measurement principle .........................................................................................................................4
2.1.1 Nerve stimulation .........................................................................................................................4
2.1.2 Response ....................................................................................................................................5
2.1.3 Regional block .............................................................................................................................5
2.2 Main components.................................................................................................................................5
2.2.1 NMT board ...................................................................................................................................5
2.3 Connectors and signals.........................................................................................................................7
2.3.1 Module bus connector..................................................................................................................7
2.3.2 Front panel connector...................................................................................................................8
3 Service procedures 9
3.1 General service information ..................................................................................................................9
3.2 Service check.....................................................................................................................................10
3.2.1 Recommended tools ..................................................................................................................10
3.3 Disassembly and reassembly..............................................................................................................14
4 Troubleshooting 15
4.1 Troubleshooting chart .........................................................................................................................15
4.2 Troubleshooting flowchart ...................................................................................................................16
5 Service Menu 17
5.1 NMT menu..........................................................................................................................................18
6 Spare parts 20
6.1 Spare part list.....................................................................................................................................20
6.1.1 NMT Module, M-NMT rev. 00, 01, 02 ..........................................................................................20
7 Earlier revisions 22
APPENDIX A 23
Service check form A-1

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Datex-Ohmeda S/5 monitors

TABLE OF FIGURES
Figure 1 NeuroMuscular Transmission Module, M-NMT ....................................................................................... 1
Figure 2 Principle of response measurement ...................................................................................................... 5
Figure 3 Serial communication and opto isolation............................................................................................... 6
Figure 4 Stimulator block diagram...................................................................................................................... 6
Figure 5 Module troubleshooting flowchart .......................................................................................................16
Figure 6 Exploded view of NMT Module.............................................................................................................20

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 NeuroMuscular Transmission Module, M-NMT

INTRODUCTION
This section provides information for the maintenance and service of the NeuroMuscular
Transmission Module, M-NMT. The M-NMT module is a single width plug-in module designed for
use with the S/5 Anesthesia and Compact Anesthesia Monitors. Later in this manual modules can
be called w/o system name Datex-Ohmeda S/5.
Please see also theTechnical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
The module contains peripheral nerve stimulation and response measurement, which supports
electromyography EMG. The module can also be used as a nerve locator for regional nerve blocking
with a regional block cable. However, in this case there is no response measurement.

Figure 1 NeuroMuscular Transmission Module, M-NMT

The M-NMT requires monitor software S-xxx95 or greater.

From the M-NMT rev.01 onwards the module has contained a memory for storing stimulus current
and reference response data. The memory function requires monitor software S-xxx97 or greater.

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 NeuroMuscular Transmission Module, M-NMT

1 SPECIFICATIONS
1.1 General specifications
Module size, W × D × H 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.37 kg /0.8 lbs
Power consumption 3.3 W

1.2 Technical specifications

1.2.1 NMT
Stimulation modes Train of four (TOF)
Double burst (3.3) (DBS)
Single twitch (ST)
50 Hz tetanus + post tetanic count (PTC)
Measurement intervals for TOF and DBS
Manual; 10 s, 12 s, 15 s, 20 s, 1 min, 5 min, 15 min
Measurement intervals for ST Manual; 1 s, 10 s, 20 s
1.2.2 Stimulator
Stimulus pulse Square wave, constant current
Pulse width 100, 200 or 300 µs
Stimulus current range 10...70 mA with 5 mA steps
Stimulus current accuracy 10 % or ±3 mA whichever is the greater
Max. load 3 kΩ
Max. voltage 300 V
1.2.3 Regional block mode
Stimulation modes Single twitch
Intervals 1 s, 2 s, 3 s
Stimulus pulse Square wave, constant current
Pulse width 40 µs
Stimulus current range 0...5.0 mA with 0.1 mA steps
Stimulus current accuracy 20 % or 0.3 mA whichever is the greater

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2 FUNCTIONAL DESCRIPTION
2.1 Measurement principle
2.1.1 Nerve stimulation
There are three stimulus modes in the NeuroMuscular Transmission Module: Train of Four (TOF),
Double Burst 3,3 (DBS) and Single Twitch (ST).
In the Train of Four stimulus mode, four stimulation pulses are generated at 0.5 second intervals.
The response is measured after each stimulus and the ratio of the fourth and first response of the
TOF sequence is calculated (TOF%).
NOTE: If the first response does not exceed a certain signal level, TOF% is not calculated due to
poor accuracy.
Double burst (3,3) stimulation includes two bursts with a 750 ms interval. Both bursts consist of
three pulses separated by 20 ms intervals. The responses of both bursts are measured, and the
ratio of the second and first response is calculated (DBS%). EMG responses are measured
immediately after the first stimulus pulse of both bursts.
In Single Twitch stimulation, one stimulation pulse is generated. The response is measured after
the stimulus. In order to prevent decurarization of the stimulated area, the measurement is
automatically stopped after 5 minutes stimulation in 1 sec cycle time.

Tetanic/PTC
Tetanic/PTC (Post Tetanic Count) can measure deeper relaxation than TOF. The tetanic stimulation
is produced when Start is chosen under Tetanic/PTC. The length of stimulation is 5 seconds. The
stimulation generates pulses with a frequency of 50 Hz and with a selected pulse width and
current. After tetanic stimulation and a three second delay, Single Twitch stimulation is produced
to detect the post tetanic count (PTC). PTC describes the number of responses detected after
tetanic stimulation. If there is no response, the measurement will be stopped. If responses will not
fade away, a maximum of 20 responses will be calculated. If more can be detected, the PTC value
is displayed only as '> 20' and measurement will be stopped. If the TOF, DBS or ST measurement
cycle was on when tetanic stimulation started, the cycle will continue after the PTC. After
completing the PTC measurement during 1 minute TOF, DBS or another PTC measurement is not
possible. This is to avoid erroneous readings due to post tetanic potentiation.

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2.1.2 Response
Before each stimulation, the sequence offset, noise and threshold for the response detection is
measured. Offset is a baseline of the noise measurement. Noise is calculated by the same
algorithm as the response signal itself. The response detection threshold is calculated based on
the noise, and if the response is not greater than the threshold then it is interpreted as no response.

A/D & µP
EMG

Timing control
EMG leads off

Mechano
Sensor
Measurement

Figure 2 Principle of response measurement

EMG measurement
The EMG response is measured as integrated muscle activity. The EMG measurement starts 3 ms
after the stimulation and lasts 15 ms. The 3 ms delay helps to prevent the effect of stimulation
artifact.

Mechano sensor measurement

Response is measured as movement of the thumb, which is the area of positive signal.

2.1.3 Regional block

A regional block cable can be used as a nerve locator in local anesthesia. A maximum current of
5.0 mA is given every, every other or every 3rd second. The response measurement is ocular.

2.2 Main components

2.2.1 NMT board
The NMT Circuit Board consists of the following functional sections:
• constant current stimulator
• measuring electronics for the EMG signals
• microprocessor for the stimulation and measuring control, and for counting the measuring

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results
• serial communication
The serial bus speed is 500 kbps and the bus itself is half duplex, i.e. data can be transferred in
both directions but only one way at a time.

Serial communication

5 kv
Receive data Data
to module prosessor

Send data RS485

Receive data driver NData

to central unit
(module bus)
Send data
Opto isolation Send/receive
Send/receive
Reset Reset in
Reset RS485

serial_comm_opto_isol.vsd
driver NReset in
isolation
Patient

Figure 3 Serial communication and opto isolation

Stimulator
The constant current stimulator generates pulses whose amplitude is independent of the load. The
main components of the stimulator are a transformer, a capacitor and a transistor. The transformer
produces a high voltage which charges the capacitor and the transistor adjusts the pulse width and
amplitude of the current.

Power supply

Current
adjustment 80C196KD
PWM
Constant current
Patient generator HSO
Current
control
NMT_stim_blck_dgrm.vsd

Continuous
stimulation
congestion

Figure 4 Stimulator block diagram

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Table 1 Module bus connector (X1)

Pin No. I/O Signal

1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 - Ground & Shield
8 I -RESET_RS485
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 - Ground & Shield
14 I +32 VDIRTY
15 I GroundDIRTY
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 - ON/STANDBY
21 - PWM_ECG
22 - RXDD_RS232
23 - TXDD_RS232
24 I +5 VDC
25 I +5 VDC

7
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Datex-Ohmeda S/5 monitors

2.3.2 Front panel connector

NMT connector (NMT)

Pin No. Signal

1 EMG Signal +
3 6
2 EMG Signal -
1 9

2
4 7
0
3 Not Used
5 8 4 Stimulus +
5 Stimulus -
6 Ground
7 Not Connected
8 Sensor Identification
9 +5 V
10 Mechanical Signal

8
Document No. 800 1018-4
 NeuroMuscular Transmission Module, M-NMT

3 SERVICE PROCEDURES
3.1 General service information
Field service of the NeuroMuscular Transmission Module, M-NMT, is limited to replacing faulty
circuit boards or mechanical parts. Faulty circuit boards should be returned to Datex-Ohmeda for
repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
The Datex-Ohmeda NMT Stimulator (order code 871251) is recommended for functional checks.

CAUTION Only trained personnel with the appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

9
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Datex-Ohmeda S/5 monitors

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A), which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
NMT simulator 871251
M-NMT ElectroSensor
M-NMT MechanoSensor
M-NMT Sensor Cable
3 kΩ resistor
Screwdriver

• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.

1. Check internal parts:

− screws are tightened properly
− cables are connected properly
− the EMC cover is attached properly
− there are no loose objects inside the module

?
2. Check external parts:
− the front cover and the front panel sticker are intact
− connectors are intact and are attached properly
− the module box, latch and spring locking pin are intact

?
• Refit the module box and check that the latch moves properly.

• Turn the monitor on and wait until the normal monitoring screen appears.

10
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 NeuroMuscular Transmission Module, M-NMT

• Configure the monitor screen so that information regarding the NMT measurement is shown,
for example:

Monitor Setup - Screen 1 Setup - Digit Fields - Field 4 - Nmt

• Preset the NMT measurement settings:

Others - NMT - Stimulus Mode - TOF

Set Cycle Time - 10 sec
NMT Setup - Current - S(70 mA)
Pulse Width - 200 µS
Stim. Beep Volume - 2

3. Plug in the module. Check that it goes in smoothly and locks up properly

?
4. Check that the module is recognized, i.e. the NMT header with related information appear in
the chosen digit field.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding NMT software by selecting SCROLL VERS and turning
the ComWheel.

?
6. Enter the NMT module service menu:

Parameters - NMT

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not increasing
faster than by 5 per second. Check that the module’s memories have passed the internal
memory test, i.e. “RAM”, “ROM” and “EEPROM” all state OK.

?
7. Check the front panel START-UP and STOP/CONTINUE membrane keys.
Press each key for at least one second and check that the key being pressed is identified,
i.e. the color under the corresponding text on the menu turns blue.

11
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Datex-Ohmeda S/5 monitors

8. Check that the message “Cable off” is shown in the digit field and that “Cable” in the service
menu states OFF.

Plug the M-NMT Sensor Cable with the M-NMT ElectroSensor into front panel connector
NMT. Check that the message in the digit field changes to “Measurement OFF” and “Cable”
on the service menu states EMG and ELECTR. OFF.

?
9. Perform the stimulus current test.

Connect a 3 kΩ resistor between the ElectroSensor’s stimulus electrode leads (brown and
white).

Start the test by highlighting START CURR. TEST on the service menu and pressing the
ComWheel. Check that the test was successful with all three test currents, i.e. the “Current
test (mA):” on the menu states 30 OK, 50 OK and 70 OK.

?
• Connect the M-NMT ElectroSensor leads to the NMT simulator. Set the switch on the
simulator to “Fade off” and turn the knob to “max”. Check “Cable” on the service menu now
states only EMG.

10. Start NMT measurement (TOF) by pressing the START-UP key on the module.

When the message “Supramax search” changes to “Setting reference” in the digit field,
check that the supramaximal current detected is less than 70 mA, i.e. the “Current set”
value on the service menu is less than 700.

?
11. Check that the module gives four successive stimulus pulses with 10 second intervals. A
small asterisk (✼) should be shown in the digit field during each of the stimulus pulses and
simultaneous sound signals should be heard from the loudspeaker.

Check that on the service menu the values for “T1%”, “T2%”, “T3%”, “T4%” and “Ratio%”
are all within 950-1059.

Check also that in the digit field the “TOF%” value is within 95-105, “Count” is 4 and “T1%”
is within 95-105.

?
12. Check that the “Noise” value on the service menu stays under 100.

?
13. Change the stimulus pulse width to 100 µs through the NMT service menu:

NMT Setup - Pulse Width - 100 µS

12
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 NeuroMuscular Transmission Module, M-NMT

Check that the “TOF%” value is still within 95-105, “Count” is 4 and “T1%” is within 95-105
in the digit field.

Check the same parameters with a stimulus pulse width of 300 µs.

?
14. Turn the knob on the NMT simulator to “0”.

Check that on the service menu the values for “T1%”, “T2%”, “T3%”, “T4%” turn to 0 and the
“Ratio%” states - - -. In the digit field “TOF%” should also state - - - , and “Count” and “T1%”
should show 0.

Turn the NMT simulator knob back to “max”.

?
15. Change the stimulus mode to Double Burst Stimulation (DBS) through the service menu:

NMT Setup - Stimulus Mode - DBS

Check that the module now gives only two stimulus pulses with a 10 seconds interval.

Check that on the service menu the values for “T1%”, “T2%”, and “Ratio%” are still within
950-1059. In the digit field the “DBS%” value should be within 95-105, “Count” is 2 and
“T1%” is within 95-105.

?
16. Change the stimulus mode to Single Twitch Stimulation (ST):

NMT Setup - Stimulus Mode - ST

Check that the module starts to give only one stimulus pulse with a 1 second interval. Note
the time when the ST stimulation started.

Check that on the service menu the value for “T1%” is within 950-1059. In the digit field the
“Count” value should be 1 and “T1%” within 95-105.
Let the monitor continue to give single twitch stimulation.

?
17. Check that the NMT measurement stops and the message “Measurement OFF” appears in
the digit field for NMT five minutes after the start of the ST stimulation.

?
18. Replace the M-NMT ElectroSensor with the M-NMT MechanoSensor and check that “Cable”
on the service menu states PIEZO.

?
13
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Datex-Ohmeda S/5 monitors

19. Perform an electrical safety check and a leakage current test.

?
20. Check that the module functions normally after performing the electrical safety check.

?
21. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the NeuroMuscular Transmission Module, M-NMT, in the following way. See the
Exploded view of NMT Module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose
latch and spring locking pin.
3. Detach the NMT board by removing the two screws located near the front panel frame,
disconnect the cables and pull out the front panel frame.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected
properly.

14
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 NeuroMuscular Transmission Module, M-NMT

4 TROUBLESHOOTING
4.1 Troubleshooting chart
Trouble Cause Treatment
Check the stimulus electrodes. Loose electrodes or loose stimulus Change or attach the electrodes or
clip. clip.
EMG electrode off.
Supramax. not found. Loose electrodes or loose stimulus Change or attach the electrodes or
clip. clip.
Stimulus electrodes attached to Change the place of the stimulus
wrong place. electrode.
Patient is relaxated.
Response too weak. Loose stimulus electrodes. Change or attach the electrodes.
Measuring electrodes attached to Change the place of the meas.
wrong place. electrodes.
Patient is relaxated.
Ref. not stable. Patient is relaxated.
Movement artifact.

15
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Datex-Ohmeda S/5 monitors

4.2 Troubleshooting flowchart

Possible fault in NMT module

Open NMT Service Menu

Check Timeouts, Bad checksums,

Bad c-s by mod

no Does another module yes Replace NMT board

OK?
work in the same slot?

yes no

Check RAM,ROM,EEPROM Fault not in NMT module

no
Replace NMT board
OK?

yes

Test stimulus current

no no no yes no
Does the test pass with Does the test pass with Are the NMT input board Does the test pass
OK? Replace NMT board
another sensor? another NMT sensor wires connected? with another NMT
yes cable? input board?
yes yes no yes

Replace the original Replace the original

Replace the original sensor NMT sensor cable Connect the connector
NMT input board

Check that sensor is identified

yes
Does the test pass with
OK? Replace the original sensor
another sensor?
no
yes

no

yes
Does the test pass with Replace the original NMT sensor
another NMT sensor cable
cable?

no

yes
Does the test pass with Replace the original NMT input
another NMT input board
board?

no

Replace NMT board

Connect ElectroSensor to NMT
stimulator and start measurement

yes
Does the test pass with Replace the original sensor
Responses OK?
another sensor?
no

yes
no

yes
Does the test pass with Replace the original NMT sensor
another NMT sensor cable
cable

no

yes
Does the test pass with Replace the original NMT input
another NMT input board
board?
no

Replace NMT board

Check front panel key functions

Is the keypad no
OK? Connect the keypad
connected?
no

yes

Does the test pass with yes

another keypad? Replace the original keypad

no

Replace NMT board

Figure 5 Module troubleshooting flowchart

16
Document No. 800 1018-4
 NeuroMuscular Transmission Module, M-NMT

5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters.
5. Select NMT.

17
Document No. 800 1018-3
Datex-Ohmeda S/5 monitors

5.1 NMT menu

Start Curr. test Start Curr. test is a test where the module itself checks the difference between a given current and
the measured current. A 3 kΩ resistance should be connected between the stimulus electrodes
before starting the test. All the currents checked will be displayed on the service data screen. After
the current value, the status of the test is shown. If the test is not passed, send the module back to
the factory for calibration.
T1%/ref T1% / ref gives a selection for changing settings related to the M-NMT MechanoSensor. A setting
of 3 should always be used for normal monitoring. The settings 1 and 2 are for research purposes
only.
Record Data Record Data prints out the displayed service data and circuit board information (id., serial number,
and software id.) onto the Recorder Module, M-REC.
Service Data Cable shows the type of cable being used.
Cable check value shows the bit amount. From the following chart you can check the value for
each cable:
EMG -100...+100
Cable OFF >1950
Piezo 900...1100
Regional block 600....800

Module Keys checks the function of the module keys. A blue background appears at the back of
the text when a key is pressed for more than one second.
Stimulus mode shows the selected stimulus. Stimulus mode can be changed using the NMT Setup
menu.
Measurement indicates ON/OFF.
T1%, T2% shows the measured response. A value of 1000 corresponds to 100%.

18
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 NeuroMuscular Transmission Module, M-NMT

Absolute T1, T2 shows the voltage measured from the A/D converter.
Noise indicates the interference just before the measurement. A typical value is <10.
Offset is an average of the noise measurement. A typical value is 510.
Curr set is the selected current, a value of 700 corresponds to 70 mA.
Curr meas is the measured current, a value of 700 corresponds to 70 mA.
Pulses indicates pulses the module has produced.
Piezo probe T1% and ref. search shows information related to the MechanoSensor settings.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to the monitor has failed.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The non-zero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also, other modules can cause
communication errors that cause these numbers to rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum in the EPROM is in accordance with the software calculated
value.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

19
Document No. 800 1018-3
Datex-Ohmeda S/5 monitors

6 SPARE PARTS
6.1 Spare part list
NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1.1 NMT Module, M-NMT rev. 00, 01, 02

6 7 8 9 10 11 12 13

Figure 6 Exploded view of NMT Module

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel unit, M-NMT 887186
6 Cross cylinder-head screw M3x6 61721
7 Metal frame 879184
8 NMT board, M-NMT (rev.00-01) 887487
9 EMC cover, M-NMT 886320
10 Cross cylinder-head scerw M3x12 628700
11 NMT input board 887184
12 Membrane keypad 880101
13 Front Panel sticker, DA ; M-NMT (rev.00-01) 892217 898846
13 Front Panel sticker, DA ; M-NMT (rev.02) ; S/5 898846
13 Front Panel sticker, DE ; M-NMT (rev.00-01) 886003 898837
13 Front Panel sticker, DE ; M-NMT (rev.02) ; S/5 898837
13 Front Panel sticker, EN ; M-NMT (rev.00-01) 886002 898836
13 Front Panel sticker, EN ; M-NMT (rev.02) ; S/5 898836
13 Front Panel sticker, ES ; M-NMT (rev.00-01) 887498 898840
13 Front Panel sticker, ES ; M-NMT (rev.02) ; S/5 898840
13 Front Panel sticker, FI ; M-NMT (rev.00-01) 888873 898843

20
Document No. 800 1018-4
 NeuroMuscular Transmission Module, M-NMT

Item Description Order No. Replaced by

13 Front Panel sticker, FI ; M-NMT (rev.02) ; S/5 898843
13 Front Panel sticker, FR ; M-NMT (rev.00-01) 886004 898838
13 Front Panel sticker, FR ; M-NMT (rev.02) ; S/5 898838
13 Front Panel sticker, IT ; M-NMT (rev.00-01) 887542 898841
13 Front Panel sticker, IT ; M-NMT (rev.02) ; S/5 898841
13 Front Panel sticker, JA ; M-NMT (rev.00-01) 888318 8000383
13 Front Panel sticker, JA ; M-NMT (rev.02) ; S/5 8000383
13 Front Panel sticker, NL ; M-NMT (rev.00-01) 887370 898839
13 Front Panel sticker, NL ; M-NMT (rev.02) ; S/5 898839
13 Front Panel sticker, NO ; M-NMT (rev.00-01) 893572 898845
13 Front Panel sticker, NO ; M-NMT (rev.02) ; S/5 898845
13 Front Panel sticker, PT ; M-NMT (rev.00-01) 895240 898842
13 Front Panel sticker, PT ; M-NMT (rev.02) ; S/5 898842
13 Front Panel sticker, SV ; M-NMT (rev.00-01) 887369 898844
13 Front Panel sticker, SV ; M-NMT (rev.02) ; S/5 898844

21
Document No. 800 1018-3
Datex-Ohmeda S/5 monitors

7 EARLIER REVISIONS
This manual also supports earlier module revision 00.

22
Document No. 800 1018-4
APPENDIX A, Service Check Form, M-NMT

APPENDIX A

23
Document No. 800 1018-3
Datex-Ohmeda S/5 monitors

24
Document No. 800 1018-4
 APPENDIX A, Service Check Form, M-NMT

SERVICE CHECK FORM

NeuroMuscular Transmission Module, M-NMT

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation 4. Recognition

5. Module software NMT

6. Communication and 7. Membrane keys
memories
8. ElectroSensor 9. Stimulus current test
recognition

10. Supramaximal current < 70 mA

11. TOF measurement with NMT simulator

T1% 950-1059
T2% 950-1059
T3% 950-1059
T4% 950-1059
Ratio% 950-1059
TOF% 95-105
Count 4
T1% 95-105
12. Noise < 100

A-1(2)
Document No. 800 1018-4
Datex-Ohmeda S/5 monitors

13. Stimulus pulse width

100 µs 300 µs Allowed range
TOF% 95-105
Count 4
T1% 95-105
OK N.A. Fail
14. No response

15. DBS measurement with NMT simulator

T1% 950-1059
T2% 950-1059
Ratio% 950-1059
DBS% 95-105
Count 2
T1% 95-105

16. ST measurement with NMT simulator

T1% 950-1059
Count 1
T1% 95-105

17. Automatic measurement off 18. MechanoSensor

recognition
19. Electrical safety check 20. Functioning after
electrical safety
check
21. Final cleaning

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 800 1018-4
 Datex-Ohmeda
Anesthesia record keeping keyboard, K-ARKB (rev. 00)
S/5TM Keyboard Interface Board, B-ARK (rev. 00)
Barcode reader, N-SCAN (rev. 00)

Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8003840-1

April 2002

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
mailto:product.support.ussub@us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
www.us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Anesthesia record keeping keyboard, K-ARKB,
S/5 Keyboard Interface Board, B-ARK and Barcode reader, N-SCAN
TABLE OF CONTENTS I
TABLE OF FIGURES II
INTRODUCTION 1
1 SPECIFICATIONS 3
1.1 General specifications ..............................................................................................................................3
1.1.1 Keyboard, K-ARKB............................................................................................................................3
1.1.2 Barcode reader, N-SCAN ..................................................................................................................3
2 FUNCTIONAL DESCRIPTION 4
2.1 Introduction..............................................................................................................................................4
2.2 Anesthesia record keeping keyboard, K-ARKB............................................................................................4
2.2.1 Controller Board ...............................................................................................................................4
2.2.2 Alpha-numeric keyboard...................................................................................................................5
2.2.3 Membrane keyboard ........................................................................................................................5
2.3 Keyboard Interface Board, B-ARK ..............................................................................................................5
2.4 Barcode reader, N-SCAN...........................................................................................................................5
2.5 Connectors and signals.............................................................................................................................6
3 SERVICE PROCEDURES 8
3.1 General service information.......................................................................................................................8
3.2 Service check ...........................................................................................................................................9
3.2.1 Recommended tools ........................................................................................................................9
3.3 Disassembly and reassembly..................................................................................................................11
4 TROUBLESHOOTING 12
4.1 Troubleshooting charts............................................................................................................................12
4.1.1 Anesthesia record keeping keyboard, K-ARKB .................................................................................12
4.1.2 Barcode reader ..............................................................................................................................13
5 SERVICE MENU 14
5.1 Keyboard menu ......................................................................................................................................15
5.1.1 Keyboard Log .................................................................................................................................16
5.1.2 Keyboard Type ...............................................................................................................................16
6 SPARE PARTS LIST 17
6.1 Spare parts list .......................................................................................................................................17
6.1.1 Anesthesia Keyboard, K-ARK rev. 00, 01, 02 ...................................................................................17
6.1.2 Anesthesia record keeping keyboard, K-ARKB rev. 00 ......................................................................19
6.1.3 Front panel stickers for K-ARKB .......................................................................................................20
6.1.4 Keyboard Interface Board, B-ARK....................................................................................................21
7 EARLIER REVISIONS 22
APPENDIX A 23

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Document No. 8003840-1
Datex-Ohmeda S/5 monitors

SERVICE CHECK FORM A-1

TABLE OF FIGURES
Figure 1 Anesthesia record keeping keyboard, K-ARKB (English version) ..............................................................1
Figure 2 Exploded view of the K-ARK keyboard..................................................................................................17
Figure 3 Exploded view of the K-ARKB keyboard ...............................................................................................19
Figure 4 K-ARKB S/5 front panel stickers .........................................................................................................20

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Document No. 8003840-1
 Anesthesia record keeping keyboard and Barcode Reader

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
anesthesia record keeping keyboard, K-ARKB, the S/5 Keyboard Interface Board, B-ARK and the
barcode reader, N-SCAN. The information is applicable for the current production revisions of the
devices. Later in this manual modules may be refered to without the S/5 system nomenclature for
simplicity..
Please refer to theTechnical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.

Silence Take Alarms Record/ Invasive Normal

Freeze Snapshot ECG NIBP
Alarms Setup Print Pressures Screen

2
Help Reset Trends Monitor Patient Pulse Airway
Setup Oximetry Others
Case Data Gas

Display & Gases List

Patient Fluids Analg. Relaxants Cardiacs Events Modify Print
Record Ventilat.
3
Lab. Local& Drugs End of
Cancel Personnel Regional Antibiot. Hypnotics Antagon Comments Special
Data Other Case

# ( )
Q 7
-
W E R T Y U I O P Backspace 8 9
Drugs
.
. " * %
+
4 A S D F G H J K L \
' 4 5 6
5
< > ´ `

<
?
, . / 1 2 3
Z X C V B N M
Shift Events
Enter
¨ Del
Shift
PgUp PgDn SPACE/SEARCH 0 .

Figure 1 Anesthesia record keeping keyboard, K-ARKB (English version)

(1) The ComWheel

(2) Keys that function as the S/5 monitor’s command bar. The power switch is in the monitor’s
Command Bar.
(3) Keys for record keeping control.
(4) Letter and number keys for typing in information that is not listed in the menus.
(5) Arrow keys (Drugs, Events) for moving up or down the Event list and Event trend when the
record is on the display.
NOTE: The S/5 Keyboard Interface Board, B-ARK can only be used with S/5 Anesthesia Monitor
and AS/3 Anesthesia Monitor.
NOTE: The K-ARK and K-ARKB keyboards are compatible with monitor software versions:
S-ARK94 and later, L-ARK99(A), L-00A03/04, L-00A07/08 and L-ANE01(A) and later

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Document No. 8003840-1
Datex-Ohmeda S/5 monitors

Related documents
For more information about... See
Technical issues Technical Reference Manual of the Monitor, Part I
Configuration Anesthesia Record Keeping Solution, user documentation
Contents of the menus in your hospital Contact the personnel responsible for the menu configurations in
the hospital
Monitor, parameters, physiological trends, Datex-Ohmeda S/5 Anesthesia Monitor, User’s Guide and User’s
general messages and symbols on the display Reference Manual
Printer The printer manual
Barcode reader The barcode reader manual

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Document No. 8003840-1
 Anesthesia record keeping keyboard and Barcode Reader

1 SPECIFICATIONS

1.1 General specifications

1.1.1 Keyboard, K-ARKB

Dimensions (W × D × H) 328 × 232 × 61 mm/12.9 × 9.1 × 2.4 in
Weight 1.3 kg/3.8 lbs.
Power +5 V DC ±10 %, 70 mA max, supplied from S/5 AM or S/5 CM
Character set ASCII
Communication interface PC compatible serial line plus S/5 type serial line
Environmental requirements:
Operating temperature +10...+35 °C/+50...+95 °F
Storage temperature -10...+45 °C/+14...+113 °F
Humidity 10...90 % non-condensing

1.1.2 Barcode reader, N-SCAN

Dimensions (W × L × H) 7.1 × 12.7 × 16 cm/2.8 × 5 ×6.3 in
Weight approx. 170 g/5.98 oz. (w/o cable)
Power supplied from S/5 monitor or AS/3 AM or AS/3 CM
Light source 675 nm laser diode
Laser classifications CDRH Class II, IEC Class 1, IEC 825 Class 2
Environmental requirements:
Operating temperature 0...+40 °C/+32...+104 °F
Storage temperature -40...+60 °C/-40...+140 °F
Humidity 5...95 % non-condensing
Durability withstands 1.2 m drop to concrete

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Document No. 8003840-1
Datex-Ohmeda S/5 monitors

2 FUNCTIONAL DESCRIPTION

2.1 Introduction
Anesthesia Record Keeping Solution is an automated anesthesia documentation system. For the
Anesthesia Record Keeping Solution, the record keeping configurations from the network and a
memory module, and optionally the keyboard, K-ARKB is needed.
The anesthesia Record Keeping Solution is connected to the network, and runs in the S/5 AM or
S/5 CM. Memory Module, M-MEM (N-CMMEM) is needed for backup data storage.
The anesthesia Record Keeping Solution combines the physiological data measured by the
monitor, information automatically integrated from external devices such as the S/5 ADU, and the
information entered manually using the menus into a printable anesthesia record. The record can
be stored in electronic format for later review/printing and for statistical analysis.

2.2 Anesthesia record keeping keyboard, K-ARKB

The anesthesia record keeping keyboard, K-ARKB, consists of the controller board, alphanumeric
keyboard and membrane keyboard.

2.2.1 Controller Board

The controller board reads the status of the keyboard keys and the ComWheel, and forwards the
information to the CPU board, in the monitor through an RS232 serial interface.
Additionally, the board controls the LEDs on the K-ARKB front panel.

External communication
Communication with the CPU board, takes place in the RS232 serial communication channel
which is available on the CPU bus. There are also two bidirectional signals (Data and Clock) for
PCKB format communication.
For serial communication, the anesthesia record keeping keyboard is connected to the S/5
Anesthesia Monitor 8-Module Frame by 9-pin-26-pin interface cable. The cable is connected to
Keyboard Interface Board, B-ARK or to Display Controller board, B-DISP (or B-DHIGH), in the F-
CU8.
In case of PCKB type communication, the Keyboard can be connected to the S/5 LCD Display, D-
LCC10A or to the S/5 CM.

CPU
The CPU on the controller board is of a type 80C51FA and the oscillator frequency is 11.059 Mhz.
There is a power-up-reset whose time constant is about 1 second.
Serial communication
The RS232 serial communication IC needs only +5 V supply voltage because it chops the
necessary RS-level supply voltages to its external capacitors. A diode allows the use of two
keyboards, and a pull-down resistor on the CPU board is used for pulling the corresponding line to
the negative RS-level. The speed rate of the serial communication is 19.2 kbps.

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LEDs
The CPU on the controller board controls the alarm LEDs according to commands received from the
main CPU board.

2.2.2 Alpha-numeric keyboard

The controller board reads the status of the keys on the alphanumeric keyboard. The boards are
connected together with a 26-pin ribbon cable.

2.2.3 Membrane keyboard

The controller board reads the status of the keys on the membrane keyboards. The membrane
keyboard and the controller board are connected together with a ribbon cable.

2.3 Keyboard Interface Board, B-ARK

The Keyboard Interface Board, B-ARK is installed in the 8-Module Frame of the S/5 Anesthesia
Monitor. It has a 26-pin D-connector to which the anesthesia record keeping keyboard, K-ARKB is
connected. The board passes the keyboard signals to the F-CU8.

2.4 Barcode reader, N-SCAN

The barcode reader, N-SCAN is an optional device to make record keeping faster by using bar
codes. With the barcode reader the user has direct access to a menu item by reading a bar code
mapped to the menu item. Barcodes can also be used for pushing and turning the ComWheel and
opening the main menus (L-ARK99(A) or later).

WARNING When using the barcode reader, N-SCAN, do not stare into beam. The barcode
reader, N-SCAN is a Class 2 laser product.

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2.5 Connectors and signals

Bar Code Reader 5-pin connector on the anesthesia record keeping keyboard, K-ARKB
Pin No Signal
1 PC-CLOCK
2 PC-DATA
3 N.C.
4 GND
5 +5 V

Anesthesia record keeping keyboard 9-pin connector on the anesthesia record keeping
keyboard, K-ARKB

1 5

6 9

Pin No I/O Signal

1 I/O PC-DATA
2 I RX
3 O TX
4 I +5 V
5 GND
6 I RESET
7 - GND
8 - N.C.
9 I/O PC-CLOCK

The connector located on the Keyboard Interface Board, B-ARK

9 1
18 10
26 19

Pin No I/O Signal

1 N/C
2 N/C
3 N/C
4 N/C
5 N/C
6 O Ground
7 N/C
8 N/C
9 N/C
10 N/C
11 N/C
12 N/C
13 N/C
14 N/C

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Pin No I/O Signal

15 O +5V
16 N/C
17 N/C
18 N/C
19 I RxD RS232
20 O TxD RS232
21 N/C
22 N/C
23 N/C
24 N/C
25 N/C
26 N/C

The CPU bus connector (X1)

Pin No a b c
1 +15 V AGND DGND
2 -15 V BALE DGND
3 SA0 SA1 DGND
4 SA2 SA3 RESET_RS485
5 SA4 SA5 -RESET_RS485
6 SA6 SA7 DATA_RS485
7 SA8 SA9 -DATA_RS485
8 SA10 SA11 TXDD_RS232
9 SA12 SA13 RXDD_RS232
10 SA14 SA15 BIT0IN
11 SA16 SA17 BIT1IN
12 SA18 SA19 TXDC
13 SA20 SA21 RXDC
14 SA22 SA23 RTSC
15 -SMEMR -SMEMW CTSC
16 -IOR -IOW TXDB
17 CLK -RESET RXDB
18 -IOCHRDY IRQ10 RTSB
19 N/C_1 IRQ11 CTSB
20 N/C_2 IRQ12 TXDA
21 -SBHE IRQ15 RXDA
22 SD0 SD1 RTSA
23 SD2 SD3 CTSA
24 SD4 SD5 LOUDSPEAKER
25 SD6 SD7 +5 V
26 SD8 SD9 +5 V
27 SD10 SD11 +5 V
28 SD12 SD13 +5 V
29 SD14 SD15 ON/STBY
30 +15 VD -RESET_CPU +5 V_CPU
31 +15 VD +32 VD REFRESH_WD
32 GNDD GNDD POWER_FAIL

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the K-ARKB Keyboard is limited to replacing faulty circuit boards or mechanical
parts. The circuit boards should be then returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

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3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
B-ARK with AM
Screwdriver

1. Disconnect the interface cable from the anesthesia record keeping keyboard, K-ARKB and
check the cable:
− the connector pins are clean and straight and at about the same height
− the locking screws are intact
− the cable is intact
Leave the cable disconnected.

?
2. Detach the bottom cover and check internal parts:
− all screws are tightened properly
− the block screws for the interface cable are in place and are tightened properly
− the block screw threads are intact
− the interface cable connector is clean and intact
− all internal cables are connected properly
− all IC’s that are on sockets are attached properly
− there are no loose objects inside
Reattach the bottom cover, reconnect and lock the interface cable to the anesthesia record
keeping keyboard, K-ARKB.

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3. Check external parts:

− the anesthesia record keeping keyboard, K-ARKB plastic frame is intact
− the front panel stickers are intact
− the ComWheel cover is intact and is attached properly
− all four rubber pads are in place on the bottom cover

?
• Install the B-ARK into the Central Unit. Connect and lock the interface cable to the B-ARK
rear panel connector.

4. Switch the monitor on. Check that the LED on the upper right hand corner of the anesthesia
record keeping keyboard, K-ARKB is lit up.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding anesthesia record keeping keyboard, K-ARKB
software.

?
6. Select the menu Keyboard with the ComWheel.
Highlight the text Upper Led. Check that the red alarm LED is turning on and off on the
anesthesia record keeping keyboardwhen pressing the ComWheel. Check also the yellow
alarm LED by selecting Lower Led from the menu.

?
7. Check the ComWheel.

Turn the ComWheel clockwise and counterclockwise and check that each step generates a
sound from the loudspeaker and the corresponding values at the bottom of the menu
increase.

Select Dummy Press. Press the ComWheel and check that the press generates a sound and
the corresponding value in the menu increases.

?
8. Check the anesthesia record keeping keyboard, K-ARKB membrane keys.

Press the keys on the upper part of the anesthesia record keeping keyboard one by one.
Check that each key generates a sound from the loudspeaker and the corresponding text in
the menu changes from yellow to red.

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Press the keys on the lower part, all except the keys Modify and Print. Check that each key
generates a sound from the loudspeaker, or at least the ‘Message count’ value increases in
the service menu.

Press the keys Modify and Print and check that the corresponding menus open onto the
screen.

?
9. Perform electrical safety check and leakage current test.

?
10. Check that the anesthesia record keeping keyboard functions normally after the performed
electrical safety check.

?
11. Clean the anesthesia record keeping keyboard with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

The anesthesia record keeping keyboard, K-ARKB is disassembled in the following way. See the
Exploded view of the K-ARKB keyboard.
1. Disconnect the anesthesia record keeping keyboard - monitor cable ( keyboard - LCD
display cable).
2. Remove four screws from the bottom of the keyboard, and detach the cover plate from the
bottom plate.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

4.1.1 Anesthesia record keeping keyboard, K-ARKB

Problem Cause Treatment
Keys have not effect on the display. Cable is not connected or broken. Connect right type of cable properly (see above).
Wrong type of cable is connected.

Loose connector inside. Detach the bottom plate and check connectors
Component failure inside. and components.
Membrane key not working. Ribbon cable loose or broken. Keyboard cable Check the items. Replace them if necessary.
loose or broken. D-connector pin failure. IC
failure on the Controller board. RS232
communication failure on the main CPU board.
NOTE: The cancel key does not respond if the
menu is closed.
The modify key may not work if there is no
selection.
Led does not light at alarm or stays Cable loose or broken. LED broken. Check the items. Replace them if necessary.
lit after alarm is over. Component failure on the Controller board.
See more troubleshooting items on User’s Reference Manual.

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4.1.2 Barcode reader

Problem Cause Treatment
Barcode reader does not give a beep Beep sound is OFF. Contact personnel responsible for installing and
sound configuring the monitors. Bar Code Beep should be
ON in Monitor Setup - Install/Service - Installation -
Monitor Settings menu. Password is required for the
selection.
Nothing happens when trying to use Cable connections are not properly Confirm that the cables are properly connected.
the barcode reader. connected.
Barcode reader opens a Search menu Menu directory does not have a barcode Contact personnel responsible for installing and
but nothing else happens. reader file. configuring the monitors.
Barcode reader led flashes and you 1. Barcodes are not included in the 1. Contact personnel responsible for installing and
may hear a beep sound, but nothing configuration. configuring the monitors.
else happens.
2. Barcode reader is not correctly 2. Contact personnel responsible for installing and
programmed. configuring the monitors. The barcode reader
should be reprogrammed. See the instructions
3. Monitor is not connected to the
following the barcode reader.
network and the memory module
does not have a menu card inside. 3. Connect the monitor to the network or insert a
menu card into the memory module.
4. Monitor has an old configuration
which is not updated. 4. Contact personnel responsible for installing and
configuring the monitors.
5. Old software version on monitor.
5. Please upgrade your monitor.

NOTE: Possible connecting cables are

881152 and Y-piece or 8001117.
Search result seems to mix different Menu files have been modified after Contact personnel responsible for installing and
menu items. which they have not been recompiled configuring the monitors. The menu files have to be
with the map files. recompiled together with the map files.
See more troubleshooting items on Barcode reader manual.

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5 SERVICE MENU

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).

3. Select Service (password 26-23-8).

4. Select Keyboard.

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5.1 Keyboard menu

A service menu for testing the command board functions and for setting the K-ARKB type.
NOTE: All counters are automatically zeroed on returning to the previous menu.

Upper Led is for testing the upper alarm LED (red) on the
command board. When the text is highlighted, the upper
alarm LED can be turned on and off by pressing the
ComWheel.
Lower Led is for testing the lower alarm LED (yellow) on
the command board. When the text is highlighted, the
lower alarm LED can be turned on and off by pressing the
ComWheel.
Dummy Press is for testing the ComWheel. When the text
is highlighted, pressing of the ComWheel create a sound
from the loudspeaker and the corresponding number on
the service data field increase.

Service Data
Message count counts the number of messages that are
sent out to the main CPU board.
Leds upper and lower indicate the states of the alarm
LEDs on the command board.
Direct action keys texts are indications to the command
board membrane keys. When a key on the command
board is pressed, the corresponding text in the menu
changes its colour.
Control wheel, Press counts the ComWheel pressings.
Control wheel, Clockwise and Counterclockwise the
ComWheel turnings.
Since shows the date and the time of the last run time
reset.

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5.1.1 Keyboard Log

All the keyboard presses and the commands given by the
ComWheel are recorded in the Keyboard Log. The
keyboard log is saved in the permanent memory of the
monitor. The length of the log is 1150 events. The log is
FIFO type.

5.1.2 Keyboard Type

Store Mask A selection for setting the anesthesia record
keeping keyboard’s language. The selected language
determines the outcome of the lower keypad.
Store Type is for setting the keyboard’s type;
COM = Command Board
ARK = Anesthesia record keeping keyboard
IC = Information Center Keyboard
NOTE: The settings should be checked if the
controller board is replaced. If settings are
changed, the new settings will not be valid until
the next start-up.

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6 SPARE PARTS LIST

6.1 Spare parts list

6.1.1 Anesthesia Keyboard, K-ARK rev. 00, 01, 02

Figure 2 Exploded view of the K-ARK keyboard

Item Description Order No. Replaced by

1 Sticker-pad,diam 16,height 8 65142
2 Alpha-numeric Keyboard PC-board, K-ARK (rev.00-01), K-CENTRALB 884178
3 Command board PCB, K-ARK (rev.01-02) 893944
3 Controller board, K-ARK (rev.00), K-CENTRALB 884177
4 Rotary wheel 879872
5 ComWheel cover and spring 879191
6 Cross cylinder-head screw M3x6 61721
7 Lower Front Panel sticker, IT ; K-ARK (rev.02) 893608
7 Lower Front Panel sticker, SCA ; K-ARK (rev.00-01) 884632 893807
7 Lower Front Panel sticker, DA ; K-ARK (rev.02) 893611
7 Lower Front Panel sticker, DE ; K-ARK (rev.00-01) 885133 893604
7 Lower Front Panel sticker, DE ; K-ARK (rev.02) 893604
7 Lower Front Panel sticker, EN ; K-ARK (rev.00-01) 884017 893603
7 Lower Front Panel sticker, EN ; K-ARK (rev.02) 893603
7 Lower Front Panel sticker, ES ; K-ARK (rev.00-01) 886198 893607
7 Lower Front Panel sticker, ES ; K-ARK (rev.02) 893607

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Item Description Order No. Replaced by

7 Lower Front Panel sticker, FI ; K-ARK (rev.00-01) 888862 893609
7 Lower Front Panel sticker, FI ; K-ARK (rev.02) 893609
7 Lower Front Panel sticker, FLE ; K-ARK (rev.00-01) 886161 893114
7 Lower Front Panel sticker, FLE ; K-ARK (rev.02) 893114
7 Lower Front Panel sticker, FR ; K-ARK (rev.00-01) 884406 893605
7 Lower Front Panel sticker, FR ; K-ARK (rev.02) 893605
7 Lower Front Panel sticker, IT ; K-ARK (rev.00-01) 886911 893608
7 Lower Front Panel sticker, NL ; K-ARK (rev.00-01) 886282 893606
7 Lower Front Panel sticker, NL ; K-ARK (rev.00-01) 892200 893611
7 Lower Front Panel sticker, NL ; K-ARK (rev.02) 893606
7 Lower Front Panel sticker, NO ; K-ARK (rev.02) 893552
7 Lower Front Panel sticker, PT ; K-ARK (rev02) 895261
7 Lower Front Panel sticker, SCA ; K-ARK (rev.02) 893807
7 Lower Front Panel sticker, SV ; K-ARK (rev.00-01) 885916 893610
7 Lower Front Panel sticker, SV ; K-ARK (rev.02) 893610
8 Membrane keypad, lower, K-ARK 879964
9 Upper Fron Panel sticker, ES ; K-ARK (rev.01) 892329 893598
9 Upper Fron Panel sticker, FI ; K-ARK (rev.01) 892331 893600
9 Upper Front Panel sticker, DE ; K-ARK (rev.01) 892326 893595
9 Upper Front Panel sticker, , ES ; K-ARK (rev.00) 886200
9 Upper Front Panel sticker, FR ; K-ARK (rev.00) 884731
9 Upper Front Panel sticker, FR ; K-ARK (rev.01) 892327 893596
9 Upper Front Panel sticker, DA ; K-ARK (rev.01) 892199 893602
9 Upper Front Panel sticker, DA ; K-ARK (rev.01) 892199 893602
9 Upper Front Panel sticker, DA ; K-ARK (rev.02) 893602
9 Upper Front Panel sticker, DE ; K-ARK (rev.00) 885140
9 Upper Front Panel sticker, DE ; K-ARK (rev.02) 893595
9 Upper Front Panel sticker, EN, SCA ; K-ARK (rev.00) 881648
9 Upper Front Panel sticker, EN, SCA ; K-ARK (rev.01) 892350 893594
9 Upper Front Panel sticker, EN, SCA ; K-ARK (rev.02) 893594
9 Upper Front Panel sticker, ES ; K-ARK (rev.02) 893598
9 Upper Front Panel sticker, FI ; K-ARK (rev.00) 888861
9 Upper Front Panel sticker, FI ; K-ARK (rev.02) 893600
9 Upper Front Panel sticker, FR ; K-ARK (rev.02) 893596
9 Upper Front Panel sticker, IT ; K-ARK (rev.00) 886910
9 Upper Front Panel sticker, IT ; K-ARK (rev.01) 892330 893599
9 Upper Front Panel sticker, IT ; K-ARK (rev.02) 893599
9 Upper Front Panel sticker, NL, FLE ; K-ARK (rev.00) 886162
9 Upper Front Panel sticker, NL, FLE ; K-ARK (rev.00) 886162
9 Upper Front Panel sticker, NL, FLE ; K-ARK (rev.01) 892328 893597
9 Upper Front Panel sticker, NL, FLE ; K-ARK (rev.01) 892328 893597
9 Upper Front Panel sticker, NL, FLE ; K-ARK (rev.02) 893597
9 Upper Front Panel sticker, NO ; K-ARK (rev.02) 893551
9 Upper Front Panel sticker, PT ; K-ARK (rev.02) 895260
9 Upper Front Panel sticker, SV ; K-ARK (rev.00) 885915
9 Upper Front Panel sticker, SV ; K-ARK (rev.01) 892332 893601
9 Upper Front Panel sticker, SV ; K-ARK (rev.02) 893601
10 Membrane keypad, K-VHC14 879373

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6.1.2 Anesthesia record keeping keyboard, K-ARKB rev. 00

Figure 3 Exploded view of the K-ARKB keyboard

Item Description Order No. Replaced by

1 ComWheel ; S/5 898794
2 Membrane keypad, lower, K-ARKB ; S/5 8000006
3 Alpha-numeric Keyboard PC-board, K-ARK (rev.00-01), K-CENTRALB 884178
4 Cross cylinder-head screw M3x6 61721
4 Cross cylinder-head screw M3x6 61721
4 Cross cylinder-head screw M3x6 61721
5 Bottom plate, K-ARKB ; S/5 898392
6 Sticker-pad,diam 16,height 8 65142
7 Membrane keypad, K-ARKB ; S/5 8000050
8 Keyboard casing, K-ARKB ; S/5 898391
9 Command bar board, K-ARKB ; S/5 8000054
10 Opto-encoder, rotary switch,16-positions,push button, metall shaft, 4inch ribbon cable and 113291

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Item Description Order No. Replaced by

connector
11 Shakeproof washer m3.2 63611
12 Emc plate, K-ARKB ; S/5 8000960
13 Output connector cable, K-ARKB ; S/5 8000098
14 D-female screwlock 640624
15 Connection cable PC-KB, K-ARKB ;S/5 8000097

6.1.3 Front panel stickers for K-ARKB

Figure 4 K-ARKB S/5 front panel stickers

Item Description Order No. Replaced by

1 Keyboard casing, K-ARKB ; S/5 898391
2 Upper Front Panel sticker, DA ; K-ARKB (rev.00) ; S/5 898369
2 Upper Front Panel sticker, DE ; K-ARKB (rev.00) ; S/5 898378
2 Upper Front Panel sticker, EN ; K-ARKB (rev.00) ; S/5 898368
2 Upper Front Panel sticker, EN ; K-ARKB (rev.00) ; S/5 898368
2 Upper Front Panel sticker, ES ; K-ARKB (rev.00) ; S/5 898372
2 Upper Front Panel sticker, FI ; K-ARKB (rev.00) ; S/5 898375
2 Upper Front Panel sticker, FR ; K-ARKB (rev.00) ; S/5 898370
2 Upper Front Panel sticker, IT ; K-ARKB (rev.00) ; S/5 898373
2 Upper Front Panel sticker, JA ; K-ARKB (rev.00) ; S/5 8000373

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Item Description Order No. Replaced by

2 Upper Front Panel sticker, NL ; K-ARKB (rev.00) ; S/5 898371
2 Upper Front Panel sticker, NL ; K-ARKB (rev.00) ; S/5 898371
2 Upper Front Panel sticker, NO ; K-ARKB (rev.00) ; S/5 898377
2 Upper Front Panel sticker, PT ; K-ARKB (rev.00) ; S/5 898374
2 Upper Front Panel sticker, SV ; K-ARKB (rev.00) ; S/5 898376
3 Front Panel sticker, lower, BE, NL ; K-ARKB ; S/5 898797
3 Front Panel sticker, lower, DA ; K-ARKB (rev.00) ; S/5 898390
3 Front Panel sticker, lower, DE ; K-ARKB (rev.00) ; S/5 898381
3 Front Panel sticker, lower, EN ; K-ARKB (rev.00) ; S/5 898380
3 Front Panel sticker, lower, ES ; K-ARKB (rev.00) ; S/5 898384
3 Front Panel sticker, lower, FI ; K-ARKB (rev.00) ; S/5 898387
3 Front Panel sticker, lower, FR ; K-ARKB (rev.00) ; S/5 898382
3 Front Panel sticker, lower, IT ; K-ARKB (rev.00) ; S/5 898385
3 Front Panel sticker, lower, JA ; K-ARKB (00) ; S/5 8000374
3 Front Panel sticker, lower, NL ; K-ARKB (rev.00) ; S/5 898383
3 Front Panel sticker, lower, NO ; K-ARKB (rev.00) ; S/5 898389
3 Front Panel sticker, lower, PT ; K-ARKB (rev.00) ; S/5 898386
3 Front Panel sticker, lower, SKAND ; K-ARKB ; S/5 898796
3 Front Panel sticker, lower, SV ; K-ARKB (rev.00) ; S/5 898388

6.1.4 Keyboard Interface Board, B-ARK

Item Item description Order No.
Grounding plate, blank/narrow 885198
Block screw for cables 546096

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7 EARLIER REVISIONS
Information of Anesthesia Keyboard , K-ARK rev. 00 see service manual 885 941.
Information of Anesthesia Keyboard, K-ARK rev. 02 see tech. reference manual 896 624.

Previous Bar Code Reader (by HP) rev. 00 see Technical Reference Manual 895 585.

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APPENDIX A

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SERVICE CHECK FORM

Anesthesia record keeping keyboard, K-ARKB

Customer

Service Keyboard type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Cable 2. Internal parts

3. External parts 4. ON -LED

5. Software KB
6. Alarm LEDs 7. ComWheel

8. Membrane keys

Notes

9. Electrical safety check 10. Functioning after

electrical safety
check
11. Final cleaning

Notes

Used Spare Parts

Signature

A-1(1)
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Document No. 8003840-1

 Datex-Ohmeda
S/5™ Memory Module, M-MEM (Rev. 06)

Technical Reference Manual

All specifications are subject to change without notice.

Document No. 8001020-5

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
mailto:product.support.ussub@us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
www.us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Memory Module, M-MEM (Rev. 04)
TABLE OF CONTENTS i
Introduction 1
1 Specifications 2
1.1 General specifications ..........................................................................................................................2
1.1.1 M-MEM........................................................................................................................................2
1.2 Technical specifications........................................................................................................................2
2 Functional Description 3
2.1 Memory Module, M-MEM......................................................................................................................3
2.1.1 Memory board..............................................................................................................................3
2.1.2 LED board....................................................................................................................................5
3 Service Procedures 9
3.1 General service information ..................................................................................................................9
3.2 Service check.......................................................................................................................................9
3.2.1 Recommended tools ....................................................................................................................9
3.3 Disassembly and reassembly..............................................................................................................13
4 Troubleshooting 14
4.1 Troubleshooting charts........................................................................................................................14
4.1.1 Memory Module .........................................................................................................................14
4.1.2 Memory cards ............................................................................................................................14
5 Service Menu 15
5.1 MemCards Status menu .....................................................................................................................16
5.2 Communication..................................................................................................................................17
6 Spare Parts 18
6.1 Spare parts list ...................................................................................................................................18
6.1.1 Memory Module, M-MEM Rev. 00, 01, 02, 03 .............................................................................18
6.1.2 Memory Cards............................................................................................................................19
7 Earlier Revisions 20
APPENDIX A 21
Service check FORM A-1

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 MEM Module, M-MEM. The Memory Module, M-MEM is an optional data
storage single width module designed for S/5 monitors. Later in this manual modules may be
refered to without the S/5 system nomenclature for simplicity.
Please also refer to theTechnical Reference Manual of the S/5 monitor for system specific
information e.g. related documentation, conventions used, symbols on equipment, safety
precautions, system description, system installation, interfacing, functional check and planned
maintenance.
The Memory Module is used for storing patient related physiological data, discrete record keeping
events, menu configurations and user defined monitor configurations in removable PCMCIA1
compatible memory cards.
The memory module can be utilized in the following applications:
• As a backup media for patient related physiological and record keeping data.
• As a local menu server for the monitor it is attached to.
• A memory card with its previously recorded patient data can be transported to a new
monitor location with the patient, enabling continuous data collection.
• To save and load user defined monitor configurations.
The memory module is available in one version:
• Single width external plug-in Memory Module, M-MEM for S/5 Critical Care and Anesthesia
monitors.
The memory module has two card slots, which use rewritable PCMCIA-ATA specification
compatible memory cards: Data and Menu Cards.
The data card is used for storing patient related data and record keeping events, and the menu
card is used as a storage media for pre-recorded menu configurations and user defined monitor
configurations. If the module is used only for data backup and transportation, the Menu card is not
necessarily required. Similarly, if only record keeping configurations are needed, The data card
does not have to be present. In the latter case, however, no physiological or event data can be
stored in a memory card.
2 3
Module software runs under MS-DOS compatible operating system provided by Datalight . The
files created in Data and Menu MemCards are MS-DOS compatible.
1
PCMCIA = Personal Computer Memory Card International Association
2
MS-DOS is a trademark of Microsoft Corporation
3
Datalight is a trademark of Datalight, Inc.

The communication between the monitor CPU and the memory module is performed with a high-
speed internal TTL level RS-232 serial interface. Data transfer rate is 76.8 kbps.

Compatibility

NOTE: Memory Module,M-MEM, cannot be used in the Extension Frame,F-EXT4 and in the
S/5 Compact Monitors.

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1 SPECIFICATIONS

1.1 General specifications

1.1.1 M-MEM
Module size (W × D × H) 37 × 180 × 112 mm/1.5 × 7.1 × 4.4 in
Module weight 0.4 kg/1.0 lbs
Total power consumption 2 W maximum

1.2 Technical specifications

MemCard capacity 32 MB
Data storage capacity 2 days of continuous physiological data trends

Operating system Datalight ROM-DOS

File system MS-DOS compatible
MemCards PCMCIA-ATA compatible memory cards

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2 FUNCTIONAL DESCRIPTION
The Memory Module, M-MEM contains a memory board and a LED (Light Emitting Diode) board
attached to the front panel.
The front panel has a dual PCMCIA card connector for two MemCards. Above the card slots there
are two push buttons for removing the MemCards from the module, and two memory card specific
LEDs. The LEDs are on during memory card read and write operations to notify the user not to
remove them until the operation is complete.

2.1 Memory Module, M-MEM

2.1.1 Memory board

Processor section
Basically, the memory module is a single board PC with any unnecessary I/O functions removed.
The processor is Intel 80C186 compatible and the software runs under the DOS operating system.
Operating frequency is 16 MHz. The board has 512 kB RAM, 448 KB ROM, 128 kB EEPROM and
associated buffer circuits for memory operations.
The Intel 82365SL compatible PC Card Interface Controller (PCIC) provides all the functions
needed in MemCard operations. Serial communication, EEPROM read and write operations and
LED control is accomplished through a QUART circuit. In addition, the processor board contains
circuitry to control reset signals and MemCard programming voltages.
The memory module board block diagram is shown in figure 1.

PCMCIA card interface

M-MEM has PCMCIA compatible card sockets for two MemCards. Both sockets consist of 60 signal
and 8 power connections. MemCards are PCMCIA-ATA compatible, and their memory capacity
is 6 MB.
All MemCard read and write operations as well as card power management are controlled by a
PCIC interface controller.
Card removals and insertions are also detected by the interface controller.
MemCard files are MS-DOS compatible and they can be copied for archiving with any MS-DOS
compatible computer equipped with any PCMCIA-ATA specification compatible card drive.

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Address/
data Address
Address bus record
latches control
Processor logic
80C186X

Control
bus Data
bus
Data
buffer 0.5 MB static
RAM

Serial,
EEPROM & 448 kB flash
LED control memory

Serial
communication
Module bus
connector

Reset,
+5 V & Power &
+12 V reset
control

Memory Memory card

data buffers address buffers
PCMCIA
memory
card
controller
MEM_brd_blck_dgrm.vsd

Card data
Memory card
power control Card control Card address

Dual slot PCMCIA memory

Card power card connector

Figure 1 Memory board block diagram

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Serial communication
Serial communication between the module and main CPU board is performed through a module
bus TTL-level RS-232 interface. The data transfer rate is 76.8 kbps.
An RS485 type monitor reset signal is converted to module reset by an interface transceiver, and
power reset is generated by a reset circuit.

Power supply
The module receives its power (+5 V, +15 V) from the monitor. The PCMCIA card programming
voltage +12 V is generated from +15 V by voltage regulators. Card programming voltage is
controlled by an interface controller. Otherwise, only +5 V power is used in the module. Maximum
power consumption is 2 W.

2.1.2 LED board

The LED board contains only two yellow light emitting diodes and a three-lead cable to the memory
board.

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Connectors and signals

13 1
25 14

Module bus connector (X1)

Pin No I/O Signal
1 I RESET_RS485*
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC*
5 - -DATA_RS485
6 - DATA_RS485
7 - Ground & Shield*
8 I -RESET_RS485*
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 - Ground & Shield*
14 I +32 VDIRTY
15 I GroundDIRTY
16 O CTSC*
17 I RTSC*
18 O RXDC*
19 I TXDC*
20 - ON/STANDBY
21 - BIT0IN
22 - RXDD_RS232
23 - TXDD_RS232
24 I +5 VDC*
25 I +5 VDC*
* Used in MEM module

LED board connector (X5)

Pin No I/O Signal
1 O +5 V
2 O LED1 control
3 O LED2 control

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Connector board connector (X1)

Pin No I/O Signal

1 I Ground & Shield*
2 I Ground & Shield*
3 I -RESET_RS485*
4 I +15 VDC*
5 I RESET_RS485*
6 O CTSC*
7 I RTSC*
8 O RXDC*
9 I TXDC*
10 - N/C
11 - N/C
12 - N/C
13 I +5 VDC*
14 I +5 VDC*

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the memory module is limited to replacing faulty PC boards, MemCards or
mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
CAUTION Only trained personnel with the appropriate tools and equipment should perform
the tests and repairs outlined in this section. Unauthorized service may void the
warranty of the unit.

3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures. The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
MemCard - Menu (PCMCIA-ATA)
MemCard - Data (PCMCIA-ATA)
M-NE(12)STPR/M-ESTPR/M-ESTP
Patient simulator
Screwdriver
• Detach the module box by removing the two screws from the back of the module. Be careful
with loose latch and spring pin for locking.
1. Check internal parts:
− screws are tightened properly
− cables are connected properly
− all IC’s that are on sockets are attached properly
− EMC covers are attached properly
− there are no loose objects inside the module

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2. Check external parts:

− the front cover and the front panel sticker are intact
− the memory card housing frame is intact
− the module box, the latch and the spring pin are intact

?
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until the monitoring screen appears.
• Configure the monitor screen so that all the needed parameters are shown, for example as
follows:

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - ECG1

Field 2 - ECG2
Field 3 - P1
Field 4 - P2
Field 5 - PLETH
Field 6 - OFF
• Insert the M-NE(12)STPR/M-ESTPR/M-ESTP. Connect a patient simulator to the module
and check that all connected parameters are shown on the screen.

3. Plug in the Memory Module without memory cards. Check that the module goes in smoothly
and locks up properly.

?
4. Check that both LEDs on the module’s front panel light up briefly when the module is
connected.

?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding MEM software by selecting Scroll Vers and turning the
ComWheel.

?
6. Enter the memory module service menu:

...Frame - MemCards

Check that the module is recognized properly, i.e. “Module present” and “Module active”
state YES.

?
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7. Check that the Memory board memories and the PCMCIA controller have passed their tests.
The status for each should be OK.

?
• Select ...Frame - Communication.

8. Check that “Interface status” states ACTIVE continuously and the error counter values on the
bottom part of the menu are stable.

?
• Select ...Frame - MemCards

9. Insert a Memory card labelled “Menu” in the left hand side memory card slot. Check that the
message “Menu Card inserted” appears onto the message field and the white menu card
symbol onto the upper right hand corner of the screen within 1 minute.

NOTE: The battery symbol overrides the memory card symbols in the Compact Monitor.

Wait until the information regarding SLOT1 is fully updated in the service menu then check
that the “Card type” states MENU and the “File system” ATA.

Check that the rest of the information for SLOT1 is reliable and no errors have been
detected.

?
10. Insert a Memory card labelled “Data” in the right hand side memory card slot. Check that
the message “Data Card inserted” appears onto the message field and the green menu card
symbol onto the upper right hand corner of the screen within 1 minute.

Wait until the information regarding SLOT2 is fully updated in the service menu then check
that the “Card type” states DATA and the “File system” ATA.

Check that the rest of the information for SLOT2 is reliable and no errors have been
detected.

?
• Enter the Save Modes -menu:
Monitor Setup - Install/Service (password 16-4-34) - Save Modes (password 13-20-31)

Save the current modes into the Menu card by selecting LOAD MODES and then TO
MEMORY CARD --> SAVE. Wait until the text “Saved” appears then return to the previous
menu.
• Change the name for the mode number 1:

Highlight the mode number 1, press the ComWheel and select NAME. Select suitable
characters from the list by turning and pressing the ComWheel, then confirm the new name
by selecting END.

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11. Load the original modes from the Menu card by selecting LOAD MODES and then FROM
MEMORY CARD --> LOAD. Wait until the text “Loading” changes to “Loaded”, then return to
the previous menu.

Check that the mode number 1 has got back its original name.

?
• Press the membrane key Display Trends. Check that there are enough trend information
available for the monitored parameters.

• Erase the trends:

Reset Case - Reset All - Yes

Check that the trends have been erased by pressing the key Display Trends again

12. Reload the trends from the Data card by pressing the key Patient Data, selecting Patient
From Card, pressing the ComWheel on the last saved file (the file information is shown at
the bottom of the menu) and selecting Load.

Wait until the message “Loading from Mem. Module” disappears then check that the
original trends are available again by pressing the key Display Trends.

?
13. Perform electrical safety check and leakage current test.

?
14. Check that the module functions normally after the performed electrical safety check.

?
15. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

The memory module is disassembled in the following way. See the exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly to detach it from main body. Be careful with loose latch and
spring pin for locking.
3. Remove the two screws that are located on the module bus connector and the screws that
connect the front panel frame to the Memory board.
4. Disconnect the LED board cable and remove the front panel frame.
5. Remove the EMC cover carefully from around the Memory board.

CAUTION When reassembling the module, make sure that the cables, especially the LED
board cable, are reconnected properly.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

4.1.1 Memory Module

Trouble Cause Treatment
‘Memory module removed’ message Module removed from monitor frame. Insert module in the module frame.
Possible error in data communication between the Remove module briefly from the monitor.
module and the monitor. Insert module back to monitor frame. If
the message persists replace the
memory board or the main CPU board.
‘Memory module error’ message Module has detected an error condition. If message persists, remove module for
repair.
‘Memory module comm. error’ message Module not properly attached to monitor frame. Check module attachment.

4.1.2 Memory cards

Trouble Cause Treatment
‘Two Data Cards in mem. module’ Two Data cards detected. Remove MemCard from the left hand side
message slot of the module.
‘Two Menu Cards in mem. module’ Two Menu cards detected. Remove MemCard from the right hand
message side slot of the module.
‘No menus in Menu Card’ message There are no menus in the Menu card. Insert a Menu card with valid menu
configuration files in the module.
‘Faulty Data Card - change card’ An error has occurred during Data card read/write Change Data card.
operation
‘Faulty Menu Card - change card’ An error has occurred during Menu card read/write Change Menu card.
operation

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Frame - MemCards.

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5.1 MemCards Status menu

Module Present indicates whether the module is firmly
attached to the monitor. Possible values are YES and NO.
Module Active indicates whether the module services are
available. Possible values are YES and NO.
ROM indicates the status of the ROM memory of the
module. Possible values are OK and ERR.
RAM indicates the status of the RAM memory of the
module. Possible values are OK and ERR.
PCMCIA indicates the status of the PCMCIA controller of
the module. Possible values are OK and ERR.
EEPROM indicates the status of the EEPROM memory of
the module. Possible values are OK and ERR.
SLOT1 and SLOT2 indicates the left hand slot and the
right hand slot , respectively.
Card type indicates whether the card is MENU or DATA
card. If duplicated card is inserted, type DUPL.
File system indicates the type of the used memory card.
The only supported file system is ATA. If a memory card
using another file system is used, the message
UNKNOWN is shown. If the card is poorly attached, the
message LOOSE is shown.
Card size indicates the total amount of the disk space in
the card in kilobytes.
Card used indicates the total amount of the used disk
space in the card in kilobytes.
Card full indicates whether the all disc space in the card
is used. Possible values are YES and NO.
Card empty indicates the lack of menu files in the MENU
card or no files in the DATA card. Possible values are YES
and NO.
Read error indicates whether the reading from the card
has failed. Possible values are YES and NO.
Write error indicates whether the writing to the card has
failed. Possible values are YES and NO.
All values can be '- - -' to indicate 'No data available'.

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5.2 Communication
Interface status indicates the status of data link between
the monitor and memory module. If memory module is
properly attached, the status should always be on ACTIVE.
If status blinks between ACTIVE and CLOSED, a
communications error has occurred: remove module
briefly, and insert it back to the monitor frame to check if
error disappears.
Message types indicates the type of data packets that
have been sent (Tx) and received (Rx) since last monitor
start. Data types are listed on the lines below Message
types text.
Record K indicates the communication between the
Monitor and Record Keeper.
File Operation indicates the operations of Patient data.
Service indicates the Memory Module operations.
Modes indicates the User Mode operations.
Module status indicates the numberof sent/received
data packets that relate to the memory module status.
Packets total indicates the total amount of data packets
that have been sent/received since last monitor start.
Bytes total indicates the total amount of data bytes that
have been sent/received since last monitor start.
The last four lines indicates transmission errors:
Timeouts indicates the number of time-outs that have
occurred in memory module data transmission since last
monitor start.
Chksum err indicates the number of checksum errors in
data packets from memory module since last monitor
start.
Lenght err indicates the number of data packets with
erroneous length from the memory module since last
monitor start.
Duplicated indicates the number of duplicate data
packets from the memory module since last monitor start.

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6 SPARE PARTS

6.1 Spare parts list

6.1.1 Memory Module, M-MEM

13

1
4 4

2 3

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Front panel frame, M-MEM 883838
6 Front Panel sticker ; M-MEM (rev.04->) ; S/5 898860
6 Front Panel sticker, EN ; M-MEM (rev.02-03) 884597 898860
6 Front Panel sticker, JA ; M-MEM ; S/5 8000387
6 Front Panel sticker, JA ; M-MEM (rev.02-03) 888319 8000387
7 LED board, M-MEM 885252
8 Metal frame 879184
9 Cross cylinder-head screw M3x6 61721
10 Cross cylinder-head scerw M3x12 628700
11 EMC cover, M-MEM 885860
12 Memory board, M-MEM 883509
13 Insulation plate, M-MEM 886656
14 Cross cylinder-head screw M3x8 628712
Use
MEM Software
MEM Software for M-MEM rev.01-06
Upgrade Kit
8002917

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6.1.2 Memory Cards

Item Item description Order No.
Memory Card, Menu (Eng) 893860
Memory Card, Data (Eng) 887045
Memory Card, Menu (Fre) 893861
Memory Card, Data (Fre) 887047
Memory Card, Menu (Jpn) 893862
Memory Card, Data (Jpn) 890349
- Memory Card, Menu (Ger) 895880

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7 EARLIER REVISIONS
All main differences of Memory Module, M-MEM (rev. 00 – 04).

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APPENDIX A

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 APPENDIX A, Service check form, M-MEM

SERVICE CHECK FORM

Memory Module, M-MEM
Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation

Notes

4. Front panel LEDs

5. Module software MEM

6. Module recognition 7. Memories and PCMCIA
controller
8. Communication 9. Menu -card recognition

10. Data -card recognition 11. Menu -card functions

12. Data -card functions

Notes

13. Electrical safety check 14. Functioning after

electrical safety check
15. Final cleaning

Notes

Used Spare Parts

Signature

A-1(1)
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Document No. 8001020-5

 Datex-Ohmeda
S/5™ Interface Module, M-INT (Rev. 01)
Technical Reference Manual

All specifications are subject to change without notice.

Document No. 8001021-4

January 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
mailto:product.support.ussub@us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
www.us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Interface Module, M-INT (Rev. 01)
TABLE OF CONTENTS i
TABLE OF FIGURES i
Introduction 1
1 Specifications 2
1.1 Serial I/O Definitions ................................................................................................................................2
1.2 Analog definitions.....................................................................................................................................2
2 Functional Description 3
2.1 Main components.....................................................................................................................................4
2.2 Connectors and signals.............................................................................................................................5
2.2.1 Module bus connector ......................................................................................................................5
2.2.2 Interface board connectors ...............................................................................................................6
2.2.3 Front panel connectors .....................................................................................................................6
3 Service Procedures 8
3.1 General Service Information ......................................................................................................................8
3.2 Service check ...........................................................................................................................................8
3.2.1 Recommended tools ........................................................................................................................8
3.3 Disassembly and reassembly ..................................................................................................................12
4 Troubleshooting 13
4.1 Troubleshooting chart .............................................................................................................................13
5 Service MENU 14
5.1 Interface menu .......................................................................................................................................15
6 Spare Parts 17
6.1 Spare Parts List.......................................................................................................................................17
6.1.1 Interface Module, M-INT, Rev. 00, 01 ..............................................................................................17
7 Earlier Revisions 19
APPENDIX A 21
Service check form 1

TABLE OF FIGURES
Figure 1 Interface Module, M-INT........................................................................................................................1
Figure 2 Interface Module, M-INT, block diagram.................................................................................................3
Figure 3 Exploded view of module box and M-INT ..............................................................................................17

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ii
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 Interface Module, M-INT

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Interface Module, M-INT. The Interface module is a single width plug-in module
designed for use with the S/5 Monitors. Later in this manual modules may be referred to w/o the
system name S/5 for simplicity.
Please refer to theTechnical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.

The Interface Module, M-INT, provides an interface between the S/5 Monitors and other external
monitors such as, Datex-Ohmeda Cardiocap and Capnomac Ultima, Criticon Dinamap 1846 SX,
and Abbott Oximetrix 3.

Figure 1 Interface Module, M-INT

NOTE: The Interface Board, B-INT, and Interface Module, M-INT, cannot be used simultaneously in
the same monitor.

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1 SPECIFICATIONS

1.1 Serial I/O Definitions

• RS-232 buffered (channels 1-2)
• All standard baud rates are possible from 300 to 115200
• Each interfaced device has a fixed baud rate.

1.2 Analog definitions

• There are four analog inputs available on channel 1 and four on channel 2.
• All analog inputs are Op-Amp buffered, with an input impedance of 1 MΩ. Each analog
input is also equipped with a 1 MΩ pull-down resistor to -12 V for NC detection.
• Sampling rate: 10 ms/sample/channel
• Input range: -10 V...+10 V
• Resolution: 10 bits → 1024 voltage levels in input range

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2 FUNCTIONAL DESCRIPTION
The Interface Module, M-INT, detects and identifies the external monitors connected to the module.
The identification is made by a serial string, sent by the external monitor.
When an external monitor is connected to the Interface Module, numeric data is always displayed
on the monitor screen. Also, analog real time waveforms are displayed, if the external monitor is
able to send them.
Connections from the Interface Module to external monitors are isolated from the S/5 monitor.

ROM
DATA
RS232 2 x RS232
MODULE BUFFERS SERIAL
CONTORL
BUS PROCESSOR LINES
RESET 80C196KC
LOGIC
SRAM

MINT_block_diagram.vsd
RS485
BUFFERS
QUART
EEPROM

8 8 8 ANALOG
INPUTS
8 LOW-
PASS
FILTERS

isolation

Figure 2 Interface Module, M-INT, block diagram

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2.1 Main components

The Interface Module contains an 80C196KC16 microprocessor.

External Connections
The connectors on the Interface Module are:
• One 25-pin D-connector X1 for the module bus.
• Two 9-pin connectors, X2 and X3, for external monitors. These are internally connected to
two 9-pin female D-connectors via ribbon cables.
Each X2 and X3 connector has an RS-232 serial communication channel and four analog inputs.

RS-485 Serial Communication

The Interface Module uses RS485 signal levels when communicating with the external monitor. The
RS485 signals are transformed to digital signal levels and fed via an opto-isolator to the
microprocessor. The communication signals for transmitting (TxD) and receiving (RxD) data are sent
to the microprocessor ports. The direction of the communication is controlled by REC/SND signals,
generated by the microprocessor, via the opto-isolator. When the module bus is reset, the
communication is always set to the receiving state.

Reset
The interface board resets when module bus is reset. The RESET signal is converted from an RS-
485 signal level to a digital signal level and then fed to an opto-isolator. The RESET signal is
renamed to POWEROK signal. The POWEROK signal resets the microprocessor and the GAL circuit.

RS-232 Serial Communication

A QUART is used to provide four serial communication channels with external monitors. However,
only two channels are used. The microprocessor controls resetting of the QUART during normal
operation. When the microprocessor is reset the QUART is also reset.

Memories
There are static RAM, ROM, EEPROM memories in the Interface Module. The memory decoding is
done with the GAL circuit. The microprocessor communicates with the EEPROM in serial mode.

Analog Inputs
Eight analog inputs from the serial/analog connectors are connected to eight low pass filters. The
frequency limit (-3 dB) is set to 35 Hz. The input signal levels are between -10 V and +10 V, and the
output signals are scaled between 0 V and 5 V. The output signals are then fed to the
microprocessor A/D inputs.

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2.2 Connectors and signals

2.2.1 Module bus connector

13 1
25 14

Module Bus Connector (X1)

Pin No I/O Signal
1 O RESET_RS485
2 O -15 VDC
3 O +15 VDIRTY
4 O +15 VDC
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 Ground & Shield
8 O -RESET_RS485
9 O CTSB
10 I RTSB
11 O RXDB
12 I TXDB
13 Ground & Shield
14 O +32 VDIRTY
15 O GroundDIRTY
16 O CTSC
17 I RTSC
18 O RXDC
19 I TXDC
20 ON/STANDBY
21 BIT0IN
22 RXDD_RS232
23 TXDD_RS232
24 O +5 VDC
25 O +5 VDC

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2.2.2 Interface board connectors

Power test connector (X11)
Pin No Signal
1 +5 V TEST
2 +5 V ref
3 +12 V
4 GND
5 -12 V
6 NC

Analog test connector (X5)

This connector is for factory tests only.
Pin No Signal
1 ACH0
2 ACH1
3 ACH2
4 ACH3
5 ACH4
6 ACH5
7 ACH6
8 ACH7
9 GND

2.2.3 Front panel connectors

1 5

6 9

Serial/Analog connector(X2) CH 1 (floating, off-board)

Pin No Definition
1 A0 analog input
2 RXD
3 TXD
4 A1 analog input
5 GND
6 A2 analog input
7 RTS
8 CTS
9 A3 analog input

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Serial/Analog Connector (X3) CH 2 (floating)

Pin No Definition
1 A4 analog input
2 RXD
3 TXD
4 A5 analog input
5 GND
6 A6 analog input
7 RTS
8 CTS
9 A7 analog input

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3 SERVICE PROCEDURES

3.1 General Service Information

Field service of the Interface Module, M-INT, is limited to replacing faulty circuit boards. A faulty
circuit board should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

3.2 Service check

These instructions include complete procedures for a service check. The service should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Datex-Ohmeda gas monitor with the SpO2 measurement e.g. ULT-S
INT Interface cable 892377
Calibration gas
SpO2 probe
Screwdriver

• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring locking pin.

1. Check internal parts:

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• screws are tightened properly

• cables are connected properly
• all socket mounted IC’s are inserted properly
• the EMC cover is attached properly
• there are no loose objects inside the module

?
2. Check external parts:
• the front cover and the front panel sticker are intact
• the block screws for cables are in place and are tightened properly
• the block screw threads are intact
• all connectors are intact and are attached properly
• the module box, latch and spring locking pin are intact

?
Reattach the module box and check that the latch moves properly.

3. Plug the Interface Module into the monitor Central Unit. Check that it goes in smoothly and
locks up properly.

?
• Connect the Datex-Ohmeda gas monitor with the interface cable (order code 892377) to
Interface Module, M-INT, connector 1. Lock the cable properly.

• Turn both monitors on.

• Make sure the serial output mode of the Datex-Ohmeda gas monitor being used is set to
NUMERIC.

• Configure the S/5 monitor screen so that all required parameters are shown, for example:

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 5 - Pleth

Field 6 - Co2

4. Set the interface for the Datex-Ohmeda gas monitor being used:

Monitor Setup - Install/Service (password 16-4-34) - Installation -

Interfacing - Gases/Spiro - XXX
SpO2 - XXX

XXX = the gas monitor being used

Check that the menus NIBP and SvO2/C.O. are selectable from the menu.

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?
5. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding Interface Module, M-INT, software by selecting SCROLL
VERS and turning the ComWheel.

?
6. Enter the M-INT service menu:

Parameters - More - Interface

Check that the “Timeouts”, “Bad checksums” and “Bad c-s by mod” values are not
increasing faster than by 5 per second. Check that the Interface Module M-INT memories
have passed the internal memory test, i.e. “RAM” and “ROM” state OK.

?
7. Check that the interfaced gas monitor is identified, i.e. the required waveform fields are
shown on the screen and the gas monitor type in shown correctly on the service menu.

Check that the communication state is “online”.

?
8. Select GASES from the M-INT service menu.

Check that “id:” states the correct monitor and interface type, “Active” states YES and
“Timeout” NO.

Check that the numeric values on the service menu are reasonable.

Simulate breathing by feeding calibration gas into the Datex-Ohmeda gas monitor sampling
line and check that the values on the service menu correspond with the values on the gas
monitor screen.

Check that the values in the S/5 monitor gas waveform field are correct and a proper CO2
waveform is shown.

Stop feeding the calibration gas. Check that the message “Apnea” appears in the S/5
monitor waveform field, and in the message field, if the selected interface type is ULT/al.

?
9. Select SpO2 from the M-INT service menu.

Check that “id” states the correct monitor and interface type, “Active” states YES and
“Timeout” NO.

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Check that “ProbeOff” shows 1 when no SpO2 probe is connected to the interfaced gas
monitor. Connect the SpO2 probe and check that the “NoProbe” shows 1.

Attach the SpO2 probe to your finger and check that the values on the menu correspond
with the values on the gas monitor screen.

Check that the values in the S/5 monitor pleth waveform field are correct and a proper pleth
waveform is shown.

Disconnect the SpO2 probe. Check that the message “Probe off “ appears in the S/5
monitor waveform field, and “SpO2 probe off” appears in the message field, if the interface
type is ULT/al.

?
10. Turn the gas monitor off. Check that the messages “Interfaced Gas monitor removed” and
“Interfaced SpO2 monitor removed” appear on the S/5 monitor screen.

?
11. Turn the S/5 monitor off. Connect the gas monitor with interface cable to Interface Module,
M-INT connector 2.

Turn the monitors on and check that the necessary numerics and waveforms are still
interfaced, together with the alarms, if the interface type is ULT/al.

?
12. Disconnect the Interface Module, M-INT, for a moment, then plug the module back into the
monitor.
Check that interfacing with the gas monitor is restored.

?
13. Perform an electrical safety check and a leakage current test.

?
14. Check that the Interface Module, M-INT, functions normally after performing the electrical
safety check.

?
• Set the interface back for modules:
Monitor Setup - Install/Service (password 16-4-34) - Installation -
Interfacing - Gases/Spiro - Module
SpO2 - Module

15. Clean the module with suitable detergent.

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?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

Disassemble the Interface Module, M-INT, in the following way (see Figure 3 Exploded view of
module box and M-INT).
1. Remove the two screws from the back of the module.
2. Pull the module box slowly backwards and remove it from the main body.
3. To detach the circuit board, remove four screws and disconnect the two ribbon cables from
the front panel.
To reassemble the module, reverse the order of the disassembly steps.

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4 TROUBLESHOOTING
Enter the Service Menu (see chapter 5). Select Scroll Vers and scroll down the SW version/Unit id
list. Make sure that the software code and level, control and serial numbers of the Interface
Module, M-INT, are displayed under B-INT/M-INT.
If they are not displayed, the Interface Module, M-INT, is faulty.

4.1 Troubleshooting chart

Trouble Cause Treatment
M-INT not active in the Service Menu. Module is not connected Check that the module is firmly
Software version and ID data are not properly. pushed into the module slot.
available in the Service Data field.
M-INT is faulty Replace M-INT Interface board.
Measured values from the interfaced Monitor not selected for Select the right monitor from the
monitor do not appear on the display interface. Interfacing menu.
after approximately one minute.
Poor contact in the interface Check the cables and
cables. connections. Change the cable to
another connector.
Wrong interface cable. Check cable type and change if
necessary.

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters - More - Interface.

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5.1 Interface menu

Interface
Gases, SpO2, NIBP, Spirometry, SvO2/C.O. indicate the parameters for which service data is
available. The data which can be seen on those pages is raw data from the interfaced monitors,
which will be processed for the normal screen.
Service Data
I-INT: Indicates the status of the interface via the UPI4(NET) Board.
B-INT: Indicates the status of the interface via the 4 interface channels of
B-INT or two channels of M-INT module.
id: The name of the interfaced monitor, e.g. Ultima.
state: describes the state of the connection, alternatives are:
'init' - the channel is initialized
'wait' - the monitor is waiting for the external monitor
'online' - the connection is ready
'search' - the external monitor is being searched
rt: real time values that are available via the interface.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to the monitor has failed.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors which cause these numbers rise.
RAM indicates the state of the RAM memory.

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ROM indicates whether the checksum in the ROM is in accordance with the software calculated
value.
The state is either OK, Fail or ? (module not in place or a communication error).

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6 SPARE PARTS

6.1 Spare Parts List

NOTE: Accessories are listed in the Patient Monitor Supplies and Accessories.

6.1.1 Interface Module, M-INT, Rev. 00, 01

Figure 3 Exploded view of module box and M-INT

Item Description Order No. Replaced by

1 Module box (single width) 886167
2 Latch for module box 879181
3 Spring pin 879182
4 Cross recess screw M3x8 black 616215
5 Interface board, M-INT (rev.00) 890843
6 Cross cylinder-head screw M3x6 61721
7 Metal frame 879184
8 EMC cover 884099
9 D-connector with flat cable, M-INT 891432
10 Cross cylinder-head scerw M3x12 628700
11 Block screw for cables, M-INT 891033

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Item Description Order No. Replaced by

12 Fitting plate, M-INT 890869
13 Connector plate, M-INT 890357
14 SP-Front mask 879094
15 Nut-hex,stzn, M3 63116
16 Cross cylinder head screw M2.5x10 628708
17 Front Panel sticker, EN ; M-INT (rev.01) ; S/5 8000214
17 Front Panel sticker, M-INT (rev.00) 890896 8000214

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7 EARLIER REVISIONS
All main differences of Interface Module, M-INT (rev. 00), are noted in this manual.

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APPENDIX A

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SERVICE CHECK FORM

Interface Module, M-INT
Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Installation

Notes

4. Interface selection

5. Module software M-INT

6. Communication and 7. Recognition of
memories connection
8. Gas interface (1) 9. SpO2 interface (1)

10. Recognition of 11. Interface (2)

disconnection
12. Restarting

Notes

13. Electrical safety check 14. Functioning after

electrical safety check
15. Final cleaning

Notes

Used Spare Parts

Signature

A-1(1)
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S/5TM Device Interfacing Solution, N-DISxxx (Rev. 00)

Technical Reference Manual Slot

Document No. 8005676

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 7550, P.O. Box 900, FIN-00031
Madison, WI 53707-7550 DATEX-OHMEDA, FINLAND
U.S.A. Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. +1-608-221 1551 www.datex-ohmeda.com
Fax +1-608-222 9147  Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
www.us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5TM Device Interfacing Solution, N-DISxxx (rev. 00)
TABLE OF CONTENTS i
TABLE OF FIGURES ii
INTRODUCTION 1
1 SPECIFICATIONS 3
1.1 Environmental specification...................................................................................................................3
1.1.1 Protection against ingress of liquids ............................................................................................3
1.2 Technical specifications ........................................................................................................................3
1.2.1 General......................................................................................................................................3
1.3 Electrical specification ..........................................................................................................................4
1.4 Maximum power consumption ...............................................................................................................4
1.5 Module communication.........................................................................................................................4
2 FUNCTIONAL DESCRIPTION 5
2.1 Main components .................................................................................................................................5
2.2 DIS module...........................................................................................................................................6
2.3 Connections .........................................................................................................................................7
2.4 Connectors and signals .........................................................................................................................8
2.5 Interfaced devices, parameters and communication...............................................................................9
3 SERVICE PROCEDURES 11
3.1 General service information .................................................................................................................11
3.2 Service check......................................................................................................................................11
3.2.1 Visual inspection......................................................................................................................12
3.2.2 Functional inspection ...............................................................................................................12
4 TROUBLESHOOTING 15
4.1 LED indicators.....................................................................................................................................15
4.1.1 Green LED................................................................................................................................15
4.1.2 Yellow LED ...............................................................................................................................15
4.2 Quick functional check ........................................................................................................................15
5 DEVICE INTERFACING SOLUTION MENUS 17
5.1 DIS Status menu .................................................................................................................................17
5.1.1 Interfacing................................................................................................................................17
5.1.2 Status Page .............................................................................................................................18
5.2 Service Menu......................................................................................................................................19
5.2.1 DIS Interfacing .........................................................................................................................19
6 SPARE PARTS 21
7 EARLIER REVISIONS 23
APPENDIX A 25
Appendix A: SERVICE CHECK FORM ..............................................................................................................A–1

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TABLE OF FIGURES
Figure 1 Example of interfacing via the Device Interfacing Solution, N-DISAEST and N-DISRGM ............................1
Figure 2 Implementation of Device Interfacing Solution .......................................................................................5
Figure 3 DIS module ..........................................................................................................................................6

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Device Interfacing Solution, N-DISxxx. Later in this manual modules may be
referred to w/o the system name S/5 for simplicity.
Please refer to theTechnical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
Please also refer to the Installation Guide accompanying each module.
The purpose of the Device Interfacing Solution is to produce a data connection between an external
bedside device and an S/5 monitor.
The N-DISxxx is a new interfacing solution and works beside the previous interface solutions, B-INT
and M-INT that are still available.
Up to 10 devices can be connected simultaneously via device specific N-DISxxx modules. No
Device Interfacing Solution is called N-DISxxx the xxx are replaced with a device specific ending
like N-DISAEST and N-DISRGM.

2
1

Figure 1 Example of interfacing via the Device Interfacing Solution, N-DISAEST and
N-DISRGM

(1) Datex-Ohmeda S/5 Anesthesia Monitor (with software L-ANE01(A) or greater)

(2) Aestiva3000 anesthesia machine
(3) RGM monitor
(4) DIS module (max. 10 pcs)

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NOTE: The Device Interfacing Solution requires S/5 monitor software version 01 or greater.
NOTE: The Device Interfacing Solution requires B-UPI4(NET).

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1 SPECIFICATIONS

1.1 Environmental specification

Operating temperature +10...+35 °C (50...95 °F)
Storage and transport temperature -10...+50 °C (14...122 °F)
Relative humidity 10...90 % (non condensing)
Atmospheric pressure 660...1060 hPa
(66...106 kPa/660...1060 mbar/500...800 mmHg)

1.1.1 Protection against ingress of liquids

According to IEC/EN 60592 class IPX 1.
The DIS module must always be used in a vertical position to prevent water from entering the
module.

1.2 Technical specifications

1.2.1 General
Max 10 DIS modules or 10 m (33 ft) cable length.
Module
Size (W × D × H) 60 × 27 × 85 mm/2.4 × 1.1 × 3.4 in
Weight 0.1 kg/0.2 lbs
Bus cables
8 pin Hirose HR12/HR212 connector
Material black PVC
Lenght/Weight 1 m/47 g (39 in/3.3 ft./0.104 lbs.)
2 m/85 g (79 in/6.6 ft./0.187 lbs.)
6 m/220 g (236 in/19.7 ft./0.485 lbs.)
Device cables
Depends on device.
Material elastollan
Lenght 0.5...1 m (19...39 in/1.6...3.3 ft.)
Weight 40...70 g (0.088...0.154 lbs.)

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1.3 Electrical specification

There is no isolation in the DIS module. The interfaced device, DIS module and monitor must be
situated in the same patient environment (as defined in IEC 60601-1-1).

WARNING Connecting electrical equipment together, or using the same extension cord for
more than one device, may cause their leakage currents to exceed the limit
specified in relevant safety standards. Always make sure that the entire
combination complies with the international safety standard IEC 60601-1-1 for
medical electrical systems and with the requirements of local authorities.

1.4 Maximum power consumption

600 mW (75 mA @ 8 V)

1.5 Module communication

Bus communication speed is 500 kbps. RS422 implementation.
Device communication speed depends on the interfaced external device. RS232 implementation.

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2 FUNCTIONAL DESCRIPTION
The S/5™ Device Interfacing Solution provides a seamless link between external patient care
devices and the Datex-Ohmeda S/5 monitoring system. You can interface simultaneously up to ten
external devices: monitors, ventilators, blood gas analyzers, etc.
The Device Interfacing Solution is designed for use with the S/5 Anesthesia Monitor and Compact
Anesthesia Monitor, and S/5 Critical Care Monitor and Compact Critical Care Monitor. The Device
Interfacing Solution (DIS) is only compatible with the S/5 Anesthesia and S/5 Critical Care Monitor
when the monitor has B-UPI4(NET) and B-CPU4 or B-CPU5 boards installed. Also, DIS is only
compatible with the S/5 version (i.e. F-CM(REC)1 frame) of the Compact Anesthesia and Compact
Critical Care monitor. In addition, the S/5 Monitors must be equipped with DIS compatible main
software. The Device Interfacing Solution, N-DISxxx can not be used with AS/3 and CS/3 Compact
Monitors.

WARNING The manufacturer guarantees a reliable functioning of the devices with tested
software versions only. Always refer to the Installation guide accompanying the
DIS module and verify the compatibility before use.

2.1 Main components

The implementation of Device Interfacing Solution can be divided into five parts:
• Device specific software
• Device specific module
• Device specific cable
• Bus cables
• Software in Datex-Ohmeda monitor

Datex-Ohmeda Monitor

DIS Module bus

DIS
DIS DIS
Module
Module Module

External
Device # 2 serial Device # 3
Device # 1 format

Figure 2 Implementation of Device Interfacing Solution

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2.2 DIS module

A DIS module receives data from an external device, converts the data to a suitable format for the
monitor and then sends the data to the monitor. The main board contains the power supply with
current limiter, microcontroller, reset circuits, memory and serial communication buffers. The board
communicates with the Datex-Ohmeda monitor through the DIS bus.
A DIS module consists of:
• Power supply with current limiter and reset circuit parts
• Microcontroller H8, internal and external RAM, non volatile memory etc.
• Programming connection
• Device communication connection and RS232 driver
• Bus communication connection and RS422 driver
• LEDs, that indicate the status of the communication
• Device specific software

to programming device to external device

Programming RS232 buffers

Controller H8 SRAM
Flash
RAM
+5 V
EEPROM

LEDs

Power
Current limit
Green Yellow
Reset RS422 buffers

DIS Bus

Figure 3 DIS module

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2.3 Connections
Connect the device specific cable to the external device and the bus cable to the D-O monitor’s B-
UPI4(NET) board, or to another DIS module.

(1) Label specifying the external device

(2) LED indicators
(3) Bus cable from another DIS module (if used)
(4) Device specific cable to the external device
(5) Bus cable to the D-O monitor’s B-UPI4(NET) board (or to another DIS module)

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2.4 Connectors and signals

Male bus cable connector

2 1
5 4 3
7 6
8

Pin no Signal Color

1 Data from UPI + brown
2 Data from UPI - red
3 VDD 9 V to 18 V (max 1 A) orange
4 GND yellow
5 VCC 7 V to 8 V (max 1 A) blue
6 GND grey
7 Data to UPI + white
8 Data to UPI - black

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2.5 Interfaced devices, parameters and communication

Ventilator interfaces
Device Device set values for Measured numeric values Waveforms Module Supported
trends name versions
Datex-Ohmeda Vent. mode, I:E ratio, RR, TV, FiO2, TVexp, MV, RR, Pmean, Paw, Flow, Vol N-DIS7900 Software
SmartVent 7900 PEEP, Pinsp, InspPause Ppeak, Pplat For ventilator version 3.3
7900 except
when used
with Aestiva.
Datex-Ohmeda Aestiva Vent. mode, I:E ratio, RR, TV, FiO2, TVexp, MV, RR, Pmean, Paw, Flow, Vol N-DISAEST Software
/5 PEEP, Pinsp, InspPause Ppeak, Pplat For all version 1.0
Aestiva /5 Compact Aestiva
anesthesia
machines.
Dräger Evita 4 FiO2, Vent. mode, I:E ratio, FiO2, EtCO2, TVexp, MV, MVspont, Paw, Flow, Vol N-DISEV4 Medibus
RR, TV, PEEP, Pinsp RR, Ppeak, Pplat, Pmean, Raw, version 4.00
Compl, PEEPi Evita 4 version
1.00
Nellcor Puritan Bennett Vent. mode, RR, TV, PEEP, expTV, expMV, expMVspont, RR, N-DIS7200 Versions
7200 O2 setting Ppeak, Pplat, Pmean, Dyn. Raw, 7200ae,
Dyn. Compl, 7200e,
I:E ratio 7200spe
Nellcor Puritan Bennett Vent. mode, I:E ratio, RR, TV, expTV, expMV, expMVspont, RR, N-DIS840 F
840 PEEP, O2 setting. Ppeak, Pplat, Pmean,
I:E ratio
Siemens Servo 300 CMV freq set, SIMV freq set, O2 insp, TV exp, TV insp, MV exp, Paw, Flow, Vol N-DISS300 Firmware
Insp. Time, MV insp, RR, Ppeak, Pplat, version 2.x
Pause time, MV, PEEP, Pmean, PEEP, PAmbient
Pinsp, Plimit,
Vent mode, O2 concentr
Dräger Primus FiO2, vent.mode, I:E ratio, FiO2, EtCO2, TVexp, MV, Paw, Flow, Vol N-DISPRIM Medibus 4.03
RR, TV, PEEP, Pinsp MVspont, RR, Pmean, Ppeak, Primus 1.05.
Pplat, Raw, Compl, PEEPi

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Monitor interfaces
Device Numeric values Module name Supported
versions
Abbott Qvue/Q2 CO, CCO, Tblood, and SvO2 (Q2 only) N-DISQVUE QVue: 2.03
Q2: 4.00
Abbott Oximetrix 3 CO, SvO2 N-DISOXIM3 Software versions
104 and 105
Aspect A-2000 BIS Monitor BIS, SQI, EMG N-DISA2000 Firmware version
1.03 or 1.06
Baxter Vigilance CO, CCO, SvO2, TBLOOD N-DISVIGIL Software version
5.02 E
Datex-Ohmeda RGM Monitor CO2, O2, N20, AA, RR, SpO2, HR, Paw, TV, MV N-DISRGM Signal version:
8.007
ACX version: 4.20
Datex-Ohmeda Tonocap PgCO2 N-DISTONO 2.1 or later
Datex-Ohmeda N-DISWHITE All versions
Capnomac, Capnomac II, EtCO2, FiCO2, EtO2, FiO2, EtN2O, FiN2O, EtAA, FiAA, AA selection,
RR, PAmbient
Satlite, Satlite trans and Satlite Plus Pulse, SpO2 All versions
Oscar oxy, Cardiocap 1GS and EtCO2, FiCO2, EtO2, FiO2, EtN2O, FiN2O, RR, Pulse, SpO2% All versions
Cardiocap 2GS
Capnomac Ultima EtCO2, FiCO2, EtO2, FiO2, EtN2O, FiN2O, EtAA, FiAA, AA selection, All versions
RR, PAmbient, Auto id AA, Pulse, SpO2%, MV exp, MV insp, TV
exp, TV insp, Compl, Ppeak, Pplat, PEEP, I:E
Normocap CD-200 EtCO2, FiCO2, EtN2O, FiN2O, RR, PAmbient All versions
Multicap, Normocap CD2-02, EtCO2, FiCO2, EtO2, FiO2, EtN2O, FiN2O, RR, PAmbient All versions

Heart-lung machines
Device Device set values Measured numeric values in Monitor name Supported
for trends trends versions
Jostra HL20 bypass on, bypass off, speed, flow rate, systolic pressure, N-DISHL20 R11
aorta closed, aorta diastolic pressure,
open mean arterial pressure, FiO2, FiCO2,
cardioplegia amount

Bloodgas analyzers
Device Numeric values Monitor name Supported
versions
AVL Opti CCA pH, PCO2, PO2, ctHb, SO2, barometric pressure, HCO3, BE, N-DISOPT 2.2
Temp, Kalium (Potassium), Natrium (Sodium), O2Ct

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the Device Interfacing Solution is limited to replacing faulty mechanical parts that
are listed as spare parts. Faulty DIS modules should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

3.2 Service check

These instructions include complete procedures for a service check for Datex-Ohmeda Device
Interfacing Solution. The service check should be performed after any service repair, however, the
service check procedures can be used also for determine possible failures.
The instructions include an Appendix A: Service Check form, to be filled in when performing the
corresponding procedures.

The symbol ? in the instructions means that the performed procedure should be signed in the
check form.

Recommended tools
Tool Order No. Notes
Screwdrivers

Recommended parts
No recommended parts.

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3.2.1 Visual inspection

• Disconnect the DIS module from the DIS bus and from the interfaced external device.

1. Internal inspection
— Disassemble the DIS module.
— Make sure there are no loose parts inside the DIS module.
— Check the screws holding the PC board are tightened properly.
— Check that the cables are attached properly and the connectors are intact.

?
2. External inspection
— Check that the DIS module case and label are clean and intact.
— Reassemble the DIS module.
— Check that the screws for the DIS module case are secured properly.
— Check that the bus cable connector is intact.
— Check that the DIS bus and device specific cables are intact.

?
3.2.2 Functional inspection
3. DIS module interface status
— Connect the DIS module to the DIS bus and to the external device that is specified in
the DIS module label, if possible. Turn on the interfaced external device.
— Check that no error messages are displayed on the monitor screen.
— Check via the Interfacing menu that the connected DIS module status is correct:
Monitor Setup - Interfacing - Status Page
— Check that the waveforms and numeric fields are transferred to the monitor
according to the configuration.

?
4. Recognition of interface
— Disconnect the DIS bus cable and check that the ‘[device name] module removed’
message appears onto the monitor screen. Reconnect the cable.
— Turn off the external device (if possible) and check that the ‘[device name]
disconnected from module’ message appears onto the screen. Turn the external
device back on again.

?
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5. DIS module service menu

— Enter the service menu
Monitor Setup – Install/Service (password 16-4-34) –
Service (password 26-23-8) –
Parameters – More – DIS Interfacing
— Check that the menu displays submenus for all connected DIS modules.
— Enter the corresponding DIS module service menu and check that the displayed
information corresponds with the information on the DIS module labels.
— Check that the DIS bus voltage is between 6.00...8.00 V.
— Check that the DIS module timeout and checksum error values do not increase more
than by 5 per second.
— Check that the status of each DIS module memory indicates OK.

?
6. Perform the electrical safety test and leakage current test. Check that the DIS module
functions normally after the tests.

?
7. Clean the DIS module, the bus cable and the device specific cable with a suitable
detergent.

?
8. Fill up all the necessary documents.

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4 TROUBLESHOOTING

4.1 LED indicators

4.1.1 Green LED

The meaning of the green LED is to indicate that communication between the monitor and DIS
module and communication between the DIS module and external device is working properly.
When all cables are connected and the connected devices are on, the green LED should be lit
continuously.

4.1.2 Yellow LED

The meaning of the yellow LED is to alert the user. The yellow LED is lit when any of the following
conditions becomes true:
1. The DIS module is connected to the DIS bus but the external device is not connected.
2. The external device is in power off state.
3. The external device is not selected from the interfacing menu as an active source of data.
NOTE: The meaning of the yellow LED varies with some external devices. See the Installation Guide
delivered with the DIS module.

4.2 Quick functional check

You have two ways for checking the function of the Device Interfacing Solution:
• Press the Monitor Setup key and select Interfacing and open the Status Page menu.
The status page shows you the current communication status of the interfacing modules
connected to the bus (1...10 pcs).

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NOTE: The status message ‘Connected’ appears on the monitor screen after you have connected
the external device to the DIS module and turned it on, if the monitor and DIS module have already
been initialized.
• Check the LED indicators on the DIS module (the green LED indicates the physical
connections, the yellow LED software selections):

GREEN YELLOW INDICATION

lit dark ● physical connections between the monitor, DIS module and external
device are in order and the device has been selected in the menu
dark ● lit physical connections between the monitor, DIS module and external
device are not in order; the external device has not been selected in
the menu (see the User’s Reference Manual of the monitor)
lit lit physical connections between the monitor, DIS module and external
device are in order but the external device has not been selected in
the menu (see the User’s Reference Manual of the monitor)
dark ● dark ● the DIS module is not connected to the monitor

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5 DEVICE INTERFACING SOLUTION MENUS

5.1 DIS Status menu

Monitor Setup - Interfacing - Status Page

5.1.1 Interfacing
For selecting the parameter data source:
• Select the desired measurement parameter (e.g., Gases).
• Select the desired source by name (e.g., Aest).

NOTE: The name of the device is visible on the list only if the device is correctly connected to the
module.

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5.1.2 Status Page

Status Page
The selection Next page is available, if more than
8 DIS modules are connected to the DIS bus
simultaneously.
Interfaces
The menu displays a list of all connected DIS
modules and the statuses of the corresponding
external devices.
If the bus voltage is too low you can not add more
devices. ‘DIS module bus voltage low. Do not add
more devices or reduce cable length’ message
appears.

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5.2 Service Menu

NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8) -

Parameters – More – DIS Interfacing

5.2.1 DIS Interfacing

The menu displays submenus for all connected DIS
modules.

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5.2.2 DIS Module specific page

Service Data
Product name: DIS module name.
Product type: DIS module type.
Driver sw id: DIS module software and its release date.
Short product name: DIS module name.
Module serial number: DIS module serial number.
HW card type: PCB type.
HW id: DIS module PCB identification number.
HW test date: DIS module PCB testing date.
Unit serial number: DIS module PCB serial number.
Comment field: Indicates the status of the external device.
bus voltage: DIS bus voltage, measured by the UPI4(NET)
board or the Central Processing Board in S/5 Compact
Monitor. The value should normally be within 6…8 V.
tout: DIS module timeouts, seen by the monitor. The value
should not increase more than by 5 per second.
cse: DIS module checksum errors, seen by the monitor. The
value should not increase more than by 5 per second.
rx: The number of data packets from the external device
received by the DIS module.
rx err: The number of data errors from the external device
received by the DIS module.
tx: The number of data packets to the external device sent
by the DIS module.
Ram: Status of DIS module RAM memory.
Rom: Status of DIS module ROM memory.
EEPROM: Status of DIS module EEPROM memory.

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6 SPARE PARTS

Item Description Order no.

1 Screw for the DIS module case 617210
2 DIS module case, rear 896930
3 Screw for the PC board 61209
4 Screw for cable 617120
5 DIS module case, front 896929
7 Bus cable, 1 m 900501
7 Bus cable, 2 m 900502
7 Bus cable, 6 m 900503
Labels for module case:
6 Label for Dräger Evita 4 Ventilator N-DISEV4 897193
6 Label for Aspect A-2000 EEG Monitor N-DISA2000 897194
6 Label for Datex-Ohmeda 5250 RGM Monitor N-DISRGM 897195
6 Label for Jostra HL-20 Perfusion Machine N-DISHL20 897196

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Item Description Order no.

6 Label for Nellcor P-B 7200 N-DIS7200 897207
6 Label for Nellcor P-B 840 N-DIS840 8002435
6 Label for Datex-Ohmeda Aestiva/5 N-DISAEST 8002595
6 Label for Abbot Q-Vue/Q2 N-DISQVUE 897210
6 Label for Datex-Ohmeda Tonocap N-DISTONO 897209
6 Label for Datex-Ohmeda Smartvent 7900 N-DIS7900 8002598
6 Label for AVL Opticca N-DISOPT 897543
6 Label for Abbot Oximetrix 3 N-DISOXIM3 8000983
6 Label for Siemens Servo N-DISS300 8000392
6 Label for Baxter Vigilance N-DISVIGIL 8002434
6 Label for Datex-Ohmeda Whiteline monitors N-DISWHITE 8000405
6 Label for Dräger Primus N-DISPRIM M1008264
Device specific cables:
8 Cable for Dräger Evita 4 Ventilator N-DISEV4 897213
8 Cable for Aspect A-2000 EEG Monitor N-DISA2000 897214
8 Cable for Datex-Ohmeda 5250 RGM Monitor N-DISRGM 897215
8 Cable for Jostra HL20 Perfusion Machine N-DISHL20 897216
8 Cable for Nellcor P-B 7200 N-DIS7200 897227
8 Cable for Nellcor P-B 840 N-DIS840 8002481
8 Cable for Datex-Ohmeda Aestiva/5 N-DISAEST 897228
8 Cable for Abbot Q-Vue/Q2 N-DISQVUE 897230
8 Cable for AVL Opticca N-DISOPT 897544
8 Cable for Datex-Ohmeda Tonocap N-DISTONO 897229
8 Cable for Datex-Ohmeda Smartvent 7900 N-DIS7900 8002597
8 Cable for Abbot Oximetrix 3 N-DISOXIM3 8002839
8 Cable for Siemens Servo N-DISS300 8002838
8 Cable for Baxter Vigilance N-DISVIGIL 8002841
8 Cable for Datex-Ohmeda Whiteline monitors N-DISWHITE 8002840
8 Cable for Dräger Primus N-DISPRIM M1011570
9 Strain relief N-DISxxx 897443
10 Screw M2.5×10 61615

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7 EARLIER REVISIONS
No earlier revisions.

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APPENDIX A

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APPENDIX A: SERVICE CHECK FORM

S/5TM Device Interfacing Solution, N-DISxxx (Rev. 00)
Customer
Service DIS module label N-DIS_______ S/N
Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test failed

OK N.A. Fail OK N.A. Fail

Visual inspection
1. Internal inspection 2. External inspection
Functional inspection
3. DIS module interface 4. Recognition of
status interface
5. DIS module service 6. Electrical safety check
menu and leakage current
test
7. Final cleaning

Notes:

Used Spare Parts

Signature

A–1 (1)
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Datex-Ohmeda S/5 monitors, M-launch

Document No. 8005676

 Datex-Ohmeda
S/5TM BIS Module
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 800 3476-2

January 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
BIS Module, M-BIS
TABLE OF CONTENTS I
TABLE OF FIGURES II
TABLE OF TABLES II
INTRODUCTION 1
1 SPECIFICATIONS 3
1.1 General specifications ..............................................................................................................................3
1.1.1 BIS Module ......................................................................................................................................3
1.1.2 Digital Signal Converter, DSC ............................................................................................................3
1.1.3 Environmental specifications ............................................................................................................3
1.2 Technical specifications............................................................................................................................3
2 FUNCTIONAL DESCRIPTION 5
2.1 Measurement principle .............................................................................................................................5
2.2 Sensor Check ...........................................................................................................................................5
2.3 Main components.....................................................................................................................................7
2.3.1 Digital Signal Converter, DSC ............................................................................................................7
2.3.2 BIS Module ......................................................................................................................................8
2.4 Connectors and signals.............................................................................................................................9
2.4.1 Module bus connector ......................................................................................................................9
2.4.2 H8 programming connectors pin order...............................................................................................9
2.4.3 BIS Engine connectors pin order......................................................................................................10
2.4.4 Keys ..............................................................................................................................................10
3 SERVICE PROCEDURES 11
3.1 General service information.....................................................................................................................11
3.2 Service check .........................................................................................................................................11
3.2.1 Recommended tools ......................................................................................................................11
3.3 Disassembly and reassembly..................................................................................................................15
4 TROUBLESHOOTING 16
4.1 Troubleshooting chart .............................................................................................................................16
4.2 Messages...............................................................................................................................................17
4.3 Troubleshooting flowchart .......................................................................................................................18
5 SERVICE MENU 19
5.1 BIS service menu....................................................................................................................................20
5.1.1 Module service page ......................................................................................................................20
5.1.2 Sensor ...........................................................................................................................................24
5.1.3 Setup.............................................................................................................................................26
6 SPARE PARTS 27
6.1 Spare part list.........................................................................................................................................27
6.1.1 M-BIS ............................................................................................................................................27
7 EARLIER REVISIONS 29

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APPENDICES A, B 31
SERVICE CHECK FORM 1
APPENDIX B, HOW TO READ HEX NUMBERS 1

TABLE OF FIGURES
Figure 1 Measurement setup ............................................................................................................................. 1
Figure 2 BIS sensor check.................................................................................................................................. 5
Figure 3 BIS measurement system block diagram............................................................................................... 7
Figure 4 Block diagram of setup......................................................................................................................... 8
Figure 5 BIS module disassembly and reassembly............................................................................................15
Figure 6 BIS module troubleshooting flowchart .................................................................................................18
Figure 7 Exploded view of module box and BIS module .....................................................................................27

TABLE OF TABLES
Table 1 Module bus connector (X1) pin description............................................................................................ 9
Table 2 Connector pinning for H8 programming connector................................................................................. 9
Table 3 Connector pinning for DSC and BIS Engine connectors........................................................................10
Table 4 Connector pinning BIS Engine power connector ..................................................................................10
Table 5 Connector pinning for BIS Engine serial data connector .......................................................................10
Table 6 Key connector pin assignments...........................................................................................................10
Table 7 Module general status ........................................................................................................................21
Table 8 BIS Engine status ..............................................................................................................................21
Table 9 BIS Engine and DSC error messages ...................................................................................................22
Table 10 DSC status....................................................................................................................................25
Table 11 Sensor status ................................................................................................................................25
Table 12 BE powup stat ...............................................................................................................................25
Table 13 HEX to binary conversion .................................................................................................................. 1

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 BIS Module, M-BIS. The BIS module is a single width plug-in module designed
for use with the S/5 monitors. Later in this manual modules may be referred to w/o the system
name S/5 for simplicity.
BIS, and the BIS logo are trademarks of Aspect Medical Systems Inc., and are registered in the
USA, EU and other countries. Later in this manual Aspect Medical Systems Inc. will be refered to as
Aspect.
Please refer to the Technical Reference Manual of the S/5 monitor for system specific information
e.g. related documentation, conventions used, symbols on equipment, safety precautions, system
description, system installation, interfacing, functional check and planned maintenance.
The BIS module is indicated for monitoring the state of the brain by data acquisition of EEG signals.
BIS may be used as an aid in monitoring the effects of certain anesthetic agents. The raw EEG
signals are processed to produce a single number, ranging from 100 for a patient being wide
awake to 0 in the absence of brain activity.
Calculated parameters are:
• Bispectral Index, BIS
• Suppression Ratio, SR
• Electromyograph EMG
• Signal Quality Index, SQI
The calculated parameters can be selected on the display, and trended, (excluding SQI).
The module has two user keys, BIS for BIS menu and Check Sensor for impedance check.

4
1

4
3

Figure 1 Measurement setup

(1) Module with BIS measurement capability, M-BIS

(2) Digital Signal Converter
(3) Patient Interface Cable
(4) BIS Sensor
NOTE: M-BIS module requires monitor software version 02 or greater.

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Accessories
The BIS measurement is based on Aspect Medical Systems Inc. technology, and all accessories
are developed and manufactured by Aspect.
NOTE: Only Aspect accessories can be used with the M-BIS module.

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1 SPECIFICATIONS

1.1 General specifications

1.1.1 BIS Module

Module size, W × D × H 37 × 180 × 112 mm/1.5 × 7.1 × 4.4 in
Module weight 0.3 kg/0.7 lbs
Power consumption 2.2 W

1.1.2 Digital Signal Converter, DSC

DSC size, W × D × H 66 × 108 × 25 mm/2.6 × 4.3 × 1.0 in
DSC weight 0.134 kg/0.3 lbs
Integral DSC Cable length 3.6m / 12.5 ft
Patient Interface Cable (PIC Plus)
length 1.2m / 4 ft

1.1.3 Environmental specifications

Operating temperature +10 … +40°C
storage temperature -25 … +70°C
relative humidity 10 … 95%, non -condensing
atmospheric pressure 700 … 1060 mbar
Protection against electrical shock Type BF

1.2 Technical specifications

Parameter specifications
BIS EEG
Epoch duration 2 seconds
Artifact rejection automatic
EEG scales 25 to 400 µV
EEG sweep speeds 12.5 / 25 / 50 mm /sec
Bispectral index (BIS) 0 to 100
Signal quality index (SQI) 0 to 100
EMG 30 to 80 db (70 to 110 Hz)
Suppression ratio (SR) 0 to 100 %
Update rate 1 second for BIS index
Filters 2 - 70 Hz bandpass (default) / 0.25Hz highpass
Smoothing rate 15 seconds, default in S/5 AM and CAM
30 seconds, default in S/5 CCM and CCCM

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DSC
Analog to digital converter noise-shaped sigma-delta
Sampling rate 16384 samples/second
Resolution 16 bits at 256 samples/second
Input impedance >50 Mohms
Noise < 0,3µV RMS (2.0µV peak-to-peak) 0.25 to 50 Hz
Common mode rejection 110 dB at 50/60 Hz to earth ground (Isolation mode)
Bandwith 0.16 to 450 Hz

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

The BIS measurement is based on EEG signals, these are processed as the BIS index. The BIS
sensor is placed on the patient’s forehead to acquire the high-resolution signals required. These
EEG signals are transferred to the digital signal converter DSC that amplifies and digitizes the EEG
signal and sends it to the module. The module calculates the BIS index and sends them to the
monitor via MBUS.

BIS measurement on the monitor screen

The waveform field shows the BIS EEG waveform. The following BIS related data appears in digit
fields and graphical trends (except SQI):
BIS number indicates the patient’s level of hypnosis, ranging from 100 for wide awake to 0 in the
absence of brain activity.
Signal Quality Index (SQI ) bar graph indicates the quality of the EEG signal in the range of 0 to
100.
Electromyograph (EMG) bar graph represents the absolute power in the 70 to 110 Hz frequency
band and ranges from 30 to 55 dB. This frequency band contains power from muscle activity
(electromyograph) as well as power from high frequency artifacts.
Suppression ratio (SR) number indicates the percentage of suppressed (flatline) EEG detected
over the last 63 seconds. It ranges from 0 to 100%.

2.2 Sensor Check

Sensor check is performed automatically at the beginning of each case when the sensor is
attached to the patient interface cable (monitor). An initial checking sensor message is shown in
digit field together with an appropriate sensor picture. The information of the passed or failed
sensor check is printed to this picture at each electrode’s location. The BIS measurement can’t
continue if the first sensor check fails. In such a case a message “Sensor check failed” is shown in
the digit and waveform field.

Figure 2 BIS sensor check

Continuous checking of the reference and signal electrodes and periodic checking of the ground
electrode is performed by default. It can be switched off by selecting the appropriate comand from
the message “Automatic check off” will appear. Sensor check can be started manually by pushing
a module key or selecting the appropriate command from the menu. Manual sensor check can be
useful e.g. when AEP's are being monitored at the same time, as the continuous sensor check

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might disturb the AEP measurement.

During periodic ground checks, the signal disappears momentarily and the message “Checking
sensor” display in the digit and waveform fields. Also, all BIS calculation stops during this check,
and no measurement values are shown.

CAUTION Continuous impedance check may need to be disabled if the 1 nA 128 Hz

impedance check signal interferes with other equipment such as evoked potential.

WARNING Make sure that the electrodes, sensor and connectors do not touch any
electrically conductive material, including earth.

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2.3 Main components

The BIS measurement chain is composed of Aspect BIS Sensor, Aspect digital signal converter, M-
BIS module containing Aspect BIS Engine board and Datex-Ohmeda’s interfacing board, and host
monitor. A block diagram of the system is shown below.

M-BIS Module

BIS Interfacing Board Keys

Controller
MBUS
Host Monitor
Power

Serial
Serial
data

data
Power

BIS Engine
Digital signal
Power

DSC

Digital Signal
Converter
Patient Isolation
Measurement
Control

PIC+
MBIS_meas_blockdiag.vsd

BIS Sensor

Figure 3 BIS measurement system block diagram

2.3.1 Digital Signal Converter, DSC

The digital signal converter, DSC, receives, amplifies and digitizes patient EEG signals. It is placed
close to the patient's head where the EEG signal is less subject to interference from other medical
equipment. The digital signal converter is connected to the module with a 3.6m long shielded
cable and to the BIS sensor with 1.2m long patient interface cable, see Figure 1. For BIS Sensor
related documentation refer to BIS documentation by Aspect, Inc.

CAUTION Do not autoclave the DSC. Do not open it for any reason.

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WARNING When using the electrosurgery unit, ensure proper contact of the ESU return
electrode to the patient to avoid burns at monitor measurement sites. Also
ensure that the ESU return electrode is near the operating area.

WARNING Radiated field strengths above 1V/m may cause erroneous measurements at
various frequencies. Do not use electrical radiating equipment close to the
DSC.

2.3.2 BIS Module

Aspect BIS Engine

The BIS Module provides Bispectral index values to the monitor. The BIS Engine processes the
digital signal from DSC and outputs the BIS index and other supporting parameters through an
asynchronous serial connection. The BIS Engine outputs the BIS Index, raw EEG, EMG, Signal
Quality Index (SQI), Suppression Ratio (SR) and electrode impedance’s. The BIS Engine software
includes Aspects' proprietary algorithm for BIS calculation.

BIS interfacing board

The BIS interfacing board supplies the data from BIS Engine to the monitor via the module bus. In
addition, the module accepts commands from the monitor via the module bus. The module also
provides supply voltages and all the required control signals to the BIS Engine and DSC.
The controller H8 has on-chip RAM and FLASH ROM, external SRAM and EEPROM.

M-BIS Module

Keys BIS Interfacing Board

SRAM EEPROM Prog

MBUS
RS485 Serial
BIS Interface board Block.vsd

H8 Controller Host Monitor

FLASH data,
RESET Power
Power

Serial
data

Aspect BIS Engine

Figure 4 Block diagram of setup

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2.4 Connectors and signals

2.4.1 Module bus connector

13 1
25 14

Table 1 Module bus connector (X1) pin description

PIN Name Description

1 Reset_ RS485 Module Bus Reset +
8 Nreset_ RS485 Module Bus Reset -
6 Data_ RS485 Module Bus Data +
5 Ndata_ RS485 Module Bus Data -
3 +15VD +15V Supply voltage
7 GND Ground
13 GND Ground
15 GND Ground
22 RS232_TXD BIS-Engine SW update, data out,
no monitor use
23 RS232_RXD BIS-Engine SW update, data in,
no monitor use
24 +5,1V +5V Supply voltage
25 +5,1V +5V Supply voltage

Other NC Not Connected

2.4.2 H8 programming connectors pin order

10 2

9 1

Table 2 Connector pinning for H8 programming connector

PIN Name Description

1 GND Ground
2 PRG_FB Program feedback
3 TxD Data output to programmer
4 RxD Data input from programmer
5 /RESET RESET input from programmer
6 VDD Power input from programmer
7 PRG_VCC Programming voltage from programmer
8 MODE.2/BOOT Control input from programmer
9 PCFB Programmer Connector feedback / GND
10 CODE_RES Coding resistor output to programmer

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2.4.3 BIS Engine connectors pin order

Table 3 Connector pinning for DSC and BIS Engine connectors

PIN Name PIN Description

Redel Samtec
1 DSC_OUTA 2 Power out A
2 DSC_OUTB 4 Power out B
3 DSC_IN 6 Data input
4 DGND 7,8,9,10 Ground
5 Chassis Ground 1,3,5, Ground

Table 4 Connector pinning BIS Engine power connector

PIN Name Description

1, 2 +12V +12V Power output for BE
5,6,7,8 +5V +5V Power output for BE
3,4,9,10 GND Ground

Table 5 Connector pinning for BIS Engine serial data connector

PIN Name Description

1 RS232_RXD Data input to BE
2 TTL_RXD Data input to BE
3 RS232_TXD Data output from BE
4 TTL_TXD Data output from BE
5 NC Not Connected
6 NC Not Connected
7 RS232_RESET Reset input to BE
8 /TTL_RESET /RESET input to BE
9 GND Ground
10 /USE_TTL TTL/RS232 selection input to BE

2.4.4 Keys
Table 6 Key connector pin assignments

PIN Name Description 1

5

1 GND Ground /NC

2 Key 1 Key 1, right
3 Key 2 Key 2 left
4 GND Ground
5 GND Ground / Shield

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-BIS is limited to replacing faulty circuit boards or mechanical parts. Faulty
circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
The Datex-Ohmeda BIS Simulator (order No. 900509) is recommended for functional checks.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, Service check form, which should be filled in when
performing the procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
BIS Simulator or 900509
BIS Sensor simulator 900508
Screwdriver

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• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring pin for locking.
1. Check internal parts:
− screws are tightened properly
− cables are connected properly
− there are no loose objects inside the module

?
2. Check external parts of the module:
− the front cover and the front panel sticker are intact
− connectors are intact and are attached properly
− the module box, latch and spring pin for locking are intact
Reattach the module box

?
3. Check the external parts of the Digital Signal Converter
− - the cover and the panel stickers are intact
− - cables and their connections are intact
Do not connect DSC to the module yet

?
Turn the monitor on and wait until the normal monitoring screen appears.
• Configure the monitor screen so that information regarding the BIS measurement is shown:

Monitor Setup - Screen 1 Setup – Waveform Fields – Field1 – BIS EEG

Others – BIS – Scale - 100uV

Others – BIS – Smoothing Rate 15s
4. Installation
Plug in the module. Check that it goes in smoothly and engages properly

?
5. Recognition of module
Check that the module is recognized, i.e. the BIS header with related information appears in
the chosen waveform field and ‘Cable off’ message is shown on field.

?
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6. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Record the information regarding the module software of M-BIS by selecting SCROLL VERS
and turning the ComWheel.
Note! DSC related data will appear only when the DSC is connected for the first time after
start-up.

?
7. Recognition of DSC
Connect the PIC+ cable to the DSC.
Connect the DSC to the module.
- Check that the DSC is recognized (DSC related data appears to the page)
- Check that ‘No sensor’ appears to the selected waveform field.

?
8. Enter the BIS module service menu:

Parameters - More… - BIS

Check that the ‘Mod Mon Timeouts’, ‘ Mon Mod Bad checksums’ , ‘ Mod Mon Bad
Checksums’, ‘ Bad Checksums from BIS’ values in the module view are not increasing faster
than by 5 per second. Check that the memories of the module have passed the internal
memory test, i.e. ‘RAM’, ‘ROM’ and ‘EEPROM’ all state OK.

?
9. Check the BIS and Sensor Check membrane keys of the module. Stay in the module view
and press each key for at least one second and check that the key being pressed is identified,
i.e. the corresponding PRESSED text appears in the service menu.

?
10. Check that ‘ Messages from BE ’ are increasing steadily.

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11. Go to the Sensor page.

Check that
- no sensor is identified
- mains frequency is set correctly
- check that ‘ BE powerup test’, ‘DSC selftest Ch1’ and ‘DSC selftest Ch2’ all show PASs
(if not, go to BIS Setup page, perform DSC Test and check the results again)

?
12. Sensor check
Connect the BIS simulator to the PIC+ cable. See that ‘Checking sensor’ text and image
appear. Wait for a while seconds and check that all sensors show PASS. Check that the
‘Sensor type’ shows Demo Sensor.

?
13. Check that the ‘BIS’, ‘SQI’ and ‘SR’ values are between 0..1000, and the ‘EMG’ value
between 0..10000. Note! If Sensor simulator 900508 is used, the values can be out of the
given range.

?
14. Go to the Module page
Check that no BIS Engine errors appear.

?
15. Perform sensor check by pressing ‘Check Sensor’ and verify sensor passes.

?
16. Perform an electrical safety check and a leakage current test.

?
17. Check that the module functions normally after performing the electrical safety check.

?
18. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

Figure 5 BIS module disassembly and reassembly

Disassemble the M-BIS in the following way.

1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose
latch and spring locking pin.
3. Detach the BIS Engine board by removing the four screws located at the corners of the board
and disconnecting the front panel connector cable.
4. Detach the interface board by removing the two screws located near the front panel frame,
disconnect the cable and pull out the front panel frame.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected
properly.

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Cause Treatment
No BIS waveforms on screen. BIS waveforms not selected on screen. Press Monitor Setup key and select BIS
waveforms on the screen.
Sensor impedance check is not available on Sensor is not connected to the DSC or DSC Connect the sensor and the DSC
menus. is not connected to the module
Sensor impedance check fails Sensor poorly attached Attach the sensor by following the sensor
instructions

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4.2 Messages
The messages below will appear in the BIS digit field (DF), BIS waveform field (WF) or at the message field (MF) at
the upper section of the Datex-Ohmeda S/5 patient monitor display.

Message Location Cause Treatment

Cable off DF DSC cable is not connected to the module. Connect the DSC to the module
BIS cable off MF
No Sensor DF Sensor is not connected to PIC+ cable or Connect the Sensor to the PIC+ cable
No BIS Sensor MF PIC+ cable is not connected to the DSC Connect the PIC+ cable to the DSC
Replace sensor and then PIC+ cable.
Incompatible sensor DF Sensor is not recognized. Connect correct type of sensor
Sensor is not a BIS sensor. Make sure PIC connector is clean and dry
Incompatible DSC DF Current module hw/sw is incompatible Connect correct type of DSC
with this DSC
E.g. DSC-2
Sensor check failed DF Sensor check failed, one or more of the Reattach the sensor to the patient by
BIS sensor electrode impedances exceeds the following the sensor instructions
check failed MF threshold. Replace the sensor
Check PIC+ cable and then DSC
Poor signal DF Artifacts, or the amount of EMG activity Check the sensor then the PIC cable.
prevents calculating BIS, data excluded. Reattach the sensor to the patient by
SQI < 50 following the sensor instructions
Checking sensor DF Sensor check in progress. Can be either Wait until the check has been performed
the initial sensor check, manual check or
the periodic check.
Checking Sensor – DF Sensor check fails, the sensor is not Attach the sensor to the patient and press
message stays more attached to the patient while connected to the Check Sensor button on the module
than 2 min. the PIC+ cable front panel
Automatic check off DF Continuous sensor checking has been Turn the check on from the BIS menu
turned off
Replace Sensor DF The sensor has passed its use by date Replace with a new sensor
The sensor has been used for 24h
High BIS impedance DF Sensor is not attached properly to the Check the cable connections
patient Reattach the sensor to the patient by
following the sensor instructions
Artifact DF Non-EEG data such as EMG, eyeblinks or Wait for good data
shivering present.
Module error DF BIS Engine failure Replace the BIS Engine
for more information see service page
description
DSC Error DF The DSC is not communicating or Replace the DSC
MF operating properly. This may occur during If the message persists, the BIS Engine
the use of electrocautery device. may require service.
For more information see service page
description
Demo data MF BIS simulator is connected Disconnect the BIS simulator

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4.3 Troubleshooting flowchart

Probably faulty Take all modules Insert M-BIS and turn power on
BIS Module out of the frame. (keep DSC disconnected)

Does
Enter the Service Yes
fault still
menu ID page
appear?

Is the module
ID displayed?
No

OK?
Fault not in BIS
Yes module

Enter the BIS

Service menu

No
No
Check are the Mod Mon Timeouts,
Mod Mon Bad checksums,
Mon Mod Bad Checksums or
Bad checksums from BE running?

Does
Yes
another
OK? module work in
the same
slot?
Yes

Check RAM, ROM

and EEPROM Yes

Yes Replace
OK?
interface board

Yes

Connect DSC into

module connector

Is DSC No
selftest Replace the DSC
passed

Check BIS Engine

errors

No Replace the BIS Engine or DSC

OK?
(depending on the error message)

Check front panel

key functions

Is the Does
No
keypad
Yes the test pass Yes Replace the
OK?
connected? with another keypad
keypad?

Yes
BIS_trbl.vsd

No No

Fault not in BIS Connect the Replace BIS

module keypad interface board

Figure 6 BIS module troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Press the Monitor Setup key - select Install/Service (password: 16-4-34) - select Service
(password: 26-23-8) - select Parameters - More... - BIS.

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5.1 BIS service menu

5.1.1 Module service page

Check Sensor activates the sensor impedance check.

Module
Measurement indicates if BIS Engine is on: ON/OFF
Imp.Check Key indicates that the key in the module front panel works properly.
Bis Menu Key indicates that the key in the module front panel works properly.
Impedance Meas indicates the impedance measurement mode. The modes are
CYCLIC/COMBINED/GROUND/OFF
BIS Engine errors: error messages created by DSC or BIS Engine. See "Table 9" below for
detailed description of the error message
Statuses (HEX): See appendix B; How to read HEX numbers.
General Status1 indicates the general status of the module. See "Table 7" to see the detailed
description of the message
Bis_status1 indicates the BIS Engine status. See "Table 8" to see the detailed description of the
message
Msgs to BE number of data packages sent from interface board to BIS Engine
Msgs from BE number of data packages sent from BIS Engine to interface board
Mod Mon Timeouts is a cumulative number that indicates how many times the module (interface
board) has not responded to monitor’s inquiry.
Mod Mon Bad Checksum is a cumulative number that indicates how many times there has been
an error in the message from module (interface board) to monitor.
Mon Mod Bad Checksum is a cumulative number that indicates how many times there has been
an error in the message from monitor to module (interface board).
Bad Checksums from BIS is a cumulative number that indicates how many times there has been
an error in the message from the BIS Engine to module interface board.

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RAM indicates the state of the RAM memory.

ROM indicates whether the checksum at the EPROM is accordance with the one the software has
calculated.
EEPROM indicates if the values stored in permanent memory are valid.
The states in memory checks are OK, Fail or ? (module not in place or a communication error).
Measured parameters indicated:
BIS indicates BIS index ; range 0..1000 (corresponds 0..100)
SQI indicates signal quality index; range 0..1000 (corresponds 0..100)
EMG indicates EMG activity level; range 0..10000 (corresponds 0..100dB NOTE! On the display
EMG will be shown between 30..55dB on the bar graph or 30..80dB on the trend)
SR indicates supression ratio; range 0...100 (corresponds 0..100%)

General_Status1 Module general status.

Table 7 Module general status

bit 0-5 Not used
bit 6 State error
bit 7 Communication failure
bit 8 Power failure
bit 9 Clock failure
bit 10 EEPROM checksum failure
bit 11 EEPROM writing failure
bit 12 ROM failure
bit 13 RAM failure
bit 14 Test mode
bit 15 Init mode

BIS_Status1 BIS Engine status

Table 8 BIS Engine status

bit 0 Check Sensor key pressed
bit 1 BIS key pressed
bit 2 Inpedance check mode cyclic
bit 3 Impedance check mode combined
bit 4 Impedance check mode ground
bit 5 Impedance check off
bit 6 Measurement on
bit 7 EEG measurement on
bit 8 Impedance check on DSC channel 1 passed
bit 9 Impedance check on DSC channel 2 passed
bit 10 BIS Engine powerup failure
bit 11 DSC selftest failure
bit 12 DSC quick test failure
bit 13 DSC selftest on
bit 14 No data from BIS Engine
bit 15 Not used

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Table 9 BIS Engine and DSC error messages

Message Errors of type 1
DSC buffer overrun
Out of dynamic memory
Execution time exceeded in main
Error in algorithm processing
Invalid state in UART receive state machine UART related errors
UART initalization error
Transmit queue full
Illegal number of data bytes for packet to be transmitted
to the Host
Illegal number of channels for EEG data Misc. errors
Illegal EEG data type
Illegal EEG data rate
Illegal EEG filter coefficients
No updates from Host Communication related errors
Bad CRC - TI_SELFTEST_CODE EEPROM CRC checks
Bad CRC - TI_RUN_CODE
Bad CRC - FPGA_CONFIG
Bad CRC - REV_INFO
Illegal serial number Serial number check
DSC failed to power up DSC related errors
Serious DSC overcurrent error
DSC receiver data overrun
DSC failed repeatedly in responding to commands
DSC update failed
Serious DSC power regulation fault
General DSC failure
Sensor Negative Ground Fault Smart sensor errors
Serious Sensor Positive Ground Fault
Serious Sensor Overcurrent Fault

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Message Errors of type 2

Illegal message ID Errors for layer 3 packets
Illegal command parameter
Illegal length for layer 2 data
Disabled interrupt received - UART related errors
UART transmitter empty interrupt
Disabled interrupt received -
UART modem interrupt
No status nibble received DSC related errors
DSC not connected
DSC disconnected after test failure
Illegal DSC ID
DSC power regulation fault
DSC interface fault
DSC did not respond to command
Illegal PIC ID
DSC overcurrent
DSC overrun
EEPROM Bad packet length Software update related errors
EEPROM Bad checksum
EEPROM Bad code length
EEPROM Illegal packet subtype
EEPROM physical write error
EEPROM NOT_DATA_TIMEOUT

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5.1.2 Sensor

Sensor type: indicates the type of the sensor connected

Lot code: indicates the manufacturing lot code of the sensor. The lot code contains the
manufacturing date and shift
Serial no: indicates the serial number of the sensor.
Shelf life: indicates max storage duration
Usage count: indicates how many times the sensor has been attached/detached. Not Active!!
Mains Freq.: indicates the set mains frequency; 50Hz/60 Hz
Sensor Impedances: indicates the last measured impedances
Imped. indicates the measured impedance value in Kohms.
Qualif. indicates the quality of the measured impedance; PASS/FAIL
BE powerup test: indicates the status of BIS Engine power up test: PASS/FAIL
DSC selftest ch1: indicates the DSC selftest status for channel 1: PASS/FAIL
DSC selftest ch2: indicates the DSC selftest status for channel 2: PASS/FAIL
Measured parameters indicated:
BIS indicates BIS index ; range 0..1000 (corresponds 0..100)
SQI indicates signal quality index; range 0..1000 (corresponds 0..100)
EMG indicates EMG activity level; range 0..10000 (corresponds 0..100dB
(NOTE! On the trend display EMG will be shown between 30..80dB)
SR indicates supression ratio; range 0...100 (corresponds 0..100%)
Statuses (HEX): See "APPENDIX B"How to read HEX numbers.
DSC status: indicates the DSC status for the four channels. See "Table 10" to see the detailed
description of the message.
Sensor status: indicates the Sensor status. See "Table 11" to see the detailed description of the
message.
BE powup stat: indicates the BE power up status. See "Table 12" to see the detailed description
of the message.

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Table 10 DSC status

bit 0 Noise test
bit 1 BIS key pressed
bit 2 Blocked droop test
bit 3 Unblocked gain test
bit 4 Impedance wait time out test
bit 5 Noise timeout test
bit 6 Blocked timeout test
bit 7 Unblocked timeout test
bit 8 DSC not connected test
bit 9 Not used test
bit 10 Not used test
bits 11 - 15 Not used

Table 11 Sensor status

bit 0 Quick selftest pass
bit 1 Quick selftest gain
bit 2 Quick selftest noise
bit 3 Quick selftest fail
bit 4 Quick selftest valid
bit 5 Sensor valid
bit 6 Sensor invalid
bit 7 Sensor too many uses
bit 8 Sensor expired
bit 9 Sensor validity unknown
bits 10 -15 Not used

Table 12 BE powup stat

bit 0 XRAM test
bit 1 Dma test
bit 2 Timer test
bit 3 Fpga test
bits 4 -15 Not used

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5.1.3 Setup

Automatic Check: A selection to define whether automatic sensor check is used ON/OFF
Test DSC indicates the status of the DSC self test; PASS/FAIL
Filters: A selection to define if filters are used
ON; disturbances are filtered from the raw EEG signal
OFF; raw EEG signal is shown

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 S/5 BIS Module, M-BIS

6 SPARE PARTS

6.1 Spare part list

6.1.1 M-BIS

Figure 7 Exploded view of module box and BIS module

Item Description Order code

1 Module box (single width) 886167
2 Latch 879181
3 Spring pin 879182
4 Cross recess screw, M3×8 black 616215
5 Front panel unit 8002476
6 Membrane keypad 880101
7 Cross cylinder head screw, M3×12 628700
8 Metal frame 879184
9 Cross cylinder head screw, M3×6 61721
10 BIS interface board 8002285
11 Aspect BIS engine board 900505
12 BIS connector unit, M-BIS 8002480

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Item Description Order code

13 Front panel sticker, M-BIS, DA 8002855
13 Front panel sticker, M-BIS, DE 8002848
13 Front panel sticker, M-BIS, EN 8002555
13 Front panel sticker, M-BIS, ES 8002853
13 Front panel sticker, M-BIS, FI 8002847
13 Front panel sticker, M-BIS, FR 8002852
13 Front panel sticker, M-BIS, IT 8002850
13 Front panel sticker, M-BIS, JA 8003001
13 Front panel sticker, M-BIS, NO 8002849
13 Front panel sticker, M-BIS, NL 8002856
13 Front panel sticker, M-BIS, PT 8002854
13 Front panel sticker, M-BIS, SV 8002851

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7 EARLIER REVISIONS
Revision Manual slot/main manual Note

No previous revisions

29
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APPENDIX A, Service check form, S/5 BIS Module, M-BIS

APPENDICES A, B

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This page intentionally left blank.

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 APPENDIX A, Service check form, S/5 BIS Module, M-BIS

SERVICE CHECK FORM

BIS Module, M-BIS

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

Service check
OK N.A. Fail OK N.A. Fail
1. Check internal parts: 2. Check external parts of
the module:
3. Check the external 4. Installation
parts of DSC
5. Recognition of module

6. module software M-BIS

7. Recognition of DSC 8. Communication and
memories of module
9. membrane keys 10. Messages from BE

11. Sensor IDSensor 12. Sensor check

13. Checks with simulator Allowed range

BIS 0…1000
SQI 0…1000
SR 0…100
EMG 0…10000
14. BIS Engine errors 15. check

A-1(2)
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Datex-Ohmeda S/5 monitors

OK N.A. Fail OK N.A. Fail

16. Electrical safety check 17. Functioning after
electrical safety check
18. Final cleaning

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 800 3476-2
 APPENDIX B, How to read hex numbers, S/5 BIS Module, M-BIS

APPENDIX B, HOW TO READ HEX NUMBERS

Some status information on the BIS Module service pages are given as HEX (hexadecimal)
numbers. To understand them, please read the following:
A HEX number has a base of 16 instead of 10. This means that every character in a number can
have a value between 0 and 15. Numbers from 0 to 9 are displayed as if they were normal 10-
based numbers. Numbers from 10 to 15 are displayed with letters from a to f or A to F respectively.
Every character of a HEX number expands into a binary code of four 0:s (zeroes) and 1:s (ones) as
given in table 13. Four successive characters thus expand into four times four binary numbers.
Here's an example:
We have a HEX number F3A1. We expand the number into binary code so that we first take the four
binary digits that correspond to F, which are 1111. Then we write the four binaries that correspond
to 3 (0011) after the first four. We now have 11110011. And so on.
Eventually, we have a string of 16 binary numbers, so called bits. HEX number F3A1 corresponds to
a binary code of 1111 0011 1010 0001. Spaces are added here for legibility and to visualize the
fact that every group of four bits corresponds to one HEX character.
The bits in a binary number are numbered from right to left always starting from 0 as follows:
bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0
1 1 1 1 0 0 1 1 1 0 1 0 0 0 0 1

With this information and a table of status fields from section 5 “Service Menu” we can translate a
HEX status code into actual status messages. If a bit is 1 this means that the corresponding
status/error condition is valid, whereas a 0 means that it is not.
Table 13 HEX to binary conversion

HEX binary HEX binary

0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111

B-1(2)
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Datex-Ohmeda S/5 monitors

B-2(2)
Document No. 800 3476-2
 Datex-Ohmeda
S/5TM Remote Controller, K-REMCO (Rev. 01)
S/5TM Remote Controller, K-CREMCO
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8003934-1

January 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Remote Controller
TABLE OF CONTENTS i
Introduction 1
1 Specifications 2
1.1 Remote Controller, K-REMCO, K-CREMCO..................................................................................................2
2 Functional Description 3
2.1 Remote Controller, K-REMCO/ K-CREMCO.................................................................................................3
3 Service procedures 4
3.1 General service information.......................................................................................................................4
3.2 Service check ...........................................................................................................................................4
3.2.1 Recommended tools ........................................................................................................................4
3.2.2 Remote Controller, K-REMCO / K-CREMCO........................................................................................5
3.3 Disassembly and reassembly ....................................................................................................................7
3.3.1 Remote Controller K-REMCO / K-CREMCO.........................................................................................7
4 Troubleshooting 8
4.1 K-REMCO, K-CREMCO...............................................................................................................................8
5 Service MENU 9
5.1 Keyboard menu ......................................................................................................................................10
5.1.1 Keyboard Log .................................................................................................................................10
5.1.2 Keyboard Type ...............................................................................................................................11
6 Spare Parts 12
6.1 Remote Controller, K-REMCO ..................................................................................................................12
6.1.1 Remote Controller, K-REMCO Rev. 00, 01........................................................................................12
6.2 Remote Controller, K-CREMCO ................................................................................................................14
6.2.1 Remote Controller, K-CREMCO........................................................................................................14
7 Earlier Revisions 16
APPENDIX A 17
Service check form Remote Controller, K-REMCO, K-CREMCO............................................................................1

i
Document No. 8003934-1
 Remote Controller, K-REMCO, K-CREMCO

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Remote Controllers, K-REMCO and K-CREMCO. Remote Controllers are
designed for use with the S/5 monitors. Later in this manual the remote controllers may be refered
to without the S/5 system nomenclature for simplicity.
Please also refer to the Technical Reference Manual of the S/5 monitor for information regarding
system specific information e.g. related documentation, conventions used, symbols on equipment,
safety precautions, system description, system installation, interfacing, functional check and
planned maintenance.

The Remote Controller, K-REMCO/K-CREMCO, brings the Command Bar functions near to the user
and allows access to the same menus as the Command Bar.
• Remote Controller, K-REMCO for Anesthesia Monitor and Critical Care Monitor
• Remote Controller, K-CREMCO for Compact Monitors.

Figure 1 K-REMCO, K-CREMCO

NOTE: K-REMCO and K-CREMCO requires monitor software version 97 or greater.

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1 SPECIFICATIONS

1.1 Remote Controller, K-REMCO, K-CREMCO

Dimensions (without cable) 150 × 60 × 50 mm
Weight (incl. cable) 0.5 kg
Cable length 6m
Input voltage 5V
Power consumption 180 mW
Communication protocol RS-232
NOTE: Power supply from the display controller board only.

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2 FUNCTIONAL DESCRIPTION

2.1 Remote Controller, K-REMCO/ K-CREMCO

The Remote Controller consists of 12 direct function keys and the ComWheel.
K-REMCO/ K-CREMCO PCBs
The K-REMCO/ K-CREMCO has two PCBs located inside the Remote Controller. One board has only
the pushbutton switches of the keys. The other board reads the status of the keys and the
ComWheel and forwards the information to the CPU board.
External communication
K-REMCO Rev.00-01:
Two signals, TXD and RXD in RS232 format are in use. No handshaking is used. Serial
communication speed is 19.2 kbps.The 26-pin subminiature D-connector of the Remote Controller
is connected to the Display Controller Board, B-DISP.
K-REMCO Rev.00 with optional Remote Controller - Compact Monitor cable or
K-CREMCO Rev.00:
Two signals, TXD and RXD in RS232 format are in use. No handshaking is used. Serial
communication speed is 19.2 kbps. The DIN 5 connector is connected to keyboard connector X9.
ComWheel
The ComWheel is used for menu selection.

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3 SERVICE PROCEDURES

3.1 General service information

Field service is limited to replacing faulty PC boards or mechanical parts. The PC boards are then
returned to Datex-Ohmeda for repair.
Datex-Ohmeda Technical Services is always available for service advice. Please provide the unit
serial number, full type designation and a detailed description of the fault.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void the warranty of the
unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
• Central Unit • •
• Screwdriver • •

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3.2.2 Remote Controller, K-REMCO / K-CREMCO

• Turn the monitor to STBY.
• Disconnect the remote controller cable from the display controller board.
• Detach the remote controller upper cover and the keypad cover by removing the screws (7
pcs) from the bottom.

1. Check internal parts:

− cables are connected properly
− the remote controller cable is fastened to the bottom cover with screws
− the keypad switches are intact
− the software EPROM under the keypad is attached properly

?
2. Check external parts:
− the upper and bottom covers are intact
− the keypad cover is intact
− the ComWheel cover is intact and is attached properly

?
• Reassemble the remote controller.

3. Check the remote controller cable:

− the cable is intact
− the cable connector is intact
− the connector pins are clean, straight and at about the same height
− the locking screws inside the connector case are intact

?
• Reconnect the cable to the display controller board and on the monitor.

4. Wait until normal monitoring screen appears, then check that the picture on the screen is
displayed with correct resolution.

If the resolution is not correct, replace the remote controller cable.

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5. Enter the service menu:

Menu (on the remote controller keypad) - Monitor Setup - Install/Service (password 16-
4-34) - Service (password 26-23-8)

Take down the information regarding remote controller software.

?
• Select the menu KEYBOARD:

Service - Keyboard

6. Check the remote controller keys.

Press the keys one by one. Check that each key generates a sound from the loudspeaker.

?
7. Check the ComWheel.

Turn the ComWheel clockwise and counterclockwise and check that each step generates a
sound and the corresponding values at the bottom of the menu increase.

Select DUMMY PRESS. Press the ComWheel and check that the press generates a sound and
the corresponding value in the menu increases.

?
8. Perform electrical safety check and leakage current test.

?
9. Check that the remote controller functions normally after the performed electrical safety
check.

?
10. Clean the remote controller and the cable.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

3.3.1 Remote Controller K-REMCO / K-CREMCO

The Remote Controller is disassembled according to the following procedure.
1. Disconnect the K-REMCO/ K-CREMCO cable from the monitor.
2. Pull out the knob of the ComWheel.
3. Open the nut on the shaft of the ComWheel.
4. Open the three cross head screws on the bottom of the K-REMCO/ K-CREMCO.
5. Remove the top cover.
6. Open the four screws on the bottom of the K-REMCO/ K-CREMCO.
7. Remove the keyboard cover.
8. Disconnect the K-REMCO/ K-CREMCO cable and the wire set from the Comwheel.
9. Remove the PCBs.
The Remote Controller is reassembled by reversing the disassembly procedure. In reassembly
remember to put the reinforcing cord of the cable around the screw on the metal bridge before
tightening the screw.

Figure 2 K-REMCO, K-CREMCO disassembly and reassembly

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4 TROUBLESHOOTING

4.1 K-REMCO, K-CREMCO

See Keyboard Service Menu in chapter 5, and perform tests available. If any of the tests fail, see
explanation below.
Problem Cause Treatment
ON/STBY switch not working Keyboard cable loose or broken. D-26 Check the items. Replace them if necessary
connector pin failure. Switch leads
broken. Switch connector loose. Switch
faulty
ComWheel not working ComWheel leads broken or connector Check the items. Replace the ComWheel if
loose. ComWheel faulty. necessary
Membrane key not working Switch cable loose or broken. Keyboard Check the items. Replace them if necessary.
cable loose or broken. D-26 connector
pin failure. RS232 communication
failure on CPU board

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).

3. Select Service (password 26-23-8) - Keyboard.

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5.1 Keyboard menu

The service menu for testing the command board
functions.
Upper Led is for testing the upper alarm LED (red) on the
command board. When the text is highlighted, the upper
alarm LED can be turned on and off by pressing the
ComWheel.
Lower Led is for testing the lower alarm LED (yellow) on
the command board. When the text is highlighted, the
lower alarm LED can be turned on and off by pressing the
ComWheel.
Dummy Press is for testing the ComWheel. When the text
is highlighted, pressing of the ComWheel create a sound
from the loudspeaker and the corresponding number on
the service data field increase.

Service Data
Message count counts the number of messages that are
sent out to the main CPU board.
Leds upper and lower indicate the states of the alarm
LEDs on the command board.
Direct action keys texts are indications to the command
board membrane keys. When a key on the command
board is pressed, the corresponding text in the menu
changes its colour.
Control wheel, Press counts the ComWheel pressings.
Control wheel, Clockwise and Counterclockwise the
ComWheel turnings.
Since shows the date and the time of the last run time
reset.

5.1.1 Keyboard Log

All the keyboard presses and the commands given by the
ComWheel are recorded in the Keyboard Log. The
keyboard log is saved in the permanent memory of the
monitor. The length of the log is 1150 events. The log is
FIFO type.

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5.1.2 Keyboard Type

Store Mask A selection for setting the anaesthesia
keyboard’s language. The selected language determines
the outcome of the lower keypad.
Store Type is for setting the keyboard’s type;
COM = Command Board
ARK = Anaesthesia Keyboard
AIC = Information Center Keyboard
NOTE: The settings should be checked if the
controller board is replaced. If settings are
changed, the new settings will not be valid until
the next start-up.

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6 SPARE PARTS
NOTE: Only changed part numbers are listed under later revisions. To find the desired part: check
first the list of the revision that corresponds your device. If the part is not listed there, check the
previous revision, etc. until you find the right number.
* this part is recommended for stock
Item numbers refer to the exploded view.

6.1 Remote Controller, K-REMCO

6.1.1 Remote Controller, K-REMCO Rev. 00, 01

Item Description Order No. Replaced by
1 CPU board, K-REMCO 890368
2 Keyboard PCB, K-REMCO 890371
3 Connecting plate 891427
4 Rotary wheel 891036

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Item Description Order No. Replaced by

5 ComWheel cover 891423 898940
5 ComWheel (green) ; K-REMCO ; S/5 898940
6 Cover (Munsell N9) ; K-REMCO ; S/5 898939
6 Plastic rear cover, K-REMCO 891421 898939
7 Bottom (Munsell N9) ; K-REMCO ; S/5 898938
7 Plastic front cover, K-REMCO 891422 898938
8 Remote controller cable, K-REMCO 891813
9 Bridge for cable 893235
10 Front Panel sticker, DA ; K-REMCO (rev.00), (rev.01 ; S/5) 892203
10 Front Panel sticker, DE ; K-REMCO (rev.00), (rev.01 ; S/5) 892312
10 Front Panel sticker, EN ; K-REMCO (rev.00), (rev.01 ; S/5) 891425
10 Front Panel sticker, ES ; K-REMCO 892315
10 Front Panel sticker, FI ; K-REMCO (rev.00), (rev.01 ; S/5) 892317
10 Front Panel sticker, FR ; K-REMCO (rev.00), (rev.01 ; S/5) 892313
10 Front Panel sticker, IT ; K-REMCO (rev.00), (rev.01 ; S/5) 892316
10 Front Panel sticker, JA ; K-REMCO (rev.01) S/5 894962
10 Front Panel sticker, NL ; K-REMCO (rev.00), (rev.01 ; S/5) 892314
10 Front Panel sticker, NO ; K-REMCO (rev.00), (rev.01 ; S/5) 893553
10 Front Panel sticker, PT ; K-REMCO (rev.01) ; S/5 895233
10 Front Panel sticker; SV ; K-REMCO (rev.00), (rev.01 ; S/5) 892318
11 Front panel framework 891426
12 Slotted recess screw M2.5x22 61218
13 Cross recess PT-screw M2.5x16 628719
13 Cross recess PT-screw M2.5x16 628719
14 Cross cylinder-head screw M3x6 61721
15 Shakeproof washer m3.2 63611
16 Cable binder 546454

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6.2 Remote Controller, K-CREMCO

6.2.1 Remote Controller, K-CREMCO

No. Description Item Replaced by
1 CPU board, K-REMCO 890368
2 Keyboard PCB, K-REMCO 890371
3 Connecting plate 891427
4 Rotary wheel 891036
5 ComWheel (green) ; K-REMCO ; S/5 898940
6 Cover (Munsell N9) ; K-REMCO ; S/5 898939
7 Bottom (Munsell N9) ; K-REMCO ; S/5 898938
8 K-Remco - CM cable 891965
9 Bridge for cable 893235
10 Front Panel sticker, DA ; K-REMCO (rev.00), (rev.01 ; S/5) 892203
10 Front Panel sticker, DE ; K-REMCO (rev.00), (rev.01 ; S/5) 892312
10 Front Panel sticker, EN ; K-REMCO (rev.00), (rev.01 ; S/5) 891425
10 Front Panel sticker, ES ; K-REMCO 892315
10 Front Panel sticker, FI ; K-REMCO (rev.00), (rev.01 ; S/5) 892317

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No. Description Item Replaced by

10 Front Panel sticker, FR ; K-REMCO (rev.00), (rev.01 ; S/5) 892313
10 Front Panel sticker, IT ; K-REMCO (rev.00), (rev.01 ; S/5) 892316
10 Front Panel sticker, JA ; K-REMCO (rev.01) S/5 894962
10 Front Panel sticker, NL ; K-REMCO (rev.00), (rev.01 ; S/5) 892314
10 Front Panel sticker, NO ; K-REMCO (rev.00), (rev.01 ; S/5) 893553
10 Front Panel sticker, PT ; K-REMCO (rev.01) ; S/5 895233
10 Front Panel sticker; SV ; K-REMCO (rev.00), (rev.01 ; S/5) 892318
11 Front panel framework 891426
12 Slotted recess screw M2.5x22 61218
13 Cross recess PT-screw M2.5x16 628719
13 Cross recess PT-screw M2.5x16 628719
14 Cross cylinder-head screw M3x6 61721
15 Shakeproof washer m3.2 63611
16 Cable binder 546454

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7 EARLIER REVISIONS
No earlier versions

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Appendices A,Service check form, K-REMCO, K-CREMCO

APPENDIX A

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 Appendices A,Service check form, K-REMCO, K-CREMCO

Service check form

Remote Controller, K-REMCO, K-CREMCO

Customer

Service Keyboard type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. Cable 4. Monitor picture

Notes

5. Stand by -LED

6. Command board KB
software
7. Alarm LEDs 8. Membrane keys

9. ComWheel

Notes

10. Electrical safety check 11. Functioning after

electrical safety check
12. Final cleaning

Notes

Used Spare Parts

Signature

A-1(1)
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Document No. 8003934-1
 Datex-Ohmeda
S/5TM Single-width Airway Module

Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8003487-3

October 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
www.us.datex-ohmeda.com
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5 Single-width Airway Modules
TABLE OF CONTENTS I
TABLE OF FIGURES II
INTRODUCTION 1
1 SPECIFICATIONS 2
1.1 General specifications ..............................................................................................................................2
1.2 Typical performance .................................................................................................................................2
1.2.1 CO2 ..................................................................................................................................................2
1.3 Gas specifications ....................................................................................................................................2
1.3.1 Normal conditions ............................................................................................................................3
1.3.2 Conditions exceeding normal ............................................................................................................3
2 FUNCTIONAL DESCRIPTION 4
2.1 Measurement principle .............................................................................................................................4
2.1.1 CO2 measurement ............................................................................................................................4
2.2 Main components.....................................................................................................................................5
2.2.1 Gas sampling system........................................................................................................................5
2.2.2 MiniCO2 measuring unit ....................................................................................................................7
2.2.3 CPU board .......................................................................................................................................8
2.3 Connectors and signals.............................................................................................................................8
3 SERVICE PROCEDURES 9
3.1 General service information.......................................................................................................................9
3.1.1 MiniCO2 measuring unit ....................................................................................................................9
3.1.2 Serviceable or exchangeable parts....................................................................................................9
3.2 Service check .........................................................................................................................................10
3.2.1 Recommended tools ......................................................................................................................10
3.2.2 Recommended parts ......................................................................................................................10
3.3 Disassembly and reassembly..................................................................................................................14
3.3.1 Pump unit ......................................................................................................................................14
3.3.2 MiniCO2 assy..................................................................................................................................15
3.3.3 Instructions after replacing MiniCO2 assy .........................................................................................15
3.4 Adjustments and calibrations..................................................................................................................16
3.4.1 Gas sampling system adjustment....................................................................................................16
3.4.2 Flow rate measurement ..................................................................................................................16
3.4.3 Flow rate adjustment ......................................................................................................................16
3.4.4 Gas calibration...............................................................................................................................16
4 TROUBLESHOOTING 17
4.1 Troubleshooting charts............................................................................................................................17
4.1.1 CO2 measurement ..........................................................................................................................18
4.2 Gas sampling system troubleshooting .....................................................................................................19
4.2.1 Sampling system leak test ..............................................................................................................19
4.3 MiniCO2 measuring unit troubleshooting ..................................................................................................19
4.4 CPU board troubleshooting .....................................................................................................................19

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4.5 Error messages.......................................................................................................................................20

5 SERVICE MENU 21
5.1 General menu ........................................................................................................................................22
5.2 Gases service menu ...............................................................................................................................23
6 SPARE PARTS 24
6.1 Spare parts list .......................................................................................................................................24
6.1.1 M-miniC ........................................................................................................................................24
7 EARLIER REVISIONS 25
APPENDIX A 27
SERVICE CHECK FORM A-1

TABLE OF FIGURES
Figure 1 Absorbance of CO2 ...............................................................................................................................4
Figure 2 Gas tubing layout ................................................................................................................................. 6
Figure 3 MiniCO2 block diagram......................................................................................................................... 7
Figure 4 MiniCO2 measuring unit........................................................................................................................ 7
Figure 5 Module bus connector pin layout .......................................................................................................... 8
Figure 6 Disassembling the M-miniC module....................................................................................................14
Figure 7 Uncovered M-miniC module ...............................................................................................................15
Figure 8 Exploded view of M-miniC...................................................................................................................24

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 Single width Airway module

INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Single-width Airway Module, M-miniC. The Single-width Airway Module is a
single-width plug-in module designed for use with the S/5 monitors. Later in this manual the
module can be called w/o the system name Datex-Ohmeda S/5.
Please also refer to theTechnical Reference Manual of the S/5 monitor for information regarding
system specific information e.g. related documentation, conventions used, symbols on equipment,
safety precautions, system description, system installation, interfacing, functional check and
planned maintenance.
The Single-width Airway Module provides airway and respiratory measurements.
Letters in the module name stand for:
M = plug-in module, C = CO2
NOTE: Do not use identical modules in the same monitor simultaneously. The M-C, M-CO, M-COV,
M-COVX, M-CAiO, M-CAiOV, M-CAiOVX , M-CAiOVX/SERVICE and M-miniC are considered identical
modules.
NOTE: The Single-width Airway Module or Compact Airway Module and Airway Module, G-XXXX,
cannot be used simultaneously in the same monitor.
NOTE: M-miniC is intended for patients weighing over 5kg (11lb).

NOTE: The Single-width Airway Module, M-miniC is designed for use with L-ANE02(A), L-ICU02(A),
L-CANE02(A), L-CICU02(A) or later versions respectively.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 37 × 208 × 111 mm, 1.5 × 8.2 × 4.4 in
Module weight 400 g/1,1 lbs
Power consumption 1.5 W Prms, 2.3 W momentary

Environmental specifications

Operating temperature +10...+40 °C

Storage temperature -25...+70 °C
Atmospheric pressure 666...1060 hPa /
(67...106 kPa)
(500...800 mmHg)
(666...1060 mbar)
Humidity 10...95 % non-condensing (in airway 0...100 %, condensing)
Protection against electrical shock Type BF

1.2 Typical performance

1.2.1 CO2
Measurement range 0...20 vol% (0...20 kPa, 0...150 mmHg)
Measurement rise time < 300 ms with nominal flow
Accuracy ( 0…15 vol%) ±(0.2 vol% +2 % of reading)
(15…20 vol%) ±(0.7 vol% +2 % of reading)
If CO2 concentration is below 0.1%, 0.0% is displayed.

1.3 Gas specifications

Airway humidity 0...100 %, condensing
Sampling rate 150 ±25 ml/min. (sampling line 2 to 3 m, normal conditions)
Sampling delay 2.1 seconds typical with a 3-m sampling line
Total system response time 2.4 seconds typical with a 3-m sampling line, including sampling
delay and rise time (typically 3.7 seconds with a 6-m sampling line)
Display update rate breath-by-breath
Automatic compensation for pressure, CO2-N2O and CO2-O2 collision broadening effect
compensation selectable from menu.
Warm up time 1 min for operation with CO2
30 min for full specifications
Autozeroing interval Immediately after ‘calibrating gas sensor’ and 2, 7, 12, 17,
32, 47, 62 minutes after start-up, then every 60 minutes

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 Single width Airway module

1.3.1 Normal conditions

Accuracy specifications apply in normal conditions (after 30 minutes warm-up period):
Ambient temperature 18...28 °C, within ±5 °C of calibration
Ambient pressure 500...800 mmHg, ±50 mmHg of cal.
Ambient humidity 20...80 % RH, ±20 % RH of cal.
Non-disturbing gases are those with a maximum effect on the CO2 reading < 0.2 vol %. The effect
is valid for specific concentrations shown in parentheses of the non-disturbing gas:
− Ethanol C2H5OH (< 0.3 %)
− Acetone (< 0.1 %)
− Methane CH4 (< 0.2 % )
− Nitrogen N2
− water vapor
− Trichloromonofluoromethane (<1 %)
− Dichlorotetrafluoroethane (<1 % )
− Dichlorofluromethane (<1 % )
Disturbing gases and their effect on the CO2-reading at 5.0 vol% CO2 are shown below. Errors listed
reflect the effect of specific concentrations (shown in parentheses) of an individual disturbing gas
and should becombined when estimating the effect of gas mixtures:
− Halotane (4%) increases < 0.3 vol%
− Isoflurane (5%) increases < 0.4 vol%
− Enflurane (5%) increases < 0.4 vol%
− Desflurane (24%) increases < 1.2 vol%
− Sevoflurane (6%) increases < 0.4 vol%
− Helium (50%) decreases < 0.3 vol%

If O2 compensation is not activated: Oxygen (40 … 95%) decreases < 0.3 vol%
If O2 compensation is activated: Oxygen (40 … 95%) error < 0.15 vol%
If N2O compensation is not activated: N2O (40%) increases < 0.4 vol%
N2O (40 to 80%) increases < 0.8 vol%
If N2O compensation is activated: N2O (40 to 80%) error < 0.3 vol%

1.3.2 Conditions exceeding normal

Accuracy specifications under the following conditions ŒŽ:
Œ Ambient temperature 10...40 °C, within ±5 °C of calibration
Ambient pressure 500...800 mmHg, ±50 mmHg of calibration
Ambient humidity 10...98 % RH, ±20 % RH of calibration
 During warm-up 1 to 10 minutes, under normal conditions
Ž During warm-up 10 to 30 minutes, under normal conditions
Accuracy under different conditions (see above)
Conditions Œ and Ž Condition 
CO2 ( 0 … 15 vol%) ±(0.3 vol% + 4 % of reading) ±(0.4 vol% + 7 % of reading)
(at 5 vol% error ±0.5 vol%) (at 5 vol% error ±0.75 vol%)
CO2 (15 … 20 vol%) ±(0.8 vol% + 4 % of reading) ±(0.9 vol% + 7 % of reading)
(at 5 vol% error ±0.5 vol%) (at 5 vol% error ±0.75 vol%)

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2 measurement

MiniCO2 is a side stream gas analyzer, measuring real time concentrations of CO2. It is a
nondispersive infrared analyzer, measuring absorption of the gas sample using optical narrow
band filter.
The infrared radiation detector is thermopile.
Concentration of CO2 is calculated from absorption measured at 4.2 ... 4.3 µm.

Figure 1 Absorbance of CO2

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2.2 Main components

The Single-width Airway Module consists of:
• Gas sampling system
• miniCO2 measuring unit
• CPU board

2.2.1 Gas sampling system

The sampling system draws a gas sample to the analyzer at a fixed rate.
The gas sampling system samples the measured air to the module, and removes water and
impurities from it. A sampling line is connected to the water trap. The pump draws gas through the
sampling line to the gas measuring unit. After the measurement, the gas is exhausted from the
sample gas out connector.
The sample flow is nominally 150 ml/min.

Mini D-fendTM
The sample is drawn through the sampling line. The gas then enters the module through the water
trap, where it is divided into two flows, a main flow and a side flow. The main flow goes into the
analyzer. This flow is separated from the patient side by a hydrophobic filter. The side flow creates
a slight subatmospheric pressure within the Mini D-fend water trap which causes fluid removed by
the hydrophobic filter to collect in the bottle.

Zero valve
The main flow passes through a magnetic valve before proceeding to the analyzer. This valve is
activated to establish the zero point for the miniCO2 measuring unit. When the valve is activated,
room air is drawn through a filter into the internal system and the gas sensor.

NafionTM tube 1)
A nafion tube is used between the water trap and the zero valve to balance the sample gas
humidity with that of ambient air. The tube prevents errors caused by the effect of water vapor on
gas partial pressure when humid gases are measured after calibration with dry gases.

Gas analyzers
After the zero valve and nafion tube the gas passes through miniCO2 measuring unit.

Sample flow differential pressure transducer

The sample flow differential pressure transducer measures pressure drop across a restrictor and
calculates the sample flow from the pressure difference.

1)
Nafion is a trademark of Perma Pure Inc.

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Working pressure transducer

The working pressure transducer measures absolute working pressure near the miniCO2 measuring
unit. The following messages are based on the obtained pressure values: ‘sample line blocked’,
‘check D-fend’, ‘replace D-fend’ and ‘check sample gas outlet’.

Sampling pump and damping chamber

The gas sampling pump is a membrane pump run by a DC-motor. Sample flow is measured with a
differential pressure transducer across a known restriction. The motor is automatically controlled to
maintain a constant flow even when the D-fend water trap ages and starts to get occluded. It also
enables use of sample tubes with varying lengths and diameters.
NOTE: In no occasion is the flow reversed towards patient.

Side flow
Mini Sample line
Main flow D-fend

Filter Room air

Zero
valve

Mini CO2

Abs. Pressure
Sensor

Diff. Pressure
Sensor

Pump

Gas out

Figure 2 Gas tubing layout

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Mini-CO2 Unit
D-
fend Sample line
Mainflow

Air
Zero Valve

Control of the Flash

CO2 Lamp Current Prog.
Bench Amplification
including
lamp Temperature RS485
Amplification Multiplexer 16-bit A/D serial
converter interface
Lamp Current
Amplification
HD64F-
Reset M
Abs. Pressure Abs. Pressure 3048
EEPROM o
Sensor Filtering 512 bytes d
u
Diff. Pressure Diff. Pressure RAM l
Sensor Amplification 32 kbytes e

B
Control of the DAC u
Pump
Pump Voltage s

Pump Voltage ADC

Filtering

VDD
P5VA Power
VREF-2.5 Supply

Gas out

Figure 3 MiniCO2 block diagram

2.2.2 MiniCO2 measuring unit

The miniCO2 measuring unit is a non-dispersive infrared analyzer measuring absorption of the gas
sample at 4.2 ... 4.3 µm infrared wavelength, which is selected using an optical narrow band filter.
The IR lamp is a filament surrounded by thermal isolation. There is a hole in the isolation, passing
the radiation to a conical measuring chamber with 3 mm length. From the sample chamber, the
radiation goes into a thermopile detector with an optical filter in front of it.
The temperature sensor measures miniCO2 measuring unit's temperature and it is used for
temperature compensation.
The miniCO2 measuring unit includes miniCO2 flexible board which connects the thermopile signal
and the temperature sensor signal to the CPU board.

Figure 4 MiniCO2 measuring unit

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2.2.3 CPU board

CPU board contains the processor, memories and all the analog signal processing needed.
MiniCO2 measuring unit is attached to the board with a flexible PCB. Also supply voltage and
RS485 serial channel are connected to the CPU board using another flexible PCB.
Analog signals (CO2, temperature, absolute and differential pressure and lamp current signals) are
fed through a multiplexer to the 16-bit A/D-converter. The processor controls the A/D-converter
and calculates the CO2 percentage and respiration rate from this data.
The processor controls sample flow by adjusting pump voltage based on the differential pressure
signal. The processor also controls the current of the IR source and keeps it constant.
Calibration data is stored on the eeprom.

2.3 Connectors and signals

13 1
25 14

Figure 5 Module bus connector pin layout

Table 1 Module bus connector pin description

Pin No I/O Signal

1 I RESET RS485
2 I -15 VDC (not used)
3 I +15 VDIRTY
4 I +15VDC (not used)
5 I/O -DATA RS485
6 I/O DATA RS485
7 Ground and Shield
8 I -RESET RS485
9 n/c
10 n/c
11 n/c
12 n/c
13 Ground and Shield
14 I +24/+32 VDIRTY depends on power supply (not used)
15 I Ground DIRTY
16 n/c
17 n/c
18 n/c
19 n/c
20 I GASFR (not used)
21 I CTSD (not used)
22 I TXDD (not used)
23 O RXDD (not used)
24 I +5 VDC (not used)
25 I +5 VDC DIRTY (not used)

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the Single-width Airway Module is limited to replacing faulty circuit boards or
mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please, provide the unit serial number, full
type designation and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

CAUTION The module electronics can only be repaired and calibrated at the factory.

3.1.1 MiniCO2 measuring unit

CAUTION The miniCO2 measuring unit and its components are repaired/calibrated at the
factory. Attempts to repair/calibrate the unit elsewhere will adversely affect
operation of the unit. The information provided is for reference only.

3.1.2 Serviceable or exchangeable parts

• Mini D-fend
• Mini D-fend O-rings
• Nafion tube
• Zero valve
• Modflex board
• Air filter
• Pump
NOTE: After any component replacement see chapter Adjustments and calibrations.
Calibration interval 6 months. Preventive maintenance once a year including change of Nafion tube
and O-rings of water separator, pump check and calibration, leak test, absolute pressure sensor
check.

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3.2 Service check

These instructions include complete procedures for a service check. The service check is
recommended to be performed after any service repair. However, the service check procedures can
also be used for determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, Appendix A, which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Screwdriver Pozidrive, medium size
Ambient pressure manometer Amb. Press. can be checked from local meteorological station
Flowmeter TSI model 4140 recommended
Flow cassette 50/1.1 873812
Extra silicon tubing 73375
Calibration gas and the regulator 755580 (gas) Contains 5% CO2 and air
755534*
Gas Interface Cable 2.5 m 884299
*NOTE: Ensure that the calibration gas and regulator are functioning properly before calibration.
Perform annual maintenance on the regulator as required. For more information see Adjustments
and calibrations chapter of Compact Airway modules slot.

3.2.2 Recommended parts

Part Order No. Notes
Mini D-fend 8002174 Pkg of 10 pieces
Sampling line 3 m/10 ft 73319 Pkg of 10 pieces
Mini D-fend O-ring (2 pcs) 656565
Nafion tube 733382

Detach the module box by removing the two screws from the back of the module. Be careful with
loose latch and spring pin for locking.
1. Check internal parts:
− all screws are tightened properly
− all cables are connected properly
− tubes are not pinched and there are no sharp bends on them
− all tubes are connected properly
− there are no loose objects inside the module

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2. Check external parts:

− the front cover and the front panel stickers are intact
− all connectors are intact and are attached properly
− the Mini D-fend latch is moving properly
− the module box, the latch and the spring pin are intact

?
3. Detach the Mini D-fend. Check the condition of the rubber O-rings on the metal Mini D-fend
connectors, located in the module front cover.
If necessary, detach the connectors by first disconnecting the tubes, then removing the
locking rings from the back of the front cover.
NOTE: The O-rings should be replaced annually.

• Replace the Mini D-fend and sampling line with new ones.
NOTE: Use only Datex-Ohmeda sampling lines in order to ensure proper functioning.
Connect the Single-width Airway Module to the Central Unit’s Module motherboard using
the Gas interface cable (the grounding plates of the cable should be removed).
Turn on the monitor.
Configure the monitor screen so that CO2 curve is shown, for example as follows:
Monitor Setup - Screen 1 Setup - Waveform fields -
Field 6 - CO2
Digit Fields
Lower Field 1 - Gases
4. Wait until the message ‘Calibrating gas sensor’ disappears from the screen, then enter the
Service menu.
Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8).
Write down the information regarding the Single-width Airway Module software.

?
5. Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second.
If one of the values is increasing faster, it indicates a failure in module bus communication.

?
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6. Enter the service menu Gases:

Gas Unit - Gases

Check that the flow measurement offset, i.e. the shown sample ‘Zero’ value is within ±10
ml/min.

?
7. Check that the shown ‘Ambient’ value corresponds with the current ambient pressure (±20
mmHg).

?
8. Check the zero valve.
Feed calibration gas and check that the gas readings in the service menu correspond with
the values on the gas bottle sticker. Keep feeding gas, then activate the zero valve from the
menu. The CO2 reading should drop back to near 0 %.

?
9. Perform the steam test for the Nafion tube, or replace it by a new one.
NOTE: The Nafion tube should be replaced annually.

?
10. Perform sampling system leak test.

Connect a flow cassette with high flow resistance value (50/1.1) to the end of the sampling
line and start following the ‘Amb-Work’ value in the service menu. When the value exceeds
130 mmHg connect the other port of the flow cassette to the sample gas out connector and
switch off the pump.
Wait until the pressure inside the sampling system is stabilized, then observe the shown
‘Amb-Work’ value. The value, i.e. the pressure inside the sampling system should not drop
more than 6 mmHg in 20 seconds.

If the pressure drops more, first check connections and repeat the test.

?
11. Check the flow rates.

Wait until the ‘Sample Flow’ value returns close to 150 ml /min.
Connect a flowmeter to the 3 meter sampling line and check that the flow (the flowmeter
reading) is within the following range:

Sampling flow (ml/min) –135…165

If necessary, readjust the sampling flow:

Select ‘Sample gain adj’ from the menu.
To increase the sampling flow, turn the ComWheel counterclockwise,
to decrease the flow, turn the ComWheel clockwise.
A change of 0.050 in the ‘Gain’ value changes the flow approximately 7.5 ml/min.

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After you have changed the gain, wait until the ‘Sample Flow’ value on the screen returns
near to the original, then check the flowmeter reading again.

?
12. Check that the ‘Amb-Work’ value in the service menu is within the following range:

Amb-Work (mmHg) 20...50

?
13. Perform the gas calibration.

Airway Gas - Gas Calibration

NOTE: The calibration should not be performed before 30 minutes warm-up time.
Use calibration gas 755580 (5 % CO2, about 20 % O2) for calibrating the M-miniC.

?
Turn off the monitor, disconnect the Gas interface cable and reassemble the module.

NOTE: When reassembling the module, make sure that the tubes are not pinched between the
module box and internal parts.
Install the Single-width Airway Module into the Central Unit, turn on the monitor and wait until the
message ‘Calibrating gas sensor’ disappears from the screen.
14. Block the tip of the sampling line with your finger and check that the message ‘Sample line
blocked’ appears on the monitor screen within 60 seconds.

?
15. Detach the mini D-fend and check that the message ‘Check D-fend’ appears on the monitor
screen within 30 seconds.

?
16. Reattach the mini D-fend. Simulate at least 5 breaths by feeding calibration gas into the
sampling line. Check that the shown gas information is correct.
Check that the monitor shows the message ‘Apnea’ within 30 seconds after you have
stopped feeding the gas.

?
17. Turn off the monitor, disconnect and clean the module.

?
• Fill in all necessary documents.
• It is recommended to fill in the PM sticker since the service check includes all the
Planned Maintenance actions. Attach it to a suitable place on the module box.

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3.3 Disassembly and reassembly

Disassemble the airway module in the following way. See also the exploded view of the module.
1. Remove two screws from the back of the module.
2. Pull the module box slowly backwards and detach it from the main body.
Reassembling is essentially reversing what was described above.

CAUTION When reassembling the module, make sure that the tubes and cables are not
pinched between the boards and the cover.

Figure 6 Disassembling the M-miniC module

3.3.1 Pump unit

1. Remove the module cover.
2. Remove the mask.
3. Unplug the hose of the pump.
4. Disconnect the pump’s cable from the CPU board.
5. Remove the three screws that connect the pump unit to the board.
6. Reassembling is essentially reversing what was described above.

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Figure 7 Uncovered M-miniC module

3.3.2 MiniCO2 assy

1. Remove the module cover.
2. Unplug two tubes from the back of the mask.
3. Remove mask.
4. Detach the miniCO2 assy from the frame plate by removing three screws.
5. Disconnect the flexible board from the miniCO2 assy.
6. Reassembling is essentially reversing what was described above.

3.3.3 Instructions after replacing MiniCO2 assy

After replacing the MiniCO2 assy:
• perform the sampling system leak test
• perform the occlusion test
• perform the gas calibration

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3.4 Adjustments and calibrations

See the User’s Reference Manual for normal gas calibration instructions.

3.4.1 Gas sampling system adjustment

For the flow rate measurements a flowmeter with a low flow resistance and capability to measure
low flow rates is required. A normal length of sampling line has to be connected to the monitor as it
has a considerable effect on the flow.

3.4.2 Flow rate measurement

If any flow rates are not correct, first replace the Mini D-Fend water trap. Then recheck the
flows.
Sampling flow rate is measured by a rotameter at the sampling line. The flow rate should be
between 135 and 165 ml/min. The flow rate is adjusted in the Gas Service Menu with ‘Sample
Gain Adj.’.

3.4.3 Flow rate adjustment

NOTE: Before adjusting the sampling flow make sure there is no leakage in the sampling system.
Refer to chapter 3.2 Service check, step 11:
Wait until the ‘Sample Flow’ value is back to near 150 ml /min.
Connect a flowmeter to the 3 meter sampling line and check that the flow (the flowmeter reading) is
within the following range:

Sampling flow (ml/min) 135…165

If necessary, readjust the sampling flow:

Select ‘Sample gain adj’ from the menu.
To increase the sampling flow, turn the ComWheel counterclockwise,
to decrease the flow, turn the ComWheel clockwise.
A change of 0.050 in the ‘Gain’ value changes the flow approximately 7.5 ml/min.
After you have changed the gain, wait until the ‘Sample Flow’ value on the screen returns near to
the original, then check the flowmeter reading again.

3.4.4 Gas calibration

Gas calibration is performed in the Airway Gas menu. Please refer to the User’s Reference Manual.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

Trouble Possible cause/treatment
No response to breathing Sampling line or water trap blocked or loose, or improperly attached.
Water trap container full.
See the gas sampling system troubleshooting.
SENSOR INOP. -message The temperature is too low or high, check temperature in the service menu.
Supply voltage is too low or high, IR source current or voltage is too low or
high, check current in the service menu.
Pump is not working properly, check sample flow and pump voltage in the
service menu.
Ambient pressure too low or high, check the ambient pressure in the service
menu.
Zero valve not working properly, check the functionality by switching zero
valve on and off in the service menu.
ZEROING ERROR -message Gas zeroing failed. Condensation or residual gases are affecting the zero
measurement. Allow module to run drawing room air for a half an hour and
calibrate again.
CHECK D-FEND -message Amb – Work pressure difference too small.
Probably water trap or the sampling line is not attached properly. Gas zero
valve failure. Pump failure or gas outlet blockage.
REPLACE D-FEND -message Amb – Work pressure difference too big.
Indicates residue build-up on the water trap membrane. This decreases air
flow. Replace the D-fend.
SAMPLE LINE BLOCKED -message Amb – Work pressure difference too big.
Sampling line or water trap is occluded. Water trap container is full. If
occlusion persists, check internal tubing for blockages.
No response to any gas Sampling line, water trap, or internal tubing blocked or loose, or improperly
attached.
Zero valve malfunction. Pump failure. Supply voltage missing. Serial
communication error.

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Trouble Possible cause/treatment

Sudden increase in gas display Water trap malfunction. Check all internal tubing and the interior of the water
trap for occlusions or leaks. Replace water trap. Check flow rates.
Abnormally high (or abnormally low) Pressure transducer failure. Check the Ambient and Amb – Work pressures
response to CO2 in ‘Gases’ service menu.
or sudden occlusion warning
Strong drift in all gases Leak in sampling line or internal tubing (especially in conjunction with too
low readings).

4.1.1 CO2 measurement

Trouble Possible clinical cause Possible technical cause Action
too low ETCO2 value • sudden decrease in • leak in sampling system • check all connections
circulation
• calibration error • check calibration
• pulmonary embolism
• high by-pass flow from
• hyperventilation ventilator
• very large dead-space
• large shunting
too high ETCO2 • hypoventilation • D-fend contaminated • change D-fend
• increased metabolism • calibration error • check calibration
waveform clipped • - • incorrect scaling • change scale
no response to • apnea • sampling line or water • check all connections
breathing trap loose or blocked (air
• (disconnection)1) 1)
leak)
• sample gas outlet blocked • check that outlet is
open
ETCO2 overscale • abnormally high ETCO2 • CO2 sensor contaminated • let the module run
>20% (permissive hypercapnia) without a sampling
• D-fend malfunction
line until CO2 sensor
Shown until 32 %,
has dried out
specified range
0...20 % • change D-fend
ETCO2>PaCO2 • unit is mmHg or kPa and • “dry gas” as default • change to “wet gas”
ETCO2 is close to arterial by using
PCO2 install/service menu

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4.2 Gas sampling system troubleshooting

The faults which can occur in the sampling system are: leaks or blockages in the tubing, failure of
the sampling pump or the magnetic valves, or diminishing of the flow rates because of dirt
accumulating in the internal tubing.
The following checks should help in localizing the fault. Whenever suspecting the sampling system
and always after having done any work on the sampling system check and if necessary adjust the
flow rate.

CAUTION The special internal sample tube is mechanically fragile. Sharp bends will cause
leaks.
NOTE: D-fend water trap should be replaced when the REPLACE D-FEND message appears during
the monitor startup.
NOTE: If any liquid has entered the miniCO2 measuring unit due to water trap filter failure, leave the
module running without a sampling line for several hours and check the functions after it has dried
out.

4.2.1 Sampling system leak test

1. Connect a flow cassette with high flow resistance value (50/1.1) to the end of the sampling
line and start following the ‘Amb-Work’ value in the service menu. When the value exceeds
130 mmHg connect the other port of the flow cassette to the sample gas out connector and
switch off the pump.
2. Wait until pressure inside the sampling system is stabilized, then observe the shown ‘Amb-
Work’ value. The value, i.e. the pressure inside the sampling system, should not drop more
than 6 mmHg in 20 seconds.
3. If the pressure drops more, first ensure the connections you have made and repeat the test.

4.3 MiniCO2 measuring unit troubleshooting

CAUTION The miniCO2 measuring unit can only be repaired and calibrated at the factory. In
case of failure, the complete miniCO2 assy should be sent to Datex-Ohmeda for
factory exchange.

4.4 CPU board troubleshooting

The CPU board can not be repaired in the field.
Check only that all connectors are properly attached.

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4.5 Error messages

Message Explanation
Occlusion or Sample Line Blocked The sample tube inside or outside the monitor is blocked or
water trap is occluded. If occlusion persists, measured gas
values disappear.
Continuous occlusion. Check sample line and Occlusion over 40 seconds.
D-fend.
Check D-fend -the water trap is not connected
-there is a leak in the sampling line inside the module. If air leak
persists, measured gas values disappear.
Check sample gas out.
(Air leak detected.) Check water trap and sample Air leak over 40 seconds.
gas out-flow. Press normal screen to continue.
Replace D-fend (replace water trap) Indicates residue build-up on the water trap membrane. This
decreases air flow.
Gas calibration is not available during first 5 Entering calibration is not allowed during 5 minutes after power
minutes/during occlusion/during air leak up and during occlusion or air leak.
Gas out blocked - Gas out connector on the front panel, or the exhaust line
connected to it, is blocked.
- If the sample gas is returned to patient circuit the filter in the
return kit may be occluded.
- Make sure the sample gas outlet is connected to an open
scavenging system only where gas is removed in room
pressure.
Recalibration Time out, fluctuating gases, gain adjusted “over”.
Zero error Unsuccessful zeroing.
Unstable, Calibr error Unsuccessful calibration.
Menu messages during calibration:
Zero error Unsuccessful zeroing
Adjust Calibration gas accepted and monitor is ready for adjusting the
gas values to match the calibration gas concentration
Unstable Unsuccessful calibration

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Press the Monitor Setup key - select Install/Service (password: 16-4-34) - select Service
(password: 26-23-8) - select Parameters - select Gas Unit.

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5.1 General menu

Service Data field

Module configuration shows which measurement options are available, i.e. are detected by the
module.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure or module not in place. Also other modules can cause these
numbers to rise.

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5.2 Gases service menu

Noise Meas A selection for activating the noise measurement.

Sample gain adj A selection for adjusting the sampling pump gain, i.e. for for adjusting the sample flow measurement.
Pump ctrl A manual control for the sampling pump.
Zero valve ctrl A manual control for the zero valve.
Record Data Record Data prints out the shown service data and board information (id. serial number and software id.) onto the
recorder module (if installed).
Service Data field
O2, CO2, N2O, AA % -field shows realtime concentrations, noise-% is standard deviation of concentration.
O2, CO2, N2O, AA channels A-E
mV -field: signal is scaled to mV, Gain: User gain. It is scaled as (User gain)/(Factory gain).
ID Shows the identified agent. Not used in M-miniC.
ID unrel. The shown value tells how unreliable the identification is. With pure agent, the value is normally < 50. Not used in M-
miniC.
Sample Flow Sample Flow is calculated from differential pressure and is adjusted by the module. Zero value as measured during
initialization when the pump is off. Gain: sample flow measurement can be calibrated by adjusting the gain.
Ambient Ambient pressure is measured during initialization and every auto-zeroing. Amb-Work: ambient pressure - sampling
system internal pressure.
CO2-O2 Delay In ms. No delay between CO2, N2O, and agents. Not used in M-miniC.
Pump Can be toggled ON/OFF.
DHC output 0-1.78% is shown. Pump voltage is also shown.
Lamp The state, PWM control, and current of the lamp are shown.
Zero and Occl valve
Can be toggled between measurement state (MEAS) and zeroing/occlusion states (ZERO/OCCL).
Temp Temperatures measured by the module from miniCO2 measuring unit (in the display: TPX).
Time after power on
In minutes after power on.

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6 SPARE PARTS

6.1 Spare parts list

6.1.1 M-miniC

Figure 8 Exploded view of M-miniC

Item Description Order No. Item Description Order No.

Mini-CO2 unit 8001645 8 Frame for MiniCO2 8002145
1 O-ring 656565 9 Tube unit 8000574
2 a,b Front panel stickers 8003140 10 Magnetic valve 585714
2 a,b Front panel stickers USA M1006287 11 Air filter 571421
3 Screw (for module box) 61621 12 Pump unit 8000573
4 Module box 886167 13 Front plate unit 8001647
5 Latch for module box 879181 14 Connector (Mini D-fend tube connector) 8002173
6 Spring pin for module box 879182 15 Nafion tube 733382
7 Modflex board 8002231

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7 EARLIER REVISIONS
Revision Manual slot/main manual Note
No earlier revisions

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APPENDIX A, Service check form, S/5 Single width Airway module

APPENDIX A

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SERVICE CHECK FORM

Single-width Airway Module M-miniC
Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. D-fend O-rings

Notes

OK N.A. Fail OK N.A. Fail

4. Module software GAS
5. Module bus
communication
6. Flow measurement offset ±10 ml/min
7. Ambient pressure 8. Zero valve

9. Special tube,
(Nafion)
10. Leak test ≤ 6 mmHg/20 sec
11. Flow rates

Sampling flow 135...165 ml/min

A-1(2)
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OK N.A. Fail OK N.A. Fail

12. Working pressure
Amb-Work 20...50 mmHg
13. Gas calibration

14. Occlusion detection 15. 'Check D-fend'

16. Apnea detection 17. Final cleaning

Notes

Used Spare Parts

Signature

A-2(2)
Document No. 8003487-3
 Datex-Ohmeda
S/5TM Entropy Module, M-ENTROPY (Rev. 00)
Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8004390

January 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
Entropy Module, M-ENTROPY
TABLE OF CONTENTS I
TABLE OF FIGURES II
INTRODUCTION 1
1 SPECIFICATIONS 3
1.1 General specifications ..............................................................................................................................3
1.2 Technical specifications............................................................................................................................3
1.2.1 EntrEEG ...........................................................................................................................................3
1.2.2 Impedance measurement.................................................................................................................3
2 FUNCTIONAL DESCRIPTION 4
2.1 Measurements principle ...........................................................................................................................4
2.1.1 EntrEEG ...........................................................................................................................................4
2.1.2 FEMG...............................................................................................................................................4
2.1.3 RE and SE ........................................................................................................................................4
2.1.4 Impedance measurement.................................................................................................................5
2.2 Main components.....................................................................................................................................5
2.3 Connectors and signals.............................................................................................................................6
2.3.1 Module bus connector ......................................................................................................................6
2.3.2 Module front panel connector ...........................................................................................................6
3 SERVICE PROCEDURES 7
3.1 General service information.......................................................................................................................7
3.2 Service check ...........................................................................................................................................7
3.2.1 Recommended tools ........................................................................................................................7
3.3 Disassembly and reassembly....................................................................................................................9
3.3.1 M-ENTROPY......................................................................................................................................9
4 TROUBLESHOOTING 11
4.1.1 Troubleshooting chart .....................................................................................................................11
4.1.2 Troubleshooting flowcharts .............................................................................................................12
5 SERVICE MENU 13
5.1 Entropy service menu..............................................................................................................................14
6 SPARE PARTS 16
6.1 Spare part list.........................................................................................................................................16
6.1.1 M-ENTROPY....................................................................................................................................16
6.1.2 Front panel stickers ........................................................................................................................18
7 EARLIER REVISIONS 19
APPENDIX A 21
SERVICE CHECK FORM 1

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TABLE OF FIGURES
Figure 1 Measurement setup ............................................................................................................................. 2
Figure 2 A general view of the cable connections............................................................................................... 4
Figure 3 Entropy measurement system block diagram......................................................................................... 5
Figure 4 Entropy module troubleshooting flowchart...........................................................................................12
Figure 5 Exploded view of Entropy module ........................................................................................................17

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
Datex-Ohmeda S/5 Entropy Module, M-ENTROPY. The Entropy module is a single width plug-in
module designed for use with the S/5 Anesthesia monitors. Later in this manual modules can be
called w/o system name S/5.

Please see also related Technical Reference Manual for information related to system e.g.
related documentation, conventions used, symbols on equipment, safety precautions, system
description,system installation, interfacing, functional check and planned maintenance.

The Datex-Ohmeda S/5 Entropy Module, M-ENTROPY and accessories are indicated for monitoring
the state of the central nervous system (CNS) by data acquisition of electroencephalograph (EEG)
and frontal electromyograph (FEMG) signals in the anesthesia environment. The spectral entropies,
State Entropy (SE) and Response Entropy (RE), are processed EEG and FEMG variables, and may
be used as an aid in monitoring the effects of certain anesthetic agents.

The Entropy module uses:

• Electroencephalography (EEG) signal, together with
• spontaneous facial muscular activity with frontal electromyography (FEMG) signal to measure:
• Response Entropy (RE)
• State Entropy (SE)
• Burst suppression ratio (BSR)

The Entropy module is responsible for EEG and FEMG signal acquisition, amplification, filtering and
digitization and electrode impedance measurement. All the calculated parameters can be selected
on the display, and trended.

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2
3

3
Figure 1 Measurement setup

(1) Entropy module

(2) Entropy sensor cable
(3) Entropy sensor
NOTE: The Entropy Module, M-ENTROPY requires monitor software version 03 or greater.

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1 SPECIFICATIONS

1.1 General specifications

Module size (WxDxH) 37 x 180 x 112 mm/1.5 x 7.1 x 4.4 in
Module weight 0.3 kg/0.7 lbs
Power consumption 2.6 W W

1.2 Technical specifications

1.2.1 EntrEEG
Amplification 10 000
Resolution 60 nV
Max amplitude 800 µVpp
Sampling frequency 400 Hz
Range ±400 µV
Frequency range 0.5...118 Hz
Input impedance 1 MΩ @ 10 Hz
Noise level <0.5 µV rms from 0.5 Hz to 118 Hz
CMRR >100 dB @ 50 Hz
Parameters from EEG RE, SE, BSR
Defibrillation protection 3000V, 218 J
Allowable Input Offset ±300 mV

1.2.2 Impedance measurement

Measurement frequency 75 Hz
Current 10 µA
Range 0...30 kΩ
Resolution 100 Ω
Accuracy ±1kΩ or ±10 % whichever is greater
Measurement time, all leads 5 s
Start of measurement manual/automatic
Leads off detection >3 MΩ, continuous

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2 FUNCTIONAL DESCRIPTION

2.1 Measurements principle

Hypnotic component of anesthesia is most reliably monitored by measuring cortical electrical activity.
Electroencephalography (EEG) changes from irregular to more regular patterns when anesthesia
deepens. Similarly, frontalis EMG (FEMG) quiets down as the deeper parts of the brain are
increasingly saturated with anesthetics. Entropy measures irregularity of EEG and FEMG.
Entropy parameters and BSR are calculated from EEG and FEMG signals acquired with a sensor which
is attached to the patient's forehead. The sensor consists of three electrodes. This referential
measurement yields one channel of raw EntrEEG.
IMC 9 Sensor
conn. paddle
Entropy Module Sensor

Figure 2 A general view of the cable connections

2.1.1 EntrEEG
EEG is differential voltage signal measured from electrodes attached to the patient’s skin. EEG
measures the spontaneous electrical activity of the brain. This electrical activity reflects the state of
the brain. In referential measurement the referential electrode delivers its potential to every channel’s
minus-input. The signal is the potential difference between this common reference electrode (electrode
#3) and the electrode connected to plus input (electrode #1). Purpose of the ground electrode
(electrode #2) is to reduce common mode noise.

The EntrEEG signal is amplified, antialias filtered, digitised and software filtered. After that the EntrEEG
signal is shown on the screen and the RE, SE and BSR characteristics are calculated out of it.

2.1.2 FEMG
FEMG is electrical signal originating from facial muscles. FEMG signal has much broader spectrum than
EEG and it overlaps with EEG at low frequencies. FEMG signal gives its contribution to the RE values
(see chapter 2.1.3). Mains power frequency and its harmonics are digitally filtered away to reject
interference noise from power lines.

2.1.3 RE and SE
Entropy numbers range from 100 to zero (RE 0-100, SE 0 – 91), correlating to the patient's anesthetic
state. High values of Entropy indicate high irregularity of the signal signifying that the patient is awake.
There are two Entropy parameters: the fast-reacting Response Entropy and the more steady and robust
State Entropy. State Entropy consists of the entropy of EEG signal calculated up to 32 Hz. Response
Entropy includes additional high frequencies up to 47 Hz and, consequently the fast frontalis EMG
(FEMG) signals enable a fast response time.

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Response Entropy, RE 0 < f < 47 Hz

State Entropy, SE 0 < f < 32 Hz

Table 1 Frequency ranges for Entropy calculation.

2.1.4 Impedance measurement

The impedance measurement is done for all leads at the same time and the EntrEEG is stopped for
no longer than 5 seconds during the impedance measurement.
Differences in electrode impedance of the electrodes causes common mode noise coupling to
measured signal. To minimise this the electrode impedance is measured and a warning of
unsatisfactory impedance level is generated when necessary. The impedance of an electrode is
measured by applying a known current through the electrode and measuring the voltage drop over
the electrode. This way the impedance of a single electrode can be resolved.

2.2 Main components

The Entropy board consists of the following functional sections:

• Microprosessor for measurement control, and for processing the measurement signal
• Digital I/O circuit for smart chip communication (the chip is located in the entropy sensor)
• Serial communication driver for module bus communication

The serial bus speed to monitor is 500 kbps and the bus itself is half duplex, i.e. data can be
transferred to both directions but only one way at a time.

+15 V Isolation Module Keys

Transformer
A / D Converter

EEPROM
Amplification
Patient Isolation
Module Bus

To Entropy
Filtering

IMC Connector

CPU Sensor
&

Board

Watchdog 3048 To Smart

Chip
Digital
I/O
Reset Opto RS485
Data Isolation Driver

Figure 3 Entropy measurement system block diagram

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2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14
Female D25

Table 2 Module bus connector (X1) pin description

PIN Name Description

1 Reset_ RS485 Module Bus Reset +
3 +15VD +15V Supply voltage
5 Ndata_ RS485 Module Bus Data -
6 Data_ RS485 Module Bus Data +
7 GND Ground
8 Nreset_ RS485 Module Bus Reset -
13 GND Ground
Other NC Not Connected

2.3.2 Module front panel connector

Front view
9 8 7 6

5 4 3 2 1

F K
Table 3 Module front panel connector pin description

PIN Name Color Description

1 VCC PURPLE Supply voltage

2 I/O WHITE Bi-directional data line (open drain)
3 CLOCK BLUE Clock input
4 RESET YELLOW Control input (reset)
5 GND GREY Smartchip ground
6 Screen - Cable screen
7 Electrode 2 (N) GREEN EEG channel neutral
8 Electrode 3 (-) RED EEG channel -
9 Electrode 1 (+) BROWN EEG channel +

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the M-ENTROPY is limited to replacing faulty circuit boards or mechanical
parts. Faulty circuit boards should be returned to Datex-Ohmeda for repair.

Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.

The Datex-Ohmeda simulator for M-ENTROPY (order code N-ES ) is recommended for functional
checks.
CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form, Appendix A, which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
simulator for M-ENTROPY N-ES
Screwdriver

• Detach the module box by removing the two screws from the back of the module. Be careful
with the loose latch and spring pin for locking.
1. Check internal parts:
− screws are tightened properly
− cables are connected properly
− the EMC cover is attached properly in the module
− there are no loose objects inside the module

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?
2. Check external parts of the module:
− the front cover and the front panel sticker are intact
− connectors are intact and are attached properly
− the module box, latch and spring pin for locking are intact

?
• Reattach the module box.
• Turn the monitor on and wait until the normal monitoring screen appears.
• Configure the monitor screen so that information regarding the Entropy measurement is
shown:

Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - EntrEG

Others - Entropy - Entr.EEG - 250 µV

Others - Entropy - Display format - All
Others - Entropy - Automatic check - OFF

3. Plug in the module. Check that it goes in smoothly and locks up properly

?
4. Check that the module is recognized, i.e. the EntrEEG header with related information
appears in the chosen waveform fields and ‘Cable off’ message is shown on the field.

?
5. Connect the cable to the module. Check that the cable is recognized i.e. message ‘No
sensorf’ is shown on the waveform field. If the Entropy sensor is connected ‘Sensor off’
message appears.

?
6. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Record the information regarding the software of M-ENTROPY by selecting SCROLL VERS and
turning the ComWheel.

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7. Enter the Entropy module service menu:

Parameters - More… - Entropy

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values in the module view
are not increasing faster than by 5 per second. Check that the memories of the module have
passed the internal memory test, i.e. ‘RAM’, ‘ROM’ and ‘EEPROM’ all state OK.

?
8. Check the Entropy and Check Sensor membrane keys both of the module. Go to module
view and press each key for at least one second and check that the key being pressed is
identified, i.e. the Check Sensor text is highlighted in the service menu and that press Entropy
key brings up the Entropy menu.

?
9. Connect the Entropy simulator (N-ES) to the cable. Go to Entropy service menu and select
Check Sensor. From the Sensor view check that the impedances in all three leads are 0 kΩ.

?
10. Keep the Entropy simulator connected and check that the EntrEEG waveform and RE and SE
values appear on the monitor screen. The RE and SE values start to decrease after a couple of
minutes.

?
11. Perform an electrical safety check and a leakage current test.

?
12. Check that the module functions normally after performing the electrical safety check.

?
13. Clean the module with suitable detergent.

?
• Fill in all necessary documents.

3.3 Disassembly and reassembly

3.3.1 M-ENTROPY
Disassemble the M-ENTROPY in the following way.

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1. Remove the two screws from the back of the module.

2. Pull the module box slowly rearward and detach it from main body. Be careful with the loose
latch and spring locking pin.
3. Detach the Entropy board by removing the two screws located near the front panel frame,
disconnect the cable and pull out the front panel frame.
To reassemble the module, reverse the order of the disassembly steps.

CAUTION When reassembling the module, make sure that the cables are reconnected
properly.

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4 TROUBLESHOOTING

4.1.1 Troubleshooting chart

Trouble Cause Treatment

No EntrEEG waveform on screen. EntrEEG waveform not selected on screen. Press Monitor Setup key and select EntrEEG
waveform on the screen.
No EntrEEG waveform on screen and ‘Sensor Entropy sensor not attached to skin. Attach sensor to patient.
off’ message shown in the number field.
Number field shows ‘- - -‘ and message Module could not accomplish a successful Check the sensor connection to skin and
‘Sensor check failed' is displayed in number sensor check. initiate a new check by pressing 'Check
field. sensor' module key or from Entropy menu.
EntrEEG signal looks noisy and 'Noise' High frequency electrical interference (i.e., Remove noise sources if possible. Check the
message is displayed in the number field electrocautery) is coupling to the sensor. sensor and electrode impedances.
and waveform field
Sensor check measurement is not available Measurement is off because sensor is not Sensor check starts immediately when
on menus. connected to cable and to patient. sensor is connected to the patient and first
Entropy values should appear 15 seconds
after successful sensor check.
Electrode impedances show ‘Fail‘ and One or more of sensor electrodes is poorly Check the sensor contact and cable. If the
'Press electrodes' message is displayed on connected to patient. sensor electrodes have too high impedance
number fields after impedance (>7.5k) the measurement fails even if the
measurement. sensor seems properly attached. Cure for
this is to prepare the skin better, check that
the sensor is not dried out or outdated and
try again.

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4.1.2 Troubleshooting flowcharts

Possible fault Entropy module

Take all modules out of the frame

Insert M-ENTROPY and turn

power on

Does fault still appear? No Fault not in Entropy module

Yes

Enter the Entropy Service menu

No
Check are the Timeouts, Bad
checksums or Bad c-s by
running?

Does another module

OK? No
work in the same slot?
Yes

Check RAM, ROM and EEPROM

Yes

OK? No Replace Entropy board

Yes No

Does another
Connect sensor cable into DMC connector board work Yes Replace DMC connector board
module connector and Entropy with module?
sensor into sensor cable
No

Check from sensor view that Does another

module recognizes Entropy sensor cable work with Yes Replace sensor cable
sensor module?

No

Does another
OK? No Entropy sensor work with Yes Replace Entropy sensor
module?
Yes

Check front panel key function

Is the keypad
OK? No No Connect the keypad
connected?

Yes
Yes
Fault not in Entropy
module
Does the test
pass with another Yes Replace the keypad
keypad?

No Replace Entropy board

Figure 4 Entropy module troubleshooting flowchart

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5 SERVICE MENU
NOTE: The Service Menu pictures are for reference only. Details on the menu page can vary
depending on the software version.

Press the Monitor Setup key - select Install/Service (password: 16-4-34) - select Service
(password: 26-23-8) - select Parameters - More... - Entropy.

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5.1 Entropy service menu

Check Sensor Module measures impedance of sensor
electrodes. Works same way as from Entropy menu or
module key.
Module Service data is changed to module view.
Measurement shows whether the Entropy
measurement is ON or OFF. Measurement should start
by itself when the sensor is attached to the patient
Last service shows the date of last maintenance.
Entropy refers to the respective module key. Is
highlighted when Entropy key is pressed on module.
(Opens the Entropy menu.)
Check Sensor is highlighted when the Check Sensor
key is pressed on module. Activates the sensor check
Mains shows the currently used mains frequency, 50 or
60 Hz:
BSR Status shows Burst if the module is not currently
detecting suppressed EEG. Shows Suppression if the
module is detecting suppressed EEG periods.
Artefact shows Off if there is no high-frequency noise
present, On if the module detects noise.
Diathermy shows On if the module is detecting
diathermy (i.e., electrocautery)
AD clipped shows On if the signal is getting clipped at
the A/D converter.

Alg. ver. (Mon) shows monitor algorithm version

number.
Alg. ver. (Mod) shows module algorithm version
number.
Alg. ver. used shows the currently used algorithm
version.

Mod Mon Timeouts is a cumulative number that

indicates how many times the module has not
responded to monitor’s inquiry.
Mod Mon Bad Checksum is a cumulative number that
indicates how many times there has been an error in the
message from module to monitor.
Mon Mod Bad Checksum is a cumulative number that
indicates how many times there has been an error in the
message from monitor to module.

RAM indicates the state of the RAM memory.

ROM indicates whether the checksum at the EPROM is
accordance with the one the software has calculated.
EEPROM indicates if the values stored in permanent
memory are valid.The states in memory checks are OK,
Fail or ? (module not in place or a communication
error).

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Sensor Service data is changed to sensor view.

Entropy refers to the respective module key. Is
highlighted when Entropy key is pressed on
module. (Opens the Entropy menu.)
Check Sensor is highlighted when the Check
Sensor key is pressed on module. Activates the
sensor check.
Cable indicates whether the Entropy sensor cable is
connected to the module or not.
Sensor indicates whether the Entropy sensor is
connected to the cable or not.
Sensor S/N module reads manufacturing serial
number form the sensor chip
Sensor Lot module reads manufacturing lot
number form the sensor chip
Lead 1/2/3 shows the lead on/off status of all
sensor electrodes.
Imped. 1/2/3 shows the respective impedance
value of each sensor electrode of last impedance
check.
Imp. Meas. shows On if the Automatic check
(sensor impedance measurement) is on in the
module.
Imp. Check shows OK if the last impedance check
has been succesful.

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6 SPARE PARTS
6.1 Spare part list
NOTE: Accessories are listed in the Patient monitor and supplies catalogue.

6.1.1 M-ENTROPY
Item Description Order code Item Description Order code
1 Entropy board, M-ENTROPY 8004787 7 Membrane keypad 880101
2 IMC Connector board 8004791 8 Ferrite holder 8005304
3 Cross cylinder screw M3x8 628712 9 Latch 879181
4 Metal frame 879184 10 Spring pin 879182
5 Screw M3x4 61719 11 Module box 886167
(single width)
6 Front mask 8004742 12 Cross recess screw M3x8 616215
14 Cross cylinder screw M3x12 628700 13 Connector cable 8005305

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11

14
3
2

12
7

10

13

Figure 5 Exploded view of Entropy module

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6.1.2 Front panel stickers

Adaptation S/5 M-ENTROPY
DA 8004757
DE 8004748
EN 8004747
ES 8004751
FI 8004754
FR 8004749
IT 8004752
JA 8004758
NL 8004750
NO 8004756
PL 8004759
PT 8004753
SV 8004755

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7 EARLIER REVISIONS
Revision Manual slot/main manual Note

No previous revisions

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APPENDIX A

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This page intentionally left blank.

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SERVICE CHECK FORM

Entropy Module, M-ENTROPY

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts of
module
3. Installation 4. Recognition of module

5. Recognition of sensor

6. Module software M-ENTROPY

7. Communication and
memories of module
8. Membrane keys

9. Impedances + -
Lead1 1...3 kΩ
Lead 2 1...3 kΩ
Lead 3 1...3 kΩ
10. Checks with simulator Allowed range
EntrEEG waveforms 245...255 µVpp
RF value 8...12
SE value 8...10
11. Electrical safety check 12. Functioning after
electrical safety check
13. Final cleaning

A-1(2)
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Notes

Used Spare Parts

Signature

A-2(2)
Document No. 800 4390
 Datex-Ohmeda
Hemodynamic Modules
TM
S/5 PRESTN Module, M-PRESTN (Rev. 01)
S/5TM RESTN Module, M-RESTN (Rev. 01)
S/5TM PRETN Module, M-PRETN (Rev. 01)

Technical Reference Manual Slot

All specifications are subject to change without notice.

CAUTION: U.S. Federal law restricts this device to sale by or on the order of a licenced practitioner.
Outside the USA, check local laws for any restriction that may apply.

Document No. 8005571-1

April 2004

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel: +358 10 394 11 Fax: +358 9 146 3310
Tel: 1-608-221-1551 Fax: 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com © Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5 Hemodynamic Modules
TABLE OF CONTENTS i
TABLE OF FIGURES iii
Introduction 1
1 Specifications 3
1.1 General specifications .......................................................................................................................... 3
1.2 Typical performance ............................................................................................................................. 3
1.2.1 NIBP ........................................................................................................................................... 3
1.2.2 ECG............................................................................................................................................. 3
1.2.3 Pulse oximetry ............................................................................................................................. 4
1.2.4 Temperature ................................................................................................................................ 4
1.2.5 Invasive blood pressure................................................................................................................ 5
1.2.6 Respiration.................................................................................................................................. 5
1.3 Technical specifications........................................................................................................................ 6
1.3.1 NIBP ........................................................................................................................................... 6
1.3.2 ECG............................................................................................................................................. 6
1.3.3 Pulse oximetry ............................................................................................................................. 6
1.3.4 Temperature ................................................................................................................................ 7
1.3.5 Invasive blood pressure................................................................................................................ 7
1.3.6 Respiration.................................................................................................................................. 7
2 Functional Description 8
2.1 Measurement principle......................................................................................................................... 8
2.1.1 NIBP ........................................................................................................................................... 8
2.1.2 ECG............................................................................................................................................. 8
2.1.3 Pulse oximetry ............................................................................................................................. 8
2.1.4 Temperature .............................................................................................................................. 10
2.1.5 Invasive blood pressure.............................................................................................................. 10
2.1.6 Respiration................................................................................................................................ 10
2.2 Main components .............................................................................................................................. 11
2.2.1 M-PRESTN/-RESTN/-PRETN modules ......................................................................................... 11
2.2.2 NIBP board................................................................................................................................ 12
2.2.3 ECG board in 12-lead measurement ........................................................................................... 15
2.2.4 ECG filtering............................................................................................................................... 17
2.2.5 STP board.................................................................................................................................. 18
2.3 Connectors and signals ...................................................................................................................... 23
2.3.1 Module bus connector (on the NIBP board) ................................................................................. 23
2.3.2 Front panel connectors............................................................................................................... 25
2.3.3 Test points on boards ................................................................................................................. 26
3 Service Procedures 29
3.1 General service information ................................................................................................................ 29
3.2 Service check..................................................................................................................................... 29
3.2.1 Recommended tools.................................................................................................................. 29
3.2.2 Recommended parts.................................................................................................................. 29
3.3 Disassembly and reassembly.............................................................................................................. 39
3.3.1 M-PRESTN/-RESTN/-PRETN modules ......................................................................................... 39
3.4 Adjustments and calibrations ............................................................................................................. 40
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3.4.1 NIBP calibrations....................................................................................................................... 40

3.4.2 Temperature calibration ............................................................................................................. 42
3.4.3 Invasive pressure calibration ...................................................................................................... 42
4 Troubleshooting 43
4.1 Troubleshooting charts ....................................................................................................................... 43
4.1.1 NIBP ......................................................................................................................................... 43
4.1.2 NIBP error code explanation ....................................................................................................... 46
4.1.3 ECG .......................................................................................................................................... 47
4.1.4 Pulse oximetry (SpO2) ................................................................................................................ 47
4.1.5 Temperature.............................................................................................................................. 48
4.1.6 Invasive blood pressure ............................................................................................................. 49
4.1.7 Impedance respiration............................................................................................................... 50
4.2 Troubleshooting flowcharts ................................................................................................................. 51
4.2.1 M-PRESTN module troubleshooting for NIBP parameter............................................................... 51
4.2.2 M-PRESTN module troubleshooting for parameters ESTPR ........................................................... 52
5 Service Menu 53
5.1 NIBP service menu ............................................................................................................................. 54
5.1.2 NIBP demo menu....................................................................................................................... 55
5.1.3 NIBP calibration menu ............................................................................................................... 56
5.1.4 NIBP safety valve menu.............................................................................................................. 57
5.1.5 NIBP pulse valve menu .............................................................................................................. 58
5.1.6 NIBP buttons/leds menu............................................................................................................ 59
5.1.7 NIBP pneumatics menu ............................................................................................................. 60
5.1.8 NIBP watchdog menu................................................................................................................. 61
5.1.9 ECG service menu...................................................................................................................... 62
5.1.10 ECG setup menu.................................................................................................................... 64
5.2 STP service menu............................................................................................................................... 65
5.2.2 STP calibration menu ................................................................................................................. 67
6 Spare Parts 68
6.1 Spare parts list................................................................................................................................... 68
6.1.1 M-PRESTN rev. 01, M-RESTN rev. 01, M-PRETN rev. 01 ............................................................... 68
7 Earlier Revisions 71
APPENDIX A 73
Service Check Form 1

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 Table of contents

TABLE OF FIGURES
Figure 1 S/5 PRESTN Module, M-PRESTN........................................................................................................... 1
Figure 2 Absorption of infrared light in the finger probe parts layout and schematic diagram ................................. 9
Figure 3 Front panel of M-PRESTN.................................................................................................................... 11
Figure 4 NIBP board functional block diagram .................................................................................................. 12
Figure 5 NIBP pneumatics diagram .................................................................................................................. 14
Figure 6 12-lead ECG measurement block diagram ..........................................................................................15
Figure 7 STP board block diagram .................................................................................................................... 18
Figure 8 Temperature measurement principle ................................................................................................... 19
Figure 9 Pressure measurement principle......................................................................................................... 20
Figure 10 Pulse oximetry measurement block diagram.................................................................................... 21
Figure 11 Serial communication of NIBP board............................................................................................... 22
Figure 12 Serial Communication and Isolation of STP board............................................................................ 22
Figure 13 Serial Communication and Isolation of ECG board ........................................................................... 22
Figure 14 Module bus connector (X1) pin layout ............................................................................................. 23
Figure 15 ECG board connectors and test points............................................................................................. 26
Figure 16 NIBP board connectors and test points............................................................................................ 27
Figure 17 STP board connectors and test points ............................................................................................. 28
Figure 18 M-PRESTN module troubleshooting flowchart for NIBP Parameter..................................................... 51
Figure 19 M-PRESTN Module Troubleshooting Flowchart for Parameters ESTPR................................................ 52
Figure 20 Exploded view of M-PRESTN Module ............................................................................................... 68

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INTRODUCTION
This Technical Reference Manual Slot provides information for the maintenance and service of the
hemodynamic modules S/5 M-PRESTN/-RESTN/-PRETN. The modules are double width modules
designed for use with S/5 monitors. Later in this manual modules may be referred to w/o the
system name S/5 for simplicity.
Please also refer to Technical Reference Manual of the S/5 monitor for information regarding
system specific information e.g. related documentation, conventions used, symbols on equipment,
safety precautions, system description, system installation, interfacing, functional check and
planned maintenance.
The M-PRESTN/-RESTN/-PRETN modules provide general hemodynamic parameters.
NOTE: Do not use identical modules in the same
Auto Start Zero Zero monitor simultaneously.
On/Off Cancel P1 P2
The following modules are considered identical:
NIBP
SpO2
M-ESTP/-EST/-ETP,
M-ESTPR/-ESTR/-ETPR,
M-NESTPR/-NESTR/-NETPR,
ECG M-NE12STPR/-NE12STR/-NE12TPR
T1 P1 M-PRESTN/M-RESTN/M-PRETN

T2 P2

Figure 1 S/5 PRESTN Module, M-PRESTN

Table 1 Options of S/5 hemodynamic modules

Parameter PRESTN RESTN PRETN

P Two invasive blood pressures • •
R Impedance respiration • • •
E ECG • • •
S Pulse oximetry • •
T Two temperatures • • •
N NIBP • • •
NOTE: 12-lead ECG measurement requires Display Controller, B-DISP or B-DISPX.
Intended purpose (Indications for use)
The Datex-Ohmeda PRESTN module (model family M-PRESTN) and accessories are indicated for
monitoring of hemodynamic parameters of all hospital patients. The hemodynamic parameters of
the module comprise ECG including ST-segment and arrhythmia, Impedance respiration, NIBP,
Temperature,SpO2 (including monitoring during conditions of clinical patient motion),and invasive
blood pressure.
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Impedance respiration measurement is indicated for patients aged 3 and up. The NIBP
measurement is indicated for patients who weigh 5kg (11 lb.) and up. This device is indicated for
use by qualified medical personnel only.
Monitor software compatibility
Datex-Ohmeda PRESTN rev. 01 module is designed for use with Datex-Ohmeda monitors using
software as follows:
AM: L-ANE01(A) or later versions;
CCM: S-00C01 rev. 10.5, S-00C02 rev. 10.5 or newer versions;
CAM: S-00A05 rev. 10.9, S-00A06 rev. 10.9, L-00A07 rev. 10.9, L-00A08 rev. 10.9 or newer
versions and
CCCM: S-00C03 rev. 10.9, S-00C04 rev. 10.9 or newer versions.

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1 SPECIFICATIONS

1.1 General specifications

Module size 75 × 180 × 112 mm
W×D×H 3.0 × 7.1 × 4.4 in
Module weight 0.7 kg / 1.5 lbs
Power consumption about 6 W
Operation temperature 10 to 40 °C / 50 to 104 °F

1.2 Typical performance

1.2.1 NIBP
NOTE: Non-invasive blood pressure measurement is intended for patients weighing over 5 kg (11
lb.)
Oscillometric measurement principle.
Measurement range adult 25 to 260 mmHg
child 25 to 195 mmHg
infant 15 to 145 mmHg
Pulse rate range accepted 30 to 250 bpm
Measurement interval STAT (continuous 5 min), 1, 2.5, 3, 5, 10, 15, 30 and 60 min (1 h),
2 and 4 h
Typical measuring time adult 23 s
infant 20 s
Initial inflation pressure adult 170 ±10 mmHg
child 150 ±10 mmHg
infant 120 ±10 mmHg
Venous stasis adult 40 ±5 mmHg / 2 min
child 40 ±5 mmHg / 2 min
infant 30 ±5 mmHg / 1 min
Cuff widths please see User’s Guide

1.2.2 ECG
Lead selection, 12-lead ECG I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6
Lead selection, other modules I, II, III, aVR, aVL, aVF, V
Sweep speeds 12.5, 25, 50 mm/sec
DISPLAY FILTER
Diagnostic, 12-lead ECG 0.05 to 150 Hz
Diagnostic, other modules 0.05 to 100 Hz
Monitoring 0.5 to 30 Hz (-3 dB, with 50 Hz reject filter)
0.5 to 40 Hz (-3 dB, with 60 Hz reject filter)

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ST filter 0.05 to 30 Hz (-3 dB, with 50 Hz reject filter)

0.05 to 40 Hz (-3 dB, with 60 Hz reject filter)
HEART RATE FROM ECG
Range 30 to 250 bpm
Accuracy ±5 bpm or ±5 %, whichever is greater
Resolution 1 bpm
Update interval 5s
Averaging time 10 s
ST LEVELS (in main software)
ST level range -9 to +9 mm (-0.9 to +0.9 mV)
Resolution 0.1 mm (0.01 mV)
Averaging calculated from 8 QRS
SYNCHRONIZATION
Direct ECG analog output of ECG, 1 V/1 mV
Pacer 5 V and 0.5 to 2.5 ms pulse, < 30 ms after pacer peak
Defibrillator 5 V and 10 ms pulse, < 35 ms after R-point synchronization

1.2.3 Pulse oximetry

Measurement range 0 to 100 %
Calibration range 70 to 100 %
Accuracy1 100 to 70 %, ±2 digits
±3 digits during clinical patient motion
69 to 0 %, unspecified
Display resolution 1 digit = 1 % of SpO2
Display averaging time 20, 10 sec, beat-to-beat
Pulse beep pitch varies with SpO2 level
The monitor is calibrated against functional oxygen saturation SpO2 func.
PULSE RATE FROM PLETH
Measurement range 30 to 250 bpm
Accuracy 30 to 100, ±5 bpm,
100 to 250, ±5 %
Resolution 1 bpm
Display averaging 10 s
Adjustable pulse beep volume.
PLETH WAVEFORM
Scales 2, 5, 10, 20, 50 mod%, Auto
Start up scale is 20 mod% if AUTO is not selected to be the default setting.

1.2.4 Temperature
Measurement range 10 to 45 °C (50 to 113 °F)
Measurement accuracy ±0.1 °C (25 to 45.0 °C)

1 Accuracy is based on deep hypoxia studies with volunteered subjects during motion and non-motion conditions over a wide range of arterial
blood oxygen saturations as compared to arterial blood CO-Oximetry.

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±0.2 °C (10 to 24.9 °C)

Display resolution 0.1 °C (0.1 °F)
Temperature test automatic (every 10 min)
Probe type compatible with YSI 400 series
Single use sensors ±0.2 °C (25 to 45.0 °C)
±0.3 °C (10 to 24.9 °C)

1.2.5 Invasive blood pressure

Measurement range -40 to 320 mmHg
Measurement accuracy ±2 mmHg or ±5 %
Zero adjustment range ±150 mmHg
Calibration range ±20 %
Scales upper limit is adjustable between 10 and 300 mmHg in steps of
10. Lower limit is 10 % of selected upper limit below zero.
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40 to 320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30 to 300 mmHg
PULSE RATE FROM ARTERIAL PRESSURE
Measurement range 30 to 250 bpm
Resolution 1 bpm
Accuracy ±5 bpm or ±5 % whichever is greater

1.2.6 Respiration
NOTE: The respiration measurement is intended for patients over three years old
Measurement range 4 to 120 bpm
Accuracy ±5 bpm or ±5 %
Resolution 1 bpm
Averaging time 30 s
Update interval 10 s
RESPIRATION WAVEFORM
Sweep Speeds 6.25 mm/s and 0.625 mm/s

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1.3 Technical specifications

1.3.1 NIBP
Deflation rate, PR dep. 3 to 8 mmHg/s
Inflation time 20 to 185 mmHg, 1 to 5 s
Automatic software control, max. inflation pressure
adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 145 ±5 mmHg
Over pressure limit, stops measurement after 2 seconds
adult 320 mmHg
child 220 mmHg
infant 160 mmHg
The safety circuit limits the maximum cuff pressure to 320 mmHg in adult/child mode or 160
mmHg in infant mode. Independent timing circuit limits pressurizing (>15 mmHg) time to 3 minutes
maximum in adult/child mode, and 90 seconds at (>5mmHg ) in infant mode.
Zeroing to ambient pressure is done automatically.
Inflation pressure is adjusted according to the previous systolic pressure, typically 40 mmHg
above. If the systolic pressure is not found, inflation pressure is increased typically 50 mmHg.
Max. measurement time adult 120 s
child 120 s
infant 75 s
Pressure transducer accuracy is better than ±3 mmHg or ±2 % whichever is greater.
Max. error ±4 mmHg.
Protection against electrical
shock Type BF defibrillation proof

1.3.2 ECG
Defibrillation protection 5000 V, 360 J
Recovery time 5s
Input impedance >2.5 MΩ (10 Hz)
CMRR ≥95 dB (ST)
System noise <30 µV (p-p, RTI)
Allowable offset ±800 mVDC
Gain range 0.2 to 5.0 cm/mV
Pacemaker pulse detection 2 to 700 mV, 0.5 to 2 ms pulses
Protection against electrical
shock Type CF defibrillator proof

1.3.3 Pulse oximetry

Protection against electrical
shock Type BF defibrillation proof

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1.3.4 Temperature
Measurement accuracy ±0.1 °C (25.0 to 45.0 °C)
±0.2 °C (10.0 to 24.9 °C)
Protection against electrical
shock Type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified, depending on
transducer/probe used. Please refer to the transducer/probe specification.

1.3.5 Invasive blood pressure

DIGITAL DISPLAY AVERAGING
Digital displays Art and P1 are averaged over 5 seconds and updated at 5 seconds intervals. All
other pressures have respiration artifact rejection.
Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and input sensitivity
5 µV/V/mmHg, 5 VDC, 20 mA max current
Filter 0 to 4 - 22 Hz adjustable
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time less than 15 s
Protection against electrical
shock Type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified, depending on
transducer/probe used. Please refer to the transducer/probe specification.

1.3.6 Respiration
Excitation frequency,
12-lead ECG 31.25 kHz
Breath detection automatic, range 0.3 to 6 Ω manually adjustable minimum
detection: 0.2, 0.4, 0.6, 0.8, 1.0
Input dynamic range 0.2 to 32 Ω
Input impedance range 100 to 5000 Ω
Respiration Rate min. 4 bpm
max. 120 bpm
Lead off detection >3 MΩ

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 NIBP
NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure.
The NIBP measurement is performed according to the oscillometric measuring principle. The cuff is
inflated with a pressure slightly higher than the presumed systolic pressure, and deflated at a
speed based on the patient’s pulse, collecting data from the oscillations caused by the pulsating
artery. Based on these oscillations, values for systolic, mean, and diastolic pressures are
calculated.
The following parts are necessary for the NIBP measurement:
• M-PRESTN/-RESTN/-PRETN module
• twin hose (adult or infant model)
• blood pressure cuffs (various sizes)

2.1.2 ECG
Electrocardiography analyzes the electrical activity of the heart by measuring the electrical
potential produced with electrodes placed on the surface of the body.
ECG reflects:
• electrical activity of the heart
• normal/abnormal function of the heart
• effects of anesthesia on heart function
• effects of surgery on heart function
See the User's Guide or the User’s Reference Manual for electrodes positions and other
information.

2.1.3 Pulse oximetry

A pulse oximeter measures the light absorption of blood at two wavelengths, one in the near
infrared (about 900 nm) and the other in the red region (about 660 nm) of the light spectrum. These
wavelengths are emitted by LEDs in the SpO2 probe, the light is transmitted through peripheral
tissue and is finally detected by a PIN-diode opposite the LEDs in the probe. The pulse oximeter
derives the oxygen saturation (SpO2) using an empirically determined relationship between the
relative absorption at the two wavelengths and the arterial oxygen saturation SaO2.
In order to measure the arterial saturation accurately, pulse oximeters use the component of light
absorption giving variations synchronous with heart beat as primary information on the arterial
saturation.
A general limitation of pulse oximetry is that due to the use of only two wavelengths only two
hemoglobin species can be discriminated by the measurement.
The modern pulse oximeters are empirically calibrated either against fractional saturation SaO2frac;
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HbO2
SaO2frac = Formula 1
HbO2 + Hb + Dyshemoglobin
or against functional saturation SaO2func;
HbO2
SaO2func = Formula 2
HbO2 + Hb
Functional saturation is more insensitive to changes of carboxyhemoglobin and methemoglobin
concentrations in blood.
The oxygen saturation percentage SpO2 measured by the Datex-Ohmeda module is calibrated
against functional saturation SaO2func. The advantage of this method is that the accuracy of SpO2
measurement relative to SaO2func can be maintained even at rather high concentrations of
carboxyhemoglobin in blood. Independent of the calibration method, pulse oximeters are not able
to correctly measure oxygen content of the arterial blood at elevated carboxyhemoglobin or
methemoglobin levels.

Plethysmographic pulse wave

The plethysmographic waveform is derived from the IR signal and reflects the blood pulsation at the
measuring site. Thus the amplitude of the waveform represents the perfusion.

Pulse rate
The pulse rate calculation is done by peak detection of the plethysmographic pulse wave. The
signals are filtered to reduce noise and checked to separate artifacts.

Probe
The standard probe is a finger clamp probe which contains the light source LEDs in one half and the
photodiode detector in the other half. Different kinds of probes are available from Datex-Ohmeda.

SpO2 sensor connector

SpO2 sensor cable

6
GND
IRED
Emitter
7
PRSTN_absorption_of_infrared.vsd

ILED
4 GND
RED 5
DEF_A
8 IS
9
DET_C

Detector

Figure 2 Absorption of infrared light in the finger probe, parts layout and schematic
diagram

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2.1.4 Temperature
The temperature is measured by a probe whose resistance varies when the temperature changes,
called NTC (Negative Temperature Coefficient) resistor.
The resistance can be measured by two complementary methods:
• Applying a constant voltage across the resistor and measuring the current that flows
through it
• Applying a constant current through the resistor and measuring the voltage that is
generated across it.
In Datex-Ohmeda modules the two methods are combined in the form of a voltage divider. The NTC-
resistor is connected in series with a normal resistor and a constant voltage is applied across them.
The temperature dependent voltage can be detected at the junction of the resistors, thus producing
the temperature signal from the patient. The signal is amplified by analog amplifiers and further
processed by digital electronics.

2.1.5 Invasive blood pressure

To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The transducer is placed at
the same level with the heart, and is electrically zeroed.
The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor
interprets the voltage signal so that pressure data and pressure waveforms can be displayed.

2.1.6 Respiration
Impedance respiration is measured across the thorax between ECG electrodes. The respiration
signal is made by supplying current between the electrodes and by measuring the differential
current from the electrodes. The signal measured is the impedance change caused by breathing.
From these impedance changes, respiration rate is calculated, and the respiration waveform is
displayed on the screen.

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2.2 Main components

2.2.1 M-PRESTN/-RESTN/-PRETN modules

Auto Start Zero Zero

On/Off Cancel P1 P2
SpO2
NIBP

ECG
T1 P1

T2 P2

Figure 3 Front panel of M-PRESTN

The M-PRESTN, M-RESTN, and M-PRETN modules contain three main PC boards, the STP board,
the ECG board, and the NIBP board. They work independently. Each of these has their own
processor and software in the processor flash memory.
There are two small boards, the SP input and the ECG input board attached to the front panel of the
module. The front panel has seven connectors and four keys. The connectors are two for
temperature measurement, two for invasive blood pressure measurement, one for ECG, one for
NIBP, and one for SpO2 measurement. The keys are for NIBP Auto On/Off, NIBP Start/Cancel, P1
zero, and P2 zero.

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2.2.2 NIBP board

PATIENT AND NIBP CUFF

NIBP TUBING

NIBP CONNECTOR

NIBP PNEUMATICS

DRIVERS FOR PUMP &

PRESSURE SENSORS
VALVES

NIBP CONTROL KEYS

MAIN CPU SAFETY CPU

NV MEMORY

RS 485 COMMUNICATION POWER SUPPLY

NIBP BLOCK DIAGRAM MODULE BUS CONNECTOR

Figure 4 NIBP board functional block diagram

Signal processing
Two signals from the pressure transducers are amplified and sent to the A/D converter. After the
converter, digitized signals are sent to the microprocessor for data processing.
The NIBP board is controlled with a H8/3052 microprocessor at 16 MHz oscillator frequency.
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Memory
NIBP program memory (processor flash memory) size is 512k × 8. The processor has 4 kBytes RAM
and there is also an external RAM memory the size of which is 128k x 8. Variable values of the NIBP
measurement are stored into the external RAM. The EEPROM size is 512 x 8 and it is used to store
the calibration values for the pressure transducers, the pulse valve constants gained during
measurements, the PC board identification, and module serial number.

Software control
Software controls valves and pump. In addition to the individual on/off signals for each component
there is a common power switch for the valves and the pump that can be used at pump/valve
failures.
In addition to external RS485 reset line the microprocessor system is equipped with its own power-
up reset. See the section in the ECG board’s description: “RS485 communication”

Safety circuit
The NIBP board is equipped with an independent safety circuit to disconnect supply voltages from
the pump and the valves if the cuff has been pressurized longer than the preset maximum
measurement time, or if the pressure of the cuff is inflated over the specified pressure limit. The
maximum measurement time values and pressure limits for different measurement modes have
been specified in the technical specification section of this manual.

Pneumatics
Pneumatics of PRESTN module has the following parts:
• Intake air filter; for preventing dust and other parts to enter the air pump and the
valves.
• Air pump: for pumping the measuring pressure of the cuff.
• (Pulse) Valve; for producing a linear pressure fall (bleeding) in order to measure the
blood pressure of the patient.
Note that there has been used also two other names Valve and Set valve to
designate pulse valve in service menu.
• Safety valve; The safety valve has been intended to be used for deflating the cuff in
single fault case, i.e. to prevent too long measurement time or too high inflation
pressure of the cuff.
Note that there has been used also Exh2 valve to designate the Safety valve in
service menu.
• Main pressure sensor; for measuring the pressure of the blood pressure cuff and
the pressure fluctuations caused by arterial wall movement.
• Safety pressure sensor for detection of cuff hose type, cuff loose, cuff occlusion
situations etc.and recognising the pressure sensor fault.
• Cuff connector; for connecting the cuff.

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Safety pressure sensor

Cuff connector
Proportional valve

Air pump

NIBP_pneum_diagr.vsd
Dump valve
Main pressure sensor
Intake air filter

Figure 5 NIBP pneumatics diagram

Power supply section of the NIBP board

All connections are established via 25-pin connector (D-type, female). The module needs +15 V
(dirty) power supply to operate. The supply voltage (+15V) is generated in the power supply section
of the S/5 monitor. The other voltages needed for the operation of the NIBP measurement are
made on the NIBP board.

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2.2.3 ECG board in 12-lead measurement

The 12-lead ECG measurement consists of the elements shown in Figure 6. All functions are
located in the ECG board except the ECG input unit .
PATIENT AND ECG ELECTRODES

ECG CABLE
- ECG LEAD SET
- ECG TRUNK CABLE

ECG INPUT UNIT

- ECG CONNECTOR
- INPUT PROTECTION RESISTORS

INPUT PROTECTION DIODES FOR ECG & RESPIRATION MEASUREMENT

INPUT FILTERING FOR ECG & RESPIRATION MEASUREMENTS

RESPIRATION RESPIRATION LEADS OFF & PACER &

ECG PREAMPLIFIERS &
MEASUREMENT MEASUREMENT CURRENT DEFIBRILLATION
RLD CIRCUIT
AMPLIFIERS SUPPLY DETECTION

BASELINE
RESTORATION

ECG CPU

NV MEMORY

RS 485 COMMUNICATION POWER SUPPLY

ISOLATION ISOLATION

MODULE BUS CONNECTOR

ECG BLOCK DIAGRAM

Figure 6 12-lead ECG measurement block diagram

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ECG input unit

The ECG input unit consists of the front panel connector and the ECG input connector board with
the high voltage protection resistors. The connector for the 12-lead ECG cable is a green 11-pin
rectangle shaped connector.

Input protection and filtering

The input protection is implemented with high voltage protection resistors in the ECG input unit and
with protection diodes in the ECG board. The input filtering for ECG measurement is done with
passive RC filtering.

ECG preamplifiers
The buffer amplifiers are used for each lead. The “Leads off” detection is implemented by
measuring the output level of the input buffer amplifiers with A/D converter of CPU. The ECG signals
are measured using differential amplifiers.

ECG amplifiers and baseline restoration

The function of the ECG amplifiers and baseline restoration is to amplify the signal and to restore
the baseline of the signal in the middle of the display after the change of the signal level e.g. after
the change of the DC offset voltage.

Pacer detection
Pacer detection has been made by using three slew rate detector circuits. The pacer detection
amplifiers have been realized at the front of the slew rate detectors independently from the ECG
measuring channels.

Respiration impedance supply

The 31.25 kHz sine wave generator is used as the respiration measurement signal supply. Analog
switches are used for connecting the sine wave to the ECG leads to be measured.

Respiration impedance amplifiers

Buffer amplifiers are used in respiration measurement. Analog switches are used for selecting the
measurement leads. There are also additional amplifiers for increasing the respiration signal gain.
When ECG measurement is 5/12-lead, the respiration measurement is always done between R
and F, independently on the ECG lead selection. When ECG measurement is 3-lead, then the
respiration measurement is done at the same lead as the ECG measurement (I, II or III).

ECG CPU
The CPU is a 16 bit H8/3052 single-chip microcomputer. It contains 128 kbytes of flash memory
and 4 kbytes of RAM. The clock frequency is 16 MHz.

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RS485 communication
The communication to the CPU board of the monitor uses RS485 protocol. The RS485 driver
circuits are optically isolated from the processor of the module. PWM signal is used for direct ECG
signal. Direct ECG signal is available from the X2 connector of the UPI board or from the PT module.

Power supply
The ECG board has a driver controlled half bridge switching power supply with 5 kV isolation. The
supply voltages have been regulated with linear regulators.

2.2.4 ECG filtering

The S/5 monitors have three ECG filtering modes:
MONITORING 0.5 to 30 Hz (with 50 Hz reject filter)
0.5 to 40 Hz (with 60 Hz reject filter)
DIAGNOSTIC 12-lead ECG 0.05 to 150 Hz
ST FILTER 0.05 to 30 Hz (with 50 Hz reject filter)
0.05 to 40 Hz (with 60 Hz reject filter)
The purpose of filtering is to reduce high frequency noise and low frequency (e.g. respiratory)
movement artifacts.
Monitor filter is used in normal monitoring. Diagnostic filter is used if more accurate diagnostic
information is needed. ST filter gives more accurate information of ST segment, but reduces high
frequency noise.
The high-pass filters 0.5 Hz and 0.05 Hz are done with software. The monitor sends a command to
the hemodynamic module determining which of the corner frequencies 0.5 Hz or 0.05 Hz is to be
used.
The 50 Hz and 60 Hz reject filters are both low-pass filters with zero at 50 Hz or 60 Hz
correspondingly. They are software based filters used for the mains supply filtering. With these
filters the 3 dB value for low-pass filter is 30 Hz or 40 Hz.
In diagnostic mode the upper frequency is 150 Hz and it is limited by software.

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2.2.5 STP board

PATIENT AND TEMPERATURE PATIENT AND INVASIVE CANNULA
PATIENT AND SpO2 PROBE
SENSOR OR CATHETER

FLUSHING KIT & INVASIVE

SpO2 TRUNK CABLE TEMPERATURE CONNECTOR
PRESSURE SENSOR WITH DOME

SpO2 CONNECTOR INPUT PROTECTION CIRCUITRY INV.PRESSURE CONNECTOR

SpO2 PROBE RECOGNITION & LED

DRIVE SELECTION MATRIX
SENSOR
TEMPERATURE INV: PRESSURE SENSOR SIGNAL
SIGNAL
MEASUREMENT MEASURE MENT VOLTAGE
CURRENT
AMPLIFIER AMPLIFIER SOURCE
SOURCE

SpO2 LED DRIVE SpO2 AMPLIFIER

A/D CONVERSION

STP CPU

NV MEMORY

RS 485 COMMUNICATION POWER SUPPLY

ISOLATION ISOLATION

MODULE BUS CONNECTOR

STP BLOCK DIAGRAM

Figure 7 STP board block diagram

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Microprocessor unit
The CPU is a 16 bit H8/3052 single-chip microcomputer. It contains 128 kbytes of flash memory
and 4 kbytes of RAM. The clock frequency is 16 MHz.
High speed I/O is used to obtain pulse control sequence necessary for pulse oximetry
measurement. Timing for the clock is from the oscillator.

Temperature measurement unit

The NTC-resistor value in the probe depends on the patient’s temperature. It is measured with the
following principle described below.
The constant current source is supplied about 7µA current through the temperature sensor (YSI
400-series NTC resistor). The constant current is caused a voltage over the temperature sensor
(NTC resistor). The voltage over the temperature sensor is amplified in a differential amplifier stage.
The amplified voltage is transferred to a controller of the STP board through an A/D converter.
constant
Defibrillation/ESD protection current
resistors and diodes source

100k

Differential
10k amplifier

0C:7k36 d/dt 0
0 To A/D
15C:3k54
Temperature converter
25C:2k53 0
sensor 38C:1k30
45C: 984 0

10k
temp_meas_principle.vsd

100k

Figure 8 Temperature measurement principle

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Invasive blood pressure measurement unit

An isolated +5 V voltage is supplied to the pressure transducer. The differential voltage, which
depends on the pressure and the supplied voltage, is calculated from the bridge connection (see
the formula below).
Uout = Uin × pressure × 5 V, where Uin is 5 V
⇒ Uout = 25 V × pressure [mmHg]
Pressure amplification is realized in the instrumentation amplifier. The gain of the amplifier is set to
keep the level of the signal transferred to A/D converter within the measurement range even when
there are circumstantial offsets or offsets caused by the transducer. There is a filter before the
amplifier to attenuate high frequency disturbances.
Pressure
Vin transducer
Instrumentation
amplifier

Vout Input
Filter G

pressure_meas_principle.vsd
to A D converter

Figure 9 Pressure measurement principle

Pulse oximetry measurement section

LED control signals

The D/A converters of the microcontroller on STP board set the LED intensity adjustment values for
the infrared- and red LEDs of SpO2 probe. The microcontroller on the STP board switches ON ( to
the adjusted intensity ) and OFF the SpO2 probe LEDs according to the predetermined sequence.

LED driving circuit

Differential amplifiers measure the LED currents (LED current indication) of SpO2 probe over the
shunt resistors placed in the LED current paths. The LED driving voltages (LED voltage indication)
are measured from the driver circuitry. The LED driving circuits also have MOSFET transistor matrix
to enable the use of different probe configurations.

Measured signal preamplification

The preamplifier is bipolar/single-ended current-to-voltage converter with adjustable gain. A higher
gain is used for measuring thin tissue. The preamplification stage has also ambient light reduction
and second amplifier stage.

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LED Driving circuit 1 LED Intensity adjustment 1

LED ON/OFF control 1

LED voltage indication 1

LED current indication 1

LED Driving circuit 2 LED Intensity adjustment 2

LED ON/OFF control 2

LED voltage indication 2

SpO2
Probe LED current indication 2

LP Oximeter channel 1
Gain=7.5

DC-
suppression

LP Oximeter channel 2
Gain=7.5

Ambient reduction DC-

suppression

LP Oximeter channel 3
Amplifier: Gain=7.5
Preamplifier: Gain = 2
Current-to-voltage type

Spo2_measurement_blck_diagr.vsd
Bipolar/single-ended modes DC-
Adjustable gain suppression
Oximeter channel 4
LP

DE-MUX Amplifiers

Analog Digital

Figure 10 Pulse oximetry measurement block diagram

Red and infrared channel separation

The detector signal is possible to multiplex to four different channels depending on the content of
the signal. The detector signal must at least multiplex into infrared- and Red signals. Other
channels are for e.g. diagnostic purposes.

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Serial communication
An RS485 type bus driver makes the serial communication between the module and the frame.
Data transmission rate is 500kbps.

NIBP BOARD
NIBP BOARD CONTROLLERS

CONNECTOR TO STP/ECG BOARD

MODULE BUS CONNECTOR

RECEIVE DATA DATA
RS 485
DRIVER

NIBP_communication.vsd
SEND DATA NDATA

SEND/RECEIVE

Figure 11 Serial communication of NIBP board

STP BOARD
STP BOARD CONTROLLER

STP BOARD CONNECTOR

PATIENT ISOLATION

RECEIVE DATA DATA

RS 485
DRIVER
STP_communication.vsd
SEND DATA NDATA

SEND/RECEIVE

Figure 12 Serial Communication and Isolation of STP board

ECG BOARD
ECG BOARD CONTROLLER

DIRECT ECG (PWM) DIRECT ECG (PWM)

ECG BOARD CONNECTOR
PATIENT ISOLATION

RECEIVE DATA DATA

RS 485
DRIVER
ECG_communication.vsd

SEND DATA NDATA

SEND/RECEIVE

Figure 13 Serial Communication and Isolation of ECG board

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Signals and isolation barrier

The communication signals transfer over the isolation barrier by using high isolation voltage (6kV)
opto isolators.

Power supply section

The power for the electronics on the floating part of the STP and the ECG boards is made on each
board with the switching power supplies connected to a high voltage isolated transformer. The
switching power supplies on the STP and ECG boards are synchronized to the frequency, about
340kHz of the switching power supply on the NIBP board. The PRESTN module uses only +15VD
voltage of the frame. The other voltages of the measuring boards are made by the switching power
supplies and regulators or the linear regulators. Each measuring board is protected against
overloading with PTC type automatic fuses.

2.3 Connectors and signals

2.3.1 Module bus connector (on the NIBP board)

13 1
25 14

Figure 14 Module bus connector (X1) pin layout

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Table 2 Module bus connector description

Only the shaded signals of the table below are valid for the PRESTN module
Pin No I/O Signal Note
1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC
5 I/O NDATA_RS485
6 I/O DATA_RS485
7 Ground & Shield
8 I -RESET_RS485
9 I CTSB
10 O RTSB
11 I RXDB
12 O TXDB
13 Ground & Shield
14 I +32 VDIRTY
15 I GroundDIRTY
16 I CTSC
17 O RTSC
18 I RXDC
19 O TXDC
20 ON/STANDBY
21 O PWM_ECG
22 RXDD_RS232
23 TXDD_RS232
24 I +5 VDC
25 I +5 VDC

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2.3.2 Front panel connectors

Table 3 Front panel connectors

ECG Connector Pin No Signal Name

1 R/RA; Right arm electrode
2 C2/V2; Chest electrode
3 C3/V3; Chest electrode
4 L/LA; Left arm electrode
5 N/RL; Neutral/ Right Leg Drive electrode
6 C1/V1; Chest electrode
7 C4/V4; Chest electrode
8 F/LL; Left Leg electrode
9 C6/V6; Chest electrode
10 C5/V5; Chest electrode
11 Cable Shield

SpO2 connector (SpO2) Invasive blood pressure Temp connector

connectors (P1, P2) (T1, T2)

3 6 3 6
1 9 1 9
4 7 4 7
2 0 2 0
5 8 5 8

Pin No Signal Pin No Signal Pin No Signal

1 Feedback resistor 1 Pressure + 1 Temperature probe
2 Ground 2 Pressure - 2 Temperature probe
3 Not Connected 3 Polarisation - (ground)
4 Cable shield + 4 Polarisation +
probe identification
ground
5 Probe identification 5 Not connected
6 LED drive ground 6 Not connected
7 LED drive current 7 Not connected
8 Input signal current 8 Not connected
9 Ground 9 Ground
10 Ground 10 Cable detection

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2.3.3 Test points on boards

12-lead ECG board

Test pins (strips) of X103: Test pins (strips) of X102:

Component side: 2: 2.5V
Component side:
6: +5VD 4: 2.5Vref
Solder side: 1: GNDF Solder side: 1:+5VA
3: +2.5V_R
5: GNDF
4 1
6 3 2
5
1

ECG INPUT BOARD CONNECTOR

MODULE BUS CONNECTOR OF ECG BOARD

X103 X102
PROGR. TEST

PIN1

ISOLATION TRANSFORMER
ECG_board_conn_testpoints_01.vsd

PIN ORDER FOR MODULE BUS CONNECTOR OF ECG BOARD:

1: +15VD 6: PS_OSC(340kHz)
2: GNDN 7: NC
3: DATA 8: GNDN
4: NDATA 9: PWM_ECG
5: GNDN 10: +5VRS

Figure 15 ECG board connectors and test points

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NIBP board

CONNECTOR FOR NIBP FLEX

GND +5V
MODULE BUS CONNECTOR

X103
PROGR

(Pulse)
Pump

valve

Air Filter
Intake
MOD.BUS CONNECTOR
OF STP BOARD

NIBP MANIFOLD
PIN1
PIN1
X106

NIBP_brd_conn_testpoints_01.vsd
Safety
valve

Test connector X106 :

1: POS.PUMP VOLTAGE
2: (Pulse) VALVE VOLTAGE
4: NEG.PUMP VOLTAGE
6: Safety VALVE VOLTAGE
8,9,10: GND

Figure 16 NIBP board connectors and test points

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STP board

STP INPUT CONNECTOR

ISOLATION TRANSFORMER
MODULE BUS CONNECTOR

PIN1

TEST CONNECTOR
PIN2 PIN34

PROGR
X107 PIN1

STP_brd_conn_testpoints_01.vsd
TEST CONNECTOR PIN ODER:

19: +2.3V(ref.voltage) 25: +5V

20: GNDF 26: GNDF
21: +6V(non regulated) 27: +5V(analog)
22: GNDF 28: GNDF
23: +4.5V(ADC ref. voltage) 29: +5VLED
24: GNDF 30: GNDF

Figure 17 STP board connectors and test points

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the hemodynamic modules is limited to replacing faulty printed circuit boards or
mechanical parts. Faulty printed circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
Only trained personnel with appropriate equipment should perform the tests and repairs outlined in
this section. Unauthorized service may void warranty of the unit.

3.2 Service check

These instructions include complete procedures for a service check. The service check should be
performed after any service repair; however, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form , which should be filled in when performing the procedures.

The mark " in the instructions means that the performed procedure should be signed in the
check form.

3.2.1 Recommended tools

Tool Order No. Notes
Patient simulator -
Pressure manometer -
Temperature test set 884515
Multi-link 3-leadwire set
Multi-Link 5-leadwire set V2-V6
Multi-Link 5-leadwire set C2-C6
Multi-Link 12-lead ECG trunk cable
SpO2 finger probe OXY-F4-N or SAS-F4
InvBP transducer
Adult NIBP cuff & hose
Infant NIBP cuff & hose
Screwdriver

3.2.2 Recommended parts

Part Order No. Notes
NIBP pump filter 57142

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All modules
Detach the module box by removing the two screws from the back of the module. Be careful with
loose latch and spring pin for locking.
1. Check internal parts:
− screws are tightened properly
− cables are connected properly
− all IC’s that are on sockets are attached properly
− EMC covers are attached properly
− there are no loose objects inside the module

"
2. Check external parts:
− the front cover and the front panel sticker are intact
− all connectors are intact and are attached properly
− the module box, the latch and the spring pin are intact

"
3. Replace the NIBP pump filter in PRESTN/RESTN/PRETN modules, if necessary.

"
• Reattach the module box and check that the latch is moving properly.
• Switch the monitor on and wait until the monitoring screen appears. Configure the monitor
screen so that all the needed parameters are shown, for example as follows:
Monitor Setup - Waveform Fields - Field 1 - ECG1
Field 2 - ECG2
Field 3 - P1
Field 4 - P2
Field 5 - Pleth
Field 6 - Resp
Digit Fields - Lower Field 2 - NIBP
Lower Field 3 - T1+T2

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4. Plug in the module. Check that it goes in smoothly and locks up properly

"
5. Check that the module is recognized, i.e. all needed parameter information, except invasive
blood pressure, starts to show on the screen.

"
Preset ECG, Respiration, InvBP and SpO2 measurement settings:
ECG - ECG Setup - Hr Source - Auto
Pacemaker - Show
Others - Resp Setup - Size - 1.0
Resp Rate Source - Auto
Measurement - On
Detection Limit - Auto
Invasive Pressures - P1 ‘Art’ Setup - Label - Art
P2 ‘Cvp’ Setup - Label - Cvp
Pulse Oximetry - Pleth Scale - Auto

ECG measurement
6. Enter the service menu:

Monitor Setup - Install/Service (password 16-4-34) -

Service (password 26-23-8) - Parameters

Take down the information regarding module software by selecting Scroll Vers and turning the
ComWheel.

"
7. Enter the ESTP: ECG service menu:

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the ECG/RESP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ state all OK.

"
8. Check that the power frequency value is set according to the current mains power
frequency. Change the setting by selecting Power Freq, if necessary.

"

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9. Connect a 12-lead ECG trunk cable without a lead set to the module. Check that the
message "Leads off" is displayed on the screen.

"
10. Connect both 5-leadwire sets to the trunk cable. Connect limb lead electrodes and one
electrode from the chest lead set to the same potential. Check that the ‘Cable type’ shows
10 lead.

"
11. Change the 3-leadwire set to the trunk cable. Check that all the electrodes show OFF in the
service menu and the message ‘Leads Off’ is shown on the screen.

Connect all the leads together, for example to a suitable screwdriver. Check that all the
electrodes show ON and the message ‘Asystole’ appears.

Disconnect one of the leads and check that the corresponding electrode in the service menu
shows OFF within 10 seconds from the disconnection, and then reconnect the lead. Check
the rest of the leads using the same method.

NOTE: When the ground lead (black) is disconnected all the electrodes should show OFF.

NOTE: The ‘Asystole’ and ‘Different leads off’ messages are shown using certain priority, so
even when one of the leads is disconnected, the lead related ‘Leads off’ message may not
appear onto the screen.

NOTE: When RA, LA or LL electrode is disconnected, all six V electrodes show OFF.

NOTE: With PRESTN/RESTN/PRETN modules and 5 lead cable the state of V2, V3, V4, V5
and V6 electrodes follow the state of the V electrode.

Connect the leads to a patient simulator.

Perform the settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

ECG - BASE - BPM - 160

PACE - WAVE - NSR
Check that normal ECG waveform is shown, the HR -value is 160 (±5) and the ‘Pacer count’ -
value is not increasing in the service menu.
ECG - PACE - WAVE - ASNC
Check that pacemaker spikes are shown on the ECG waveform, the ‘HR’ -value changes to
75 (±5) and the ‘Pacer count’ -value is increasing according to shown pacemaker spikes.

Set the pacemaker option off:

ECG - PACE - WAVE - NSR

"

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Respiration measurement
12. Check that the ‘Resp Available’ and ‘RESP Measurement’ show both ON in the ESTP: ECG
service menu.

"
13. Check the respiration measurement with a patient simulator.

The settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

BASELINE IMPEDANCE -switch - 500

LEAD SELECT-switch - II/RL-LL

RESP - WAVE - NORM

RATE - 20
OHMS - 1.0
RATIO - 1/1
APNEA - OFF
SHIFT - OFF
Check that the RESP waveform is shown and the ‘RR’ -value is 20 (±5). Change the position
of the BASELINE IMPEDANCE -switch and check that appropriate RESP waveform and ‘RR’ -
value are shown again within 30 seconds.
RESP - APNEA - 32 S
Check that the monitor activates the APNEA -alarm.

NOTE: Make sure that only the ECG leads are connected to the simulator during the apnea -
test. If other cables are connected at the same time, the respiration signal from the
simulator may be disturbed, and therefore, the APNEA -alarm may not be activated.
NOTE: When you have ECG service menu open, spikes will appear on the respiration
waveform. These spikes represent the threshold level for detecting inspiration and
expiration.

"
Temperature measurement
14. Enter the ESTP: STP service menu:

Parameters - ESTP : STP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values do not increase
faster than by 5 per second. Check also that the STP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.

"
15. Check that the ‘Cable’ and ‘Probe’ show OFF for both channels, T1 and T2, when no probes
are connected.

Connect a temperature test plug into the connector T1. Check that the ‘Cable’ and ‘Probe’ for

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T1 show ON and the corresponding temperature value appears onto the monitor screen.
Perform the same check also for the channel T2.

"
16. Check the temperature calibrations using temperature test plugs.
If the deviation on a temperature reading on the screen is more than 0.1 °C, calibrate the
temperature channels according to the instructions in the chapter 3.4.2 Temperature
calibration.

"
17. Activate the temperature test by selecting Temp Test from the menu and pressing the
ComWheel twice. When the message ‘Performing temp test’ disappears from the digit field,
check that no error messages appear and ‘Temp error’ shows OFF for both channels in the
service menu.

"
18. Check that the module configuration has been set correctly. The configuration in use is shown
beside the text ‘Configuration’ in the service menu and it can be either STP, ST or TP. Change
the configuration in the Calibrations menu, if necessary.

"
Invasive blood pressure measurement
19. Check the front panel membrane keys that are related to the InvBP measurement.
Press each of the keys at least for one second. Check that the pressed key is identified, i.e.
one of the texts for ‘Buttons’ changes from OFF to ON in the service menu.

"
20. Check that the ‘Cable’ and ‘Probe’ for P1 show OFF. Plug a cable with an invasive blood
pressure transducer into the front panel connector P1 and check that the ‘Cable’ and ‘Probe’
show ON and the corresponding pressure waveform appears onto the screen.

Perform the same check also for the InvBP channel P2.

"
21. Calibrate the InvBP channels P1 and P2 according to the instructions in the chapter.
Invasive pressure calibration

"
22. Check the InvBP channels with a patient simulator.

The settings and checks with Dynatech Nevada MedSim 300 Patient Simulator:

SENSITIVITY -switch - 5 µV/V/mmHg

ECG - BASE - BPM - 60 - BP - 1 - WAVE - ATM

2 - WAVE - ATM
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Restore the normal monitoring screen by pressing the key Normal Screen.

Connect cables from the channels BP1 and BP2 to the module connectors P1 and P2. Zero
the InvBP channels by pressing the keys ZERO P1 and ZERO P2 on the module front panel.
BP - 1 - WAVE - ART
2 - WAVE - CVP
Check that appropriate InvBP waveforms are shown and the InvBP values are approximately
120/80 (±3 mmHg) for the channel P1 and 15/10 (±2 mmHg) for the channel P2.

Check that HR- value is calculated from P1 when ECG is not measured (ECG cable
disconnected).

"
SpO2 measurement
23. Check that the message ‘No probe’ is shown when no SpO2 sensor is connected to the
module. Connect a SpO2 finger probe to the module. Check that the message ‘Probe off’ is
shown when the probe is not connected to a finger.

"
24. Connect the SpO2 probe onto your finger. Check that the reading of
95-99 and SpO2 waveform appears. Check that HR- value is calculated from SpO2 when
ECG and InvBP (P1) are not measured.

"
Non Invasive Blood Pressure measurement
25. Enter the NIBP module service menu:
Parameters - NIBP

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 5 per second. Check also that the NIBP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.

"
26. Check the front panel membrane keys.

Select Buttons/Leds.

Press each of the two NIBP related membrane keys at least for one second. Check that the
pressed key is identified, i.e. the corresponding text changes from OFF to ON in the menu
when the key is released back up again.

"
27. Check the pump and valves.

Highlight Pneumatics from the NIBP menu. Connect a pressure manometer to the NIBP

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module cuff connector.

Select Start Pump and press the ComWheel. Check that the pump turns on and the
pressure inside the tubing system starts to increase. Stop the pump by pressing the
ComWheel again when the pressure reaches 280 mmHg.

Highlight Open Exh2. Press the ComWheel and check that the pressure inside the tubing
system starts to drop then press the ComWheel again. If necessary, turn the pump on again
for a moment to increase the pressure inside the tubing system.

Highlight Set Valve. Press the ComWheel and set the value under the text ‘Pulse Valve’ to
number 150 by turning the ComWheel. Press the ComWheel again and check that the
pressure inside the tubing system starts to drop. Finish the test by selecting Previous Menu.

"
28. Check the NIBP tubing system for leakages.

Select Calibrations from the NIBP service menu.

Connect the pressure manometer to the NIBP module cuff connector. Start the active leak
test from the menu by pressing the ComWheel. The module pumps a pressure of about 265
mmHg and then the pump stops.
Wait for 15 seconds for the pressure to stabilize then check that the pressure does not drop
more than 6 mmHg per one minute. Release the pressure by pressing the ComWheel once
more.

"
29. Calibration check.

Recalibrate the NIBP measurement. Remember to set the calibration protection back on
after the calibration.

Disconnect the pressure manometer. Select Calibrations and then highlight Calibration
Check. Press the ComWheel and take down the zero offset values for both pressure
transducers, B1 and B2. The values should be within ±20 mmHg.

Connect the pressure manometer to the cuff connector and check the calibration with
pressures 100 mmHg, 200 mmHg and 260 mmHg. The zero offset value must be added to
the displayed pressure value in order to determine the real pressure.

"
30. Check the safety valve.

Select Safety Valve from the NIBP service menu.

Keep the pressure manometer connected to the cuff connector.

NOTE: Make sure your pressure manometer can be used to measure pressures over 300
mmHg. If such a pressure manometer is not available, perform the check with an adult cuff
that is connected around some round object, for example a calibration gas bottle.

Highlight Start Test. Start the adult safety valve test by pressing the ComWheel. Wait until

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the pump stops and the pressure is deflated. Check the pressure values ‘Max press’ and ‘2 s
after stop’ for both transducers. All the values should be within 270 - 330 mmHg.

Highlight ADULT. Press the ComWheel and check that the text changes now to INFANT.
Select Start Test and wait until the pump stops and the pressure values on the screen have
been updated. Check that the values ‘Max press’ and ‘2 s after stop’ are all now within 135
to 165 mmHg.

Return to the normal monitoring mode by pressing Normal Screen.

"
31. Connect an adult NIBP cuff to the cuff connector and disconnect one of its hoses.
Start NIBP measurement by pressing the key Start/Cancel on the module and check that
the message ‘Cuff loose’ appears on the screen within 70 seconds.
Reconnect the hose and then bend it with your fingers. Restart the measurement and check
that the message ‘Cuff occlusion’ appears on the screen within 70 seconds.

"
32. Check that automatic inflation limits are in use:
NIBP - NIBP Setup - Inflation Limits - Auto - Previous Menu
Connect the cuff onto your arm, highlight Start Ven.Stasis in the NIBP menu and press the
ComWheel. Check the module identifies the cuff, i.e. the text ‘Adult’ appears into the NIBP
digit field for a short moment.

Keep the pressure inside the cuff for about half a minute in order to find out that the cuff is
not leaking, then press the ComWheel again. Select Normal Screen.

"
33. Keep the cuff on your arm and perform one NIBP measurement. Check that the module gives
a reasonable measuring result.

"
34. Connect an infant cuff to cuff connector and wrap it around your fingers.
Start NIBP measurement and check that the module identifies the cuff, i.e. the text ‘Infant’
appears into the NIBP digit field. Cancel the measurement after the cuff identification.

"
All modules
35. Perform electrical safety check and leakage current test.

"
36. Check that the module functions normally after the performed electrical safety check.

"
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37. Clean the module with suitable detergent.

"
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

CAUTION When reassembling the module, make sure that all cables are reconnected
properly.

3.3.1 M-PRESTN/-RESTN/-PRETN modules

Disassemble the M-PRESTN/-RESTN/-PRETN module in the following way. See the exploded view
of the module in chapter 6.1.1.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearwards and detach it from the main body. Be careful with
loose latch and spring pin for locking.
3. To detach the ECG board, detach four screws, disconnect ribbon cable from the STP board
(supply voltage), and ribbon cable from the ECG input board.
4. When the ECG board is removed, the STP board can be detached by removing four screws,
disconnecting the cable from the membrane keypad, the cable from the temperature
connectors, and cables from the SP input board. Also disconnect the NIBP hoses and the
ribbon cable from the NIBP board.
5. When the ECG board and the STP board are removed, the NIBP board can be detached by
removing four screws. Disconnect the hoses from the pressure transducers and the pump. If
the filter for the air inlet of the pump is removed, it must be replaced.

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3.4 Adjustments and calibrations

3.4.1 NIBP calibrations

The electronics of the NIBP pressure measurement is calibrated at the factory. The processor
automatically maintains the zeroing pressure. If the zero point of the pressure transducer drifts
more than specified, an error message is given and the NIBP board should be recalibrated or
replaced.
Recalibrate the NIBP measurement once a year. The checking and recalibrating can be done in the
NIBP service menu.
The calibration of the primary pressure channel can also be checked from the NIBP setup menu
(NIBP - NIBP Setup - Calibration Check). In this case the auto zeroing is performed at start -
remove hose before entering to ensure atmospheric pressure to the pressure transducers - the
primary pressure is displayed. The zero-offset value should then be zero.
Check the intake air filter as part of the calibration check. Change the filter if it is visibly dirty.

Calibration check
1. Enter Calibration menu.

2. Select Calibration Check and press the ComWheel.

3. Connect an external precision manometer to the module.

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4. Pump the following pressures to manometer and check the difference between the
manometer and monitor pressure display (The zeroing offset is automatically subtracted from
the pressure readings).
Table 4 NIBP calibration check pressures

Pressure Max. error Example

0 mmHg ±5 mmHg (=zero offset) -1
100 mmHg 100 ±2 mmHg 100 ±2
200 mmHg 200 ±3 mmHg 200 ±3

If the error of pressure channel B1 is larger than specified above, the module should be
recalibrated. The error of B2 is allowed to be even twice as large because it has no effect on blood
pressure measurement accuracy. However, we recommend recalibrating the module when the error
of B2 is larger than specified above to ensure best possible operation.

Calibration
1. Enter Calibration menu.
2. Remove hoses from front panel connector to enable proper zeroing.
3. Select Calibration. If it is not available, perform the steps A, B, and C.
NOTE: Do not pull out the NIBP module from the monitor frame. The module must be in the frame
during the whole procedure.
A. Press NIBP module buttons Auto ON/OFF and Start Cancel simultaneously for 3 seconds to
enable the calibration. This enables menu selection Protection. The message ‘Calibration
switch ON!’ appears.
B. Select Protection OFF in the Calibration menu and press the ComWheel.
C. Press the buttons again for 3 seconds. Menu selection Calibration is now enabled, and
Protection is disabled. When the calibration is enabled, a message ‘Calibration not
protected’ appears.
• Start Calibration by pressing the ComWheel. Messages ‘Zeroing’ and ‘Zeroed’ will appear in
the NIBP message field. After this a pressure bar and text ‘Calibrating’ will appear.
• Connect an external mercury manometer with pump to module through the both tubes of the
hose - both transducers B1 and B2 must be calibrated simultaneously. Pump up to a
pressure about 200 mmHg according to the manometer. Calibration is possible in the range
150 to 250 mmHg.
• Verify that both pressure values in the prompt field match the manometer reading. If not,
adjust by turning the ComWheel. When the values of the pressure bar and the manometer
are equal, press the ComWheel to confirm the calibration. The message ‘Calibrated’ will
appear onto the NIBP digit field after a few seconds, which means that the calibration
succeeded, and the new calibration data is saved in EEPROM.
NOTE: When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct. For example change the value one step
higher and then back one step lower. “Calibrated” text should appear in the display. This ensures
that the calibration procedure is correctly registered and stored by the module.
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• To set the protection on:

Press NIBP module buttons Auto ON/OFF and Start Cancel simultaneously for 3 seconds.
Select Protection ON and push the ComWheel. Then press the buttons again for three
seconds.
• Remove the module from the frame and plug it back again. Then perform Calibration check
(see the preceding page) to verify the new calibration.

3.4.2 Temperature calibration

NOTE: For the temperature calibration, separate, accurate test plugs (25 °C and 45 °C) are
needed. A test set of two plugs is available from Datex-Ohmeda, order code 884515.
Calibrate the temperature when measured test values differ for more than ±0.1 °C, and always
after STP board replacement.
1. Enter ESTPR: STP service menu.
2. Enter Calibrations menu.
3. Choose Protection OFF in protect mode.
4. Select Calibrate T1/Calibrate T2.
5. Insert calibration plug (25 °C) into T1/T2 connector.
6. Press the ComWheel.
7. Insert calibration plug (45 °C) into T1/T2 connector.
8. Press the ComWheel.
9. Choose Protection ON in protect mode.

3.4.3 Invasive pressure calibration

Calibrate invasive pressure when the pressure transducer (probe) is replaced with a different type
of transducer, and when STP board is replaced.
1. Enter ESTPR: the STP service menu.
(Monitor Setup, Install/Service (password 16-4-34), Service (password 26-23-8),
Parameters).
2. Enter Calibrations menu.
3. Connect a pressure transducer with a pressure manometer to the P1/P2 connector. Choose
Calibrate P1 or Calibrate P2. Leave the transducer to room air pressure.
4. Press the ComWheel to start zeroing.
5. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
6. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel. A tolerance of ±1 mmHg is allowed.
7. The message ‘Calibrated’ will appear on the display.

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4 TROUBLESHOOTING

4.1 Troubleshooting charts

See also the User’s Reference Manual for more troubleshooting procedures.

4.1.1 NIBP
TROUBLE CAUSE TREATMENT
No NIBP value displayed NIBP not selected on screen. Check monitor setup.
NIBP menu fading No M-PRESTN module, module not Plug in the module.
properly connected, or NIBP and
PRESTN module connected at the
same time.
Artifacts-message Unsuccessful measurement due to
patient movement, shivering,
external artifact or weak signal.
Weak pulsation-message Weak or unstable oscillation pulses Check patient condition and retry.
due to:
Check any leaks and retry.
• artifacts Use proper size of cuff. Check
• weak pulse pressure due to attachment.
arrhythmias
• improper cuff position or
attachment
• too few pulses detected
• weak or unusual blood
circulation
• obese subject
Call service NIBP hardware error. See the description of the error message
Error X-message X = error number. code in 4.1.2, the causes and the
solutions listed in the next chapter.

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TROUBLE CAUSE TREATMENT

Cuff loose-message 1. Hose and/or cuff not connected. 1. Connect the hose and the cuff.
2. Hose and cuff connected.
Reasons:
− cuff loosely wrapped − tighten the cuff
− leakage in cuff or hose − replace cuff/hose
− leakage inside module − check internal tubing and air
chamber, and fix if necessary
− pump does not work − check pump connector; if OK, replace
pump
Air leakage-message 1. Hose or cuff leaking. Reasons: 1. Replace cuff
− cuff damaged − replace cuff
− cuff connector damaged − replace cuff connector (if the fault is
in hose connector,)
− O-ring damaged or missing − replace O-ring
− hose double connector − replace hose
damaged
2. Hose and cuff OK. Reasons: 2. Connect or replace tube
− leakage inside the module − replace the whole tubing
− tube disconnected or damaged − fix connections
− tubes or valve(s) damaged − replace tubes/valve(s)
Unable to measure Sys- Systolic blood pressure probably Automatic retrial with increased
message higher than the inflation pressure or pressure.
artifacts.

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TROUBLE CAUSE TREATMENT

Cuff occlusion-message 1. Cuff and/or hose occluded.
Reason:
− cuff tube kinked − straighten tube
− tube inside module kinked − straighten tube
− occlusion inside/outside − remove occlusion
module
2. Cuff, hose, and tubes OK.
Reason:
− fault in pressure transducer − replace the NIBP board
− fault in A/D converter − replace the NIBP board
− faulty calibration − check calibration
Calibration switch on – EEPROM protection has been Enables setting the protection OFF in the
message handled by pressing module Calibration menu. Press the buttons again
buttons Auto ON/OFF and Start if you are not going to calibrate.
Cancel simultaneously for 3
seconds.
Calibration not protected - Calibration protection is set to Set the protection ON in the NIBP
message. OFF. Calibration menu.

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4.1.2 NIBP error code explanation

Code Explanation Treatment
0 RAM failure; memory failure Change the NIBP board.
1 ROM checksum error; memory failure Change the NIBP board.
2 Pump current failure Check short circuits. Change the NIBP
board.
3 Safety CPU internal test failure or pressure sensor Change the NIBP board.
reference voltage failure
4 EEPROM protection error Press module buttons Auto ON/OFF and
Start Cancel simultaneously for 3
seconds.
5 Calibration not protected Protect calibration by selecting Protection
ON in the NIBP calibration menu.
6 Pressure sensors give different readings Try to remeasure, if the problem persists
recalibrate. If the problem still persists
change the NIPB board.
7 Calibration failure Reset module and recalibrate. If this does
not help, change the NIBP board.
8 Exhaust Valve occlusion Check tubing. If this does not help,
change the NIBP board.
9 Measurement related SW error Automatic recovery.
10 EEPROM checksum error; memory failure Change the NIBP board.
11 Auto zero range exceeded Calibrate the NIBP.
12 Communication break; temporal break down of Automatic recovery.
communication from monitor detected
13 Illegal neonate cuff with identifying magnet Remove the cuff.
connected
14 -
15 Safety CPU pressure calibration error Recalibrate. If this does not help, change
NIBP board.
16 Communication error between CPUs Change NIBP board.
17 Safety CPU has cut down power from pneumatics Reset module. If problem persists change
due to repeating safety limit violations NIBP board.

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4.1.3 ECG
TROUBLE CAUSE TREATMENT
HR numerical display No heart rate available. If no ECG waveform, check LEADS OFF
shows ‘---’ message and connect the leads.

If ECG waveform exists, check heart

rate source e.g. in the ECG Setup
menu behind ECG key.
Unacceptable ECG waveform Poor electrode or poor electrode Electrodes from different
skin contact. manufacturers are used. /Too
much/little gel is used.
Poor electrode condition. Electrodes are dried out.
Improper site of electrodes. Check that electrodes are not placed
over bones, active muscles, or layers
of fat.
Improper skin preparation. Remove body hair. Clean attachment
site carefully with alcohol.
Improper bandwidth filter. Check filter.
No ECG trace Waveform not selected on screen. Press the Monitor Setup key and
make adjustments.
Module not plugged in correctly. Plug in.
Noise-message High frequency or 50/60 Hz noise. Isolate noise source.

4.1.4 Pulse oximetry (SpO2)

TROUBLE CAUSE TREATMENT
Message ‘NO PROBE’ No probe connected to the Check probe connections.
monitor.
Probe faulty. Change the probe.
Message ‘PROBE OFF’ though Unsuitable site. Try another site.
probe properly attached to the
patient
Probe faulty. Try another probe.
Probe connection cable not Connect the cable to probe.
connected to probe.
Finger probe falls off 1. Probe is slippery. 1. Wipe with 70 % isopropyl alcohol
and allow drying.
2. Finger is too thin or thick. 2. Try other fingers, or other probe
types.
Weak signal artifacts Poor perfusion. Try another place.
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TROUBLE CAUSE TREATMENT

Movement artifacts.
Shivering.
Message ‘NO PULSE’ Pulse search > 20 sec. and low Try other fingers.
SpO2 or low pulse rate.
Message ‘ARTIFACT’ Pulse modulation exceeds the Try another place or another probe.
present scale.
Message ‘CHECK PROBE’ DC value not in balance. Try another probe.
Message ‘POOR SIGNAL’ Poor perfusion. Check that the sensor is positioned
Modulation (Red or Ired) < 0.25 % correctly to the patient.
Message ‘FAULTY PROBE’ Probe is faulty. Change the probe.
No SpO2 No waveform selected on screen. Check selected SpO2 waveforms by
pressing Monitor Setup key and
selecting Modify waveforms.
Wrong configuration setting. Check the configuration settings from
the ESTPR:STP/Calibrations menu
(Monitor Setup - Install/Service -
Service - Parameters)

4.1.5 Temperature
TROUBLE CAUSE TREATMENT
Message ‘TEMPERATURE ERROR’ Faulty calibration. Perform calibration. If it does not
help, check that front panel
connector is properly connected to
STP board.
No temperature displayed Wrong type of probe. Use correct probe.
Temperature out of measurable The range is between 10 and 45 °C.
range.
Temperature calibration not Set the protection ON in the Service
protected. Menu.

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4.1.6 Invasive blood pressure

TROUBLE CAUSE TREATMENT
Abnormally low pressure Transducer wrongly positioned. Check mid-heart level and reposition
transducer.
No pressure Defective transducer. Check transducer.
No pressure module plugged in. Check the module.
No waveform selected on screen. Check selected pressure waveforms
by pressing Monitor Setup key and
selecting modify waveforms.
Check that pressure transducer is
open to patient.
Wrong configuration setting Check the configuration setting from
the ESTP:STP/Calibrations menu
(Monitor Setup - Install/Service -
Service - Parameters)
Not zeroed -message Measurement on, channel not Zero the channel.
zeroed.
Zeroing failed -message Unsuccessful zeroing of P1 /P2 Possibly due to pulsating pressure
(number field). waveform. Open the transducer to air
and zero the channel.
Offset is > 150 mmHg. Open the
transducer to air and zero the
channel.
Defective transducer. Replace it and
zero the channel.
Calibration failed -message Unsuccessful calibrating of Turn the transducer to
P1/P2 (number field), possibly sphygmomanometer and try again
due to pulsating waveform (zeroing takes place first).
Gain is beyond the limits (± 20 % of
the default gain). Replace the
transducer.
Out of range < 40 mmHg Measurement pressure is beyond Check transducer level. Zero the
measurement range. channel.
Out of range > 320 mmHg Measurement pressure is beyond Check transducer level. Zero the
measurement range. channel. The patient may also have
high pressure.
Zero adj. > 100 mmHg Offset when zeroing is > 100 Check transducer. The waveform may
mmHg (but < 150 mmHg) from hit the top and the numeric display
the absolute zero of the module not shown.
(with default gain).

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TROUBLE CAUSE TREATMENT

Out of range Measured pressure is beyond the The waveform hits the top and the
internal measurement range of numeric display not shown. Check
the module. transducer and its level. Zero the
channel.

4.1.7 Impedance respiration

TROUBLE CAUSE TREATMENT
No resp trace Waveform not selected on the Press the Monitor Setup key and
screen make adjustments.
Module not plugged in correctly Re-plug the module.
Unacceptable resp waveform Poor electrode or poor electrode Electrodes from different
skin contact manufacturers are used. Too
much/little gel is used.
Poor electrode condition Electrodes are dried out.
Improper site of electrodes Check that electrodes are not placed
over bones, active muscles, or layers
of fat.
Improper skin preparation Remove body hair. Clean
attachment site carefully with
alcohol.
Message: ‘SMALL RESP CURVE’ Respiration signal is very small With 3-lead cable in ESTPR/NESTPR
try another lead connection I, II, III or
try 5-lead cable.
Message: ‘APNEA ALARM’, and Respiration source is CO2 Check respiration source and
respiration waveform normal change it to correct one.

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4.2 Troubleshooting flowcharts

4.2.1 M-PRESTN module troubleshooting for NIBP parameter

Possible faulty
START module with NIBP
parameter.

Remove all
Insert NXXX module
modules from
and turn power on.
Monitor Frame.
Replace
NXXX module.

Does fault NO Fault not in NO

still appear? NXXX module.

OK?
YES NO

Does
Module ID NO Check and
another module
work in same replace Check and
on screen? YES
slot? NIBP board. replace
NIBP board.
YES
NO

Error
message on OK?
NO
screen?
Key check Check keyboard
NO
YES in Service Menu connector. If OK,
OK? change front panel.
See error code explanation
in Service Manual and YES
fix it.
NESTPR_module_troubles_flowch.vsd

Pump check NO Check pump

in Service Menu connector. If OK,
Do OK? change pump.
they work?
YES

NO

Check tubes and Leak test YES

connectors. Find leak and in Service Menu
fix it. OK?

NO

Figure 18 M-PRESTN module troubleshooting flowchart for NIBP Parameter

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4.2.2 M-PRESTN module troubleshooting for parameters ESTPR

Possibly fault in module with

ESTPR parameters.

Check module configuration in

Service menu (ESTPR/STP/Calibrations)

Is it NO Select the correct

correct? configuration

YES
Remove all
modules from
the frame

Insert ESTPR module

and turn power on

Does fault NO Fault not in

still appear? ESTPR module

YES

Enter the Replace

Service menu STP board

NO
NO
Does
STP STP
NO another Remove

NESTPR_MESTPR_module_trou
module ID module ID
module work ECG board
on screen? in same YES on screen?
slot?
YES YES

Replace
bles_flowch.vsd

ECG ECG board

module ID
on screen? NO

YES
Check front panel
key functions in
Service menu

Has ECG NO NO Has invBP NO Has Temp NO Has SpO 2

Do YES Has STP
measurement measurement measurement measurement
they work? board failed?
failed? failed? failed? failed?

YES YES YES YES YES

NO

Check front panel unit, Replace Replace Replace Replace Replace

ECG board, and STP board ECG board STP board STP board STP board STP board
to find culprit. Replace if
necessary.

Figure 19 M-PRESTN Module Troubleshooting Flowchart for Parameters ESTPR

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5 SERVICE MENU

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters - NIBP.

NOTE: Parameter values in Service Data fields are for reference only on this chapter.

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5.1 NIBP service menu

Service Data
Pressure shows measured pressure multiplied by 10. This value is automatically zero-drift
compensated.
Zero shows difference between zeroing value in the permanent memory (stored when module is
calibrated) and the current automatic zero-drift compensation multiplied by 10. The value can
change between +20 and -20 mmHg. If the zero drift exceeds ± 10 mmHg, the module should be
recalibrated.

Protect handle indicates hardware protection for EEPROM memory. It should be ON all the time in
normal operation. If it is OFF data can not be read from or written to EEPROM, only the calibration
protection can be set or reset by software. It can be turned to OFF by pressing NIBP module buttons
Auto ON/OFF and Start Cancel simultaneously for 3 seconds, which also enables Protection
ON/OFF menu selection in the calibration menu.
Calibr. prot. shows software calibration protection and it should be OFF to enable calibration.

+15 V power refers to legacy NIBP modules. Not used in M-PRESTN/M-RESTN/M-PRETN.

AD0 to AD7 show the values of each eight channels of A/D converter. AD7 is not used in M-
PRESTN/M-RESTN/M-PRETN.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the module
has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum in the EPROM is in accordance with the one the software has

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calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

5.1.2 NIBP demo menu

A service menu for demonstrating the oscillometric method of NIBP measurement. The menu
shows the real-time pressure signals that are measured from the NIBP cuff. The measurement
result is shown in the adjoining digit field.
Wave Recording Wave Recording is for selecting the recording option. If ON is
selected, the pressure signals are recorded in real-time onto the M-
REC paper.
Remove menu Remove menu widens the displayed waveform area.
Previous Menu The menu can be closed by selecting the Previous Menu or just by
pressing the ComWheel if the Remove menu was selected.

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5.1.3 NIBP calibration menu

Active Leak Test Wrap an adult cuff around a pipe and connect the cuff to the module. Select the active leak test
(ON). The module automatically pumps a pressure of 260 mmHg into the cuff. Wait for several
seconds until the pressure stabilizes. Then check that the pressure reading does not drop more
than 6 mmHg per minute. If it does, leaking point(s) should be detected and fixed. Cancel the test
by selecting Active leak test OFF.
Calibration Check
After the calibration check is selected (ON), the module zeroes the pressure transducers at the
beginning of the calibration check. Do not pump pressure until the text ‘Calibrating’ appears to the
NIBP digit field or the zeroing will fail. After zeroing is done, manually pump pressure into the
module and make sure that the same pressure values are shown both on the display and on the
manometer. Pressure of both pressure channels B1 and B2 are shown. Note difference to the
legacy modules with NIBP. The pressure values are automatically zero-compensated, so the
readings of B1 and B2 should be the same as the manometer readings.
Protection Software calibration protection (ON/OFF). Select OFF when calibrating. Protection selection
becomes available in the menu after pressing NIBP module buttons Auto ON/OFF and Start
Cancel simultaneously for 3 seconds.
Calibration Calibration selection is available only when protection is OFF and module buttons Auto ON/OFF
and Start Cancel are pressed simultaneously for 3 seconds.
NIBP calibration can be performed in the NIBP Service menu as follows:
NOTE: Both channels B1 and B2 must be calibrated simultaneously.
1. If Protection is ON change it to OFF by pressing NIBP module buttons Auto ON/OFF and
Start Cancel simultaneously for 3 seconds, which enables the Protection selection. Then
press the buttons again for 3 seconds to enable Calibration.
NOTE: The module must be in the frame during the whole procedure.
NOTE: When the buttons have been pressed, the NIBP field shows an error message ‘Calibration
switch on!’.
NOTE: When calibration is enabled, a message ‘Calibration not protected’ appears.

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2. For proper zeroing to take place, remove the hose from the front panel connector. Select
Calibration and push the ComWheel. Messages ‘Zeroing’ and ‘Zeroed’ will appear in the NIBP
message field. After this a pressure bar will appear beside the menu and the text ‘Calibrating’
will appear to NIBP digit field.
3. Connect an external mercury manometer with pump to module through the both tubes of the
hose. Pump up to about 200 mmHg pressure (range of 150 to 300 mmHg allowed) according
to the manometer. Verify that both pressure values in the prompt field match the manometer
reading. If not, adjust by turning the ComWheel.
4. When the values are equal, push the ComWheel to confirm the calibration. After a few
seconds ‘Calibrated’ message will appear to the NIBP digit field, which means that the
calibration data has now been saved.
NOTE: When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct. For example change the value one step
higher and then back one step lower. “Calibrated” text should appear in the display. This ensures
that the calibration procedure is correctly registered and stored by the module.
5. Use the module buttons again to enable Protection setting and set it ON, and finally disable
Protection setting.

5.1.4 NIBP safety valve menu

Start Test Start test is for starting and Stop test is for stopping the Safety Valve test.

Safety Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Max. press and 2 s after stop show the measured values at Safety Valve test.
Safety Valve Test Adult/Infant
Wrap an adult cuff around a pipe and connect the cuff to the module. Highlight Start test and give
the ComWheel a push. The test ends automatically or when Stop test (appears in place of Start
test) is pushed.

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Max. press indicates the pressure at which the safety valve opens and is normally 300 ±15 mmHg
for adult and 150 mmHg ±15 mmHg for infant. 2 s after stop indicates the pressure at 2 seconds
after the pump has stopped and is normally > 270 mmHg for adult and > 130 mmHg for infant. If
the value is less, check leakage by the active leak test.

5.1.5 NIBP pulse valve menu

Start Test Start test is for starting and Stop test is for stopping the test.
Set Valve Set Valve lets you adjust the opening of the pulse valve.

Pulse Valve Data

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.

Pulse Valve Checking

Wrap an adult cuff around a pipe and connect the cuff to the module. Select the Start test and
push the ComWheel. The pressure rises beyond 240 mmHg and stops. The pulse valve opens. The
module counts the time it takes for the pressure to go down from 240 mmHg to 50 mmHg and
displays it on the screen. The test can be manually stopped by selecting Stop test.
The valve can be adjusted between 0 and 255 (0 for fully closed and 255 for fully open). First select
Set Valve and push the ComWheel. See the pulse valve value and adjust it by turning the
ComWheel. Then push the ComWheel to confirm the value.
The ‘Interval 240 mmHg -> 50 mmHg’ time should be less than 60 seconds when the valve is
‘150’ and less than 10 when fully opened (255). When fully closed (0), the system should be
airtight and the pressure does not drop. Depending on an individual, the pulse valve may remain
closed up to approx. value 100.
If the measured time deviates much from those above, then the pulse valve or its tubes are faulty.

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5.1.6 NIBP buttons/leds menu

The selections Auto ON/OFF, Manual ON/OFF, STAT ON/OFF, and Measur. ON/OFF have no
effect on the module.

Buttons/Leds Data
See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Buttons Checking
The front panel keys function is confirmed by pressing and releasing the key and observing OFF
turns to ON at Auto On/Off, and Start Cancel.

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5.1.7 NIBP pneumatics menu

Start Pump/Stop Pump

A manual control for the pump. The selection changes to Stop Pump when the pump turns on.
Open Exh1/Close Exh1
No effect on the module.
Open Exh2/Close Exh2
A manual control for the exhaust valve 2. The selection changes to Close Exh2 when the valve is
opened.
Open Zero valve
No effect on the module.
Set Valve With Set Valve, the opening of the pulse valve is adjusted between 0 and 255 (0 for fully closed
and 255 for fully open). First push the ComWheel, then turn it to adjust the value on screen and
finally push to set the value.
Reset Clock Reset Clock will zero the time on the display.

Pneumatics Data field

See NIBP service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Pump, Exh1 Valve, and Exh2 Valve show their states. Note that Exh1 Valve has no effect to the
module.
Pulse Valve shows how much the valve is opened (0 to 255) during Valve Setting.
Interval 20 mmHg -> 185 mmHg Checking
Select the Start pump at different combinations of the valves open/closed and push the
ComWheel. The module counts the time it takes for the pressure to go up from 20 mmHg to 185
mmHg and displays it. When all the valves are closed, the pump should be able to pump the
pressure in about 1 to 4 seconds into an adult cuff wrapped around a pipe. The pump does not
stop without selecting the Stop Pump by pushing the ComWheel.

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5.1.8 NIBP watchdog menu

Test ADULT No effect on the module.

Test INFANT No effect on the module.
Stop Test No effect on the module.

Watchdog Data field

See NIBP Service menu in chapter 5.1 for information on general items Pressure, Zero, Protect
handle, Calibr. prot., +15 V power, AD0 to AD7 as well as Timeouts etc.
Watchdog Interval no effect on the module.
Adult watchdog time testing
No effect on the module.
Infant watchdog time testing
No effect on the module.

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5.1.9 ECG service menu

Power freq Set power frequency; 50 Hz/60 Hz.

Filter low Set filter low frequency; 0.05 Hz/0.5 Hz.
Filter high Set filter high frequency; 30 Hz (40 Hz if power freq is 60 Hz) /100 Hz or 150 Hz @ NE12STPR.

Service Data field

Power freq, and Cable type show the values chosen or detected, Filter low and high defines the
selected filter (Monitor/Diagnostic/ST).

Quick zero at PRESTN module is ON when the ECG signal is beyond scale, and therefore, is quickly
returned to optimal range using fast signal processing methods. All the Quick zero bits are ON at
the same time.

Cable shows ON when ECG cable is connected.

Electrode shows ON when each of these electrodes are connected.

Pacer count is a running number for pacemaker users.

Button No effect on the module.

Resp Available indicates that ECG hardware is capable of measuring impedance respiration.
Measurement shows ON when the respiration measurement is on.
Amp zero shows ON when zeroing of the respiration amplifier takes place.
Waveform VALUE will be updated in one second interval.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the module
has detected.
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The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software has
calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.1.10 ECG setup menu

Filter Filters the ECG signal high frequency noise and slow respiratory artefacts.
Monit (monitor) filter is used in routine monitoring. It effectively filters the artefacts caused by the
electrosurgery unit and respiration.
Diagn (diagnostic) filter is used if more accurate information of the waveform is needed (e.g., of P-
wave or AV block). The diagnostic filter is more susceptible to both high frequencies and baseline
wander than monitor filter.
STfilt (ST filter) permits more accurate information of ST segment. It filters the high frequency
artefacts caused by electrosurgery unit but catches the slow changes in ST segment. The ST filter is
more susceptible to baseline wander than the monitor filter.
Pacemaker Selects how to display the pacing pulse of cardiac pacemaker. The selections are Show, Hide, ON
R and Sensit.
Hide, the pacing pulse is filtered away from ECG data.
Show, the pacer pulse is filtered away from ECG data but the pulse is displayed as a constant
height marker.
ON R, pacing pulses are not filtered away from ECG data. This improves ECG monitoring with A-V
pacemaker patients, as QRS complexes are counted even if the pacing pulse hits the QRS complex.
However, during asystole the monitor may count pacing pulses as heart beats.
Sensit selection uses a more sensitive pacemaker detection. Pacemaker spike is displayed on
ECG.

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5.2 STP service menu

Record Data Record Data prints out the shown service data and board information (id, serial number and sw id)
onto the recorder module, M-REC.
Temp Test Temp Test activates the automatic temperature test for the temperature channels T1 and T2. The
result from the test is shown in the service data field.
NOTE: The Temp Test needs to be selected twice before the test starts.

Service Data field

Gain is a coefficient to compensate gain error. Usually the values for P1 and P2 are between
17000 and 25000 and for T1 and T2 between 13000 and 14300. Zero indicates offset
compensation value of each parameter in A/D converter. Typically the values for P1 and P2 are
within ±1000 and for T1 and T2 between -150 and +300. Calibrate if zero and/or gain value is
outside the ranges.

Cable shows ON when a corresponding cable is connected to the front panel and Probe shows ON
when a corresponding probe is connected to the cable.

Under Value the measured numeric values are displayed simultaneously. Pressure values are real
time values and shown in mmHg. Temperature values are shown in degrees Celsius.
The front panel STP keys functions are confirmed by pressing each key and observing OFF turns to
ON at Button.
SpO2 shows measured beat-to-beat SpO2 value. Modpr is a modulation % that indicates AC/DC
ratio in the measured signal. Hr is a pulse rate calculated from every beat.

Cable and Probe can be either OFF or ON, and these indicate the state PROBE OFF.
Under them there is a message field for SpO2. It can be OK, PULSE SEARCH, NO PROBE, PROBE
OFF, NO PULSE, ARTEFACT, POOR SIGNAL, or CHECK PROBE.
Balance between leds is adjusted by changing the intensity of red/infrared. Intensity of infrared
(Ired int.) is in the range of 40 to 255 and red intensity (red int.)is in the range of 40 to 255.
DC gain shows the gain of DC signal adjusted by the module.
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IDC is the value of infrared signal.

RDC is the dc value of red signal.
AC gain is the gain of infrared and red ac signals. AC gain values can be 1 or 0. Value 1 means high
ac gain and 0 means low gain.
Pre gain is a preamplifier gain for infrared and red signals. Pre gain values can be 1 or 0. Value 1
means normal operation. Value 0 means that signal levels are very low and extra gain is taken into
use.
Temp error shows the status of the temperature test. No errors found show the status (OFF) and
errors found (ON).

Protect key shows normally OFF but turns to ON when the button at the bottom of the module is
pressed.

Protect mode is normally ON. It turns to OFF when Protect is switched to OFF for the temperature
calibration in Calibration Menu.
Configuration shows the chosen module configuration: TP, ST, or STP.

Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times
communication from the module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the module
has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting (more than 5 per second) indicates
either serial communication failure, or module not in place. Also other modules can cause
communication errors that cause these numbers rise.
RAM indicates the state of the RAM memory.
ROM indicates whether the checksum at the EPROM is in accordance with the one the software has
calculated.
EEPROM indicates if the values stored in the permanent memory are valid.
The state is either OK, Fail or ? (module not in place or a communication error).

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5.2.2 STP calibration menu

Protection Protection for the configuration and temperature calibrations can be set ON and OFF .
Set Config The module configuration should be set according to the module type. The setting is possible only
when the protection is set OFF. The available selections are TP, ST or STP. The configuration setting
should be checked if the STP board is replaced.
Calibrate T1 / Calibrate T2
The functions are for calibrating the temperature channels T1 and T2. The calibrations are possible
only when the protection is set OFF. The temperature calibration requires accurate test plugs of
value 25 °C and 45 °C.
Calibration:
1. Select Calibrate T1/Calibrate T2
2. Insert the test plug 25 °C into the T1/T2 connector
3. Press the ComWheel
4. Insert the test plug 45 °C into the T1/T2 connector
5. Press the ComWheel
Calibrate P1/Calibrate P2
The functions are for calibrating the invasive blood pressure channels P1 and P2. The calibrations
require a pressure transducer (with an appropriate cable) and a pressure manometer.
1. Connect the pressure transducer with the pressure manometer to the P1/P2 connector.
Select Calibrate P1/Calibrate P2. Leave the transducer to room air pressure.
2. Press the ComWheel to start zeroing.
3. Supply a pressure of 100 mmHg to 300 mmHg to the transducer. The recommended
pressure is 200 mmHg.
4. Set the pressure on the display to match the pressure reading on the manometer and press
the ComWheel.

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6 SPARE PARTS

6.1 Spare parts list

6.1.1 M-PRESTN rev. 01, M-RESTN rev. 01, M-PRETN rev. 01

Figure 20 Exploded view of M-PRESTN Module

Item Description Order No. Replaced by

1 Module box (wide) 886168
2 Spring pin 879182
3 Latch for module box 879181
4 ECG_120 board M1008909
5 ECG Input board holder M1021216
6 STP_120 board M1006153
7 NIBP unit M1012677
8 Air filter (NIBP) 57142
9 Silicon tube NIBP (2pcs, 100mm) 73375
10 Membrane keypad 8005215
11 Mask including NIBP flex board and ECG connector unit M1018978
12 NIBP Cuff connector 64654

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Item Description Order No. Replaced by

13 NIBP Mounting nut 8004036
14 TEMPERATURE input board 8005216
15 Screw; pan-head, TORX PT 3x10mm (7 pcs) 628728
16 PRESS / SpO2 input board, M-PRESTN 8005219
16 PRESS input board, M-PRETN 8005492
16 SpO2 input board, M-RESTN 8005490
17 Screw; Cross head recess PT 2.5x10 (6kpl) M1021234
18 Fitting plate (only M-RESTN, M-PRETN) 879510
19 STP cable (34 contacts, female) M1001763
20 Cable holder M1008749
21 Board holder M1021283
22 Module bus cable 8004009
23 Cable tie 64001
24 Screw; cross head recess M3x8 black (2 pcs) 616215
25 Screw; cross head cylinder M3x6 ( 6 pcs) 61721
26 Front panel, DA, M-PRESTN M1021293
26 Front panel, DE, M-PRESTN M1021294
26 Front panel, EN, M-PRESTN M1021440
26 Front panel, ES, M-PRESTN M1021295
26 Front panel, FI, M-PRESTN M1021296
26 Front panel, FR, M-PRESTN M1021297
26 Front panel, IT, M-PRESTN M1021298
26 Front panel, JA, M-PRESTN M1021299
26 Front panel, NL, M-PRESTN M1021300
26 Front panel, NO, M-PRESTN M1021301
26 Front panel, PL, M-PRESTN M1021302
26 Front panel, PT, M-PRESTN M1021303
26 Front panel, SV, M-PRESTN M1021305
26 Front panel, DA, M-PRETN M1021423
26 Front panel, DE, M-PRETN M1021424
26 Front panel, EN, M-PRETN M1021422
26 Front panel, ES, M-PRETN M1021425
26 Front panel, FI, M-PRETN M1021426
26 Front panel, FR, M-PRETN M1021427
26 Front panel, IT, M-PRETN M1021428
26 Front panel, JA, M-PRETN M1021429
26 Front panel, NL, M-PRETN M1021430
26 Front panel, NO, M-PRETN M1021431
26 Front panel, PL, M-PRETN M1021432
26 Front panel, PT, M-PRETN M1021433
26 Front panel, SV, M-PRETN M1021434
26 Front panel, DA, M-RESTN M1021441
26 Front panel, DE, M-RESTN M1021443
26 Front panel, EN, M-RESTN M1021440
26 Front panel, ES, M-RESTN M1021444
26 Front panel, FI, M-RESTN M1021445
26 Front panel, FR, M-RESTN M1021446
26 Front panel, IT, M-RESTN M1021447
26 Front panel, JA, M-RESTN M1021448
26 Front panel, NL, M-RESTN M1021449
26 Front panel, NO, M-RESTN M1041450

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Item Description Order No. Replaced by

26 Front panel, PL, M-RESTN M1021451
26 Front panel, PT, M-RESTN M1021452
26 Front panel, SV, M-RESTN M1021453

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7 EARLIER REVISIONS
No earlier revisions.

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For your notes:

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APPENDIX A

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SERVICE CHECK FORM

DATEX-OHMEDA M-PRESTN, M-RESTN, M-PRETN MODULES

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

3. NIBP pump filter 4. Installation

5. Recognition

Notes

ECG measurement S/N

6. Module software (serial numbers)
ECG/RESP
STP
NIBP
OK N.A. Fail OK N.A. Fail
7. Communication and 8. Power frequency
memories
9. Cable recognition 10. Lead detection

11. Test with patient

simulator
Notes

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RESP measurement S/N

OK N.A. Fail OK N.A. Fail
12. RESP measurement 13. Test with patient
recognition simulator
Notes

TEMP measurement S/N

OK N.A. Fail OK N.A. Fail
14. Communication and 15. Temperature probe
memories detection
16. Calibration check 17. Temp test -function

18. Configuration
STP/ST/TP
Notes

InvBP measurement S/N

OK N.A. Fail OK N.A. Fail
19. Membrane keys 20. Cable and transducer
detection
21. Calibration 22. Test with patient
simulator
Notes

SpO2 measurement S/N

OK N.A. Fail OK N.A. Fail
23. SpO2 probe detection 24. Test measurement

Notes

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NIBP measurement S/N

OK N.A. Fail OK N.A. Fail
25. Communication and 26. Membrane keys
memories
27. Pump and valves

28. Leak test 28. ≤ 6 mmHg/min

29. Calibration check Measured B1 Measured B2 Allowed range
0 mmHg ± 9 mmHg
100 mmHg 100 ± 2 mmHg
200 mmHg 200 ± 3 mmHg
260 mmHg 260 ± 4 mmHg
30. Safety valve functions
B1 B2 Allowed range
‘Max press’ ADULT 270 to 330 mmHg
‘2 s after stop’ ADULT 270 to 330 mmHg
‘Max press’ INFANT 130 to 165 mmHg
‘2 s after stop’ INFANT 130 to 165 mmHg
OK N.A. Fail OK N.A. Fail
31. Cuff related 32. Adult cuff detection
messages
33. Test measurement 34. Infant cuff detection

Notes

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All modules
OK N.A. Fail OK N.A. Fail
35. Electrical safety 36. Functioning after
check electrical safety check
37. Final cleaning

Notes

Notes

Used Spare Parts

Signature

A- 4(4)
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 Datex-Ohmeda
S/5TM Airway Module, G-AO (rev. 06)
S/5TM Airway Module, G-AiO (rev. 05)
S/5TM Airway Module, G-AiOV (rev. 04)
S/5TM Airway Module, G-AOV (rev. 04)
S/5TM Gas Interface Board, B-GAS (rev. 01)

Technical Reference Manual Slot

All specifications are subject to change without notice.

Document No. 8001005-5

September 2003

Datex-Ohmeda, Inc. Datex-Ohmeda Division, Instrumentarium Corp.

P.O. Box 900, FIN-00031
P.O. Box 7550, Madison
DATEX-OHMEDA, FINLAND
WI 53707-7550, USA
Tel. +358 10 394 11 Fax +358 9 146 3310
Tel. 1-608-221-1551 Fax 1-608-222-9147
www.datex-ohmeda.com
www.us.datex-ohmeda.com  Instrumentarium Corp. All rights reserved.
mailto:product.support.ussub@us.datex-ohmeda.com
 Table of contents

TABLE OF CONTENTS
S/5 Airway modules and S/5 Gas Interface Board, B-GAS
TABLE OF CONTENTS i
TABLE OF FIGURES iii
INTRODUCTION 1
1 Specifications 2
1.1 General specifications ..........................................................................................................................2
1.2 Typical performance .............................................................................................................................2
1.2.1 CO2 .............................................................................................................................................2
1.2.2 Respiration rate............................................................................................................................2
1.2.3 O2................................................................................................................................................2
1.2.4 N2O .............................................................................................................................................2
1.2.5 Hal, Iso, Enf .................................................................................................................................2
1.2.6 Sev..............................................................................................................................................2
1.2.7 Des .............................................................................................................................................3
1.2.8 Agent identification ......................................................................................................................3
1.2.9 Patient Spirometry........................................................................................................................3
1.2.10 Airway Pressure (Paw) ..............................................................................................................3
1.2.11 Tidal Volume (TV)......................................................................................................................3
1.2.12 Minute Volume (MV).................................................................................................................3
1.2.13 Airway flow ..............................................................................................................................3
1.3 Technical specification .........................................................................................................................4
1.3.1 CO2 .............................................................................................................................................4
1.3.2 O2................................................................................................................................................4
1.3.3 N2O .............................................................................................................................................4
1.3.4 AA ...............................................................................................................................................4
2 Functional Description 5
2.1 Measurement principle .........................................................................................................................5
2.1.1 CO2, N2O and Agent measurement ................................................................................................5
2.1.2 O2 measurement ..........................................................................................................................6
2.1.3 Agent identification ......................................................................................................................7
2.1.4 Patient Spirometry........................................................................................................................8
2.2 Main components.................................................................................................................................9
2.2.1 Gas sampling system .................................................................................................................10
2.2.2 ACX-200 measuring unit.............................................................................................................16
2.2.3 OM measuring unit .....................................................................................................................18
2.2.4 ACX measuring board .................................................................................................................18
2.2.5 ASX agent identification bench ...................................................................................................20
2.2.6 ASX measuring board .................................................................................................................20
2.2.7 PVX board ..................................................................................................................................22
2.2.8 Gas mother board ......................................................................................................................24
2.2.9 Gas interface board....................................................................................................................26
2.3 Connectors and signals.......................................................................................................................26
2.3.1 Module bus connector................................................................................................................26

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2.3.2 Gas mother board connectors.....................................................................................................27

3 Service Procedures 31
3.1 General service information ................................................................................................................31
3.2 Service check.....................................................................................................................................32
3.2.1 Recommended tools..................................................................................................................32
3.2.2 Recommended parts..................................................................................................................32
3.3 Disassembly and reassembly .............................................................................................................41
3.4 Adjustments and calibrations .............................................................................................................42
3.4.1 Gas sampling system adjustment ...............................................................................................42
3.4.2 Flow rate measurement..............................................................................................................42
3.4.3 Oxygen measurement unit adjustments.......................................................................................44
3.4.4 Flow calibration .........................................................................................................................46
4 Troubleshooting 47
4.1 Troubleshooting chart.........................................................................................................................47
4.1.1 Supply voltage troubleshooting...................................................................................................48
4.2 Gas sampling system troubleshooting .................................................................................................49
4.2.1 Sampling system leak test..........................................................................................................49
4.2.2 Water separation .......................................................................................................................49
4.2.3 Steam test for the special tubes..................................................................................................49
4.3 OM measuring unit troubleshooting.....................................................................................................50
4.4 ACX troubleshooting ...........................................................................................................................50
4.4.1 Cleaning the measuring chamber of ACX measuring unit ..............................................................50
4.5 ASX agent identification unit troubleshooting.......................................................................................52
4.6 PVX board troubleshooting..................................................................................................................53
4.6.1 Spirometry tubing leak test.........................................................................................................53
4.7 Gas mother board troubleshooting ......................................................................................................54
4.7.1 Instructions after replacing the software or Gas mother board.......................................................54
4.8 Error messages ..................................................................................................................................55
5 Service menu 56
5.1 Gas mother board ..............................................................................................................................57
5.2 ACX service menu...............................................................................................................................60
5.3 PVX service menu ...............................................................................................................................62
5.3.1 Flow calibration .........................................................................................................................63
5.3.2 Temp & Hum service menu.........................................................................................................64
5.4 ASX service menu...............................................................................................................................65
6 Spare parts 66
6.1 Spare parts list...................................................................................................................................66
6.1.1 G-AO rev. 01..05, G-AiO rev. 00…05, G-AOV rev. 00…04, G-AiOV rev. 00…04, G-O rev. 00…01...66
6.1.2 Planned Maintenance (PM) Kits: .................................................................................................69
6.1.3 Gas Interface Board, B-GAS .......................................................................................................69
7 Earlier Revisions 71
APPENDIX A 73
Service check FORM A-1

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 Table of contents

TABLE OF FIGURES
Figure 1 CO2/N2O/AA gas absorption spectra.....................................................................................................5
Figure 2 O2 measurement principle ....................................................................................................................6
Figure 3 Anaesthetic Agents gas absorption spectra............................................................................................7
Figure 4 Airway module block diagram ...............................................................................................................9
Figure 5 Gas sampling system block diagram ...................................................................................................12
Figure 6 Gas sampling system layout................................................................................................................13
Figure 7 Gas sampling system block diagram ...................................................................................................13
Figure 8 Gas sampling system layout................................................................................................................14
Figure 9 ACX photometer (ACX-200 measuring unit)..........................................................................................16
Figure 10 CO2/N2O/AA measurement block diagram......................................................................................17
Figure 11 ACX measuring board block diagram ...............................................................................................19
Figure 12 ASX measuring unit ........................................................................................................................20
Figure 13 ASX measuring board block diagram ...............................................................................................21
Figure 14 PVX board block diagram ................................................................................................................23
Figure 15 Gas mother board block diagram ....................................................................................................25
Figure 16 Gas sampling system adjustment chart ...........................................................................................43
Figure 17 O2 measuring unit adjustments .......................................................................................................46
Figure 18 ASX troubleshooting flowchart.........................................................................................................52
Figure 19 PVX board troubleshooting flowchart ...............................................................................................53
Figure 20 Exploded view of Airway Module......................................................................................................66

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 S/5 Airway modules

INTRODUCTION
The S/5 Airway Modules, G-AO, G-AiO, G-AOV and G-AiOV are designed for use with the S/5
Anesthesia Monitor and provide airway and respiratory parameters. Later in this manual modules
can be called w/o system name S/5.
This Technical Reference Manual Slot provides information for the maintenance and service of the
airway modules. Please see also the Technical Reference Manual for information regarding to
system e.g. related documentation, conventions used, symbols on equipment, safety precautions,
system description, system installation, interfacing, functional check and planned maintenance.

Letters in the name stand for:

G = Side mountable gas module
O = CO2, Patient O2, and N2O
V = Patient Spirometry
A = Anesthetic agents
i = Agent identification

Table 1 Options of Parameter Modules

CO2 N2O Patient O2 Agents Agent id Spirometry

G-AO • • • •
G-AiO • • • • •
G-AOV • • • • •
G-AiOV • • • • • •

NOTE: The Airway Modules and Compact Airway Modules cannot be used simultaneously in the
same monitor.
Gas Interface Board
Gas Interface Board, B-GAS is used for connecting the airway module to the central unit. The
connection can also be made through the Interface Board, B-INT.

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1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 135 × 410 × 135 mm/5.3 × 15.0 × 5.3 in
Module weight 6 kg/13 lbs.

1.2 Typical performance

Sampling rate 200 ml/min nominal (180...220 ml/min)
Display update rate breath-by-breath
Automatic compensation for pressure, CO2-N2O, and CO2-O2 collision broadening effect.
Warm-up time 3 min for operation, 30 min for full specifications.
Auto-zeroing is performed at start-up, after 5 min + 5 min + 5 min + 15 min + 15 min + 15 min,
and after that every 60 min at regular intervals.

1.2.1 CO2
Measurement range 0 to 10 %, (0 to 10 kPa), (0 to 76 mmHg)
Extended range 10 to 15 %, (10 to 15 kPa), (76 to 114 mmHg) (unspecified)
If CO2 concentration is below 0.1 %, 0.0 % is displayed.

1.2.2 Respiration rate

Breath detection 1 % change in CO2 level
Measurement range 4 to 60 breaths/min

1.2.3 O2
Measurement range 0 to 100 % O2

1.2.4 N2O
Measurement range 0 to 100 % N2O

1.2.5 Hal, Iso, Enf

Measurement range 0 to 5 %
Extended range 5 to 15 % (unspecified)

1.2.6 Sev
Measurement range 0 to 8 %
Extended range 8 to 15 % (unspecified)

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1.2.7 Des
Measurement range 0 to 18 %
Extended range 18 to 30 % (unspecified)
Resolution two decimals when the AA concentration below 1.0 %
If AA concentration is below 0.10 %, 0.00 % is displayed.

1.2.8 Agent identification

Identified agents HAL, ENF, ISO, SEV, DES
Identification time 30 seconds (typical value with pure agents)
Identification threshold 0.15 vol% (typical)
Mixture warning when minor component concentration > 0.3 vol% and > 15 %of total agent
concentration

1.2.9 Patient Spirometry

Values are valid when:
Respiratory rate adult 4...30 pedi 4...50 breaths/min
I:E ratio 1:3 - 1:0.5
Inner diameter of ET tube is ≥ 5.5 mm (adult) or 3 to 6 mm (pediatric).

1.2.10 Airway Pressure (Paw)

Accuracy ±1.5 cmH2O
Resolution 1 cmH2O
Measuring range -20 to +80 cmH2O

1.2.11 Tidal Volume (TV)

Accuracy ±6 % or 30 ml (adult); ±6 % or 4 ml (ped)
Resolution 1 ml
Measurement range 150 to 2000 ml (adult)
15 to 300 ml (pediatric)

1.2.12 Minute Volume (MV)

Resolution 0.1 l/min
Measurement range 2 to 15 l/min (adult)
0.5 to 5 l/min (pediatric)

1.2.13 Airway flow

Measurement range 1.5 to 100 l/min for both directions (adult)
0.25 to 25 l/min for both directions (pediatric)

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1.3 Technical specification

1.3.1 CO2
Measurement rise time <360 ms (from 10 to 90 %)
Gain stability ≤0.2 %CO2/24 h (0 to 8 %)
≤0.4 %CO2/24 h (8 to 10 %)
Gain temperature drift ≤0.2 %CO2/10 °C (0 to 8 %)
≤0.4 %CO2/10 °C (8 to 10 %)
Nonlinearity error ≤0.2 %CO2 (0 to 8 %)
≤0.4 %CO2 (8 to 10 %)

1.3.2 O2
Measurement rise time <480 ms (from 10 to 90 %)
Gain drift ≤2 % O2/24 h
Gain temperature drift ≤3 % O2/10 °C
Nonlinearity error ≤2 % O2

1.3.3 N2O
Measurement rise time <360 ms (from 10 to 90 %)
Gain drift ≤2 % N2O/24 h
Gain temperature drift ≤3 % N2O/10 °C
Nonlinearity error ≤2 % N2O

1.3.4 AA
Measurement rise time <520 ms (from 10 to 90 %)
Gain drift ≤0.4 % AA/24 h
Gain temperature drift ≤0.4 % AA/10 °C
Nonlinearity error ≤0.2 % AA
Protection against electrical shock
Type BF

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2, N2O and Agent measurement

The CO2, N2O, and anesthetic agent the gas measurements are based on absorption of infrared
light as it passes through the gas sample in measuring chamber of the photometer. The light
absorption is measured at three wavelengths using an infrared detector. One of the wavelengths is
that of the CO2 absorption peak at 4.3 micrometers, the second is that of the N2O absorption peak
at 3.9 micrometers, and the third is that of the anesthetic agent absorption peak at 3.3
micrometers. The signal processing electronics receive the signals from the IR detector and
demodulate it to get DC components out of these signals which correspond to the content of each
gas in the sample.

Figure 1 CO2/N2O/AA gas absorption spectra

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2.1.2 O2 measurement
The differential oxygen measuring unit uses the paramagnetic principle in a pneumatic bridge
configuration. The signal picked up with a differential pressure transducer is generated in a
measuring cell with a strong magnetic field that is switched on and off at a frequency of 110 Hz.
The output signal is a DC voltage proportional to the O2 concentration difference between the two
gases to be measured.

Electromagnet
Mixture
out

Switched
magnetic
Microphone field

Sample in

Reference in

Figure 2 O2 measurement principle

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2.1.3 Agent identification

The anesthetic agent identification bench identifies Halothane, Enflurane, Isoflurane, Desflurane
and Sevoflurane.
The bench measures the spectrum of the gas between 3.24 µm and 3.39 µm. Because the
spectrum of each of the anaesthetic agents is different it is possible to identify them.
The bench consists of an infrared source, a measuring chamber, a rotating filter and a detector. The
peak wavelength of the narrow bandpass filter changes when the angle between the light path and
the filter is changed. When the filter rotates the required spectrum is scanned through. The agent or
a mixture of agents is identified by comparing the measured spectrum with stored reference
spectra.

Anesthetic Agent Gas Absorption Spectra

500
450
400
Halothane 0
350
Enflurane 0
300
Isoflurane 0
250
Sevoflurane 0
200
Desflurane 0
150
Freon 0
100
50
0
3246

3306

3386

Wavelength [nm]

Figure 3 Anaesthetic Agents gas absorption spectra

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2.1.4 Patient Spirometry

In anesthesia, CMV (Controlled Mechanical Ventilation) is the mostly used ventilation mode. In this
mode, mechanical breaths are delivered to the patient by a ventilator with a proper tidal volume
(TV), respiration rate (RR), and inspiration/expiration ratio in time (I:E) determined by the settings of
the ventilator.
Delivery of life support gases is based on pressure. However, without knowing the measured
volume of exhalation, one cannot be sure that a breath occurred. The ultimate goal of ventilation is
to use the least amount of pressure to generate the most appropriate volume for each breath.
Patient Spirometry monitors ventilation in anesthesia. Both patient breathing circuit and the
function of the ventilator are monitored. The following parameters are displayed:
Expiratory and inspiratory tidal volume (TV) in ml.
Expiratory and inspiratory minute volume (MV) in l/min.
Expiratory volume in first second (V1.0) in per cent for adults and in 0.5 seconds for children.
Inspiration/expiration ratio in time (I:E)
Airway pressures: Peak pressure (Ppeak), End inspiratory pressure (Pplat), Positive end expiratory
pressure (PEEP), Real time airway pressure waveform (Paw)
Flow: Real time flow waveform (V')
Compliance (C)
Pressure volume loop
Flow volume loop

Airway pressure
PEEP, Ppeak, and Pplat are measured by pressure transducer on the PVX board. Atmospheric pressure
is used as a reference in measurement. The pressure measurement is made from the airway part
that is closest to the patient between patient circuit and intubation tube.

Airway flow
The measurement is based on measuring the kinetic gas pressure and is performed using the Pitot
effect. A pressure transducer is used to measure the Pitot pressure. The obtained pressure signal is
linearized and corrected according to the density of the gas. Speed of the flow is calculated from
these pressure values and TV value is then integrated. MV value is further calculated and averaged
using TV and RR (respiratory rate) values.

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Patient Spirometry sensor, D-lite

Patient Spirometry is measured with a specific sensor,D-Lite+/ D-lite or Pedi-Lite+/ Pedi-lite.
D-lite and Pedi-lite sensors are designed to measure kinetic pressure by two-sided Pitot tube. The
pressure reduction caused by measuring cross is taken into account, too, especially in small flows.
Velocity is calculated from pressure difference according to Bernoulli's equation. Flow is then
determined using the calculated velocity.
2 × dP
v= (from Bernoulli's equation)
ρ
F = v×A ,
where,
F=flow (l/min)
v=velocity (m/s)
A=cross area (m2)
dP=pressure difference (cmH2O)
ρ=density (kg/m3)
Finally the volume information is obtained by integrating the flow signal.

2.2 Main components

The airway modules consist of ACX-200 and OM-101 gas measuring units, ASX-200 agent
identification unit (G-AiO/AiOV), PVX board (G-OV/AiOV/AOV), gas sampling system, ACX
measuring board and gas mother board.
Lamp
ACX Signal outACX Supply ASX PVX Gas pressure
Board Bench Voltage Unit Board and flow in
Supply
voltages,
Control
X1 X1

X2 X8 X9 X5 X3

X4 Supply Supply
Oxygen O2 ASX voltages PVX voltages
Measuing signal Supply ACX Valve Lamp X10
voltages serial controls Driver serial serial
Unit i/O i/O
Supply I/O +24/+32 VD Fan
voltages
ACX, ASX,
PVX serial +5 VL Lamp
I/O GND control X12
GNDD
Valve controls Valve +15 VD Valves
+5 V, GND Lamp Driver
+15 VD, GNDD
control
X1 Gas Module CPU Pump control
Serial I/O Serial I/O Mod key in X7
Pump control Pump +15 VD Pump
Driver
+5 Vref +15 VD, GNDD

+5 V
+5 VL +15 V Regulator X11
+15 VD GND Module
+/-15 V Key
+24 /+32 VD Mod key in
GND
GNDD Gas Mother Board

Figure 4 Airway module block diagram

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2.2.1 Gas sampling system

The gas sampling system samples the gas arriving at the module, and removes water and
impurities from it. A sampling line is connected to the water trap on the front panel. The pump
draws gas through the sampling line to gas measuring units. After the measurements, the gas is
exhausted from the sample gas out connector on the rear panel of the module.

Water trap, D-fend

The gas sample enters the monitor through the water trap, where it is divided into two flows, main
flow and side flow (see Gas sampling system block diagram). The main flow goes into the
measuring system through a hydrophobic filter.
The side flow creates a slight sub-atmospheric pressure within the water trap container. This
facilitates gathering the fluid removed by the hydrophobic filter.

Sampling line

The sampling line is an integral part of the total sampling system. The resistance established by the
sampling line is significant when the software determines the occlusion and air-leak alarm limits
during the turn-on sequence.
The small inner diameter causes fluids such as blood or mucus not to propagate within the tube, so
that when the line is clogged, it is replaced.

The NafionTM tube 1)

A nafion tube (tubes A or B, and C: see figure 5) is used to balance the sample gas humidity with
that of ambient air. The tube will prevent errors caused by the effect of water vapor on gas partial
pressure when humid gases are measured after calibration with dry gases. It is inserted between
the water trap and the zero valve (G-AiO/AiOV) or between the zero valve and ACX-200 measuring
unit (G-O/OV/AO/AOV). The tube is also inserted between the CO2 absorber and the zero valve.

Zero valve

The main flow passes through a solenoid valve before proceeding to the ACX-200 measuring unit.
This valve is activated to establish the zero points for the ACX-200 and O2 measuring units at start-
up, at 5 minutes, and after that at regular intervals. After 1-hour of monitoring, the auto-zeroing is
performed once an hour. When the valve is activated, room air is drawn through the CO2 absorber
into the internal system and the gas sensors.

1)
Nafion is a trademark of Du Pont

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Gas measuring units, ACX-200 and O2 unit

After the zero valve, the gas passes through the ACX-200 and O2 measuring units. In the ACX-200
measuring unit, infrared light is passed through chambers containing the main flow gas
(measurement) and a chamber containing reference gas. The measurement is made by
determining the ratio between the two light intensities.
The oxygen sensor has two inputs. One input accepts the main flow and the other draws in room air
for reference. The sensor uses a differential pressure transducer to compare the pressure gradient
produced when both gases are exposed to an oscillating magnetic field. Both gas flows exit from a
single port.
In i model, the ASX agent identification unit is installed in parallel with the oxygen sensor. The task
of the ASX unit is to identify anesthesia agents using the same infrared light method used in the
ACX-200 unit.

Pressure valve
The pressure valve is used to measure the pressure gradient between the O2 measurement flow
and the O2 reference flow. This pressure gradient reflects the condition of the D-fend water trap
filter.
Normally the pressure gradient between the O2 measurement flow and the reference flow is
approximately +8 mmHg. If the software detects the gradient to be between 0 and -5 mmHg, the
pressure valve will initiate pressure measurement of the reference flow. If the gradient is greater
than -5 mmHg, the software triggers the message ’Replace Trap’.

Flow cassettes
The internal flow rates are set using flow cassettes. These cassettes are used to set the side flow
rate and the O2 reference flow rate, the flow rates through the measuring units and the total flow
rate of the sampling system.

Sampling pump and damping chamber

The sampling pump is a vibrating membrane pump driven by a 50 Hz/12 V/0.4 A square wave
current.
The damping chamber is used to even out the pulsating flow and silence the exhaust flow.

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G-gas_sampl_sys_diag.vsd

Figure 5 Gas sampling system block diagram

In G-AO, -AOV models, tube A is Teflon, B and C Nafion. In G-AiO, -AiOV models, tubes A and C are
Nafion, B is Teflon.
See new tubing since autumn 1998 in figure 7.

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Figure 6 Gas sampling system layout

See new sampling system layout since autumn 1998 in figure 8.

Pressure valve Sample pump

Ref IN Filter Pressure
Room AIR transducer ASX-200
CO2 in G-AiO/AiOV
C Sample
absorber
Zero valve Gas OUT

main flow B ACX-200 O2 sensor

Sample
D-fend A Damping
Gas IN chamber
side flow
Constriction cassette

Figure 7 Gas sampling system block diagram

In G-AO, -AOV models, tube A is Teflon, B and C Nafion. In G-AiO, -AiOV models, tubes A and C are
Nafion, B is Teflon. Figure 7 is valid for modules manufactured since autumn 1998.

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Figure 8 Gas sampling system layout

Figure 8 is valid for modules manufactured since autumn 1998.

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Table 2 Flow cassettes

Flow Code
cassette
50/26.0 878048
50/19.0 873800
50/16.3 878047
50/15.3 873801
50/14.1 878046
50/13.1 873802
50/12.4 878045
50/11.2 874770
50/10.4 873803
50/9.2 874509
50/8.7 873804
50/7.4 873805
50/6.5 878044
50/5.8 873806
50/5.1 878043
50/4.4 873807
50/3.8 878042
50/3.2 873808
50/3.0 878040
50/2.8 878039
50/2.5 878038
50/2.3 873809
50/2.0 878037
50/1.8 873810
50/1.6 878036
50/1.4 873811
50/1.1 873812
NOTE: The number on the cassette represents relative flow when a specific pressure is applied.
Therefore 50/26.0 presents the least resistance and 50/1.1 the most.

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2.2.2 ACX-200 measuring unit

The ACX photometer is of dual path type. The infrared light beam passes through a measuring
chamber containing the gas to be analyzed, and a reference chamber, which is free of CO2, N2O,
and AA. The measurement is made by determining the ratio between the two light intensities.

Figure 9 ACX photometer (ACX-200 measuring unit)

A filter wheel is used to control the light from an incandescent lamp that passes through the
photometer. The filters are arranged so that the light is passed sequentially:
• first at the CO2 absorption wavelength through the reference chamber
• then through the measuring chamber
• finally it is blocked completely
The same sequence is repeated at the N2O and anesthetic agent gas absorption wavelengths.
After passing through the filters the light is reflected and focused by a mirror onto the infrared
detector. This detector measures the three light levels for each gas described above.
There is an optical sensor incorporated in the photometer which detects light from a reflective
surface on the filter wheel once every revolution. The pulses from this sensor are used to
synchronize the electronics to the signal from the infrared detector. A stabilizing diode measures
the temperature, which is needed to compensate for thermal drifts. The infrared detector, the
optical sensor and the stabilizing diode are mounted on the preamplifier board.

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Figure 10 CO2/N2O/AA measurement block diagram

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2.2.3 OM measuring unit

The oxygen measurement is based on the paramagnetic susceptibility, which is a unique property
of oxygen among all gases generally present in a breathing gas mixture. The gas to be measured
and the reference gas, which usually is room air, are conducted into a gap in an electromagnet with
a strong magnetic field switched on and off at a frequency of approximately 110 Hz.
An alternating differential pressure is generated between the sample and reference inputs due to
forces acting on the oxygen molecules in a magnetic field gradient.
The pressure is measured with a sensitive differential transducer, rectified with a synchronous
detector and amplified to produce a DC voltage proportional to the oxygen partial pressure
difference of the two gases.

2.2.4 ACX measuring board

The measuring electronics can be divided into a few functional blocks, which are described below
(see the block diagram in figure 11).
The ACX Measuring board controls gas measurements. It converts the photometer signal into digital
data, calculates results and transmits it to Gas mother board. The board contains, in addition to
the 80C51FA processor, EPROM, RAM, and EEPROM, several analog and digital I/O functions.

Internal and external bus

The processor has access to the Measuring board peripherals (memory, A/D converter, D/A
converters, etc) via an internal bus. For communication between the Gas mother board and the
Measuring board, there is an external bus in connector X1.

Memory
Memory components include 64k × 8 bit EPROM program memory, 32k × 8 bit low current CMOS
RAM, and EEPROM for permanent calibration values and setup memory.

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g-acx_measbrd_diag.vsd
Figure 11 ACX measuring board block diagram

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2.2.5 ASX agent identification bench

The ASX-200 agent identification bench has one measuring chamber. Background compensation
is done by subtracting the background spectrum from the measured signal. The background
spectrum is measured simultaneously with the zeroing of the ACX-200 unit. The resulting spectrum
is analyzed to identify the agent.
The ASX unit requires two calibrations. One is the time between synchronization pulse and
measured spectrum (time offset) of the ASX-200 and the other is the peak wavelength of the
narrow bandpass filter. The former is calibrated automatically together with the gas calibration of
the ACX and the latter is calibrated at the factory.

ASX Bo a r d

Preamplifier

ASX Unit

Figure 12 ASX measuring unit

ASX preamplifier board

The absorption of infrared light is measured with a lead selenide detector. The signal is amplified
and then sent to the measuring board.

2.2.6 ASX measuring board

The measuring electronics can be divided into a few functional blocks, which are described below
(See the block diagram in figure 13).
The ASX measuring board controls the measurement. It converts the ASX photometer signal to
digital data, calculates results and communicates with the main CPU through a serial channel. The
board contains, in addition to the 80C196 processor, EPROM, RAM, and EEPROM, several analog
and digital I/O functions.
Processor section
Processor is a 80C196 and works at 12 MHz. It has an internal A/D-converter with a multiplexer.
One channel is used for converting temperature signal. Two others are for the measurement signal
from preamplifier board.
The processor uses an internal bus to access EPROM (64k x 8 bit), SRAM (8k x 8 bit) and two D/A-
converters. It communicates with the Gas mother board through a serial channel (RXD, TXDB).

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EEPROM is a 64 x 16 bit serial chip. It is partly protected so that if jumper X1 is installed the
processor can erase or write the protected registers by serial communication commands. The
protected section contains permanent factory calibrations.

g-asx_meas_brd_diag.vsd

Figure 13 ASX measuring board block diagram

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2.2.7 PVX board

When Patient Spirometry is used, special sensors, D-Lite+ / D-lite or Pedi-Lite+ / Pedi-lite,
replaces the normal airway adapter in the patient circuit. The spirometry tubing is attached to the
two connectors on the sensor and on the module front panel.
NOTE: Overpressure or negative pressure of more than 300 cmH2O to the flow and volume tubing
should never be applied.
The board is intended to perform the following tasks
• Measure the pressures in airways and the speed of breathing flow.
• Calculate tidal volume, minute volume, compliance and other useful information on patient
lungs.

Pressure transducers
There are two pressure transducers on the PVX board for airway pressure measuring purposes.
The breathing flow of a patient passing through D-lite adapter creates pressure difference. This
pressure difference is measured by pressure transducer, B1. Overpressure and negative pressure
in airways are measured by another pressure transducer B2.
NOTE: Never apply DIFFERENTIAL pressure higher than 25 cmH2O to the spirometry tubing. Make
sure that both spirometry tubes are always connected.

Temperature compensation
Temperature is measured by B1. This signal is used only for temperature compensation of the
pressure transducer B1 on the PVX board.

Data processing
After the multiplexer, the signals, PRESS, FLOW0, FLOW1, and TEMP are A/D converted for data
processing.

External communication
Communication between the PVX board and the Gas mother board is established in serial form,
using the serial channel (pins 10 and 11) of CPU on the PVX board.

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 Press +
PRESS
Sense -
Gas Pressure

Figure 14
and Flow
IN (from Front Panel)
MUX D12

A/D Reset
Temp sense
Room Pressure TEMP Converter
Zero OUT
IN Valve

FLOW1
Room Pressure OUT D6
Zero Press D4
IN +
Valve Diff. FLOW0
+
Sense -
-
SRAM
Gas Pressure EEPROM
A8 CPU
and Flow EPROM

PVX board block diagram

BUS 8051FA
IN (from Front Panel)
OFFSET

Vol
MUX D12
Serial In
from/to Gas mother board

D/A
Flow Converter
D12

Serial Out

to Gas mother board

Pressure

g-pvx_brd_diag.vsd

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2.2.8 Gas mother board

The Gas mother board controls power supply to each measuring unit, as well as the serial
communication between the units and the module processor. There are connectors for the pump,
valves and gas measuring units on the board. The board contains a processor which controls the
functions within the module.
The tasks of the module processor are:
• to receive commands from the main CPU board and pass them on to Measuring boards.
• to gather measurement results from the Measuring boards, analyze them, and transmits
data to the main CPU board.
• to control the valves and pump based on the data which ACX Measuring board transmits.

Main parts
• Module processor 80C196KC/16 MHz
• 16 MHz oscillator
• EPROM program memory
• External RAM memory
• EEPROM
• Address and data bus latch
• Address decoding GAL-circuit
• 4-channel serial communication IC (QUART, D4)

External communication
Serial communication bus inside the module processor is used. The bus is connected to module
bus via RS-485 buffer. Transmit and reception controls of buffer are controlled by the processor.

Connections to measuring boards

Data collection from the measuring units takes place in serial communication bus. Serial
communication lines of the measuring units are connected to QUART IC on the Gas mother board;
Channel 1 - ACX, channel 2 - ASX, channels 3 - PVX, channel 4 - not in use). The transmit side of
QUART has a buffer IC and the receipt side has a pull-up resistor.

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Valves, pump and infrared lamps control

Valves are controlled by the ACX Measuring board from which the control signals are run through
buffer IC to the valve connector. OCCLUS signal controls the pressure (occlusion) valve and ZERO
signal controls the zero valve.
The control signal for the pump comes from the module processor. The signal is 50 Hz pulse-width
modulated square wave. The control command is received from ACX Measuring board in serial
communication.
The control command (LAMP) of the infrared lamps of the chambers comes from the module
processor.

Key push reading

CPU reads the front panel key pushes.

Reset
Voltage supervising circuit performs power-on reset. Reset from the module bus is connected via
RS-485 buffer.
X4: OM
SENSOR NRESET

X2: ACX X5: ASX X1: X3: PVX ANALOG: VOL.

UNIT SENSOR AUX I/O SENSOR AWFLOW, AWPRE

buffer buffer

SERIAL COMM. CHIP

EPROM
CPU MODULE BUS
SERIAL COMM.
RAM
RS-485 buffer

X11: MODULE
KEYBOARD

PUMPDRV PUMP DRIVER X7: PUMP

LAMPDRV LAMP DRIVER X9: ACX. X8: ASX

LAMPS

ZERO OCCLUS
VALVE DRIVERS X12: VALVES

CPURESN
supervisor

MODULE BUS
Voltage

RESET

RS-485 buffer NRESET

POWER RESET

Figure 15 Gas mother board block diagram

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2.2.9 Gas interface board

The Gas interface board, B-GAS is used for connecting an Airway Module to the Central Unit.
The board connects Airway Module signals to the module bus and supplies voltages from the
module bus to the Airway Module.
On the board there is a fuse (T4A) and some capacitors to regulate the power supply.

2.3 Connectors and signals

2.3.1 Module bus connector

13 1
25 14

Pin No I/O Signal

1 I RESET RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15VDC
5 I/O -DATA RS485
6 I/O DATA RS485
7 Ground and Shield
8 I -RESET RS485
9 n/c
10 n/c
11 n/c
12 n/c
13 Ground and Shield
14 I +24/+32 VDIRTY Depends on power supply
15 I Ground DIRTY
16 n/c
17 n/c
18 n/c
19 n/c
20 I GASFR (not used)
21 I CTSD (not used)
22 I TXDD (not used)
23 O RXDD (not used)
24 I +5 VDC
25 I +5 VDC DIRTY, for infrared lamps
For B-GAS CPU Mother Board connector, see CPU Bus Connector in the Central Unit Section.

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2.3.2 Gas mother board connectors

X1 Module connector. Serial communication bus to the main CPU
board. Supply voltages.
X2 ACX Measuring board
X3 PVX board
X4 Oxygen measuring unit
X5 ASX Measuring board
X7 Sampling pump
X8, X9 Power supply for infrared lamps (ACX, ASX)
X10 Fan
X11 Module front panel keys
X12 Valves

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ACX measuring board (X1) - Gas mother board (X2)

Pin No. a b c
1 +15 V NC AGND
2 -15 V NC +10 VREF
3 AOUT6 NC AOUT5 AA
4 AOUT4 VL NC AOUT3 CO2
5 AOUT2 O2 NC AOUT1 N2O
6 DAC1 FLOW NC DAC0 PRES
7 AIN7 SAL NC ADC6 VOUT R
8 ADC5 AWL NC ADC4 VOUT IR
9 ADC3 O2 NC ADC2
10 ADC1 AWP NC AIN4 SSIGN
11 NC AGND NC
12 NC AGND NC
13 NC LAMP NC
14 NC PB5 NC
15 NC SSYNC NC
16 RBD2 SMOTOR NC
17 -RESET -PC0 TO RTSO
18 SEROUT 0 NC SERIN 0
19 P1.1 PC2 FGAIN 1 P1.0
20 OP0 RTSA PC3 FGAIN 2 INT0
21 SEROUT 1 PC4 OCCLUS SERIN 1
22 OP1 RTSB PC5 PUMPON IP2 TIMERIN 0
23 SEROUT 2 PC6 ZERO SERIN 2
24 NC PC7 RTS0 NC
25 NC PA0 NC
26 NC PA1 NC
27 NC PA2 NC
28 INT1 PA3 INT3
29 +5 V DRV PA4 +5 V
30 +15 VDIRTY PA5 +5 V
31 +12 V PA6 21 VAC
32 GND DIRTY PA7 ALR CALL DGND
NC = not connected
AIN is an AD-converter and AOUT is a DA-converter in ACX board.
ADC is an AD-converter and DAC is a DA-converter in the Gas mother board.

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ASX board (X5) - Gas mother board (X5)

Pin No. Signal
1 Analog ground
2 N/C
3 N/C
4 N/C
5 +15 V
6 -15 V
7 DIRB (not used)
8 RXD
9 TXDB
10 N/C
11 -RESET
12 +5 V
13 +15 VDIRTY
14 Digital ground

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PVX board (X1) - Gas mother board (X3)

Pin No. a b c
1 +15 V NC AGND
2 -15 V NC +10 VREF
3 NC NC NC
4 NC NC NC
5 NC NC NC
6 DAC1 FLOWY NC DAC0 PRES
7 VOL NC NC
8 FLOW NC NC
9 NC NC NC
10 PRESS NC NC
11 NC NC NC
12 NC NC NC
13 NC NC NC
14 NC NC NC
15 NC NC NC
16 NC NC NC
17 -RESET NC NC
18 NC DIR NC
19 NC NC NC
20 NC NC NC
21 RxD NC TxDP
22 NC NC NC
23 NC NC NC
24 NC NC NC
25 NC NC NC
26 NC NC NC
27 NC NC NC
28 NC NC NC
29 NC NC +5 V
30 +15 VDIRTY NC +5 V
31 NC NC NC
32 GND DIRTY NC DGND

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3 SERVICE PROCEDURES

3.1 General service information

Field service of the airway modules is limited to replacing faulty circuit boards or mechanical parts.
The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and
repairs outlined in this section. Unauthorized service may void warranty of the unit.
NOTE: After any component replacement see chapter Adjustments and calibrations

CAUTION The ACX-200 photometer and its components are repaired/calibrated at the
factory. Attempts to repair/calibrate the unit elsewhere will adversely affect
operation of the unit. Datex-Ohmeda supplies spare ACX-200 photometers. The
information provided for the ACX-200 is for reference only.

CAUTION Due to the complicated and sensitive mechanical construction of the O2 measuring
unit, no repairs should be attempted inside the unit.

CAUTION The ACX-200 Measuring board can be repaired and calibrated only at the factory.

CAUTION The PVX-100 measuring unit can be repaired only at the factory.

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3.2 Service check

These instructions include complete procedures for a service check. The service check is
recommended after any service repair. However, the service check procedures can also be used for
determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.

The mark ? in the instructions means that the check form should be signed after performing
the procedure.

3.2.1 Recommended tools

Tool Order No. Notes
Screwdrivers
Tools for blocking internal tubes
A glass of water
Flowmeter
Multimeter
Gas Interface Cable 2.5 m 884299
Sampling line 3.0 m 73319
Spirometry tube 884101
D-lite 733950
Calibration gas 755582

3.2.2 Recommended parts

Part Order No. Notes
Special tube 733383
Special tube 733382
OM ref. filter 86901
Fan filter 871558
Cable tie 64001
D-fend O-ring (2 pcs) 65312
D-fend (black) 876446
Sampling line 3.0 m 73319
Extra silicon tubing
Spare constriction cassettes

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All modules
• Remove the airway module case, the top protection cover and the bronze plate from the
side of the O2 sensor, if installed.
• Detach the ACX measuring board and the PVX board with the support plate, if installed.

NOTE: Wear a static control wrist strap when handling PC boards. Electrostatic discharge may
damage components on the board.
1. Check internal parts:
- screws are tightened properly
- cables are connected properly
- all IC’s that are on sockets are attached properly
- tubes are not pinched and there are no sharp bends on them
- tubes are connected properly
- there are no loose objects inside the module

NOTE: Make sure that none of the tubes is in contact with the sampling pump or the O2
sensor.

?
2. Check external parts:
- the module case is intact
- the four rubber pads under the frame are all in place
- the metal rear panel is intact
- the equipotential tap and the sample gas out connector are tightened properly
- the block screws for the gas interface cable are in place and are tightened properly
- the D-fend latch is functioning properly

?
• Install the ACX measuring board.
• Detach the D-fend.

3. Check the condition of the rubber O-rings on the metal D-fend connectors, located inside
the module front cover.

If necessary, detach the connectors by first disconnecting the tubes, then removing the
locking rings from the back of the front cover.

NOTE: The O-rings are recommended to be replaced annually.

?
4. Check the OM ref. filter (order code 86901) visually, if installed.

NOTE: The OM ref. filter is recommended to be replaced annually.

If the module does not contain the OM ref. filter, install it to prevent dirt entering the O2
sensor reference channel:

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a) shorten the thick O2 reference channel tube by 4 centimeters (the tube that is connected
to the upper part of the CO2 absorber)
b) connect the OM ref. filter to the loose end of the tube
c) fasten the filter to the outermost hole in the tubing plate (at the PVX board side) with a
cable tie (order code 64001)

?
• Replace the D-fend and the sampling line.

NOTE: Use only Datex-Ohmeda sampling lines in order to ensure proper functioning.

• Connect the module to the Central Unit with a long gas interface cable and switch the
monitor on.

• Configure the monitor screen so that all the necessary parameters are shown, for example
as follows:
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - Paw
Field 2 - Flow
Field 3 - Off
Field 4 - O2
Field 5 - AA
Field 6 - CO2
Digit Fields - Field 1 - Gases

5. Check that the module fan is running.

?
6. Wait until the message ‘Calibrating gas sensor’ disappears from the screen, then enter the
Service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)

Take down the information regarding Airway module software.

NOTE: The PVX software string does not appear on the ‘Sw version/Unit id’ -list. Check PVX
software from the sticker that is located on the PVX software EPROM (if the PVX board was
installed originally).

?
7. Enter the ACX service menu:

Parameters - Gas Unit - ACX

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ -values are not increasing
faster than by 50 per second. If one of the values is increasing faster, it indicates a failure in
module bus communication.

?
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8. If the module contains a membrane key on the front panel, press the key at least for one
second and check that it is identified, i.e. the text for Button changes from OFF to ON in the
menu.

?
• Select Halothane as the anesthetic agent by first selecting AGENTS from the ACX service
menu:

Agents - Select Agent - Hal - Previous Menu

9. Check that the Calib zero -value for N2O is less than 61000.

If the value exceeds the limit, it indicates bad contamination in the ACX measuring
chamber. The measuring chamber can be cleaned according to the special cleaning
instructions found in the chapter Cleaning the measuring chamber of ACX measuring unit.
However, if cleaning does not help, the whole ACX measuring unit should be exchanged.

NOTE: If the ACX measuring chamber was cleaned or the unit was replaced, then also the
tubing between the D-fend and the ACX measuring unit, including the zero valve, should be
replaced. The mentioned parts should not be cleaned.

NOTE: With monitor software S-___95 and S-___96 the Calib zero -value for N2O is always
shown as a negative value. The correct value can be calculated by adding the value shown
to the value 65536.

?
10. Check that the Ambient -value corresponds with the current ambient pressure (±20 mmHg).

?
11. Perform the steam test for the special tubes (Nafion), or replace the tubes.

NOTE: The special tubes are recommended to be replaced annually.

?
12. Check the CO2 absorber.

Keep the tip of the sampling line away from you and let the monitor draw in room air. Check
the “Insp CO2” -value from the ACX service menu. If the value is less than 4, replace the CO2
absorber.

?
13. Check the zero valve.
Feed calibration gas into the sampling line and check that the gas readings in the service
menu correspond with the gas values on the calibration gas bottle. Keep feeding gas and
activate the zero valve from the menu. The O2 reading should drop back near 21 %, the
other gas readings near 0 %. If the readings did not drop, replace the zero valve.

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?
14. Perform the sampling system leak test.

?
15. Block the tip of the sampling line with your finger until the ‘Amb-Work’ -value becomes
stable. If the value does not reach 110, replace the sampling pump and repeat the leak
test.

?
16. Check the flow rates, adjust if necessary.

NOTE: If any of the constriction cassettes is replaced, the leak test should be repeated.

?
17. Check that the ‘Amb-Work’ -value is within 50... 75 and the OM (in-ref) -value is equal or
higher than 0. If the values differ, readjust the flows.

?
18. Check the O2 sensor output voltage.

Feed calibration gas and check that the value OM volt: mV in the menu rises at least to
2800 (3500 nominal). Adjust the O2 sensor output, if necessary.

NOTE: The voltage measurement requires module software 884295 or 885388.

If the value is not updated, measure the O2 sensor output voltage from the ACX measuring
board connector X1, pin A9.

C
B
A
1 9

PVX board ACX meas. board

Gas mother board

ASX Measuring unit

The output voltage should rise at least to 2.8 V (3.5 V nominal).

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19. Perform gas calibration:

AIRWAY GAS - GAS CALIBRATION
NOTE: For maximum accuracy, a warm-up time of 30 minutes is recommended.

NOTE: If the module contains the agent identification unit, the ASX-100 or ASX-200, keep
feeding gas at least 15 seconds after the message ‘Adjust’ appears in the menu. This way
the agent identification unit has enough time for calibration.

?
• Enter the ACX service menu:

Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8) -

Parameters - Gas Unit - ACX

• Select Halothane as the anesthetic agent:

Agents - Select Agent - Hal - Previous Menu

20. Perform the fall time measurement in the ACX service menu.

Check that the measured fall times are within the ranges that are given in the Technical
Reference Manual.

NOTE: The fall time measurement can be performed only with module software 884295 or
885388.

?
21. Perform the noise measurement.

Check that the measured noise values are within the ranges that are given in the Technical
Reference Manual.

NOTE: The noise measurement can be performed only with module software 884295 or
885388.

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Agent identification option

22. Check that the ‘ACX_ASX Delay’ -value in the ACX service menu is within 400-800.

If the value is not within the range, readjust the flows and repeat the fall time measurement.

?
• Enter the ASX service menu:

Gas Unit - ASX

NOTE: The ASX service menu values are not updated with the anesthetic identification unit
ASX-100.
23. Feed calibration gas. When the proper absorption spectrum is shown in the menu check
that the Peak normal value is close to 10.50 (±0.20). Check also that the difference
between the “Peak normal” and “Peak mirror” values is not higher than 0.30.

If the values do not meet the range, repeat the gas calibration.

?
• Set the AA identification to the automatic mode:

Agents - Select Agent - Auto - Previous Menu

24. Feed calibration gas (order code 755583) and check that the message 'Desflurane'
appears into the digit field for gases.

NOTE: The ASX-100 is not capable of identifying Desflurane.

NOTE: The ASX-100 with software 878364-1.1, or lower, is not capable of identifying
calibration gas R23 (order code 755582). Therefore, the message ‘Agent mixture’ should
appear instead.

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Patient spirometry option

• Switch the monitor off and install the PVX board, then switch the monitor back on.
• Preset gas measurement settings:

Airway Gas - Spirometry Setup - Paw Scale - 20

Flow Scale - 15

1. Check that the patient spirometry connectors on the front panel are clean and intact.

?
2. Connect a clean spirometry tube to the module and a clean D-lite to the other end of the
tube. Block the D-lite’s sampling line port, for example with a luer stopper.
Take the D-lite in your hand and occlude both ends tightly with your fingers (or with both
hands). Pressing firmly with the fingers creates a pressure inside the D-lite. Check that a
pressure of at least 5 cmH2O is generated.

NOTE: If the module has the male and female patient spirometry connectors (pediatric
option), make sure that the date marking on the D-lite is 10/94 or newer.

If the system leaks heavily, no pressure will be generated.

If there is a small leak in the connections, the monitor will measure a pressure difference
which is then interpreted as flow and seen on the monitor screen. The pressure waveform
decreases slowly and the flow waveform either goes above, or below the zero line,
depending on which of the connectors leak.

In case of leakage, check all connections and try again.

?
3. Remove the blockage from the sampling line port and connect the sampling line. Breath
through the wider side of the D-lite. Check that the flow waveform moves downwards when
you breath in, and upwards when you breath out.
If the flow waveform moves in opposite manner, check the order of the PVX tubes inside the
module.

?
4. If possible, also check the patient spirometry measurement with the spirometry tester (order
code 884202). Follow the instructions that are supplied with the tester.

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All Airway modules

• Switch the monitor off, disconnect the gas interface cable and reassemble the module.

NOTE: When reassembling the module, make sure that the tubes and cables are not
pinched between the PC boards and covers.

29. Clean, or replace the airway module fan filter.

?
30. Perform electrical safety check and leakage current test.

?
• Reconnect the gas interface cable and sampling line, switch the monitor on and wait until
the message ‘Calibrating gas sensor’ disappears from the screen.

31. Block the tip of the sampling line with your finger and check that the message ‘Sample line
blocked’ appears onto the monitor screen within 30 seconds.

?
32. Detach the D-fend and check that the message ‘Check D-fend’ appears onto the screen
within 30 seconds.

Reattach the D-fend.

?
• Simulate at least 5 breaths by feeding calibration gas into the sampling line.
Check that the shown gas information is correct.

33. Check that the monitor activates the APNEA -alarm within 30 seconds after you have
stopped feeding gas.

?
34. Switch the monitor off, disconnect the gas interface cable and clean the module.

?
• Fill in all necessary documents.

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3.3 Disassembly and reassembly

The airway module (G-AiOV) is disassembled in the following way. See the exploded view.
1. Remove three screws from the rear panel.
2. Remove one thumb screw and one 5 mm cross recess screw from the bottom of the airway
module case.
3. Slide the case rearward and detach it from the module.
4. Lift off the top protection cover.
The PVX board can be detached by pulling sideways after two tubes are disconnected from two
valves.
The ACX measuring board can be detached by pulling sideways after a ribbon cable connector is
disconnected and a tube is pulled off from pressure transducer.
5. Remove the bronze plate from the right side of the module by pulling it up.
6. To remove the gas mother board cover, remove two front panel screws from the side of the
module, and the D-connector screws.
7. The front panel can be detached by removing three screws.
8. Tubing system plate with tubes and flow cassettes can be lifted off.
9. Fan can be lifted off after plastic pc board rail is detached.
The gas mother board is attached to the side of the module with screws.
The ASX unit, the ACX measuring unit, and the O2 measuring unit are attached to the chassis with
two screws each.
The pump and its magnetic shield can be removed from the chassis by unscrewing the two screws
beneath two springs at the port side of the pump.
Damping chamber/filter case can be slid out of hooks.
Reassembling is essentially reversing what was described above.

CAUTION When reassembling the module, make sure that the tubes and cables are not
pinched between the boards and the cover.

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3.4 Adjustments and calibrations

3.4.1 Gas sampling system adjustment

Flow rates should be measured and possibly adjusted under the following conditions:
• After any part within the sampling system has been replaced
• Gas response is slow
NOTE: Adjust the flows with a new, clean D-fend water trap and original Datex-Ohmeda sampling
line.
NOTE: Before adjusting the flows, make sure that there is no leakage in the sampling system.
NOTE: Let the monitor warm up for 30 minutes before measuring flow rates.
For the flow rate measurements a flowmeter with a low flow resistance and capability to measure
low flow rates is required. A normal length of sampling line has to be connected to the monitor as it
has a considerable effect on the flow.
The flow rates are adjusted by changing the flow resistance cassettes (constriction cassettes) in the
sampling system. See Table 2 in chapter “Gas sampling system” for the alternative cassettes.
The adjustments and the respective constrictions to be adjusted are shown in the next figure, see
also chapter “Gas sampling system” to see gas sampling system block diagrams for modules
manufactured since autumn 1998.

3.4.2 Flow rate measurement

If any flow rates are not correct, first replace the D-fend water trap. Then recheck the
incorrect flows before adjusting the flow rates.
The sampling flow rate is measured by a flowmeter at the sampling line. The rate should be
between 180 and 220 ml/min.
The sampling flow rate is adjusted by changing the flow cassette which is located between the
pump and the damping chamber.
Due to two different tubing layouts, if the described location does not contain a flow cassette, the
sampling flow rate is adjusted by changing the flow cassette that is located between the pump and
the sample gas out connector.

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G-gas_samplsyst_chart.vsd

Figure 16 Gas sampling system adjustment chart

See also chapter “Gas sampling system” to see gas sampling system block diagrams for modules
manufactured since autumn 1998.

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The rate of the side flow is checked by blocking the side flow after the water trap and measuring the
flow rate as above. The rate should decrease by 10 to 27 ml/min.
Measurement flow and reference flow of the oxygen measuring unit are checked as follows:
1. Connect the flowmeter behind the flow cassette (no. 2) ahead of the oxygen measuring unit
REF inlet. The flowmeter should show between 25 and 42 ml/min. The flow rate is adjusted
by changing the cassette.
2. Connect the flowmeter between the oxygen measuring unit IN inlet and the tube which is
connected to it. The flow rate should be between 18 and 25 ml/min larger than the REF
flow. This is adjusted by changing the flow cassettes (no. 4 and 5) which are located
between the IN and OUT inlets.
3. Flow rate of CO2 absorber is measured by connecting the flowmeter to the unoccupied
connector of the flow cassette (no. 1). Make sure that the monitor is in normal situation
(APNEA text on the screen). The flow rate should be zero. When the gas zeroing takes place,
the rate should be between 180 and 220 ml/min. The gas zeroing can be simulated in the
ACX Service Menu manually (pump start, zero valve on). The flow rate is adjusted by
changing the cassette (no. 1).

CAUTION When changing cassettes make sure that the tubes are reconnected properly.
Flow to be adjusted Constr. No. (see figure 16) Nominal value (tolerance)
ml/min
sampling flow 6 200 (180 to 220)
side flow 3 10 to 27
O2 measurement in 4 and 5 45 to 60
O2 reference in 2 25 to 42
CO2 absorber flow 1 180 to 220 when zeroing

NOTE: Changing any of the cassettes will have some effect on the other flow rates. After any
adjustments check the other flow rates as well.

O2 measurement flow pressure

Gradual decrease of main flow rate due to the water trap filter clogging can be checked by
measuring pressure difference between the O2 measurement flow and the O2 reference flow.
Remember that the sampling line should be attached to the water trap before starting the test.
The pressure difference is automatically checked after every gas zeroing.
See ACX Service menu chapter later in this manual for further information.

3.4.3 Oxygen measurement unit adjustments

The only field service procedures for the O2 measuring unit are the offset (zero), gain, and frequency
adjustments. In case of any other trouble, the measuring unit should be replaced and the faulty
one sent to Datex-Ohmeda for repair.

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Offset (zero) adjustment

Because the oxygen measuring unit is a differential sensor, which actually measures the difference
between the O2 concentrations in the sample and reference gases, its output must be adjusted to
equal zero when atmospheric air is present at both inputs.
1. Connect a digital voltmeter to the output of the O2 measuring unit at pin 7 of connector X4
on the Gas mother board.
2. Let the monitor draw in room air and adjust the voltage to zero with the O2 measuring unit
trim resistor designated 'ZERO' (see figure 17) in the O2 module PC board. The
potentiometers are located at the same side of the measuring unit as the tubing connectors.
3. Perform gas calibration (see User’s Reference Manual).

Gain adjustment
1. Adjust the O2 measuring unit offset as described in the previous section.
2. Sample 100 % oxygen and adjust the measuring unit output to between 7.7 V and 8.3 V
with the trim resistor designated 'GAIN' (see figure 17). If the output will not exceed 7.7 V, it
is acceptable that the output exceeds at least 5 V. At that level software is still able to
compensate the output.
3. Check and if necessary readjust the offset and gain until the readings remain stable.
4. Perform gas calibration (see User’s Reference Manual).

Temperature compensation adjustment

Factory calibrated.

Frequency adjustment
The switching frequency of the electromagnet of the O2 measuring unit has been selected to be
110 Hz to avoid interference from harmonics of both 50 Hz and 60 Hz mains frequency.
Fine adjustment is seldom necessary. However, if you wish to reduce the effects of mechanical
resonance peaks of the cabinet which appears as high noise level of the O2 measuring unit analog
output (above 20 mV peak to peak) it is worth of trying the fine frequency adjustment. One turn of
trimmer ’FREQUENCY ’ will change the frequency by 1.5 Hz. Try to find minimum noise but do not
deviate more than ±5 Hz.

Gas calibration
The gas calibration is performed in the Airway Gas -menu. Calibrating
The airway module should be calibrated once every six months or whenever there are indications of
errors in the gas readings.
Calibrate the gas measurement with the Datex-Ohmeda calibration gas. Do not use any other
calibration gases.
− When you calibrate the modules M-C, M-CO or M-COV, use the gas 755581 and the
regulator 755534.

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− When you calibrate the modules M-CAiO, M-CAiOV or M-CAiOVX, use the gas 755583 and
the regulator 755534.
If you do not use the recommended calibration gases, the calibration does not succeed.
During gas calibration,% units are always used for CO2 regardless of selected measuring units.
Anesthetic agent is always calibrated with Desflurane selected. If some other agent is selected for
monitoring, the selection is stored in the memory and returned when the calibration is over.
ZERO
TEMP.COMP.
GAIN
FREQUENCY

Gas connectors

OUT IN REF

Vibration insulation

Figure 17 O2 measuring unit adjustments

3.4.4 Flow calibration

PVX board is calibrated at the factory and due to the board’s design calibration is not regularly
needed. The calibration data is saved into the board’s EEPROM memory and if the software EPROM
of the board is changed the calibration must be performed. It is recommended to perform the
calibration both with adult values using the D-lite, and with pediatric values using Pedi-lite.
1. Connect a spirometry tube with the D-lite sensor to the airway module. To improve the
accuracy, the endotracheal tube and all accessories which are in normally use should be
attached also during the calibration.
2. Enter service menu (Monitor Setup/Install Service/Service View/Modules).
3. Enter the PVX menu. After the flow is zeroed ('Zero OK' message displayed) attach
calibration pump or spirometry tester to the flow sensor (D-lite or Pedi-lite). Select the
sensor type.
4. Set the calibration volume for adult to 1000 ml and for pediatric to 300 ml.
5. Work on the calibration pump slowly, approximately 1 pump in 5 seconds, pump until
'adjust'-message appears. If you use the spirometry tester, perform the calibration
according to the tester instructions.
6. Adjust the reading to match the calibration volume (1000 ml for the D-lite and 300 ml for
the Pedi-lite).

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4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Possible Cause/Treatment
No response to breathing Sampling line or water trap blocked or loose, or improperly attached.
Water trap container full.
Interface cable to monitor disconnected.
See chapter “Gas sampling system troubleshooting.”
SENSOR INOP. message The temperature is too high, check fan and filter at the rear panel.
Communication error, check timeout and bad checksum values at the service menu.
Check Airway Module connection cable and supply voltages.
Check ACX measuring board.
xx ZEROING ERROR-message Gas zeroing failed. Condensation or residual gases are affecting zero measurement. Allow module to run
drawing room air for half an hour and calibrate again.
AIR LEAK-message Air leak in sampling system. Probably water trap or the sampling line is not attached properly. Gas zero
valve failure. Pump failure or gas outlet blockage. Supply voltage missing
REPLACE TRAP-message Flow resistance increased due to residue built-up on water trap membrane. Replace the water trap.
REBREATHING-message CO2 concentration in inspiratory air is too high. Possibly CO2 absorber in ventilator is saturated. Change
the absorber.
OCCLUSION-message Sampling line or water trap is occluded. Water trap container is full. If occlusion persists check internal
tubing for blockages. Check the power supply voltages.
SELECT AGENT-message No anesthetic agent is selected though delivery is started. Vaporizer valve is broken. Traces of cleaning or
disinfecting agent in the water trap container affecting the readouts. Replace the water trap.
No response to any gas Sampling line, water trap, or internal tubing blocked or loose, or improperly attached.
Pressure valve malfunction. Pump failure. Supply voltage missing. Serial communication error. Check
those items.
Sudden increase in gas display Measuring chamber contamination.
±15 V supply voltages missing.
Water trap malfunction. Check all internal tubing and the interior of the water trap for occlusions or leaks.
Replace water trap.
Check flow rates.
Abnormally high response to all Pressure transducer failure. Exchange the ACX Measuring board.
gases (or abnormally low) or
sudden occlusion warning
Random output (resembling Chopper motor timing pulses out of sync.
noise) Chopper motor not running, motor faulty or connection loose.
Chopper motor driver transistor C-E open circuit or current limiter short circuit.
Exchange the ACX measuring board.
Strong drift in all gases Leakage in the sampling line or internal tubing (especially in conjunction with too low readings).
Exchange the ACX measuring board.
No gas waveforms Gas waveforms are not shown during automatic zeroing, occlusion, or air leak. Check the monitor screen
intermittently. for possible messages and proceed accordingly.

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4.1.1 Supply voltage troubleshooting

Trouble Possible Cause Treatment
“Gas module removed” +5V lost Gas module CPU not running. Check Gas Interface
No Gas module exists after turning the cable.
monitor on. Check +5V from module mother board and timeout
value from module service page.

Random CO2 value. +5 Vdirty lost Check the IR lamp resistance (approximately 4
No CO2 or AA response. Ohm)and the lamp voltage (module mother board
Abnormal AA mixture messages and AA connectors X8 and X9)
selections. X8 = ASX lamp(i-models)
“Unknown Agent” X9 = ACX lamp
“Zero error” after zeroing
“Calibrate Agent ID”
“Sensor Inop”

“Continuous Occlusion” +15 V lost Check voltage from module mother board X1 pin 4,
“Sensor Inop” X2 pin 1a, X3 pin 1a, X4 pin 9 and X5 pin 5.
Random curve trace and gas digit
values(resembling noise).
Pressure and flow curves extremely low.

CO2 value high. -15 V lost Check voltage from module mother board X1 pin 2,
“Air leak” X2 pin 2a, X3 pin 2a, X4 pin 6 and X5 pin 6.
“Sensor Inop”
Paw and Flow curves extremely high.
“Air Leak”-message remains on the screen. +15 V dirty lost Check voltage from module mother board X1 pin 3,
X2 pin30a , X3 pin 30a, X4 pin 1 and X5 pin 13.

Fan stopped. +32 V lost Check the fuse on Gas interface board.
Check the fan and regulated fan supply voltage from
module mother board connector X10.

“Calibrating gas sensor” remains on the One or more of the voltages lost: Check those voltages as above.
screen. +5 Vdirty, +15 V,-15 V, +15 Vdirty

ACX measuring board not Check whether the ACX software version is available
communicating with the Gas in the service menu. If not, replace the ACX
mother board. measuring board.
ACX measuring unit badly Replace the ACX measuring unit.
contaminated.

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4.2 Gas sampling system troubleshooting

The faults which can occur in the sampling system are: leaks or blockages in the tubing, failure of
the sampling pump or the magnetic valves, or diminishing of the flow rates because of pump aging
or dirt accumulating in the internal tubing.
The following checks should help in localizing the fault. Whenever suspecting the sampling system
and always after working on the sampling system check and if necessary adjust the flow rates.
The sampling system details are illustrated in figures 5, 6, 7 and 8.

CAUTION The special internal sample tube is mechanically fragile. Sharp bends will cause
leaks.
NOTE: D-fend water trap should be replaced when the OCCLUSION message appears during the
monitor startup.
NOTE: If any liquid has entered the ACX-200 measuring unit due to water trap filter failure, contact
Datex-Ohmeda technical services.

4.2.1 Sampling system leak test

Connect power cord and sampling line. Turn the power on and wait until the initialization is over.
1. Choose ACX service data page in the Gas unit service menu.
2. Connect a tube to the sample out connector and drop its other end into a glass of water.
3. Block the sample inlet, reference flow of the oxygen measuring unit, and the CO2 absorber
port that draws room air in. Wait for one minute.
There should be less than 1 bubble per 10 seconds coming out of the tube. Bubble should
not move upwards more than 11 mm per 30 seconds inside the tube. If it does, there is a
leak between the pump and the sample out connector.
4. Perform leak test to the CO2 absorber by opening zero valve. The maximum permitted
leakage is the same as above.

CAUTION Do not turn the pump off while performing the leak test. Negative pressure in the
sampling system will suck water into the module.

4.2.2 Water separation

1. Dip the patient end of the sampling line into water quickly (about a half second) three times
at 45 seconds' interval. After that drop the end into water and lift it up when the sampling
line is totally filled with water.
2. Check that all the water goes into the trap container and not into the monitor.

4.2.3 Steam test for the special tubes

Choose Halothane as anesthetic agent and let the monitor sample room air. Then quickly feed air
of 100 % relative humidity (for instance from a kettle in which you are boiling water) to the monitor.
If the digital reading jumps as much as 0.1 % replace the special (Nafion) tubes.

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4.3 OM measuring unit troubleshooting

Because of the complex and very sensitive construction of the oxygen measuring unit no repairs
should be attempted inside the unit. Instead, if the fault has been found in the measuring unit
itself, it should be replaced and the faulty unit be sent to Datex-Ohmeda for repair.
In cases of no response to O2 or strong drift, check the tubing for loose connections, blockages and
leaks.

CAUTION Never apply overpressure to the O2 measuring unit as the pressure transducer may
be permanently damaged.
If the message ‘O2 zero error’ is displayed check the O2 measuring unit output voltage on Gas
mother board (see Section Offset adjustment).
If the adjustment range of the (software) calibration is insufficient check the O2 measuring unit
output voltage and adjust the gain if necessary (see Section Gain adjustment).
If there are problems with O2 response time check the O2 measurement flow rate and adjust it if
necessary (see Section Gas Sampling System Adjustments).
If the O2 signal is noisy, check the measurement unit suspension. Frequency adjustment may help
in some cases (see Section Frequency adjustment).

4.4 ACX troubleshooting

CAUTION The measuring unit ACX-200 can be repaired and calibrated only at the factory.
The ACX troubleshooting is carried out in the General Troubleshooting scheme. The ACX testing is
explained at the ACX service information section, please refer to it.

4.4.1 Cleaning the measuring chamber of ACX measuring unit

In case the N2O “zero calibration constant” in Gas Service (ULT) or N2O “calib zero” in ACX Service
(AM/CCM) indicates contamination of the measuring chamber (value 61000 or more), or if the
software will stuck to the “calibrating gas sensor” state due to contamination, it is possible to
attempt the measuring chamber cleaning. However, Datex-Ohmeda recommend exchanging the
measuring unit rather than cleaning.
The measuring chamber should first try to be cleaned by rinsing it with distilled water only. If rinsing
alone is not sufficient the cleaning can be tried with Datex-Ohmeda Cleaning Fluid (85969).
NOTE: Do not use other cleaning agents such as blood gas electrode cleaners. These may damage
the unit.

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Cleaning procedure
Tools needed
• 10 ml syringe
• water glass
• 2 pcs 30 cm silicon tubes with inner diameter of 3 mm
• screwdriver
1. Detach the measuring unit from the monitor or gas module.
2. Attach the silicon tubes to the tube connector on the unit.
3. Attach the 10 ml syringe to one of the tubes.
4. Place the tip of the other tube into the water glass.
5. Pour some distilled water into the glass.
6. Suck the water into the tubing with the syringe.
7. Leave for 15 minutes.
8. Move the syringe piston in and out 10 times.
9. Detach the tubes from the unit and empty the water from the measuring chamber.
10. Attach one silicon tube to the unit and connect the other end of the tube to the gas outlet of
the monitor or gas module.
11. Switch the monitor on and let the sample out flow dry out the unit at least for 15 minutes.
12. Attach the unit back to the monitor or gas module and switch the monitor on.
13. Let the monitor run at least 30 minutes before checking the calib zero in the service mode.
14. If the zero value is still more than 61000, repeat the procedure with the cleaning fluid.

NOTE: After cleaning with the cleaning fluid the measuring chamber must be well rinsed with
distilled water.
NOTE: The monitor will stay in “Calibrating gas sensor” state until the measuring chamber is
completely dry.

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4.5 ASX agent identification unit troubleshooting

NOTE: Please read also the troubleshooting section in User’s Reference Manual.

CAUTION The agent identification bench ASX-200 can be repaired and calibrated only at the
factory.

Trouble Possible Cause/Treatment

AGENT MIXTURE-message when Repeat calibration.
calibration gas (Freon) is fed. If the module contains ASX-100, it is not capable to identify calibration gas R23, therefore the
message. However, the ASX-100 will still calibrate with R23.
No response from ASX. Communication between ASX unit and Central Unit is lost. ASX bench disconnected or faulty.
Check that the motor is running.

No identification

Is the
ASX software Go to ASX service
on the software list YES view and check peak
on the service normal value
wiev?

NO

Is ASX motor NO Check ASX unit

running? supply voltages

YES

Check Err status in Gas

Mother board service page.
Fault in serial communicat.,
ReplaceASX board or Gas
Mother Board.

Figure 18 ASX troubleshooting flowchart

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4.6 PVX board troubleshooting

CAUTION The measuring unit PVX-100 can be repaired and calibrated only at the factory.
NOTE: Never apply DIFFERENTIAL pressure higher than 25 cmH2O to the spirometry tubing. Make
sure that both spirometry tubes are always connected.
NOTE: Never apply overpressure or negative pressure of more than 300 cmH2O to the spirometry
tubing.

No spirometry

Is the
PVX software Go to PVX service
on the software list YES view
on the service
view?

NO

Check Err status in Gas

Mother board service page.

Figure 19 PVX board troubleshooting flowchart

NOTE: The PVX software string does not appear on the list when using the combination of G-AOV
module and monitor software S-___94.

4.6.1 Spirometry tubing leak test

1. Select airway pressure (Paw) and flow waveforms (Flow) on the monitor screen.
2. Connect a clean spirometry tube to the module and a clean D-lite to the other end of the
tube. Block the D-lite’s sampling line port, for example with a luer stopper.
NOTE: If the module has the male and female patient spirometry connectors (pediatric option),
make sure that the date marking on the D-lite is 10/94 or newer.
3. Take the D-lite in your hand and occlude both ends tightly with your fingers (or with both
hands). Pressing firmly with the fingers creates a pressure inside the D-lite.
4. Check that a pressure of at least 5 cmH2O is generated. If the system leaks heavily, no
pressure will be generated. If there is a small leak in the connections, the monitor will
measure a pressure difference which is then interpreted as flow and seen on the monitor
screen. The pressure waveform decreases slowly and the flow waveform either goes above,
or below the zero line, depending on which of the connectors leak.

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4.7 Gas mother board troubleshooting

Due to the complexity of the LSI circuitry there are only a few faults in the CPU digital electronics
that can be located without special equipment.
Check that the RAM, EPROM, CPU and other IC’s that are on the sockets are properly attached.
See Gas mother board service pages for more information.

4.7.1 Instructions after replacing the software or Gas mother board

After replacing the software or Gas mother board:
• perform the sampling system leak test
• check the flow rates
• perform the gas calibration

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4.8 Error messages

Message Explanation
Occlusion The sample tube inside or outside the monitor is blocked or water trap is
occluded. If occlusion persists, measured gas values disappear.
Air leak - the water trap is not connected
- the gas outlet is blocked
- there is a leak in the sampling line inside the module. If air leak persists
measured gas values disappear.
Replace trap Indicates residue build-up on the water trap membrane. This decreases air
flow.
Zero valve error Opening the valve does not change working pressure enough.
Gas calibration is not available during the first 5 Calibration not allowed during the first 5 minutes after power up and in
minutes/during occlusion/during air leak mentioned situations.
Select agent No agent selected.
Continuous occlusion. Check sampling line and water trap. Occlusion over 40 seconds.
Air leak detected. Check water trap and sample gas out-flow. Air leak over 40 seconds.
Press normal screen to continue.

CO2
Zero error Unsuccessful zeroing
Unstable Unsuccessful calibration
CO2 over scale CO2 signal exceeds the maximum waveform area
O2
O2 zero error Unsuccessful zeroing
O2 over scale O2 signal exceeds the maximum waveform area
O2 Unstable Unsuccessful calibration
N2O
N2O zero error Unsuccessful zeroing
N2O Unstable Unsuccessful calibration
Ane agents
AA zero error Unsuccessful zeroing
Zero error
AA unstable Unsuccessful calibration
Unstable
AA over scale AA signal exceeds the maximum waveform area
Menu messages during calibration
Zero error Unsuccessful zeroing
Adjust Calibration gas accepted and monitor is ready for adjusting the gas values
to match the calibration gas concentration
Unstable Unsuccessful calibration

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5 SERVICE MENU

1. Press the Monitor Setup key.

2. Select Install/Service (password 16-4-34).
3. Select Service (password 26-23-8).
4. Select Parameters - Gas Unit.

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5.1 Gas mother board

Service Data
Oper State
Internal operation state of the module:
0...9 function performed, if staying on, failure is indicated
10...29 Initialization
30...39 Normal operation state
40...49 Zeroing
50...59 Calibrating
ERR status
Indicates measuring unit malfunction:
GAS:
0 no error
1 error in ACX measuring system
2 error in ACX communication
10 error in ASX measuring system
20 error in ASX communication
40 error in PVX measuring system
80 error in PVX communication
Possible failure source: Gas CPU, ACX, ASX or PVX.
ACX:
0 no error
if not 0, replace ACX unit
ASX:
0 no error
if not 0, replace ASX unit
PVX:
0 no error
if not 0, replace PVX unit

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Serial Comm(unication)
Serial Communication indicates a state of serial communication between the module processor
and a measuring unit.
GAS: FFFF Continuously
ACX: FFFF Continuously
ASX: Value is for factory use only.
PVX: Value is for factory use only.
Rep status
Rep status is a four-digit number, where all digits, abcd , can have different values.
Gas rep status:
a
0 No sevoflurane or desflurane measurement available
3 ACX can measure sevoflurane and desflurane
b
0 No gas measurements available
F CO2, O2 N2O and AA measurements available
3 CO2 and O2 available
c
0 No ACX, ASX, nor PVX board running
1 ACX board running
3 ACX and ASX board running
5 ACX and PVX board running
7 ACX, ASX and PVX board running
d
0 Normal operation state
1 Occlusion
2 Air leak
4 Other sampling system error
8 Replace trap
ACX rep status:
a
empty Normal operation state
1 ACX initialization
b
empty Normal operation state
2 Occlusion
4 Air leak
c
C Normal operation state
others values used in manufacturer's testing
d
0 Normal operation state
others values used in manufacture's testing
ACX rep status FFFF continuously

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PVX rep status FFFF continuously

General Status
0 Normal operation state
8000 Initialization
If not 0 or 8000, replace the gas mother board.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor's inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected.
The monitor starts counting these items at power up and resets to zero at power off. The nonzero
values do not indicate a failure, but the continuous counting indicates either serial communication
failure or module not in place.
The timeouts etc numbers should not grow faster than 5 per second.

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5.2 ACX service menu

Pump ctrl Turns pump on/off

Zero valve ctrl Turns zero valve on/off
Pres valve ctrl Turns pressure valve on/off
Noise Meas Noise measurement.
Fall time Meas Fall time measurement.
Service Data
Fall time
Fall time indicates the response time of the measuring units. Select ‘Fall time meas’ from the
menu. Notice that text ‘feed’ appears under each gas. Feed the calibration gas until every ‘feed’ is
replaced by ‘start’. Remove the sampling line quickly from the gas source.
Check that fall times are:
O2 < 480 ms
CO2 < 360 ms
N2O < 360 ms
AA < 520 ms
NOTE: The measurement can be performed only with the modules using module software 884295.
Noise measurement
O2, CO2 and N2O
Feed the calibration gas until the gas values are stabilized on screen. Start the measuring by
selecting ‘Noise meas’ from the menu. After 10 seconds stop measuring by reselecting ‘Noise
meas’. Close the gas source. Noise values should be: O2< 100, CO2 < 20, N2O< 150.
AA
Select halothane for anesthetic agent. Feed the room air until gas values are stabilized. Perform the
noise measuring as above, the value should be < 20.
NOTE: The measurement can be performed only with the modules using module software 884295.

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Calib zero and gain

These values are calibration constants of zero and gain for each gas. The zero values may change
at gas zeroing, the gain values at gas calibration.
When the monitor performs gas zeroing, the main software will write zero constants for the gases
(CO2, N2O, AA, O2) to the ACX memory. If some dust (or water) has entered the measuring chamber,
zeroing of the gases require higher zero constants than before depending on the contamination
level. If some gas requires higher value than 65536 the unit is not able to perform the zeroing and
the message ‘XXX ZERO ERROR’ appears to the error list and the software recalls the previous zero
constant for the concerned gas. If this happens at the initial start up the software will not pass the
“calibrating gas sensor” state.
The N2O zero point is very sensitive for the measuring chamber contamination. Therefore the zero
constant of N2O can be utilized in observing the contamination level of the ACX measuring
chamber. The optimum value for the N2O zero constant with new and clean measuring chamber is
45000 indicating the ratio of 1:1 between the measuring and reference channel signals. The
maximum acceptable value for the N2O zero constant is 51000, for a new measuring unit. The
maximum value that the main software is able to set is 65536.
Exp, Insp
Gas concentration value from the ACX measuring unit.
Pressures
Ambient is the ambient pressure measured at the initialization. Work press is the internal pressure
of sampling system measured by the ACX measuring board pressure transducer. The difference
between these two pressures is Amb-Work and if the pump is functioning, it should normally be
within 50...75.
OM(in-ref) is a pressure difference between the O2 measurement flow and the O2 reference flow.
This pressure difference is automatically checked after every gas zeroing and it should be between
5 to 10 mmHg. If the pressure difference turns negative a message ‘Replace trap’ is displayed
when the limit of -5 mmHg is exceeded.
In S-___97 and S-___98 software there is a software flaw in displaying the pressure difference, OM (in-ref). The flaw does not have any
effect on the functioning of the ACX unit. The operational limit for the ‘Replace Trap’ message is -5 mmHg as in previous SW versions.
The flaw is only in the displaying of the pressure difference value. With S-___97/98 software the pressure difference can be checked in
a following way: turn the pressure valve ON for five seconds. This enables the updating of the OM (ref) value. Turn the pressure valve OFF
and wait for five seconds. Now calculate the difference between Work press and OM (ref).
Pump, zero valve, and pressure valve are operated manually by highlighting and pushing the
ComWheel. During patient monitoring, the valves are in OFF position
ACX temp indicates temperature inside the ACX bench, and the value is typically +10 °C higher
than the prevalent room temperature.
Delays indicate the time delays within or between measurement units.
Delays are measured at the same time as fall times.
Check that the ACX_ASX delay is between 400-800.
NOTE: The measurement can be performed only with the modules using module software 884295.
Timeouts is a cumulative number that indicates how many times the module has not responded to
the monitor’s inquiry.
Bad checksums is a cumulative number that indicates how many times communication from the
module to monitor broke down.
Bad c-s by mod is a cumulative number that indicates how many communication errors the
module has detected. The monitor starts counting these items at power up and resets to zero at
power off. The nonzero values do not indicate a failure, but the continuous counting (more than 50
per second) indicates either serial communication failure or module not in place.

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5.3 PVX service menu

Service Data
Aw Pres Zero...The value of airway pressure zero is changing within the range of 1000 to 2400.
*) Aw Pres Gain...Gain of pressure measurement. This value should be fixed to 8662.
Flow Zero....The value corresponds to the pressure transducer B1 output during PVX zeroing.
Number 0 corresponds to 0 V and 4095 corresponds to 10 V. The value is typically within the range
of 100 to 4000.
Insp Flow Gain...Gain of inspired gas volume. Typically the value is between 5000 and 9000
depending on which sensor is used (adult/pediatric).
Exp Flow Gain...Gain of expired gas volume. Typically the value is between 5000 and 9000
depending on which sensor is used (adult/pediatric).
*) Common Offset...Cancels common error which is caused by pressure from the pressure
transducers. This is a transducer's own constant. The value should be between -230 and +230.
Valves...Position of zero valves.
Zeroing....Automatic zeroing is cancelled (disabled) or active (enabled).
*) NOTE: Items marked with asterisk (*) are not to be changed.
NOTE: The values shown are for the Adult module only. Changing the mode does not change the
values.

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5.3.1 Flow calibration

Flow calibration
PVX board is calibrated at the factory and due to the board’s design calibration is not regularly
needed. The calibration data is saved into the board’s EEPROM memory and if the software EPROM
of the board is changed the calibration must be performed. It is recommended to perform the
calibration both with adult values using the D-lite, and with pediatric values using Pedi-lite.
1. Connect a spirometry tube with the D-lite sensor to the airway module. To improve the
accuracy, the endotracheal tube and all accessories which are in normally use should be
attached also during the calibration.
2. Enter service menu (Monitor Setup - Install Service - Service - Parameters).
3. Enter the PVX menu. After the flow is zeroed (‘Zero OK’ message displayed) attach
calibration pump or spirometry tester to the flow sensor (D-lite or Pedi-lite). Select the
sensor type.
4. Set the calibration volume for adult to 1000 ml and for pediatric to 300 ml.
5. Work on the calibration pump slowly, approximately 1 pump in 5 seconds, pump until
‘adjust’-message appears. If you use the spirometry tester, perform the calibration
according to the tester instructions.
6. Adjust the reading to match the calibration volume (1000 ml for the D-lite and 300 ml for
the Pedi-lite).
NOTE: The last calibration dates are saved in the main CPU board memory.

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5.3.2 Temp & Hum service menu

If circumstances noticeably differ from normal, or additional accuracy is required, the use of Temp
& Humidity menu may be advisable.
Especially small errors in tidal values may indicate that temperature and humidity settings of the
monitor differ too much from the used system.
Room Temperature and Humidity
These are needed only in calibration procedure.
Insp Temperature
The temperature of inspired gas. The value is used in calculations. Change if necessary.
Insp Humidity The humidity of inspired gas. The value is used in calculations. Change if necessary.
Exp Temperature The temperature of expired gas. The value is used in calculations. Change if necessary.
Exp Humidity The humidity of expired gas. The value is used in calculations. Change if necessary.

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5.4 ASX service menu

NOTE: The ASX service menu in monitor software S-xxx94 or newer supports only modules
equipped with the ASX-200.

Service Data
ID result displays the identified gas or mixture
Total % is the anesthetic agent concentration measured by ASX bench.
Rel % is the relative percentage of each measured agent in the mixture.
Noise value should be less than 80. Check the value only when no gas is fed and after a minimum
of one minute stabilization time.
Temp C is the temperature inside the ASX unit.
AGC (Automatic Gain Control) should be between 100 and 3500.
Motor DAC is a motor speed control voltage, 100...3900, and Motor Fluct is the speed
fluctuation, should be < 200.
Alc comp val is the compensation factor for alcohol content measured during halothane, enflurane
or isoflurane measuring. Sta shows the status of compensation, 0 means off, and 1 means on.
The value without a leading text is for factory use only.
Peak normal, Peak mirror give the place of the spectrum’s peak in the channel numbers. The peak
normal value should be 10.3- 10.7 with calibration gas R23, and 12.9-13.1 with R22. If the value
is not within the range, the gas calibration must be performed (see User’s manual for instructions).
Time offset is the time between motor synchronization pulse and filter 0° angle. Fact is the factory
value for it, EEPRO is the user calibration result, stored in the ASX, and RAM is the user calibration
result, stored in the gas mother board.
Spectrum values relate to the scales of the spectrum display.

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6 SPARE PARTS

Figure 20 Exploded view of Airway Module

6.1 Spare parts list

6.1.1 G-AO rev. 01..05, G-AiO rev. 00…05, G-AOV rev. 00…04, G-AiOV rev. 00…04, G-O rev.
00…01
Item Description Order No Replaced by
- Block screw for cables 546096
- Nafion tube (A or B, 500 mm: see manual) 733383
- Nafion tube (C, 300 mm) 733382
- Spring for D-Fend 875598
- Membrane keypad, G-AO / G-AOV 879371
- Thumb screw, AS/3 Airway Module 879511
1 Rear panel sticker, All Airway Modules ; S/5 8000246
1 Rear panel sticker, DE 880462 894181
1 Rear panel sticker, EN 880460 894181
1 Rear panel sticker, FR 880461 894181

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1 Rear panel sticker set, All Airway Modules 894181 8000246

2 Rear panel for airway modules 883258
3 Airway module case 878864 893258
3 Airway module case 878864 898318
3 Airway module case, white 893258 898318
3 Case, Airway Module, S/5 white 898318
4 Fan, AM/CCM 880049
6 ACX-200 measuring board 880270
7 Top protection cover 878859
8 Flow cassette latch 880343
9 Magnetic valve, without port plug 58534
10 Magnetic valve, without port plug 58534
11 Internal sampling tubings incl.system plate 880375
12 CO2 Absorber, Airway Module 880067
13 Damping chamber / Filter 880068
14 Gas mother board 880352 885174
14 Gas mother board 881775 885174
14 Gas mother board, Airway Module 885174
17 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 898624
17 Front Panel sticker, blanco (small) ; G-AiO(V), (M-C(O),M-CAiO rev.00-01) 880471 8000204
17 Front Panel sticker (small) ; G-AIO (rev.05), G-AiOV (rev.04) ; S/5 8000204
17 Front Panel sticker (small), DA ; G-AO (rev.04-5), G-AOV (rev.02-03) 892221 8000202
17 Front Panel sticker (small), DA ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000202
17 Front Panel sticker (small), DE ; G-AO (rev.04-05), G-AOV (rev.00-03) 880546 8000193
17 Front Panel sticker (small), DE ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000193
17 Front Panel sticker (small), EN ; G-AO (rev.04-05), G-AOV (rev.00-03) 880376 8000192
17 Front Panel sticker (small), EN ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000192
17 Front Panel sticker (small), ES ; G-AO (rev.04-05), G-AOV (rev.01-03) 884405 8000196
17 Front Panel sticker (small), ES ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000196
17 Front Panel sticker (small), FI ; G-AO (rev.04-05), G-AOV (rev.02-03) 888876 8000199
17 Front Panel sticker (small), FI ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000199
17 Front Panel sticker (small), FR ; G-AO (rev.04-05), G-AOV (rev.00-03) 880454 8000194
17 Front Panel sticker (small), FR ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000194
17 Front Panel sticker (small), IT ; G-AO (rev.04-05), G-AOV (rev.02-03) 886760 8000197
17 Front Panel sticker (small), IT ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000197
17 Front Panel sticker (small), JA ; G-AO, G-AOV ; S/5 8000389
17 Front Panel sticker (small), JA ; G-AO (rev.04-05), G-AOV (rev.02-03) 888313 8000389
17 Front Panel sticker (small), NL ; G-AO (rev.04-05), G-AOV (rev.02-03) 886065 8000195
17 Front Panel sticker (small), NL ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000195
17 Front Panel sticker (small), NO ; G-AO (rev.05), G-AOV (rev.03) 893574 8000201
17 Front Panel sticker (small), NO ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000201
17 Front Panel sticker (small), PT ; G-AO (rev.05), G-AOV (rev.03) 895256 8000198
17 Front Panel sticker (small), PT ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000198
17 Front Panel sticker (small), SV ; G-AO (rev.04-05), G-AOV (rev.02-03) 885843 8000200
17 Front Panel sticker (small), SV ; G-AO (rev.06), G-AOV (rev.04) ; S/5 8000200
18 Front Panel sticker (large) ; G-AiOV (rev.00-01) 881301
18 Front Panel sticker (large) ; G-AiOV (rev.04) ; S/5 8000209
18 Front Panel sticker (large), G-AO (rev.06) ; S/5 8000203
18 Front Panel sticker (large) ; G-AOV (rev.00-01) 881300
18 Front Panel sticker (large) ; G-O (rev.00-01) 885233

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18 Front panel sticker (large) ; G-OV (rev.00-01) 886972

18 Front Panel sticker (large), G-AiO (rev.03-04) 880472 8000205
18 Front Panel sticker (large), G-AIO (rev.05) ; S/5 8000205
18 Front Panel sticker (large), G-AiOV (rev.02) 890710 8000391
18 Front panel sticker (large), G-AiOV (rev.03) 886981 8000209
18 Front Panel sticker (large), G-AO (rev.04-05) 880377 8000203
18 Front Panel sticker (large), G-AOV ; S/5 8000208
18 Front Panel sticker (large), G-AOV (rev.02-03) 886980 8000208
18 Front Panel sticker (large), JA ; G-AiOV ; S/5 8000391
18 Front Panel sticker (large), JA ; G-AOV (rev.02-03) 888314 8000390
18 Front Panel sticker (large), JA ; G-AOV (rev.04) ; S/5 8000390
18 Front Panel sticker (large), JA ; G-OV 890712
19 Tube connector plug 880294
20 Front panel unit 881116 887477
20 Front panel unit 881116 888292
20 Front panel unit 885280 887477
20 Front panel unit (G-AO rev. 01, G- AO rev.02 & G-AOV rev. 00) 880374 887477
20 Front panel unit (G-AO rev. 01, G- AO rev.02 & G-AOV rev. 00) 880374 888292
20 Front panel unit with SSS-connectors 888292
20 Front panel unit w/o SSS-connectors 887477
21 Lamp, ASX-100/200 878756
22 ASX-100 AA ID unit 881107
22 ASX-200 AA ID unit 882718
23 O2 measuring unit 872898 888511
23 O2 measuring unit, complete 888511
24 Inlet ring,8x12x1.5mm 65094
25 Pump, Airway Module 881298 896238
25 Sample Pump Spare Part Kit (G-Axxxx) 896238
26 ACX-200 measuring unit 879849
27 Sample out connector 871981
28 PVX-100 without software 881444
29 PVX tubings 882723
29 PVX tubings 885867
30 PVX board support 880435
31 Cross recess screw M6x16 61678
32 Bushing, Airway Module 879512
33 Bronze Plate 884117
34 Insulating plate for 884116 879914
35 EMC cover, Gas Mother Board 884116
36 Grounding Spring 885602
37 Repair set for spirometry,Airway Mod 886978
38 Spirometry connector,short male 886636
39 Spirometry connector,short female 886638
40 Fitting plate,G-AiO/G-AiOV/G-O/G-OV 880550

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1)
NOTE: In case only the plastic spirometry connectors need repair, or compatibility with adult &
pediatric Patient Spirometry accessories is needed, the Repair set for spirometry connectors,
order number 886978, is recommended.
The Front panel unit, order number 888292, does not contain a membrane keypad, fitting plate
and small front panel sticker. Those should be added separately according to the Airway module
type and revision.
The Flow cassette’s and their order numbers can be found listed in the section Gas sampling
system.

6.1.2 Planned Maintenance (PM) Kits:

Airway Module, G-xxx Order No.
all versions 8001762

6.1.3 Gas Interface Board, B-GAS

Item Item description Order No.
- Fuse T4A 250V *51134
- Grounding plate 885404
- Block screw for cables 546096

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7 EARLIER REVISIONS
This manual supports all the other Airway Module revisions except the following ones. For further
information on those revisions see corresponding manual.

Revision Manual slot/main manual Note

G-AO Module revision 01 Service Manual p/n 880850
G-AiO Module revision 00
G-AO Module revision 02 Service Manual p/n 882580
G-AiO Modules revision 01
G-AOV Module revision 01
G-AiOV Module revision 01
G-OV Module revision 01 Technical Reference Manual 885944-6/896624
G-O Module revision 01

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APPENDIX A

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SERVICE CHECK FORM

S/5 Airway modules

Customer

Service Module type S/N

Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules
OK N.A. Fail OK N.A. Fail
1. Internal parts 2. External parts

3. D-fend O-rings 4. OM ref. filter

Notes

5. Fan

6. Module software Gas Unit

ACX
PVX
ASX

7. Module bus 8. Membrane key

communication
9. N2O calibration zero < 61000

10. Ambient pressure 11. Special tubes

12. CO2 absorber >3

13. Zero valve 14. Leak test

15. Sampling pump > 109 mmHg

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16. Flow rates

Sampling flow 180-220 ml/min
Side flow 10-27 ml/min
O2 meas. in flow 45-60 ml/min
O2 ref. in flow 25-42 ml/min
CO2 absorber flow 180-220 ml/min

17. Pressures
Amb-Work 50-75 mmHg
OM (in-ref) > 4 mmHg

18. O2 sensor output voltage min. 2800 mV

OK N.A. Fail

19. Gas calibration

20. Fall time measurement

CO2 fall time < 360 ms
O2 fall time < 480 ms
N2O fall time < 360 ms
AA fall time < 520 ms

21. Noise measurement

CO2 noise < 20
O2 noise < 100
N2O noise < 150
AA noise < 20

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AA ID option

22. ACX_ASX Delay 400-800 ms

23. AA ID Peak normal and Peak mirror

Peak normal 10.30-10.70
Difference ±0.30

OK N.A. Fail OK N.A. Fail

24. Calibration gas I.D.

Notes

Patient spirometry option

25. Spirometry connectors 26. Spirometry leak test

26. Flow waveform 27. Spirometry tester

Notes

All modules
29. Fan filter 30. Electrical safety
check
30. Occlusion detection 31. Air leak detection

31. Apnea detection 32. Final cleaning

Notes

Used spare parts

Signature

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