ST 2000

Pressure Transmitter
Operator Manual
Doc. No.: 34-ST-11-21
Issue: 2.1
Last Revision Date: 03/04

_________________________________________________________________________________________________________
Industrial Measurement and Control
 Notices and Trademarks

Copyright 2003 by Honeywell International Inc.

Release 2 (03/04)

Warranty/Remedy
Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship. Contact
your local sales office for warranty information. If warranted goods are returned to Honeywell during the period of
coverage, Honeywell will repair or replace without charge those items it finds defective. The foregoing is Buyer's sole
remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and
fitness for a particular purpose. Specifications may change without notice. The information we supply is believed
to be accurate and reliable as of this printing. However, we assume no responsibility for its use.
While we provide application assistance personally, through our literature and the Honeywell web site, it is up to the
customer to determine the suitability of the product in the application.

Industrial Measurement & Control

Honeywell
1100 Virginia Drive
Fort Washington, PA 19034

Honeywell is a U.S. registered trademark of Honeywell

Other brand or product names are trademarks of their respective owners.

ii 34-ST-11-21 3/04
 About This Document

Revision Notes
The following list provides notes concerning all revisions of this document.

Doc ID Rel ID Date Notes

st
34-ST-11-21 Issue 1 04/03 1 issue of document.
Issue 2 03/04 Corrections under Intrinsic Safety Approval, Electromagnetic
compatibility, and Intrinsic safety Barriers;
Includes Addendum 34-ST-99-33, regarding applicability of ATEX
Directive 94/6/EC.

Contacts
World Wide Web
The following lists Honeywell’s World Wide Web sites that will be of interest to our industrial automation and
control customers.

Honeywell Organization WWW Address (URL/e-mail)

Corporate http://www.honeywell.com
Industrial Measurement and Control http://content.honeywell.com/imc/
International http://www.honeywell.com/Business/global.asp
Field Instruments http://www.field-measurement.com
Technical Assistance Center ACE@Honeywell.com (e-mail)

Telephone
Contact us by telephone at the numbers listed below.

Organization Phone Number

United States and Canada Honeywell Inc. 1-800-343-0228 Sales
Industrial Automation and Control 1-800-525-7439 Service
Technical Assistance Center 1-800-423-9883
Solution Support Center 1-602-313-3578
Asia Pacific Honeywell Asia Pacific Inc. (852) 8298298
Hong Kong
Europe Honeywell PACE [32-2] 728-2111
Brussels, Belgium
Latin America Honeywell Inc. (305) 364-2355
Sunrise, Florida U.S.A.

3/04 34-ST-11-21 iii

Symbol definitions
The following table lists those symbols used in this document to denote certain conditions.

Symbol Definition

This CAUTION symbol on the equipment refers the user to the Product Manual for
additional information. This symbol appears next to required information in the manual.

This WARNING symbol on the equipment refers the user to the Product Manual for
additional information. This symbol appears next to required information in the manual.

WARNING: risk of electrical shock. This symbol warns the user of a potential shock
hazard where HAZARDOUS LIVE voltages greater than 30 Vrms, 42.4 Vpeak, or 60
VDC may be accessible.

ATTENTION, Electrostatic Discharge (ESD) hazards. Observe precautions for

handling electrostatic sensitive devices

Protective Earth (PE) terminal. Provided for connection of the protective earth (green
or green/yellow) supply system conductor.

Functional earth terminal. Used for non-safety purposes such as noise immunity
improvement. NOTE: This connection shall be bonded to protective earth at the
source of supply in accordance with national local electrical code requirements.

Earth Ground. Functional earth connection. NOTE: This connection shall be bonded to
Protective earth at the source of supply in accordance with national and local electrical
code requirements.

Chassis Ground. Identifies a connection to the chassis or frame of the equipment shall
be bonded to Protective Earth at the source of supply in accordance with national and
local electrical code requirements.

iv 34-ST-11-21 3/04
 Contents

1. Overview ............................................................................................................... 1
1.1..General.........................................................................................................................................1
1.2 Models ..........................................................................................................................................1

2. Technical Specifications........................................................................................ 3
2.1 Environmental Conditions ............................................................................................................3
2.2 Performance In Operating Range ................................................................................................3
2.3 Functional Specifications..............................................................................................................3
2.4 Physical Specifications.................................................................................................................3
2.5 Intrinsic Safety Approval...............................................................................................................6
2.6 Electromagnetic Compatibility ......................................................................................................6

3. Theory of Operation .............................................................................................. 7

3.1 Basic Operation ............................................................................................................................7
3.2 Transmitter Output Levels ............................................................................................................7
3.3 Intrinsic Safety Barriers ................................................................................................................7

4. Bench Check Installation And Commissioning ...................................................... 9

4.1 Unpacking.....................................................................................................................................9
4.2 Instrument Identification ...............................................................................................................9
4.3 INSTALLATION ..........................................................................................................................10
Transmitter Mounting .....................................................................................................................10
Transmitter Wiring..........................................................................................................................10
Power supply .................................................................................................................................11

5. Configuration ....................................................................................................... 13
5.1 Display and Push Buttons ..........................................................................................................13
5.2 Configuration Of The Display .....................................................................................................13
5.3 Configuration Of The Device - Use Of Functions.......................................................................14
FUNCTION 1: Allows the storage of the configuration in the Non Volatile Memory .....................14
FUNCTION 2: Low Range Value (LRV) and Upper Range Value (URV) display only .................14
FUNCTION 3: Allows to change the LRV without changing URV (span will be modified) ............14
FUNCTION 5: Allows to display and modify the damping filter .....................................................15
FUNCTION 6: Allows to configure and calibrate URV or LRV using the input pressures (span
unchanged) ....................................................................................................................15
FUNCTION 8: Allows to calibrate the zero pressure value of the instrument ...............................16
FUNCTION 9: Allows to choose the engineering units PSI or bar ................................................16

3/04 34-ST-11-21 v
6. Maintenance/Troubleshooting ............................................................................. 19
6.1 Maintenance ...............................................................................................................................19
6.2 Troubleshooting..........................................................................................................................19
Connections ...................................................................................................................................19
External load ..................................................................................................................................19
Power supply .................................................................................................................................19

Tables
Table 1 Transmitter Models..........................................................................................................................................1
Table 2 Environmental Conditions ...............................................................................................................................3

Figures
Figure 1.... 4
Figure 2 Flush connections...........................................................................................................................................5
Figure 3 Tri-clamp connection .....................................................................................................................................5
Figure 4 Sanitary connection ........................................................................................................................................5
Figure 5.... 6
Figure 6.... 6
Figure 7.... 6
Figure 8 Functional Block Diagram .............................................................................................................................7
Figure 9 Output levels ..................................................................................................................................................7
Figure 10 Housing, Covers removed ............................................................................................................................9
Figure 11 Pressure measurement for liquid ................................................................................................................10
Figure 12 Pressure measurement for gas ....................................................................................................................10
Figure 13 Typical Wiring Connections ......................................................................................................................10
Figure 14 Operating Area ...........................................................................................................................................11

Addenda
Addendum 34-ST-99-33 - ATEX Directive 94/6/EC (8 pages)

vi 34-ST-11-21 3/04
 1. Overview
1.1..General
The Series ST 2000 Pressure Transmitter is a microprocessor-based unit. This instrument is 2-wire loop-
powered and gives a 4-20 mA output linearized to pressure.
This transmitter measures and locally displays gauge pressure from 0.2 to 460 bar (3 to 6700 psi) or absolute
pressure from 0.2 to 11.5 bar (3 to 165 psi). For greater absolute pressure measurements than 11.5 bar (165 psi)
use the appropriate gauge pressure model. The effects of process temperature are compensated and software
linearization is included.
Parameters can be adjusted digitally. The 4 digits LCD indicator displays the measured reading either in
engineering units or percentage.
1.2 Models
Table 1 Transmitter Models

GAUGE °
NOMINAL RANGE LIMITS SPAN OVERPRESSURE
Model # Bar/(psi) (min./max.) bar/(psi) (min./max.) bar/(psi) Max. bar/(psi)
STG20F 0-2/(0-30) -1 to 2.3/(-14.5 to 33) 0.2 to 3.3/(3 to 47) 7/(100)
STG20G 0-5/(0-70) -1 to 5.75/(-14.5 to 83) 0.5 to 6.75/(7 to 98) 12/(174)
STG20H 0-10/(0-145) -1 to 11.5/(-14.5 to 166) 1 to 12.5/(14.5 to 181) 25/(362)
STG20K 0-20/(0-300) -1 to 23/(-14.5 to 333) 2 to 24/(30 to 348) 50/(725)
STG20L 0-50/(0-725) -1 to 57.5/(-14.5 to 833) 5 to 58.5/(72.5 to 848) 120/(1740)
STG20M 0-100/(0-1450) -1 to 115/(-14.5 to 1667) 10 to 116/(145 to 1682) 250/(3620)
STG20N 0-200/(0-2900) -1 to 230/(-14.5 to 3335) 20 to 231/(290 to 3350) 500/(7250)
STG20P 0-400/(0-5800) -1 to 460/(-14.5 to 6671) 40 to 461/(580 to 6686) 600/(8700)
ABSOLUTE °
NOMINAL RANGE LIMITS SPAN OVERPRESSURE
Model # Bar/(psi) (min./max.) bar/(psi) (min./max.) bar/(psi) Max. bar/(psi)
STA201 0-2/(0-30) 0 to 2.3/(0 to 33) 0.2 to 2.3/(3 to 33) 7/(100)
STA202 0-5/(0-70) 0 to 5.75/(0 to 83) 0.5 to 5.75/(7 to 83) 12/(174)
STA203 0-10/(0-145) 0 to 11.5/(0 to 165) 1 to 11.5/(14.5 to 165) 25/(362)

EXAMPLE: STG20H
This transmitter displays gauge pressure.
Its nominal sensor range is 0-10 bar (0-145 psi).
The minimum LRV value is –1 bar (-14.5 psi).
The maximum URV value is 11.5 bar (165 psi).
The minimum span value is 1 bar (14.5 psi).
The maximum span value is 12.5 bar (181 psi).
The maximum permitted overpressure is 25 bar (362 psi).

3/04 34-ST-11-21 1
2 34-ST-11-21 3/04
 2. Technical Specifications
2.1 Environmental Conditions
Table 2 Environmental Conditions
Process fluid Process fluid
Reference Operating limits standard connections with flush Storage
connections diaphragm seals
Temperature 23°C -20/+80°C -20/+80°C -20/+130°C -20/+90°C
73.4°F -4/+176 °F -4/+176°F -4/+266°F -4/+194°F
Humidity (%RH) 0/100
Supply Voltage (VDC) 24 11.1/30
(Resistive load = 576 Ω)

2.2 Performance In Operating Range

Performance specifications are given at ambient temperature (23°C/73.4°F) and nominal range. All errors are given as
percentages of nominal range.
Output accuracy: ± 0.2 % of calibrated span or URL, whichever is greater. (Including non linearity, repeatability,
hysteresis)
Thermal drift: referred to 0/60°C (32°F/140°F) range as percentage of the nominal range
Zero: ± 0.2 %/10°C (50°F)
Span: ± 0.2 %/10°C (50°F) at nominal range
LCD display reading: operating between –10 and +65°C (14°F and 149°F)
4 digits LCD display, 5 symbols (bar, mbar, PSI, %, sec)
Power supply effect: negligible between 11.1 and 30 VDC
2.3 Functional Specifications
Output: 2 wire 4–20 mA
Extended working range: 3.8–20.8 mA
Extreme output limits: <3.6 mA and > 21.8 mA
Load Resistance Limits: 0 to 844 ohms as shown in Figure 14 Operating Area.

2.4 Physical Specifications

Material Housing: Die cast aluminum alloy AL UNI 4514 finished with epoxy resin powder (light beige).
Covers: Aluminum
Covers O-ring: Buna N
Identification tags: SS permanently mounted on the instrument.
Wetted parts: alumina (aluminum oxide), AISI 316, Viton/kalrez.
Environmental The transmitter is dust and sand tight and protected against water penetration as defined by
protection IEC IP 66 – Suitable for tropical climate operation as defined in DIN 50.015.

3/04 34-ST-11-21 3
Process 1/2 ANSI B2.1 (NPT-F) Alum. Ox. (Figure 5)
connections 1/2'' ANSI B2.1 (NPT-F) AISI 316 (Figure 6)
1/2'' ANSI B2.1 (NPT-M) AISI 316 (Figure 7)
G1/2 UNI/ISO 228/l Alum. Ox. (Figure 1)
1/2 ANSI B2.1 (NPT-M) Alum. Ox. (Figure 1)
G1/2 UNI/ISO 228/l AISI 316 (Figure 2 Flush connections)
G1 UNI/ISO 228/l AISI 316 (Figure 2 Flush connections)
Union nut (65×1/6) AISI 316 (Figure 4 Sanitary connection)
Union nut (78×1/6) AISI 316 (Figure 4 Sanitary connection)
Clamp (1 ½'') AISI 316 (Figure 3 Tri-clamp connection)
Clamp (2'') AISI 316 (Figure 3 Tri-clamp connection)
Electrical Two cable entries on electronic housing 1/2'' NPT and cable gland PG 13.5 for 7 to 12 mm
connections diameter cable.
Terminal Standard: two terminals for signal wiring up to 1.5 mm2 – 14 AWG. Earth connection for shield of
board cable.
Mounting Direct on pressure connection or with optional mounting bracket
Net weight 0.85 Kg ( 1.87 Ibs)

1/2" NPT
Nameplate
120
110 * 80
7 Min.

12 Max.

72

140

CH.
24
SW.

CH.
20 27
SW.

G1/2" or
1/2" NPT Conversion: 100 mm = 3.94 inch

* 100 mm Clearance to remove cover (both ends)

Figure 1

4 34-ST-11-21 3/04
 DIMENSIONS:
Conversion: 100 mm = 3.94 inch

170 175

G1/2 G1
Figure 2 Flush connections

165 165

1 1/2" or
THR. 65x1/6 DIN 11850-52 or
2"
Not included with the transmitter THR. 78x1/6 DIN 11850-52

Figure 3 Tri-clamp connection Figure 4 Sanitary connection

3/04 34-ST-11-21 5
 110 110

Ø 72
Ø 72

150
190

CH.
27
SW. CH.
32
SW.
1/2" NPT f.
1/2" NPT f.

Figure 5 Figure 6

110 Conversion: 100 mm = 3.94 inch

Ø 72

170

CH.
32
SW.

1/2" NPT

Figure 7

2.5 Intrinsic Safety Approval

Classification
Type: intrinsic safety CESI 04 ATEX 039 II 1G, EEx ia IIB T6, T5, T4 to EN 50.014 and EN 50.020
suitable for Zone 0 Groups IIA, IIB.
Certification: Refer to Addendum 34-ST-99-33 at the end of this Operator Manual.
Ambient temperature ranges T6: -20 to 40°C (-4°F to 104°F)
T5: -20 to 55°C (-4°F to 131°F)
T4: -20 to 80°C (-4°F to 176°F)
2.6 Electromagnetic Compatibility
In conformity with the EMC Directive 89/336/EEC according to EN 61326-1-1997.

6 34-ST-11-21 3/04
 3. Theory of Operation
3.1 Basic Operation
The functional block diagram of the transmitter is shown in the figure below:
Current
Source EEprom

+
Output
A/D Micro- D/A
Pressure/Temperature 4-20 mA
Converter controller Converter
Sensors _

Voltage reference
Connector

Display LCD

Figure 8 Functional Block Diagram

Inputs are sampled and digitized by the "analog to digital" converter (ADC). The sensor signal integrity is checked
by a diagnostic routine. Digital data is linearised and converted to the selected engineering units e.g. bar. The
measurement is then ranged to the lower and upper range values. This value is finally converted to a 4-20 mA
analog output signal. The configuration is held in a non volatile memory (not lost in case of power failure).
The transmitter configuration can be changed by using several functions through the push buttons on the LCD
display.
The transmitter continuously performs internal diagnostics to give maximum reliability and help the user to
identify any problems. Any critical condition will drive the output to the selected failsafe direction (Hi/Lo).
3.2 Transmitter Output Levels
Lower Upper
Failsafe Low Under Over Failsafe High
Range Range
(Downscale) Range Range (Upscale)
Value Value

-2.5% -1.25% 0% 100% 105% 111.25%

(≤3.6 mA) (3.8 mA) (4 mA) (20 mA) (20.8 mA) (≥21.8 mA)

Normal Operating Range

Extended Operating Range

Extreme Output Limits

Figure 9 Output levels

3.3 Intrinsic Safety Barriers

For use in hazardous area, the construction of transmitters series ST 2000 are in accordance with the Certificate
listed in Addendum 34-ST-99-33 (near the back of this manual), intrinsically safe, EEx ia IIB T6, T5, T4.
Safety barriers are required on power supplies between the safe location and the hazardous location.
The transmitter intrinsic safety entity parameters are 30 V and 152 mA. Suitable safety barriers should limit the
available energy to lower values than these (e.g. 28 V/93 mA), and are available from all suppliers of safety barriers
(e.g. MTL, PEPPERL+FUCHS, STAHL, ABB, etc).
Full details of the transmitter certified parameters are: Vi = 30 V ; Ii = 152 mA ; Pi = 0.95 W ;
Ci = 10 nF ; Li = 135 µH

3/04 34-ST-11-21 7
8 34-ST-11-21 3/04
 4. Bench Check Installation And Commissioning
4.1 Unpacking
Unpack the unit and verify the contents are as ordered:
the ST2000 transmitter,
one plug ½’’ NPT and one ½’’ NPT cable gland,
one Allen wrench (used to adjust the orientation of the head of the transmitter if needed)

During the delivery, the transmitter head is not locked in order to allow an optimum positioning
for the mounting.

4.2 Instrument Identification

Instrument data can be found on the nameplate fixed to the top of the transmitter housing. (Model, Serial number,
Tag, Calibration, Nominal Range, …). A facsimile of this nameplate is included in Addendum 34-ST-99-33.

The Figure 10 shows both sides of the housing with covers removed.

Power supply side Electronic module side

23
+-

LEFT RIGHT
BUTTON BUTTON
+ +
POWER
RECEIVER
SUPPLY

- -
Figure 10 Housing, Covers removed

3/04 34-ST-11-21 9
4.3 INSTALLATION

Transmitter Mounting
The transmitter is supplied for direct mounting or with a mounting bracket when it is equipped with remote seal and
capillary tubing.
The bracket may be used in any case (supplied on request) for fixing to a DN50 pipe, horizontal or vertical or used for
surface mounting. Refer to dimensional drawing for details and clearances.
The housing position does not affect the instrument operation. Figure 11 and Figure 12 show the simplest mounting,
direct on piping.

When you have finished the mounting, do not forget to lock the transmitter head
positioning screw.

LIQUID

GAS

Figure 11 Pressure measurement for Figure 12 Pressure measurement for gas

liquid

Transmitter Wiring
Remove the cover of terminal compartment for access to terminals +, -, and ground (earth).
Insert the power supply cable through one of the two 1/2'' NPT openings. In the case of reversed polarity the
instrument will not be damaged. See Figure 13 for a typical connection.
A 2-core cable (section 0.5 mm2 or greater) may be used for connection. Twisted wires are better protected from
electrical noise. Some applications may require shielded cables, earth the shield at the power supply ground only. Avoid
locating cables near AC power cables such as main supplies.
Connect the earth screw to a ground, preferably the same ground used in the measuring circuit. Cabling may be up to 3
km long. Reinstall the removed cover.

-
POWER
SUPPLY

2
+- INTRINSIC SAFETY BARRIER
+
3

CONTROLLER or
INDICATOR
- + - RECORDER
+
Figure 13 Typical Wiring Connections

10 34-ST-11-21 3/04
Power supply
To guarantee a 4 to 22.4 mA output signal, the minimum supply voltage must be checked. It is a function of the total
resistive load (output load). This value is the sum of the resistance of each component in the circuit, excluding the
transmitter. See Figure 14 for minimum supply voltage required.
The value can also be obtained from the following formula:
V = 0.0224×R + 11.1 where R = output load
For a total circuit resistance of 576 Ohms, the minimum supply voltage must be 24 VDC.
The power unit must be able to provide a minimum current of 25 mA for standard operation of the current loop.

Ohm

Output Load
844

Operating
Area
576

250

0 V
11.1 16.7 24 30

Figure 14 Operating Area

3/04 34-ST-11-21 11
12 34-ST-11-21 3/04
 5. Configuration
5.1 Display and Push Buttons
When you power up the instrument, it will show a pre-established sequence for about 6 seconds. This procedure allows
the display of the software revision, test of the LCD segments, internal diagnostics, etc.
After initialization, the display shows the primary variable (pressure).
The push buttons combinations are referenced as follows:
LB Ö Left Button
RB Ö Right Button
LB+RB Ö Both buttons are pushed at the same time
LB or RB Ö One of the two buttons
LB&RB Ö First press LB, while LB is pressed, press RB
RB&LB Ö First press RB, while RB is pressed, press LB

5.2 Configuration Of The Display

The display parameters that can be configured are:

GROUP 1: Pressure unit configuration

bar (automatically to mbar if value low) or
PSI depending on the selected engineering unit (see function F9)
% relative to the span set by the user (LRV/URV).
You can also configure the display to alternate between two measurements units:
Automatic switching between [bar or PSI] and %
Automatic switching between [bar or PSI] and °C (where °C is the sensor temperature)

GROUP 2: Temperature or pressure

Temperature of the sensor expressed in °C
Pressure expressed as % of the sensor normal measuring range (LRL/URL)
Numerical value of the analog to digital converter.

To select the desired configuration:

First rotate by pressing LB as many times as necessary to reach the desired unit, then release LB.
To change from Group 1 to Group 2, push LB followed by RB (LB&RB).
To activate/inactivate the alternate display of [bar <-> %] or [PSI <-> %], enter in Group 1, hold LB for about 2
seconds.
To activate/inactivate the alternate display of [bar <-> °C] or [PSI <-> °C], enter in Group 1, hold RB for about 2
seconds.

Example
If you want to read the pressure as a % of the sensor nominal range (LRL/URL):
1. Select group 2 by LB&RB.
2. Press LB as many times as necessary to read the pressure as a % of the sensor nominal range, then release.

If you want to read the pressure in bar:

1. Go back to group 1 by LB&RB.
2. Press LB as many times as necessary to read the pressure value with the symbol “bar”, then release.

3/04 34-ST-11-21 13
5.3 Configuration Of The Device - Use Of Functions
The device configuration functions are:
F1 Ö Save configuration in Non Volatile Memory
F2 Ö Display of LRV and URV
F3 Ö Low Range Value
F4 Ö Upper Range Value
F5 Ö Damping
F6 Ö Configure and calibrate LRV/URV from input pressures (span unchanged)
F7 Ö Configure and calibrate LRV/URV from input pressures (span modified)
F8 Ö Calibrate zero pressure reference
F9 Ö Engineering unit (bar/PSI)
F10 Ö Failsafe direction

To scroll functions, keep the LB+RB pushed until you reach the desired function.
When the required function appears on the display, the buttons have to be released to remain in that state.
Functions can be executed according to the procedure described in the following paragraphs.
A time out is implemented and therefore, if no action is taken after 3 seconds, the device returns to the normal display.

FUNCTION 1: Allows the storage of the configuration in the Non Volatile Memory
Press LB+RB Ö to select F1, then release
Press LB Ö A short message will appear (Ld) to confirm that your configuration has been
loaded in the Non Volatile Memory.
After this message, the system returns to the normal display and your configuration has been saved.

FUNCTION 2: Low Range Value (LRV) and Upper Range Value (URV) display only
With this function you can read LRV and URV but you cannot change them. (See functions 3 and 4 for
any change.)
Press LB+RB Ö until you reach F2, then release
Press LB Ö Display LRV
Press LB&RB Ö Display LRV as % of the sensor nominal range
Press RB Ö Display URV
Press RB&LB Ö Display URV as % of the sensor nominal range

FUNCTION 3: Allows to change the LRV without changing URV (span will be modified)
Press LB+RB Ö until you reach F3, then release
Press LB or RB Ö Display LRV
Press RB Ö Increase until you reach the desired value
Press LB Ö Decrease until you reach the desired value
Press RB+LB Ö Store the value in Volatile Memory
After the confirmation LB+RB, the message “Ld” will appear to confirm that your modification has been
loaded in the Volatile Memory. After this message, the system returns to the normal display.
NOTE: The minimum span you are allowed to set without changing URV is 10 % of the sensor nominal
range.
Remember to store the new values in the Non Volatile Memory through the F1 function;
otherwise the data will get lost after switching off the instrument.

14 34-ST-11-21 3/04
FUNCTION 4: Allows to change the URV without changing LRV (span will be modified)
Press LB+RB Ö until you reach F4, then release
Press LB or RB Ö Display URV
Press RB Ö Increase until you reach the desired value
Press LB Ö Decrease until you reach the desired value
Press RB+LB Ö Store the value in Volatile Memory
After the confirmation LB+RB, the message “Ld” will appear to confirm that your modification has been
loaded in the Volatile Memory. After this message, the system returns to the normal display.
NOTE: The minimum span you are allowed to set without changing LRV is 10 % of the sensor nominal
range.
Remember to store the new values in the Non Volatile Memory through the F1 function;
otherwise the data will get lost after switching off the instrument.

FUNCTION 5: Allows to display and modify the damping filter

Press LB+RB Ö until you reach F5, then release
Press LB or RB Ö Display the filter value
Press RB Ö Increase until you reach the desired filter value
Press LB Ö Decrease until you reach the desired filter value
Press RB+LB Ö Store the value in Volatile Memory
After the confirmation LB+RB, the message “Ld” will appear to confirm that your modification has been
loaded in the Volatile Memory. After this message, the system returns to the normal display.
NOTE:
The filter value you are allowed to set is between 1 second and 51 seconds.
If the filter value is not equal to zero, the "sec." symbol will appear in normal display.
Remember to store the new values in the Non Volatile Memory through the F1 function;
otherwise the data will get lost after switching off the instrument.

FUNCTION 6: Allows to configure and calibrate URV or LRV using the input pressures (span unchanged)
Press LB+RB Ö until you reach F6, then release
Ö Apply LRV pressure
Press LB Ö Display the applied pressure value
Press LB&RB Ö Set LRV (4 mA) to the displayed pressure value
Ö Apply URV pressure
Press RB Ö Display the applied pressure value
Press RB&LB Ö Set URV (20 mA) to the displayed pressure value
The new LRV is accepted only if:
Pressure value < 105 % of the sensor nominal range
Pressure value + span < 115 % of sensor nominal range
The new URV is accepted only if:
Pressure value < 115 % of the sensor nominal range
Pressure value – span > -1 bar
When the above mentioned conditions are met, the message “Ld” will appear to confirm that your
modification has been loaded in the Volatile Memory. After this message, the system returns to the
normal display. If the message “Ld” does not appear, the first step of F6 is displayed again.
NOTE: The minimum span you are allowed to set is equal to 10 % of the sensor nominal range.
Remember to store the new values in the Non Volatile Memory though the F1 function;
otherwise the data will get lost after switching off the instrument.

3/04 34-ST-11-21 15
FUNCTION 7: Allows to configure and calibrate URV or LRV using the input pressures (span
modified)
Press LB+RB Ö until you reach F7, then release
Ö Apply LRV pressure
Press LB Ö Display the applied pressure value
Press LB&RB Ö Set LRV (4 mA) to the displayed pressure value
Ö Apply URV pressure
Press RB Ö Display the applied pressure value
Press RB&LB Ö Set URV (20 mA) to the displayed pressure value
The new LRV is accepted only if:
Pressure value < 105 % of the sensor nominal range
Pressure value > -1 bar
The new URV is accepted only if:
Pressure value < 115 % of the sensor nominal range
Pressure value > -1 bar + 10 % of sensor nominal range
When the above mentioned conditions are met, the message “Ld” will appear to confirm that your
modification has been loaded in the Volatile Memory. After this message, the system returns to the
normal display. If the message “Ld” does not appear, the first step of F7 is displayed again.
Only when the condition Pressure value > -1 bar is not met, the transmitter will change the span to have
a span value equal to 10 % of the sensor nominal range.
Remember to store the new values in the Non Volatile Memory though the F1 function otherwise
the data will get lost after switching off the instrument.

FUNCTION 8: Allows to calibrate the zero pressure value of the instrument

Press LB+RB Ö until you reach F8, then release
Ö Ensure zero pressure applied
Press LB Ö Display the applied pressure value
Press LB&RB Ö Set the primary value to zero
The display will show “0000” value
Release LB Ö “Ld ” is displayed: loaded in the volatile memory
while RB is
still pressed
After the “Ld” message, the system returns to the normal display
Remember to store the new values in the Non Volatile Memory though the F1 function otherwise
the data will get lost after switching off the instrument.

FUNCTION 9: Allows to choose the engineering units PSI or bar

Press LB+RB Ö until you reach F9, then release
Press LB Ö Display the actual engineering unit
Press LB&RB Ö Change the unit (bar <-> PSI)
Press LB Ö Store the engineering unit in volatile memory, then system returns to the normal
display
WARNING:
The time out will confirm the last unit you have selected (same effect as press LB).
If the bar engineering unit has been selected, the symbol “bar” (or mbar) will appear on the display.
If the PSI engineering unit has been selected, the symbol PSI will not appear with the primary value,
but will be displayed alone every ten seconds.
Remember to store the new values in the Non Volatile Memory through the F1 function;
otherwise the data will get lost after switching off the instrument.

16 34-ST-11-21 3/04
FUNCTION 10: Failsafe direction Selection
The transmitter will go to a failsafe direction when it detects a failure. (In that case, the measurement in %
on the display goes to 555.5 %.)
LO: low alarm with a fixed current < 3.6 mA
HI: high alarm with a fixed current > 21.8 mA
Press LB+RB Ö until you reach F10, then release
Press LB Ö Display the actual failsafe direction
Press LB&RB Ö Change the direction (Hi <-> Lo)
Press LB Ö The choice becomes effective, the system returns to the normal display.
WARNING:
The time out will confirm the last direction you have selected (same effect as LB pressed).
Remember to store the new values in the Non Volatile Memory through the F1 function;
otherwise the data will get lost after switching off the instrument.

3/04 34-ST-11-21 17
18 34-ST-11-21 3/04
 6. Maintenance/Troubleshooting
6.1 Maintenance
The transmitter has no moving components and therefore the maintenance operations are related only to the
environmental conditions.
It is suggested to plan a periodic check of the internal parts in the top housing to ensure that no moisture penetration
is present and that the terminals are clean to assure a good electrical continuity (do not use solvents for cleaning).

6.2 Troubleshooting
Verification of correct operation of the transmitter should be based on the instructions discussed in the present
manual.
In absence of an output signal or an output value not corresponding to the real value, the following tests are
suggested:

Connections
The process piping must be installed correctly; unwanted gas or liquid pockets can affect the measured value
and accumulation of dirt and pipe incrustation may cause blocks.
The process isolation valve must be in the open position. Check that wiring is correct (polarity) and in good
condition, both for main supply and shielding.

External load
Supply voltage value is a function of the resistive load; verify this value. (See Figure 14.)

Power supply
The DC voltage must have the correct value and polarity (11.1 – 30 VDC).
Calibration tests: Follow the instruction in chapter 5.

3/04 34-ST-11-21 19
20 34-ST-99-33 (Addendum to 34-ST-11-21) 3/04
 34-ST-99-33
3/04

Addendum
ST 2000 Pressure (to Operator’s Manual
Transmitter 34-ST-11-21)

Overview ATEX Directive 94/6/EC

The ATEX Directive 94/6/EC is a European CE Mark directive concerning products

that are designed for use in potentially explosive environments. This “New
Approach” directive is based on, and is an expansion of, European Norms (EN,
CENELEC standards).
On June 30, 2003, the ATEX (ATmospheres EXplosibles) directive will replace
directives currently in effect, and from that time, only products with the ATEX
certification and with ATEX labeling will be approved for free movement in the 19
EU (European Union) and EFTA (European Free Trade Association) countries. As
defined in the directive, “free movement” refers to:
− placing a product on the market, and/or
− placing a product into service.
The ATEX Directive 94/6/EC is a living (set of) document(s), subject to further
change and refinement, whose details are beyond the scope of this addendum.
Further information can be obtained in the Official Journal of the European
Communities No L100/1, and in related publications such as Guidelines on the
Application of Directive 94/9/EC. Both of these items are available at:
http://europa.eu.int/comm/enterprise/atex/index.htm
Products that have been previously certified under the EN and CENELEC European
Norms, and which comply fully with all standards in the New Approach directive
have, by application, received certification under ATEX Directive 94/6/EC.
The Honeywell ST 2000 Pressure Transmitter is now ATEX certified, and all units
manufactured currently and in the future will include labeling that includes all
markings required under the ATEX directive.
Inclusions To ensure that all required information will be available to the user, the following
items are include with this Addendum for reference:
1. Declaration of Conformity – ATEX CE 0344 (Honeywell document number
51453504 Revision A).

3/04 34-ST-99-33 (Addendum to 34-ST-11-21) 1 of 8

 Purpose and Content This Addendum includes information required under the ATEX Directive regarding:
of this Addendum
1. The appearance and meaning of each certification mark (CE Mark) that appears
on the label(s) affixed to the product.
2. Instructions for installation and use of the product is given in:
34-ST-11-21 – ST 2000 Pressure Transmitter Release Operator’s Manual, of
which this Addendum is a part.
Details regarding certification marks that appear in labeling for this product are given
in this addendum.

Attention
The publications cited above and the functioning and construction (except for
labeling) of the devices described therein are essentially unchanged. The
purpose of this addendum is to provide details on the purpose and
appearance of the labels attached to each device under ATEX
Directive 94/6/EC.

Attention

Before installing the equipment in a potentially explosive atmosphere, please

read the information provided in this Addendum, which supports the ATEX
certifications for this product.

CE Conformity The ST 2000 Pressure Transmitter is in conformity with the protection requirements
of the following European Council Directives: 94/9/EC, the Explosive Atmospheres
(ATEX) Directive, 89/336/EEC, and the Electromagnetic Compatibility (EMC)
Directive.
In conformity with the ATEX directive, the CE mark on the certification nameplate
includes the Notified Body identification number 0344, (KEMA) adjacent to the EC
Type Examination Certificate number.
Deviation from the installation conditions in this manual may invalidate this product’s
conformity with the Explosive Atmospheres, and EMC Directives.
Conformity of this product with any other “CE Mark” Directive(s) shall not be
assumed.

Marking, Honeywell’s Model ST 2000 Pressure Transmitter, with the following nameplate
ATEX Directive attached, has been certified to comply with Directive 94/9/EC of the European
Parliament and the Council as published in the Official Journal of the European
Communities No. L 100/1 on 19-April-1994.

2 of 8 34-ST-99-33 (Addendum to 34-ST-11-21) 3/04

 Marking, The following information is provided as part of the labeling of the transmitter:
ATEX Directive
• Name and address of the distributor: Honeywell, Fort Washington, PA 19034
Continued USA.
• Notified Body for Type Examination Certificate: CESI – 0722, Centro
Elettrotacnico Sperimentale Italiano Glacinto Motta SpA, Via R. Rubattino 54,
20134 Milano – Italia.
• Notified Body for Honeywell Production Quality Assurance Notification: KEMA –
0344, Quality B. V. Utrechtseweg 310, 6812 AR Arnhem. The Netherlands
• For complete model number, see the Model Selection Guide 34-ST-16-57.

Nameplate:
51453502-001 is a representation of the nameplate attached to the ST 2000 Pressure Transmitter.

Specific Field wiring terminals, (+ , –): Ui = 30 V, Ii = 152 mA, Pi = 0.95 W

Parameters for
Intrinsic Safety Ci = 10 nF, Ri = 0, Li = 135 µH

3/04 34-ST-99-33 (Addendum to 34-ST-11-21) 3 of 8

Special conditions for The ST 2000 Pressure Transmitter is an intrinsically safe apparatus that may be
safe use, installed in a Group IIB (Ethylene) potentially explosive atmosphere.
Intrinsic Safety The power terminals (+, -) must be connected only to a certified associated
intrinsically safe apparatus.
The electrical parameters (U, I, and P) of the associated apparatus connected to the
power terminals (+, –) must not exceed the following values:
Ui ≤ 30V Ii ≤ 152 mA Pi ≤ 0.95 W
Ambient temperature: -20ºC to 80ºC
Temperature classifications: T6 Ta = -20 to +40ºC
T5 Ta = -20 to +55ºC
T4 Ta = -20 to +80ºC

Enclosure classification: IP 66

Installation Fitness of the transmitter for the installation area

In case of use in areas with danger of explosion, it must be verified that the identified
type of transmitter is suitable for the classification of the zone and for the presence of
flammable substances in the plant.
The safety essential requisite against the risk of explosion in the classified areas are
fixed from the European Directives 94/9/CE of March 23 rd 1994 (as far as it concerns
the apparatus) and 1999/92/CE of December 16th 1999 (as far as it concerns the plant).
The classification of the areas with risk of explosion is specified in standard EN60079-
10, Electrical Apparatus for Explosive Gas Atmospheres – Part 10, Classification of
hazardous areas.
The technical requirements for electric fittings in the classified areas are given in
standard EN60079-14, Electrical Apparatus for Explosive Gas Atmospheres – Part14,
Electrical installations in hazardous areas (other than mines).
The plate shows the functional data and the references of the notified body for the
certification.

4 of 8 34-ST-99-33 (Addendum to 34-ST-11-21) 3/04

 Transmitter for surface plants with presence of gas or vapours, Group
Safety data II 1 G II, category 1, suitable for zone 0 and with redundancy for zone 1 and
definitions 2.

EEx ia Intrinsically Safe transmitter, category ia.

II B Group IIB apparatus, suitable for substances (gas) of group IIB.

T6, T5, T4 Temperature Class of the transmitter (maximum temperature)

CE Conformity mark to European Directives applicable to the apparatus

Conformity marking to 94/9/CE Directive and technical rules

Ta Ambient temperature

Ui, Ii, Pi,

Maximum Input parameters of the apparatus (related to intrinsic safety)
Ci, Li

Notes: a) Transmitters suitable for the group IIB are also suitable for gas group IIA;
b) Transmitters with temperature class of T6 are also suitable for all substances
with higher temperature classifications (T5, T4, T3, T2, T1);
c) Transmitters with temperature class of T5 are also suitable for all substances
with higher class of temperature (T4, T3, T2, T1);
d) Transmitters with temperature class of T4 are also suitable for all substances
with higher class of temperature (T3, T2, T1);
e) Associated apparatus must be chosen based on the maximum input
parameters of the transmitter.

Additional Warnings Refer to the Operator’s Manual for correct installation.

for Installation
Process pressure and temperature must not exceed the marked Maximum Allowable
Working Pressure (MAWP) or maximum specified process temperature.
When the transmitter is connected to the process it can be subjected to high pressures
and temperatures. To avoid accidents from the sudden discharge of pressure and/or
contact with dangerous or flammable fluids, pay special attention when the transmitter
is taken out of service, heated or repaired. Verify that the transmitter is isolated from
the process and is not affected by pressure and/or temperature before servicing.

3/04 34-ST-99-33 (Addendum to 34-ST-11-21) 5 of 8

 Follow the instructions in the Operator Manual for the electrical connections. For
Electrical
installation in hazardous areas, the transmitter must be connected to associated
Connections
apparatus (e.g. safety barriers), certified according to the standard EN 50020, with
output electrical characteristics compatible with the maximum input parameters (on
the nameplate) of the certified transmitter.

The evaluation of the system connected with the associated apparatus, the transmitter,
and the interconnecting cables must be done only by experienced personnel, and must
match the requirements of EN 50039, Electrical Apparatus for Explosive Gas
Atmospheres – Intrinsically Safe Electrical Systems ‘i’.

For correct installation, it is necessary to follow the safety instructions of the selected
associated apparatus.

Inspection and Inspection and maintenance of the transmitters shall be in accordance with IEC 60079-
Maintenance 17, Electrical Apparatus for Explosive Gas Atmospheres – Part 17: Inspection and
Maintenance of Electrical Installations in Hazardous Areas (Other than Mines).

Instrument Service There are no user repairable components in the ST 2000 transmitter. Contact your
nearest Honeywell representative for service.

6 of 8 34-ST-99-33 (Addendum to 34-ST-11-21) 3/04

 51453504, Revision A

EC DECLARATION OF CONFORMITY
We declare under our sole responsibility that the following products,

ST 2000 Pressure Transmitters (per attached list)

to which this declaration relates, are in conformity with the protection requirements of Council Directive: 94/9/EC
(ATEX Directive) on the approximation of the laws of the Member States concerning equipment and protective systems
intended for use in potentially explosive atmospheres, and 89/336/EEC (EMC Directive) as amended by 92/31/EEC and
93/68/EEC on the approximation of the laws of the Member States relating to Electromagnetic Compatibility.

The models covered by this Declaration are specified in Technical File 51453500, and shown on the attached list.
Conformity to the EMC Directive is in accordance with the following European Standard.

EN 61326-1997 Electrical Equipment for Measurement, Control and Laboratory Use – EMC Requirements
Conformity to the ATEX Directive is in accordance with the following European standards.
EN 50014-1997 Electrical Apparatus for Potentially Explosive Atmospheres - General Requirements
EN 50020-2002 Electrical Apparatus for Potentially Explosive Atmospheres - Intrinsic Safety "i"
EN 50284-1999 Special Requirements for Construction, Test and Marking of Electrical Apparatus of
Equipment Group II, Category 1 G

Notified EC Type Examination Certificates Production Quality Assurance Notification

Bodies: CESI – Elettrotecnico Sperimentale KEMA Quality B. V. – 0344
Italiano Giacinto Motta SpA – 0722 Utrechtseweg 310
Via R. Rubattino 54 6812 AR Arnhem
20134 Milano, Italia The Netherlands

Certificate Protection
CESI 04 ATEX 039 EEx ia IIB T6, Tamb –20 to +40°C
T5, Tamb –20 to +55°C
T4, Tamb –20 to +80°C
The authorized signatory to this declaration, on behalf of the manufacturer, and the Responsible Person is identified
below.

Honeywell International Inc.

Industrial Measurement & Control Frederick M. Kent
1100 Virginia Drive Standards & Approvals Engineer
Fort Washington, PA 19034 USA
Issue Date: 27 February 2004

3/04 34-ST-99-33 (Addendum to 34-ST-11-21) 7 of 8

ST 2000 Pressure Transmitters

Model Description

STA201 Absolute Pressure Transmitter

STA202 Absolute Pressure Transmitter

STA203 Absolute Pressure Transmitter

STG20F Gauge Pressure Transmitter

STG20G Gauge Pressure Transmitter

STG20H Gauge Pressure Transmitter

STG20K Gauge Pressure Transmitter

STG20L Gauge Pressure Transmitter

STG20M Gauge Pressure Transmitter

STG20N Gauge Pressure Transmitter

STG20P Gauge Pressure Transmitter

8 of 8 34-ST-99-33 (Addendum to 34-ST-11-21) 3/04

34-ST-11-21
Industrial Measurement and Control
Honeywell International Inc.
2500 West Union Hills
Phoenix, AZ 85027