Ozone Monitor

2B Technologies, Inc.

OPERATION MANUAL

Models 106-H

© Copyright 2011, 2B Technologies, Inc.

All rights reserved.

Model 106-H Ozone Monitor Manual Rev. C

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TABLE OF CONTENTS

IDENTIFICATION RECORDS iii

PRINTING HISTORY iv
WARRANTY STATEMENT v
WARNINGS vi
OZONE MONITOR INTRODUCTION 1
SPECIFICATIONS 4
OPERATION 5
MENU 8
MAINTENANCE/TROUBLESHOOTING 19
CALIBRATION 22
LABELLED PARTS 25
PARTS LIST 27
SERVICE LOG 28
APPENDIX A: USB INSTALLATION 30
APPENDIX B: USING THE USB CONNECTION 33

Model 106-H Ozone Monitor Manual Rev. C

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IDENTIFICATION RECORDS

Record the following information for future reference:

Unit serial number: ______________________________________

Warranty start date: _______________________________________

(date of receipt)

Model 106-H Ozone Monitor Manual Rev. C

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PRINTING HISTORY

New editions are complete revisions of the manual and incorporate all previous
update pages and write-in instructions. This manual will be revised as
necessary. Revisions can be in the form of new editions, update pages, or
write-in instructions.

Revision A ............................................................................................. April 2010

Revision B ................................................................................... September 2010
Revision C.................................................................................... December 2011

TRADEMARKS & PATENTS

2B Technologies, 2B Tech, 2B and Ozone Monitor are trademarks of 2B

Technologies, Inc.

CONFIDENTIALITY

The information contained in this manual may be confidential and proprietary, and is the
property of 2B Technologies, Inc. Information disclosed herein shall not be used to
manufacture, construct, or otherwise reproduce the goods disclosed herein. The
information disclosed herein shall not be disclosed to others or made public in any
manner without the expressed written consent of 2B Technologies, Inc.

© Copyright 2011, 2B Technologies, Inc.

All rights reserved.

Model 106-H Ozone Monitor Manual Rev. C

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WARRANTY STATEMENT

2B Technologies, Inc. warrants its products against defects in materials and

workmanship. 2B Technologies will, at its option, repair or replace products which
prove to be defective. The warranty set forth is exclusive and no other warranty,
whether written or oral, is expressed or implied. 2B Technologies specifically
disclaims the implied warranties of merchantability and fitness for a particular purpose.

Warranty Periods

The warranty period is one (1) year from date of receipt by the purchaser, but in no
event more than thirteen (13) months from original invoice date from 2B Technologies,
Inc.

Warranty Service

Warranty Service is provided to customers via web ticket, email and phone
support, Monday - Friday, from 9:00 a.m. to 5:00 p.m., Mountain Time USA.
The preferred method of contacting us is through our web ticketing software at:

www.twobtech.com/techsupport

This way all technical staff at 2B Tech will be alerted of your problem and be
able to respond. When you receive an email reply, please click on the Ticket
link provided to continue to communicate with us directly over the internet. The
web ticket approach to customer service allows us to better track your problem
and be certain that you get a timely response. We at 2B Tech pride ourselves
on the excellent customer service we provide.

You may also contact us by email at techsupport@twobtech.com or by phone

at +1(303)273-0559. In either case, a web ticket will be created, and future
communications with you will be through though that ticket.

Initial support involves trouble-shooting and determination of parts to be

shipped from 2B Technologies to the customer in order to return the product to
operation within stated specifications. If such support is not efficient and
effective, the product may be returned to 2B Technologies for repair or
replacement. Prior to returning the product, a Repair Authorization Number
(RA) must be obtained from the 2B Technologies Service Department. We will
provide you with a simple Repair Authorization Form to fill out to return with the
instrument.

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Shipping

2B Technologies will pay freight charges for replacement or repaired products shipped
to the customer site. Customers shall pay freight charges for all products returning to
2B Technologies.

Conditions

The foregoing warranty shall not apply to defects resulting from improper or
inadequate maintenance, adjustment, calibration or operation by customer.
Maintenance, adjustment, calibration or operation must be performed in accordance
with instructions stated in the Ozone Monitor manual. Usage of maintenance
materials purchased from suppliers other than 2B Technologies will void this warranty.

Limitation of Remedies and Liability

The remedies provided herein are the Customer's sole and exclusive remedies. In no
event shall 2B Technologies be liable for direct, indirect, special, incidental or
consequential damages (including loss of profits) whether based on contract, tort or
any other legal theory. The Ozone Monitor manual is believed to be accurate at the
time of publication and no responsibility is taken for any errors that may be present. In
no event shall 2B Technologies be liable for incidental or consequential damages in
connection with or arising from the use of the Ozone Monitor manual and its
accompanying related materials. Warranty is valid only for the country designated on
the 2B Technologies quote or invoice.

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Warnings

ENGLISH ESPAÑOL

WARNING: ATENCION:
Any operation requiring access to the inside of the equipment, could result Cualquier operación que requiera acceso al interior del equipo, puede
in injury. To avoid potentially dangerous shock, disconnect from power causar una lesión. Para evitar peligros potenciales, desconectarlo de la
supply before opening the equipment. alimentación a red antes de abrir el equipo.

WARNING: ATENCION:

This symbol, on the instrument indicates that the user should refer to Este símbolo, en el instrumento indica que el usuario debería
the manual for operating instructions. referirse al manual para instrucciones de funcionamiento.

WARNING: ATENCION:
If this instrument is used in a manner not specified by 2B Technologies, Si este instrumento se usa de una forma no especificada por 2B
Inc. USA, the protection provided by the instrument may be impaired. Technologies, Inc., USA, puede desactivarse la protección suministrada
por el instrumento.

FRANÇAIS DEUTSCH

ATTENTION: WARNHINWEIS:
Chaque opération à l’intérieur de l’appareil, peut causer du préjudice. Afin Vor dem Öffnen des Gerätes Netzstecker ziehen!
d’éviter un shock qui pourrait être dangereux, disconnectez l’appareil du
réseau avant de l’ouvrir.

WARNHINWEIS:

ATTENTION: Dieses, auf dem Gerät weist darauf hin, dab der Anwender zuerst
das entsprechende Kapitel in der Bedienungsanleitung lesen sollte.
Le symbol, indique que l’utilisateur doit consulter le manuel
d’instructions.

WARNHINWEIS:
ATTENTION: Wenn das Gerät nicht wie durch die Firma 2B Technologies, Inc., USA,
Si l’instrument n’est pas utilisé suivant les instructions de 2B Technologies, vorgeschrieben und im Handbuch beschrieben betrieben wird, können
Inc., USA, les dispositions de sécurité de l’appareil ne sont plus valables. die im Gerät eingebauten Schutzvorrichtungen beeinträchtigt werden.

ITALIANO DUTCH

ATTENZIONE: OPGELET:
Qualsiasi intervento debba essere effettuato sullo strumento può essere
potenzialmente pericoloso a causa della corrente elettrica. Iedere handeling binnenin het toestel kan beschadiging veroorzaken.
Il cavo di alimentazione deve essere staccato dallo strumento prima della Om iedere mogelijk gevaarlijke shock te vermijden moet de aansluiting
sua apertura. met het net verbroken worden, vóór het openen van het toestel.

ATTENZIONE:
OPGELET:
Il simbolo, sullo strumento avverte l’utilizzatore di consultare il
Manuale di Istruzioni alla sezione specifica. Het symbool, geeft aan dat de gebruiker de instructies in de
handleiding moet raadplegen.

ATTENZIONE:
Se questo strumento viene utilizzato in maniera non conforme alle OPGELET:
specifiche di 2B Technologies, Inc. USA, le protezioni di cui esso è dotato Indien het toestel niet gebruikt wordt volgens de richtlijnen van 2B
potrebbero essere alterate. Technologies, Inc., USA gelden de veiligheidsvoorzieningen niet meer.

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1. OZONE MONITOR INTRODUCTION

The 2B Technologies Model 106-H Ozone Monitor is designed to enable

accurate measurements of ozone over a wide dynamic range extending from
0.01 percent by weight in oxygen (Wt.% O2) to an upper limit of 20 Wt.% O2
based on the well established technique of absorption of ultraviolet light at 254
nm. The Ozone Monitor is light weight (4.5 lb, 2.0 kg) and has low power
consumption (3.6 watt) relative to conventional instruments and is well suited
for applications such as:

 Monitoring of ozone generator output

 Monitoring of residual ozone after a cleaning or oxidation process
 Control of industrial ozone processes

Theory of Operation

Absorption of UV light has long been used for measurements of ozone with
high precision and accuracy. The ozone molecule has an absorption maximum
at 254 nm, coincident with the principal emission wavelength of a low-pressure
mercury lamp. Fortunately, few molecules found in ozone process streams
absorb at this wavelength.

Figure 1 is a schematic diagram of the Ozone Monitor. Ozone is measured

based on the attenuation of light passing through a 0.1 cm absorption cell fitted
with sapphire windows. A low-pressure mercury lamp is located on one side of
the absorption cell, and a sample photodiode is located on the opposite side of
the absorption cell. The photodiode has a built-in interference filter centered on
254 nm, the principal wavelength of light emitted by the mercury lamp. A
beamsplitter and reference photodiode are used to monitor the lamp intensity
without the sample in the beam path. The intensity of light is measured from
the reference photodiode (Io) and from the sample photodiode (I).

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 Reference
Photodiode

Temperature
Hg Lamp
Sensor Sample
Photodiode
Absorption
Beamsplitter Cell

Pressure Sensor
Pressure Relief
and Scrubber Sample Outlet

Sample Inlet

Figure 1. Schematic Diagram of the Ozone Monitor.

Ozone concentration is calculated from the measurements of Io and I according

to the Beer-Lambert Law:

1  Io 
CO3  ln  
l  I 

where l is the path length (0.1 cm) and  is the absorption cross section for
ozone at 254 nm (1.15 x 10-17 cm2 molecule-1 or 308 atm-1 cm-1), which is
known with an accuracy of approximately 1%. The 2B Technologies instrument
uses the same absorption cross section (extinction coefficient) as used in other
commercial instruments.

When there is no ozone in the cell, a difference in light intensity at the reference
and sample photodiodes can be expected, and it will cause a zero offset in the
readings. This light intensity difference is inherent in the instrument due to the
different properties of the two photodiodes, drift in the angle of the beamsplitter,
contamination in the cell and thermal drift in any of the optical components.
The zero drift has been determined to be less than or equal to 2% of full scale
per month, non-cumulative and can easily be corrected for by using the zero
function described below. The zero drift does not affect the slope calibration
factor in any way, and the instrument does not need to be recalibrated after
performing the zeroing function.

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The pressure and temperature within the absorption cell are measured so that
the ozone concentration can be expressed as a mixing ratio in percent by
volume (vol%). The fraction of the sample that is ozone can then be calculated
and used to determine the ozone concentration in percent by weight in either
air (Wt.% air) or oxygen (Wt.% O2). The instrument displays and records the
cell temperature and pressure in addition to the ozone concentration. The cell
pressure is displayed and logged in units of mbar, torr or psia and the cell
temperature in units of either oC or K.

In principle, the measurement of ozone by UV absorption requires only a zero

calibration to account for the different light intensities at the reference and
sample photodiodes. However, non-linearity of the photodiode response and
electronics can result in a small measurement error. Therefore, each
instrument is compared with a reference ozone monitor calibrated to the
International Ozone Association (IOA) buffered KI method. These results are
used to calibrate the Ozone Monitor with respect to a slope (gain). The
correction for slope is recorded in the instrument Birth Certificate. The slope
parameter is entered into the microprocessor prior to shipment. The user may
change the slope parameter from the front panel if desired. It is recommended
that the instrument be recalibrated at least once every year and preferably
more frequently. The zero may drift due to temperature change or chemical
contamination of the absorption cell. As discussed below, an accurate zero
correction can be measured from time to time using zero gas.

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OZONE MONITOR SPECIFICATIONS

Power Requirements ....... 11-28 V DC, nominally 440 mA at 12 V, 5.3 watt

Dimensions (with case) ............... 3.75” x 8.5” x 8.5” (9.5 x 21.6 x 21.6 cm)

Dimensions (OEM version) .................. 2.5” x 7” x 9” (6.4 x 17.8 x 22.9 cm)

Weight (with case) ................................................................ 4.5 lb (2.0 kg)

Weight (OEM version) .......................................................... 3.0 lb (1.4 kg)

Precision ......................... greater of 0.01 Wt.% O2 or 1% of measurement

Accuracy .......................... greater of 0.02 Wt.% O2 or 2% of measurement

Zero Drift ....................................... 1% of full scale/month, non-cumulative

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2. OPERATION

Please read all the following information before attempting to install the Ozone
Monitor. For assistance, please call 2B Technologies at (303)273-0559.

NOTE:
Save the shipping carton and packing materials that came with the Ozone
Monitor. If the Ozone Monitor must be returned to the factory, pack it in
the original carton. Any repairs as a result of damage incurred during
shipping will be charged.

Shipping Box Contents

Open the shipping box and verify that it contains all of the items on the shipping
list. If anything is missing or obviously damaged, contact 2B Technologies
immediately.

Operation of the Ozone Monitor

To operate the Ozone Monitor, connect it to an external power source and

power the instrument by switching the power switch on. The instrument
requires a 12 V DC source, which can be in the range 11-28 V DC without any
detrimental effects on the measurement.

Once turned on, the instrument will display the version number of the software
installed on the microprocessor. After a few seconds, the instrument will start
displaying readings for ozone. The first dozen readings (requiring about two
minutes) will be spurious, with large positive and negative swings due to the
rapid warmup of the lamp and electronics. Also, ozone readings may be
inaccurate during the first 20-30 minutes required for the lamp, photodiodes,
and internal temperature of the absorption cell to stabilize.

Inlet tubing may be attached to the ¼ inch stainless steel Swagelok fitting on
the back of the instrument. The inlet tubing should be made of PTFE (Teflon),
PFA, FEP, PVDF or some other inert material that does not destroy ozone and
that does not desorb plasticizers and other organics that can contaminate the
flow path. The length of tubing should be kept as short as possible (preferably
not more than a few feet) to minimize ozone destruction within the inlet tubing.
Tygon and polypropylene (which may look like Teflon) should not be used.
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The Ozone Monitor has an internal pressure relief device that protects the
instrument from excessive pressure. The device vents through an ozone
scrubber when the inlet pressure exceeds 50 psi and is not meant to be used in
normal operation. Although the ozone scrubber is made with an ozone
destroying catalyst that has very high ozone capacity, it may not scrub 100% of
the ozone if the flow exceeds several liters per minute. Operators of the
instrument should not rely on the pressure relief device as a pressure
regulating device or expose the instrument to pressures above 50 psi.

Measurement of the Zero Offset

If the instrument has not been used recently, check the zero measurement
before use. The zero offset of the instrument can be measured by first purging
the instrument with zero gas at a minimum flow rate of 0.2 L/min for at least 2
minutes. For an accurate measurement, the instrument must have been turned
on long enough for the internal temperature to stabilize. The observed offset
can be corrected for by running the zeroing function, as described below.

Collecting Data over the Serial Port in Real Time

To transmit data to a computer over the serial port in real time, connect the
Ozone Monitor to the serial port of the computer using the 9-pin cable provided.
Note that this is a “straight-through” female-female serial cable. A “cross-over”
cable will not work. Start your data acquisition software, preferably using the
2B Technologies Display and Graphing Software (free download from
http://twobtech.com/software.htm). Other terminal emulation software such as
HyperTerminal (a program provided with Windows) or Tera Term Pro may be
used as well.

The ozone concentration, internal cell temperature, cell pressure, reference

photodiode voltage (volts), sample photodiode voltage (volts), time and date
are sent as comma-delimited ASCII text to the serial and USB ports (2400,
4800 or 19200 baud as selected in menu; 8 bits; no parity; 1 stop bit) every two
seconds, ten seconds, 1 minute, 5 minutes, or 1 hour, depending on the
averaging time selected from the microprocessor menu. Time is provided in
24-hour (military) format, and the date is given in European style
(day/month/year).

A typical data line would read:

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1.03,31.7,835.9,1.28888,0.99086,01/03/10,08:40:55

where:

Ozone = 1.03 Wt.% O2

Cell temperature = 31.7 ˚C
Cell pressure = 835.9 mbar (1 atm = 1013 mbar)
Reference Photodiode voltage = 1.28888 volts
Sample Signal = 0.99086 volts
Date = January 3, 2010
Time = 8:40:55 am

If outputting logged data, the output serial data line will be preceded by the log
number; e.g.,

2893, 1.03,31.7,835.9,1.28888,0.99086,01/03/10,08:40:55

where 2893 is the log number.

In addition to data lines, messages are written to the serial port when logging is
begun or ended, when transmission of data from the logger is begun and
ended, when data collection is interrupted (e.g., due to a power failure) and
when the averaging time is changed.

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Menu

The following diagram summarizes the complete instrument Menu.

Main Menu

Zero Admin

Dat Avg Cfg Lmp

10s 1m 5m 1h

Xmt Log End

D/T Cal I/O Unt

D/T: 10:32:21
T/P O3
14/10/2009

Bdr Ext Hrs

V_In V_Out

Figure 2. Instrument Menu.

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Data Averaging and Data Logging Using the Menu

When first turned on, the instrument will start making measurements at a rate of
once every 10 s. Data may be logged in the internal data logger. Up to 32,736
data lines containing log number, ozone concentration, internal temperature,
internal pressure, reference photodiode voltage, sample photodiode voltage,
time and date may be stored in internal memory, corresponding to an
operational time of 3.8 days. Averaging times of 2 s, 1 min, 5 min and 1 hr also
may be selected from the menu, thereby allowing the instrument to operate for
18.2 hours, 22.7 days, 113 days and 3.7 years, respectively, before filling the
memory.

Selecting the Menu

The menu is accessed using the Select button on the front panel of the
instrument. To reach the menu, hold in the Select button until

Menu

is displayed, then release the Select button. After a few seconds the menu will
appear:
Menu
Zero Admin 

where Zero and Admin are submenus that may be selected. A blinking cursor
will show across the Z of the Zero submenu. The Select button may be rotated
clockwise or counterclockwise to move the cursor under the first letter of
another submenu. To select a particular submenu, move the cursor under the
first letter of a submenu and momentarily press (“click”) the Select button. To
exit the Main Menu and begin making measurements again, select and click on
the left arrow ().

To Auto-Zero the Instrument

Select and click on Zero to display:

Providing Zero
Air? Yes Cancel

Before continuing, purge the instrument with zero gas at a minimum flow rate of
0.2 L/min for at least 2 minutes and then select Yes. For an accurate

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measurement, the instrument must have been turned on long enough for the
internal temperature to stabilize. You will then see the status message:

Zeroing…

When the zeroing function is complete, you will see the status message:

Zeroing…
Found New Zero

The Ozone Monitor will then exit the Menu and return to measuring ozone.

To Log Data

Select and click on Admin, and then on Dat using the Select button. The
display will now show:
Dat Menu
Xmt Log End 

To start logging data, rotate the Select switch to move the cursor to Log and
click to select the logging mode. You will then receive the prompt:

Overwrite Data?
No Yes 

Warning: If you start logging, all data previously stored in the logger will
be irretrievably lost. If you have data in the logger that you want to keep, be
sure to download it (see below) before starting logging. Click on Yes if you are
sure you want to start logging new data. This will return you to the Dat Menu.
Click on  to return to the main Menu, and click on  again to exit the Menu
and start making measurements. Note that “” always takes you up one level
in the menu.

The Ozone Monitor will then alternate every 5 seconds between displaying the
most recent 10-s measurement and the current average value. For example,
the display might read
O3= 0.50 Wt.% O2
T=33.3 P=989.7

where the current 10-s measurement is 0.50 Wt.% O2, the temperature is 33.3
o
C and the pressure is 989.7 mbar. If 10-second averaging (no averaging) has
been selected, five seconds later, this display might be followed by

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 O3= 0.50 Wt.% O2
19:55 05/02/2010

showing that the time of the measurement is 7:55 pm and the date is 2 May
2010. If averaging has been selected, the above display will be replaced by

Avg O3= 0.55 Wt.% O2

19:55 05/02/2010

for example, where the most recent average value of ozone computed is 0.55
Wt.% O2. If data are being logged, the log number and number of new
measurements made for the next average (minus 1) are displayed in place of
the data and time; e.g.,

Avg O3= 0.12 Wt.% O2

Log= 193:4

where Avg O3 is the average ozone value most recently written to the logger,
and the current log number is 193. The “4” in 193:4 refers to the number of 10-
s data points that have been measured so far for inclusion in the next average
to be displayed and logged. If 1-min averaging is used, this number will
increment from 0 to 5; for 5-min averaging, the number will increment from 0 to
29; and for 1-hr averaging, it will increment from 0 to 359. This number is
displayed so that the user will know how many more 10-s measurements need
to be made before a new average is displayed and logged.

If there is a power failure while the instrument is in the logging mode, logging
will resume after power is restored. A note of “Data Interruption” will be written
to the logger prior to writing the first new data line. The instrument can
accommodate multiple data interruptions due to power failures. For example,
one can purposely switch the instrument off, move to another location and
restart logging simply by turning the instrument back on. Data sets will be
separated by the data interrupt message.

To Stop Logging Data

Hold in the Select button to obtain the Menu. Go to the Dat submenu by
clicking on Dat. Choose and click on the End function. This will end data
logging. You may now return to the Dat menu to transmit the data to a
computer by clicking on Xmt (see below). The stored data will reside in
memory (even when new measurements are being made) and can be
transmitted using the Xmt function as often as you like. However, all stored
data are lost once logging is started again using the Log function. Thus, you
should always transmit your data to a computer before restarting logging.
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If you fail to End logging prior to transmitting the data using the Xmt function,
the instrument will automatically execute the End function for you prior to
transmitting the data.

To Average Data

Hold down the Select button to obtain the Menu. Select and click on Admin,
and then on Avg to enter the Avg menu:

Avg Menu
2s 10s 1m 5m 1h 

Use single clicks to move the cursor to 2s, 10s, 1m, 5m or 1h for averaging
times of 2 s, 10 s, 1 min, 5 min or 1 hr averaging, respectively. Then click on
the averaging time you want to use. You will be returned to the main Menu.
To exit the Main Menu and start acquiring data, click on  again.

While in averaging mode, the current 10-s measurement is displayed

alternately with the average value at 5-s intervals, as discussed above.
Averaged data may be logged, thereby greatly extending the length of time that
the data logger can be used.

To Transmit Logged Data to a Computer Using the USB or Serial Port

Connect the USB or serial port of the instrument to your computer using the
appropriate cable. Enable a data acquisition program on the computer such as
the 2B Technologies Display and Graphing Software, which can be
downloaded at:

http://twobtech.com/software.htm

Alternatively, HyperTerminal can be used (available on most Windows

platforms, usually in Start/All Programs/Accessories/Communications/Hyper
Terminal) or Terra Term Pro, which can be downloaded at:

http://hp.vector.co.jp/authors/VA002416/teraterm.html

As mentioned earlier, the disadvantage of HyperTerminal is that it has a 500

line buffer limitation, but this limitation can be circumvented by logging the data
to a file as it is transmitted from the Ozone Monitor. The correct settings for
receiving data are: chosen baud rate (2400, 4800 or 19200); 8 bits; no parity; 1
stop bit.
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Click the Select button to obtain the Main Menu. Go to the Dat submenu by
clicking on Dat. Next, click on Xmt. The message “Logged Data” will be
written to the serial port, followed by a carriage return and all of the lines of
logged data. After all data are transmitted, the message “End of Logged Data”
and a carriage return are written. After transmission is complete, you can
return to any position in the menu or resume ozone measurements. The
logged data continues to be available for transmission until a new data log is
started.

To Change the Calibration Parameters

The instrument is calibrated at the factory where a slope parameter is entered

into the instrument’s memory. This preset calibration parameter is given in the
instrument’s Birth Certificate and recorded on the calibration sticker on the back
of the instrument. However, the calibration parameters may be changed by the
user. For example, it may be desirable to provide a positive offset by a known
amount (e.g., 0.10 Wt.% O2) if the analog output is being used for external data
logging since the analog voltage output does not go negative below zero Wt.%
O2, and the current output does not go below 4 mA. Because of noise and/or
an inherent offset, some measured values will be below zero at very low ozone
concentrations or while zeroing the instrument with zero gas. Also, the
instrument zero may drift by a few hundredths of 1 Wt.% O2 over time. For this
reason, zeroing of the instrument using zero gas to determine the offset is
recommended. Any change in the slope (gain) of the instrument is likely due to
a serious problem such as contamination, but it also can be adjusted. Once the
zero of the instrument is corrected, the slope may be adjusted so that the
instrument readout agrees with the readout from another instrument whose
calibration is considered to be accurate.

To change the calibration parameters, choose the Cfg submenu from the main
Menu and click on Cal to obtain the display

Cal Menu
Z= 0.03 S= 1.012

Here Z is an applied offset (in this case 0.03 Wt.% O2) and S is the slope
applied (in this case 1.012). The value of Z will be 0.00 if you have performed
the auto-zeroing procedure described above. You can provide an offset,
however, by changing the value of Z here. When reporting ozone, the value of
S is multiplied by the measured ozone value and then the value of Z is added.
During calibration, the instrument is first auto-zeroed and checked to make sure
that a reading of zero is obtained with sampling air or oxygen containing no
ozone. The value of S is set to 1.000 and ozone having a know concentration
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is measured. If, for example, the instrument consistently reads 2.5% low, the
value of S is then set to 1.025. If an offset is desired (e.g., when using an
analog output to record the data), the value of Z may then be adjusted to the
value of the desired offset.

When the Cal Menu first appears, the Z will be underlined with a cursor. You
may rotate the Select switch to choose the calibration parameter S or Z. A
single click on S or Z will select that parameter for change and activate a
blinking cursor. Once S or Z is selected, its value can be changed by rotating
the Select switch to the left or right. After choosing the desired value, a click
turns off the blinking cursor and allows you to scroll to the other parameter or to
 to exit the submenu. Once the values of Z and S are set, clicking on  will
return the display to the Cal menu, another click on  to the Cfg menu, and
another click on  will return to the Main Menu. The calibration parameters
reside in non-volatile memory and are not affected by power failures.

To Set the Time and Date

From the Main Menu, select the Cfg submenu. Next, select the D/T submenu.
The display will read, for example:

D/T: 14:32:21 
17/10/2009

meaning that it is 21 seconds after 2:32 p.m. on October 17, 2009 (military time
and European date). To change a number in the date and time, rotate the
Select switch to underline the numeral you want to change. A single click then
causes a blinking cursor to cover that numeral. The number can then be
changed by rotating the Select switch. Once the number is correct, click on the
Select switch to turn off the blinking cursor. You may now rotate the Select
switch to choose another numeral to change. Once the time and date is
correct, clicking on  will set the internal clock to that time and return the
display to the Cfg menu. As in setting a digital watch, the seconds should be
set in advance of the real time since the clock starts to run again only when the
set time is entered; in this case by clicking on .

Accessing the Serial Menu

Instrument parameters and logging tasks can be accessed via the serial port or
the USB using a terminal emulator such as Tera Term Pro or HyperTerminal
running on an attached computer. Commands can be sent using the terminal
emulator set with the properties listed in the section of this manual “Collecting
Model 106-H Ozone Monitor Manual Rev. C
14
Data over the Serial Port in Real Time”. Listed below are the lower case letters
that are commands for performing certain operations while the instrument
continues to measure:

l Start logging and write over existing logged data

t Transmit logged data
e End logging
h Output serial data line header
m Serial menu

If the letter m is sent as a command, menu> will be displayed in the terminal

emulator window. When the serial menu is accessed, the instrument is no
longer making measurements; it is waiting for the next command to be entered.
The following is the list of menu items accessible from this point:

l Start logging and write over existing logged data

t Transmit logged data
e End logging
h Output serial data line header
a Displays list of possible averaging times and the number that must be
entered to change to the desired averaging time
z Displays current zero calibration setting and waits for new setting
followed by a carriage return
s Displays current slope calibration setting and waits for new setting
followed by a carriage return
c Clock menu, displays current date and time and waits for d or t to be
entered
From clock menu,
d Asks to enter date in DDMMYY format
t Asks to enter time in HHMMSS format
x Exit menu and return to measuring

Collecting Data from the Analog Output

The data may be logged in real time using a data logger attached to the D9
connector on the back panel of the instrument using either a voltage or current
recorder or data logger. The 0-2.5 V output is measured across pins #1 (+) and
#5 (ground). The 4-20 mA current output is measured across pins #9 (+) and
#5 (ground). Looking at the back of the instrument, the pin numbers for the
connector are:

Model 106-H Ozone Monitor Manual Rev. C

15
 1 2 3 4 5

6 7 8 9

To change the analog output voltage scaling factor, go to Menu/Cfg/I/O/Ext.

The display will briefly read “VOUT Menu” followed by

2.5V=01.00 Wt.% O2
20mA=01.00 Wt.% O2 

In this example, the output scaling factor is set as 2.5 Volt (full scale) = 1.00
Wt.% O2; i.e. 1 Volt = 0.40 Wt.% O2. Also, the current output will be scaled
such that the full scale of 20 mA corresponds to 1.00 Wt.% O2. A reading of
zero ozone concentration will be output as 0 V and as 4 mA. You can use the
select switch to change the scaling factor to the value of your choice by
selecting and changing the individual digits in the scaling factor of either the
voltage or current. Thus, the instrument is not limited to a fixed number of
“ranges” common to most ozone monitors. Instead, any range can be defined.

To Set the Relay Limits

The Ozone Monitor may be used to control other devices such as ozone
generators using a 12 amp relay. To set the On and Off limits of the relay,
choose REL from the Ext submenu. The menu will show, for example:

On =04.90 Wt.% O2
Off=05.10 

With these settings the relay will close (pass current) until the ozone
concentration exceeds 5.10 Wt.% O2. Above this concentration the switch relay
will open. The relay will not close again until the ozone concentration drops
below 4.90 Wt.% O2. In this way, for example, ozone concentration from an
ozone generation could be controlled in the range 4.90 to 5.10 Wt.% O2. You
may now move the cursor using the Select switch to choose the digits in the On
and Off relay settings, choose a digit to change by depressing the Select
switch, and rotate the Select switch to change those settings. To choose
another digit to change, depress the Select switch again to remove the blinking
cursor.

Physical connection to the relay is made by means of a supplied screw

connector for attaching wires to your device. The center terminal is common.
When viewing the connector from the rear of the instrument, the terminal on the

Model 106-H Ozone Monitor Manual Rev. C

16
right is in normally open (i.e., it closes when the ozone concentration is below
the first setpoint). This is the connection you would ordinarily use. The screw
connector on the left is normally closed; i.e., it behaves in the opposite manner
as the right screw terminal.

To Change the Baud Rate

The baud rate for transmission of data to a computer over the USB or serial
port may be changed by going to Menu/Admin/Cfg/I/O/Bdr to obtain:

Baud Menu
2400 4800 19200 

Choosing a baud rate will automatically return you to the I/O submenu.

To Read the Number of Hours of Ozone Monitor Use

The instrument keeps track of the total number of hours of use. This is helpful
for determining when the instrument should be serviced, a pump replaced, etc.
To read the number of hours of operation choose Menu/Admin/Cfg/I/O/Hrs.

To Change the Ozone, Temperature and Pressure Measurement Units

From the Cfg submenu, choose the Unt submenu:

Unt Menu
T/P O3 

Select O3 from the Unt submenu to change the units reported for ozone
concentration:

O3 Units Menu
Wt%O2 Wt%air g/Nm3 g/m3 Vol% 

You may now select units of percent by weight in oxygen (Wt%O2), percent by
weight in air (Wt%air), grams per normalized cubic meter (g/Nm3, normalized to 1
atm. and 0 oC), grams per cubic meter (g/m3) or percent by volume (Vol%).

Select T/P from the Unt submenu to change the units reported for temperature
and pressure:

T/P Units Menu

Model 106-H Ozone Monitor Manual Rev. C
17
 T:C P:mbar 

You may now select units of oC or K for temperature and mbar, torr or psia for
pressure using the same procedure used to set the units for ozone
concentration.

Lamp Test

If the instrument always reads near zero in the presence of ozone or if the Low
Lamp light is turned on, it is useful to perform the lamp test to make sure that
the lamp is turning on. Before performing the lamp test, allow the instrument to
warm up for at least twenty minutes.

Choose Lmp from the main Menu. The display will momentarily read “Lamp
Test”. The photodiode voltages will then be displayed, for example:

Smp=1.24578 V
Ref=1.50364 V 

The photodiode voltages (PDV) are a measure of the lamp intensity and should
be in the range 0.6-2.2 volts. Since absorbance is a ratio measurement, the
absolute value of the voltages is not particularly important. However, above 2.5
volts, which could occur if the instrument is allowed to become too hot, the
photodiode is saturated and the calculated ozone concentration will be zero.
Photodiode voltages less than 0.6 volts without any ozone in the cell are
indicative of either a weak lamp or a dirty detection cell and may result in a
noisy measurement. Photodiode voltages will typically increase as the
instrument warms up. Lamp drift is continuously monitored and corrected for in
the firmware and thus has very little effect on the measured ozone
concentration. If your lamp fails the lamp test during the first year of operation,
contact us for a new lamp under the instrument warranty.

Model 106-H Ozone Monitor Manual Rev. C

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3. MAINTENANCE/TROUBLESHOOTING

The Ozone Monitor is designed to be maintenance-free. The only component

with a limited lifetime is the lamp, which has a lifetime of ~20,000 hours. It is
recommended that the instrument we returned to 2B Technologies if any
component fails. Alternatively, the user may install components at their own
risk. In that case, please contact 2B Technologies for instructions.

The 106-H has four status LEDs on the front plate to indicate any system
issues that may require troubleshooting:

Cell Dirty: Indicates that the ratio of the sample photodiode voltage to the
reference photodiode voltage is less than 0.5. This status light can only be
activated during the zeroing function when the cell is purged with zero gas.
The normal state is OFF.

Low Flow: This function is not yet operational. In a future revision, the LED
will indicate when there is insufficient flow through the instrument. The
normal state is OFF.

Low Lamp: Indicates that the lamp intensity, measured by the reference
photodiode, is below 0.6 volts. The normal state is OFF.

Power On: Indicates that there is power to the instrument and that the main
circuit board is working properly. The normal state is ON.

The following are indications of various instrument malfunctions.

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19
 Table I. Troubleshooting the Ozone Monitor for performance problems.
Problem/symptom Likely cause Corrective action
Instrument does not Power not connected Check external power
turn on (Power On LED properly or circuit connection for reverse
is OFF). breaker open. polarity or a short and
wait a few minutes for
the thermal circuit
breaker to reset.

Lamp Low LED is ON. The lamp intensity is low. If the reference
photodiode voltage is
near 0.6 volts, the
instrument may still
function properly, but the
lamp should be replaced
when possible.

Cell Dirty LED is ON. Absorption cell is dirty. Clean the cell.

Poor instrument zero. Zero the instrument

Display is blank or Bad connection of Remove top cover and

nonsense. display to circuit board. reconnect display to
circuit board. Check
solder connections to
display. A new LCD may
be required.

Cell temperature reads Absent or loose Remove top cover and

low by several 10’s of connection of reattach connector to
degrees. temperature probe cable circuit board.
to circuit board.

Analog output is Cable not properly Check continuity of your

constant or does not connected between analog cable to your
track front display. analog output and recording device and
recording device. make sure correct
connector pins are being
used.

Wrong scaling factor Check and reset analog

selected In menu. output scaling factor in
the Menu.
Model 106-H Ozone Monitor Manual Rev. C
20
Select switch does not Bad solder joint to circuit Remove top cover and
work. board or damaged select check solder connection
switch. to select switch. It may
be necessary to replace
the select switch.

Serial port does not Wrong serial cable used. A “straight through”
work. serial cable is provided.
Some data collection
devices require a ”cross
over” cable in which pins
1 and 3 are exchanged
between the two ends of
the cable. Use a “cross
over cable or additional
connector that switches
pins 1 and 3.

Wrong baud rate Make sure that the baud

selected. rate chosen in the menu
matches the baud rate
setting of your data
acquisition program.

Required calibration Flow path is Clean flow path with

parameters are large contaminated. methanol following the
(>15% slope) when Cleaning Procedure.
calibrated using a
reliable ozone
instrument.

2B Technologies offers reasonably priced customer service for instrument

repairs. The calibration service includes cleaning of the entire flow path with
methanol, testing of all components for proper function and calibration against
an IOA-traceable standard. The best way to contact us for service is to log a
customer service ticket at www.twobtech.com/techsupport. Normally, you will
hear back from us by email within a few hours. Or, call us at +1(303)273-0559.

There is a great deal of technical information about our instruments posted as

technical notes at www.twobtech.com/tech_notes.htm. Manuals, brochures,
software, cleaning procedures and scientific papers may be downloaded at
www.twobtech.com/downloads.htm.

Model 106-H Ozone Monitor Manual Rev. C

21
4. CALIBRATION

Every analytical instrument is subject to some drift and variation in response,

making it necessary to periodically check the calibration. Since the reliability of
the data collected from any analytical instrument depends on the accuracy of
the calibration, it is necessary to calibrate the instrument against a recognized
standard such as the International Ozone Association (IOA) KI method. This
method is detailed in the Iodometric Method for the Determination of Ozone in a
Process Gas, Revised Standardized Procedure 001/96 (KI Method) established
by members of the Quality Assurance committees of the International Ozone
Association (IOA), including the Pan American Group (PAG), Euorpean African
Group (EAG) and Nippon Islands (NIG). This procedure is an expanded
version of the IOA method described in: Rakness, K., et al., Guideline for
Measurement of Ozone Concentration in the Process Gas from an Ozone
Generator, Ozone Science and Engineering 18, 209-229 (1996). It should be
noted that there is no method directly traceable to NIST for ozone
concentrations above 1 ppm.

Equipment Required

For routine calibration, an instrument can be calibrated against a working ozone

standard, which is an ozone monitor that has been calibrated against the IOA
KI method. The equipment that is needed to carry out the calibration is
commercially available. Calibration using a working ozone standard involves
the generation of ozone concentrations that are simultaneously measured by
the working standard and the instrument undergoing calibration. This
procedure requires the following equipment:

1. Zero gas source

2. Ozone generator
3. Sampling manifold (inert material such as PTFE or FEP only)
4. Sampling lines (inert materials such as PTFE or FEP only)
5. Ozone monitor calibrated against the IOA KI Method

CALIBRATION PROCEDURE

A multipoint calibration should be performed within the calibration frequency,

any time major disassembly of components is performed, or any time the span
checks give results outside of the acceptable limits.

Model 106-H Ozone Monitor Manual Rev. C

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Instrument Preparation
1. Turn on the Model 106-H Ozone Monitor and allow it to stabilize for a
minimum of one hour.
2. Allow the working standard to warm up according to the instrument
user manual.
3. Enter the calibration menu (Main Menu\Admin\Cfg\Cal\O3) and set
the zero (Z) value to 0.00 and the slope (S) value to 1.000.
4. Connect the ozone monitor to the manifold on the ozone calibration
setup.

Measurement of Zero Gas

1. Verify that the zero gas supply is on and the ozone generator is off.
The same zero gas supply used in the ozone generator must be used
in the ozone generator.
2. Allow the Model 106-H to sample zero gas until the response is
stable.
3. Perform the zero function in the menu.

Measurement of Ozone Standards

1. Generate an ozone concentration slightly less than the concentration
range of interest and allow the ozone generator to warm up for at
least 5 minutes. The same zero gas supply used for making zero gas
measurements must be used in the ozone generator.
2. Allow the Model 106-H Ozone Monitor to sample the ozone
concentration standard until a stable response is measured.
3. Record the average response of the ozone monitor as well as the
average response of the working standard.
4. Generate several other ozone concentration standards. At least 5
ozone concentration standards are recommended over the range of
interest.
5. For each ozone concentration standard, record the response of the
ozone monitor as well as the working standard.

Calibration Curve
1. Plot the Model 106-H Monitor responses (x-axis) versus the
corresponding standard ozone concentrations (y-axis).
2. Fit the data to a straight line (y = mx + b) using the linear regression
technique to determine the calibration relationships.
3. Determine if any points deviate significantly from the line, which is an
indication of an error in determining the calibration curve. The error
may be due to the calibration setup or the ozone monitor being
calibrated.
4. The slope of the line is the gain factor (S) that needs to be applied to
the ozone monitor response to calibrate it to the working standard. If
Model 106-H Ozone Monitor Manual Rev. C
23
 the slope is outside of the range from 0.950 to 1.150, this is an
indication of a problem in the calibration setup or the ozone monitor
being calibrated.
5. Enter the calibration menu (Main Menu\Admin\Cfg\Cal\O3) in the
instrument software and set the slope calibration parameter.

PERIODIC SPAN CHECKS

To ensure the quality of the ozone monitor data, periodic zero and span checks
can be performed by following the steps below:
1. A span check is performed by sampling an ozone concentration at
the high end of the concentration range of interest following the
“Measurement of Ozone Standards” section above.
2. Average measurements from the zero check or span check should
be within the instrument specifications. If the measurements are not
within specifications, this is an indication of problem in the calibration
setup or the ozone monitor being checked.

Model 106-H Ozone Monitor Manual Rev. C

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 Serial Port/
Relay Connector Analog Out
USB Connector 12 V Power In

Pressure Relief
Device (bottom)

Pressure Microprocessor
Sensor (top)
Optical
Bench

Lamp
Connector
Programming
Switch
5-V Regulator/
Cell Heater
Connector

Temperature
Pressure Relief Connector
Scrubber

Sample
Photodiode
Connector

Reference
Photodiode
Clock Battery Connector

Figure 3. Standard Version of the Model 106-H.

Model 106-H Ozone Monitor Manual Rev. C

25
 LCD

Status LEDs Select Switch

Figure 4. Front Plate of the Model 106-H.

Power Switch

Serial Number

Outlet

12 V Power In
Inlet

USB Serial Port/ Relay Programming

Connector Analog Out Connector Jumper

Figure 5. Back Panel of the Model 106-H.

Model 106-H Ozone Monitor Manual Rev. C

26
5. PARTS LIST

The following list includes those parts that are user serviceable.

Part Number Description

OZLAMP106 Lamp and inverter

OZDSP106 LCD display and cable
PDASSY106 Photodiode assembly and cable
RELCON Relay connector
SERCABL Serial port cable (to computer)
USBCABL USB Cable
TEFTYG Teflon-lined Tygon tubing

Model 106-H Ozone Monitor Manual Rev. C

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6. SERVICE LOG

Date/ New
Calibrated Cleaned Other
Hours Lamp

Model 106-H Ozone Monitor Manual Rev. C

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Date/ Calibrated Cleaned New Other
Hours Lamp

Model 106-H Ozone Monitor Manual Rev. C

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APPENDIX A: USB INSTALLATION
The following procedure describes how to install the USB connection for the
Model 106-H.

Items Required

 Model 106-H Ozone Monitor

 USB Cable
 PC Computer with Windows 2000 or XP
 USB to UART Driver Disk

Driver Installation

1. Insert USB to UART Driver Disk in the computer’s CD ROM drive.

2. The installation files are located in a zip folder on the CD. Navigate to
the folder labeled “cdc_NTXP” and double click on it.
3. Unzip the contents to a folder on the desktop or any area you wish.
4. With the Model 106-H off, attach USB cable from the 106-H to a USB
port on the computer.
5. Turn on Model 106-H. The install wizard should pop up as follows.
Select “No, not this time” and click “Next”.

Model 106-H Ozone Monitor Manual Rev. C

30
6. Select the “Install from a specific location” option and click “Next”.

7. Navigate to folder where you unzipped the cdc_NTXP.

Model 106-H Ozone Monitor Manual Rev. C

31
8. Select “Continue Anyway” when this window appears.

9. After a few seconds, the driver will be finished installing.

Model 106-H Ozone Monitor Manual Rev. C

32
APPENDIX B: USING THE USB CONNECTION

Determine the connection port

After installation is complete, determine which COM port the connection is

using. This can be done by the following procedure.

1. If using Windows (XP, Vista 7), go to the control panel and select
“System”.
2. Click on the “Hardware” tab.

3. Click the “Device Manager” button.

4. Press the “+” sign next to “Ports”.

Model 106-H Ozone Monitor Manual Rev. C

33
 5. In parenthesis, next to the “USB to UART” listing is the assigned COM
port number. This number will be used for the settings for the Terminal
emulator or software used to read data from the Model 106-H.

Using the Connection

 Plug the USB cable in after the powering the Model 106-H to ensure
correct functionality.
 When setting up your software or terminal emulator, choose the correct
com port listed in the Device manager.
 Use these baud rate settings: 2400, 8 bits; no parity; 1 stop bit.
 Use 2B Technologies Display and Graphing Software (free download
from http://twobtech.com/software.htm) to read measurement data from
the Model 106.

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