ION TVOC User manual

TVOC Instrument User Manual V3.0
TVOC Instrument User Manual Part Number: 849215
Register your instrument online
to receive your Extended 2 Year
Warranty. See page 23 for
details.

TVOC MANUAL Ion Science Ltd
Page 2 of 28

Declaration of Conformity
Manufacturer: Ion Science Ltd, The Way, Fowlmere, Cambridge, SG8 7UJ, UK
Product: TVOC
Product Description: An intrinsically safe fixed continuous monitor comprising of a photo-ionisation
detector for detecting and measuring volatile organic compounds with a 4-20mA
output
Directive 94/9/EC ATEX
Identification: II 2G Ex ia IIC T4 (-20oC ≤ Ta ≤ +50oC)
Notified Body: Baseefa Ltd, 1180, Buxton, UK
Identification: II 3G Ex nL IIC T4 (-20oC ≤ Ta ≤ +50oC)
Ion Science Ltd Self certified EC Type Examination Certificate(s)
Baseefa05ATEX0277 latest supplement Baseefa05ATEX0277/2 issued 24th November 2008
IECEx BAS 06.0057 latest revision no.1 issued 20th November 2008
Ref Baseefa Cert Report 05(c)0423, 06(c)0614, 08(c)0578
Ionscience09ATEX002 Examination certificate issued 3rd September 2009
Ref Ion Science Cert Report 849237, 849242
Standards
BS EN 60079-0:2006 Electrical Apparatus for Potentially Explosive Atmospheres –General Requirement
BS EN 60079-11:2007 Explosive Atmospheres - Equipment Protection by Intrinsic Safety ‘i’
BS EN 60079-15:2007 Explosive Atmospheres - Equipment Protection by other means ‘n’
BS EN 61010-1:2001 Safety requirements for electrical equipment for measurement, control and
laboratory use –General requirements
Directive 2004/108EC Electrical Equipment –Electromagnetic Compatibility (EMC)
EN61000-6-3:2007 Class 1 (light industrial and domestic) Electromagnetic Compatibility (EMC) Generic
standards. Emission standard for residential, commercial and light industrial
environments
EN50270:2006 Electromagnetic compatibility. Electrical apparatus for the detection and
measurement of combustible gases, toxic gases or oxygen.
Other Standards
BS EN ISO 9001:2000 Quality Management Systems –Requirements
BS EN 13980:2002 Potentially Explosive Atmospheres –Application of Quality Systems
On behalf of Ion Science Ltd, I declare that, on the date this product accompanied by this declaration is
placed on the market, the product conforms to all technical and regulatory requirements of the above listed
directives.
Name: Mark Stockdale Position: Technical Director
Signature: Date: 20th November 2009

TVOC MANUAL Ion Science Ltd
Page 4 of 28
Contents Page
1 –Statements . . . . . . 5
2–Introduction to TVOC . . . . . 6-7
3 –Packing List . . . . . . 8
4 –TVOC Set up . . . . . . 9-10
Selector pins . . . . . . 9
Cycle times . . . . . . 10
5 –Installation . . . . . . 11-14
Location . . . . . . 11
Mounting . . . . . . 11
Cable requirements . . . . . 12
Power requirements . . . . . 12
Non Intrinsically Safe (IS) applications . . 12
Intrinsically Safe (IS) applications. . . 13
Initial calibration . . . . 14
6 –Operation . . . . . . . 15-16
Start up. . . . . . . 15
Cycle times . . . . . . 15
LED’s . . . . . . . 16
Selector pins . . . . . . 16
Calibration mode . . . . . 16
7 –Calibration . . . . . . 17-19
Calibration routine . . . . . 17
Setting the zero . . . . . . 17
Setting the gas tolerance . . . . 18
Setting the span . . . . . 18
Display lamp life . . . . . 18
8 –Maintenance . . . . . . 20-22
Cleaning and replacing the PID lamp . . . 20
Fuse rupture and replacement . . . . 22
Lamp warranty statement . . . . 22
9 –Instrument Warranty and Service . . . 23
10 –Diagnostics . . . . . . 24-25
11 –Spare parts . . . . . . 26
12 –Technical Specifications . . . . 27
13 –Update Log . . . . . . 28

TVOC MANUAL Ion Science Ltd
Page 5 of 28
1 Statements
Responsibility for use
TVOC detects a large range of gases, which are potentially dangerous from both a poisoning and/or an
explosive perspective. TVOC has a number of selectable features allowing the detector to be used in a
variety of applications. Ion Science Ltd can accept no responsibility for the incorrect adjustment of features
that cause harm or damage to persons or property. It is the users’ responsibility to respond appropriately to
the readings delivered.
Warning
1. Substitution of components may impair intrinsic safety and result in unsafe conditions.
2. For reasons of safety, TVOC must only be operated and serviced by qualified personnel.
3. Please read and understand this user manual fully before installing, operating or servicing TVOC.
Quality assurance
TVOC has been manufactured in compliance with ISO9001:2000, which ensures that the equipment supplied
to our customers has been designed and assembled reproducibly, from traceable components, and leaves
Ion Science calibrated to stated standards.
Disposal
Dispose of TVOC and its components in accordance with all local and national safety and environmental
requirements. This includes the European WEEE (Waste Electrical and Electronic Equipment) directive. Ion
Science Ltd offers a take back service. Please contact us for more information.
Contact Ion Science Ltd
USA Office
Ion Science Americas LLC
35 Crossroad
Waterbury
VT 05676
USA
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.ionscience.com
UK Head Office
Ion Science Ltd
The Way, Fowlmere
Cambridge
SG8 7UJ
UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.ionscience.com
German Office
Ion Science Messtechnik GMBH
Laubach 30
Metmann-Neandertal
40822
GERMANY
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.ism-d.de

TVOC MANUAL Ion Science Ltd
Page 6 of 28
2 Introduction to TVOC
TVOC is a fixed continuous monitor for the detection and measurement of total volatile organic compounds,
which can be dangerous from both a poisoning and explosive perspective. Total VOC’s are detected using
PID (Photoionisation Detection) technology.
TVOC has a number of user selectable features which define its operation and will be application
dependent. The user can define the detection ranges or 0.01 - 10ppm, 0.1 –100 ppm or 1 –1,000 ppm
(Default); detection units, either ppm or mg/m3; and the duty cycle time i.e. the frequency that the
instrument takes a measurement. Duty cycles are explained in more detail on page 10, TVOC set up, and
page 15 Operation.
IMPORTANT: TVOC can be calibrated on alternative gases to Isobutylene however to ensure TVOC
remains within specification, the correct concentration for the alternative gas must be chosen.
Example: Benzene gas has a response factor of 0.5 which means only half as much concentration is required
to produce the equivalent to Isobutylene.
The ideal gas / concentrations used to set the calibration SPAN are shown below:-
Lower limit Upper limit
10 ppm range 8 ppm 12 ppm Isobutylene equivalent
100 ppm range 90 ppm 110 ppm Isobutylene equivalent
1,000 ppm range 90 ppm 110 ppm Isobutylene equivalent
How to calculate alternative concentration of gases for gases other than Isobutylene:-
Ideal response Response factor Ideal calibration gas
for Isobutylene concentration
Benzene 100 x 0.5 = 50 ppm
Isoprene 100 x 0.7 = 70 ppm
Isobutylene 100 x 1.0 = 100 ppm
Carbon Disulphide 100 x 1.4 = 140 ppm
Ethyl Acrylate 100 x 2.0 = 200 ppm
For other gas response factors please refer to the Ion Science web site or contact Ion Science Ltd.
http://www.ionscience.com/GasSearch/tabid/87/Default.aspx
WARNING: Ignoring these guide lines may result may result in calibration failure, loss of resolution or loss
of range.
The default settings of TVOC are:
Detection range –0.1 –1000 ppm
Units - ppm
Duty cycle - 5 seconds ON / 55 seconds OFF
TVOC gives a continuous 4 –20 mA output which can be integrated into a DCS control system to give an
indication of VOC levels in the operating environment.
In addition to the 4 –20 mA output TVOC has an LCD display showing gas concentration and 4 colour LED’s.
LED functions are as follows:
Green - is an indicator of TVOC’s working status
Red - is the fault indicator
Yellow x 2 - are calibration status indicators
Please see page 18Calibration for more information on LED status.

TVOC MANUAL Ion Science Ltd
Page 7 of 28
2 Introduction to TVOC
For installation requirements please refer to Pages 11 and 27 of this manual. Before attempting an
installation, please fully read and understand this user manual, and for hazardous area (IS) installations
please also refer to the TVOC ATEX or IECEx certificate for further details.
The TVOC safety rating permits its deployment in all hazardous areas of the quoted (or less demanding)
rating. For detail please refer to the marking on your instrument (found on the front main label). As of 1st of
October units will be manufactured with two protection concepts applied by separate certifications. Intrinsic
safety (ia) and Non sparking (nA). All units manufactured up to that date will only have intrinsic safety.
a) Intrinsic Safety (ia) permits the deployment in areas where explosive gases (of group IIA, IIB and IIC) are
intermittently present (zone 1) with an ambient temp range of -20°C to 50°C. Intrinsically safe installations
will require the use of safety barriers and appropriate wiring.
b) Non sparking (nA) permits deployment in areas where explosive gases (of group IIA, IIB, IIC) are unlikely
but possible (Zone 2) with ambient temp range of -20°C to 50°C. Non sparking installations do not require
safety barriers however the maximum working voltage should be strictly adhered to as a matter of safety. As
no safety barriers are required there is complete flexibility on the implementation of 3 wire system.
TVOC does require regular calibration onsite please see page 18 Calibration for information. TVOC calibration
mode is accessed via a magnetic read switch system.

TVOC MANUAL Ion Science Ltd
Page 8 of 28
3 Packing List
All items of equipment shipped by Ion Science Ltd are packed in suitable containers and enclosed in a shock
absorbing filling which affords a considerable degree of protection against physical damage.
Contents should be carefully removed and checked against the packing list. Any discrepancies between the
contents and the packing list must be reported to Ion Science Ltd within 10 days of receipt of shipment. Ion
Science cannot be held responsible for shortages not reported with in the period.
Standard TVOC instrument
Item Description Qty
1. TVOC instrument 1
2. Cable gland M20 ATEX Ex e 23. Blanking plug M20 ATEX 1
4. TVOC Manual 1
TVOC Calibration Tool Kit
Item Description Qty
1. Calibration magnet 1
2. Calibration adaptor 1
3. Calibration connector 1
4. Aspirator 1
5. Carbon filter 1
6. Allen keys 1
3. Calibration
Connector
1. Calibration
Magnet
6. Allen Keys X 2
4. Aspirator
2. Calibration
Adaptor
5. Carbon
Filter

TVOC MANUAL Ion Science Ltd
Page 9 of 28
Diagram 4.1
4 TVOC Setup
4.1 Selector Pins
TVOC has a number of settings that can be selected by the user
via a row of 4 selector pins mounted on the reverse side of the
main PCB. Diagram 4.1 shows the location of the functional
selector pins labelled - A, B, C & D.
The selector pins absence or presence determines the chosen
setting.
TVOC is shipped with all 4 selector pins fitted as shown in
diagram 4.2.
Diagram 4.3 demonstrates the removal of 1 selector pin.
The following table shows the selector pin combinations and the corresponding function.
= Selector pin fitted
= Selector pin removed
Selector pin
A B C D Range Displayed units
(n/a) 1000 ppm (Default)
(n/a) x100 ppm
(n/a) x10 ppm
(n/a) x2280 mg/m3
(n/a) xx228 mg/m3
(n/a) xx22.8 mg/m3
Selector pin ‘B’ and ‘C’ selects the ranges - 10ppm, 100ppm or 1,000ppm
Selector pin ‘D’ selects the units - ppm’ or ‘mg/m3
Selector pin ‘A’ - Currently not used
Diagram 4.1
Diagram 4.2
Diagram 4.3

TVOC MANUAL Ion Science Ltd
Page 10 of 28
4 TVOC Setup
IMPORTANT: if the 10ppm range is selected the TVOC will require a calibration using 10ppm Isobutylene
before use. (See the calibration section of this manual)
NOTE: * TVOC is shipped with all selector pins fitted as standard
* TVOC only reads the selector pin settings when power is connected.
Always ensure power is disconnected from TVOC before changing
setting or carrying out maintenance.
* Never place selector pins on the programming port connector.
* Ensure static build up is discharged before touching components.
4.2 Duty Cycle
The TVOC has a variable duty cycle whereby the lamp is ON for 5 seconds and then OFF for a user set
period between 0 to 5 minutes in 1 second increments. The 4 –20 mA output is updated at the end of each
cycle. As standard the TVOC duty cycle is 1 minute –the lamp is ON for 5 seconds and OFF for 55 seconds.
The lamp OFF time is fully adjustable by the user. Please see page 15of this manual for full instructions.

TVOC MANUAL Ion Science Ltd
Page 11 of 28
5 Installation
5.1 Location
There are many variables involved in defining the optimum location for a gas detector. Obvious though it
may sound, the most important rule is:
A detector will not detect gas unless gas actually reaches the detector.
TVOC should be mounted in the location most likely to detect gas.
TVOC must be mounted vertically with the sensor underneath the case. This avoids dust and debris
blocking the access to the detector cell.
Mount TVOC higher if detecting VOC gases that are lighter than air or lower if detecting VOC gases
that are heavier than air (but never on the floor). This should maximise detection.
Mount TVOC in an area that has good air circulation. Restricting natural air current may result in
delayed detection.
Never mount TVOC in direct sunlight or over a heat source such as a radiator. This may cause TVOC to
exceed its certified working range.
Do not mount TVOC where it’s subjected to rain fall, water, aerosols, mist or heavy condensation.
Mount TVOC’s in areas that are easily accessible for servicing.
Percentage variations in the composition of air (78% Nitrogen, 21% Oxygen and 1% Argon) may
affect the detected signal.
Please refer to the technical specifications of the instrument in page 27of this manual before
beginning a TVOC installation.
5.2 Mounting
Dimensions for mounting TVOC are given in Diagram 5.2.1 below.
Diagram 5.2.1
NOTE: The TVOC case can be used as a template when marking out fixing holes but do not drill
through the fixing holes.

TVOC MANUAL Ion Science Ltd
Page 12 of 28
5 Installation
5.3 Cable and gland requirements
Screened cables for both power and signal out are necessary to achieve EMC compliance. Cable
screens must be terminated at both ends for them to be effective in achieving electromagnetic
compatibility (EMC). The screens should be terminated to the TVOC enclosure using EMC compatible
cable glands. It is important for an EMC compatible gland to make electrical contact to the enclosure.
This is usually done using a serrated washer or EMC lock nut that bites through the paint making
electrical contact. EMC lock nuts have been provided. These locknuts are orientation specific the
points should be facing against the case in order to cut through the pain during tightening.
Two M20 ATEX cable glands and one ATEX blanking plug have been supplied as standard to ease
installation in most circumstances. These parts will not be appropriate for all applications so they
should be used at the discretion of the installation engineer. It is recommended that the
manufacturer’s instructions are followed for the gland and blanking plug installation. The M20
blanking plug has been included to enable installations using a single entry cable (for example a
three wire system) to be implemented.
While ion science can not recommend the cable gland suitable for every application the following
information may be useful to the installation engineer for the selection of the appropriate cable
gland.
For ATEX Ex i (intrinsically safe) operation using safety barriers, the only requirements on
the cable glands are that they are better than IP20 rated. This may seem extraordinary
however where the power is safely limited to the TVOC it is intrinsically safe so does not rely
on the prevention of dirt or moisture into the enclosure.
For ATEX Ex n the Cable glands must be ATEX rated (Ex e, Ex n or Ex d) and at least IP54.
5.4 Power requirements
5.4.1 Non ATEX applications:
Input power 5 - 28Vdc. 80mA max.
4-20mA power 8-35Vdc. 22mA
4 Wire System
Diagram 5.4.1
3 Wire System

TVOC MANUAL Ion Science Ltd
Page 13 of 28
5 Installation
WARNING!
The label on the enclosure details the IS and nA certifications. The appropriate section of the ATEX label
should be covered up or blocked out to reflect the type of installation. For Non ATEX applications the label
should be covered completely. For ATEX zone 2 applications with out safety barriers the ia certification
details should be blanked out. For Zone 1 or 2 IS applications with safety barriers the nA certification details
should be covered.
This will prevent safety discrepancies and or mis-use in the future should the equipment be moved or the
site be re-defined as a hazardous area.
5.4.2 ATEX nA (Non sparking) applications for Zone 2 areas only: Entry parameters
Input power 5 to 24Vdc 80mA max
4-20mA power 8-35Vdc. 22mA
For information only please see ATEX certificate before installation
The wiring of ATEX nA systems is identical to the wiring showing for non ATEX applications. The only
difference is the requirements to ensure that the power supplied used provides 24v or less in normal
operation.
5.4.3 Intrinsically Safe (IS) applications: Entry parameters
Input power Ui = 18V Ii = 800mA Pi = 1.2W Ci = 0F Li = 0mH
4-20mA power Ui = 30V Ii = 200mA Pi = 1.2W Ci = 0F Li = 0mH
For information only please see ATEX certificate before installation
Ion Science Ltd suggest using the following Zener Barriers for IS approved applications. Use competent
installation engineers and ask them for installation and application advice.
POWER SUPPLY: Suggested barriers for INLET power supply
Manufacturer Manufacturers pt no. Type Cable length estimate
Pepperl+Fuchs Z715 Zener barrier ~ 1115 meters
Pepperl+Fuchs KFD0-SD2-EX1.1065 Galvanic isolator ~ 1217 meters
MTL 7715P+ Zener barrier ~ 772 meters
Stahl 9901/01-158-270-101 Zener barrier ~ 500 meters
Stahl 9143/10-156-065-10 Galvanic isolator
SIGNAL OUTPUT: Suggested barriers for 4-20mA OUTLET
Manufacturer Manufacturers pt no. Type
Pepperl+Fuchs Z728 Zener barrier
Pepperl+Fuchs KFD2STC4-Ex1 Galvanic isolator
MTL MTL7787 Zener barrier
MTL MTL5042 Galvanic isolator
Stahl 9001/01-280-110-141 Zener barrier
Stahl 9160/13-11-11 Galvanic isolator
NOTE
All cable lengths are estimated for zone 1 IIC installation of the equipment
Using 1mm2C.S.A conductor S.T.P cables with capacitance per meter of 250pF/m, L/R ratio of
25uH/conductor resistance at 20C of 18.4/km.
Calculation assumes cables are at 50C.
WARNING! Intrinsically Safe (IS) applications
Units should not be powered using non IS power supplies prior to installation in an IS application.
If non IS power is supplied the unit will require inspection by Ion Science Ltd or an Ion Science
Approved Service Centre prior to installation in an IS application.
TVOC fuses may not be replaced in the field.
If a fuse is blown TVOC will require inspection by Ion Science Ltd or and Ion Science Approved Service
Centre before it is used in an IS application

TVOC MANUAL Ion Science Ltd
Page 14 of 28
5 Installation
Diagram 5.4.3.1 4-wire Control equipment sensing 4 –20 mA on return line
Notes:
For intrinsically safe installations, the enclosure may be opened while the system is live,
provided the work is undertaken by competent personal and suitable safety precautions
are taken. This overrides the warning on the enclosure label.
5.5 Initial calibration
TVOC is calibrated at Ion Science before dispatch using 100ppm Isobutylene. However if you wish to
calibrate your TVOC once it is installed Ion Science recommends that the TVOC is left to run on its chosen
settings (see page 9TVOC Set up) for 24 hours before an initial calibration is carried out, to allow the
instrument to settle into the working environment.

TVOC MANUAL Ion Science Ltd
Page 15 of 28
6 Operation
6.1 Start Up
After electrical power is connected, TVOC runs through a ‘Start up’ routine, which lasts for approximately 1
minute. During this ‘Start up’ routine TVOC demonstrates the following characteristics:
* The LCD screen displays the software version number
* The GREEN LED flashes
* The 4 –20 mA output is set to 4 mA (0.0 ppm)
NOTE: If the 0-10ppm range is selected the TVOC will require calibration using 10ppm Isobutylene before
user (See the calibration section of this manual)
During this ‘Start-up’ time the user can adjust the lamp OFF time as referred to on page 10. This time can be
adjusted from 0 to 5 minutes in 1 second increments.
6.2 Cycle times
To extend PID lamp life and the time between servicing, TVOC includes a
variable duty cycle, (see section 4.2) whereby the lamp is switched ON
and OFF. The length of time between servicing and calibration is
increased where longer OFF times are selected. However the length of
time between servicing also depend on ambient air quality, the higher
VOC concentration detected by the instrument then the shorter the time
between servicing.
6.2.1 Adjusting the lamp OFF time
There are two stages to adjusting the lamp OFF time. The first stage adjusts the seconds (0-59) and the
second stage adjusts the minutes (0-5). To adjust the lamp OFF time the magnetic switch must be activated
during the ‘Start-up’ time.
NOTE: Please read this entire procedure before attempting to adjust the lamp OFF time.
1 –During the 1 minute ‘Start up’ routine place the calibration magnet over the top
right hand corner of the Ion Science logo. Two numbers on the LCD screen will flash.
2 - This indicates the lamp OFF time in seconds.
3 –Placing the calibration magnet back over the logo will cause the number to role between 0 and 59
seconds. Remove the magnet when the desired time is displayed.
4 –After 5 seconds the display will show another two numbers and flash.
5 –This indicates the lamp OFF time in minutes.
6 –Again place the calibration magnet over the logo to rotate the numbers between 0
and 5 minutes. Remove the magnet when the desired time is displayed.
7 - After 5 seconds the entire output frequency is displayed.
8 - After a further 5 seconds the set frequency will be set in the
TVOC memory.
9 - TVOC then continues through the standard start-up routine.
If you are unhappy with the update frequency you have set you can adjust the time by placing the
calibration magnet over the logo during the 5 seconds after the total time has been shown (point 8 above).
NOTE: The total duty cycle time includes the 5 seconds lamp ON time. Therefore if you wish your total duty
time to be approximately 2 minutes set the lamp OFF time to 1 minute 55 seconds.
At the end of the ‘Start up’ routine TVOC will enter the selected monitoring routine.

TVOC MANUAL Ion Science Ltd
Page 16 of 28
6 Operation
6.3 LED’s
The GREEN LED indicates TVOC’s working status
ON Indicates the PID lamp is OFF
Flashing Indicates the PID lamp is ON
The RED LED indicates Fault status
ON Indicates TVOC cannot function correctly. The 4-20mA output drops
to 3.5mA.
URGENT attention is required.
Flashing Indicates the last calibration carried out was outside expected
limits. The instrument will continue working but service is required.
Please see Section 7 Calibration for YELLOW LED status.
6.4 Selector pins
TVOC has a range of options that are selected via the selector pins on the back of the main PCB (please see
page 9TVOC Set up).
The options are shown below with the defaults highlighted in bold:
1-1000ppm or 0.01 - 10 ppm or 0.1 - 100 ppm
ppm units or mg/m3units
6.5 Calibration mode
TVOC calibration mode can be accessed using the calibration
magnet supplied in the TVOC calibration tool kit (Part number:
A-845214).
To enter calibration place the magnet over the top right of the
Ion Science Logo until the state changes (i.e. an LED illuminates
and/or the display changes).
Ensure the magnet is withdrawn away from the magnetic switch
by at least 1 cm once a change has occurred.
6.6 Calibration gases
TVOC has three (3) ranges that can be selected however the 0-10ppm range requires the instrument is
calibrated by the user before use. The 0-100ppm and the 0-1000ppm ranges can initially run using the
Factory calibration carried out during the instruments manufacture, however because the 0-10 ppm range is
more sensitive and more susceptible to environmental and system tolerances the instrument must be
calibrated before use.
If the 0-10 ppm range is selected TVOC will display the following
screen to indicate that a calibration is required before it can be used.
Follow the calibration instructions before use.

TVOC MANUAL Ion Science Ltd
Page 17 of 28
7 Calibration
7.1 Calibration routine
Ion Science recommends calibrating TVOC after any maintenance or lamp cleaning is carried out and on a 3
monthly basis to ensure TVOC is working to specification.
NOTE: Please read this entire calibration procedure before attempting a calibration.
TVOC calibration has 4 stages:
1. Setting the ZERO (Using clean gas via carbon filter)
2. Setting the gas tolerance (1 –200 ppm Isobutylene on 0-100 ppm and 0-1000 ppm ranges)
(1 - 100 ppm Isobutylene on the 0-10ppm range)
3. Setting the SPAN (Using the SPAN gas)
7.2 Setting the ZERO
1 –Place the calibration magnet over the top right hand corner of the Ion Science logo to enter
calibration mode. The ZERO LED will illuminate and the GREEN STATUS LED will extinguish.
2 –Remove the calibration magnet
3 –Insert the calibration adaptor into the sensor cap, attach the carbon filter to the calibration
adaptor. The carbon filter should be attached to the hand aspirator.
4 –Again place the calibration magnet over the logo. The ZERO LED will flash, during this stage TVOC
displays a direct milivolt (mV) output from the PID sensor.
GREEN
STATUS LED
ZERO LED
SPAN LED
FAULT LED
Calibration adaptor
Carbon filter
Hand
aspirator

TVOC MANUAL Ion Science Ltd
Page 18 of 28
7 Calibration
5 - Slowly and repeatedly squeeze the hand aspirator to push clean air through the carbon filter and
past the PID sensor. The ZERO LED will stop flashing after approximately 2 minutes.
6 –Now remove the equipment except for the calibration adaptor.
NB During the Zeroing process the mV reading on the display must reduce to below 30 mV to pass the ZERO
calibration stage.
An acceptable ZERO calibration level will result in the illumination of the GREEN LED.
An unacceptable ZERO calibration level will result in the illumination of the RED LED. Should this occur
the previous zero calibration level will be used.
7.3 Setting the gas tolerance
1 –Now, again place the calibration magnet over the corner of the logo -
The GREEN or RED LED will be extinguished and the numeric display
will start to flash .
2 - If the 0-10ppm range is selected you will be able to adjust between 1.0 ppm and 100ppm, for both
the 100 ppm and 1000 ppm ranges a tolerance of between 1 and 200 ppm can be selected. Leaving
the magnet in position will cause the displayed number to cycle through the tolerance, remove the
magnet when the displayed value matches that stated on the Calibration gas bottle. Should you miss
the desired reading quickly reapply the magnet to continue scrolling through the numbers and
remove the magnet at the desired figure.
The selected number will be recorded 5 seconds after the removal of the magnet when the display
stops flashing. The display will initially show 90, should this be the desired figure remove the magnet
straight away.
7.4 Setting the SPAN
1 - Connect the SPAN gas to the calibration connector then the connector to the adaptor. Do not over
tighten the Luer fitting; only a ¼ turn is required.
Switch on the gas supply and then place the magnet over the logo.
The SPAN LED will flash and TVOC will display the direct millivolt (mV) output from the PID sensor.
Now remove the magnet.
2 - The SPAN LED will stop flashing after approximately 2 minutes.
3 –Turn off the gas and disconnect the equipment
Calibration adaptor
SPAN gas
Calibration connector

TVOC MANUAL Ion Science Ltd
Page 19 of 28
7 Calibration
An acceptable SPAN calibration level will result in the illumination of the GREEN LED.
An unacceptable SPAN calibration level will result in the illumination of the RED LED. Should this occur the
previous span calibration level will be used.
Now place the magnet over the logo corner to return to normal monitoring routine.
The GREEN LED will start flashing as TVOC starts its cycle with a lamp ON cycle.
If either the ZERO and/or SPAN levels where outside acceptable levels the RED LED will flash until an
acceptable calibration has been carried out.
Unacceptable calibration levels will NOT be used, TVOC will default to the previously stored acceptable
calibration factor.
NOTE:
* Always check the accuracy of your calibration by checking readings from TVOC when it is running
normally using the ZERO filter and SPAN gas.
* Accuracy of calibration is the responsibility of the person carrying out the calibration. If in doubt seek
advice.
* TVOC must be calibrated after lamp/cell cleaning or general maintenance.
NOTE: Causes of contamination and error in signal:
* Changes in air pressure when detecting ppm concentration
* Variation in Oxygen and / or Argon beyond ambient levels.
* Variation in ambient moisture content.

TVOC MANUAL Ion Science Ltd
Page 20 of 28
8 Maintenance
Cleaning / replacing the lamp
TVOC has been designed to ensure servicing is quick and easy:
1. Before servicing TVOC ,
disconnect the electrical
power supply.
2.Remove the Locking Screw
from the Metal Sensor Cap
using the Allen Key
supplied within the
Calibration tool kit.
(Calibration tool kit part number
A-849214)
WARNING:
Failing to remove the locking
screw before unscrewing the
Sensor Cap will damage the
sensor holder.
3. Unscrew the sensor Cap
to access the PID sensor.
4. Remove the PID Sensor
by withdrawing it from
the Sensor Housing. Only
light force is required
WARNING:
Do not twist the PID Sensor while
it is within the Sensor Housing
Sensor Cap
Locking Screw
PID Sensor
Sensor Housing