TVOC User Manual V2.6
______________________________________________
Part No 849215 www.ionscience.com
TVOC MANUAL Ion Science Ltd
Page 2 of 32
DECLARATION OF CONFORMITY
Manufacturer: Ion Science Ltd, The Way, Fowlmere, Cambridge, SG8 7UJ, UK
Produc t: TVOC
Produc t 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 (-20
o
C ≤ Ta ≤ +50oC)
Notified Body: Baseefa Ltd, 1180, Buxton, UK
EC Type Examination Certificate(s)
Baseefa05ATEX0277 latest supplement Baseefa03ATEX742/2 issued 24
th
November 2008
IECEx BAS 06.0057 latest revision no.1 issued 20th November 2008
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 61010-1:2001 Safety requirements for electrical equipment for measurement, control and
laboratory use – General requirements
Directive 2004/108EC Electrical Equipment – Electromagnetic Compatibility (EMC)
BS EN 50270:1999 Electromagnetic compatibility. Electrical apparatus for the detection and
measurement of combustible gases, toxic gases or oxygen
BS EN 61000-6-6:2001 Electromagnetic Compatibility (EMC) Generic standards. Emission standard for
residential, commercial and light industrial environments
With respect to BS EN 50270:1999, the TVOC achieves performance criteria A (the apparatus continues to operate as
intended before and after the test) except at spot frequencies where it achieves criteria B (the apparatus continues to
perform after the test but during the test a degradation of performance is seen). See technical specification for details.
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 2008
TVOC MANUAL Ion Science Ltd
Page 4 of 32
Contents Page
1 – Statements . . . . . . 5
2 – Introduction to TVOC . . . . . 6
3 – Packing List . . . . . . 7
4 – TVOC Set up . . . . . . 8
Selector pins . . . . . . 8
Cy cle times . . . . . . 9
5 – Installation . . . . . . 10
Location . . . . . . 10
Mo unting . . . . . . 11
C able requirements . . . . . 12
Power requirements . . . . . 12
Non Intrinsically Safe (IS) applications . . 12
Intrinsically Safe (IS) applications. . . 14
Initial calibration . . . . 16
6 – Operation . . . . . . . 17
Start up . . . . . . . 17
Cy cle times . . . . . . 17
LED’s . . . . . . . 18
Selector pins . . . . . . 18
C alibration mode . . . . . 19
7 – Calibration . . . . . . 20
Calibration routine . . . . . 20
Setting the zero . . . . . . 21
Setting the gas tolerance . . . . 22
Setting the span . . . . . 22
Display lamp life . . . . . 23
8 – Maintenance . . . . . . 24
C leaning and replacing the PID lamp . . . 24
Fuse rupture and replacement . . . . 27
Lamp warranty statement . . . . 27
9 – Diagnostics . . . . . . 28
10 – Spare parts . . . . . . 30
11 – Technical Specifications . . . . 31
TVOC MANUAL Ion Science Ltd
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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 serv icing 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 o f 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
By Post Ion Science Ltd
The W ay
Fowlmere
Cambridge
SG8 7UJ
UK
By T elephone +44 (0) 1763 208503
By Fax +44 (0) 1763 208814
By Email info@ionscience.com
TVOC MANUAL Ion Science Ltd
Page 6 of 32
2 Introduction to TVOC
TVOC is a fixed continuous monitor for the detection and measurement of total volatile organic compounds,
which can be dangerous fro m both a poisoning and explosive perspectiv e. 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 tak es a
measurement. Duty cycles are explained in more detail in section 4, TVOC set up, and section 6 Operation.
IMPORTANT: if the 10ppm range is selected the TVO C will require a calibration using 10ppm Isobutylene
before use.
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 giv e 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 section 7 Calibration for more information on LED status.
For installation requirements please refer to sections 5 and 10 of this manual. For Intrinsically Safe (IS)
installations please also refer to the TVOC ATEX certificate for further details. Before attempting an
installation, please fully read and understand this user manual.
TVOC does require regular calibration onsite please see section 7 C alibration for information. TVOC
calibration mode is accessed via a magnetic read switch system.
The TVOC intrinsic safety rating permits its deployment in all hazardo us areas of the quoted (or less
demanding) rating. That is, in areas where explosiv e gases (of Group IIA, IIB and IIC) are intermittently
present (Zone 1) within an ambient temperature range of -20°C and +60°C.
TVOC MANUAL Ion Science Ltd
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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. A ny 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. TVOC Manual 1
TVOC Calibration Tool Kit
Item Description Qty
1. C alibration magnet 1
2. C alibration adaptor 1
3. C alibration connector 1
4. Aspirator 1
5. C arbon filter 1
6. A llen 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
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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 o r 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 remov al of 1 selector pin.
Diagram 4.1
Diagram 4.2
Diagram 4.3
TVOC MANUAL Ion Science Ltd
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4 TVOC Setup
The following table shows the selector pin combinations and the corresponding function.
a= Selector pin fitted
r = Selector pin removed
Selector pin
A B C D Range Displayed units
a(n/a) a a a 1000 ppm (Default)
a(n/a) a x a 100 ppm
a(n/a) x a a 10 ppm
a(n/a) a a x 2280 mg/m
3
a(n/a) a x x 228 mg/m3
a(n/a) x a x 22.8 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’ - C urrently not used
IMPORTANT: if the 10ppm range is selected the TVO C will require a calibration using 10ppm Isobutylene
before use. (See the calibration section of this manual)
NO TE: * 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 v ariable 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 O FF time is fully adjustable by the user. Please see section 6.1 of this manual for full instructions.
TVOC MANUAL Ion Science Ltd
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5 Installation
5.1 Location
There are many variables inv olved 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 wo rking range.
· Do not mount TVOC where it’s subjected to rain fall, water, aerosols, mist or heavy condensation.
· Mount TVOC in areas that are easily accessible for serv icing.
· Percentage variations in the compo sition of air (78% Nitrogen, 21% Oxygen and 1% Argon) may
affect the detected signal.
Please refer to the technical specifications of the instrument in Section 10 of this manual before
beginning a TVOC installation.
TVOC MANUAL Ion Science Ltd
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5 Installation
5.2 Mounting
Dimensions for mounting TVOC are given in Diagram 5.2.1 below.
Diagram 5.2.1
NO TE: The TVOC case can be used as a template when mark ing out fixing holes but do not drill
through the fixing holes.
TVOC MANUAL Ion Science Ltd
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5 Installation
5.3 Cable requirements
Ion Science Ltd suggests using screened cables for both power in and signal out. C able screens must
be terminated at the TVOC enclosure using EMC cable glands.
5.4 Power requirements
5.4.1 Non Intrinsically Safe (Non IS) applications:
Input power 5 - 28Vdc. 65mA max.
4-20mA power 8-35Vdc. 22mA
4 Wire System
Diagram 5.4.1
3 Wire System (a)
TVOC MANUAL Ion Science Ltd
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5 Installation
3 Wire System (b)
!WARNING!
Non Intrinsically Safe (Non IS) applications
When the unit is installed with a non IS rated power supply the IS details on the front of the unit are not
appropriate for the system. The IS label should be covered up or blocked out. This will prev ent safety
discrepancies and or mis-use in the future should the equipment be moved or the site be re-defined as a
hazardous area.
TVOC MANUAL Ion Science Ltd
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5 Installation
5.4.2 Intrinsically Safe (IS) applications: Entry parameters
Input power Ui = 18V Ii = 800mA Pi = 1.2W Ci = 0mF Li = 0mH
4-20mA power Ui = 30V Ii = 200mA Pi = 1.2W Ci = 0mF 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 KFD2-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 1mm
2
C.S.A conductor S.T.P cables with capacitance per meter of 250pF /m, L/R ratio of
25uH/W conductor resistance at 20°C of 18.4W/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 pow er 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
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5 Installation
Diagram 5.4.2.1 Contro l equipment sensing 4 – 20 mA at supply rail
Diagram 5.4.2.2 Contro l equipment sensing 4 – 20 mA to 0V
Diagram 5.4.2.3 Contro l equipment sensing (3 wire)
TVOC MANUAL Ion Science Ltd
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5 Installation
5.5 Initial calibration
TVOC is calibrated at Ion Science before dispatch using 100ppm Isobutylene. However if y ou wish to
calibrate y our TVOC once it is installed Io n Science recommends that the TVOC is left to run on its chosen
settings (see Section 4 TVOC 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
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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 follow ing 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)
NO TE: I the 0-10ppm range is selected the TVO C will require calibration using 10ppm Isobuty lene 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 in Section 4.2. 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) w hereby the lamp is switched O N
and OFF. The length of time between servicing and calibration is
increased where longer OFF times are selected. However the length of
time between serv icing 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.
NO TE: Please read this entire procedure before attempting to adjust the lamp O FF time.
1 – During the 1 minute ‘Start up’ ro utine 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 O FF 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 O F F time in minutes.
6 – Again place the calibration magnet over the logo to rotate the numbers between 0
and 5 minutes. Remov e the magnet when the desired time is displayed.
TVOC MANUAL Ion Science Ltd
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6 Operation
7 - A fter 5 seconds the entire output frequency is displayed.
8 - A fter 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 y ou 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.
6.3 LED’s
The GREEN LED indicates TVOC’s working status
ON Indicates the PID lamp is OF F
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 v ia the selector pins on the back of the main PCB (please see
Section 4 TVOC 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/m3 units
TVOC MANUAL Ion Science Ltd
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6 Operation
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 ov er 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 sensitiv e and more susceptible to environmental and system tolerances the instrument must be
calibrated using 10ppm Isobutylene 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
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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.
NO TE: 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 (90 – 110 ppm Isobutylene on 0-100 ppm and 0-1000 ppm ranges)
(9 - 11ppm Isobutylene on the 0-10ppm range)
3. Setting the SPAN (Using the SPAN gas)
GREEN
STATUS LED
ZERO LED
SPA N LED
FA ULT LED
TVOC MANUAL Ion Science Ltd
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7 - Calibration
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.
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 lev el 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.
Calibration adaptor Carbon filter
Hand
aspirator
TVOC MANUAL Ion Science Ltd
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7 Calibration
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 9.0 ppm and 11.0ppm, for both
the 100 ppm and 1000 ppm ranges a tolerance of between 90 and 100 ppm can be selected.
Leaving the magnet in position will cause the displayed number to count through the tolerance,
remov e the magnet when the display ed 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 remov al of the magnet when the display
stops flashing. The display will initially show 100, should this be the desired figure remove the
magnet straight away.
7.4 Setting the SPA N
1 - Connect the SPAN gas to the calibration connector then the connector to the adaptor. Do no t over
tighten the Luer fitting; only a ¼ turn is required.
Switch on the gas supply and then place the magnet ov er 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
NB During the SPAN the displayed mV reading must reach at least 80 mV to pass the SPAN calibration
stage.
Calibration adaptor SPAN gas
Calibration connector
TVOC MANUAL Ion Science Ltd
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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 lev el 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 w here outside acceptable levels the RED LED will flash until an
acceptable calibration has been carried out.
Unacceptable calibration levels will NO T be used, TVOC will default to the previously stored acceptable
calibration factor.
NO TE:
* Always check the accuracy of your calibration by checking readings from TVOC when it is running
normally using the ZERO filter and SPAN gas.
* A ccuracy of calibration is the responsibility of the person carrying out the calibration. If in doubt seek
adv ice.
* TVOC must be calibrated after lamp/cell cleaning or general maintenance.
NO TE: 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
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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 C ap
using the Allen Key
supplied within the
Calibration tool kit.
(Calibration tool k it part number
A-849214)
WARNING:
Failing to remove the locking
screw before unscrewing the
Sensor C ap 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
TVOC MANUAL Ion Science Ltd
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8 Maintenance
5. The PID C ell’s Metal Spring
Cover can be pulled off
using moderate force. The
Electrode Stack and PID
Lamp can then be removed
by holding the PID Cell
upside down.
WARNING:
Ensure the Electrode Stack and
PID Lamp fall onto a soft surface
such as a piece of tissue. This w ill
avoid damaging the parts as they
fall out and avoids finger contact
with the PID Lamp window.
6. Clean the PID Lamp using
Alumina Powder loaded
onto a cotton bud.
Rub the Cotton Bud /
Alumina power on the
PID Lamp Window using
a circular motion until a
light audible squeak can
be heard.
NO TE:
Contamination of the Lamp
Window can considerably reduce
the detection capability of the PID
Cell, even when the contamination
is not visible.
Cleaning of the lamp should be carried out on
a regular basis depending on the duty cycle of
the PID Lamp and the environment.
Electrode
Stack
PID Lamp
Metal Spring
Cover
Alumina Powder
Cotton Bud / Alumina
Powder
TVOC MANUAL Ion Science Ltd
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8 Maintenance
The amount of humidity and quality of the ambient air will directly affect the time between serv icing.
WARNING:
Leaving contamination on the lamp window can cause irrecoverable damage to the PID Lamp.
7. The Electrode Stack should be inspected for visible signs of contamination, if contamination can be
seen the Stack it must be replaced. (The Electrode Stack part number 1/EA-02)
Reassembly:
8. Place the clean PID Lamp into the PID Cell avo iding finger contact with the Window.
9. Refit the Electrode Stack with the electrical pin holes and electrode wire racing down.
10. Refit the Metal Spring Cover.
11. Ensure the Electronic
Pins of the PID Cell are at
the 12 o’clock position
before inserting the PID
Cell.
The PID Cell should insert
into the connectors easily,
if significant resistance is
felt, remove the cell and
check alignment before
reinserting.
WARNING:
Irreparable damage will be caused by forcing the PID into the Sensor Holder if not correctly aligned.
NO TE: Always calibrate TVOC after serv icing is carried out.
Electronic Pins
TVOC MANUAL Ion Science Ltd
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8 Maintenance
Fuse rupture and replacement
TVOC has a 125 mA BASEEFA certified fuse to prov ide instrinsically safe protection when the unit is installed
in hazardous areas.
This fuse may ruptures for example due to over voltage or a current surge, if this is the case replace ment is
different depending upon the application being Intrinsically Safe or not.
For Intrinsically Safe (IS) applications the unit must be inspected and hav e the fuse replaced by Ion Science
Ltd or an Ion Science Approved Service Centre. The intrinsically safe rating is not maintained if the fuse is
simply replaced.
For Non Intrinsically Safe (Non IS) applications the fuse may be replaced by an equivalent rated fuse and
operation tested by qualified engineering personnel.
Lamp Warranty Statement
Please note: The standard warranty period for a 10.6 PID lamp is one year, providing that the default duty
cycle for lamp pulsing is used (55 seconds lamp off, 5 seconds lamp on.)
TVOC MANUAL Ion Science Ltd
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9 Diagnostics
Below are two conditions your TVOC can be in when it is work ing correctly:
The two conditions shown below are of the instrument in an error state with potential
checks/cures for these faults:
If an F1 error occurs when the instrument is first switched on there may not be an issue. The instrument
needs to be left on for a few cycles to see if the lamp strikes on its own. If ‘F1’ is still on screen after 5
minutes then look at the information below
The first thing to check is to make sure the red cable between the sensor pcb and the main pcb is securely
plugged in. If the red cable is gripped inside the case it can be pushed into the sensor housing using the
rigidity of the cable to make sure the connector is fully plugged in. Then the connector on the main pcb
should also be checked.
TVOC MANUAL Ion Science Ltd
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The notes below will require some TVOC spares:
Next thing to try is to replace the pellet with another one if available and switch the instrument on to check
(remembering that the instrument should be left on for a few minutes if F1 appears straight away ).
If the instrument still show s this error then the lamp should be replaced if available and then the PID cell
should be replaced after if it is still not cured.
If you do not hav e any spare pellets, lamps or PID cells then you will need to contact Ion Science for some
assistance if the problem remains after the in strument has completed a few minutes of run cycles and the
cable has been checked. Or alternatively if the problem remains after yo u have tried replacement parts.
___________________________________________________________________________
If an F2 error is shown on screen this generally means that ambient light is getting to the light sensor on the
sensor board.
This may be because the metal cap and PID cell have been removed from the instrument while main power
is still on or that the PID sensor has been left out when the cap has been screwed back on.
By replacing the cap and the sensor this error should go away.
In the event that the sensor and cap are both on the instrument and y et F2 is still on the display please
contact Ion Science for some assistance.
TVOC MANUAL Ion Science Ltd
Page 30 of 32
10 Spare part s
Part Description Part number
Calibration tool kit Calibration magnet, C alibration adaptor,
Calibration connector, Zero gas aspirator,
Carbon filter, 2 x Allen keys. A -849214
Flow adaptor Replaces the standard Sensor Cap
(Allows an external pump to be fitted) 849218
Fixed bump adaptor Replaces the standard Sensor Cap
(Allows an external pip connection) 849217
PID Lamp cleaning kit A lumina powder and cotton buds A-31063
Span Gas kit (100ppm) 100ppm Isobutylene (103Liters) and Flow
Regulator in a carry case A -845213
Span Gas kit (10ppm) 10ppm Isobutylene (103Liters) and flow
Regulator in a carry case 849230
PID Cell Replacement PID Sensor 1/EO-02
Carbon filter User for ZERO span A-31057
Calibration magnet User to step through calibration A -849219
Electrode stack 1/EA-02
PID lamp A -833227
TVOC MANUAL Ion Science Ltd
Page 31 of 32
11 Technical Specifications
PID Sensor W ith fence electrode technology
Lamp type 10.6eV (Krypton)
TVOC Ingress protection IP65
Sensor Ingress protection IP54
Range 0 - 10 ppm (0 - 22.8 mg/m3)
0 - 100 ppm (0 - 228 mg/m3 )
0.- 1,000 ppm (0 - 2280 mg/m3 )
Non IS applications Input power 5 – 28 Vdc. 65 mA
4 – 20 mA power 8 – 35 Vdc. 22 mA
Intrinsic safe approvals II 2 G EEx ia IIC T4 (-40 oC £ Ta £ 60 oC)
Certificate number Baseefa05ATEX0277
IS applications Entry parameters
Input power Ui = 18V Ii = 800mA Pi = 1.2W Ci = 0mF Li = 0mH
4-20mA power Ui = 30V Ii = 200mA Pi = 1.2W Ci = 0mF Li = 0mH
For information only please see ATEX certificate before installation
Zener Barrier s: Ion Science Ltd suggest using the following Zener Barriers for ATEX / IS approved
applications. Ask your installation engineers for installation and application advice.
Manufacturer Manufacturer s part number
Pepperl+Fuchs Z715
MTL 7715P+
Stahl 9901/01-158-270-101
Pepperl+Fuchs KF D2-SD-Ex1.17
Dimensions Weight
Height 181mm (7.11”) Instrument 1.3kg (2.9 lb)
Width 124mm (4.882”) Packed 1.47kg (3.2lb)
Depth 72.6mm (2.859”)
Display 7 Segment, 4 Digit LC D. 4 Colour LED’s
Response Sensor T90 < 5sec
TVOC updates the output once every 2 minutes, 5minutes or 10 minutes
Accuracy 0 - 100 ppm or 0 - 10 ppm +/- 2%
100 - 1,000 ppm +/- 5%
Linearity 0 - 100 ppm >98%
Calibration Magnetically accessed
ZERO = Carbon canister
SPAN = 100 ppm Isobutylene +/- 10%
Temperature O peration: -20oC to +50oC (-4oF to 122oF)
Humidity 0 - 95% RH (non condensing)
EMC: The F1 condition (lamp off) is triggered at heavy industrial level of radiated emissions (10V/m)
from 112MHz to 182MHz and 358Mhz to 375MHz. The instrument will recov er after the radiated
emissions hav e ceased.
TVOC MANUAL Ion Science Ltd
Page 32 of 32
Update Log
Manual Version Amendment Date updated Instrument
Firmware
PC Software
TVOC V2.2 Diagram 5.2.1
updated on
page 11
31/3/08 V3.09 N/A
TVOC 2.3 Diagram
updated on
page 15
21/4/08 V3.09 N/A
TVOC 2.4 Declaration on
conformity
change only
27/11/08 V3.09 N/A
TVOC 2.5 Log added to
back of manual
09/01/09 V3.09 N/A
TVOC 2.6 Diagnostics
added and P&F
barrier changed
20/02/09 V3.09 NA
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