Onset T-ION-TVOC Operating Manual
Part number: 849215
Unrivalled Detection. www.ionscience.com
TVOC
Instrument User Manual V4.5
Part number: 849215
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TVOC MANUAL Ion Science Ltd
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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 EEx ia IIC T4 (-20oC ≤ Ta ≤ +50oC)
Notified Body: Baseefa Ltd, 1180, Buxton, UK
Identification: II 3G Ex nA IIC T4 (-40oC < Ta < +50oC)
Ion Science Ltd Self certified EC Type Examination Certificate(s)
Baseefa05ATEX0277 latest supplement Baseefa05ATEX0277/2 issued 24
th
November 2008
Ionscience09849 Examination certificate issued 4th September 2009
Ref Ion Science Cert Report 849237, 849242
International Standards
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
Ex ia IIC T4 (-20oC Ta + +50oC)
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 61010-1:2010 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 9001:2008 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
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Contents
Declaration of conformity .............................................................................................................................. 3!
Statements ...................................................................................................................................................... 5!
Responsibility for use .................................................................................................................................... 5!
Quality assurance ......................................................................................................................................... 5!
Disposal ........................................................................................................................................................ 5!
Legal Notice .................................................................................................................................................. 5!
Introduction to TVOC ...................................................................................................................................... 6!
Packing list ...................................................................................................................................................... 8!
Standard TVOC instrument ........................................................................................................................... 8!
TVOC Calibration Tool Kit ............................................................................................................................. 8!
TVOC setup ..................................................................................................................................................... 9!
Selector Pins ................................................................................................................................................. 9!
Duty Cycle ................................................................................................................................................... 10!
Installation ..................................................................................................................................................... 11!
Location ....................................................................................................................................................... 11!
Cable and gland requirements .................................................................................................................... 11!
Dimensions for mounting ............................................................................................................................ 12!
Power requirements .................................................................................................................................... 13!
Initial calibration .......................................................................................................................................... 15!
Operation ....................................................................................................................................................... 16!
Start Up ....................................................................................................................................................... 16!
Adjusting the Duty Cycle ............................................................................................................................. 16!
LED’s ........................................................................................................................................................... 17!
Selector pins ............................................................................................................................................... 17!
Calibration mode ......................................................................................................................................... 17!
Calibration gases ........................................................................................................................................ 17!
Calibration routine ....................................................................................................................................... 18!
Setting the ZERO ........................................................................................................................................ 18!
Setting the gas concentration (The actual value that the calibration has been supplied at) ....................... 19!
Setting the SPAN ........................................................................................................................................ 19!
Maintenance .................................................................................................................................................. 21!
Cleaning / replacing the lamp ...................................................................................................................... 21!
Fuse rupture and replacement .................................................................................................................... 23!
Lamp Warranty Statement .......................................................................................................................... 23!
System recommendations ........................................................................................................................... 24!
Remote area monitoring .............................................................................................................................. 24!
Gas sample systems ................................................................................................................................... 24!
Instrument warranty and service ................................................................................................................ 26!
Warranty ...................................................................................................................................................... 26!
Service ........................................................................................................................................................ 26!
Contact details ............................................................................................................................................ 26!
Diagnostics .................................................................................................................................................... 27!
F4 errors ...................................................................................................................................................... 28!
Technical specifications .............................................................................................................................. 30!
Manual log ..................................................................................................................................................... 31!
TVOC MANUAL Ion Science Ltd
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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.
Inadequate performance of the gas detection equipment described in this manual may not necessarily be
self-evident and consequently equipment must be regularly inspected and maintained. Ion Science
recommends that personnel responsible for equipment use institute a regime of regular checks to ensure it
performs within calibration limits, and that a record be maintained which logs calibration check data. The
equipment should be used in accordance with this manual, and in compliance with local safety standards.
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 ISO9001:2008, 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.
Legal Notice
Whilst every attempt is made to ensure the accuracy of the information contained in this manual, Ion Science
accepts no liability for errors or omissions, or any consequences deriving from the use of information
contained herein. It is provided "as is" and without any representation, term, condition or warranty of any
kind, either express or implied. To the extent permitted by law, Ion Science shall not be liable to any person
or entity for any loss or damage which may arise from the use of this manual. We reserve the right at any
time and without any notice to remove, amend or vary any of the content which appears herein.
TVOC MANUAL Ion Science Ltd
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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 (Photo ionisation 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 under TVOC set up, and 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:-
Calibration Ideal response Response factor Ideal calibration gas
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 disulfide 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 in calibration failure, loss of resolution or loss of range.
The default settings of TVOC are:
Detection range – 1 – 1000 ppm
Units - ppm
Signal update - 60 seconds
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. Note the 4-20 mA output must be externally powered
with 8-35 V.
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 Calibration for more information on LED status.
TVOC MANUAL Ion Science Ltd
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Introduction to TVOC
For installation requirements please refer to Installation and Technical Specification 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 Intrinsically safe 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 temperature range of -20 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 a three wire system.
TVOC does require regular calibration onsite please see the Calibration section for more information. TVOC
calibration mode is accessed via a magnetic on site switch system.
TVOC MANUAL Ion Science Ltd
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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 ten 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 (Intrinsically Safe Certified) 2
3. Blanking plug M20 intrinsically (Intrinsically Safe Certified) 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
Diagram 1
TVOC MANUAL Ion Science Ltd
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Diagram 3
TVOC setup
Selector Pins
TVOC has a number of settings that can be selected by the
user via a row of four selector pins mounted on the reverse side
of the main PCB. Diagram 2 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 four selector pins fitted as shown in
diagram 3.
Diagram 4 shows 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
! ! ! ! 1000 ppm (Default)
! ! x ! 100 ppm
! x ! ! 10 ppm
! ! ! x 2280 mg/m
3
! ! x x 228 mg/m3
! x ! x 22.8 mg/m3
Selector pin ‘B’ and ‘C’ selects the ranges - 10 ppm, 100 ppm or 1000 ppm
Selector pin ‘D’ selects the units - ppm’ or ‘mg/m3
Selector pin ‘A’ - Fault output range
NOTE: During an Alarm condition (F1 or F2) the output will drop to either 3.5 mA or 2.0 mA.
Jumper ‘A’ fitted: 3.5 mA during an alarm condition
Jumper ‘A’ removed: 2.0 mA during an alarm condition.
As default, the TVOC has a 100 ppm factory calibration
Diagram 2
Diagram 4
TVOC MANUAL Ion Science Ltd
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TVOC setup
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.
* If the jumper selection is not a recognised option then error F4 will occur. To recover switch
the instrument off perform the correct jumper selection and switch the instrument back on.
Duty Cycle
The life of a photoionization lamp is used up when the lamp is illuminated, the lamp window can also
contaminate resulting in a reduced level of detection. The TVOC pulses the lamp on and off which extends
lamp life and reduces lamp contamination. This in turn can increase the time between servicing.
The TVOC switches on the lamp, takes a reading and then
updates the 4-20 mA output and display screen. The default Duty
Cycle is the frequency between test cycles, the factory default is
set to 1 minute however this time can be adjusted from 0 to 5
minutes.
Please note: When bump testing after a calibration the response
may be delayed depending on when in the gas is applied during
the test cycle.
Fast response mode
The TVOC can be set to Fast Response Mode, when selected the TVOC will update the output every one
second. Fast response mode can be selected by setting both the seconds and minutes to zero.
Please note: The warrantee of Ion Science PID lamps is based upon a duty cycle of 1 minute. Lamps used
with Duty Cycle below one minute will not be covered under the standard warrantee terms.
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