ion science TVOC User manual

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
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
EC Type Examination Certificate(s)
Baseefa05ATEX0277 latest supplement Baseefa03ATEX742/2 issued 24th November2008
IECEx BAS 06.0057 latest revision no.1 issued 20th November 2008
Standards
BS EN 60079-0:2006 Electrical Apparatusfor 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 formeasurement, 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, toxicgases 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 specificationfor 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 thisdeclaration is
placed on the market, the product conforms to all technical and regulatory requirementsof the above listed
directives.
Name: MarkStockdale Position: Technical Director
Signature: Date: 20th November2008

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
Cycle times . . . . . . 9
5 –Installation . . . . . . 10
Location . . . . . . 10
Mounting . . . . . . 11
Cable 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
Cycle times . . . . . . 17
LED’s . . . . . . . 18
Selector pins . . . . . . 18
Calibration 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
Cleaning 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
Page 5 of 32
1 Statements
Responsibility for use
TVOC detects a large range of gases, which are potentially dangerous from both a poisoning and/or an
explosive perspectiv e. 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) directiv e. Ion
Science Ltd offers a take back serv ice. Please contact us for more information.
Contact Ion Science Ltd
By Post Ion Science Ltd
The W ay
Fowlmere
Cambridge
SG8 7UJ
UK
By Telephone +44 ( 0) 1763 208503
By Fax +44 ( 0) 1763 208814
By Email [e-mail]

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 from 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 takes a
measurement. Duty cy cles are explained in more detail in section 4, TVOC set up, and section 6 Operation.
IMPORTANT: if the 10ppm range is selected the TVOC 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 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 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 Calibration for information. TVOC
calibration mode is accessed v ia a magnetic read switch system.
The TVOC intrinsic safety rating permits its deployment in all hazardous areas of the quoted (or less
demanding) rating. That is, in areas where explosive 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
Page 7 of 32
3 Packing List
All items of equipment shipped by Ion Science Ltd are pack ed 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. 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 8 of 32
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 PC B. 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.
Diagram 4.1
Diagram 4.2
Diagram 4.3

TVOC MANUAL Ion Science Ltd
Page 9 of 32
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) aaa1000 ppm (Default)
a(n/a) axa100 ppm
a(n/a) xaa10 ppm
a(n/a) aax2280 mg/m3
a(n/a) axx228 mg/m3
a(n/a) xax22.8 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 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.
Alway s ensure power is disconnected from TVOC before changing
setting or carry ing 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 section 6.1 of this manual for full instructions.

TVOC MANUAL Ion Science Ltd
Page 10 of 32
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 lik ely 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 in areas that are easily accessible for servicing.
·Percentage v ariations in the composition of air (78% Nitrogen, 21% Oxygen and 1% Argon) may
affect the detected signal.
Please refer to the technical spe cifications of the instrument i n Section 10 of this manual before
beginning a TVOC installation.