TVOC® fixed PID Detector

For continuous VOC monitoring

TVOC is a fixed continuous PID detector for the detection and measurement of total volatile organic compounds (TVOCs). Its photoionisation detection (PID) sensor capabilities utilise advanced patented Fence Electrode technology with increased resistance to humidity and contamination.

A robust fixed PID detector, TVOC has a selectable detection range of 0 – 10 ppm, 0 – 100 ppm or 0 – 1000 ppm and is ideal for use in manufacturing and process industries where VOCs are typically present.

With a 4-20 mA analogue output, TVOC can be simply integrated into a DCS control system to provide warnings and enable control of high VOC levels in the working environment.

The instrument’s ATEX approvals enable a 3 wire TVOC system to be used in Zone 2 hazardous areas without safety barriers, whilst its ATEX and IECEx approvals allow TVOC to be used in Zone 1 hazardous areas with safety barriers.

The TVOC fixed PID detector utilises a diffusive sample technique resulting in fewer contamination issues compared to pumped systems, reducing lamp cleaning and servicing requirements.

Simple to install service and calibrate, TVOC requires no hot work permit and the PID sensor is accessible and changeable in a matter of seconds.

The TVOC is also available for use with a pumped system for applications where sample conditioning is required.

TVOC is a registered trademark of Ion Science Ltd.

See our range of leading VOC detectors with revolutionary PID sensor technology:

Fixed PID Detector

Key Features

Best available photoionisation (PID) detection

  • PID independently verified as best performing on the market
  • Range: 0 to 10, 0 to 100 or 0 to 1000 ppm from just one instrument
  • In-built humidity resistance with no need to compensate
  • Anti-contamination design for extended field operation
  • Variable duty cycle prolongs run time
  • Reliable diffusive monitoring – no pump required


  • Accurate results over all environmental conditions
  • Rugged and robust design withstands harsh environments
  • Large LCD display for clear readings
  • ATEX and IECEx approved

Ease of use

  • Simple to use – minimal training required
  • Easy access PID sensor for fast, simple servicing
  • Simple calibration procedure
  • Easily integrated into a control system

Low cost operation

  • Inexpensive consumables and parts
  • Two-year warranty when instrument registered online
Fixed PID Detector

What’s included

For more details please contact Ion Science or an Ion Science Distributor for an up to date price list.

TVOC Kit (part no. TVOSXBMX-X):

  • TVOC VOC detector instrument
  • Calibration certificate
  • Instrument Manual

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Brochures, Manual, Quick Start Guides, Software etc.

Fixed PID Detector

Technical Specification

Technical Specification


Sensor (PID) * 10.6 eV lamp with Ion Science patented Fence Electrode Technology
Hazardous Area Safety Approvals ATEX: II 3 G Ex nA IIC T4 (-40°C ≤Ta ≤ 50°C)
ATEX / IECEx: II 2 G EEx ia IIC T4 (-20°C ≤Ta ≤ 50°C)
Ingress Protection Rating Designed to IP65
Dependent on cable glands fitted sensor to IP53
Power 4-20mA requires a 8-35VDC power supply
For IS requirements 3-30 VDC power supply
Ranges 0 to 10 ppm, 0 to 100 ppm, 0 to 1000 ppm (user selectable)
Sampling Diffusion (can be pumped if required using an adaptor)
Display 7 segment, 5 digit LCD, 4 colour LED’s
Response ** Sensor – T90 <5 sec
Accuracy 0 to 100 ppm: ± 10% or ± 1 ppm (whichever is greater)
0 to 1000 ppm: ± 10% or ± 1 ppm (whichever is greater)
Linearity 0 to 1000 ppm: >75%
Calibration Magnetically accessed 100 ppm Isobutylene via calibration kit accessory
Temperature Operating: -20 to 50°C, -4 to 122°F Humidity: 0-95% RH
(non condensing)
Weight & dimensions Instrument: 1.4 kg (3.1 lb) packed: 1.6 kg (3.5 ib)
Dimensions: 188 x 126 x 78 mm (7.4 x 4.9 x 3″)
4-20 mA alarm levels Selectable 2 mA & 3.5 mA options

NB: All specifications are based upon isobutylene calibration at 20°C (68°F) 50% RH, up to 100 ppm at atmospheric pressure.
* The Fence Electrode technology referred to in this document is produced by Ion Science Ltd, and protected by patents. U.S. Patent No. 7,046,012. EP 1474681, other patents pending.
** TVOC has a variable duty cycle set to 1 minute as standard. The user can adjust this between 5 sec- onds and 5 minutes. TVOC is a registered trademark of Ion Science Ltd.


Video Support

Video Support – TVOC fixed VOC detector


The following accessories are available for the TVOC fixed VOC detector.
For further information or pricing please contact Ion Science or your local Distributor.

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