IR22 Transmitter

Transmitter with infrared sensor for flammable gases and carbon dioxide

If carbon dioxide or flammable gases are to be monitored outside Ex zones, the IR22 transmitter is a reliable and economical solution. The IR22 transmits measured values and status displays analogue (0.2-1 mA or 4-20 mA) or digitally (RS-485). In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The IR22 uses an infrared sensor (IR) to detect carbon dioxide and the combustible gases methane and propane. The long-life sensors make the IR22 an economical solution for detecting gases in measuring ranges such as 0 to 10,000 ppm, 0 to 100 LEL or 0 to 50 % by volume. Automatic temperature compensation and linearisation of the measuring signals ensure high measuring accuracy.

Functional safety and device protection
The hardware of the IR22 complies with the European Standard for Functional Safety DIN EN 61508-2: 2011 (SIL). The housing is protected against the ingress of dust and water (protection class: IP54). An optional weatherproof housing provides additional protection.

Communication and service
Signals are transmitted according to the analogue industrial standard (optionally 0.2-1 mA or 4-20 mA) or via the digital RS-285 interface (Modbus protocol). The transmitter indicates operating states via two status LEDs. Service and adjustments are carried out on site using the optional RC22 remote control (one-man adjustment). Test gases can be applied for function control with a calibration adapter.

Key features at a glance:

General information:

  • measuring principle: Infrared (IR)
  • for carbon dioxide and flammable gases
  • expected sensor lifetime: > 5 years
  • signal transmission: 0.2-1 mA / 4-20 mA / RS-485
  • protection class: IP54

Approvals / Certifications:

  • SIL 1/2 (hardware)

Optionally available:

  • RC22 operating unit, weatherproof housing, calibration adapter

Detectable gases

CH2F2 Difluormethane/R32
  0 to 100 % LEL
0 to 14,0 % by volume
CH4 Methane
  0 to 100 % LEL
0 to 5,0 % by volume
CO2 Carbon dioxide
  0 to 1,0 % by volume
0 to 5,0 % by volume
0 to 10,0 % by volume
0 to 25,0 % by volume
0 to 50,0 % by volume
C3H8 Propane
  0 to 100 % LEL
0 to 2,0 % by volume
Other gases on request.


Extensions and accessories

Weatherproof housing

Weatherproof housing

Weatherproof housing for various transmitters
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Test gases

Test gases

You can find an overview of our test gases here
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Accessories IR22

Accessories IR22

Here you'll find the complete list of accessories for the IR22
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