IR22 F Transmitter

Transmitter for monitoring CO2 at up to -40 °C


If carbon dioxide is to be monitored at ambient temperatures of up to -40 degrees Celsius, the IR22 F transmitter is a reliable and economical solution. The IR22 F transmits measured values and status displays analogue (4-20 mA) or digitally (RS-485). In addition, two switching outputs enable the connection of safety measures such as buzzers or warning lights. In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The IR22 F uses an infrared sensor (IR) to detect carbon dioxide even under the harshest conditions. The long-life sensor makes the IR22 F an economical solution for detecting CO2 in the measuring range 0 to 5 vol.%. Automatic temperature compensation and linearisation of the measuring signals ensure high measuring accuracy.

Device protection
The housing is protected against the ingress of dust and water (protection class: IP65) and is suitable for applications with ambient temperatures of up to -40 °C, as they are found in cold stores, for example. An optional weatherproof housing provides additional protection.

Communication and service
Signals are transmitted according to the analogue industry standard (4-20 mA) or via the digital RS-285 interface (Modbus protocol). External alarm devices can be connected directly to the IR22 F via two transistor outputs. The transmitter indicates operating states via a status LED. Service and adjustments are carried out on site using the optional RC22 remote control (one-man adjustment). Test gas can be applied for function control with a calibration adapter.


Key features at a glance:


General information:

  • measuring principle: Infrared (IR)
  • for carbon dioxide
  • temperature range: -40 °C to +60 °C
  • expected sensor lifetime: > 5 years
  • signal transmission: 4-20 mA / RS-485
  • protection class: IP65

Optionally available:

  • RC22 operating unit, weatherproof housing, calibration adapter

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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 F

Accessories IR22 F


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