CS22 Transmitter

Transmitter for monitoring ammonia and refrigerants

If toxic and flammable gases and vapours are to be monitored outside Ex zones, the CS22 transmitter is a reliable and economical solution. The CS22 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 CS22 uses chemosorption (CS) to detect combustible and toxic gases such as ammonia, methane and many refrigerants. The long-life sensors make the CS22 an economical solution for detecting a wide range of gases in measuring ranges such as 0 to 5,000 ppm, 0 to 100 LEL or 0 to 1 % by volume. Automatic temperature compensation and linearisation of the measurement signals ensure high measurement accuracy.

Functional safety and device protection
The hardware of the CS22 complies with the European Functional Safety Standard 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: Chemosorption (CS)
  • for toxic and flammable gases and vapours
  • expected sensor lifetime: 5 years
  • signal transmission: 0.2-1 mA / 4-20 mA / RS-485
  • protection class: IP54

Approvals / Certifications:

  • SIL 2/3 (hardware)

Optionally available:

  • RC22 operating unit, weatherproof housing, calibration adapter

Detectable gases

n-Hexane 0 to 100 % LEL
R-23 0 to 1000 ppm
R-1234yf 0 to 1000 ppm
R-1234ze 0 to 1000 ppm
R-134a 0 to 1000 ppm
0 to 2000 ppm
0 to 5000 ppm
R-404A 0 to 1000 ppm
0 to 2000 ppm
R-407C 0 to 1000 ppm
R-410A 0 to 1000 ppm
R-438A 0 to 1000 ppm
R-448A 0 to 1000 ppm
R-449A 0 to 1000 ppm
R-454B 0 to 1000 ppm
0 to 2000 ppm
R-507[A] 0 to 1000 ppm
R-717 (ammonia) 0 to 300 ppm
0 to 1000 ppm
0 to 3000 ppm
0 to 1,000 % 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 CS22

Accessories CS22

Here you'll find the complete list of accessories for the CS22
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