IR29 Transmitter

Ex-proof IR transmitter for combustible gases and CO2

If flammable gases and vapors or carbon dioxide are to be monitored in Ex zones, the IR29 transmitter is a reliable and robust solution. The IR29 transmits measured values and status displays in analog (4-20 mA). Gases are monitored either on-site by diffusion or via unpressurized gas supply with a flow adapter. In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The IR29 uses non-dispersive infrared (NDIR) sensor technology to detect combustible gases and vapors as well as carbon dioxide. For selective measurement results without false alarms, our patented 4-beam and 4-wavelength technology with gold-plated mirror optics is used, which dispenses with beam splitters altogether. The infrared sensors used also enable measurements above the lower explosion limit (LEL), do not require oxygen and are insensitive to sensor poisons. The long-life sensors make the IR29 a permanently reliable solution for detecting a wide range of combustible gases and vapors in the 0 to 100 % LEL measuring range, as well as CO2 in the 0 to 10 % vol. measuring range. Automatic temperature compensation and linearization of the measurement signals ensure high measurement accuracy.

Communication and service
Signal transmission is according to the 4-20 mA industry standard. Operating states are indicated by the transmitter via two status LEDs. Service and adjustments are carried out on site using the optional RC2 remote control (one-man adjustment). Self-monitoring of the IR29 increases device safety between maintenance intervals. Measured values and events are automatically recorded by the transmitter in an internal ring buffer. Test gases can be added for function control and adjustment with a calibration adapter.

Safety and instrument protection
The IR29 is ATEX-certified for use in Ex zone 1. It complies with the increased safety "e" and encapsulation "m" standards. The housing made of V4A stainless steel and poly-carbonate is protected against ingress of dust and water (protection class: IP67). Accessories include a guard plate and dust filter.


Key features at a glance:

General information:

  • Measuring principle: infrared (IR)
  • for combustible gases and vapors, carbon dioxide
  • insensitive to sensor poisons
  • expected sensor lifetime: 6 years
  • signal transmission: 4-20 mA
  • protection class: IP67
  • integrated data logger

Approvals / Certifications:

  • ATEX certification: II 2G Ex eb mb ib [ib] IIC T4 Gb

Optionally available:

  • pressure and humidity sensors, ex-proof control unit RC2, impact protection, flow adapter, calibration adapter, protection plate, dust filter, weatherproof housingflow adapter

Detectable gases

LEL combustible gases
C2H2 Acetylene
C2H4 Ethylene
C2H6O Ethanol
C3H8 Propane
C3H8O n-Propanol
C4H10 n-Butane
CH4 Methane
CO2 Carbon dioxide
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 IR29

Accessories IR29

Here you'll find the complete list of accessories for the IR29
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