IR29 i Transmitter

Intrinsically safe transmitter for flammable gases and CO2

If flammable gases and vapors or carbon dioxide are to be monitored in Ex zone 0, the intrinsically safe IR29 i transmitter is a reliable and robust solution. The IR29 i transmits measured values and status displays in analog (4-20 mA). It is connected via a safety barrier (SB1, SB1 D or Zener barrier) to prevent the ignition of power lines within the Ex zone. In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The IR29 i 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 i 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. The transmitter indicates operating states via two status LEDs. If a safety barrier with display is used, measured values and status can be read safely outside the Ex zone. Service and adjustments are performed on site using the optional RC2 remote control (one-man adjustment). Self-monitoring of the IR29 i increases device safety between maintenance intervals. Test gases can be added for function control and adjustment using a calibration adapter.

Safety and instrument protection
The IR29 i is ATEX-certified for use in Ex zone 0. It complies with the intrinsic safety "i" standard, which is required for use in many industrial and mining applications. The V4A stainless steel and poly-carbonate housing is protected against dust and water ingress (protection class: IP67). Accessories available 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
  • intrinsically safe
  • 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 1G Ex ia IIC T4 Ga

Optionally available:

  • safety barrier, 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



Two-channel safety barrier for intrinsically safe transmitters
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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 i

Accessories IR29 i

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