IR29 Di Transmitter

With display and intrinsic safety for flammable gases

If flammable gases and vapors need to be monitored in Ex zones, the IR29 Di transmitter is a reliable and robust solution. The IR29 i uses an analog (4-20 mA) signal to transmit measured values and status information. Measured values are indicated on the LC display. The connection is made 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 reliable controllers, it can be installed in new gas detection systems or retrofitted into existing ones.

The IR29 Di uses non-dispersive infrared (NDIR) sensor technology to detect combustible gases and vapors. Our patented 4-beam and 4-wavelength technology with gold-plated mirror optics, which do not require any beam splitters, is used to ensure selective measurement results without false alarms. The installed infrared sensors enable measurements above the lower explosion limit (LEL), do not require oxygen and are not susceptible to sensor poisons. The long-life sensors make the IR29 Di a permanently reliable solution for detecting a wide range of combustible gases and vapors in the measuring range of 0 to 100 % LEL. Its automatic temperature compensation and the linearization of the measurement signals ensure high measurement accuracy.

Communication and service
The IR29 Di communicates on the 4-20 mA industry standard signal. Two status LEDs are used to indicate its operation status. The LC display indicates the current measured gas concentration. Depending on the installation location, you might also be interested in the rotating version. Service and adjustments can be carried out on site using the optional RC2 remote control or the RC3 IR remote control (one-person adjustment). The IR29 Di's self-monitoring feature increases instrument safety between maintenance intervals. Test gases for function tests and adjustments can be inserted using a calibration adapter.

Safety and instrument protection
The IR29 Di is ATEX-certified for use in Ex zone 0. It complies with the intrinsic safety "i" standard, which is required for use in numerous industrial plants and in mining. The V4A stainless steel and poly-carbonate housing is protected against ingress of dust and water (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
  • Intrinsically safe
  • Not susceptible to sensor poisons
  • Expected sensor lifetime: 6 years
  • Color display (optional: rotatable)
  • Signal transmission: 4-20 mA
  • Protection class: IP67 (with rotatable display: IP40)
  • 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 housing, flow 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
» more

Weatherproof housing

Weatherproof housing for various transmitters
» more

Test gases

Find an overview of our test gases here
» more

Accessories IR29 Di

Find the complete list of accessories for the IR29 Di here
» download PDF

Our experts are happy to answer your questions! How to find us