- Infra-Red Pellistor Replacement Flammable Gas Detector

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IREX - Infra-Red Pellistor Replacement Flammable Gas Detector

IREX is a sinter-free, fully featured infrared gas detector that produces a mV Wheatstone Bridge output as used on conventional pellistor based systems. IREX replaces old pellistor heads by simply mounting on the original junction box, and connecting to the original cable. The IREX concept enables upgrade to dual-wavelength IR gas detector technology without incurring the very significant costs associated with replacing the control system and re-installation.

The Problem With Pellistors

Pellistors (or Catalytic Beads) have been the flammable gas sensor of choice for oil and gas applications and general industry. Pellistors do however have several technical limitations:

  • They do not fail safe: pellistors are easily poisoned by substances such as silicones, sulphur and lead, rendering them insensitive to gas.
  • Pellistors must be operated behind a sinter (flame arrestor) which may become blocked, thus preventing gas from reaching the sensor.
  • Pellistors are high maintenance: sensors must be regularly tested with gas to ensure they are operational.
  • Pellistors typically last 3-5 years only.
  • Pellistors may burn-out if exposed to flammable gas concentrations above 100% LEL.
  • Pellistors need oxygen to be present to work otherwise their efficiency reduces

IREX overcomes all of these issues and delivers highly dependable and rapid gas detection with no un-revealed failures.

Crowcon Detection Instruments Ltd
Crowcon Detection Instruments Ltd
172 Brook Drive,
Milton Park , Oxfordshire; OX14 4SD


Gas detection for the oil and gas industry

Supported by the global reach of its mature and dedicated distributor network, Crowcon has an enviable track record in the oil and gas industries. Read on to learn more about the applications, challenges and gas detection solutions typically seen in this demanding industry, or learn about how Crowcon recently helped Indian company Cairn Energy at their Mangala oil and gas processing facility. 


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