- 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.

Low power

  • IREX consumes less than 1W of power - ensures compatability with a wide range of control systems


  • Independantly tested for reliability and performance in harsh offshore conditions by Micropack Engineering Ltd - demonstrates IREX will operate dependable in any application
  • 3rd party approval to the performance standard EN60079-29-1
  • Employs sophisticated systems and algorithms - ensures reliable operation at all times
  • T90 response time of less than 4 seconds - rapid indication of hydrocarbon gas hazards
  • Optical components are treated with a STAY-CLIR coating - prevents partial obscuration in condensing atmospheres

Easy to maintain

  • No adjustments are necessary at the detectors, zero and span adjustments (if required) are performed at the control panel only - saves significant time and cost
  • Test can be applied remotely via a tube to the standard weather cover
  • Sinter-free operation - unlike a pellistor sensor, there is no risk of a sinter becoming blocked
Crowcon Detection Instruments Ltd - a Halma company
Crowcon Detection Instruments Ltd - a Halma company
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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