Crowcon`s (UK) innovative new IREX infrared (IR) flammable gas detector is designed to replace pellistor (catalytic bead) type flammable gas detectors, resulting in faster response times and greatly reduced zero
drift. Capable of detecting methane, butane, propane and many other
hydrocarbons, IREX is specifically designed for the oil, gas and petrochemical industries.
Pellistor and some other IR type gas detectors are fitted with sinters (flame arrestors) to achieve Exd flameproof certification. Sinters slow response time significantly and can become blocked by contaminants, a frequently underestimated problem. Using an IREX detector results in a T90 response time of less than seven seconds, comparable with the most expensive conventional IR gas detectors. Excellent zero stability is also achieved, with none of the drift issue associated with pellistors
and cables.
Because IREX operates from the same control systems as pellistor-based detectors, it allows existing pellistor-based systems to be
easily upgraded without any of the costs associated with installing a new control system. IREX produces a mV Wheatstone Bridge type signal (identical to a pellistor) and operates from as little as 2Vdc. In
addition, it is supplied with a M20 type fixing, allowing originally installed detector junction boxes and cables to be retained.
Sophisticated systems and algorithms ensure reliable operation of IREX at all times, with no adjustments ever necessary to the detector itself. Zero and span adjustments (if required) are performed at the control panel, and gas response tests and calibration can also be done remotely, with test gas is simply applied via a tube to the standard weather cover.
IREX is designed to provide over 10 years reliable operation, and as there are no sensors which need replacing and because routine testing requirements are minimised, operating costs during its entire lifetime
are minimal.
Manufactured from 316 stainless steel, IREX has both ATEX and IECEx approval and is undergoing assessment for IEC61508 SIL 2 compliance.
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