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Crowcon IREX Infrared Fixed Gas Detector



IREX is a fast response sinter-free, fully featured infrared gas detector that produces an mV Wheatstone Bridge output as used on conventional pellistor based systems.

Designed to allow easy upgrading of existing pellistor based fixed point gas detectors.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.

IREX Overview

IR Technology versus Pellistor

Pellistors do not fail safeSensors can be ‘poisoned’ and rendered insensitive to gas by silicones, lead, sulphurs and chlorinated compounds.
Pellistors are high maintenanceSensors must be regularly tested with gas to ensure they are stilloperational. Sensors typically last 3-5 years, after which they must beexchanged.
Pellistors must be operated behind a sinter (flame arrestor)Sinters may become blocked, thus preventing gas from reaching thesensor.
Pellistors may burn outIf exposed to gas concentrations in excess of 110% LEL.
Pellistors need oxygenTheir ability to detect gas reduces significantly in oxygen deficientatmospheres.

IREX Feature

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


IREX Specifications

Size120 x 55 x 130mm (1.7 x 5.1 x 3.3ins) (with spigot gland)
Weight1.5kg (10.8oz)
Ingress protectionIP66
Enclosure material316 stainless steel
Power800mW nominal
ConnectionSupplied either with M20 spigot gland for insallation into existing junction
boxes or with one M20 cable gland entry
Operating voltage and current3Vdc nominal (2.9-3.2Vdc)
260mA nominal (260-280mA)
Electrical output3-wire mV (Wheatstone) Bridge. Typically 10-20mV per % vol. methane
Operating temperature-40°C to +75°C
Humidity0 to 100% RH non-condensing
Repeatability+/- 2% FSD
Zero drift+/- 2% FSD per year maximum
Response timeT-90 <4 seconds
PerformanceTested in accordance with EN60079-29-1
Functional safetyValidation to IEC61508 SIL 2
ApprovalsII 2 G Exd IIB + H2 T6 (-40 to +50°C) T4 (-40 to +75°C)
EMC complianceEN 50270, FCC, ICES-003






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