Crowcon IREX Infrared Pellistor Gas Detector




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Crowcon IREX Infrared Pellistor Gas Detector

The IREX concept enables pellistor-based gas detection systems to be upgraded to dual-wavelength IR gas detector technology without incurring the very significant costs associated with upgrading the control system and re-installation.

IREX is an innovative infrared (IR) flammable gas detector designed specifically to directly replace pellistor (catalytic bead) type flammable gas detectors. IREX operates from control systems designed solely for use with pellistor-based gas detectors: it produces a mV Wheatsone Bridge type signal (as per a pellistor) and operates from as little as 2.9Vdc.

IREX can be directly connected to a control system or can be supplied with an M20 ‘spigot gland’ enabling originally installed detector junction boxes and cables to be retained. Pellistor sensor technology has provided effective flammable gas detection at low cost for many years.

Key Features:

  • IREx consumes less than 1W of power – Ensures compatibility with a wide range of control systems
  • Independently tested for reliability and performance in harsh offshore conditions – Demonstrates IREX will be operated dependably 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-CLIP coating – Prevents partial obscuration in condensing atmospheres
  • No adjustments are necessary at the detectors, zero and span adjustments are performed at the control panel only
  • Test can be applied remotely via a tube to the standard weather cover – Saves significant time and cost
  • Sinter free operation – Unlike a pellistor sensor: there is no risk of a sinter becoming blocked



Crowcon gas detectors (portable and fixed) are suitable for applications in many industries and for detecting a wide variety of dangerous gases – protecting people and plant from gas risks (toxic and flammable) in both industrial and hazardous areas with IECEx and ATEX certification. Portable product range: Gas-Pro, Gas-Pro IR, Gas-Pro PID, Gas-Pro TK, T4, Tetra 3, Gasman, Clip SGD, Detective+, Detective Wireless, LaserMethane Mini, Triple Plus+ Fixed product range: XgardIQ, IRmax, Xgard Bright, Xgard, TXgard-IS+, Flamgard Plus, TXgard Plus, Open Path Gas Detectors, FGard IR3 Flame Detector, Xsafe, F-Gas Detector


IREX Specifications

Size 120 x 55 x 130mm (1.7 x 5.1 x 3.3ins) (with spigot gland)
Weight 1.5kg (10.8oz)
Ingress protection IP66
Enclosure material 316 stainless steel
Power 800mW nominal
Connection Supplied either with M20 spigot gland for insallation into existing junction boxes or with one M20 cable gland entry
Operating voltage and current 3Vdc nominal (2.9-3.2Vdc)
260mA nominal (260-280mA)
Electrical output 3-wire mV (Wheatstone) Bridge. Typically 10-20mV per % vol. methane
Operating temperature -40°C to +75°C
Humidity 0 to 100% RH non-condensing
Repeatability +/- 2% FSD
Zero drift +/- 2% FSD per year maximum
Response time T-90 <4 seconds
Performance Tested in accordance with EN60079-29-1
Functional safety Validation to IEC61508 SIL 2
Approvals II 2 G Exd IIB + H2 T6 (-40 to +50°C) T4 (-40 to +75°C)
EMC compliance EN 50270, FCC, ICES-003




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