Crowcon IREX Gas Detector (Infra Red)

Crowcon IREX Gas Detectors

Crowcon IREX Gas Detector – call T&D Sales for price, delivery and stock.

The Crowcon IREX fixed gas detector is an infrared (IR) flammable gas detector which is designed specifically to replace pellistor (catalytic bead) type flammable gas detectors.

The IREX gas detector operates from control systems designed solely for use with pellistor-based gas detectors and produces a mV Wheatstone Bridge type signal and operates from as little as 2.9Vdc.

IREX fixed gas detectors replace old pellistor heads by simply mounting on the original junction box and connecting to the original cable.

The IREX concept enables upgrades to dual-wavelength IR gas detector technology without incurring the very significant costs associated with replacing the control system and re-installation.

IREX fixed gas detector consume less than 1W of power ensuring compatibility with a wide range of control systems and are dependable with T90 response times of less than 4 seconds, providing a rapid indication of hydrocarbon gas hazards.

The IREX fixed gas detector is also water and dust resistant to IP66. Crowcon IREX is a certified Flameproof (Exd) detector suitable for use in ATEX Zone 1 or Zone 2 hazardous areas.

Crowcon IREX Fixed Gas Detector – Key Features

  • IR Technology – The Crowcon IREX uses IR technology instead of pellistor gas sensors which require less maintenance, don’t require oxygen, less likely to burn out and don’t need to be operated behind a sinter (flame arrestor)
  • Low Power Consumption – The IREX consumes less than 1W of power
  • Reliability – Independently tested for reliability and performance in harsh offshore conditions by Micropack Engineering Ltd and approved to EN60079-29-1
  • Maintenance – No adjustments made to the detector all are performed at the control panel and tests can be applied remotely via a tube to the standard weather cover
Crowcon IREX Gas Detector

Crowcon IREX Gas Detector – infra-red pellistor replacement flammable gas detector

Crowcon IREX Bump Testing And Calibration

Routine bump testing is recommended for the range of Crowcon fixed gas detectors prior to each use. Bump testing is a brief application of a gas to the sensor to invoke a prescribed reaction, ensuring the gas detector reacts as expected.

Bump testing provides a quick, easy and direct method of verifying gas detectors are performing as required and takes a lot less time than ‘zeroing’ the device. 

The bump test is widely accepted as a suitable method of testing gas detection equipment. 

Crowcon IREX Fixed Gas Detector – Product Specification

Size120 x 55 x 130mm (1.7 x 5.1 x 3.3 inches) (with spigot gland)
Weight1.5kg (10.8 oz)
Enclosure Material316 Stainless Steel
Ingress ProtectionIP66
Power800mW nominal
ConnectionSupplied either with M20 spigot gland for installation 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 to +75ºC
Humidity0-100% 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 +50ºC) T4 (-40 to +75ºC) ATEX & IECExATEX Gas Detector Crowcon IREX
EMC ComplianceEN 50270, FCC, ICES-003

Crowcon IREX Fixed Gas Detector – Gases And Ranges Detected

Methane (CH4)0-20, 50, 100% LEL
Acetone (C3H6O)0-100% LEL
Butane (C4H10)0-100% LEL
Ethanol (C2H5OH)0-100% LEL
Ethylene (C2H4)0-100% LEL
Ethyl Acetate (C4H8O2)0-100% LEL
Heptane (C7H16)0-100% LEL
Hexane (C6H14)0-100% LEL
LPG0-100% LEL
Octane (C8H18)0-100% LEL
Methanol (CH3OH)0-100% LEL
Pentane (C5H12)0-100% LEL
Petrol Vapour0-100% LEL
Propane (C3H8)0-100% LEL
Propylene (C3H6)0-100% LEL
THF (Tetrahydrofuran) (C4H8O)0-100% LEL
Xylene (C8H10)0-100% LEL
Methyl Acetate (C3H6O2)0-100% LEL
Propylacetate (C5H10O2)0-100% LEL
Hexene (C6H12)0-100% LEL
Paraxylene (C8H10)0-100% LEL
Ethane (C2H6)0-100% LEL
Ethylene Dichloride (EDC)0-100% LEL
Cyclohexane (C6H12)0-100% LEL
Butadiene (C4H6)0-100% LEL
Toluene (C7H8)0-100% LEL
Butene (C4H8)0-100% LEL
Hexane (C6H14)0-100% LEL
Styrene (C8H8)0-50% LEL


Crowcon IREX - Certification Label

Crowcon IREX – Certification Label

Crowcon IREX – Hazardous Area ATEX Certified Gas Detector

Hazardous Area Classification : 

II 2 G Exd IIB + H2 T6 (-40 to +50°C) T4 (-40 to +75°C) ATEX & IECEx

Crowcon IREX Gas Detector

Crowcon IREX Gas Detector

Crowcon IREX

IREX Gas Detector – optional accessories include glands, junction boxes and brackets

Visit hazardous area gas detectors for explosion and flameproof gas monitoring and detection instruments with certification for potentially explosive atmospheres, including Zone 1 and Zone 2 (according to ATEX and IECEx) and Class/Division categories (according to North American standards).

T&D provide competitive prices and delivery for all Crowcon Gas Detectors, including the Crowcon IREX.

➡ Did you know? Crowcon fixed gas detectors protect plant; portable gas detectors protect people.


T&D Sales Team are Certificated by Crowcon to support the specification and supply of their flammable and toxic gas detectors. Additionally, T&D are CompEx Certificated and competent in understanding hazardous area classifications and site requirements for the sale of explosion and flameproof equipment.

Crowcon Portable & Fixed Gas Detection