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Crowcon IRmax Infrared Hydrocarbon Gas Detector


IRmax is a premium quality IR gas detector designed for protecting facilities against flammable gas hazards. IRmax is the perfect choice for protecting new installations or for upgrading safety on existing sites.

Rugged & reliable

  Fast response: with a response time of only 4 seconds, IRmax provides rapid detection of hydrocarbon gas hazards.
  Ultimate dependability: designed and proven for compliance with IEC61508 SIL 2, IRmax has been rigorously tested in offshore environments.
  Wide operating temperature range: IRmax is fully temperature compensated for operation in environments from -40°C to +75°C.
  Dependable detection: IRmax continues to detect gas with the optical system 90% obscured by salt or other contaminants. The level of obscuration (contamination) can be checked easily via the IR Display, and a fault signal is generated when optics are 90% obscured.
  Proven track record: IRmax has been subjected to intense 3rd-party long-term tests for reliability in hot, cold, wet and saline environments.

Easy maintenance

  Low maintenance: IRmax employs sophisticated systems and algorithms to ensure reliable operation at all times.
  Remote non-intrusive calibration: the IR Display enables simple status checking, plus zeroing and calibration of the detector. The IR Display can be mounted up to 30 metres from the IRmax and test gas can be applied without needing to directly access the detector.
  Hand-held I.S. calibrator: where a local display is not required, IRmax detectors fitted with an I.S. barrier module can be checked and calibrated using an Intrinsically Safe (I.S.) calibration accessory.
  STAY-CLIR optics: optical components are treated with a patented coating to prevent potential obscuration in condensing atmospheres. The STAY-CLIR coating significantly reduces the buildup of dust, dirt or other contaminants on the window and mirror.


Simple to install

  Compact size: IRmax is much smaller than conventional IR gas detectors, and thus requires less space, effort and time to install.
  Installation options: IRmax can be wall mounted, fixed to a 2” (50mm) pipe or connected to an auxiliary junction box using a choice of mounting accessories.
  Versatile connectivity: with industry standard 4-20mA output signal plus options for RS-485 Modbus and HART communications, IRmax is compatible with virtually any control system.

Low cost of ownership

  Low power: unlike conventional IR gas detectors, IRmax does not require heated windows or mirrors. IRmax consumes only 1 Watt of power, enabling smaller power supplies and battery back-up systems to be used.
  Remote IR Display: the remote version of the IR Display enables checking, adjustment and calibration of the IRmax detector without requiring direct access. This feature removes the need to use ladders, scaffolding and ‘cherrypickers’ to perform routine maintenance tasks on detectors mounted in inaccessible areas.
  Minimal routine maintenance: features such as automatic optical obscuration monitoring and the requirement only for occasional gas testing keep maintenance engineer costs to a minimum.


Data Sheet

Ordering Information


IRmax Infrared Hydrocarbon Gas Detector

IRMAX-01 Methane, 0-100% LEL no display, M20, ATEX, 4-20mA sink
IRMAX-02 Methane, 0-100% LEL no display, M20, ATEX, 4-20mA source
IRMAX-03 Methane, 0-100% LEL fixed display, M20, ATEX, 4-20mA sink
IRMAX-04 Methane, 0-100% LEL fixed display, M20, ATEX, 4-20mA source
IRMAX-05 Methane, 0-100% LEL fixed display, 1/2"NPT, ATEX, 4-20mA+ HART source
IRMAX-06 Methane, 0-100% LEL IS barrier module, M20, ATEX, 4-20mA sink
IRMAX-07 Methane, 0-100% LEL IS barrier module, M20, ATEX, 4-20mA source
IRMAX-08 Butane 0-100% LEL no display, M20, ATEX, 4-20mA sink
IRMAX-09 Butane 0-100% LEL no display, M20, ATEX, 4-20mA source
IRMAX-10 Butane 0-100% LEL IS barrier module, M20, ATEX, 4-20mA sink
IRMAX-11 LPG 0-100% LEL no display, M20, ATEX, 4-20mA sink
IRMAX-12 LPG 0-100% LEL no display, M20, ATEX, 4-20mA source
IRMAX-13 LPG 0-100% LEL IS barrier module, M20, ATEX, 4-20mA sink

Note: The above list of short codes are the most commonly ordered configurations.

IRmax Remote and Hand-Held IR Display Options C011151/1 IR Display - Remote Version
C011152/1 IR Display - Remote Version With HART
C011205 IR Display - Hand-Held Version

IRmax I.S. Remote Display connecting leads

E07988 1.5 metre connecting lead.
E07990 5 metre connecting lead.
E07989 10 metre connecting lead.
E07991 15 metre connecting lead.
E07992 20 metre connecting lead.
E07993 25 metre connecting lead.
E07994 30 metre connecting lead.
M040400 Connector only (Bulgin, for customer made leads)

IRmax Accessories

C011204/2 Remote calibration box.
C011301 Remote calibration box.



Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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Keison International Ltd. trading as:
Keison Products, VoIPon Solutions & 4Gon
keison VoIPon Solutions 4Gon