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Crowcon IRmax ultra-compact (IR) gas detector



IRmax is an ultra-compact infrared (IR) gas detector that delivers rapid, fail-safe detection of hydrocarbon gases and vapours. The IRmax gas detection system offers the choice of a detector only, a local gas/status display, a remote gas/status display or non-intrusive calibration via an I.S. calibration tool or hand-held HART communicator.


The reliability of IRmax has been proven in hot, cold, wet and saline environments, making it ideal for offshore.
IRmax’s unique STAY-CLIR optical components are treated with a highly durable coating that completely prevents faults due to condensation. As IRmax contains no components for artificially heating optical surfaces, power consumption is dramatically reduced, requiring only 1W of power.

IRmax feature

Simple to install

  • Compact size – requires less space, effort and time to install
  • Various installation options – can be wall mounted, fitted to a 50mm (2 inch) pipe or connected to an auxiliary junction box using a choice of mounting accessories
    Industry standard 4-20mA output – compatible with virtually any control system
  • Options for HART communications and RS-485 Modbus

Easy maintenance

  • Remote non-intrusive calibration – the IR display can be mounted up to 30 metres from the IRmax and test gas can be applied without requiring direct access to the detector
  • Hand-held Intrinsically Safe (I.S) calibrator – IRmax detectors fitted with an I.S barrier module can be checked and calibrated using an I.S calibration accessory
  • STAY-CLIR optics – prevents condensation on optical components

Low cost of ownership

  • Low power – only consumes 1W of power, enabling small power supplies and battery back-up systems to be used
  • Automatic optical obscuration monitoring – minimal routine maintenance keeps costs down
  • Annual proof-test interval


IRmax Specifications

 IRmaxIRmax with Fixed IR displayIRmax with IS Barrier ModuleRemote IR Display
Size158 x 75 x 57mm (6.2 x 2.9 x 2.3ins)230 x 75 x 57mm (9 x 2.9 x 2.3ins)261 x 75 x 57mm (2.3 x 2.9 x 2.3ins)60 x 54 x 48mm (2.3 x 2.1 x 1.9ins)
Weight1.58kg (3.5lbs)2kg (4.4lbs)2.4kg (5.3lbs)0.2kg (0.4lbs)
Ingress protectionIP66
Enclosure material316 stainless steel
Power12-30 Vdc. < 1W
ConnectionOne M20 or 1/2” NPT cable gland entry
Electrical output4-20mA current sink or source
2mA dirty optics warning (at 75% obscuration, configurable)
0mA detector fault signal (at 90% obscuration, configurable)
RS-485 Modbus (optional), HART 7 (optional)
Operating temperature-40°C to +75°C (-40°F to 167°F)
Humidity0 to 100% RH non-condensing
Pressure rangeAtmospheric +/- 10%
Repeatability+/- 2% FSD
Zero drift+/- 2% FSD per year maximum
Response timeT-90 <4 seconds
PerformanceComplies with EN60079-29-1
Functional safetyValidation to IEC61508:2010, EN50402:2005 SIL 2
ApprovalsEx II 2 GD
Exd IIC T6 Gb (Tamb -40to+50°C),
T4 (Tamb -40to+75°C)
Ex tb IIIC T135°C Db (Tamb -40 to +75°C)
Ex II 2 G
Exd ia IIC T4 Gb (Tamb -40to+75°C)
Ex II 2 GD
Exd ia IIC T4 Gb (Tamb -40to+75°C)
Ex tb IIIC T135°C Db (Tamb -40 to +40°C)
EMC complianceEN50270:2006, FCC CFR47 Part 15B, ICES-003
ZonesCertified for use in Zone 1 & 2, and Zone 21 & 2 hazardous areas




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