Crowcon Gas-Pro IR Portable Gas Detector

Crowcon Gas-Pro IR Portable Gas Detector


The infrared measurement gives improved reliability and measures gas in two different wavelengths: one that absorbs gas and the other does not. With little chance of being poisoned, the Gas-Pro IR is inherently safer and saves the need of regular and expensive pellistor replacement when used in likely contaminated environments.

The Gas-Pro Range is known for its simple use and functionality as well as easy testing and calibration. The Gas-Pro IR now completes the Gas-Pro range and gives greater flexibility for sensor selection in this 5-gas multigas detector.

IR Technology

Infrared emitters within the sensor each generate beams of IR light . Each beam is of equal intensity and is deflected by a mirror within the sensor on to a photo-receiver, which measures the level of IR received. The “measuring” beam, with a frequency of around 3.3μm, is absorbed by hydrocarbon gas molecules, so the beam intensity is reduced . The “reference” beam (around 3.0μm) is not absorbed, so arrives at the receiver at full strength.

The %LEL of gas present is determined by the difference in intensity between the beams measured by the photo-receiver.

IR sensors are reliable in some environments that can cause pellistor-based sensors to function incorrectly or in some cases fail:

  • In some industrial environments, pellistors are at risk of being poisoned or inhibited. This leaves worker on their shift unprotected. IR sensors are not susceptible so significantly enhance safety in these conditions.
  • Exposure to high levels of flammable gas can cause “sooting” of pellistors, reducing their sensitivity and potentially leading to failure Pellistors require oxygen to function. However, IR sensors can be relied on in applications such as fuel storage tanks where there is little or no oxygen, due to flushing with inert gas prior to maintenance or which still contain high levels of fuel vapours.
  • The fail-safe nature of IR sensors, which automatically alert you to any fault, provides an additional layer of safety.

Gas-Pro IR measures in %LEL and has been certified for use in hazardous areas as defined by both ATEX/IECEx and UL.

User Friendly

  • Top mount display - makes it easy to read at a glance
  • Simple single button operation - can be used whilst wearing gloves
  • Intuitive functionality - reduces training time


  • Monitor 5 gases in many different combinations
  • Pumped and diffusion solutions - - offers multiple uses within one compact detector
  • Multiple languages
  • Automatic fail-safe flow plate recognition - takes away the pain of pre-entry testing
  • Specific and unique Pre-Entry Check (PEC) mode


  • Reliable lithium-ion battery - provides over 14 hr use from a 7.5 hr charge
  • Water and dust resistant to IP65 and IP67 - capable of withstanding harsh environments
  • Bump and calibration reminders - Full compliance

Gases and Ranges

GasRangeTypical AlarmsResolution
PID 0-1000ppm 50ppm 1ppm
Ammonia (NH3) 0-100ppm 25ppm 1ppm
Carbon dioxide (CO2) 0-5% vol. 0-5% vol. 0.01% vol.
Carbon monoxide (CO) 0-2000ppm 30ppm 1ppm
Carbon monoxide (CO) 0-500ppm 30ppm 1ppm
Carbon monoxide 
(hydrogen filtered)
 0-2000ppm 30ppm 1ppm
Chlorine (Cl2) 0 - 5ppm 0.5ppm 0.1ppm
Dual toxic (CO-H2S)H2S 0-100ppm
CO 0-500ppm
Flammable 0-100% LEL 20% LEL 1% LEL
Hydrogen sulphide (H2S)     0-100ppm 5ppm 1ppm
Nitrogen dioxide (NO2) 0-20ppm 1ppm 0.5ppm
Oxygen (O2) 0-25% vol. 19% / 23% vol. 0.1% vol.
Ozone (O3) 0-1ppm 0.1ppm 0.01ppm
Sulpher dioxide (SO2) 0-20ppm 1ppm 0.1ppm
Chlorine dioxide (ClO2) 0-1ppm 0.1ppm 0.1ppm
Nitric oxide (NO) 0-100ppm 25ppm 1ppm
5 Sensor
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  • Brand: Crowcon
  • Product Code: Gas-Pro IR
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Tags: portable, exproof, 5 gas

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