NDIR Sensors

Alphasense CO2 and Methane infrared sensors

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With over 25 years’ experience in the design and manufacture of gas and particulate sensors, we have established a reputation as a reliable source for a wide range of gas sensor technologies.

At Alphasense, we supply high-quality Oxygen, CO2, toxic and flammable gas sensors to many of the world’s leading industrial OEMs.

If you manufacture portable or fixed industrial gas detection monitors, stack gas analysers or environmental monitoring instruments, we have the solution for your needs.

Alphasense CO2 and Methane infrared sensors are supplied in the industry standard miniature (20mm diameter) gas sensor housing.

Alphasense CO2 and Methane infrared sensors are supplied in the industry standard miniature (20mm diameter) gas sensor housing.
Patented optics give the best signal to noise ratio of any 20mm diameter NDIR and universal linearisation constants allow easy implementation.
The on-board temperature sensor allows for software compensation, including ideal gas law correction.


Choose between the IRC-A1 with dual channel pyroelectric detector or the IRC-AT with dual channel thermopile detector. These CO2 sensors are designed for IAQ, safety, combustion and high CO2 process control applications.

Application notes explain linearisation, temperature compensation and circuitry. Both the IRC-A1 and IRC-AT cover the entire concentration range of measurement, simply implement the appropriate linearisation constants in software for your required range:

  • IAQ 0 to 5,000ppm CO2
  • Safety 0 to 5% CO2
  • Combustion 0 to 20% CO2
  • Process control 0 to 100% CO2

Methane/ Hydrocarbons

The IRM-AT uses a dual thermopile detector for measuring Methane and other Hydrocarbons in non-explosive environments. The plastic housing limits use to non-Ex environments up to 2.5% Methane.

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Our team can help you with any product information, quotes, or any general questions you may have about the product.

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