Clairair’s infrared gas sensors incorporate patented technology to produce an optical gas sensor within an industry standard format. Standard non dispersive infrared gas sensors are complemented by a state of the art OEM 4-20mA transmitter that controls the sensor, provides a robust linear 4-20mA output and incorporates an extensive serial communications facility. Infrared sensors with support electronics are easily configurable to a wide range of applications. Patented sensors currently cover %lel hydrocarbons, %volume methane, %volume hydrocarbons, ppm carbon dioxide, low %volume carbon dioxide and high %volume carbon dioxide. The %lel hydrocarbons respond to a wide range of alkanes, alkenes, aromatics, alcohols, ketones, esters and more exotic hydrocarbons.

We provide technical support on catalytic gas sensors (alternatively known as “Pellistors” from the original description as a “Pelletised resistor”) which are well known combustible gas sensors that monitor the presence of explosive levels of most combustible gases, including those that are not detectable by normal infrared means. Hydrogen is a classic example of an explosive gas that is not infrared active.

Specialist sensors include customer specific sensors and sensors that address different sensing applications using alternative sensor technologies.


As a truly independent sensor developer and manufacturer we offer impartial advice, help and support on a wide range of sensor issues, ranging from applications support to any type of sensor support.

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If you have any questions or bespoke requirements, get in touch with us today to find out how we can help you!


We make extensive use of 3D CAD, multilayer PCB and software compilers in developing products.

About Us

With over 30 years combined experience in sensors, spanning many sensing techniques, our mission statement is: “To provide independent, professional and innovative solutions to sensor applications.”