Cirius Infrared Gas Sensors

Our Cirius range of standard infrared gas sensors incorporate patented technology and provide raw detector signals for users to interface to their own IR circuitry and software. Using a novel optical technique our sensors offer high sensitivity to target gases whilst having an extremely small sensing volume. Housed in an industry standard 20mm diameter package they are available as “basic format” 7 pin sensors.

  • All metal construction
    • No plastic parts to deform over temperature
    • Self screening for enhanced RFI tolerance
    • Self heatsinking for temperature stability
  • Small internal volume
    • Minimised free internal volume
  • High performance internal detectors
    • High ppm CO2 resolution
    • High volume CO2
    • %lel and %volume methane and hydrocarbon range options
  • Standard housing size
    • 20mm diameter 16mm depth
  • Basic format
    • Active, reference and thermistor temperature outputs


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.

Contact Us

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.”