Honeywell Launch Maintenance-free Commercial CO2 Sensors

The new CRIR sensor series is designed to provide enhanced, long-term stability for normal indoor applications. Offering easy integration and a small size, the sensors provide consistently and repeatability in Carbon Dioxide detection.

The sensors are single channel, non-dispersive infrared (NDIR) and within them is a sensing chamber with an infrared source at one end and a detector fitted with an optical filter at the other end. The source emits radiation at wavelengths which include the absorption band of CO2.

The filter blocks wavelengths which are not sensitive to the presence of CO2, thereby increasing selectivity and sensitivity. As the light passes through the sensing chamber, a fraction is absorbed if CO2 is present. The difference between the light emitted by the source and received by the detector can then be converted to a CO2 concentration reading.

The Automatic Baseline Correction (ABC) function can automatically calibrate the sensor’s lowest reading over a pre-configured interval to 400 ppm CO2. This enhances long-term stability and may eliminate the need for calibration.

Available in two versions, the CRIR E1 offers up to 5000ppm extended range while the CRIR M1 offers up to 10000ppm. Further benefits of both include temperature compensation and UART digital interface.

The sensors are suitable for many potential applications including HVAC, demand controlled ventilation; indoor air quality (IAQ) measurement; air purification systems and Smart/IoT (Internet of Things) systems.

For further information or to discuss your requirements, contact our sensors team on Tel: 01793 899417 or email:

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