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How does an NDIR CO2 Sensor Work?

Sensors in an HVAC environment

NDIR is an industry term for "nondispersive infrared", and is the most common type of sensor used to measure carbon dioxide or CO2 in HVAC applications.

A non-dispersive infrared (NDIR) sensor has a detector that measures how much infrared light of a specific wavelength is absorbed by the surrounding air. This measurement is then used to calculate the CO2 concentration. Major advantages of NDIR sensors are the low life-cycle cost and a precise and stable long-term operation.

Sentera CO2 sensors use the ABC Logic self-calibration algorithm. Thanks to this algorithm, the drift in the NDIR sensors is automatically corrected in normal indoor applications. This eliminates the need to manually recalibrate the sensors. This results in a maintenance-free sensor with an with an exceptionally long life expectancy.


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