NDIR CO2 Sensor

A non-dispersive infrared (NDIR) carbo dioxide (CO2) sensor is commonly used to measure atmospheric CO2 and partial pressure CO2 (pCO2) of seawater. The sensor is spectroscopic. CO2 molecules absorb infrared light. An infrared light is passed through a tube that the gas to be measured. The amount of infrared light absorbed is then measured. Therefore, the absorbance can be used to calculate the concentration of CO2.

There are many types of NDIR sensors for CO2. Ranging from portable hand held units to desktop units to circuit board sensors for the builder. The prescision of most commercial NDIR CO2 sensors is 30-200 ppm. Some if specifically calibrated can be decreased to 15 ppm.

Drawbacks
Water also absorbs infrared light. THerefore, the sensor needs to be corected for the humidity. Some sensors resolve this problem internerally, while others leave it to the user. IF it is left to the user the humidity will be measured and used in calculations or the humidity is removed from the air.

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