What is the NDIR sensor and why is it preferred over other types of sensors?
Aranet4 uses non-dispersive infrared (NDIR) sensor for measuring the CO2 level. The device has a small gas chamber with infrared light source in which CO2 absorbs the light. An optical filter in front of a detector then filters all of the light except the wavelength that the CO2 molecules can absorb so a precise measurement of the CO2 level can be made.
This type of CO2 reading provides a higher precision than regular electrochemical sensors because carbon dioxide is uniquely detectable with no interference from other gasses. Besides that the lifespan of the NDIR sensor is much longer because there is no deterioration or “burnout” of the sensor itself, and less recalibration is needed.
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