Compensating for ambient temperature fluctuations
When an NDIR gas sensor is exposed to ambient temperature fluctuations, it should be ensured that the sensor itself has a stable temperature within the specified range. This often occurs in situations where temperature fluctuations in winter compared to summer or even day/night changes have a large impact on the sensor. Also portable devices which are stored or transported in a cold environment should be heated up with a gas flow before measurement.
Risk of condensation inside the sensor
To minimize this risk, it is advisable to ensure that the temperature of the gas path and sensor is higher than the temperature of the gas flow. If the sensor is used in an emission control system for a combustion process, it is especially important to avoid moisture condensation, as this can damage the sensor.
Increase sensor accuracy
Even though NDIR sensors are temperature compensated, the measurements remain temperature dependent. Therefore, it is recommended to keep the temperature of the sensor as stable as possible, especially if the requirements for the accuracy of the measurement are very high.