Calibration of Aranet CO₂ and Temperature Sensor
The sensor comes factory calibrated, but when recalibration is needed, it can be done in the following steps:
Screw out the top part of the sensor.
The small dipswitch on the PCB board should be set in the MAN position
Press and hold CALIBR. button till the red LED starts to blink;
Now, sensor should be left in the fresh air outdoor environment during the calibration process for 30 minutes without any person nearby.
When the calibration process is finished, screw the sensor's top part back. A brief video of the process can be found here.
The general recommendation is to redo the calibration for Aranet CO₂ sensors once per year, as sensor measurement values will start to drift over time.
Out-of-the-box brand new sensors have the factory calibration, and for some time, there is no need to do it and measurements will be precise just by putting the batteries and pairing sensors to the Aranet Pro base station.
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