What would be the first thing to do if Aranet4 device shows CO2 levels well above 500 ppm in fresh air outdoor environment?
Please try recalibrating the device as shown in the video: https://www.youtube.com/watch?v=CD8E6WzpvjM except put the sensor in a full outdoor environment during the calibration process for 15 minutes without any person in close proximity.
Is it ok to attempt a calibration outdoors when the temperature is in the 0 C to 10 C range?
I see in the User manual that it says operation < 10 C may result in a shift of sensor reading with slow recovery time.
As the Aranet4 device has reduced measurement accuracy in the temperature range 0...+10 °C, then it is recommended to calibrate it in the temperature range +15 … +35 °C.
Ok that is very good to know becuase for 7 months of the year our outdoor temperatures are < 15 C so calibrating outdoors will not be possible. We will look for a temperature-controlled indoor facility with a large fresh air draw and no humans about.
If possible then the most accurate calibration will be performed if the Aranet4 device can be placed in a closed environment filled with 420 ppm CO2 concentration level reference gas during the calibration process.
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