4 ms·
My understanding is that some co2 sensors assume the minimum value seen over the last 30 days is 400ppm as a calibration. This could possibly explain a negative
by unlikelymordant 4y ago
My understanding is that some co2 sensors assume the minimum value seen over the last 30 days is 400ppm as a calibration. This could possibly explain a negative value if the sensor has been in higher co2 environment for some time, and is suddenly exposed to the outside.
- Buttons840 4y agoYou're right. The instructions say to place the sensor outside for a time to calibrate it, which I never did.