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July 12, 2017 at 2:08 pm #4605
ON1GL
Participant

thanks for replying SaltoUYStation
there was no power loss, the unit is on a ups.
It happens about 24 hours after powerup, just read this pdf file
http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf it could be autocallibration that kicked in (see page 9) ? but what are the correct values ?