The manual calibration does not work

stefan.brandmeier
I triggered the manual calibration, with the device outside for more than 8 hours as described. Now the CO2 reading is twice the actual value. I have three different references and fresh outside air to base this assessment on. So with this not working, how long do I have to provide the device with fresh air to allow tha automatic calibration to work properly ?
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  • Comment author
    drtetrault

    I have one Main module and two room modules.  I have put them altogether on a table where there is lots of circulating air.  I have done the CO2 manual calibration.  All the readings are different, with one at least 100 above another.  Why aren't they the same?

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  • Comment author
    slugrubug

    I have a similar problem. The indoor module had a CO² reading around 200 ppm. I placed it next to the main module which was reading 420 ppm. After airing out for an hour and seeing no change on the indoor module I pressed on manual calibration and was warned not to turn off the (battery) power for 8 hours. Then it lost connection to the main module, even though it is sitting right next to it.

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  • Comment author
    wkohler88

    I have a slightly different problem.  When I initiate a manual CO2 recalibration of my additional module, I briefly see a spinner as expected.  But then almost immediately a small window pops up saying "Calibration started  Don't unplug the product for 8 hours".  At that point, I can no longer see the spinner to verify that calibration is active.  If I cancel the pop-up window, I don't see a spinner, so how do I know if the module is calibrating?

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  • Comment author
    slugrubug

    For anyone experiencing problems with calibration and/or two modules showing different measurements, you mihht be interested in the reply I got from Netatmo support. Note their incredibly high error tolerance:

    On a new device, the CO2 sensor can take up to 8 days to calibrate (due to transport, storage conditions, etc.).
    An optimal average PPM measurement varies between 350 and 450.

    Please also note that our CO2 sensors have a standard accuracy of +/- 100ppm. It is therefore quite normal to see two modules measuring 900 ppm and 1100 ppm side by side (for an actual measurement of 1000 ppm CO2).

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