How to calibrate if device is outdoors but CO2 is above 420ppm?

• 

  irishmeow

  Posted: 20.08.2021 06:12

  Modified: 21.11.2024 07:39

  I've been meaning to calibrate my Aranet4 but the problem is when I place the device in an outdoor environment, the lowest CO2 reading I'm able to get is in the 443-480. So far, I haven't even been able to get it back down in the 440s. My question is, would it be okay/safe to trigger the calibration as long as its in an outdoors environment,  even if the reading isn't in the 400-420ppm range? 
• 

  aranet-techsupport

  Posted: 20.08.2021 09:01

  Hi,

  It can happen that outdoor CO2 level is above 420 ppm. You can check it with third party services like https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=-354.32,51.43,1792/loc=-6.785,53.865

  So, you can launch Aranet4 CO2 calibration and then compare the measurement data.
• 

  irishmeow

  Posted: 22.08.2021 06:25

  Thanks for this. What do I do though if the CO2 levels based on the data is suppoed to be around 420ppm but I still can't manage to get a reading close to that? Still logging closer to 500ppm than 400. Do I still trigger calibration in this case? 
• 

  aranet-techsupport

  Posted: 23.08.2021 11:32

  Hi,

  Please try manual calibration in the open-air one more time and compare Aranet4 open-air measurement with https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=-354.32,51.43,1792/loc=-6.785,53.865 

  Don't forget to choose your location on the map above. If the difference still remains too high, please contact support@aranet.com.
• 

  irishmeow

  Posted: 25.08.2021 09:14

  Hi, 
  
  Happy to report that after manual calibration, it seems to have fixed the issue. I checked the CO2 levels in my location previously and they did reflect 419ppm. Prior to the calibration, lowest number I got outdoors was in the 470s, but now was able to get a reading of about 408. Anyway, just wanted to say thanks for the help! 
• 

  rhadorn

  Posted: 13.12.2023 10:31

  It is quite normal that you get readings around 420 ppm after successful calibration, since the calibration process supposes you calibrate in 420 ppm air.... even if the real value is actually higher! The reading you get after calibration is an illusion.

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