Calibrate to other than 420ppm?
anastrophe
Posted: 22.04.2023 02:50
Modified: 25.04.2024 19:24
As we know, CO2 levels are highly variable by location. I live in a moderately populated suburb. I calibrated my two Aranets here. I sent one to my brother, who lives in a well forested mountain area about 100 miles away. When he turned it on it register as low as 360ppm.
How can one truly calibrate to local levels?
I realize that for normal purposes, a hundred ppm difference is immaterial - I'm just curious!
aranet-techsupport
Posted: 24.04.2023 10:12
Modified: 24.04.2023 10:13
Hello anastrophe!
After change of location where CO2 levels are highly different, manual calibration should be performed again. Here you can find instructions on how to do it.
If any other assistance is required, please contact us via support@aranet.com
Aranet Tech Support
anastrophe
Posted: 25.04.2023 23:07
Thank you. I understand how to do that. The problem is that - unless I'm missing something - there is no way to calibrate to the local levels. If the true local level somewhere is 360, then calibrating to a strict 420 overestimates the level. If the true local level somewhere is 600ppm (such as an inner-city area) then after calibration it will be giving an under-representation.
Again - I know these are small differences in the greater scheme of things. It would be cool if one could use a public resource to find what current levels are near where one is, and calibrate to that.
cheers!
aranet-techsupport
Posted: 26.04.2023 09:43
Hello anastrophe,
Thank you for feedback.
Yes, it is true that calibration should be done in environments where value of CO2 is close to 420 ppm for it to be accurate.
Unfortunately, we cannot provide resource for every local area CO2 level as those differ and are affected by multiple factors locally.
Here you can check the global map of CO2 emissions by location, but that will not be completely accurate due to local changes in CO2 levels: https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=29.16,51.27,791/loc=24.215,57.021
Sorry for any inconvenience.
Aranet Tech Support
rhadorn
Posted: 13.12.2023 08:58
Should it not be possible to enter in the app the value to which to calibrate? I cannot fly to Mauna Loa to calibrate...
aranet-techsupport
Posted: 13.12.2023 09:40
Hi!
That is not currently available but we are evaluating the possibility of this type of feature.
And you do not need to fly anywhere to calibrate, just need to be around 420ppm for Co2 calibration. If the environment is slightly off the 420ppm, then all measurments will be just slightly off too. For normal usage that should not be a big problem.
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