How can I calibrate my Aranet4?

aranet-techsupport

Posted: 02.07.2020 17:31

Modified: 23.04.2024 19:22

Aranet4 can be calibrated either automatically or manually at home.

In the case of automatic calibration mode, the Aranet4 device needs to be exposed to fresh air at around 420 ppm (for instance, outdoors or in a room with good air exchange) for approximately 8 hours during each 30 day operation period.

When doing a manual calibration the Aranet4 device must be exposed to fresh air (about 420 ppm of CO2) and the environment should be stable (not changing) for 30 minutes while the calibration is done. Maintain a distance of at least 1 meter from the device during the calibration process so the CO2 from your breath wouldn’t impede the calibration. To initiate the manual CO2 calibration change the switch position at the back of the device behind the batteries from MANUAL to AUTO and back to MANUAL (maintain a maximum of 1 second between each movement):

Please note! The batteries must be inserted into the device. To trigger the switch, use SIM-tool delivered with Aranet4 or another similar tool.

The calibration progress will be displayed on the screen of the device. In case of a calibration failure message, make sure that the environmental requirements are met and repeat the process from the beginning.

Manual calibration can be done using the Aranet4 app as well. You can see the instructions on how to do the manual calibration via the app in the Aranet4 Calibration Tutorial.

For reference background CO2 level please check the global outdoor CO2 level map: https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=29.16,51.27,791/loc=24.215,57.021
Click with the mouse pointer to your location on the map, and you will see current CO2 level outdoors.
groutchmeuh

Posted: 18.05.2022 11:29

For automatic calibration: do you need to spend the eight hours out in the fresh air in a row or can it be from time to time?

Thanks
aranet-techsupport

Posted: 18.05.2022 11:50

It can be done from time to time during 30-days period. But we advise manual calibration - it is much faster (about 30 minutes) and more reliable.
rn

Posted: 29.09.2022 23:43

Hi, folks. How do we go about accessing the calibration in the app? The youtube video posted above shows a calibration button (and a lower menu) in the app that do not seem to actually appear in the app.
rn

Posted: 30.09.2022 00:31

Ok...figured it out.

(1) The app that I was using was the "Aranet4 Display" app, not the Aranet4 app.

(2) The reason that this app was installed is that it was the only one that came up in a search on Google Play. Evidently I have Android v7, and even though the manual claims that versions 6+ are compatible, the current version of the app is not compatible with this Android version.
enness

Posted: 14.11.2023 06:08

I've had my Aranet4 for a year now (and LOVE it!). I live on the Canadian Prairies (i.e., it's getting cold) but it's time to calibrate it. The forecast high for the next two days is +7 Celsius. I read that the operating temperature of the Aranet4 sensor is 0-50 Celsius. Is it OK to calibrate it at +7 Celsius (or do I risk damaging the sensor by calibrating it at such a cool temperature)?
aranet-techsupport

Posted: 14.11.2023 08:11

Yes, as long as its within operating temperatures it should be ok, as the calibration is only for calibrating the co2 sensor.
enness

Posted: 15.11.2023 05:06

Thank you for the quick reply. I manually calibrated it today while the temperature (in the shade) was 10 C.
pjoneja

Posted: 29.01.2024 03:33

Hi. I got an Aranet4 as a gift and have been using it for a few weeks now. Initially, the readings were very high. The lowest was around 800 indoors, even with no one in the room for hours and the fresh air intake pulling fresh air into the house. I put it outside, and it was still almost 700 outside. So, I did a manual calibration. All seemed well after the manual calibration. Reading outside was close to 420, and readings inside were 500-600 on average for a couple days. Then I noticed it trending downward to where at some points it would read 360 inside. I tried calibration again, and again after a few days, the readings tended to drift downward.

I have a couple questions. First, why does it seem to drift downward over a a few days? Second, when I check earth.nullschool.net, it says that much of the area I live in (and honestly, good portions of the US) have outdoor CO2 levels higher than 420. Our region seems to be trending around 440, give or take, over the past few days. How does one recalibrate the sensor when outdoor air has slightly higher readings? It feels like my only option is to drive a few hours to the wilderness, which is not something that is easy to do in my current situation.

Thank you.
pjoneja

Posted: 29.01.2024 03:33

Hi. I got an Aranet4 as a gift and have been using it for a few weeks now. Initially, the readings were very high. The lowest was around 800 indoors, even with no one in the room for hours and the fresh air intake pulling fresh air into the house. I put it outside, and it was still almost 700 outside. So, I did a manual calibration. All seemed well after the manual calibration. Reading outside was close to 420, and readings inside were 500-600 on average for a couple days. Then I noticed it trending downward to where at some points it would read 360 inside. I tried calibration again, and again after a few days, the readings tended to drift downward.

I have a couple questions. First, why does it seem to drift downward over a a few days? Second, when I check earth.nullschool.net, it says that much of the area I live in (and honestly, good portions of the US) have outdoor CO2 levels higher than 420. Our region seems to be trending around 440, give or take, over the past few days. How does one recalibrate the sensor when outdoor air has slightly higher readings? It feels like my only option is to drive a few hours to the wilderness, which is not something that is easy to do in my current situation.

Thank you.
aranet-techsupport

Posted: 29.01.2024 08:39

Hi!
To answer your question about drift. It might be that when you calibrated the outdoor level was locally higher than the 420 ppm it calibrates And after a few days it dropped so did the reading.
If the outdoors has only higher readings like 440ppm, then I would not worry so much, this just adds a bit of an error on top of the device's +/-30ppm accuracy. If you need the best precision, then going to a place with guaranteed 420ppm air would be the best option.

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