CO2 reading rises and falls in response to temperature
bb
Posted: 13.03.2023 20:02
Modified: 07.10.2024 09:45
I recently bought an ARANET4 Home, and have noticed that the CO2 reading on the unit rises when our heating comes on, and falls when our heating goes off. For instance, a 0.8 deg C increase in the room temperature corresponds with a gradual rise in CO2 reading from 680ppm to 980ppm. No windows were opened or closed during this time, nor people moving between the rooms. The only variable that has changed is the radiator getting warmer in the room due to the (distant) boiler coming on. What could explain this?
aranet-techsupport
Posted: 14.03.2023 09:48
Hello bb,
Thank you for choosing Aranet4 product. Most likely it is related to material used to heat up the boiler- it could be natural gas or burning wood? Or is it heated up by electricity? Perhaps your neighbours might be using gas heating as well. If the boiler(and place to heat it up) is located in same building, it might affect the CO2 for whole building as well. If you need more assistance or any questions arise, please contact support@aranet.com
Regards,
Aranet Techsupport
bb
Posted: 14.03.2023 10:35
Hello. Thank you for you reply.
No, our oil boiler is very distant to the room in question and behind a few closed doors. It is a detached house so no neighbours. What else could be the reason? Gas composition properties relating to temperature? Our radiators affecting CO2 somehow?
aranet-techsupport
Posted: 14.03.2023 10:49
Hello,
How is the boiler powered up? Can you please describe, what does the room were the measurements were taken has? Are there any animals/plants in it? How was the temperature decreased in the room? How much time did it take for the Aranet4 to register from measurement of 680ppm to 980ppm?
nobody
Posted: 29.01.2024 01:53
I also noticed the same thing with temp/CO2 coorelation. I left the device upstairs during the day and nobody was upstairs. The temp warmed up during the day and then fell after 4pm. We didnt have heaters on but the room was only warmed from the sun shining thru windows. As the temp increased, the CO2 measurement also increased. Strange since there wasnt anyone breathing upstairs, and also no windows cracked open after 4pm to introduce fresh air upstairs
aranet-techsupport
Posted: 29.01.2024 08:32
Hi!
Can you give more details about the room the Aranet was in, like if there were any plants or pets in the room. Was the door closed, etc.nobody
Posted: 30.01.2024 00:27
Upstairs master bedroom. No pets. Door closed. There is one fiddle leaf fig plant. No windows opened but curtins were open. No heaters were on during the day. Any thoughts?
guest
Posted: 30.01.2024 09:44
What was the rise in T and Co2 respectively?
There might be several explanations for this:
1st if the house is small enough and enough people are breathing with no circulation, it might just be that the rise upstairs was simply because of that.
2nd if there are gas appliances or heating systems in the house, this can cause an increase in CO2, even in upstairs rooms.
3rd the rise of temperature would lead to more air circulation in the room, which could bring in more Co2 from other rooms or the ground.
4th even with the windows closed, there might be some leakage and outdoor air could leak in, if the house is close enough to polluting sources like traffic or factories, the co2 could come from there.drjasonharrison
Posted: 07.03.2024 03:08
You may want to repeat your observations with a room fan to eliminate any "stacking" of room temperature gradients and gas concentrations.
paht
Posted: 10.03.2024 14:58
I received my aranet4 3 Feb and fresh air in the bedroom window sill was reading 458ish at 20C
I took it to Iceland and got similar readings
After touring finland and Norway back in Canberra fresh air on the windowsill is 700ish at 30.1C on 9 march
Should I re calibrate? Is this normal?
aranet-techsupport
Posted: 11.03.2024 08:25
Hi!
Yes, if the high readings persist for a while, like a week, then you can be sure to do a manual calibration.paht
Posted: 12.03.2024 13:49
Thank you, I will try recalibrating. What could cause it to go out of adjustment? The offset is ~~150. Could correct higher readings simply by subtracting the offset? Is it linear?
aranet-techsupport
Posted: 12.03.2024 14:44
Probably the device became out of calibration because of all of the different height differences and travelling etc.
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