MortarThePoint Posted May 28, 2021 Share Posted May 28, 2021 I am interested in getting an air quality monitor, to include a CO2 meter. Can anyone recommend one? It would be good if it could measure: CO2 Particulates (e.g. PM2.5) Temperature Humidity Even better if it could log these, failing that Max/Min would be good as well. I have found various on Amazon, but they aren't particularly popular. This one was so cheap I have bought it to take a look, but am very dubious given the low cost: https://www.amazon.co.uk/dp/B085DJQRY1/ I'd be keen to get one I would trust a bit more though. Link to comment Share on other sites More sharing options...
Cpd Posted May 28, 2021 Share Posted May 28, 2021 This has been talked about before and without making something bespoke there seems to be little available on the market that represents quality / accuracy at an affordable price. Link to comment Share on other sites More sharing options...
MortarThePoint Posted May 28, 2021 Author Share Posted May 28, 2021 13 minutes ago, Cpd said: This has been talked about before and without making something bespoke there seems to be little available on the market that represents quality / accuracy at an affordable price. Thanks, I've started looking at various sensor modules so may end up with a bespoke system Link to comment Share on other sites More sharing options...
PeterW Posted May 28, 2021 Share Posted May 28, 2021 What is your budget ..? For something that does that kit you’re probably £4-600 off the shelf. Link to comment Share on other sites More sharing options...
MortarThePoint Posted May 28, 2021 Author Share Posted May 28, 2021 Just now, PeterW said: What is your budget ..? For something that does that kit you’re probably £4-600 off the shelf. My budget is probably up to around £175. I don't need professional grade calibrated stuff, but I don't want junk (despite having just bought a £17 one ? ) Looks like I may have to make my own system which is a time sink but interesting. I'd buy something now rather than waiting to make something in a couple of years time. Link to comment Share on other sites More sharing options...
Conor Posted May 28, 2021 Share Posted May 28, 2021 Just an FYI, any air quality sensors I've worked (esp oxygen and organics) with in the past have been unreliable and require recalibrating or replacement annually. Link to comment Share on other sites More sharing options...
PeterW Posted May 28, 2021 Share Posted May 28, 2021 Is there a purpose to what you want to do with it ..? Internal or external AQ..? You’re not having MVHR are you ..? Link to comment Share on other sites More sharing options...
MortarThePoint Posted May 28, 2021 Author Share Posted May 28, 2021 9 minutes ago, Conor said: Just an FYI, any air quality sensors I've worked (esp oxygen and organics) with in the past have been unreliable and require recalibrating or replacement annually. Yes, that is a concern. I know there has been a lot of progress in gas sensors over the past 20 years and hoped that some would have filtered down to consumer grade products. I do see some interesting IR based CO2 sensor modules for around £20 and PM2.5 ones for around £30. That's probably what I would incorporate into a homebrew one. 5 minutes ago, PeterW said: Is there a purpose to what you want to do with it ..? Internal or external AQ..? You’re not having MVHR are you ..? Yes internal AQ. We're not having MVHR but I am looking at PIV and/or dMEV and so there is scope to close the loop on air quality which MVHR would also allow. MVHR is obviously a more energy efficient approach, but we're exploring all of that on another thread. Link to comment Share on other sites More sharing options...
PeterW Posted May 28, 2021 Share Posted May 28, 2021 So you will need trickle vents then - AQ is uncontrollable at that point. Link to comment Share on other sites More sharing options...
Adrian Walker Posted May 29, 2021 Share Posted May 29, 2021 (edited) I'm building a true CO2 meter based on the Sensirion SCD41 sensor with a Raspberry Pi. It might also include the SGP40 VOC sensor. Edited May 29, 2021 by Adrian Walker Multiple entry Link to comment Share on other sites More sharing options...
MortarThePoint Posted May 29, 2021 Author Share Posted May 29, 2021 5 minutes ago, Adrian Walker said: I'm building a true CO2 meter based on the Sensirion SCD41 sensor with a Raspberry Pi. It might also include the SGP40 VOC sensor. Nice. I've used their flow sensors before and know the company to be reputable which is important Link to comment Share on other sites More sharing options...
Adrian Walker Posted May 29, 2021 Share Posted May 29, 2021 19 hours ago, MortarThePoint said: Yes, that is a concern. I know there has been a lot of progress in gas sensors over the past 20 years and hoped that some would have filtered down to consumer grade products. I do see some interesting IR based CO2 sensor modules for around £20 and PM2.5 ones for around £30. That's probably what I would incorporate into a homebrew one. Yes internal AQ. We're not having MVHR but I am looking at PIV and/or dMEV and so there is scope to close the loop on air quality which MVHR would also allow. MVHR is obviously a more energy efficient approach, but we're exploring all of that on another thread. Have a look at the Sensirion SCD41 sensor - https://www.sensirion.com/en/environmental-sensors/carbon-dioxide-sensors/carbon-dioxide-sensor-scd4x/ Link to comment Share on other sites More sharing options...
MortarThePoint Posted May 29, 2021 Author Share Posted May 29, 2021 8 minutes ago, Adrian Walker said: I'm building a true CO2 meter based on the Sensirion SCD41 sensor with a Raspberry Pi. It might also include the SGP40 VOC sensor. Nice. I've used their flow sensors before and know the company to be reputable which is important 1 Link to comment Share on other sites More sharing options...
Adrian Walker Posted May 29, 2021 Share Posted May 29, 2021 (edited) 4 minutes ago, MortarThePoint said: Nice. I've used their flow sensors before and know the company to be reputable which is important It's nice and small and uses photoacoustic sensing principle, that's the development board sitting on my Apple keyboard Edited May 29, 2021 by Adrian Walker Link to comment Share on other sites More sharing options...
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