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Nordic Thingy:52 Gas sensor readings

Hemant

Hello, We have observed fluctuation in Gas sensor readings from Nordic Thingy:52. eCo2 and VOC readings are not at all near the calibrated sensor readings. Tried Nordic Thingy Android app and the Raspberry Pi NodeJs application. For Co2 sensor we have used co2 mini sensor from co2meter.com it was showing 800 ppm and Nordic Thingy:52 was showing 400 ppm. www.co2meter.com/.../co2mini-co2-indoor-air-quality-monitor

For VOC we have used Sainsmart TGS2600 sensor which was showing VOC as 10ppb and Nordic Thingy was showing VOC as 25 ppb. Can someone explain the reason for this difference in sensor readings?

Regards, Hemant

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    Hi Hemant! I just setup a Thingy right now in the office and I am getting a reading of 400 ppm. This makes sense because worldwide CO2 readings have reached 400 ppm (see link) (I am making a naive assumption that the measurements in Hawaii are similar to the measurements here in Trondheim). I also tried to just breathe on the Thingy (because humans breathe out CO2) and the readings skyrocketed from 400 to 2500 ppm. So you could try that out and see if the CO2 Thingy measurements change at all. Looking at your co2 sensor readings from the co2meter.com, I would assume the co2mini sensor would be more accurate. Where are you taking your measurements? Does it make sense that the mini co2 measurement device would get 800 ppm? If you are indoors in a room, it could make sense to have 800 ppm (see link). I will check it out a bit more and give you an update. I will find out a bit more about voc and post a comment soon! Hope that helps!

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    Found out a bit more. The Nordic Thingy:52 uses a CCS811 sensor for measuring CO2 and VOC. The CO2 measurements are from 400-8192 ppm (see PDF). Any values below 400 will be clipped to show 400 ppm (to the best of my knowledge, at least).

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    I got a tip from an employee that the Thingy CO2 and VOC sensors require a few hours to output the "correct" CO2 and VOC readings. So I think the best thing for you is to leave the Thingy on overnight and then check the readings the next morning. Then, the CO2 and VOC readings should be updated and closer to the readings shown by your other CO2 and VOC measurement devices. Hope that helps!

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    Ok. I will leave the Thingy:52 connected overnight and then check the readings the next morning and will get back to you.

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    Hi Hemant. Be aware that it could take up to a day or so the first time the Thingy is turned on to get accurate VOC and CO2 measurements. Then, the next time you reset (i.e. power off and then power on) the device, it might take about 5-10 minutes to get accurate readings. I can confirm this with my Thingy. At the beginning, I was getting readings of 400 ppm and now they are up to 846 ppm. Let me know how it goes with both the CO2 and VOC measurements!

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