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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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    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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