Adafruit BME688 - lower and higher detection limit of VOC

[salehnajafi70]

Hi.
I have bought a Adafruit BME688 from you, but I could not find the lower and higher detection limit of VOC concentration by this sensor, and it is highly important for us.

It would be my pleasure if you could provide me with some information in this regard.

[adafruit_support_carter]

Have you checked on Bosch's (the sensor manufacturer) website?
https://www.bosch-sensortec.com/product ... ors/bme688
and datasheet?
https://www.bosch-sensortec.com/media/b ... -ds000.pdf

[salehnajafi70]

Operation range for Temperature, Pressure and humidity are available in your suggested links. But there in no clear information about operation range for gas concentration

[adafruit_support_carter]

Unfortunately, that's all the information we have as well. It's likely you'll need to contact Bosch directly to see if they can provide that it.

[JimPl]

There's a lot of reading between the lines but the datasheet does give the standard by which the IAQ ratings output are matched against an absolute VOC standard set by the German goverment on the bottom of page 11, sort of. Even then, the data sheet's still unclear, but it at least gives a finger in the air to show how sensitive the sensor's supposed to be. The ppm levels cited, though, are quite concentrated, depending on what you're trying to measure. Perfumes and chemical fragrances, for instance, are a particular problem for me and can be smelled down to ppt or at least ppb levels depending the compound, well below the range this sensor says it's supposed to function at