I am looking for the best way to expose the BME 688 to "clean air" for the purpose of reference. In my application I will start off using the devkit, and am putting the sensor in a contain that has only Zero Gas in it. Then an object is put into another box with Zero gas and the senor is also put that box with the object being tested. Zero Gas isn't extremely expensive but it isn't free. How clean does the air need to be to get the best results? Would Zero Gas be needed during calibration or could I get away with a Hepa Carbon filter? In the future product a sampling chamber will need to be purged with clean air to reduce the possibility of cross contamination.
