Multiple tests failed to validate the water mass conservation within sealed small air containers. The water content grows while the container is heated and reduce when cooled. How come ? How does the humidity capacitive sensor behave if a group of water molecule coalesce together but the group remains airborne? Is the temperature a truly dry bulb temperature? Where to look to get the water mass conservation right?
I am not a programmer nor an electronic technician, so I picked up an assembled SparkFun Atmospheric Sensor BME280 with Arduino prototyping board. I used an I2C connection and Adafruit program library on Arduino program running on a Mac. The data was treated through and Excel sheet using functions from ASHRAE Psychrometric analysis to find the specific humidity W, expressed in kg of water / kg of air. Various containers were used to discard any effect of adsorbtion or generation of unwanted gas through the test setup. Here is an example of a test result.
Solved! Go to Solution.