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    BME280 Temperature and humidity validation procedure failed. Any suggestion?

    BME280 Temperature and humidity validation procedure failed. Any suggestion?

    Nray
    New Poster

    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.

    Nray_1-1618352126809.png         Nray_2-1618352160478.png

     

     

    5 REPLIES 5

    BSTRobin
    Community Moderator
    Community Moderator

    Hello Nary,

    For your test environment, you have to ensure your test environment is correct.

    If you are developping a product, you'd better contact local technical support to give you suggestions.

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