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HDC2010: Humidity sensor heating and testing

Reginhard Wiegand
Prodigy 50 points
Part Number: HDC2010
Other Parts Discussed in Thread: SYSCONFIG,

Hello,

I would like ask about HDC2010 temp and humidity sensor testing. I used a library from TI SysConfig to create a program code for this sensor, so now temperature readings seem to be correct and also it reacts to temperature changes.

The problem is that when I put a water drop on the sensor, RH (relative humidity) value becomes 0%. Then I turn on integrated heating element, temperature readings from ~27 go to ~60 degrees Celsius and only then RH readings start to change from 0% to 30, 10 and then gets steady at ~6 %. Is it a correct humidity sensor working procedure? I assume that when a water drop is put on the sensor, it should show high RH value instead of 0. Also, high RH value could be used to detect condesate so then heater could be activated. Or does sensor show 0% RH (when some water is on it) because pure water prevents it from measuring humidity of environment?

I thank you for your answers in advance.

  • 0
    TI__Expert 3270 points

    Hi Reginhard,

    The HDC2010 is meant to measure the Relative Humidity in a non-condensing environment. If condensation does occur, the sensor might either read 100% or 0% RH. It is recommended to turn on the heater to burn away any condensation on the sensor. You can turn on the heater for a few minutes until the temperature reading is around 100C. If this doesn't improve the part, you can also try baking & rehydrating the part. 

    If any sort of chemical or water was directly poured on the sensor, the sensor polymer could have been damaged. Please refer to page 5 of the Silicon User Guide to see the list if chemicals to avoid while handling this part. 

    Regards,
    Pavani Tenneti