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HDC1080 - Relative Humidity Measurement

JP
Expert 3801 points
Other Parts Discussed in Thread: HDC1080

Hello Team, 

I was looking into the HDC1080, and had a question regarding as to how relative humidity is measured relative to temperature.

My understanding is that %RH is measured as a ratio between the pressure of the waver vapor at a specific temperature, and the max quantity of water vapor that the air can hold at that specific temperature. As seen in the snaa216 app note equation (1): 

Is this consistent with how the device determines the %RH, and if not is there any compensation that needs to be done?

Best Regards,

Javier Palomo

  • 0
    TI__Expert 5145 points

    Hi Javier,

    the formula:

    represents the physical definition of relative humidity.

    With the HDC1080 we calculates the RH% in indirect mode, taking advantage from the property of some polymers that change their capacitance in function of the relative humidity. Measuring the capacitance variations of our sensing element, we are able to obtain the relative humidity in the environment where the sensor is placed
    In our measurement chain we already consider all the necessary compensations, so you don't need to take care about them.

    Please let me know should you have any questions.

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    TI__Expert 3801 points

    Hello Carmine,

    Thank you for your quick response.

    My customer wanted to ensure that the reading did not need to be compensated due to temperature and from what you stated they will not need to.

    I appreciate the help!

    Best Regards,

    Javier Palomo