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RSoto.1
RSoto.1
Visitor II
September 28, 2020
Solved

Hts221 how long does the heater have to be ON to clear condensation

  • September 28, 2020
  • 2 replies
  • 939 views

..

    This topic has been closed for replies.
    Best answer by Eleon BORLINI

    HI @RSoto.1​ ,

    the exact time of the condensation recovery would depend on the "condensation level" on the sensor.

    Assuming the maximum condensation, I can share you an average characterization results:

    • Example: Fridge. Max condensation to ambient 68%:
      • without heater --> 800 seconds
      • with heater on --> 10 seconds

    Please note also that the amount of current flowing in the heater depends on the Vdd, and is proportional to the RH% reduction in a constant timeframe. For example, 1-minute heater ON at Vdd=3.3V drops the humidity of -23rH, while at Vdd=1.8V the drop is -8rH, same timeframe.

    -Eleon

    2 replies

    Eleon BORLINI
    Eleon BORLINIBest answer
    ST Employee
    September 29, 2020

    HI @RSoto.1​ ,

    the exact time of the condensation recovery would depend on the "condensation level" on the sensor.

    Assuming the maximum condensation, I can share you an average characterization results:

    • Example: Fridge. Max condensation to ambient 68%:
      • without heater --> 800 seconds
      • with heater on --> 10 seconds

    Please note also that the amount of current flowing in the heater depends on the Vdd, and is proportional to the RH% reduction in a constant timeframe. For example, 1-minute heater ON at Vdd=3.3V drops the humidity of -23rH, while at Vdd=1.8V the drop is -8rH, same timeframe.

    -Eleon

    Eleon BORLINI
    Eleon BORLINI
    ST Employee
    October 2, 2020

    Hi @RSoto.1​ ,

    do you have any feedback about your request?

    -Eleon

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