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

RSoto.1 · ‎2020-09-28

Eleon BORLINI · ‎2020-09-29

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

View solution in original post

Eleon BORLINI · ‎2020-09-29

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 · ‎2020-10-02

Hi @RSoto.1 ,

do you have any feedback about your request?

-Eleon