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

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ST Employee

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 2
ST Employee

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

ST Employee

Hi @RSoto.1​ ,