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3.4.3.
Condensation Guard (CG) against Temporary Condensation
Temporary condensation on the sensing element in highly humid environments is eliminated when a specified
RH set point (factory setting: acc. to order code) is reached. By intensive heating of the sensing element for 10
seconds occurring dew is evaporated. Due to its monolithic structure, the sensing element cools off quickly within
approximately 3 minutes and returns to its measurement function.
If condensation is still detected after the CG process, it restarts immedately or after a predefined lock time.
During the complete heating and cool-down process, the values on the outputs are frozen. In other words, the
measuring values at the analog outputs are kept constant during the CG cycle.
The.following.HTS801.types.support.the.Condensation.Guard:.T5 / T9 / T10.
PLEASE NOTE
The lock time has to be set according to the application needs. A too short lock time might result in
permanent freezing of the outputs.
The CG function can be preconfigured using the order code options. The lock time is configurable.
T [°C]
T [°F]
ambient temperature
start CP cycle
RH > RH setpoint
Fig. 7
CG process in detail
definable threshold e.g. 99 %
ambient humidity
ambient temperature
Fig. 8
CG cycles with a lock time of 30 min
heating time
temp. condensation (10 s)
RH [%]
T [°C]
heating time
10 s
cool-down time
min. > 3 min
freezing period of output signals
start CG cycle
cool-
interval./.30.min
down time
3 min
Humidity and Temperature Sensor for High Humidity and Chemically Polluted Conditions | 12
User Manual HTS801
t [min]
t [min]
t [min]
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