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The ARC parameters can be configured via PCS10 or display and push-buttons:
Heating duration: Defines the time in which the monolithic measurement cell is intensively heated. A heating
time of at least 20 minutes (20 min = factory setting) is recommended if chemical pollution has occurred.
Recovery duration: The cool-down time is necessary for the sensing element to cool back down to ambient
temperature. The cool-down time should be >3 minutes (3 min = factory setting) in order to prevent measurement
errors.
During the ARC process (heating and cool-down time) the values on the outputs are frozen. In other words, the
measuring values at the outputs are kept constant during the ARC cycle.
The orange LED D5 at the main PCB near the USB interface is permanently lit during the ARC process. An
orange frame and text on the display also indicates the ARC process. On the status page of the display, the
remaining ARC process time in seconds is displayed.
T [°C]
T [°F]
ambient temperature
start ARC
manually/cyclic/externally
Fig. 5
ARC process in detail
PLEASE NOTE
If the defined cool-down time is too short, the measurements may be incorrect.
T [°C]
RH [%]
T [°F]
ambient humidity
ambient temperature
Fig. 6
ARC cycle with cool-down time too short
heating time
chem. loads (> 20 min)
freezing period of output signals
heating time
cool-down time
chem. loads (> 20 min)
freezing period of output signals
Humidity and Temperature Sensor for High Humidity and Chemically Polluted Conditions | 11
cool-down time
min. > 3 min
e.g. 2 min
User Manual HTS801
t [min]
humidity output
temperature output
t [min]
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