10.4
Switching on the device
In order to guarantee high long term stability of the dew point probes, the sensor element is
cyclically heated up. The heating takes place in every 13 h for a period of approx. 5 min.
each after which the sensor passively cools down again to ambient conditions.
During heating, the message "HEAT “ appears on the display and during passive cooling
down up to ambient temperature the message "COOL “ appears:
Status of the device
View of display
The sensor element is getting heated up.
The device waits, until the sensor element is cooled down
again.
The heating up is re-started at each connection of the power supply and thereafter again in
every 13 hours. During the entire cycle, the last measurements are held up and no further
measurement are done, and therefore, during this time span, no alarm signal comes up in
the case of limit overshooting. Only after the heating/cooling cycle is completed, the device
further continues with the measurement and alarm evaluation.
