If the plate resistance drops below the adjustable sensitivity setting,
the built-in relay immediately drops out.
At the same time the integrated sensor heat-ing
When the sur-face has dried off sufficiently (resistance
drops below set value plus hysteresis) the automatic reset delay time
This reset time is regulated by an incorporated
light sensor which provides for an optimal adjustment to the current
The reset time is increased from approx. 5 min.
to up to 60 min. by darkness or by spell of bad weather.
This helps to avoid on the one hand unde-sireable
temperature increases in a glass house or on the otherhand e.g. to high
switching frequencies of the flap actuating motors.
From the moment when the reset time starts, up to
the moment when the sensor signals "rain again", the sensor heating
switches back to approx. 25% of its total value.
This heating beforehand serves to avoid a rain
signal during e.g. fog or dew.