The leaf wetness sensor serves to determine dew and surface wetness on leaves. An absorbent test sheet fastened in the sensor takes up the rain water and forms an electrical resistance dependent on the wetting degree. This resistance is measured in connection with two Crozat electrodes and from this the leaf wetness is calculated in %, as well as the leaf wetness duration in minutes .
The leaf wetness sensor operates with a test sheet from a special paper felt. This test sheet must be checked and exchanged in regular intervals (every three months).
By the standard current output the sensor is therefore easy in the automation range
Measuring range: 0... 100%
Range of application: 0... +60°C
Electrical Output: 4 ... 20mA
Operating voltage (brown): +15... +30 V DC
ground GND (white),
shielded two-wire cable: 2m