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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).
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