RAIN SENSOR MODEL 420 pages

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Measurement principle This rain sensor has been developed for the
detection of precipitation like rain and snow.
When precipitation falls on the green sensor sur-
face the output (Open collector) will switch on to
GND (Ground).
The green coating is especially developed for
protection against copper (or other metal) and
other kinds of pollution.
The rain sensor is equipped with a circuit thatheats the surface a few degrees above ambient
temperature. This assures that the rain sensor is
not sensitive for fog and dew, also it will help dry-
ing the surface after the precipitation has stopped
falling (and output will switch faster to no preci-
pitationӔ).
The rain sensor can be equipped with a wind
shield (option), which prevents the wind from
interfering with the measurements. >
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