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021197/07/19
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3 Mode of Operation
Precipitations in the form of drizzle, rain, snow, or hail are acquired by a light barrier system,
and trigger a switch signal.
An integrated event filter suppresses the triggering of the switch signal with accidental single
events, such as leafs, bird droppings, insects etc.
Output 1: (relay)
The relay signalizes the start and end of a precipitation period.
Start of Precipitation:
The recorded events (raindrops, hailstones, etc.) are compared with the set threshold value
(number of events) within a time frame of 50sec. On reaching the threshold value the relay is
switched.
The time frame is to be considered as gliding, i.e. you always look into the past. When after
the start of a precipitation event the number of events for the threshold value is reached
within a short time (< 50sec.) the relay is switched. This might occur even within a clearly
shorter time than 50sec.
End of Precipitation:
The reset of the relay, i.e. the end of the precipitation period, occurs when no more
raindrops, hail stones, etc. are detected after a defined delay.
Output 2: (optocoupler)
The optocoupler signalizes each event, as soon as a particle has been acquired by the light
barrier. The acquisition or signalizing is carried out without filtering and without delay.
Heating
The instrument is equipped with a heating system for extreme weather condition. This avoids
ice and snow forming on the housing surface. In addition, the surface retains a temperature
of >0° by means of a regulated heating.
Heating mode for:
Different modes of heating are possible:
Heating mode A
The heating is always active, the control temperature is at approx. 8°C
Heating mode B
The heating is active, when the precipitation monitor detected precipitation, and the ambient
temperature is at < 8°C.
Heating mode C
The heating can be switched ON or OFF externally, control temperature is at approx. 8°C
Heating mode D
The heating can be switched ON or OFF externally, and is active when the precipitation
monitor detected precipitation, and the ambient temperature is at < 8°C.
