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14 CONTENTS

1.2.3 Precipitaion

Lambrecht 15153

User Information

The precipitation detector transmits signals to determine the beginning and

the end of precipitation and the duration of the period of precipitation.

Figure 1.8: Lambrecht Precipitation Sensor 15153

In the automatic weather station of the BGC-FTIR-Container this sensor is

used to report status and to transmit a control signal to the SPS. This is

to protect the solar tracker by closing the dome to avoid wetting of the sen-

sitive instrument. Precipitation in the form of drizzle, rain, snow or hail is

detected by means of an IR light barrier system and trigger a signal within

the connected electronics. A built-in incidence-ﬁlter smoothes the triggering

of swiching signals in case of individual incidences, as for example leafs, bird

droppings, insects etc. For this, a certain number of at least n incidences should

have occured within a time-frame of 50 sec. The number of drop incidences

(1...15) can be selected through the DIP switch 2 on the circuit board. For

details see section 1.2.3 on page 16. When precipitation ends, the switching

signal is reset after a selectable switch-oﬀ delay. The sensor is equipped with

a heating (temperature > 0 °C) system for extreme weather conditions. This

avoids ice and snow forming on the housing’s surface.

Maintenance

Dust and dirt may accumulate and form a layer on the sensing element. This,

however, is usually washed oﬀ by precipitation. The windows of the sensor

should be checked and cleaned on every maintenance visit.

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Vaisala PTB210 SERIES Manual de Instruções Página 99