Vaisala PTB210 SERIES Manuel d'instructions télécharger pdf (Page 18)

ter. This information of changing by time is going to be processed in the connected

microcontroller in order to have an analog output for wind speed. Unfortunately,

there are no further detailed information about the measuring principle from the

manufacturer.

2.1.3 Precipitation - Lambrecht 15153

Function

Figure 2.6 shows Lambrecht’s precipitation detector. This sensor transmits signals

to determine the beginning and the end of precipitation and the duration of the

period of precipitation.

Figure 2.6: Lambrecht Precipitation Sensor 15153

[Manual - Electronic Precipitation Indicator 15153, 1/07]

In the BGC-FTIR-System this sensor is used to report status and to transmit a

control signal to the SPS to protect the solar tracker by closing the dome in order

to avoid wetting of the sensitive instrument. The sensor is equipped with a heating

system for extreme weather conditions. This avoids ice and snow forming on the

housing’s surface and increases the reliability of the system.

Measuring Principle

Precipitation in the form of drizzle, rain, snow or hail is detected by means of an IR

light barrier system as shown in Fig. 2.7.

Infrared radiation is send and received by a photo diode. If this event is cut through

a signal is triggered within the connected electronics and reports precipitation.

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Vaisala PTB210 SERIES Manuel d'instructions Page 18