Vaisala PTB210 SERIES Manuale delle Istruzioni Scaricare il pdf (Pagina 20)

2.1.4 Precipitation - Lambrecht 15152

Function

In order to provide a detection of all kinds of precipitation the precipitation instru-

mentation is enlarged by the Lambrecht 15152. It is a very simple but reliable sensor

as shown in Fig. 2.8.

Figure 2.8: Lambrecht Rain Sensor 15152

[Manual - Electronic Rain Indicator 15152, 6/07]

The sensor‘s surface is heated in two levels. The ﬁrst level is switched on constantly

to prevent ice and dew formation. As soon as the sensing area is moistured, the

second heating level is switched on to make sure that the surface drys up as soon as

possible. After drying up the second level is switched oﬀ again. So a use at every

weather condition is implemented.

Measuring Principle

At the beginning of a precipitation event rain drops will cause a conductive connec-

tion between the two sensing electrodes to trigger the relay contacts. By this means

a relay is cut through and the controlling event is done. The SPS process this event

for further protection steps.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 136 137

Nessun commento

Vaisala PTB210 SERIES Manuale delle Istruzioni Pagina 20