Hardware Structure; Using Pwd22/52; Figure 1 Pwd22/52 Present Weather Detector - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________

Hardware Structure

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PWD22/52 is a self-contained instrument that can be fastened to the side
of the mast and into a cross arm using the mounting clamps.
Figure 1 PWD22/52 Present Weather Detector
The following numbers refer to Figure 1 above.
1 = Transmitter
2 = Controller/Receiver
3 = PWR211 Vaisala RAINCAP
(PWR111 in PWD22M)
4 = Pt100 temperature sensor in the tube
5 = Mounting clamp
6 = Hood heaters (optional)
7 = Place for Vaisala Luminance Sensor PWL111 (optional)

Using PWD22/52

PWD22/52 is typically used as a component of a weather observing
system.
The PWD22/52 output is either a digital serial interface or an analog
current signal. The digital serial interface can be configured into two
different operating modes: the sensor can be set to send a data message
automatically at selected intervals, or PWD22/52 can be polled by the
host computer. The same serial line is also used as an operator interface.
The analog current signal can be used to report the prevailing visibility.
Three relay controls can be used, driven by visibility limits.
The operator controls and checks the operation of PWD22/52 using a
maintenance terminal. A set of built-in commands and test routines are
provided for configuring and monitoring the multiple functions of
PWD22/52.
®
Rain Sensor
0308-002