Vaisala WAT12 - Manual (Page 11)

Chapter 2 ____________________________________________ Product Overview
VAISALA___________________________________________________________9
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces WAT12 Analog Wind Transmitter
features.
Introduction to WAT12 Analog Wind
Transmitter
The WAT12 transmitter converts the digital data supplied
by the Vaisala 151 and 252 Series wind sensors, into two
industry standard analog current loops; one representing the
wind speed and the other the wind direction. The current
loops are suitable for connection to, for example, chart
recorders, analog or digital panel meters, analog inputs of
computers, or other instruments with an analog input
interface. The power to the sensors is also supplied through
the WAT12 transmitter. The transmitter accepts a wide
range of input power, from 12 to 28 VDC.
The WAT12 transmitter consists of a printed circuit board
unit in a junction box and a cross arm for mounting the wind
sensors, see Figure 1 on page 10. A 4-wire cable for the
wind speed and direction signals and power supply is
needed between the transmitter and the receiving end.
The loop current is user selectable. The loops are supplied
by high-side drivers with a return to the signal and power
ground; thus nearly any input type can be driven.