Vaisala WAT12, User Manual

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2. Product overview
2.1 WAT12 Analog Wind Transmitter
WAT12 analog wind transmitter converts the digital data supplied by Vaisala WA15 and WA25
wind sensors into 2 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. Sensor power is also supplied through WAT12
transmitter. The transmitter accepts a wide range of input power: 12 … 28 VDC.
1 Flange for mounting Vaisala anemometer
2 Junction box containing the circuit box
3 Flange for mounting Vaisala wind vane
WAT12 consists of a printed circuit board unit in a junction box and a cross arm for mounting
the wind sensors. 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.
2.2 Safety
This product has been tested for safety and approved as shipped from the factory. Note the
following precautions:
Chapter 2 – Product overview
7