Vaisala WAA151 Installation Manual Page 34

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Installation Manual __________________________________________________________________
32 ___________________________________________________________________ M010114en-B
is changed in steps of 5.6°, one bit at a time to eliminate any
ambiguities in the coding.
A heating element in the shaft tunnel keeps the bearings above
freezing level in cold climates. Nominally, it provides 10 W of heating
power. It is recommended to use a thermostat switch in the sensor
cross arm for switching the heating power on below +4 °C.
0105-013
Figure 15 WAV151 Wind Vane
WAA252
The WAA252 Heated Anemometer is designed for environments
where a non-freezing sensor is required. Foil heaters are inserted into
each cup and in the cup wheel hub.
The transmission of heating power to the WAA252's rotor is
contactless, with no slip rings or brushes. This feature eliminates
sparks and excessive friction or wear. Power to the heaters is supplied
via a rotary transformer, with 26 kHz low-EMI sine wave.
Power consumption, typically 72 watts, is very low considering the
heating efficiency and the protection against freezing provided.
WAV252
The WAV252 Heated Wind Vane is a non-freezing sensor of novel
design. Its lightweight vane offers excellent sensitivity and fast
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