Chapter 4 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 37
2. Use a compass to determine that the transducer heads of WMT52
are exactly in line with the compass and that the arrow on the
bottom of WMT52 points to the north.
3. Tighten the fixing screw on the bottom of the sensor when the
bottom arrow is exactly aligned to north.
Wind Direction Offset
Make a wind direction correction in case the WMT52 cannot be aligned
in such a way that the arrow on the bottom points to the north. In this
case, the deviation angle from the true north needs to be given to the
WMT52.
1. Mount the sensor to a desired position, see section Mounting on
page 30.
2. Define the deviation angle from the north-zero-alignment. Use the
± sign indication to express the direction from the north line (see
example pictures).
3. Feed the deviation angle to the device by using the wind message
formatting command aWU,D (direction offset), see section
Checking the Settings (aWU) on page 95.
4. From now on, the WMT52 transmits the wind direction data by
using the changed zero-alignment.
0505-201
Figure 18 Wind Direction Offset
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