Vaisala WS425FG - Manual (Page 35)

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 33
0003-011 Figure 12 Sketch of Magnetic Declination
Compass Alignment with Mast
Adapter
The following steps aim the wind sensor when using the 1-inch adapter
for mounting:
1. Use a compass to determine that the N-S transducer heads of the
ultrasonic wind sensor are exactly in line with the compass. Adjust
the heads by moving them to the left or right. For the correct
ground position of the installer, see
Figure 14 on page 35 .
2. If the alignment is not correct, lower the wind mast or tower.
3. Loosen the three set screws of the clamp at the bottom of the sensor
alignment adapter and rotate the sensor so that the heads marked
with the N and with the S are exactly aligned to north and south
when the tower is set up. Tighten the clamp screws.
NOTE The source for the magnetic declination must be current as the
declination changes over time.