Vaisala WMT700 - Manual (Page 76)

User's Guide ______________________________________________________________________
Alignment
WMT700 is permanently marked with the letter N and a north
arrow. You must align WMT700 in such a way that the arrow
points to the north. Misaligning WMT700 causes a wind direction
offset error in the measurement results, as shown in Figure 33 on
page 75.
To align WMT700:
1. Determine if the array of WMT700 is correctly aligned with
a compass or other similar method.
2. If the alignment is not correct, readjust the orientation as
follows:
- When installing WMT700 on a vertical mast, rotate the
FIX70 mounting kit so that the north arrow and the north
transducer point to the north in the measurement
location. Do not remove WMT700 from the mounting kit
during the alignment process. Tighten the bolts of the
FIX70 mounting kit.
- When installing WMT700 on a horizontal cross arm,
rotate the arm so that the north arrow and the north
transducer point to the north in the measurement
location.
Figure 32 below and Figure 33 on page 75 show the correct
alignment and the measurement error caused by the
misalignment of WMT700.
0208-025
Figure 32 Correctly Aligned WMT700
74 ___________________________________________________________________ M211095EN-E