Belfort AWOS, Maintenance Manual

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BELFORT
INSTRUMENT
Proprietary Information
Locate the True North Monument and lower the tower. Using a stepladder as necessary, sight
along the folded tower section, to assure it points to the True North Monument. Loosen the
set screw on the red pointer. Adjust its direction to point to the True North Monument.
Tighten the set screw.
.
7.
Press the “REFRESH” button on the Belfort AWOS HHDU and verify that the wind direction
is 360°. If the direction does not read 360°, verify that the vane is aligned parallel with the red
pointer and parallel to the long axis of the cross arm. If adjustments need to be made, proceed
with Steps 8 thru 13 below, else go to step 14.
8. Remove the three (3) red plastic plugs and loosen the three (3) socket head screws holding the
direction sensor to the cross arm.
9. Rotate the sensor bottle in the direction required to obtain a reading of 360°.
10. Wait for five (5) seconds, press the “REFRESH” button on the HHDU, and read the wind
direction. Repeat this process until a reading of 360° is obtained.
11. Tighten the three (3) socket head screws securely using the supplied Allen wrench.
12.
Press the “REFRESH” button again to verify that the wind direction still reads 360°.
13. Remove the rubber band from the vane and antenna.
14. Reinstall the three (3) red plastic plugs into the three (3) sensor mounting access-holes in the
cross arm.
Figure 4
Wind Direction Vane Alignment