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NRG_34m_TallTower_Installation_Manual_and_Specifications_Rev_1.05.docx
19 April 2011
Figure 3
6. Have a crew member rotate the boom until it aligns with the north mark on the compass, and tighten the
boom.
7. Attach the wind vane with the north arrow index mark on the base pointing in the same direction as the north
mark on the compass. The #200P wind direction vane is designed to mount with a cotter pin and set screw
to a NRG sensor mounting boom. The cotter pin installs horizontally through drill holes in the boom and
vane, allowing the base of the vane to point in one of two directions, toward the tower or away from the
tower. See Figure 4.
Figure 4
8. When you raise the TallTower, the north arrow on the base of the wind vane will point to true north.
9. Use the compass to verify your settings. If necessary, adjust the position of the mounting boom before
raising the TallTower.
BOOM
NORTH MARK
TOWER, VIEWED
FROM TOP
COMPASS
BEARING
MARK
UP
