Chapter 4 _______________________________________________________________ Installation
VAISALA ______________________________________________________________________ 111
5. Now place the ladder behind the transmitter mast and check the
orientation of the support unit.
6. Loosen the two fastening screws (hex socket, size 4) at the right
side (operator's view) of the mast top. The complete support unit
must now be turnable. See Figure 52 on page 97.
7. Align the support unit horizontally onto the receiver mast. Use the
sight hole in the rear plate together with the sight pin. See Figure
53 on page 98.
8. Fix the two fastening screws for the support unit at the mast top
carefully. The support unit will not be moved again.
9. The sight must show now the measurement head of the receiver.
Otherwise the support unit position and/or the vertical alignment of
the mast have to be checked. Probably a slight tilting of the mast is
necessary due to foundation level differences.
Foundation Level Differences
Tilting Transmitter Mast
If the level of the transmitter foundation is significantly different, that is,
more than ± 20 cm, from that of the receiver foundation, the sight will
image an area below or above the receiver measurement head. In that
case, the transmitter mast has to be slightly tilted off the perpendicular
alignment.
1. Move the mast by turning the nuts above and below the base plate
on the front foundation screw. See Figure 66 below.
0401-088
Figure 66 Front Nut Adjustment to Tilt Mast
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