Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 95
7.
When the mast is aligned perpendicular, secure the base plate
again, fix the nuts to ensure a stable mast position.
8.
If the level of receiver and transmitter foundation surfaces is
identically in the frame of ± 10 cm, tighten the nuts as tight as
possible (see Figure 49 below). A torque of 60 ... 80 Nm is
recommended for the final fixture.
0401-053
Figure 49
Tightening Nuts
Setting Up Weather Protection Hood to Support Unit
To set up the weather protection hood to the support unit, follow the
instructions below. Alternatively, the enhanced weather protection hood,
if ordered (part of the optional material), is mounted according to a
separate instruction. For details, see the document LT31 Enhanced
Weather Protection Hoods Installation Guide in section Related Manuals
on page 16. Both hood types have identical mechanical fixtures.
When LT31 is ordered with heated hoods, the PWD forward scatter
sensor is also equipped with hood heating. In this case, the heating power
wires of the PWD connection cable are connected to the FSP102 power
supply inside the LTI111 transmitter interface unit as follows:
Connect the heating power wires of the PWD22 cable to FSP102 power
supply of LTI111 Transmitter Interface Unit:
1.
Connect wire YEL/BRN
and
wire WHT/YEL to FSP102 terminal
8 of X4.
2.
Connect wire BRN/GRN
and
wire WHT/GRN to FSP102 terminal
11 of X4.