Chapter 4 _______________________________________________________________ Installation
VAISALA ______________________________________________________________________ 103
NOTE
The recommended orientation is preferably towards north in the
northern hemisphere and towards south in the southern hemisphere.
Depending on the superior RVR system layout, also an alignment
towards the runway end, in approach direction is possible. Direct
sunlight into the sensor must be avoided.
Verify that no artificial light sources illuminate the LM21 in its viewing
direction. For details, refer to Background Luminance Sensor LM21
User's Guide.
o Rotate the support arm to achieve the intended coarse
orientation. See Figure 59 below.
1104-101
Figure 59 Coarse Horizontal LM21 Alignment
o Secure the support arm in its final position with the respective
hex socket size 4 screw located slightly above the interface
unit. See Figure 60 below.
1104-102
Figure 60 Securing Support Arm
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