Chapter 4 _______________________________________________________________ Installation
VAISALA ______________________________________________________________________ 105
8. Carry out the vertical alignment of the LM21.
NOTE
The final vertical orientation of the LM21 is slightly tilted. The
elevation angle should meet approximately 30° above the horizon.
Verify that no artificial light sources illuminate the LM21 in its viewing
direction. For details, refer to Background Luminance Sensor LM21
User's Guide.
Slightly loosen all four vertical alignment screws of the mounting
bracket using a hex socket wrench size 4. Adjust the vertical
alignment of the LM21 as intended and tighten all four vertical
alignment screws of the mounting bracket. See Figure 62 on page
106.
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