Chapter 3 ________________________________________________________________  Installation 
 
VAISALA ________________________________________________________________________ 47 
 
  1002-043   
Figure 21  Threading LM21 Cable 
17.  If the viewing direction of LM21 Background Luminance Sensor 
needs fine-tuning, it can be adjusted by turning the sensor's 
mounting bracket. If the desired LM21 orientation is not possible to 
obtain by turning the mounting racket, the FS11P rear panel can be 
adjusted by loosening the screws holding the clamps and rotating 
the rear panel of the radiation shield. Tighten the screws after the 
adjustment. 
 
  1001-128 
Figure 22  Mounting Interface Unit Enclosure