Chapter 3 ______________________________________________________ Functional Description
VAISALA _______________________________________________________________________ 61
- Controlling the window heater
- Downloading software
Optional Equipment Descriptions
Background Luminance Sensor LM21
The LM21 sensor offers the means for measuring ambient light level or
background luminance in RVR applications. The sensor is mounted to
the LM21 support arm, which is attached to the mast construction of the
LT31 receiver unit.
The support arm can be rotated for coarse horizontal orientation of the
LM21 while the mounting bracket allows fine horizontal and vertical
alignment.
The installed background luminance sensor is shown in Figure 28 below.
1104-095
Figure 28 Installed Background Luminance Sensor LM21
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