Vaisala WAA151 Installation Manual Page 53

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Chapter 2 ___________________________________________________________Product Overview
VAISALA ________________________________________________________________________ 51
FD12
9608-041
Figure 40 FD12 Visibility Sensor
The FD12 forward-scatter visibility sensor evaluates the
Meteorological Optical Range (MOR) by measuring the scatter of
infrared light in the air. Typical applications of FD12 are visibility
measurement at airports and onboard ships, fog detection and warning
for highways, and meteorological observations at remote locations.
FD12 consists of a transmitter, a receiver, and a controller. The
simplified mechanical design means minimum disturbance to the
sample volume of air. The compact construction and factory set
mountings ensure easy installation and eliminate problems with
startup adjustments.
FD12P
0105-033
Figure 41 FD12P Present Weather Sensor
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