USER'S GUIDE ____________________________________________________________________
20 ___________________________________________________________________ M211187EN-C
Location and Orientation
The main requirements for the location of FS11 are presented in the
following:
1.
The FS11 sensor should be sited in such a way that the
measurements will be representative of the surrounding weather
conditions.
- FS11 should be located at a minimum distance of 100 m from
any large buildings or other constructions that radiate heat
and/or obstruct precipitation droplets. The shade of trees should
also be avoided because trees may cause changes in the
microclimate.
2.
The site should be free of obstacles and reflective surfaces that will
disturb the optical measurement, as well as obvious sources of
contamination.
- It is recommended that there are no obstacles in the line-of-sight
of the FSM102 transmitter and receiver units (see Figure 2
below). If the transmitter beam is reflected back to the receiver
unit from obstacles, the sensor will indicate too low MOR
values because the reflected signal cannot be distinguished from
the real scatter signal. Harmful reflections can be detected by
rotating the measurement unit. These reflections change
depending on the measurement unit orientation and the visibility
reading will change accordingly.
1011-082
Figure 2
FS11 Recommended Location with Mast
FSAM250/FSFM250
