Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 17
The FS11 system is constructed of three main parts (see numbers 1–3 in
Figure 1 on page 16):
1. Measurement unit FSM102 includes the measurement CPU, optical
parts, transmitter, receiver, and protective hoods equipped with
heaters.
2. The interface unit FSI102 includes the communication CPU, power
supply, optional modem board, and optional backup battery.
3. The frangible pole mast includes the mechanical fixing onto the
foundation or some other flat surface, and the support for the
measurement unit and the interface unit's enclosure.
The FSM102 transmitter and receiver optics are permanently aligned
downwards and outwards to protect them from blowing dust, snow, and
rain. The scatter measurement angle is 42°. The enclosure of the interface
unit is normally mounted on the pole mast, which supports the
measurement unit.
Equipment Nomenclature
Table 3 FS11 Basic Nomenclature
Measurement unit assembly
Power supply, interfacing
assembly
Foundation kit
(allows 2.5 m measurement
volume height from ground) with
installation kit and accessories
Installation kit for frangible and
aluminum masts for existing and
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