Vaisala LT31, Руководство пользователя, Страница: 29 / 294

Chapter 2 __________________________________________________________ Product Overview
VAISALA _______________________________________________________________________ 29
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Figure 4 Measurement Head
The following numbers refer to Figure 4 above.
1 = Measurement head cover
2 = Measurement
unit
3 = Support unit
4 = Outer mast tube
This special setup protects the optical parts which are located inside the
measurement unit, from mechanical influences due to solar radiation or
wind load. This results in optimized alignment stability.
The transmitter and receiver units are equipped with an interface unit that
contains the power supply and all needed terminals. In case of the
receiver interface unit, the master CPU is installed additionally.
Furthermore, a PWD forward scatter sensor is an integral part of the
measurement system. This sensor is mounted to the measurement head of
the LT31 transmitter unit.
The LT31 transmitter unit consists of the following parts:
- Mast
- Transmitter interface unit including power supply and terminals