Vaisala LT31, Руководство пользователя

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User's Guide ______________________________________________________________________
30 __________________________________________________________________ M210667EN-C
- Support unit including the blower unit, weather protection hood,
support arm, measurement head cover, and an optional obstruction
light
- Transmitter measurement unit includes:
- Enclosure with a window heater and an enclosure cover with an
air duct
- Transmitter optics unit with an alignment mechanism,
measurement CPU (including the window receiver), main
transmitter module, and window transmitter module
- PWD forward scatter sensor
The LT31 receiver unit consists of the following parts:
- Mast
- Transmitter interface unit including power supply, terminals, and
master CPU
- Support unit including the blower unit, weather protection hood,
support arm, cover, and an optional obstruction light
- Receiver measurement unit includes:
- Enclosure with window heater and enclosure cover with air duct
- Receiver optics unit with an alignment mechanism,
measurement CPU (including the window receiver), main
receiver module, and window transmitter module
- Vaisala Background Luminance Sensor LM21 (optional)
Mast with Support Unit
The LT31 mast has a double-tube construction to prevent alignment
quality loss caused by single-sided solar radiation and wind load. The
measurement unit is mounted to the inner mast tube. All other parts are
mounted to the outer mast tube.
The frangibility of LT31 is achieved by using special mounting bolts
equipped with a predetermined breaking point.
All connection cables between the measurement head and the interface
unit are routed between the inner and the outer mast tube.