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VAISALA ________________________________________________________________________ 3
Table of Contents
CHAPTER 1
GENERAL INFORMATION.......................................................................... 15
About This Manual ................................................................. 15
Contents of This Manual ..................................................... 15
Version Information ............................................................. 16
Related Manuals ................................................................. 16
Feedback............................................................................. 16
Safety....................................................................................... 16
General Safety Considerations ........................................... 16
Product Related Safety Precautions ................................... 17
ESD Protection.................................................................... 19
Recycling ................................................................................20
Regulatory Compliances ....................................................... 21
Patent Notice .......................................................................... 21
Trademarks ............................................................................. 21
Warranty.................................................................................. 21
CHAPTER 2
PRODUCT OVERVIEW................................................................................ 23
Description and Purpose....................................................... 23
LT31 Key Features..............................................................23
Range Extension............................................................ 23
Auto-calibration .............................................................. 23
Auto-alignment............................................................... 24
Window Contamination Measurement........................... 24
Contamination Prevention..............................................24
Alignment Quality Control .............................................. 24
Double-mast Construction ............................................. 24
LED Light Source........................................................... 24
Self-diagnostics.............................................................. 24
Compatibility................................................................... 25
Introduction to LT31............................................................... 25
Mast with Support Unit........................................................ 30
Measurement Unit...............................................................32
Interface Unit....................................................................... 34
Equipment Nomenclature...................................................... 35
CHAPTER 3
FUNCTIONAL DESCRIPTION..................................................................... 39
Operating Principles .............................................................. 39
Concept of Visibility............................................................. 39
Meteorological Optical Range............................................. 40
Visibility Measurement ........................................................ 41
Auto-calibration ................................................................... 41
Auto-alignment .................................................................... 42
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