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VAISALA ________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................ 9
About This Manual ................................................................... 9
Contents of This Manual ....................................................... 9
Version Information ............................................................. 10
Related Manuals ................................................................. 10
Documentation Conventions............................................... 10
Safety....................................................................................... 11
ESD Protection.................................................................... 13
Recycling ................................................................................ 13
Regulatory Compliances ....................................................... 14
Trademarks ............................................................................. 14
License Agreement ................................................................ 14
Warranty.................................................................................. 14
CHAPTER 2
PRODUCT OVERVIEW................................................................................ 15
Introduction to Vaisala Present Weather Detector
PWD22/52 ................................................................................ 15
Hardware Structure ................................................................ 16
Using PWD22/52................................................................. 16
Product Nomenclature........................................................... 17
CHAPTER 3
FUNCTIONAL DESCRIPTION..................................................................... 19
Optical Measurements ........................................................... 21
Optical Arrangement ........................................................... 21
Transmitter Unit PWT11...................................................... 21
Light Receiver ..................................................................... 22
Additional Measurements ..................................................... 22
Vaisala RAINCAP
®
Rain Sensor......................................... 22
Background Luminance Sensor PWL111 (optional)........... 23
BLSC Command ............................................................ 24
Continuous Mode...................................................... 24
Day/night Switch Mode ............................................. 24
Disabling PWL111 .................................................... 24
BLCAL Command .......................................................... 24
Temperature Sensor ........................................................... 25
Applications............................................................................ 25
Internal Monitoring................................................................. 26
Built-in Tests........................................................................ 26
Memory Tests...................................................................... 27
Signal Monitoring ................................................................ 27
Hardware Monitoring........................................................... 27
Monitoring Contamination ................................................... 28