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Chapter 2 __________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIEW
Introduction to Vaisala Present Weather
Detector PWD22/52
VAISALA _______________________________________________________________________ 15
This chapter introduces Vaisala Present Weather Detector PWD22/52
features, advantages, and the product nomenclature.
PWD22/52 is an intelligent, multi-variable sensor for automatic weather
observing systems. The sensor combines the functions of a forward
scatter visibility meter and a present weather sensor. PWD22/52 can
measure the intensity and amount of both liquid and solid precipitation. If
the detector is equipped with a background luminance sensor, it can also
measure ambient light.
PWD22/52 suitable for automatic weather station applications especially
for low-power requirement installations.
Table 3
PWD Sensor Series Model and Performance Table
Model
Visibility Sensor PWD10
Present Weather Detector PWD12
Visibility Sensor PWD20
Visibility Sensor PWD50
Present Weather Detector PWD22
Present Weather Detector PWD22M
Present Weather Detector PWD52
The versatility of PWD22/52 is achieved with a unique operating
principle. PWD22/52 measures an estimate of the precipitation water
content with a capacitive device Vaisala RAINCAP
combines this information with optical scatter and temperature
measurements. These three independent measurements together provide
sufficiently data for an accurate evaluation of prevailing visibility and
weather type.
Performance
Visibility range 10 m ... 2000 m
Visibility range 10 m ... 2000 m
4 different precipitation types
Visibility range 10 m ... 20000 m
Visibility range 10 m ... 35000 m
Visibility range 10 m ... 20000 m
7 different precipitation types
For Vaisala TACMET stations
Visibility range 10 m ... 35000 m
7 different precipitation types
®
Rain Sensor and
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