Chapter 2 __________________________________________________________ Product Overview
VAISALA _______________________________________________________________________ 15
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces Vaisala Present Weather Detector PWD22/52
features, advantages, and the product nomenclature.
Introduction to Vaisala Present Weather
Detector PWD22/52
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 Performance
Visibility Sensor PWD10 Visibility range 10 m ... 2000 m
Present Weather Detector PWD12 Visibility range 10 m ... 2000 m
4 different precipitation types
Visibility Sensor PWD20 Visibility range 10 m ... 20000 m
Visibility Sensor PWD50 Visibility range 10 m ... 35000 m
Present Weather Detector PWD22 Visibility range 10 m ... 20000 m
7 different precipitation types
Present Weather Detector PWD22M For Vaisala TACMET stations
Present Weather Detector PWD52 Visibility range 10 m ... 35000 m
7 different precipitation types
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
®
Rain Sensor and
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.
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