Chapter 2 __________________________________________________________ Product Overview
VAISALA _______________________________________________________________________ 15
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces Vaisala Present Weather Detector PWD22/52
features, advantages, and product nomenclature.
Introduction to Vaisala Present Weather
Detector PWD22/52
PWD22/52 is a 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 measures the intensity
and amount of both liquid and solid precipitation. If the detector is
equipped with a background luminance sensor, it also measures ambient
light.
PWD22/52 is typically used as a component of a weather observation
system. PWD22/52 is suitable for automatic weather station applications,
especially for low-power requirement installations.
Table 3 PWD Sensor Series Model and Performance
Visibility range 10 m ... 2000 m
Present Weather Detector PWD12
Visibility range 10 m ... 2000 m
4 precipitation types
Visibility range 10 m ... 20000 m
Visibility range 10 m ... 35000 m
Present Weather Detector PWD22
Visibility range 10 m ... 20000 m
7 precipitation types
Present Weather Detector PWD22M
For Vaisala TACMET stations
Present Weather Detector PWD52
Visibility range 10 m ... 35000 m
7 precipitation types
The PWD22/52 measures precipitation water content with a capacitive
Vaisala RAINCAP Rain Sensor and combines this information with
optical scatter and temperature measurements. Together, these three
independent measurements provide data for accurately evaluating the
prevailing visibility and weather.
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