Vaisala PWD22 User Manual

Chapter 8 ____________________________________________________________ Technical Data
VAISALA ______________________________________________________________________ 101
Table 20 Optical Specifications of the Light Receiver
Property Description / Value
Detector Photodiode
Optical filter/window RG780 glass
Backscatter light source Near-infrared LED for contamination and
blockage measurement
Visibility Measurement Specifications
Table 21 Visibility Measurement Specifications
Property Description / Value
Measurement range of
MOR
1)
10 ... 20000 m (PWD22)
10 ... 35000 m (PWD52)
Accuracy
PWD22
+/-10%, range 10 m ... 10000 m
+/-15%, range 10 km ... 20 km
Accuracy
PWD52
+/-10%, range 10 m ... 10000 m
+/-20%, range 10 km … 35 km
Instrument consistency + 5%
Update interval 15 seconds
1) Meteorological Optical Range
Weather Sensing Specifications
Table 22 Weather Sensing Specifications
Property Description / Value
Precipitation detection
sensitivity
0.05 mm/h or less, within 10 minutes
Weather type identification 7 different types of precipitation (rain, freezing
rain, drizzle, freezing drizzle, mixed rain/snow,
snow, ice pellets)
Precipitation (unknown type)
Fog (mist), haze (smoke, sand) or clear
WMO code table 4680 Weather type reporting
Code letters for precipitation, NWS (National
Weather Service, USA)
Precipitation intensity
measurement
Range 0.00 ... 999.99 mm/h
Precipitation amount
measurement
Range 0.00 ... 99.99 mm
Amount of new snow Range 0.00 ... 999 mm

Vaisala PWD22 Specifications

General

Brand	Vaisala
Model	PWD22
Category	Weather Station
Language	English