Visibility Measurement Specifications; Weather Sensing Specifications; Table 20 Optical Specifications Of The Light Receiver; Table 21 Visibility Measurement Specifications - Vaisala PWD22/52 User Manual

Chapter 8 ____________________________________________________________ Technical Data
VAISALA ______________________________________________________________________ 101
Table 20 Optical Specifications of the Light Receiver
Property
Detector
Optical filter/window
Backscatter light source

Visibility Measurement Specifications

Table 21 Visibility Measurement Specifications
Property
Measurement range of
MOR
1)
Accuracy
PWD22
Accuracy
PWD52
Instrument consistency
Update interval
1) Meteorological Optical Range

Weather Sensing Specifications

Table 22 Weather Sensing Specifications
Property
Precipitation detection
sensitivity
Weather type identification
Weather type reporting
Precipitation intensity
measurement
Precipitation amount
measurement
Amount of new snow
Description / Value
Photodiode
RG780 glass
Near-infrared LED for contamination and
blockage measurement
Description / Value
10 ... 20000 m (PWD22)
10 ... 35000 m (PWD52)
+/-10%, range 10 m ... 10000 m
+/-15%, range 10 km ... 20 km
+/-10%, range 10 m ... 10000 m
+/-20%, range 10 km ... 35 km
+ 5%
15 seconds
Description / Value
0.05 mm/h or less, within 10 minutes
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
Code letters for precipitation, NWS (National
Weather Service, USA)
Range 0.00 ... 999.99 mm/h
Range 0.00 ... 99.99 mm
Range 0.00 ... 999 mm