User`s guide

Chapter 6 ____________________________________________________________ Technical Data
VAISALA ______________________________________________________________________ 129
Present Weather Detector PWD11A
Table 55 PWD11A Present Weather Detector Specifications
Property Description/Value
Measurement range of
MOR
10 ... 20 000 m (32 ... 65 600 feet)
Accuracy
±10 %, range 10 ... 10 000 m (<32800 ft)
±15 %, range 10 ... 20 km (32800 ... 65600 ft)
Maximum power
consumption
15 W without heating,
max 20 W 10 ... 50 VDC
Time constant 60 seconds
Update interval 15 seconds
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 4680Weather type reporting
Code letters for precipitation, NWS (National
Weather Service, USA)
Range 0.00 ... 999 mm/hPrecipitation intensity
measurement
Accuracy ±30 % (range 0.5 ... 20 mm/h, liquid
precipitation)
Sun orientation Sunlight into the light receiver must be
avoided
Material Anodized aluminum, black
Wind speed Up to 60 m/s (116 knots)
Operating temperature
range
-40 ... +55 °C (-40 ... 131 °F)
Operating humidity range Up to 100 %RH
Dimensions w × d × h 720 × 320 × 220 mm (28.3 × 12.6 × 8.66 in)
Weight 2.8 kg (6.17 lb.)