Vaisala PWD22 - Environmental Specifications; Table 23 Environmental Specifications

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Optical Specifications
The operating principle of the device is to measure forward scatter at an
angle of 45°.
Table 19 Light Transmitter Optical Specifications
Property
Description / Value
Light source
Near-infrared Light Emitting Diode
Peak wavelength
875 nm
Reference photodiode
For light source control
Backscatter photodiode
For contamination and blockage measurement
Eye safety
Eye safe in accordance with International
Standard IEC/EN 60 825-1; edition 1.2
Table 20 Light Receiver Optical Specifications
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