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User's Guide _______________________________________________________________________
108___________________________________________________________________ M210543EN-B
Electrical Specifications
Table 21
PWD22 Electrical Specifications
Property
Maximum power
consumption
Sensor electronics
Outputs
Output data
Auxiliary data
Optical Specifications
The operating principle of the device is to measure forward scatter at
an angle of 45°.
Table 22
Optical Specifications of the Light Transmitter
Property
Light source
Peak wavelength
Reference photodiode For light source control
Backscatter
photodiode
Eye safety
Description / Value
6 W, 12-50 VDC
Optional luminance sensor: 2 W, 24 V
Optional hood heaters: 65 W, 24 V
Lock-in amplifier.
LED power stabilizer.
Contamination monitor.
Lens heater.
Temperature sensor.
Serial data line may be used either as RS-232 or
RS-485 (2-wire) level signals.
Three relay controls (open collector).
Analog output
8-m power/data cable standard. The PWD22 end is
equipped with connector.
Automatic or polled data messages.
Visibility, present weather, precipitation, and status
data.
Automatic message type and interval is selectable
at 15 s ... n x 15 s (n < 18) intervals.
Low visibility alarms in the data messages. Three
adjustable alarm limits to set the three relay
controls.
Hardware status (fail/warning) in the data
messages. Third relay output can also be driven by
hardware status.
Description / Value
Near-infrared Light Emitting Diode
875 nm
For contamination and blockage measurement
Eye safe in accordance with International Standard
IEC/EN 60 825-1; edition 1.2
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Troubleshooting
