Electrical Specifications; Optical Specifications; Table 18 Pwd22/52 Electrical Specifications; Table 19 Optical Specifications Of The Light Transmitter - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________
100 _________________________________________________________________ M210543EN-E

Electrical Specifications

Table 18 PWD22/52 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 19 Optical Specifications of the Light Transmitter
Property
Light source
Peak wavelength
Reference photodiode
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 PWD22/52
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 light source control
For contamination and blockage measurement
Eye safe in accordance with International
Standard IEC/EN 60 825-1; edition 1.2