Vaisala PWD22 - Visibility Measurement Specifications; Weather Sensing Specifications; Table 20 Optical Specifications of the Light Receiver; Table 21 Visibility Measurement Specifications

Chapter 8 ____________________________________________________________ Technical Data
VAISALA ______________________________________________________________________ 101
CHAPTER 8
TECHNICAL DATA
This chapter provides the technical data of PWD22/52.
Mechanical Specifications
Table 17 PWD22/52 Mechanical Specifications
Property
Description / Value
Dimensions
199 mm (h) × 695 mm (w) × 404 mm (d)
1)
Weight
3 kg
Mounting
To a metal rod or directly to the mast.
Material
Aluminum
1)
Height × width × depth (with maximum options)
Electrical Specifications
Table 18 PWD22/52 Electrical Specifications
Property
Description / Value
Maximum power
consumption
6 W, 12-50 VDC
Optional luminance sensor: 2 W, 24 V
Optional hood heaters: 65 W, 24 V
Sensor electronics
Lock-in amplifier.
LED power stabilizer.
Contamination monitor.
Lens heater.
Temperature sensor.
Outputs
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.
Output data
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.
Auxiliary data
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.