http//www.quantec-signals.com/en/onshore/accessory-and-peripheral-systems/visibility-meter-vaisala-pwd20/

Visibility meter Vaisala PWD20

The PWD20 visibility meter identifies different precipitation types, such as rain, drizzle, sleet, snow and other weather-related constraint factors such as fog, mist or haze caused by smoke and sand. It allows a reliable determination of visibility over a range from 10 to 20,000 meters and is designed for both onshore and offshore use.

Technical data

Functional principle Optical forward scattering
Measuring range(MOR) 10 – 20,000 m
Precision ±10 % (range 10 m...10 km) / ±15 % (range 10 km...20 km)
Serial ports RS-232, RS-485
Relay contacts 3 pieces, programmable visibility alarm thresholds and delays can be configured, error message
Analog exit 0 ...1 mA, 4 ... 20 mA
Supply voltage range electronics: 12...50 V DC, hood heating: 24 V DC/AC
Power consumption 3 w (at 12 V DC, incl. window heater), incl. hood heating: 65 w
Operating temperature -40 °C to +60 ºC
Operating humidity 0...100 % rF
Protection class IP 66
Dimensions W: 695 mm / H: 199 mm / D: 404 mm
Weight 3 kg
EMC according to EN61326-1: 1997 +Appendix 1: 1998 + Appendix 2: 2001
Approval recognized by the GCU, confirmed by DWD