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Vaisala Visibility Sensors PWD10, PWD20 and PWD20W Vaisala VietNam ANS VietNam

Vaisala VietNam ANS VietNam Upgradable Visibility Sensors for accurate, traceable measurement of prevailing visibility
  • Accurate measurement of visibility
  • Robust and versatile
  • Easy to install

Visibility Sensor PWD20W for Wind Turbines:
Obstruction lights are used for marking the Wind Turbines for aviation safety. Some countries have established regulations for reducing the intensity of the obstruction lights basing on visibility. Wind Turbines can be equipped with Vaisala Visibility Sensor PWD20W, which is designed for this application. Several manufacturers have chosen Vaisala PWD20W due to its robustness and versatility.

Technical Specifications

 Technical Specifications

Visibility (MOR) measurement


     Measurement range

10 ... 2000 m (32 ft ... 1.2 miles)


 PWD20 and PWD20W:
     Measurement range

10 ... 20 000 m (32 ft ... 12 miles)

Operating environment

​Temperature ​-40...+60 °C



0...100 %RH

Inputs and outputs

​Outputs ​RS232, RS485, analog current, relay control
​Operating voltage ​12 VDC ... 50 VDC (electronics)
24 VAC or 24 VDC for heater option
​Power consumption
​     PWD10, PWD20
     and PWD20W
​3 W (electronics with dew heater @ 12VDC)




40.4 (w) x 69.5 (l) x 19.9. (h) cm
(15.91" (w) x 27.36" (l) x 7.83" (h))

​Weight ​3 kg (7 lb)

For complete specifications, please see the brochure or user guide in "Documents".