Product Description
Vaisala Present Weather Detector PWD12
- Accurate measurement of visibility
- Robust and versatile
- Easy to install
- Indicates the cause of reduced visibility
- Identifies precipitation type
- Measures the intensity and accumulation of precipitation
- Estimates snow accumulation
Thousands of Vaisala present weather and visibility sensors are installed around the world, working reliably and accurately in diverse applications and climates. In the Vaisala PWD-series of present weather detectors and visibility sensors, you will find the mix you require of visibility measurement range (MOR), characterization of reduced visibility, precipitation type identification, precipitation accumulation/intensity measurement, and report formats (WMO, NWS code tables). Proven Measurement Principles for Present Weather The Vaisala Present Weather Detectors PWD12 and PWD22 identify precipitation type by accurately estimating the water content of precipitation with a capacitive device (Vaisala RAINCAP® sensor element) and combining this information with optical forward scatter and temperature measurements. These three independent measurements are processed through sophisticated algorithms in order to produce an accurate evaluation of the weather type according to the WMO and NWS code tables. Accurate Visibility Measurement Calibrated with reference to a highly accurate transmissometer, Vaisala PWD-series sensors use the proven forward-scatter measurement principle to measure Meteorological Optical Range (MOR). The visibility sensor is well-protected against contamination: the optical components point downwards and hoods protect the lenses against precipitation, spray and dust. This weather-proof design of the PWD sensors provides accurate measurement results and reduces the need for maintenance. The optional hood heaters are recommended for wintry conditions to prevent ice and snow accumulation.
