Present Weather Detector PWD52

PWD52 provides a wide visibility measurement range and accurate present weather reporting.

Automated observation networks need to operate with maximum reliability. Maritime and aviation observing systems need to operate in extremely harsh conditions. Meteorological institutes face challenging productivity and performance requirements. Vaisala Present Weather Detector PWD52 answers these needs with a mixture of robustness, dependability, versatility, and reliability.

Accurate Visibility Measurement

Calibrated with reference to a highly accurate transmissometer, PWD52 uses the proven forward scatter measurement principle to measure meteorological optical range (MOR). The sensor optics are well-protected against contamination: the optical components point downwards and hoods protect the lenses against precipitation, spray, and dust. This weather-proof design helps sustain accurate measurement results.

Proven Measurement Principles

PWD52 identifies precipitation type by accurately estimating the water content of precipitation using Vaisala RAINCAP sensor element, and combines this information with optical forward scatter and temperature measurement. These three independent measurements are processed through sophisticated algorithms to produce an accurate evaluation of the precipitation type according to the WMO and NWS code tables.

Robust and Dependable

Three measurement methods are used in PWD52 continuously, independently, and simultaneously, which reduces false alarm rates to a minimum.

The identification of precipitation type is reliable due to sophisticated algorithmic processing of complementary data from multiple sources. These factors together produce exceptionally dependable data.

The downward-facing sensor hoods protect the optical surfaces from contamination, resulting in low maintenance needs and costs. The optional hood heaters prevent the build-up of ice and/or snow in the optical path.

Solid Track Record

Thousands of PWD series sensors have been installed all around the world. They have undergone rigorous test programs. In the field, PWD sensors have demonstrated very low failure rates. They have proved their robustness in the harshest climates and most demanding conditions, ranging from offshore to desert and from airport to roadside.