Analytical Instrumentation & Environmental Monitoring


Vaisala weather transmitter

February 2012 Analytical Instrumentation & Environmental Monitoring

The Vaisala WXT520 weather transmitter measures barometric pressure, humidity, precipitation, temperature and wind speed and direction. To measure wind speed and direction, the transmitter has the Vaisala WindCap sensor that uses ultrasound to determine horizontal speed and direction. The array of three equally spaced transducers on a horizontal plane is a Vaisala specific design. Barometric pressure, temperature and humidity measurements are combined in the PTU module using capacitive measurement for each parameter.

The WXT520 precipitation measurement is based on the unique Vaisala RainCap sensor, which detects the impact of individual rain drops. The signals exerted by the impacts are proportional to the volume of the drops. Hence, the signal from each drop can be converted directly to the accumulated rainfall. The device measures accumulated rainfall, rain intensity and duration of the rain all in real-time. Transmitters are immune to flooding, clogging, wetting and evaporation losses in the rain measurement.



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