Campbell Scientific WXT520 WXT520 Weather Transmitter - Page 7
Introduction, Cautionary Statements, Initial Inspection, Overview - vaisala
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WXT520 Weather Transmitter 1. Introduction The WXT520 Weather Transmitter, manufactured by Vaisala, measures wind speed and direction, precipitation, barometric pressure, temperature, and relative humidity-all in a single device that has no moving parts. The WXT520's SDI-12 signal can be measured by any of our SDI-12 equipped dataloggers. The WXT520 is about the size of our larger Gill radiation shield, making it ideal for use with our CR200(X)-series dataloggers in applications requiring quick, short-term deployment. However, the WXT520 is not intended for weather stations that require research-grade performance. Before installing the sensor, please study • Section 2, Cautionary Statements • Section 3, Initial Inspection 2. Cautionary Statements • Although the WXT20 is rugged, it should be handled as precision scientific instrument. 3. Initial Inspection • Upon receipt of the WXT20, inspect the packaging and contents for damage. File damage claims with the shipping company. 4. Overview 4.1 Wind Speed and Direction The WXT520's wind sensor consists of three equally spaced transducers that produce ultrasonic signals. Wind speed and direction are determined by measuring the time it takes for the ultrasonic signal of one transducer to travel to the other transducers. Wind direction is not calculated when the wind speed drops below 0.05 m/s. In this case, the last calculated direction output remains until wind speed increases. The computed wind speeds are independent of altitude, temperature, and humidity. The WXT520 is preconfigured to provide the minimum, average, and maximum values for both wind speed and direction. Default wind speed units are m/s. 4.2 Precipitation The WXT520 uses the RAINCAP® Sensor to measure accumulated rainfall, rain intensity, and rain duration. Precipitation is measured one raindrop at a time. Whenever a raindrop hits the precipitation sensor, an electrical signal is produced that is proportional to the volume of the drop. 1