Automatic Weather Station


The automatic weather station consisting of 5 sensors and tipping bucket rain guage is installed at NARL. The sensors measure pressure, temperature, humidity, wind speed and wind direction. Except the pressure sensor and the rain gauge, the other sensors are mounted on a 3-m tower. Temperature compensated piezo-resistive pressure sensor is used to measure the pressure with a resolution of 0.1 mb. For humidity measurement, a thin film capacitance sensor is used which provides an accuracy of ± 3%. RTD type sensor is used to measure temperature with a resolution of 0.1o C. 3-cup rotor type sensor is used to measure wind speed with an accuracy of ± 1%. Potentiometer type sensor is used to measure the wind direction with a resolution of < 1o. A tipping bucket rain gauge provides rain rate information with a resolution of 0.5 mm.