Thermistor

A small stainless steel needle containing a thermistor extends from the middle of the four sonic transducers in the center of the anemometer. The thermistor sits in open air. Instead of using a radiation shield to prevent solar loading, the temperature measurement is corrected by an energy balance equation that uses solar radiation and wind speed measurements. The equation calculates the true air temperature based on the solar load on the needle and the convective cooling of the thermistor to an accuracy of ±0.6 °C. Compare this error to the combined temperature and radiation shield errors of competitive units. For more information, refer to the ClimaVue™50—Correction of air temperature measurements from a radiation-exposed sensor White Paper available at: www.campbellsci.com/app-notes .