Study on the Measuring and Reading Mode of High Precision Thermometer in Hydraulic Engineering

Abstract

After the operation of large water conservancy projects, water temperature changes will have a significant impact on the surrounding ecological environment. In order to monitor the water temperature, a water temperature monitoring system covering the whole flow channel has been established in China's giant hydropower stations. In order to accurately measure the water temperature in the water level fluctuation area, a ± 0.1 ℃ water temperature gauge is selected as the front sensing device. Compared with traditional thermometers, high-precision thermometers are rarely used in projects. After investigation and comparison, platinum resistance thermometer has been applied in water conservancy projects. In view of the fact that there is no special manual measuring and reading equipment for the platinum resistance thermometer before the automation is connected during the construction period, a four wire temperature measuring and reading mode is proposed, which is applicable to the platinum resistance thermometer by using the existing hydraulic bridge, and the rationality of the measuring and reading mode is verified through the comparison of indoor tests.