Guided wave radar level gauge is used for continuous contact measurement of medium with relatively small dielectric constant, such as liquid, slurry and particulate matter, and is suitable for situations where temperature and pressure change greatly and inert gas or steam exists. The intelligent radar level gauge is used to continuously measure the liquid level of liquid, slurry and granular materials in a non-contact way, and is suitable for situations where the temperature and pressure change greatly and inert gas or steam exists. It adopts microwave pulse (PTOF) measurement method and can work normally in industrial frequency band. Beam energy. How to convert the surface velocity into the average cross-sectional velocity has always been a difficult problem in the industry. Zheng Hang Company cooperated with Tsinghua University to develop and establish a hydrodynamic model. Through continuous experiments, the model was modified, and this non-contact radar current meter was developed in five years. Series products are non-contact open channel radar flowmeter developed and designed on the basis of radar current meter and radar liquid level meter of air travel company, combined with hydrodynamic model developed in cooperation with Tsinghua University. Flow algorithm: Q=V*S, q is the current flow of the section, v is the average flow velocity of the section, and s is the section area. For regular channels, combined with channel parameters, drawings and liquid level measured by radar level gauge, the cross-sectional area s is calculated by using conventional mathematical formula. For irregular channel section, S is obtained by tracing method and calculus calculation. The real-time measured liquid level, flow rate and cross-section average velocity are transmitted to the data monitoring center through RTU, which provides real-time decision-making basis for water conservancy and hydrological stations. It can accurately measure numerical values, and compared with ultrasonic level gauge, it has higher precision, more applicable working conditions and wider measuring range. It has a good inhibitory effect. It can also safely save all resources. No maintenance is needed, and the operability is very strong. It is also very convenient to maintain and the operation process is very simple. The application range is very wide.