Flow measurement is one of the components of metrology science and technology, which is closely related to national economy, national defense construction, and scientific research. In the production of the petroleum industry, flow measurement runs through the entire process from oil extraction, transportation, refining and processing to trade sales, and every link cannot be separated from flow measurement. Otherwise, the normal production and trade exchanges of the petroleum industry will not be guaranteed. In the chemical industry, inaccurate flow measurement can lead to imbalance in the distribution ratio of chemical components, inability to ensure product quality, and even serious production safety accidents. In the production of the power industry, the measurement and regulation of medium flow rates such as liquids, gases, and steam play an important role. The accuracy of flow measurement not only has great economic significance for ensuring the operation of power plants under optimal parameters, but also has become an important link in ensuring the safe operation of power plants with the development of high-temperature, high-pressure, and large capacity units. If the instantaneous feed water flow of a large capacity boiler is interrupted or reduced, it may cause serious dry pot or pipe explosion accidents. This requires the flow measurement device not only to achieve accurate measurement, but also to send out alarm signals in a timely manner. In the production of the steel industry, the flow measurement of circulating water and oxygen (or air) during the steelmaking process is one of the important parameters to ensure product quality.