Flow measurement is widely used in various fields such as industrial and agricultural production, national defense construction, scientific research, foreign trade, and people's lives. In the production of the petroleum industry, flow measurement runs through the entire process, from oil extraction, transportation, refining and processing to trade sales. Any link cannot be separated from flow measurement, otherwise normal production and trade exchanges in the petroleum industry cannot be guaranteed. In the chemical industry, inaccurate flow measurement can cause imbalance in the distribution ratio of chemical components, unable to ensure product quality, and even serious production safety accidents. In the production of electric power industry, the measurement and regulation of medium flow rates such as liquid, gas, and steam occupy an important position. The accuracy of flow measurement not only has great economic significance for ensuring the operation of power plants under the 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 feedwater flow of a large capacity boiler is interrupted or reduced, it may cause serious dry boiler or pipe explosion accidents. This requires that the flow measurement device not only achieve accurate measurement, but also send out alarm signals in a timely manner. In the production of steel industry, the flow measurement of circulating water and oxygen (or air) in the steelmaking process is one of the important parameters to ensure product quality. In light industry, food, textile and other industries, flow measurement is also indispensable.

In industrial sites, instruments for measuring fluid flow are collectively referred to as flowmeters or flowmeters. It is one of the most important instruments in industrial measurement. With the development of industry, the requirements for the accuracy and range of flow measurement have become increasingly high. In order to adapt to various applications, various types of flow meters have been introduced and widely used in industries such as oil and gas, petrochemical industry, water treatment, food and beverage, pharmaceuticals, energy, metallurgy, pulp and paper, and construction materials.