Flow meter is one of the most important instruments in process automation instruments and devices. It is widely used in metallurgy, power, coal, chemical industry, petroleum, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life.
It is to develop industrial and agricultural production, save energy, improve product quality, improve economic efficiency and manage water. The important tools of peace play an important role in the national economy. In process automation instruments and devices, flow meters have two main functions: as the detection instrument of process automation control system and the total quantity table of measuring materials.