Introduction to the principle and working mode of the orifice plate flowmeter

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　　Orifice plate flowmeter is a common flow measurement instrument, which is widely used in the flow measurement of various industrial fluid pipelines. Its principle is based on Bernoulli's theorem, which determines the flow rate of a fluid by measuring the pressure difference in the pipeline. This article will introduce the principle of orifice plate flowmeter and the way of work.

　　First, the principle of orifice plate flowmeter

　　Orifice plate flowmeter is a differential pressure flowmeter, based on the principle of Bernoulli theorem. Bernoulli's theorem is that when the fluid flows through different cross-sectional area of the pipe, the faster the fluid speed, the lower the pressure, and vice versa. Orifice plate flowmeters use this principle to measure the velocity and pressure of a fluid to determine the flow rate.

　　An orifice plate flowmeter usually consists of an orifice plate and two pressure sensors. An orifice plate is a thin plate installed inside a pipe with a hole in the centre, through which a pressure difference is created when the fluid passes. Two pressure sensors are installed in the upstream and downstream position of the orifice plate, used to measure the pressure difference between the upstream and downstream points.

　　Second, the orifice plate flowmeter working mode

　　The orifice plate flowmeter works in a very simple way. Fluid from the pipeline through the orifice plate, a pressure difference will be formed. The upstream pressure is higher and the downstream pressure is lower. This pressure difference is directly proportional to the velocity of the fluid, so the velocity and flow rate of the fluid can be determined by measuring the pressure difference.

　　In practice, orifice plate flowmeters usually need to be calibrated to ensure their accuracy and reliability. Calibration is usually performed by comparing the orifice plate flowmeter readings with those of other accurate flowmeters. Calibration can be achieved by adjusting the diameter of the orifice plate or the location of the hole.

　　Third, the application of orifice plate flowmeter

　　Orifice plate flowmeter is widely used in the flow measurement of various industrial fluid pipelines, such as chemical, petroleum, natural gas, water treatment, food and pharmaceutical fields. Because of its simplicity, accuracy and reliability, it is an economical and practical flow measurement instrument.

　　In conclusion, orifice plate flowmeter is a kind of flow metering instrument which uses Bernoulli's theorem to measure the fluid flow, and it works in a simple, accurate and reliable way. It is widely used in various industrial fluid pipelines and is an economical and practical flow measurement instrument.