Common flow meters | Types and principles of flow meters

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What are the common types of flow meters? A flowmeter is a commonly used measuring instrument with a wide variety of types, each with different functions and measurement ranges. The following are common types of flow meters: mass flow meter: direct type, such as calorimeter, angular momentum type, gyroscope type, and double impeller type, suitable for measuring small flow gases, but prone to contamination and corrosion. Indirect: The mass flow rate is obtained by combining a velocity flowmeter with a density meter, such as a throttling (or target) flowmeter combined with a density meter. Differential pressure flowmeter: such as orifice ridge regret plate flowmeter, which uses a combination of orifice plate and quantitative pump to achieve mass flow measurement. Common combinations include double orifice plate and four orifice plate with quantitative pump. Coriolis mass flowmeter: directly measures mass flow rate using the principle of Coriolis force generated by fluid flow in a vibrating tube. Electromagnetic flowmeter: Based on the law of electromagnetic induction, it is used to measure various corrosive liquids such as acids, alkalis, salts, flammable and explosive media, as well as industrial wastewater, pulp, mud, etc. Not suitable for measuring gases, vapors, and liquids containing a large amount of gas, as well as liquid media with low conductivity and high-temperature and high-pressure fluids. Vortex flowmeter: Based on the principle of fluid free oscillation, it is mainly used to measure the flow rate of industrial pipeline medium fluids (such as gas, liquid, vapor). It has the characteristics of low pressure loss, large range, and high accuracy. Positive displacement flowmeter: such as waist wheel, elliptical gear, piston, scraper, etc., calculates flow rate by measuring the time required for fluid to flow through a certain volume. Velocity flowmeter: including electromagnetic, ultrasonic, turbine, vortex street, vortex, rotor, etc., calculates flow rate by measuring fluid velocity balance. Variable area flowmeter: such as a rotor flowmeter, calculates flow rate by the pressure difference generated when fluid flows through a variable area channel. These flow meters have high precision and good stability within their respective application ranges, and are widely used in various fields such as petroleum, chemical, water treatment, environmental monitoring, etc. Choosing a suitable flowmeter requires consideration of factors such as the properties of the medium, measurement range, accuracy requirements, and installation conditions.

2.15 commonly used flow meters working principle diagrams, intuitive and clear

Flow meters play a key role in industrial production, closely related to national economy, national defense construction, and scientific research, and are crucial for measuring the flow rate of gases, liquids, steam and other media.

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