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Working Principles and Common Types of Flow Meters

Working Principles and Common Types of Flow Meters

2026-05-11

Flow meters are used to measure the volume of fluid passing through a pipeline and are commonly used instruments in process control and trade settlement.

Classification by Measurement Principle

Volumetric flow measurement: The volume of fluid passing through a cross-section per unit time, such as turbine, vortex, and electromagnetic methods

Mass flow measurement: Directly measures the mass of the fluid, such as Coriolis and thermal principles

Differential Pressure Measurement: Calculates flow rate based on the pressure difference generated as the fluid passes through a throttling element

 

Common Types and Applications

Electromagnetic Flowmeters: Suitable for conductive liquids; measurements are unaffected by fluid density or viscosity

Vortex Flowmeters: Utilize the frequency of vortices generated as the fluid flows around an orifice; suitable for steam, gas, or liquid

Turbine Flow Meters: The impeller speed is proportional to the flow velocity; used for clean, low-viscosity liquids

Ultrasonic Flow Meters: Time-of-flight or Doppler methods; can be clamp-on mounted; non-contact measurement

Understanding the measurement characteristics of various flow meters helps in making an initial selection based on the medium and operating conditions.

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