Difference between Different Types of Flow Meters

Here we discuss about Comparison of Different Types of Flow Meter like Magnetic flow meter, Orifice Flow Meter, Ultrasonic flow meter, Turbine Flow meter, Vortex flow meter, Coriolis flow meter, Variable area flow meter.

Comparison of Different Flow Meters

Different Types of Flow Meters

Image Credits : toshiba.co.jp

Comparison of Flow Meters

Flow meter

Pipe/size

Gas/Liquid

Accuracy

Ideal for measuring

Principle

Orifice 1” – 48” Liquid/Gas 1% Mass flow / velocity Diff. Pressure
Venturi 6” – up Liquid/Gas 0.50% Mass flow / velocity Diff. Pressure
Turbine 0.5” – 2” Liquid/Gas 0.30% Mass flow / velocity Rotating blades produce pulses
Positive Displacement 1” – 24” Liquid 0.50% Mass flow Traps a specific volume
Magnetic 1” – 120” Liquid 0.2 – 1 % Mass flow Faraday’s Law
Ultrasonic 0.5” – 48” Liquid/Gas 1% Mass flow Speed of sound
Vortex 0.5” – 16” Liquid/Gas 1% Velocity Eddies produce pulses
Variable area 0.5” – 3” Liquid/Gas 1% Velocity Diff. Pressure
Coriolis 2” – 150” Liquid 0.50% Mass flow Coriolis principle
Pitot 3” – up Liquid/Gas 2% Mass flow / velocity Diff. Pressure

Note :

  1. Pipe/Size may vary from make to make, Above shared details are for reference only.
  2. For measuring Mass Flow, appropriate Temperature/Pressure compensation, Density Factors etc… to be considered in calculations of the Mass Flow, if the instrument primarily a volumetric flow measuring device.

Comparison between Turbine meter and Positive Displacement meter

Turbine Flow meter

Positive Displacement Flow meter

Indirect measurement Direct measurement
Requires upstream/downstream straight lengths No straight lengths required
Affected by fluid viscosity Free from viscosity effect
For a given small range, a smaller size compared to PD meter Larger size required to achieve a given flowrate range
 Lower operating/maintenance/investment costs  Higher operating/maintenance/investment costs

Credits : N Asyiddin

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3 thoughts on “Difference between Different Types of Flow Meters”

  1. we have observed in the table above ”Comparison of Flow Meters” that maximum pipe /size of coriolis flow meter is between 2” and 150” , please verify this information

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Difference between Different Types of Flow Meters

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