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Difference between Different Types of Flow Meters

Comparison of Different Types of Flow Meters

Comparison of Flowmeters

Image Credits : toshiba.co.jp

Comparison of Flow Meters

Flowmeter 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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