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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

Orifice1” – 48”Liquid/Gas1%Mass flow / velocityDiff. Pressure
Venturi6” – upLiquid/Gas0.50%Mass flow / velocityDiff. Pressure
Turbine0.5” – 2”Liquid/Gas0.30%Mass flow / velocityRotating blades produce pulses
Positive Displacement1” – 24”Liquid0.50%Mass flowTraps a specific volume
Magnetic1” – 120”Liquid0.2 – 1 %Mass flowFaraday’s Law
Ultrasonic0.5” – 48”Liquid/Gas1%Mass flowSpeed of sound
Vortex0.5” – 16”Liquid/Gas1%VelocityEddies produce pulses
Variable area0.5” – 3”Liquid/Gas1%VelocityDiff. Pressure
Coriolis2” – 150”Liquid0.50%Mass flowCoriolis principle
Pitot3” – upLiquid/Gas2%Mass flow / velocityDiff. 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 measurementDirect measurement
Requires upstream/downstream straight lengthsNo straight lengths required
Affected by fluid viscosityFree from viscosity effect
For a given small range, a smaller size compared to PD meterLarger 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 comments

varun October 30, 2017 at 3:05 am

What about Cross-Correlation based Ultrasonic Flow Meter?

Reply
Junaid August 12, 2018 at 11:37 pm

Very informative according to interview

Reply
sofiane October 20, 2019 at 2:54 pm

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

Reply

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Difference between Different Types of Flow Meters

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