Vortex Flow Meter


A Vortex Flow Meter is a flow measurement device best suited for flow measurements where the introduction of moving parts presents problems.  Sensitivity to variations in the process conditions are low and with no moving parts have relatively low wear compared to other types of flow meters.

Vortex flow meters operate under the vortex shedding principle, where an oscillating vortexes occur when a fluid such as water flow past a bluff (as opposed to streamlined) body. The frequency that the vortexes are shed depend on the size and shape of the body. It is ideal for applications where low maintenance costs are important. Industrial size vortex meters are custom built and require appropriate sizing for specific applications.


A Vortex Flow Meter is an instrument used to measure the flow rate of a fluid.  It operates based on the principle of the Von Kármán effect, which states that when a fluid flows past an obstruction, it creates vortices that alternate on either side of the obstruction.

A vortex flow meter consists of a bluff body (such as a circular cylinder) placed in the flow stream. As the fluid flows past the bluff body, vortices are created, which cause pressure fluctuations in the fluid.  These pressure fluctuations are proportional to the flow rate of the fluid and can be measured by pressure sensors located downstream of the bluff body.

The advantages of vortex flow meters include their high accuracy, their ability to measure flow rates in both liquids and gases and their relatively low cost compared to other flow meters.  They are commonly used in applications such as water and wastewater treatment, HVAC systems, and process control in industrial plants.

However, vortex flow meters may not be suitable for applications where the fluid contains solid particles or where the flow rate is very low. Additionally, they may require periodic calibration to maintain their accuracy, and their accuracy may be affected by changes in fluid temperature and viscosity.

Vortex Flow Meter Working Principle

When the medium flows through the Bluff body at a certain speed, an alternately arranged vortex belt is generated behind the sides of the Bluff body, called the “von Karman vortex”.

Since both sides of the vortex generator alternately generate the vortex, pressure pulsation is generated.  It is generated on both sides of the generator, which makes the detector produce alternating stress.

The piezoelectric element encapsulated in the detection probe body generates an alternating charge signal.  The signal is the same frequency as the vortex, under the action of alternating stress.

Furthermore, the signal is sent to the intelligent flow totalizer to be processed after being amplified by the pre-amplifier.  It will realize displaying instantaneous flow and cumulative flow of fluid, communicating and controlling flow data and the microcomputer system.

In conclusion, a certain range of Reynolds number (2×10^4~7×10^6), the relationship among vortex releasing frequency fluid velocity V.

It also has a vortex generator facing flow surface width d can be expressed by the following equation:

Vortex Flow Meter Features

  • The unique isolated sensor design allows for replacement without breaking the process seal
  • Increase plant availability and reduce potential leak points with a gasket-free meter body with no moving parts
  • Eliminate downtime and maintenance costs associated with plugged impulse lines with a non-clog meter body design
  • Achieve vibration immunity with a mass balanced sensor and Adaptive Digital Signal Processing with visual filtering
  • A standard internal signal generator included in every meter simplifies electronic verification
  • All meters arrive pre-configured and hydrostatically tested, making them ready and easy to install
  • Simplify SIS compliance with available dual and quad Vortex

If the Vortex Flow Meter does not meet your application requirements pls look at another type of flow meter below

Turbine Flow Meter

Coriolis Flow Meter

Ultrasonic Flow Meter

Electromagnetic Flow Meter

Additional information

Weight N/A
Dimensions N/A

1/2" (0.12-2.02 Lb/Min), 1" (0.27-5.76 Lb/Min), 1-1/2" (0.63-13.57 Lb/Min), 2" (0.52-22.36 Lb/Min), 3" (1.14-49.27 Lb/Min), 4" (1.96-84.84 Lb/Min), 6" (4.44-192.53 Lb/Min), 8" (7.69-333.38 Lb/Min), 12" (17.38-753.69 Lb/Min)


Liquid, Gas


150LB (200PSIG @ <400F), 300LB (635PSIG @ <400F)


Flanged, Wafer, Sanitary, Compression


24VDC, 85-220VAC


Intrinsically Safe (EXi), Explosion Proof (EXd)


4-20 MA, 0-10KHZ, 0-10VDC (Optional)

Communication Protocol


Materials of Construction

SS304, SS316L

QC Test Certificate

No, Yes


0.2%, 0.5%




Cumulative Flow, Instantaneous Flow, Forward Flow, Reverse Flow









Flow-Application Form


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