Swirl meter

Swirl flow meters combine the advantages of turbine and vortex flow meter technologies. They have a high turndown ratio and high accuracy (turbine). And they are highly reliable, robust and maintenance free (vortex)

Swirl meter Overview

The swirl flowmeter advances vortex flow technology by improving accuracy, simplifying installation, increasing turndown, and reducing the cost of ownership.

The swirl meter operates under the same technology as the vortex flow meter. It takes advantage of vortex shedding principles that occur when a flowing fluid comes up against a bluff obstacle in its path. Additionally, the swirl meter adds a “twist” in conditioning the fluid, which results in the reduced installation considerations mentioned above, while improving performance.

The swirl meter forces incoming fluid through a fixed swirl-inducing element located at the upstream inlet of the meter body. The “swirler” imparts a tangential velocity to the fluid and then accelerates the flow via a reduction in the meter body bore.

Swirl Flow meter Principle

A turbine-shaped inlet section forces the axial flow entering the flow meter into a rotational movement. A vortex core forms in the center of the primary rotation. A secondary rotation forms in the vortex core producing thread-like spirals.
The frequency of this secondary rotation is linearly proportional to the flow rate over a wide Reynolds Number range. Pressure variations resulting from the secondary rotation are detected by a piezo sensor and converted into electrical pulses.



Mass & Volumetric flow monitoring of most gas

  • The foremost advantage is fixed parts
  • Withstands changes in density, viscosity, temperature, and pressure
  • Easy to maintain with a low maintenance cost
  • Capable of operating in both directions

Easy to Install, lots of field installation options

Rugged, long-lasting design for the toughest applications


Pipe diameter:1/2″inch to 8″inch



Pressure rate:≤16 Bar,≤25 Bar,≤40 Bar



Ambient temperature:
Operating: -20° to 60°C
Storage: -40° to 65°C


Power supply:24VDC 100mA,3.6V Battery

Output signal:

  • 4-20mA
  • Pulse
  • User-definable pulse output for totalized flow

Digital communications: RS485, Hart

Hazardous-Area Location Enclosure


Flanged type

cast aluminum swirl meter for gas

Aluminum Body





  • inline swirl Flow meter 1“ inch drawing
  • inline swirl Flow meter 1.5“ inch drawing


  • RS485 Protocol
  • Hart Protocol

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