JIS Z 8766 "Methods of Flow Measurement by Vortex Flowmeters" lists the following points as features
1) The frequency output is proportional to the flow rate.
2) The Karman vortex oscillation phenomenon of the fluid is utilized, and basically no mechanical moving parts are required.
3) Wide flow measurement range.
4) Measurable for liquid, gas and steam.
5) Volumetric flow rate can be measured without being affected by the structure, density, temperature, pressure, etc. of the fluid.
6) Accuracy is specified based on Reynolds number, regardless of fluid type (liquid, gas, or steam), so accuracy can be guaranteed for any fluid by actual flow calibration prior to shipment with water.
Please refer to the article "Basics of Vortex Flowmeters: Measurement Principle and Measured Fluids".
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Vortex Flowmeters
Yokogawa has been synonymous with Vortex flowmeters since pioneering the industrial Vortex flowmeters from 1969. Even since then, Yokogawa has continued to be at the fore front of vortex technology; so, today, Yokogawa offers a large variety of Vortex flowmeters, including custom made designs.