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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