It converts pressure changes caused by the Karman vortex generated by a vortex shedder bar into an electrical signal. The vortex flowmeter uses that electrical signal to convert the Karman vortex into a flow rate and output it.
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.