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 Flow Meters
Yokogawa's vortex flow meters are long-lasting and robust, offering field-proven sensor technology and high reliability to deliver improvements in plant efficiency and reduce OPEX.