When a vortex shedder is installed in a process flow line, the regular Karman vortex street is shed at the downstream of the shedder. This UYF200 Ultrasonic Vortex Flow Meter uses this principle to detect the shed vortices by ultrasonic waves. The associated converter provides a pulse output and a 4 to 20mA DC signal proportional to the flow rate.
Vortex flow meters were put into practical use in the 1970's; thus their history is relatively short. They have been mainly used at petrochemical plants because of their two main features, the fact that they do not have any mechanical moving parts and are maintenance-free. Yokogawa started research and development on the vortex flow meter before 1970.
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