Vortex flow meter

US5321990A · kind A · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Michael Lang · Weil am Rhein, DE
• Karl-Heinz Schulz · Weil am Rhein, DE

Key dates

• Filing date: Feb 26, 1993
• Grant date: Jun 21, 1994
• Expiry date: Feb 26, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P5/01
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor measures the flow velocity and/or the volumetric flow rate of a fluid flowing in a pipe and in a measuring tube mounted therein, and includes a bluff body disposed in the conduit of the measuring tube, said bluff body being designed to generate Karman vortices and having a blind hole which is in communication with the conduit via passages formed in the bluff body, a vortex sensor inserted into the blind hole and having an electrodynamic transducer responsive to the vortexinduced pressure fluctuations, said electrodynamic transducer supporting a first oscillating body being a sensor sleeve which is deflectable by the pressure fluctuations, has a first cavity sealed from the fluid, and supports a permanent magnet within the cavity, and a second oscillating body movably disposed within the cavity so as to be isolated from the pressure fluctuations and supporting at least one coil located opposite the permanent magnet.