Patent ID: 9021891
Filing Date: 2015-05-05
Classification: G01F

Abstract:
1. Vortex flow meter comprising: a measurement tube through which a medium can flow, an obstacle provided in said measurement tube for generating vortices in the medium, a deflection body provided in a region of action of said obstacle within said measurement tube, said deflection body being deflectable by pressure variations associated with vortices generated by said obstacle in the medium, at least one magnetic field generating device arranged outside of said measurement tube for generating a magnetic field in a region of said deflection body, and a magnetic field registering device for registering a magnetic field in said region of said deflection body provided outside of said measurement tube, wherein said deflection body having a magnetic permeability different from the magnetic permeability of the medium and being influencing said magnetic field, wherein said magnetic field generating device comprises a first excitation coil circumferentially surrounding said measurement tube and generating a magnetic field oriented in an axial direction of the measurement tube when a current is applied to it, wherein said magnetic field generating device additionally comprises a second excitation coil circumferentially surrounding the measurement tube next to the first excitation coil and generating a magnetic field oriented in an axial direction of the measurement tube when a current is applied to it, wherein said first excitation coil and said second excitation coil generate magnetic fields directed opposite to one another when a current is applied to them, and wherein said deflection body is arranged in a field-free region between said first excitation coil and said second excitation coil.