Patent ID: 6865956
Filing Date: 2005-03-15
Classification: G01F

Abstract:
1. An electromagnetic flowmeter characterized by comprising: a measuring pipe through which a fluid to be measured flows; an electrode which is arranged in said measuring pipe and detects an electromotive force generated by a magnetic field changing over time and applied to the fluid and flow of the fluid; an asymmetrical exciting unit which applies asymmetrical magnetic fields to the fluid on both sides of a plane serving as a boundary in said measuring pipe, the plane including said electrode, being perpendicular to an axial direction of said measuring pipe, and being defined as the boundary in said measuring pipe; a signal conversion unit which obtains, from an electromotive force detected by said electrode, an asymmetrical exciting characteristic parameter which depends on a flow rate of the fluid and does not depend on a flow rate measurement error; and a flow rate output unit which calculates the flow rate of the fluid for which the flow rate measurement error has been corrected on the basis of the asymmetrical exciting characteristic parameter.