| 摘要 |
An electromagnetic flowmeter includes a measuring tube through which a fluid flows, electrodes which detect an electromotive force generated by a magnetic field applied to the fluid. An exciting coil applies, to the fluid, a magnetic field asymmetrical to a plane (PLN) which includes the electrodes and is perpendicular to the axial direction of the measuring tube. A signal conversion unit extracts a ∂A/∂t component from the resultant electromotive force of the electromotive force. A flow rate output unit removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity on the basis of the ∂A/∂t component, and calculates the flow rate of the fluid from the result obtained by removing the variation factor. The exciting coil applies the magnetic fields including the plurality of frequency components to the fluid.
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