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Abstract

An electromagnetic flowmeter for measuring the flow rate of a ferromagnetic slurry which is conducted through a flow tube having electrodes mounted thereon, the slurry intercepting a magnetic field to induce a signal in the electrodes which depends on flow rate. The field is established by an electromagnetic circuit whose core has a gap defined by the tube, an excitation coil being wound about the core. The magnetic resistance of the circuit changes as a function of the ferromagnetic concentration of the slurry, this change affecting the inductance of the coil. To provide an output signal which accurately reflects flow rate regardless of ferromagnetic concentration, the output signal is corrected in accordance with the changing inductance of the excitation coil.

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First Claim