Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1981-12-22
1983-10-11
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
364510, G01F 160
Patent
active
044084978
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.
REFERENCES:
patent: 3380301 (1968-04-01), Mannherz et al.
patent: 4218915 (1980-08-01), Torimaru
patent: 4238410 (1980-12-01), Appel et al.
Ebert Michael
Goldstein Herbert
Hokushin Electric Works, Ltd.
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