Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1990-09-07
1992-02-25
Eisenzopf, Reinhard J.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386116, G01F 158
Patent
active
050902504
ABSTRACT:
An electromagnetic flowmeter has first and second magnetic field generating units. The first magnetic field generating unit applies a first magnetic field having a square wave of 4 to 8 Hz to a fluid to be measured. The second magnetic field generating unit applies a second magnetic field having a square wave of 25 to 35 Hz independently of the first magnetic field. A first electromotive force signal induced by the first magnetic field and a second electromotive force signal induced by the second magnetic field are detected by electrodes. A determination circuit determines whether the first electromotive force signal is normal and outputs a determination result. A first signal processing circuit generates a first flow rate signal on the basis of the first electromotive force signal. A second signal processing circuit generates a second flow rate signal on the basis of the second electromotive force signal. A calibration circuit outputs one of the first flow rate signal and the second flow rate signal calibrated by the first flow rate signal as a signal representing a flow rate of the fluid when the determination result represents a normal state, and outputs one of the second flow rate signal and the first flow rate signal calibrated by the second flow rate signal as a signal representing the flow rate when the determination result represents an abnormal state.
REFERENCES:
patent: 4206641 (1980-06-01), Takada
patent: 4470309 (1984-09-01), Wada
patent: 4644799 (1987-02-01), Tomita
ISA, 1988--Paper #88-1566/1-55617-139-0/88/1259-1267/$0+.50PP "New Intelligent Magnetic Flowmeter with Dual Frequency Excitation".
Eisenzopf Reinhard J.
Kabushiki Kaisha Toshiba
Sopbell E. L.
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