Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1980-07-10
1983-02-01
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386117, 328165, G01F 160
Patent
active
043708927
ABSTRACT:
An electromagnetic flowmeter wherein a liquid to be metered is conducted through the flow tube of a primary to intersect a transverse magnetic field produced by an electromagnet. The resultant signal induced in the liquid is transferred to a pair of electrodes mounted at diametrically-opposed points on the tube. To avoid spurious signal components arising from stray couplings between the electromagnet and the loop constituted by the electrodes and the liquid bridging the electrodes, the coil of the electromagnet is energized by a low-frequency wave whose frequency is well below that of the standard a-c power line. And, to avoid noise components produced when the liquid being metered is a slurry containing solid particles which impinge on the surface of the electrodes, the flowmeter secondary includes a delayed automatic gain or smoothing network that is activated when a signal having excessive noise component is detected which persists for a predetermined period, activation serving to extend the response time of the secondary and thereby reduce the influence of the noise component thereon whereby the output of the secondary has a favorable signal-to-noise ratio.
REFERENCES:
patent: 3432761 (1969-03-01), Morine
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 3845398 (1974-10-01), Katz
patent: 3904971 (1975-09-01), Delagrange
patent: 3911776 (1975-10-01), Beigel
Ebert Michael
Fischer & Porter Co.
Ruehl Charles A.
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