Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-07-08
1996-01-30
Noland, Thomas P.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386112, 7386116, G01F 160
Patent
active
054873100
ABSTRACT:
An electromagnetic flowmeter of this invention includes a measurement tube for passing a fluid to be measured, alternating magnetic field application means for applying alternating magnetic field and periodically switching magnetic fields applied in a first direction on a plane perpendicular to a direction in which the fluid flows and in a second direction opposite to the first direction, sampling means for sampling electromotive force caused in the fluid by the magnetic fields in the first and second directions by plural times in the same direction in one period, and arithmetic means for deriving the flow rate by the arithmetic process by excluding a sampling value which is contained in the sampling values obtained by the plurality of sampling operations and which exceeds a preset range or replacing the same by a simulated value.
REFERENCES:
patent: 4106337 (1978-08-01), Trietley, Jr.
patent: 4856345 (1989-08-01), Mochizuki
patent: 5317926 (1994-06-01), Okaniwa et al.
Patent Abstracts of Japan, vol. 12, No. 278 (P-738), Aug. 1, 1988, JP-A-63 058 114, Mar. 12, 1988.
Patent Abstracts of Japan, vol. 16, No. 504 (P-1439), Oct. 19, 1992, JP-A-04 184 122, Jul. 1, 1992.
Patent Abstracts of Japan, vol. 17, No. 412 (P-1583), Jul. 30, 1993, JP-A-05 079 873, Mar. 30, 1993.
Artis Jewel V.
Kabushiki Kaisha Toshiba
Noland Thomas P.
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