Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2008-09-23
2008-09-23
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
C702S045000
Reexamination Certificate
active
11578209
ABSTRACT:
An electromagnetic flowmeter includes a measuring tube through which a fluid to be measured flows, electrodes which detect an electromotive force generated by a magnetic field applied to the fluid. An exciting coil applies, to the fluid, a time-changing magnetic field asymmetrical to a plane (PLN) which includes the electrodes and is perpendicular to the axial direction of the measuring tube. A signal conversion unit extracts a ∂A/∂t component from the resultant electromotive force of the electromotive force. A flow rate output unit removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity on the basis of the ∂A/∂t component, and calculates the flow rate of the fluid from the result obtained by removing the variation factor.
REFERENCES:
patent: 2007/0088511 (2007-04-01), Yamamoto
patent: 2007/0234820 (2007-10-01), Yamamoto
patent: 2007/0272030 (2007-11-01), Yamamoto
patent: 2008/0028867 (2008-02-01), Yamamoto
patent: 2004-108973 (2004-04-01), None
patent: 2004-108975 (2004-04-01), None
patent: WO 03/027614 (2003-04-01), None
Blakely & Sokoloff, Taylor & Zafman
Patel Harshad
Yamatake Corporation
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