The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2005
Filed:
Jul. 30, 2003
Ichiro Mitsutake, Tokyo, JP;
Ichiro Mitsutake, Tokyo, JP;
Yamatake Corporation, Tokyo, JP;
Abstract
In a two-wire electromagnetic flowmeter, an exciting coil generates a magnetic field in a direction perpendicular to the flowing direction of a fluid that flows through a measurement tube. A flow measuring output circuit adjusts an output current that flows to a pair of power supply lines to which an external power is supplied, in accordance with a flow measurement value obtained on the basis of a signal electromotive force which is generated in a direction perpendicular to the flowing direction of the fluid that flows through the measurement tube and the direction of the magnetic field generated from the exciting coil. An exciting circuit is connected in series with the flow measuring output circuit between the pair of power supply lines and supplies part of the output current to the exciting coil as an exciting current. In the exciting circuit, an exciting voltage circuit generates an exciting voltage between first and second lines. An exciting current adjustment circuit adjusts the value of the exciting current in accordance with the magnitude of the output current adjusted by the flow measuring output circuit. A capacitor is connected in parallel with the exciting voltage circuit between the first and second lines.