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:
Mar. 01, 1988
Filed:
Dec. 08, 1986
Roy F Schmoock, Yardley, PA (US);
Fischer & Porter Co., Warminster, PA (US);
Abstract
An electromagnetic flowmeter in which the fluid being metered is conducted through a flow tube having a pair of electrodes, the fluid intersecting a magnetic field whereby the resultant voltage induced in the fluid is transferred to the electrodes to provide a signal indicative to flow rate. The magnetic field is created by a pair of pole pieces formed of 'hard' magnetic material. The pieces are placed at diametrically-opposed positions and are magnetically interconnected to define a magnetic circuit. Excitation pulses which alternate in polarity are periodically applied by respective magnet drivers to coils wound about the pole pieces to alternately magnetize the pieces in one direction and remagnetize the pieces in the reverse direction, thereby establishing the desired field. The duty cycle of the pulses is such as to reduce the average power requirements to a very low level. In order to operate the flowmeter from a standard 50 or 60 Hz power line, the line voltage is divided by an odd integer to permit the magnet drivers to be alternately triggered on the peak positive and peak negative crests of the power line voltage.