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:
Jun. 17, 1997
Filed:
Jul. 17, 1995
Robert K Schulz, Plymouth, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A magnetic flowmeter system provides a volumetric flow rate output and includes flowmeter electronics for coupling to a flowtube assembly. The flowtube assembly includes a coil which receives a magnetic field producing coil current from a supply circuit in the flowmeter electronics. The coil produces a magnetic field which generates an EMF in the field representative of flow. An EMF sensor senses the generated EMF and provides an output indicating flow. The supply circuitry is coupled to coil wires of the coil and is responsive to a control signal. A sensor senses the frequency response of the coil and generates a sensor output. A comparator compares the sensor output with a predetermined level and provides a comparator output based upon the comparison. Control circuitry provides the magnitude control signal to the current based upon the comparison.