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:
Jan. 18, 2000
Filed:
Nov. 04, 1997
Applicant:
Inventors:
Peter B Lewis, North Attleboro, MA (US);
Norman Fonteneau, Acushnet, MA (US);
Assignee:
The Foxboro Company, Foxboro, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
7386112 ;
Abstract
A magnetic flowmeter has a tube for supporting fluid flow including a circuit for indicating when the tube is empty to prevent an erroneous flow signal from being provided by the flowmeter, as well as a diagnostic circuit indicating when electrodes in the flowmeter are partially fouled. The circuits include an amplifier connected to two electrodes in the tube and a variable resistor. In a normally operating mode, the amplifier produces an oscillating signal when the tube is empty, and in a diagnostic mode, the amplifier produces an oscillating signal when the electrodes are partially fouled.