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. 13, 1990
Filed:
Jul. 05, 1988
Avron I Bryan, Cocoa Beach, FL (US);
Michael R Cushman, Kingsport, TN (US);
Other;
Abstract
A system for real time, on-line dissolved oxygen (DO) measurement of a process solution provides continuous data of the physical condition of the DO sensor and of the entire system performance. A DO sensor is disposed in the solution with two external electrodes adjacent thereto. A time-varying low level signal is applied to one electrode producing a current through the sensor membrane and grounded electrode, which is detected by a cross-correlation circuit to monitor the membrane impedance. The other electrode is periodically driven by a short, low level dc pulse, producing electrolysis of the water between the two electrodes, and generating a small, repeatable amount of oxygen ions. The sensor response is analyzed providing a direct indication of the sensor and system performance.