Joseph J Flowers

US Patent:

42722454, Jun 9, 1981

Filed:

Dec 4, 1978

Appl. No.:

5/965901

Inventors:

Howard Diamond - Ann Arbor MI
Steven E. Enzer - Brooklyn MI
Joseph Flowers - Ann Arbor MI

Assignee:

Transidyne General Corporation - Ann Arbor MI

International Classification:

G01N 2756

US Classification:

23230B

Abstract:

A method and apparatus for measuring a chemical characteristic of a liquid such as its hydrogen ion activity or pH value. A disposable cassette having a reference and indicating electrode therein utilizes the same solution to first calibrate the device and then as an electrolytic bridge from the liquid sample to the reference electrode. The solution has the properties of a buffered pH and also provides a stable electrochemical environment around the reference electrode. In one embodiment, a volume of a liquid sample is placed into a capillary tube and the open end of the tube is then placed over the indicating electrode immersed in the solution. The electrical potential between the indicating electrode and the spaced reference electrode in the electrolyte solution provides a measurement of the pH value of the liquid when compared to the calibration potential previously measured without the liquid sample contacting the indicating electrode.

US Patent:

43429645, Aug 3, 1982

Filed:

Feb 14, 1980

Appl. No.:

6/121341

Inventors:

Howard Diamond - Ann Arbor MI
Steven E. Enzer - Brooklyn MI
Joseph Flowers - Ann Arbor MI

Assignee:

Transidyne General Corp. - Ann Arbor MI

International Classification:

G01N 2742

US Classification:

324450

Abstract:

A method and apparatus for measuring a chemical characteristic of a liquid such as its hydrogen ion activity or pH value. A disposable cassette having a reference and indicating electrode therein utilizes the same solution to first calibrate the device and then as an electrolytic bridge from the liquid sample to the reference electrode. The solution has the properties of a buffered pH and also provides a stable electrochemical environment around the reference electrode. In one embodiment, a volume of a liquid sample is placed into a capillary tube and the open end of the tube is then placed over the indicating electrode immersed in the solution. The electrical potential between the indicating electrode and the spaced reference electrode in the electrolyte solution provides a measurement of the pH value of the liquid when compared to the calibration potential previously measured without the liquid sample contacting the indicating electrode.