Atulbhai S Shah

US Patent:

50857606, Feb 4, 1992

Filed:

Aug 6, 1990

Appl. No.:

7/563811

Inventors:

Mohammed Razaq - Hacienda Heights CA
Atulbhai S. Shah - San Dimas CA
Harold W. Pust - Huntington Beach CA

Assignee:

Teledyne Industries, Inc. - Los Angeles CA

International Classification:

G01N 2726

US Classification:

204431

Abstract:

An electrochemical gas sensor having a high surface area gas diffusing electrode defined for diffusing gases to be sensed to reach the catalyst surfaces of the electrode to provide the cathodic reduction of oxygen in a gas mixture undergoing sensing thereat. The sensor is adapted to sense trace levels of reactive gases in parts per billion. The sensor provides for ready purging of reactive gases from the electrolyte solution for the cell. The cell is essentially insensitive to the rate of flow of gas delivered to the cathode electrode and the minor mechanical stirring of the electrolyte solutions leading to output signals of improved signal-to-noise ratios more accurately signalling the concentrations of reactive gases, such as oxygen in gas mixtures.

US Patent:

51640538, Nov 17, 1992

Filed:

Apr 23, 1990

Appl. No.:

7/513091

Inventors:

Mohammad Razaq - Hacienda Heights CA
Atulbhai S. Shah - San Dimas CA
Harold W. Pust - Huntington Beach CA

Assignee:

Teledyne Industries, Inc. - Los Angeles CA

International Classification:

G01N 2726
G01N 27407

US Classification:

20415318

Abstract:

An electrochemical gas sensor having a solid ionic conductive electrolyte therein and adapted to sense trace levels of reactive gases in the parts per million range. The electrochemical sensing cell has a pair of catalytic electrodes attached to the opposite sides of the solid electrolyte. The sensing cell is supported and contained to permit the distribution of reactant gases over the electrode surfaces for reacting thereat and thereby providing an external electrical current flow representative of the quantity of the reactant gas undergoing sensing.