Donald A Sayles

US Patent:

40986500, Jul 4, 1978

Filed:

Nov 8, 1976

Appl. No.:

5/739713

Inventors:

Donald A. Sayles - Pittsburgh PA

Assignee:

Thermo-Lab Instruments, Inc. - Pittsburgh PA

International Classification:

G01N 2746

US Classification:

204 1T

Abstract:

The moisture content of a gaseous mixture containing oxygen and the amount of other constituent gases in said mixture are determined by measuring, with an electrochemical cell, the ratio of oxygen partial pressures of a sample flow of said mixture and a comparison flow of a mixture of gases differing from said sample flow only by the reduction of the moisture content to a known level or, if moisture is not present, the reduction to a known level of the content of such other gaseous constituent. Also, provision is made to permit determining the amount of free oxygen in said gaseous mixture.

US Patent:

RE292095, May 10, 1977

Filed:

Dec 16, 1975

Appl. No.:

5/641234

Inventors:

Donald A. Sayles - Pittsburgh PA

International Classification:

G01N 3100
B01K 300

US Classification:

204 1T

Abstract:

A loop type sample gas flow conduit has an inlet opening that is connected to an opening in the gas main passageway and an outlet opening connected to a second opening in the main gas passageway. The sample gas flow conduit has a gas inlet leg and a gas outlet leg arranged at spaced relation to each other. A heater element surrounds a portion of the gas inlet leg and a suitable temperature control device provides a temperature differential between the gas inlet leg and the gas outlet leg so that a sample stream of gas is withdrawn from the stream of gas in the main passageway by convection and at a preselected flow rate. An electrochemical sensing cell is positioned in the gas inlet leg and continuously determines the oxygen partial pressure of the gas flowing through the sample gas flow conduit.