Oxygen analysis of gases

• US 2,805,191 A
• Filed: 10/14/1954
• Issued: 09/03/1957
• Est. Priority Date: 01/16/1952
• Status: Expired due to Term

• Current Assignee: Paul Hersch
• Original Assignee: Paul Hersch
• Inventors: Hersch, Paul
• Application Number:
  US03/462,346
• Time in Patent Office: 1,055 Days
• US Class Current: 205/785.5
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors
• CPC Class Codes: Y10T 436/209163 Dissolved or trace oxygen or oxygen content of a sealed environment

Claims

10. A METHOD FOR DETECTING AND MEASURING THE PRESENCE OF OXYGEN IN A GAS WHICH COMPRISES ESTABLISHING CONTACT BETWEEN A SUBSTANTIALLY STAGNANT, AQUEOUS ELECTROLYTE AND A BASE-METAL ANODE HAVING THE PROPERTY OF BEING ATTACKED BY THE ELECTROLYTE IN THE PRESENCE OF UNCOMBINED OXYGEN BUT NOT ATTACKED BY THE ELECTROLYTE IN THE ABSENCE OF UNCOMBINED OXYGEN, MAINTAINING A METAL CATHODE HAVING A PORTION OF ITS AREA FREE OF CONTACT WITH SAID ELECTROLYTE AND HAVING A PORTION OF ITS AREA PARTIALLY SUBMERGED IN SAID ELECTROLYTE THEREBY PROVIDING AT LEAST ONE LINE OF CONTACT BETWEEN SAID CATHODE AND SAID ELECTROLYTE, SAID CATHODE HAVING THE PORPERTY OF NOT BEING ATTACKED BY SAID ELECTROLYTE EITHER IN THE PRESENCE OR ABSENCE OF OXYGEN CONDUCTING A STREAM OF GAS CONTAINING UNCOMBINED OXYGEN PAST THE SAID LINE OF CONTACT THEREBY FORMING A THREE-PHASE BOUNDARY WHEREBY AN ELECTRIC CURRENT IS CAUSED TO BE GENERATED WHICH CURRENT IS A FUNCTION OF THE CONCENTRATION OF THE GASEOUS UNCOMBINED OXYGEN IN THE STREAM OF GAS ADJACENT THE CATHODE, AND MEASURING THE CURRENT GENERATED BETWEEN SAID ANODE AND CATHODE.