Method of and apparatus for oxygen determination

Claim 1

AN ELECTRODE SYSTEM FOR USE IN THE METHOD OF DETERMINING THE CONCENTRATION OF OXYGEN IN SOLUTION IN AN ELECTROLYTE, SAID ELECTRODE SYSTEM COMPRISING A CYLINDRICAL BODY PORTION, A SILVER TUBE FORMING A POSITIVELY-CHARGED ELECTRODE MOUNTED WITHIN SAID BODY PORTION, A WIRE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM AND GOLD MOUNTED CO-AXIALLY WITHIN SAID SILVER TUBE AND FORMING A NEGATIVELY-CHARGED ELECTRODE, AN ELECTRICAL INSULATING MATERIAL FILLING THE SPACE BETWEEN SAID POSITIVELYCHARGED ELECTRODE AND SAID NEGATIVELY-CHARGED ELECTRODE, A SMALL BODY OF OXYGEN-FREE ELECTROLYTE SOLUTION MOUNTED IN CONTACT ONLY WITH ADJACENT END FACES OF SAID TUBE, SAID WIRE, AND SAID INSULATING MATERIAL, AND A MEMBRANE SPACED FROM CONTACT WITH SAID NEGATIVE ELECTRODE TO DEFINE A CHAMBER FOR CONFINING ONLY SAID OXYGEN-FREE ELECTROLYTE AND SEPARATING SAID OXYGEN-FREE ELECTROLYTE SOLUTION FROM THE ELECTROLYTE SOLUTION CONTAINING OXYGEN IN SOLUTION WHOSE OXYGEN CONTENT IS TO BE DETERMINED, SAID MEMBRANE BEING PERVIOUS TO OXYGEN BUT IMPERVIOUS TO DELETERIOUS CONSTITUENTS IN SAID ELECTROLYTE SOLUTION CONTAINING OXYGEN IN SOLUTION, RING MEANS MOUNTED ON AND SURROUNDING SAID BODY PROTION FOR CONTROLLING THE INGRESS AND IGRESS OF SAID OXYGEN-FREE ELECTROLYTE SOLUTION FROM THE CHAMBER DEFINED BY SAID MEMBRANE AND SAID ELECTRODE.