Electrochemical electrode structure

Claim 1

AN ELECTRODE STRUCTURE FOR ELECTROCHEMICAL MEASUREMENTS WHICH COMBINES INDICATOR AND REFERENCE ELECTRODE FUNCITONS, COMPRISING: INNER AND OUTER TUBULAR MEMBERS SPACED TO DEFINE AN ANNULAR SPACE THEREBETWEEN FOR A SALT BRIDGE LIQUID, ONE OF SAID TUBULAR MEMBERS PROVIDING AN ELECTROCHEMICALLY SENSITIVE MEMBER AT ITS LOWER END; AN ANNULAR SEAL SEALING SAID TUBULAR MEMBERS AT A POSITION ABOVE SAID SENSITIVE MEMBER AND FORMING THE LOWER BOUNDARY OF SAID ANNULAR SPACE; A CONDUCTING LEAD EXTENDING DOWNWARDLY WITHIN SAID INNER TUBULAR MEMBER; A REFERENCE HALF-CELL IN SAID ANNULAR SPACE COMPRISING A CYLINDRICAL ELEMENT FORMED OF METAL SURROUNDING SAID INNER TUBULAR MEMBER IN AT LEAST THE LOWER PORTION OF SAID ANNULAR SPACE, SAID CYLINDRICAL METAL ELEMENT ACTING AS A SHIELD FOR SAID CONDUCTING LEAD IN ADDITION TO THE SHIELDING ACTION OF ANY SALT BRIDGE LIQUID IN SAID ANNULAR SPACE, SAID REFERENCE A HALF-CELL INCLUDING A COATING ON AT LEAST A PART OF SAID CYLINDRICAL ELEMENT, SAID COATING BEING FORMED OF A SALT OF SAID METAL; LIQUID JUNCTION MEANS EXTENDING THROUGH SAID OUTER TUBULAR MEMBER AT A POSITION ABOVE SAID ANNULAR SEAL; AND MEANS FOR ELECTRICALLY CONNECTING SAID CONDUCTING LEAD TO SAID ELECTROCHEMICALLY SENSITIVE MEMBER.