Erosion resistant reference electrode assembly

Claim 1

A SHIELD FOR PROJECTING A REFERENCE ELECTRODE FROM THE EROSIVE INFLUENCE OF AN AGITATED LIQUID IN WHICH SAID ELECTRODE IS IMMERSED COMPRISING: (A) A REFERENCE ELECTRODE; (B) A TUBULAR CONTAINER DIMENSIONED TO CLOSELY SURROUND SAID ELECTRODE AND HAVING AN OPEN LOWER END AND A CLOSED UPPER END, SAID CLOSED UPPER END HAVING AN APERTURE THEREIN FACILITATING PASSAGE THERETHROUGH OF AN ELECTRICAL LEAD CONNECTED TO SAID ELECTRODE; (C) A LIQUID PERMEABLE MEMBER SEALINGLY POSITIONED ACROSS THE OPEN LOWER END OF SAID TUBULAR CONTAINER FOR SUPPORTING THE REFERENCE ELECTRODE IN SAID TUBULAR CONTAINER; AND (D) PASSAGE MEANS EXTENDING OUTWARDLY THROUGH THE WALL OF SAID TUBULAR CONTAINER AND ONLY COMMUNICATING WITH THE PERIPHERY OF SAID LIQUUID PERMEABLE MEMBER TO PERMIT GAS TO ESCAPE FROM SAID PERMEABLE MEMBER WHEN SAID ELECTRODE IS IN OPERATIONAL POSITION.