Abstract A hydrogen ion-selective sensor comprises an elongated, flexible tube having opposite open ends and being electrically insulating, a silver-silver halide reference electrode positioned at least partially within the tube, an electrical lead in electrical contact with the reference electrode, a gelled electrolyte solution containing at least one halide salt solution filling the tube and in contact with the silver halide coated portion of the reference electrode and with the opposite end of the tube, a metal tube with an exterior surface of palladium surrounding at least a portion of the first tube, an electrical lead in contact with the metal tube, palladium oxide adhering tightly to at least a portion of the exterior surface of palladium on the metal tube, and electrical insulation surrounding the remaining palladium surface on the metal tube and its associated electrical lead.
A hydrogen ion-selective sensor as in claim 1, wherein the reference electrode is a coating adhering firmly to the interior surface of the electrically insulating tube.
Claim 2
Dependent Claim
52 words
A hydrogen ion-selective sensor as in claim 1, wherein the reference electrode is a silver wire positioned partly within the tube at one end thereof and extending outwardly from the one end and a coating of a silver halide on a portion of the silver wire positioned within the electrically insulating tube.
Claim 3
Dependent Claim
27 words
A hydrogen ion-selective sensor as in claim 3, wherein the flexible tube is bonded to the silver wire at the said one end of said flexible tube.
Claim 4
Dependent Claim
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A hydrogen ion-selective sensor as in claim 1, wherein the halide salt solution is potassium chloride solution.
Claim 5
Dependent Claim
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A hydrogen ion-selective sensor as in claim 1, wherein the metal tube is a palladium metal tube.
Claim 6
Dependent Claim
18 words
A hydrogen ion-selective sensor as in claim 1, wherein the electrically insulating tube is a polymeric heat-shrinkable tubing.