Patent ID: 8486238

Claim:
A hydrogen ion electrode comprising: a metal wire; and a hydrogen ion sensor connected to the metal wire, wherein: the hydrogen ion sensor has a shape of a pellet which has such a length to allow the hydrogen ion sensor to be renewed by grinding a surface of the hydrogen ion sensor, the hydrogen ion sensor having a first end connected to the metal wire and a second end exposed to an exterior, the hydrogen ion sensor extending in a lengthwise direction from the first end to the second end; and the hydrogen ion sensor is formed of a sintered mixture of iridium oxide and glass or a sintered mixture of iridium oxide and ceramic material, wherein the hydrogen ion sensor is formed by the steps, including: a step of dispersing sinterable glass fine powder, ceramic powder or ceramic precursor powder in a solution containing iridium compound, evaporating and drying a solvent from the solution, thus applying the iridium compound on the surface of glass fine powder, ceramic powder or ceramic precursor powder, and then pyrolyzing compounds applied at below sintering temperature, thereby forming a sinterable mixture of iridium oxide and glass fine powder or a sinterable mixture of iridium oxide and ceramic material; and a further step of sintering the sinterable mixture into a hydrogen ion sensor pellet, thereby forming the sintered mixture of iridium oxide and glass or the sintered mixture of iridium oxide and ceramic material, wherein the hydrogen ion sensor further includes inactive conductive material, and the hydrogen ion sensor is formed of a sintered mixture of inactive conductive material, iridium oxide and glass, wherein: the inactive conductive material is coated on a surface of sinterable glass; then the sinterable glass coated with the inactive conductive material, is dispersed in the solution which contains iridium compound, a solvent is evaporated and dried from the solution, the iridium compound is applied on the surface of the glass, and then the compounds applied are pyrolyzed at below the sintering temperature, thereby forming a sinterable mixture of inactive conductive material, iridium oxide and glass; and then the sinterable mixture of inactive conductive material, iridium oxide and glass, is sintered into a hydrogen ion sensor pellet, thereby forming the sintered mixture of inactive conductive material, iridium oxide and glass.