OXYGEN SENSOR AND ELECTRODE DEVICE THEREFOR
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Abstract
AN OXYGEN SENSOR IS DESCRIBED WHICH HAS AN ELECTRODE DEVICE WITH A FIRST ELECTRODE AND A REFERENCE ELECTRODE, AND AN AQUEOUS BUFFERED SOLUTION OF AN ELECTROLYTE CONTAINING A HALIDE SALT WHICH CONTACTS THE NOBLE METAL PORTION OF THE FIRST ELECTRODE AND THE SILVER HALIDE LAYER OF THE REFERENCE ELECTRODE OF THE ELECTRODE DEVICE. THE ELECTRODE DEVICE HAS A CHEMICALLY-BIASED OXYGENSENSING ELECTRODE WITH A CLOSED-END TUBE, THE TUBE HAVING A PORTION OF A NOBLE METAL SELECTED FROM THE CLASS CONSISTING OF PALLADIUM AND PALLADIUM ALLOYS, A RESERVOIR FOR HYDROGEN CONNECTED TO THE OPPOSITE END OF THE TUBE, AND A HYDROGEN GAS SOURCE CONTAINED WITHIN AT LEAST THE RESERVOIR; A LAYER OF ELECTRICAL INSULATION COVERING AT LEAST PARTIALLY THE TUBE LEAVING THE NOBLE METAL PORTION AT LEAST PARTIALLY EXPOSED, AND A REFERENCE ELECTRODE INSULATED ELECTRICALLY FROM THE NOBLE METAL PORTION, THE REFERENCE ELECTRODE CONSISTING OF SILVER WITH AT LEAST A PARTIAL LAYER OF SILVER HALIDE THEREON.
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