Carbon monoxide sensor having mercury doped electrodes
AssigneeEndress + Hauser Conducta Gesellschaft fuer Mess--und Regeltechnik mbH + Co.
InventorWilfried Bytyn
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Abstract
In this carbon monoxide sensor, particularly for measuring carbon monoxide in flue gases, which must be operated in a controlled-potential bias circuit and which comprises a working electrode, a counter electrode, and a reference electrode, all of platinum black, as well as an electrolyte connected with these three electrodes, the hydrogen cross-sensitivity is drastically reduced by providing two layers enriched by mercury and/or mercury ions, one on a surface of the working electrode and one of a surface of the reference electrode. These two electrodes are treated with mercury or a mercury compound before or after incorporation into the sensor.
Claims6
A carbon monoxide sensor, for measuring carbon monoxide in flue gases, the carbon monoxide sensor comprising:
- a working electrode of platinum black;
- a counter electrode of platinum black;
- a reference electrode of platinum black;
- each of the working electrode, and reference electrode including a carbon monoxide contacting surface;
- an electrolyte connected with the working electrode, the counter electrode and the reference electrode;
- and
- two layers enriched by mercury and/or mercury ions, one on the carbon monoxide contacting surface of the working electrode and one on the carbon monoxide contacting surface of the reference electrode.
A method of manufacturing a carbon monoxide sensor, for measuring carbon monoxide in flue gases, the carbon monoxide sensor comprising
- a working electrode of platinum black;
- a counter electrode of platinum black;
- a reference electrode of platinum black;
- each of the working electrode, counter electrode and reference electrode including a carbon monoxide contacting surface, and
- an electrolyte connected with the working electrode, the counter electrode, and the reference electrode;
- said method comprising the step of treating the carbon monoxide contacting surfaces of the working electrode and the reference electrode with mercury or a mercury compound.
Dependencies are inferred from the claim text.