Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-07-13
1996-05-21
Bell, Bruce F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204412, 204431, 204432, G01N 2726
Patent
active
055186025
ABSTRACT:
An amperometric sensor detects acidic and alkaline gases utilizing a first pH-dependent reversible redox system on a measuring electrode 4. A reduction current occurs between the measuring electrode 4 and a counter electrode 6 for a constant potential and is used as a measurement variable of the concentration of the gas to be detected. In addition, a reference electrode 5 is disposed in an electrolyte 7 together with the measuring electrode 4 and the counter electrode 6. The gas to be detected penetrates through the permeable membrane 2 and is dissolved while being dissociated. The amperometric sensor is improved with respect to its permanent stability. This is provided in that the first pH-dependent redox system is coupled to a second redox system and the redox potential of the second redox system is so selected that the reaction product is chemically regenerated again to the educt via the second redox system. The reaction product is electrochemically formed at constant potential by the first redox system.
REFERENCES:
patent: 4552624 (1985-11-01), Clarkson
"Amperometric acidic gas sensors using platinum oxide reduction and iodine reduction" by T. Ishiji, Sensors and Actuators B, vol. 13-14, (1993) pp. 583 and 584.
Bell Bruce F.
Dragerwerk Aktiengesellschaft
Ottesen Walter
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