Electrochemical multigas sensor

Details Electrochemical multigas sensor Electrochemical multigas sensor

1997-12-09

1999-08-03

Bell, Bruce F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204431, 204432, 205783, 2057855, 205786, 2057865, 205793, 2057945, G01N 2726

Patent

active

059320796

ABSTRACT:
An electrochemical measuring cell for the simultaneous detection of different gas components in a gas sample, with a plurality of measuring electrodes (4, 5, 6) behind a diffusion barrier (7), with a common reference electrode (8) and counterelectrode (9) in an acid electrolyte, and with a potentiostatic evaluating circuit. Improvements in terms of service life for a sensor for the simultaneous detection of oxygen and carbon monoxide is provided with a reference electrode formed of a sintered mixture of metal and its metal oxide, preferably from the platinum group, the iridium group or gold and the potential of the CO-measuring electrode (5) relative to the reference electrode (8) is set at about 0 to 300 mV, and that of the O.sub.2 -measuring electrode (4) is set at a value between -300 and -800 mV.

REFERENCES:
patent: 5298146 (1994-03-01), Braden et al.
patent: 5723036 (1998-03-01), Chrzan et al.

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