Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1979-12-06
1982-12-21
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2728, G01N 2754
Patent
active
043648100
ABSTRACT:
There is disclosed an electrochemical gas detector system utilizing a polarized gas diffusion sensing electrode which is exposed to a gas mixture containing an electrochemically oxidizable or reducible gas, such as CO, H.sub.2, H.sub.2 S, SO.sub.2, NO, NO.sub.2 and CH.sub.4 which electrode has a suitable catalyst, such as platinum, iridium, ruthenium, gold, etc., as the active element at which the gas is electrochemically oxidized or reduced, a non-polarizable, reversible counter electrode constituted by a suitable redox couple, preferably of the type metal/metal salt, such as Ag/AgCl or metal/metal oxide, such as Hg/HgO, or metal oxide/metal salt, such as PbO.sub.2 /PbSO.sub.4, and a liquid electrolyte body in contact with both electrodes to constitute a complete electrochemical cell. A constant potential difference is applied between the electrodes which biases the sensing electrode to a selected portion of the electrochemical current-voltage curve for oxidation or reduction of the reducible gas. Means are provided for indicating current flowing between the electrodes as a measure of the concentration of the gas at the sensing electrode.
REFERENCES:
patent: 3776832 (1973-12-01), Oswin et al.
patent: 4017373 (1977-04-01), Shaw et al.
patent: 4025412 (1977-05-01), La Conti
La Conti et al., "J. Electrochem. Soc.", Mar. 1971, vol. 118, pp. 506-510.
Kaplan G. L.
Rexnord, Incorporated
Zegeer Jim
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