Gas sensor and method of using same

Details Gas sensor and method of using same Gas sensor and method of using same

1986-10-14

1988-03-08

Demers, Arthur P.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204400, 204402, 204406, 204407, 204412, 204431, 204433, 128635, G01N 2726

Patent

active

047298243

ABSTRACT:
An electrochemical sensor capable of determining the partial pressure of various gases (e.g., CO, CO.sub.2, H.sub.2 S, alcohol vapors, hydrocarbons, NO.sub.x, etc.) and, optionally, substantially concurrently, but independently, oxygen content in gases and liquids. The sensor measures the amount of chemisorbent species formed either electrochemically by partial reduction (such as "Reduced-CO.sub.2 " in the case of CO.sub.2) or partial oxidation (in the case of alcohol) or non-electrochemically via specific adsorption (in the case of CO and hydrocarbons) on platinum or other metals. The charge required to oxidize this chemisorbed species is proportional to the amount of adsorbate on the electrode surface which is made a reproducible and reliable function of the partial pressure of the gas to be measured. By the proper selection of the sensor construction and electrical parameters, high sensitivity, fast response time, and high selectivity can be obtained.

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patent: 4340458 (1982-07-01), Lerner et al.
Sawyer, D. T. et al, Experimental Electrochemistry for Chemists, John Wiley & Sons; N.Y., N.Y., (1974) pp. 269-273.

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