Gas sensor and method

Details Gas sensor and method Gas sensor and method

1994-06-23

1995-04-11

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204401, 204406, 204431, 204432, 204412, 324555, 324693, 324713, 324718, 340635, G01N 2726, H01H 3102, G08B 2100

Patent

active

054055121

ABSTRACT:
A system and method of detecting the end of useful life in a gas sensor cell having a cathode, anode, one of which is consumable, and an electrolyte, and a circuit for controlling the flow of gas to the cell and a sensing resistor and circuit connected to said cathode and said anode, the consumable electrode is provided in the form of a plurality of discrete elements which are sequentially connected in circuit with the other electrode, sensing resistor and circuit. A drop in current between respective ones of the consumable electrode is an indication of the approach of the end of the useful life of the gas sensor.

REFERENCES:
patent: 3849725 (1974-11-01), Mori
patent: 4260985 (1981-04-01), Hayden
patent: 4845435 (1989-07-01), Bohan, Jr.
patent: 5273640 (1993-12-01), Kusanagi et al.

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