Combustibles sensor

Details Combustibles sensor Combustibles sensor

1985-07-11

1987-05-05

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204424, 204427, G01N 2746

Patent

active

046630171

ABSTRACT:
A modified zirconia oxygen sensor is disclosed wherein gas flows through inner (14) and outer tubes (12) and wherein one electrode (18) is attached to the inner surface of the inner tube (14), and the second electrode (16) is attached to the outer surface of the inner tube (14). The outer catalytic surface of inner tube (14) is made inert so that an oxygen potential difference is produced between the electrodes (16, 18) which results in a voltage output, as read by the oxygen analyzer (42), which is proportional to the initial level of the combustible in the gas. The utilization of inner (14) and outer tubes (12) wherein the portion of the gas sample contacting the active electrode (18) is maintained separate from the portion of the gas sample contacting the inactive electrode (16) prevents back or edge diffusion between the electrodes.

REFERENCES:
patent: B843038 (1976-02-01), Sandler
patent: 3869370 (1975-03-01), Sayles
patent: 3960500 (1976-06-01), Ross et al.
patent: 4154664 (1979-05-01), Renevot
patent: 4240890 (1980-12-01), Watanabe et al.
patent: 4430192 (1984-02-01), Maeda
Webster's New Collegiate Dictionary, 1960, p. 945.

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