Oxygen analyzing method and device

Details Oxygen analyzing method and device Oxygen analyzing method and device

1987-04-06

1989-10-24

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204406, 204412, 204425, G01N 2758

Patent

active

048759813

ABSTRACT:
An oxygen analyzing method for determining a positive or negative oxygen concentration of a measurement gas which changes between oxidizing and reducing atmospheres. The method uses a sensing element having an oxygen sensing cell wherein an electromotive force is induced between its measuring and reference electrodes according to the principle of an oxygen concentration cell. The atmosphere adjacent to the measuring electrode is controlled by controlling a pumping current to be applied to an oxygen pumping cell such that the electromotive force induced in the sensing cell is maintained at a predetermined level. A heater is provided to heat the sensing and pumping cells, to maintain their operating temperature within a range of 700.degree.-960.degree. C. The pumping current, or a signal to control the pumping current, is converted into an oxygen concentration signal whose level is held within one of a positive range and a negative range. The concentration signal represents the positive oxygen concentration of the oxidizing atmosphere, or the negative oxygen concentration of the reducing atmosphere.

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patent: 4770758 (1988-09-01), Suzuki et al.
patent: 4776943 (1988-10-01), Kitahara

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