System, apparatus, and method for measuring an oxygen...

Measuring and testing – Gas analysis – Gas of combustion

Reexamination Certificate

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C073S031050

Reexamination Certificate

active

11244210

ABSTRACT:
An apparatus, system and method maximizes efficiency and accuracy of measuring an oxygen concentration of a measured gas by varying a flow of oxygen ions within a measuring cell (202) in accordance with an output signal of an oxygen sensor cell (206). The pump current (208) through a pump cell (204) is switched between a constant positive current and a constant negative current when upper and lower thresholds of the output signal are reached. The pulse width ratio of the square wave produced by the varying current is compared to a pulse width ratio function derived from a calibration procedure to determine the oxygen concentration of the measured gas.

REFERENCES:
patent: 4721088 (1988-01-01), Mieno et al.
patent: 6192874 (2001-02-01), Dekoninck et al.

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