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

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

2005-12-27

2005-12-27

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Gas analysis

Gas of combustion

C073S031050

Reexamination Certificate

active

06978655

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: 6192874 (2001-02-01), Dekoninck et al.
patent: 6301951 (2001-10-01), Lenfers et al.
patent: 19636226 (1998-03-01), None
patent: 19800027 (1999-07-01), None
patent: 0924514 (1999-06-01), None
patent: 61118653 (1986-06-01), None
patent: 63075553 (1988-04-01), None

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