NOx measurement apparatus

Details NOx measurement apparatus NOx measurement apparatus

2007-08-07

2007-08-07

Olsen, Kaj K. (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C205S781000, C073S023310

Reexamination Certificate

active

10607191

ABSTRACT:
NOx sensor element of oxygen-ion conductive solid electrolyte body15; flow passage (7, 5, 8, 6) provided within the body for introducing analyte gas; oxygen partial pressure detection cell3; first oxygen pump cell1for controlling oxygen partial pressure of the gas in the flow passage; and nitrogen oxides detection cell2for decomposing nitrogen oxides in the gas having a controlled oxygen partial pressure and for causing dissociated oxygen to migrate through the solid electrolyte body (see FIG.1). Operational amplifier22bis connected between the nitrogen oxides detection cell2and a 12 V battery power source to generate a voltage applied to the nitrogen oxides detection cell2; and diode22dconnected to a point between the operational amplifier22band the nitrogen oxides detection cell. The diode clamps the voltage to an activation voltage higher than the measurement voltage during activation.

REFERENCES:
patent: 5340462 (1994-08-01), Suzuki
patent: 5980710 (1999-11-01), Kurokawa et al.
patent: 0937979 (1999-08-01), None
patent: 2001-141696 (2001-05-01), None

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