NOx concentration measuring apparatus

Details NOx concentration measuring apparatus NOx concentration measuring apparatus

1990-05-15

1991-01-29

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

123489, 20415314, 204410, G01N 27407

Patent

active

049884280

ABSTRACT:
An NOx concentration measuring apparatus employing first and second wide-range air/fuel ratio sensors for measuring an NOx concentration of gases introduced thereto through a first passage. First and second restricted orifices are provided in the first passage upstream of the first and second sensors. A second passage is connected to the first passage between the first and second orifices. A suction pump is connected to the first passage downstream of the first and second sensors for producing a suction vacuum in the first passage and is also connected to the second passage for producing a suction vacuum in the second passage. The first and second orifices are effective to prevent momentary gas pressure fluctuations from affecting the accuracy of measurement of the first and second sensors.

REFERENCES:
patent: 4115235 (1978-09-01), Capone
patent: 4927517 (1990-05-01), Mizutani et al.

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