Apparatus for detecting concentration of nitrogen oxide

Details Apparatus for detecting concentration of nitrogen oxide Apparatus for detecting concentration of nitrogen oxide

2002-12-27

2008-12-09

Olsen, Kaj K (Department: 1795)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S425000, C205S781000

Reexamination Certificate

active

07462266

ABSTRACT:
Apparatus for detecting the NOx concentration includes a first measurement chamber20communicating with the gas under measurement via a diffusion rate defining layer4dand a second measurement chamber26communicating with the first measurement chamber20via diffusion limiting layers6d, 22d. A first pump current IP1is controlled so that an output of a Vs cell6will be equal to the reference voltage VCO for controlling the oxygen concentration in the first measurement chamber20to a pre-set low value. A constant voltage is applied across the second pump cell8for decomposing the NOx component in the second measurement chamber26for pumping out oxygen for detecting the NOx concentration from a second pump current IP2. The sensor temperature is detected from the internal resistance of the Vs cell for controlling the current supplied to the heaters12, 14. If the temperature of the gas under measurement is changed rapidly, the sensor temperature is changed. The detected second pump current IP2is corrected depending on an offset of the detected sensor temperature from the target temperature assuring detection of the NOx concentration to high accuracy.

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