Apparatus for sensing low concentration NOx

Details Apparatus for sensing low concentration NOx Apparatus for sensing low concentration NOx

1998-03-31

2000-05-16

Williams, Hezron

Measuring and testing

Gas analysis

With compensation detail

436118, G01N 2704

Patent

active

060620641

ABSTRACT:
An apparatus for sensing low concentration NOx in the atmosphere is disclosed. The apparatus has sensor elements arranged in a flow path of the atmosphere, the resistance of each of said sensor elements varying in response to changes in NOx concentration of the atmosphere; a catalyst arranged between said sensor elements to maintain partial pressures of NO and NO.sub.2 in the atmosphere at an equilibrium state; and measuring means for receiving signals from said sensor elements, one sensor element being contacted with the atmosphere which is not passed through said catalyst and the other sensor element being contacted with the atmosphere which is passed through said catalyst and for determining the concentrations of NO.sub.2 and NO in the atmosphere on the basis of said signals.

REFERENCES:
patent: 3949599 (1976-04-01), Kruishoop
patent: 4315753 (1982-02-01), Bruckenstein et al.
patent: 5705129 (1998-01-01), Takahashi et al.

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