초록 ▼

The disclosed apparatus for sensing low concentration NOx in a measurement gas especially in the atmosphere has at least a sensor element made of an oxide arranged in a flow path of the measurement gas, the resistance of the sensor element varying in response to changes in NOx concentration in the m

The disclosed apparatus for sensing low concentration NOx in a measurement gas especially in the atmosphere has at least a sensor element made of an oxide arranged in a flow path of the measurement gas, the resistance of the sensor element varying in response to changes in NOx concentration in the measurement gas. As suitable options of this type of the NOx sensor, there are disclosed a chamber used for an apparatus for sensing low concentration NOx, a gas sensor element and a method of manufacturing the gas sensor element, and an ammonia removing apparatus and an NOx sensor utilizing the ammonia removing apparatus.

대표청구항 ▼

[ What is claimed is:] [1.] A chamber used for an apparatus for sensing low concentration NOx in a measurement gas having, a catalyst arranged to maintain partial pressures of NO and NO.sub.2 in the measurement gas at an equilibrium state, and first and second sensor elements arranged in a flow path

[ What is claimed is:] [1.] A chamber used for an apparatus for sensing low concentration NOx in a measurement gas having, a catalyst arranged to maintain partial pressures of NO and NO.sub.2 in the measurement gas at an equilibrium state, and first and second sensor elements arranged in a flow path of the measurement gas, the resistance of each of said first and second sensor elements varying in response to changes in NOx concentration of the measurement gas, said first sensor element being contacted with the measurement gas which is not contacted with said catalyst and said second sensor element being contacted with the measurement gas which is contacted with said catalyst, comprising:a chamber main body having a gas inlet and a gas outlet of the measurement gas;a first sensor element securing portion for securing said first sensor element, arranged in said chamber main body;a catalyst accommodating portion for accommodating said catalyst, arranged in said chamber main body;a second sensor element securing portion for securing said second sensor element, arranged in said chamber main body; andfirst, second, third and fourth through holes arranged in said chamber main body in such a manner that said first through hole communicates said gas inlet and said first sensor element securing portion, said second through hole communicates said first sensor element securing portion and said catalyst accommodating portion, said third through hole communicates said catalyst accommodating portion and said second sensor element securing portion, and said fourth through hole communicates said second sensor element securing portion and said gas outlet.