Ngk Insulators, Inc.

Yoshinobu Nakada

Taku Okamoto

Kosuke Monna

A apparatusfor measuring ammonia concentration includes an electromotive force acquisition sectionconfigured to acquire information about an electromotive force EMF of a mixed potential cellwhile a detection electrodeis exposed to a target gas, an oxygen concentration acquisition sectionconfigured to acquire information about oxygen concentration pin the target gas, and a control section. The control sectionderives ammonia concentration pin the target gas from the acquired information about the electromotive force EMF, the acquired information about the oxygen concentration p, and the relationship represented by formula (1):EMF=&#x3b1; log()&#x2212;&#x3b2; log()+&#x2003;&#x2003;(1)where &#x3b1;, &#x3b2;, and B each represent a constant, and a and b each represent any base (provided that a&#x2260;1, a&#x3e;0, b&#x2260;1, and b&#x3e;0).

Apparatus for measuring ammonia concentration, system for measuring ammonia concentration, system for treating exhaust gas, and method for measuring ammonia concentration

A apparatusfor measuring combustible-gas concentration includes an electromotive force acquisition sectionconfigured to acquire information about an electromotive force of a mixed potential cellwhile a detection electrodeis exposed to a target gas, an oxygen concentration acquisition sectionconfigured to acquire information about oxygen concentration pin the target gas, and a control section. The control sectionderives combustible-gas concentration pin the target gas from the acquired information about the electromotive force EMF, the acquired information about the oxygen concentration p, and the relationship represented by formula (1):EMF=&#x3b1; log()&#x2212;&#x3b2; log()+&#x2003;&#x2003;(1)where &#x3b1;, &#x3b2;, and B each represent a constant, and a and b each represent any base (provided that a&#x2260;1, a&#x3e;0, b&#x2260;1, and b&#x3e;0).

Apparatus for measuring combustible-gas concentration, system for measuring combustible-gas concentration, system for treating exhaust gas, method for measuring combustible-gas concentration, and method for deriving constant

An apparatus for measuring ammonia concentration measures ammonia concentration in a target gas with a sensor element including a mixed potential cell. The apparatus for measuring ammonia concentration includes an electromotive force acquisition section, an oxygen concentration acquisition section, and an ammonia concentration derivation section. The ammonia concentration derivation section derives the ammonia concentration in the target gas from the relationship represented by formula (1):EMF=&#x3b1; log()&#x2212;&#x3b2; log()+&#x3b3; log()&#xd7;log()+B&#x2003;&#x2003; (1)

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Nagoya, Japan

Yoshinobu Nakada