Patent ID: 9322742
Filing Date: 2016-04-26
CPC Classification: G01M,G01N

Claim Text:
1. A hydrogen flame ionization type exhaust gas analyzer adapted to measure a concentration of a measurement target substance contained in an exhaust gas based on ion current that is generated upon introduction of the exhaust gas into a hydrogen flame of the hydrogen flame ionization type exhaust gas analyzer, comprising: a collector electrode for capturing ions generated from the exhaust gas by the hydrogen flame; an acquisition circuit electrically connected to the collector electrode to acquire ion current caused by the ions captured by the collector electrode; and an abnormality determining part for determining an abnormality in the case where a difference between a first output value or a first relevant value obtained from the first output value, and a second output value or a second relevant value obtained from the second output value, is equal to or larger than a predetermined value, wherein the first output value is measured by the acquisition circuit while no ion current caused by the exhaust gas flows to the collector electrode and wherein the second output value is measured by the acquisition circuit while gas of a known concentration of a measurement target substance is introduced into the hydrogen flame.