Gas analyzing apparatus

A gas analyzing system, comprising:

• a gas analyzing apparatus including a separator such as a gas chromatograph or the like for separating gas components, and an analyzer such as an atmospheric pressure ionization mass spectrometer or the like for analyzing gas components;
• a sample gas source for supplying a sample gas;
• and a carrier gas source for supplying a carrier gas into said separator, said gas analyzing apparatus further comprising:
• an analyzer introduction passage for directly introducing a sample gas supplied from the sample gas source into the analyzer to which a sample gas passage connected to said sample gas source and an analyzer inlet passage connected to said analyzer are connected via an analyzer introduction valve;
• a separator introduction passage to which said sample gas passage and a separator inlet passage are connected via a separator introduction valve;
• a separator flowing-out passage to which a separator outlet passage and said analyzer inlet passage ax-c connected via a separator flowing-out valve;
• a purge valve for blocking or passing said carrier gas supplied from said carrier gas source;
• and
• a purge passage to which said separator outlet passage and said separator inlet passage are connected via said purge valve;
• wherein when said sample gas from said sample gas source is directly introduced into said analyzer, said analyzer introduction valve and said purge valve are open while said separator introduction valve and said separator flowing-out valve are closed, whereby said sample gas from said sample gas source is directly introduced into said analyzer via said analyzer introduction passage while a carrier gas supplied from said carrier gas source into said separator and flowing out from said separator outlet passage is introduced into said separator inlet passage via said purge passage, and when said sample gas from said, sample gas source is introduced into said analyzer after said sample gas is separated in said separator, said analyzer introduction valve and said purge valve are closed while said separator introduction valve and said separator flowing-out valve are open, whereby said sample gas from said sample gas source is introduced into said separator through said separator introduction passage to be separated in said separator and then is accompanied by said carrier gas to flow out from said separator outlet passage and then introduced into said analyzer inlet passage through said separator flowing-out passage.