Patent ID: 6338823
Filing Date: 2002-01-15
Classification: G01N

Abstract:
A gas chromatograph for analyzing elements in a sample by introducing said sample into and separating the elements through a column, comprising:a chromatograph column with a sample introduction part; pressure measuring means for measuring a pressure in said sample introduction part; flow control means, placed in a flow path supplying carrier gas into said sample introduction part, for controlling a flow rate of said carrier gas; flow measuring means, placed in said flow path, for measuring said flow rate of said carrier gas; a split flow path, connected to said sample introduction part, exhausting part of said carrier gas and sample from said sample introduction part; a filter, placed in said split flow path, protecting said split flow path from becoming clogged; an exhaust valve, having an opening placed in said split flow path downstream of said filter, adjusting a flow rate in said split flow path; a controller calculating a flow path resistance of said filter based on a flow path resistance of said column, a pressure measured by said pressure measuring means when said exhaust valve is in an opened position, and a flow rate measured by said flow measuring means when said exhaust valve open, said controller controlling a monitor screen to display information based on said filter resistance by which the necessity to exchange said filter can be determined; and the monitor screen connected to said controller displaying information related to said filter.