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Gas chromatograph

  • US 6,338,823 B1
  • Filed: 04/15/1999
  • Issued: 01/15/2002
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Fees
First Claim
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1. 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.

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