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Liquid chromatograph

  • US 6,129,840 A
  • Filed: 06/17/1999
  • Issued: 10/10/2000
  • Est. Priority Date: 06/19/1998
  • Status: Expired due to Term
First Claim
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1. A liquid chromatograph comprising a column separating a sample, a feed part feeding a mobile phase to said column, a sample introduction part collecting said sample from a sampling needle into a sampling loop and introducing said collected sample into a mobile phase channel upstream said column by switching a channel switching valve, a detection part detecting said sample separated in said column and a control part controlling the operations of said feed part and said sample introduction part, said liquid chromatograph further comprising:

  • a drain port discharging a liquid discharged from said sampling needle outward, whereinsaid control part switches said channel switching valve for connecting said feed part to a channel connecting said sampling needle through said sampling loop, locates said sampling needle on said drain port, and controls an operation switching said feed part to high-speed driving in addition to said control.

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