Liquid feeding system
AssigneeHitachi High-Technologies Corporation
InventorsKunihiko Takao, Hironori Kaji, Masahito Ito
Life of this patent
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Abstract
This liquid feeding system has the first and second pumps each of which is provided with a plunger. Liquid sucked through each of the pump suction ports is discharged out of the discharging port through the first pump and/or second pump. Under the starting operation mode, the second pump is stopped and only the first pump is operated. When the discharging pressure at the discharging port reaches up to a predetermined value, the starting operation mode is changed over to the normal operation mode. Under the normal operation mode, the first pump is stopped and only the second pump is operated.
Claims18
A liquid chromatograph device comprising:
- a suction pipe for sucking solution;
- a discharge pipe for discharging said solution;
- a column into which said solution containing sample is fed and for separating the constituents contained in the sample;
- a detector for analyzing each of the separated constituents;
- a first pump and a second pump disposed between said suction pipe and said discharging pipe, each pump being operated by a motor;
- and
- a pressure sensor for detecting the discharging pressure of said solution fed to said discharging pipe,
- wherein after said first pump is started and said discharging pressure reaches a target pressure, said second pump is started so that the constituents contained in the sample separated by said column are analyzed by said detector.
A method for operating liquid chromatograph device having a suction pipe for sucking solution, a discharging pipe for discharging said solution, a column into which said solution containing sample is fed and for separating the constituents contained in the sample and a detector for analyzing each of the separated constituents, a first pump and a second pump disposed between said suction pipe and said discharging pipe, each pump being operated by a motor, and
- a pressure sensor for detecting the discharging pressure of said solution fed to said discharging pipe, the method comprising the steps of:
- starting said first pump;
- detecting said target pressure with said pressure sensor;
- starting said second pump when said discharging pressure reaches a target pressure;
- separating the constituents contained in the sample said column;
- and
- analyzing the constituents by said detector.
Dependencies are inferred from the claim text.