Liquid chromatograph device
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.
Claims8
A liquid chromatogrpah device comprising:
- a first liquid feeding device for feeding a first solution,
- a second liquid feeding device for feeding a second solution, said first and second liquid feeding devices being connected to each other,
- a column which introduces said first and second solutions with sample and for separating a sample into its constituents, and
- a detector for analyzing the constituents,
- wherein said first and second solutions are fed through a discharge pipe to said column so that a mixing ratio between said first solution and said second solution is being changed in a stepwise manner as time passes by,
- said liquid chromatograph device further comprising a controller for giving a feed-back gain proportionate to a ratio between the two liquid feeding flow rates to a signal for controlling liquid feeding flow rates of said first and second liquid feeding devices.
A liquid chromatograph device comprising:
- a first liquid feeding device for feeding a first solution,
- a second liquid feeding device for feeding a second solution,
- a first discharging pipe which is connected to said first liquid feeding device and for discharging said first solution from said first liquid feeding device,
- a second discharging pipe which is connected to said second liquid feeding device and for discharging said second solution from said second liquid feeding device,
- a connection for connecting between said first and second discharging pipes,
- an injector for pouring sample to be analyzed into the solution from said connection and for mixing said sampling with said solution,
- a column for introducing said solution from said injector and for separating said sample into its constituents,
- a detector for detecting said constituents from said column, and a controller for keeping a total flow rate of said first solution and said second solution at constant and for giving a feed-back gain proportionate to a ratio between the two liquid feeding flow rates.
Dependencies are inferred from the claim text.