Title:
グラジエント送液用ポンプシステム及び液体クロマトグラフ
Document Type and Number:
Japanese Patent JP3709409
Kind Code:
B2
Abstract:
A gradient liquid feed pump system capable of liquid feed in a correct mixing ratio even in the case of liquid feed in which the mixing ratio varies. Specifically, it comprises a first plunger pump for sucking and delivering an eluate, a second the first and second plunger pumps through a cam, a first pressure sensor for measuring the pressure in the flow path of the second plunger pump, a second pressure sensor for measuring the pressure in the fist plunger pump, a cam position detecting sensor for detecting the cam position, wherein when the cam position is in a delivery interval, the rotary speed of the motor is increased, and the period for decreasing the rotary speed is determined on the basis of the difference between the pressure values obtained from the first and second pressure sensors, respectively. Thereby, liquid feed can be smoothly effected with correct mixing ratio while avoiding pressure interference between pumps.
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Inventors:
Mori Holy Year
Kenichiro Takahashi
Takanori Masanori
Masato Fukuda
Masato Ito
Hironori Kaji
Kenichiro Takahashi
Takanori Masanori
Masato Fukuda
Masato Ito
Hironori Kaji
Application Number:
JP2003576955A
Publication Date:
October 26, 2005
Filing Date:
March 17, 2003
Export Citation:
Assignee:
Hitachi High-Technologies Corporation
Hitachi Science Systems Co., Ltd.
Hitachi Science Systems Co., Ltd.
International Classes:
F04B11/00; F04B13/02; G01N30/32; G01N30/34; (IPC1-7): G01N30/32
Domestic Patent References:
| JP61166176U | ||||
| JP7166176A | ||||
| JP2001254684A | ||||
| JP291485A | ||||
| JP6011690A | ||||
| JP63212778A | ||||
| JP6488361A |
Attorney, Agent or Firm:
Yasuo Sakuta