| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump for liquid chromatograph, enabling liquid feeding with a single pump for a wide range of flow. SOLUTION: The pump for liquid chromatograph has a first pump 100 and a second pump 200 for feeding eluent, and both the first and second pumps are combined so as to perform cooperative operation with the first pump on the upstream side and the second pump on the downstream side in the feeding direction of the eluent. A flow passage switching means 5 is provided, allowing one of a plurality of operation modes for different combinations of cooperative states of the two pumps to be selected by switching the passages of the eluent by this flow passage switching means. According to this selection of the operation modes, switching is made to one of a plurality of liquid feeding amount modes with different ranges of the amount of liquid feeding, thereby carrying out the liquid feeding. COPYRIGHT: (C)2006,JPO&NCIPI
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