| 摘要 |
PROBLEM TO BE SOLVED: To send a liquid in a flow rate ranging from an extremely low flow rate of a nanoliter/min level to a low flow rate of a microliter/min level with good reliability by one pump system. SOLUTION: This liquid sending system has two stages of pump units 100 and 200 for sending an elute under pressure and the flow channel switching means 5 connected to these pump units by pipelines. The switching speed of the flow channel switching means is changed corresponding to a liquid sending flow rate by a controller 50. COPYRIGHT: (C)2007,JPO&INPIT
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