| 摘要 |
PROBLEM TO BE SOLVED: To make precisely and simply measurable a very small flow rate, especially a flow rate at mL/min toμL/min or less and to make precisely and continuously distributable and fractionatable a fluid in a very small flow rate. SOLUTION: A very-small-flow-rate pump 1 is installed freely at the end of a route 9. A sample injector 3 and a calibration pipe 5 are connected to the route 9. An air-bubble detection part 4 and an air-bubble detection part 6 are installed at the both ends of the calibration tube 5. A carrier is sent from the pump 1. While the carrier is being sent, air bubbles are injected from the sample injector 3. The flow of the air bubbles is detected in the two air- bubble detection parts 4, 6, its elapsed time is measured, an internal volume of the calibration pipe 5 is divided by the elapsed time so as to be calculated by a computer 7, and the flow rate is obtained. COPYRIGHT: (C)2003,JPO
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