| 摘要 |
PURPOSE:To achieve a smooth feeding of a liquid by mixing specified eluants in the chamber of a pump with at least two check valves provided on the suction side in a liquid chromatograph provided with a liquid feeding section, a sample injecting section, a separation section and a detector section. CONSTITUTION:In a liquid chromatograph comprising a liquid feeding section 14, a sample injecting section 15, a separation section 16 and a detector section 17, solenoid valves 10a and 10b are connected to eluant storages 9a and 9b for holding specified eluants A and B at a liquid feeding section 14. Solenoid valves 10a and 10b are connected to a pump 11 through suction side check valves 1a and 1b to mix the eluants A and B in the pump chamber 5. This generates bubbles in the pump chamber 5 and prevents malfunctioning of check valves 1a and 1b. The mixing ratio of the eluants A and B is made variable by controlling the opening or closing time with a controller 12 through alternate opening and closing of the solenoid valves 10a and 10b. Discharge pressure through a discharge side check valve 4 is detected with a pressure sensor 13 to control a cam 2 thereby enabling a smooth discharge of the mixed eluants. |
