| 摘要 |
Provided are a low pressure gradient liquid delivery device and liquid chromatography device that are accurate and highly precise regardless of the variety, temperature, mixing ratio or liquid delivery pressure of the eluent. The devices comprise: pump units, which have a cylinder with an eluent intake port and discharge port and a plunger that moves in a reciprocating manner inside the cylinder and which draw in and discharge the eluent; a valve means for switching between multiple kinds of eluents that are drawn up by the pump units using opening and closing actions; a pressure sensor for detecting the pressure of the eluent discharged from the discharge port of the pump units; and a control unit for controlling the opening and closing actions of the valve means. When said multiple eluents are drawn up, the control unit determines the pressure reduction interval from the discharge pressure when the plungers begin the intake action until the eluent starts to be drawn up and, after the pressure reduction interval, the actual intake interval during which the eluent is actually drawn up, and performs control so that the opening and closing actions of the valve means are performed within the determined actual intake interval. |
