| 摘要 |
A liquid chromatograph comprising a reciprocating single plunger pump having a pair of check valves; a solvent supply passage, from the outlet check valve of the pump to a column; a driver means for the plunger of the pump; a control means for controlling the velocity of the plunger; the control means comprising a pressure detecting means disposed in the solvent supply passage, a memory means for storing a pressure signal obtained from the detecting means at a predetermined point between the initiation and termination of the suction, and a comparator means for comparing the stored pressure signal with a signal indicating a pressure which is derived from the pressure detecting means; the signal produced from the comparator means allowing the velocity at which the plunger is moved for delivery from the initiation of delivery stroke until the outlet pressure of the pump reaches the pressure at the predetermined point to be controlled so that it is greater than a velocity of the plunger set for the subsequent movement for delivery.
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