| 摘要 |
<p>A plunger pump according to the present invention includes: a pulse motor for driving a plunger of the plunger pump; a position sensor for detecting the position of the plunger and for generating a position signal corresponding to the position detected; and a reference position detector for detecting the reference position of the pulse motor at which the plunger is at the dead center (the outermost dead center or the innermost dead center) based on a plurality of the position signals from the position sensor. While, in the adjusting operation, the plunger of the plunger pump is moved by the pulse motor, the position sensor sends a series of position signals to the reference position detector. Based on the position signals, especially those around a turning point of the movement of the plunger, the reference position detector detects the exact position of the dead center of the plunger pump, and determines it as the reference position of the pulse motor. In a subsequent HPLC analysis using the plunger pump, the rotational position and speed of the pulse motor are controlled based on the reference position thus determined. The reference position may be further used in various aspects of analysis: in a low pressure gradient elusion, for example, the valves are controlled according to the timing based on the reference position of the pulse motor. <IMAGE></p> |
