Microprocessor controlled systems are capable of accurately delivering a mobile phase of either constant (isocratic elution) or varying composition (gradient elution) according to a defined programme.

• 微处理器控制系统可以根据确定的程序准确地传输恒定的移动相（恒溶剂洗脱法）或变化组分的移动相（梯度洗脱法）。