Auxiliary Pump Parameters

The auxiliary pump parameters are pre-set to fit most applications. Adjustments should only be made when required. Auxiliary pump parameters shows the available auxiliary parameters with their default values.

CAUTION

Upon initialization, the pump ignores the Maximum Flow Gradient value.

This can result in a rapid and uncontrolled pressure increase.

To prevent harm to the column, open the purge valve until the initialization is finished.

**Table:** Auxiliary pump parameters
Parameter	Limits	Description
Maximum Flow Gradient	0.1 – 100 mL/min² default: 100 mL/min²	With this parameter flow rate changes can be ramped up and down slowly to avoid pressure shocks to the column. The default value is 100 mL/min² which in fact turns the function off.
Minimum Stroke	20 – 100 µL default: Auto	The volume one pump piston delivers per stroke. In general, a smaller stroke volume results in lower pump ripple. The Auto setting adjusts the strokes dynamically to the lowest possible value. The strokes can be set individually for pump heads A and B.
Compressibility	0 - 150·10^-6 /bar or enhanced compressibility calibration default: use enhanced comp. calibration	For best performance, check option Use enhanced compressibility calibration. With this option, the pump will use solvent data libraries provided by Agilent or data generated by using solvent compressibility calibrations. For backward compatibility to 400 bar pumps, the solvent compressibility can still be set manually for each channel when the box is unticked.
Maximum Flow Gradient	0.1 – 100 mL/min² default: 100 mL/min²	With this parameter flow rate changes can be ramped up and down slowly to avoid pressure shocks to the column. The default value is 100 mL/min² which in fact turns the function off.
Minimum Stroke	20 – 100 µL default: Auto	The volume one pump piston delivers per stroke. In general, a smaller stroke volume results in lower pump ripple. The Auto setting adjusts the strokes dynamically to the lowest possible value. The strokes can be set individually for pump heads A and B.
Compressibility	0 - 150·10^-6 /bar or enhanced compressibility calibration default: use enhanced comp. calibration	For best performance, check option Use enhanced compressibility calibration. With this option, the pump will use solvent data libraries provided by Agilent or data generated by using solvent compressibility calibrations. For backward compatibility to 400 bar pumps, the solvent compressibility can still be set manually for each channel when the box is unticked.

21-Jun-2025