Agilent Technologies G4782A, Руководство пользователя

Страница: 43 / 202

1260 SFC Binary Pump 43
Using the Pump
3
Setting up the Pump with the Instrument Control Interface
Auxiliary Pump Parameters
The auxiliary pump parameters are pre-set to fit most applications.
Adjustments should only be made when required.
Table 4 on page 43 shows
the available auxiliary parameters with their default values.
Data Curves
The binary pump provides the possibility to store the following operational
data in the data file of the Agilent data system:
• Solvent percentage for each channel,
• pump flow,
• pressure
C A U T I O N
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 4 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.