Agilent InfinityLab LC Series 1260 Infinity II Isocratic- and Quaternary Pumps User Manual 69
Using the Pump
3
Setting up the Pump with the Instrument Control Interface
Advanced Settings
The pump advanced method setup parameters are in four sections:
• Minimum Stroke
• Compressibility
• Maximum Flow Gradient
• Primary Channel (Quaternary Pump only)
Table 1 3 Advanced method parameters
Parameter Limits Description
Minimum Stroke 20 – 100 µL The Stroke Volume is used for optimizing between performance of the
module and seal life time. For performance a low stroke volume is
beneficial, as it divides disturbances into smaller packages, but a larger
volume is extending the life time of the pump seals.
If Automatic is activated, the pump tries to achieve an optimized stroke
volume for best performance and lowest ripple.
Compressibility
40·10
-6
– 150·10
-6
.
Default
compressibility value:
100·10
-6
The compressibility of the mobile phase has an effect on the performance
of the pump. For best flow accuracy and mixing performance, you can set
the parameter according to the mobile phase being used.
Maximum Flow
Gradient
0.1 –
100 mL/min/min
Default value:
100 mL/min/min
You can set a limit on the rate of change of the solvent flow to protect
your analytical column.
Primary Channel
(Quaternary pump
only)
Using Automatic is recommended.
The primary channel can be specified as A to D for optimizing highly
specific methods. It is split up to deliver the first and last solvent package
created by the MCGV in order to optimize composition precision. The
primary channel does not change during a gradient, as long as the
channel is used. Using Automatic chooses the channel with the highest
percentage at start conditions before a gradient.
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