1260 Infinity Binary Pump User Manual 87
Optimizing Performance
5
How to Optimize the Compressibility Compensation Setting
How to Optimize the Compressibility Compensation Setting
When a solvent is metered at ambient pressure and compressed to a
higher pressure, the volume decreases depending on its compressibility.
Solvent compressibility is a non- linear function of pressure and
temperature. It is specific for each solvent.
In order to deliver the desired flow accurately at all pressures, Agilent
pumps use a compressibility compensation. For standard LC applications,
e.g. using a 400 bar binary pump, an average compressibility value for the
solvent is sufficient.
For the 600 bar 1260 Infinity Binary Pump , the pressure- dependency of a
solvent compressibility needs to be considered. It is determined at
different pressures between 0 – 600 bar. The pump uses the obtained
non- linear function to select the correct compressibility value for the
actual pump pressure. Compressibility data for the most common solvents
is readily available in the pump firmware.
The compensation algorithm is so powerful that the damper and mixer can
be removed from the pump flow path at low flow rate while the pressure
ripple and composition ripple remain at low levels.
For method compatibility reasons, the legacy compressibility compensation
is still available.
Solvent Compressibility Calibration
Unlisted or premixed solvents can be calibrated with the Solvent
Compressibility Calibration function. For a detailed description, see
“Binary Pump Solvent Compressibility Calibration” on page 133.
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