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.
This check box allows you to use methods that have been developed for the G1311A/B/C quaternary pumps with the G4204A, G7104A/C or G7131A/C quaternary pumps without loss of performance. Clear this check box to display the compressibility fields, which allow you to enter compressibility values. When the check box is selected, the compressibility fields are not displayed, and the enhanced compressibility calibration is enabled. Select the required calibrated solvents from the drop-down lists using the combo boxes in the Solvents section.