The compressibility of the solvents in use will affect retention-time stability when the backpressure in the system changes (for example, aging of column). To minimize this effect, the pump provides a compressibility compensation feature, which optimizes the flow stability according to the solvent type. The compressibility compensation is set to a default value and can be changed through the user interface.
Without a compressibility compensation, the following will happen during a stroke of the first piston. The pressure in the piston chamber increases and the volume in the chamber will be compressed depending on backpressure and solvent type. The volume displaced into the system will be reduced by the compressed volume.
With a compressibility value set, the processor calculates a compensation volume that depends on the backpressure of the system and the selected compressibility. This compensation volume will be added to the normal stroke volume and compensates the previously described loss of volume during the delivery stroke of the first piston.
base-id: 3860720395
id: 3860720395