The gradient delay volume of an HPLC system is defined as the volume of the entire flow path between the point where the gradient is formed and the point where the mobile phase enters the column (see Gradient Delay Volume, Dwell Volume and Ripple).

The pump contributes to the system gradient delay volume by the dwell volume, which is the calculated volume between the point where the gradient is formed and the pump outlet.

Dwell volume of the pump
Figure: Dwell volume of the pump

No.

Description

A-D

Solvent options:

  • 4 solvents available with the quaternary pump (solvents A-D)

  • 3 solvents available with the dual pump (solvents A-C), with each of the two pumps

1

Solvent degasser (vacuum degasser)

2

Proportioning valve

3

Pump head

4

Purge/sensor unit

5

Mixing system with capillary mixer and static mixer

6

Pump outlet

7

Dwell volume of the pump

For the dwell volume of the pump, see Performance Specifications.