No. | Description |
---|---|
1 | Solvent lines: A and B |
2 | Flow-controlled pump with two identical pump blocks (solvent channels), A and B |
2a | Pump blocks A and B, each pump block with: |
2b | Working cylinder |
2c | Working pressure sensor |
2d | Equilibration cylinder |
2e | Primary pressure sensor |
3 | Flowmeter, as applicable for each channel, with: |
3a | Flowmeter inlet line (capillary from pump head) |
3b | Flowmeter filter |
3c | Automatic purge valve with waste outlet |
3d | Flow sensor |
3e | Restrictor capillary |
3f | System pressure sensor |
3g | Flowmeter outlet with fluidic Tee piece (pump outlet) |
3h | Waste outlet |
4 | Capillary to system |
The pump is a binary pump with a flowmeter for flow control:
Each pump block has a working cylinder and an equilibration cylinder. The cylinders are connected in series. The solvent passes the cylinders successively.
Each pump block delivers flow continuously.
The working cylinder delivers while the equilibration cylinder is filled simultaneously. The equilibration cylinder serves as the reservoir and delivers while the working cylinder performs the intake stroke.The sensors in the flowmeter measure and control the partial flows of the pump blocks.
The partial flows are combined in the fluidic Tee piece at the flowmeter outlet. The combined flow leaves the flowmeter with the selected target flow rate and solvent composition.