When

  • To replace a pump head

  • During maintenance of pump head parts

Tools and additional items required

  • Hexagon wrench, size 6

  • Solvent suitable for purging to flush out harmful substances

Preparations

  1. To flush out harmful substances, purge the pump with an appropriate solvent.

Parts affected on the pump head

1423765
Figure: Pump head

No.

Description

1

Pressure sensor cable

2

Solvent line on inlet check valve

3

Pump head screw

4-6

Seal wash lines

7

Capillary connecting pump head and flowmeter

Follow these steps

  1. For the pump head for which you want to perform the procedure, undock the pistons from either the keypad (SELECT and DOCK buttons) or the ePanel in the chromatography data system.

  2. Wait until undocking is complete, before proceeding.
    Undocking is complete when the pump has stopped and the LED next to the FLOW button is flashing green for the selected pump head.

  3. Unplug the cable of the pressure sensor from the Pressure connector.

  4. Disconnect the solvent line on the inlet check valve.

  5. Remove the capillary that connects the pump head to the flowmeter.

  6. Remove the seal wash lines from the tubing connectors on the pump head. Do not remove the tubing connectors.

  7. Loosen the pump head screw with the hexagon wrench.

  8. Hold the pump head with one hand and remove the pump head screw.

  9. Remove the pump head by pulling out the head about 10 mm (0.5”), away from the pump front panel, and tilting down.

    The pistons are usually removed from the pump together with the pump head. If a piston remains in the pump, tilt and pull out the piston with your fingers.