Preparations

  1. Remove the pump head. See Removing the Pump Head.

  2. Before you begin, note the information for reinstalling pump heads and installing new pump heads (replacement pump heads).

Reinstallation of pump heads (binary pump or dual pump only): Be sure not to interchange the pump heads.

  • Binary pump: To identify the correct installation position, note the labeling on the pressure sensor cable (A for the left pump head or B for the right pump head).

  • Dual pump: To identify the correct installation position, note the labeling on the U-tube (capillary from working cylinder to equilibration cylinder) (A for the pump head of the left pump or B for the pump head of the right pump).

Installation of new pump heads (replacement pump heads)

  • With binary pump and dual pump: New pump heads can be installed in either position when installed for the first time. They have no label on the pressure sensor cable or U-tube. For easier identification during future maintenance, consider labeling them according to the installation position (A for the left pump head or B for the right pump head).

  • To protect the pistons during shipment, the spacing tool is installed between the seal wash plate and the pistons. Remove the spacing tool. Be careful not to pull out the pistons any further.

Removing the spacing tool
Figure: Removing the spacing tool

No.

Description

1

Seal wash plate

2

Spacing tool

3

Pistons

Follow these steps

  1. Insert the pump head into the pump and tighten the pump head screw (recommended torque: 10 Nm).

  2. On the pump head, reconnect the following tubing and capillaries:

    • On the pump head inlet, reconnect the tubing. Avoid cross-threading.

    • Connect the seal wash lines to the tubing connectors on the pump head.

  3. Reconnect the capillary that connects the pump head to the purge/sensor unit. Observe the following:

    Install the capillary in the direction of solvent flow (indicated by the arrow on the capillary).

  4. Binary pump: Connect the cable of the pressure sensor to the P-WORK connector.

  5. Dock the pistons either from the keypad or from the Chromeleon software. Wait until docking is complete before proceeding with the next step.

  1. Flush the seal wash system with seal wash liquid (see Flushing the Seal Wash System).

  2. Purge the pump using the solvent of your application.

  1. Inspect all flow connections on the pump head for indications of leakage. Tighten leaky connections when the system pressure is down to zero.

  2. In the Chromeleon software, consider updating the Predictive Performance information for the pump head components.

  3. Test the seal wash system and pump for leakage (see Testing the Seal Wash System for Leakage and Testing the Pump for Leakage (General Test)).

  4. Recommended: From the Chromeleon software, perform performance qualification for the pump:

    • Run the pump-specific Performance Qualification tests (PQ tests) (= Flow Precision Test and Gradient Accuracy Test). For details, refer to the Operational and Performance Qualifications manual.

    • When the tests are completed, execute the QualificationDone command.