TIP

A damaged needle unit also causes a damaged needle seat. For this reason, it is recommended to replace the needle seat together with the needle unit.

Follow these steps

  1. Remove the sample loop. Follow the corresponding removal steps in section Removing the Sample Loop. The connection to the injection valve can remain connected.

  2. Move the needle unit slightly to the front by hand.

  3. Secure the needle unit.

  4. Loosen the two screws that attach the needle unit to the needle carriage with the screwdriver.

  5. 1
    Figure: Unscrewing the needle unit

    No.

    Description

    1

    Screws attaching the needle unit to the needle carriage

  6. Pull the needle unit slightly to the front and remove it from the needle carriage.

NOTICE

The opening for the positioning sheet is sensitive to dust and debris.

Prevent any dust and debris from entering the interior of the autosampler.

WARNING

Sharp Tip of Injection Needle

The injection needle has a very sharp tip that can cause injury to the skin.

To avoid personal injury, never touch the needle tip.

NOTICE

Needle in the needle unit is not fixed.

  • Remove the needle unit carefully after unscrewing.
  • Handle the replacement needle unit with care especially after removing the transport lock.
  1. Unpack the replacement needle unit.

  2. Use the needle unit with the transport lock mounted. The transport lock will automatically be released during the needle unit mounting process and can be removed afterwards.

  3. Position the replacement needle unit on the needle carriage. Observe the following:

    • The protruding edge on the rear of the needle unit must fit properly in the opening on the needle carriage (see image).

    • The ridge on the rear side of the needle unit must match the recess on the needle carriage.

  4. Installing the needle unit to the needle carriage
    Figure: Installing the needle unit to the needle carriage

    No.

    Description

    1

    Opening on the needle carriage

    2

    Protruding edge on the needle unit

  5. Attach and tighten the two screws on the needle unit.

  6. Check if the lock and the vial pusher move upward easily.

  7. Moving lock for vial pusher upward
    Figure: Moving lock for vial pusher upward

    No.

    Description

    1

    Lock for the vial pusher

    2

    Vial pusher

  8. Unlock the needle unit.

  9. Move the needle unit slightly backwards above the wash port.

  10. Continue with steps in section Completing the Needle Seat and Needle Unit Replacement.