When

Depending on the type of issue it might be required to replace needle seat and needle unit together or separately.

When

Remedial Action

Needle seat is clogged

1. Run the script: C21 – Clean Or Replace Needle Unit And Seat

2. If the script does not remove the blockage:
Replace needle seat, refer to Replacing Needle Seat.

3. Check needle unit for damages.

Needle seat is leaking

1. Tighten the needle seat with the torque screwdriver with needle seat bit. Also refer to Inspecting the Autosampler Valves for Leakage.

If the needle seat is still leaking:
Replace needle seat and needle unit together.

2. Replace needle seat, refer to Replacing Needle Seat.

3. Replace needle unit, refer to Replacing Needle Unit.

Needle is damaged

Replace needle seat and needle unit together:

1. Replace needle seat, refer to Replacing Needle Seat.

2. Replace needle unit, refer to Replacing Needle Unit.

Parts required

  • Needle unit

  • Needle seat

Tools required

  • Screwdriver, Torx T10

  • Torque screwdriver with needle seat bit

21
Figure: Tool to tighten the needle seat

No.

Description

1

Needle seat bit

2

Base part of the torque screwdriver

TIP

It is possible to run a script to get step by step instructions directly at the device. Run the script: C21 – Clean Or Replace Needle Unit And Seat for more information.