Exchange the Needle Seat

For bio-inert modules use bio-inert parts only!

For biocompatible modules use bio / biocompatible parts only!

Do not mix with bio-inert parts.

When

Tools required

Qty.		p/n	Description
1		8710-0510	Open-end wrench 1/4-5/16 inch

Parts required

Qty.	p/n	Description
1	G4267-87012	High Pressure Needle Seat, 0.12 mm (PEEK) OR
1	G4267-87020	High Pressure Seat Assembly 0.075 mm (PEEK) OR
1	G5668-87017	Bio-inert Seat ID 0.17 (for G5668A)
1	G7137-87012	High pressure seat assembly 0.12 mm Biocompatible (for G7137A)
1	G7137-60075	High Pressure Seat Bio ULD

Prerequisites

Finish any pending acquisition job.
Stop the flow at the pump and remove the solvent lines from the eluent bottles to avoid spilling solvent.
Close the shutoff valves at the pump if available.

WARNING

Risk of injury by uncovered needle

An uncovered needle is a risk of harm to the operator.

NOTE

In the Local Controller start the maintenance mode and select Change needle/seat function.

OR

In the Agilent Lab Advisor software select Service & Diagnostics in the system screen Maintenance Positions > Change Needle , click Start and wait until the needle assembly is in maintenance position.
Slightly pull (1.) the front clip which holds the needle seat in position. Then carefully lift up (2.) the complete leak tube needle assembly from the holder.
In the Local Controller close Change needle /seat.

OR

In the Agilent Lab Advisor software Change needle click End and wait until the needle assembly is in the needle park position.
Perform a Pressure Test.

NOTE

Always flush the sampler with fresh solvent and perform a pressure test before using the Auto Clean or Prime function after exchanging a needle seat.

21-Jun-2025