Exchange the Needle Assembly

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		G4267-87201	Needle Assembly (for G7167C) OR
1		G7137-87201	Needle Bio-compatible (for G7137B)

Qty.

p/n

Description

G4267-87201

Needle Assembly

(for G7167C)

G7137-87201

Needle Bio-compatible

(for G7137B)

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.

WARNING

Toxic, flammable and hazardous solvents, samples and reagents

The handling of solvents, samples and reagents can hold health and safety risks.

When working with these substances observe appropriate safety procedures (for example by wearing goggles, safety gloves and protective clothing) as described in the material handling and safety data sheet supplied by the vendor, and follow good laboratory practice.

NOTE

It is recommended to always exchange the needle assembly and the needle seat at the same time to prevent premature leakage.

In the Agilent Lab Advisor software select Service & Diagnostics > Maintenance Positions > Change Needle , click Start and wait until the needle assembly is in maintenance position.

OR

In the Local Controller start the maintenance mode and select Change Needle function.
Open the front door.
Lock the needle in the safety position.
Sharp needle - Make sure the needle is in the safety lock position.
Damage of the loop - Avoid to change the loop shape. Do not pull or bend the loop too far.
CAUTION
Blockages inside of the needle assembly union
- Do not overtighten the fitting. A quarter turn should be sufficient.
Use a 1/4 inch wrench to tighten the fitting of the loop capillary.
Close the front door.
In the Local Controller close Change Needle.

OR

In the Agilent Lab Advisor software Change Needle , click Back and wait until the needle assembly is in the needle park station.
For G4767A, end the procedure with a Pressure Test.
For G7167C and G7137B, proceed with the subsequent steps.
Perform Hydraulic Path Leak Test.
Perform Sampler Leak Test if needed for troubleshooting in case of Hydraulic Path Leak failure.

21-Jun-2025