Exchange the Metering Seal and Piston

When

Injection volume reproducibility problems are observed.
Leaks or blockages are observed.
The limit for the metering seal EMF counter is exceeded.
The metering seal needs to be replaced as part of the yearly maintenance.

Tools required

Qty.	p/n	Description
1	8710-0510	Open-end wrench 1/4-5/16 inch
1	5023-2524	Hex Key Set (part of the G7120-62708 InfinityLab LC Series Tool Kit)
1	01018-23702	Insert tool (for 100 µL analytical head)
1	G4226-43800	Seal insert tool (for 40 µL analytical head)
1		Pair of tweezers
1	05980-60051	Cloths, clean, lint-free 15/pk
1		Isopropanol or any other appropriate solvent

Parts required

Qty.	p/n	Description
1	0905-1717	Metering Seal, 40 µL OR
1	0905-1503	Metering Seal, 100 µL OR
1	0905-1294	Metering Seal, 900 µL
1	5067-5920	Piston, 40 µL, Zirconium oxide for 40 µL analytical head OR
1	5067-5678	Piston, 100 µL, Zirconium oxide for 100 µL analytical head OR
1	G4267-60462	Piston, 900 µL, Sapphire

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.

NOTE

When the instrument setup has changed, configure the new setup in the online view of the Chromatographic Data System. See The Vialsampler user interface.

In the Agilent Lab Advisor software, select Service & Diagnostics > Maintenance Positions > Change Metering Seal and Piston , click Start and wait until the metering plunger is in maintenance position.

OR: In the Local Controller start the maintenance mode and select Change Metering Device function.
Use a seal insert tool to carefully remove the seal.
Clean the chamber and the plunger with a piece of lint-free cloth and an appropriate solvent, such as isopropanol. Check the plunger for sings of scratches or damage and if necessary, replace it. Ensure that all particulate matter is removed from the chamber.
Use the plastic side of the insert tool to install the new seal. Press the seal firmly into position.
In Lab Advisor, select Next to move the piston back into its normal position and then Back to finish the maintenance procedure.

OR: In the Local Controller, select Continue to move the piston back into its normal position and then Exit to finish the maintenance procedure.
Perform a System Pressure Test.

21-Jun-2025