Agilent Technologies 1100 Series User manual

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Exchanging the Multi-Channel Gradient Valve on the G1311A,
1100 Series Quaternary Pump

Repairing the Pump
Exchanging the Multi-Channel Gradient Valve (MCGV)
Exchanging the Multi-Channel Gradient
Valve (MCGV)
NOTE The lifetime of the multi-channel gradient valve can be maintained by
regularly flushing the valve, especially when using buffer solutions. If using
buffer solutions, flush all channels of the valve with water to prevent
precipitation of the buffer. Salt crystals can be forced into an unused channel
andformplugsthatmayleadtoleaksofthatchannel.Suchleaks willinterfere
with the general performance of the valve
When using buffer solutions and organic solvents in the HP 1100 Quaternary
Pump it is recommended to connect the buffer solution to one of the bottom
portsandtheorganicsolventtooneoftheuppergradientvalveports.Itisbest
to have the organic channel directly above the salt solution channel (e.g., A -
saltsolution, B - organic solvent).
Parts required MCGV (exchange assembly, G1311-69701)
Tools required Pozidriv #1
Preparations for this
procedure Switch thequaternary pump offat the power switch. Remove the front cover to have access to the pump mechanics.

Repairing the Pump
Exchanging the Multi-Channel Gradient Valve (MCGV)
1Disconnect the connecting tube and the
solvent tubes from the MCGV, unclip them
from the tube clips and place them into the
solvent cabinet to avoid flow by hydrostatic
pressure. Unclip the waste tube from the
cover and remove the waste funnel from the
pump.
2Pressthe lowersidesof thecoverto unclipit.
Remove the cover.
3DisconnecttheMCGVcable,unscrewthetwo
holding screws and remove the valve. 4Place thenewMCGVintoposition.Makesure that the valve is positioned with the
A-channel at the bottom-right position.
Tighten the two holding screws and connect
the cable to its connector.
Waste
tube
Cover
MCGV
Waste
funnel
Connecting tube MCGV to AIV
Solvent
tubes
Cover
MCGV
cable
Holding
screws
MCGV
cable
Holding
screws
Channel A

Repairing the Pump
Exchanging the Multi-Channel Gradient Valve (MCGV)
5Replace the MCGV cover. Reconnect the
waste funnel with the waste tube holder in
the top cover. Insert waste tube in the holder
in the waste pan and clip tube to the MCGV
cover.
6Reconnectthetubefromtheactiveinletvalve
to the middle position of the MCGV and then
the solvent tubes at channel A to D of the
MCGV. Make sure the orientation of the
channels on the cover is labelled as shown
below, otherwhise re-label the cover.
Cover
Waste
funnel
Waste
tube
Cover
MCGV
Waste
funnel
Connecting tube MCGV to AIV
Solvent
tubes