User manual

Bio-inert Quaternary Pump User Manual 111
Maintenance
9
Overview of Maintenance
Overview of Maintenance
The following pages describe maintenance (simple repairs) of the pump that
can be carried out without opening the main cover.
Tab le 8 Simple Repair Procedures
Procedure Typical Frequency Notes
“Checking and Replacing the Solvent
Filter” on page 113
If solvent filter is blocked Gradient performance problems, intermittent
pressure fluctuations
“Exchanging the Active Inlet Valve (AIV) or
its Cartridge” on page 114
If internally leaking Pressure ripple unstable, run Leak Rate Test for
verification
“Exchanging the Outlet Valve” on page 117 If internally leaking Pressure ripple unstable, run Leak Rate Test for
verification
“Exchanging the Purge Valve Frit or the
Purge Valve” on page 119
If internally leaking Solvent dripping out of waste outlet when valve
closed
“Exchanging the Purge Valve Frit or the
Purge Valve” on page 119
If the frit shows indication
of contamination or
blockage
A pressure drop of > 10 bar across the frit (at a
water flow of 5 mL/min with open purge valve)
indicates blockage
“Maintenance of the Pump Head” on
page 126
If pump performance
indicates seal wear
Leaks at lower pump head side, unstable
retention times, pressure ripple unstable — run
Leak Rate Test for verification
Exchanging pistons, see “Maintenance of
the Pump Head” on page 126
If scratched Seal life time shorter than usual — check
pistons while changing the seals
“Exchanging the Optional Interface
Board” on page 134
If defective Error condition, indicated by red status
indicator