4-30 Maintaining and Troubleshooting the Waters 515 Pump
Pump not
delivering eluent
(continued)
Immiscible eluents in
pump head
Purge pump with appropriate
eluents. Verify miscibility of
eluents being used and change to
more miscible eluents.
Dirty or malfunctioning
inlet or outlet check
valve
Clean the check valves (see
“Cleaning and replacing check
valves” on page 4-18).
Damaged plunger seal
(indicated by eluent
leaking from behind the
pump head or by salt
crystal build-up around
the back of the pump
head)
Verify if both pump heads can
maintain pressure as outlined in
“Performing the ramp-and-decay
test” on page 4-3). If a head is
leaking, replace the plunger seal
(see “Cleaning and replacing
seals and plungers” on page 4-9).
Pump cavitation due to
one of the following:
Eluent reservoirs
positioned at or below
the height of the pump
Loose, bent, or blocked
inlet tubing
Improperly degassed
eluent
Dirty eluent reservoir
inlet filter
Volatile eluents in pump
head
Tubing ID too small
Perform the following corrective
action:
Raise eluent reservoirs above the
pump.
Check tubing. Tighten,
straighten, or replace tubing.
Degas or helium sparge eluents.
Replace filter.
Prime pump (see “Priming the
pump” on page 3-15).
Use correct tubing.
Ruptured high-pressure
noise filter (indicated by
leak at bottom of front
bezel)
Contact Waters Technical
Service.
Troubleshooting error messages and pump malfunctions (Continued)
Symptom Possible cause Corrective action
To Next Page
Loading...
