Waters Prep Series Installation And Maintenance Manual page 96

Incorrect retention time troubleshooting
Retention time
problem
No
Retention
time
erratic?
Yes
See previous page
3-12 Troubleshooting, Testing, and Maintenance
Ret. time
incorrect, but
reproducible?
Yes
Are pressure
Yes
fluctuations same
as during normal
operation?
No
Yes
Is pressure
constant, but
different?
No
Large pressure
No
drop associated
with one pump
head?
Yes
Yes
Purge pump.
pressure Still
erratic?
Yes
Call Waters
technical service
Possible causes:
- Wrong mobile
phase
- Wrong/degraded
column
- Incorrect
wavelength
No
Solvent
Yes
proportioning
valve broken?
No
Is pump set
to correct flow
rate?
Yes
Yes
Is system
leaking?
Pump broken;
troubleshoot
pump
Troubleshoot
pump
Change flow
rate
Isolate/
troubleshoot
leak