Waters Prep Series - Page 96

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