User manual

1260 Nanoflow Pump User Manual 119
Test Functions and Calibration
8
Leak Test
Evaluating the Results
Defective or leaky components in the pump head lead to changes in the Leak
Tes t pressure plot. Typical failure modes are described below.
No pressure increase or minimum pressure of plateau 1 not reached
NOTE
Please notice the difference between an error in the test and a failure of the test! An error
means that during the operation of the test there was an abnormal termination. If a test
failed, this means that the results of the test were not within the specified limits.
NOTE
Often it is only the damaged blank nut itself (poorly shaped from overtightening) that
causes a failure of the test. Before investigating on any other possible sources of failure
make sure that the blank nut you are using is in good condition and properly tightened!
Probable cause Suggested actions
1 Pump not running.
Check the logbook for error messages.
2 Wrong solvent-line connections to solvent
selection valve.
Ensure the solvent lines from the degasser to
the solvent selection valve are connected
correctly.
3 Loose or leaky fittings.
Ensure all fittings are tight, or exchange
capillary.
4 Large leaks (visible) at the pump seals.
Exchange the pump seals.
5 Large leaks (visible) at active inlet valve or
outlet valve.
Ensure the leaky components are installed
tightly. Exchange the component if required.