User manual

120 1260 Nanoflow Pump User Manual
8 Test Functions and Calibration
Leak Test
Pressure limit not reached but plateaus horizontal or positive
All plateaus negative
Probable cause Suggested actions
1 Degasser and pump channels A and/or B
not flushed sufficiently (air in the channels).
Purge the degasser and pump channels
thoroughly with isopropanol under pressure
(use the restriction capillary).
2 Wrong solvent.
Install isopropanol. Purge the degasser and
pump channels thoroughly.
Probable cause Suggested actions
1 Loose or leaky fittings.
Ensure all fittings are tight, or exchange
capillary.
2 Leaky mixer (if installed).
Tighten the mixer fittings and nuts.
3 Loose pump head screws in channel A or B.
Ensure the pump head screws in channels A
and B are tight.
4 Leaking seal or scratched piston in channel
A2 or B2.
Exchange the pump seals in both channels.
Check the pistons for scratches. Exchange if
scratched.
5 Leaking outlet valve in channel A or B.
Exchange the outlet valve.
6 Leaky damper.
Exchange damper.