Agilent Technologies 1220 Infinity II LC User Manual page 149

Table 27
Potential Cause
Degasser and pump not flushed sufficiently (air
in the pump head).
Wrong solvent.
Table 28
Potential Cause
Loose or leaky fittings.
Loose purge valve.
Contaminated purge valve.
Loose pump head screws.
Leaking seals or scratched plungers.
Leaking outlet valve.
Leaky damper.
Table 29
Potential Cause
Air in pump or new seals not yet seated.
Loose active inlet valve.
Loose pump head screws.
Loose outlet valve.
1220 Infinity II LC System User Manual
Pressure limit not reached but plateaus horizontal or positive
All plateaus negative
First plateau positive, second and third plateau negative
Test Functions and Calibration
Solvent Delivery System
Corrective Action
Purge the degasser and pump thoroughly with
isopropanol under pressure (use the restriction
capillary).
Install isopropanol. Purge the degasser and
pump thoroughly.
Corrective Action
Ensure all fittings are tight, or exchange
capillary.
Tighten the purge valve (14 mm wrench).
Open and close purge valve to flush out
contamination. Exchange the valve if still leaky.
Ensure the pump head screws are tight.
Exchange the pump seals. Check the plungers
for scratches. Exchange if scratched.
Exchange the outlet valve.
Exchange damper.
Corrective Action
Flush pump thoroughly with isopropanol under
pressure (use restriction capillary).
Tighten the active inlet valve (14 mm wrench). Do
not overtighten!
Ensure the pump head screws are tight.
Ensure the sieve in the outlet valve is installed
correctly. Tighten the outlet valve.
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