Pressure below lower limit – Agilent Technologies Quaternary Pump 1100 Series User Manual
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Troubleshooting and Test Functions
Pressure Below Lower Limit
Pressure Below Lower Limit
The system pressure has fallen below the lower pressure limit.
Probable Causes
•
Lower pressure limit set too high.
•
Air bubbles in the mobile phase.
•
Leak.
•
Defective damper.
•
Defective LPM board.
Suggested Actions
❏ Ensure the lower pressure limit is set to a value suitable for the analysis.
❏ Ensure solvents are degassed. Purge the quaternary pump.
❏ Ensure solvent inlet filters are not blocked.
❏ Inspect the pump head, capillaries and fittings for signs of a leak.
❏ Purge the quaternary pump. Run a pressure test to determine whether the
seals or other pump components are defective.
❏ Exchange the damper.
❏ Exchange the LPM board.