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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.