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Waters

High delta psi (pressure unstable) on 2695 Separations Module- WKB44503

Article number: 44503

SYMPTOMS

  • High delta psi (more than 65psi or > 5% of system pressure) when the flow is set to 1 mL/min with column attached.

ENVIRONMENT

  • e2695 Separations Module.
  • 2695 Separations Module.

CAUSE

Faulty check valves.

FIX or WORKAROUND

  1. Replace the check valves with new valves of the correct type.  Standard check valves, PN 700000254
  2. If high delta psi or pressure fluctuation persists post new check valves replacement, then check system CD ratio.  If CD ratio > 1.80, consider to rebuild pump with Alliance solvent manager PM kit, PN 700004073.

ADDITIONAL INFORMATION

 

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