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High delta psi pressure fluctuations cause gradient test to fail on H-Class QSM - WKB28511

Article number: 28511

SYMPTOMS

  • GPV test fails
  • High delta psi
  • Pressure drops to 0 psi
  • The following parts were replaced without improvement:  column, active preheater, GPV, GPV filters, tubing from GPV to manifold, pump head seals, i2V check valve, passive check valve, primary actuator, accumulator actuator

ENVIRONMENT

  • ACQUITY UPLC H-Class
  • ACQUITY UPLC H-Class Quaternary Solvent Manager (QSM)

CAUSE

Faulty degasser pump

FIX or WORKAROUND

Replace the degasser pump (700001352).

ADDITIONAL INFORMATION

 

APH, gradient proportiniong valve, pressure ripple

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