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H-Class System dynamic leak test fails - WKB15309

Article number: 15309

SYMPTOMS

  • System dynamic leak test (DLT) fails to pressurize or compress
  • When compression occurs, the accumulator actuator suffers very high leaks, above 11,000 psi
    • QSM DLT passes
    • New sample needle, inject valve/pod, and needle seat/seal
    • SM-FTN calibrations and seal characterization pass
  • Instrument fails to compress at 14,000 psi and cannot complete system DLT
    • Pressure rises to ~13700 psi, drops to ~1000 psi, and then compresses again, forming a wave shape on the pressure trace
    • Bypass vent valve: QSM repeatedly passes system DLT (values of 62 nL/min Accumulator and 23 nL Primary leak rates)
    • Vent valve connected: DLT Accumulator leak rate is ~16,900 nL/min

ENVIRONMENT

  • ACQUITY H-Class QSM
  • ACQUITY H-Class FTN

CAUSE

Faulty vent valve cartridge (pod); rotor seal unable to hold pressure (no compression).

Intermittent leaking at port 1 tubing of vent valve (contributes to occasionally high leak rate).

FIX or WORKAROUND

  1. Replace part number 700002660 for the "ASSY, CARTRIDGE, VENT VALVE" in the QSM.
    • Reference ACQUITY UPLC H Class Quaternary Solvent Manager Operator’s Overview and Maintenance Guide 
      • See under "Maintaining the Quaternary solvent manager" and "Replacing the vent valve cartridge"
  2. Replace the following tubing assemblies to manage suspected leaks at high-pressure fittings:
    • 430002316 - ASSY, TUBE,  XDUCER - VENT VALVE, QSM
    • 430002319 - ASSY, TUBE, VENT VALVE P2 TO FILTER, QSM
    • 430002452 - ASSY, TUBING, GP PUMP OUTLET

ADDITIONAL INFORMATION

  • Mobile phase
    • Line A: water with 0.1% acetic acid
    • Line B: methanol with 0.1% acetic acid

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