ACQUITY BSM shows inconsistent flow during prime, fails leak test - WKB224495

SYMPTOMS

• Inconsistent flow observed from waste outlet during prime 
• Pressure trace in console shows fluctuations in accumulator during solvent transfer
• Accumulator fails to compress during leak test
• PM recently competed
• Accumulator head, seal wash housing, and tubing replaced

ENVIRONMENT

• ACQUITY UPLC BSM

CAUSE

Loose rotor mechanism in the vent valve prevents valve from aligning properly.

FIX or WORKAROUND

Replace the vent valve:

• Classic ACQUITY BSM: 700002660
• I-Class BSM: 700006052

ADDITIONAL INFORMATION

The rotor mechanism in a vent valve can be tested by manually turning the valve with pliers. If little or no resistance is felt, the valve has failed.