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ACQUITY BSM/ QSM unable to compress during leak test - WKB12857

Article number: 12857

SYMPTOMS

  • BSM compresses to about 9,000-10,000 psi during dynamic leak test, and then terminates with error: "unable to compress" or "unable to maintain pressure" on primary pump
  • Accumulator pump passes leak test
  • The pump is airtight between the check valve on accumulator pump and the vent valve

ENVIRONMENT

  • ACQUITY UPLC BSM
  • ACQUITY H-Class QSM
  • ACQUITY I-Class BSM
  • ACQUITY Premier

CAUSE

Traces of rust and scratches on the head support plate or the seal wash housing cause a leak between them.

FIX or WORKAROUND

Replace the seal wash housing (700002597 for classic UPLC; 700009194 for I-class) and the head support plate (700002601).

ADDITIONAL INFORMATION

id12857, checkvalve, DLT, UPIBSM, UPIBSM+, UPISMFL, UPISMFL+, UPISMFTIVD, UPISMFTN, UPISMFTN+, UPQSM, UPQSM+, UPQSMBIO, UPQSMBIO+, UPSMFTN, UPSMFTN+, UPSMFTNB+, UPSMFTNBIO

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