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