Pressure ripple observed during gradient run on ACQUITY UPLC H-Class - WKB207190

SYMPTOMS

• Pressure ripple observed during gradient run on ACQUITY UPLC H-Class
• The retention time and peak shape of the analytes are not affected over the run
• The primary head fails the dynamic leak test 

ENVIRONMENT

• ACQUITY UPLC H-Class
• ACQUITY ARC

CAUSE

Sticking primary check valve

FIX or WORKAROUND

Replace the check valve (700005165). Click HERE for detailed steps and a video for check valve replacement. 

ADDITIONAL INFORMATION