ACQUITY Sample Manager-FL intermittent error: "Sample pressure low" - WKB202034

SYMPTOMS

• "Sample pressure low (##): possibly no wash solvent" error appears intermittently.
• Sample and wash syringe leak tests pass.
• Needle seal leak test passes.
• Back pressure regulator passes.
• Needle seal and needle loop and volume characterizations pass.
• No visible leaks at wash manifold.
• When inspecting needle wash port, needle seal o-ring looks fine (p/n - 700002572)

ENVIRONMENT

• ACQUITY UPLC Sample Manager
• ACQUITY UPLC I-Class

CAUSE

Worn threads on needle wash port or over use of teflon tape

FIX or WORKAROUND

1. Remove excess teflon tape on threads of needle wash port and apply a fresh wrap or replace needle wash port (part number - 700002886)

ADDITIONAL INFORMATION