ACQUITY UPLC Sample Manager with bent puncture needle leads to random missed injections - WKB19278

SYMPTOMS

• Instrument intermittently missed injections; missed at random, not method-specific
  • All re-injected samples were acceptable and consistent
• Replaced with new sample needle, sample loop, and injection valve
  •  30-µL steel needle
•  All plate types and all positions show a random missed injection
  • Waters 96-1mL plates and Waters 2-mL vials

ENVIRONMENT

• ACQUITY UPLC Sample Manager
• nanoACQUITY Sample Manager

CAUSE

Bent puncture needle led to random missed injections.

FIX or WORKAROUND

1. Replace puncture needle.

ADDITIONAL INFORMATION

Puncture Needle Cartridge, 12mm Effective, PN 700003898

Puncture Needle Cartridge, 9mm Effective, PN 700002773

Puncture Needle Original, PN 700002758