Skip to main content
Waters

Missed sample injections due to bent puncture needle with ACQUITY UPLC SM - WKB19278

Article number: 19278

SYMPTOMS

  • Instrument intermittently misses injections; misses are random, not method-specific
    • All re-injected samples were acceptable and consistent
  • 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 variable vial and well plate punctures, and hence to missed injections.

FIX or WORKAROUND

  1. Replace puncture needle.

ADDITIONAL INFORMATION

Not able to find a solution? Click here to request help.