ACQUITY PDA/2998 fails SQT wavelength accuracy test at 205 nm - WKB95925

SYMPTOMS

• 205 nm wavelength accuracy test failure, successful 273 nm test 
• Flushing with Magic Mix does not resolve
• New flow cell does not resolve 

ENVIRONMENT

• ACQUITY UPLC PDA Detector
• 2998 Photodiode Array Detector
• Agilent LC

CAUSE

Unknown contaminant in water that absorbs at low wavelength causes test to fail.

Unknown contaminant in methanol that absorbs at low wavelength causes test to fail.

FIX or WORKAROUND

1. Use fresh water in a clean solvent bottle.
2. Use a different high-quality methanol (a new lot number, etc.).   

ADDITIONAL INFORMATION