Xevo TQD shows no chromatographic peaks for any samples - WKB13446

SYMPTOMS

• No peaks when injecting or infusing
• Vials pierced
• No error messages
• Tune page readbacks OK
• System pressure normal
• No leaks
• Rebooted system

ENVIRONMENT

• Xevo TQD
• ACQUITY TQD system
• TQ Detector
• Xevo TQ MS
• Xevo TQ-S
• Xevo TQ-S micro
• Xevo TQ-XS
• MassLynx

CAUSE

The isolation valve is closed.

FIX or WORKAROUND

Open the isolation valve. On the Xevo TQD, the isolation valve is open when the arrow is horizontal.

ADDITIONAL INFORMATION