No beam from Xevo TQ-S - WKB922

SYMPTOMS

• For an acquisition, the chromatogram is constant at zero 
• No beam is seen—neither on the tune page when infusing nor with the LC pumping

ENVIRONMENT

• Xevo TQ-S
• Quattro Premier
• Quattro Premier XE
• Quattro LC
• Quattro LCZ
• Quattro micro API
• Quattro Ultima
• 3100 Mass Detector
• ACQUITY SQD system
• SQ Detector
• ACQUITY TQD system
• TQ Detector
• SQ Detector 2
• Xevo TQ MS
• Xevo TQD
• Xevo TQ-S
• Xevo TQ-S cronos
• Xevo TQ-S micro
• Xevo TQ-XS
• ZQ 2000
• ZQ 4000
• ZMD

CAUSE

The isolation valve is closed.

FIX or WORKAROUND

1. Open the isolation valve.

ADDITIONAL INFORMATION