HP 5973 - Baseline Wanders; Retention Times for All Peaks Drift - Shorter; Retention Times for All Peaks Drift - Longer

3 Troubleshooting the MSD
Chromatographic symptoms
73
Baseline wanders
• Insufficient carrier gas supply pressure*
• Malfunctioning flow or pressure regulator*
• Intermittent leak in the injection port*
* These could cause a fault condition in the GC that would prevent the GC from
operating.
Retention times for all peaks drift – shorter
• Column has been shortened
• Initial oven temperature was increased
• Column is getting old
Retention times for all peaks drift – longer
• Column flow has been reduced
• Initial oven temperature was decreased
• Active sites in the sample path
• Leaks in the injection port*
* This could cause a fault condition in the GC that would prevent the GC from
operating.