Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

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Chromatographic Symptoms
3
Troubleshooting and Maintenance Guide 35
Retention Times Not Repeatable
• Replace the septum. (See the 5975T LTM GC/MSD Operation
Manual. )
• Check for leaks in the inlet, liner (as applicable), and
column connection. (See
“Checking for Leaks” on page 99.)
• Check for sufficient carrier gas supply pressure. The
pressure delivered to the instrument must be at least 40 kPa
(10 psi) greater than the maximum inlet pressure required
at final LTM column temperature.
• Run replicates of known standards to verify the problem.
• Verify that you are using the correct liner type for the
sample being injected.
• Consider if this is the first run. (Has the instrument
stabilized?)