Agilent Technologies 7890A Troubleshooting Manual page 68

4
GC Not Ready Symptoms
The Inlet Pressure or Flow Fluctuates
68
A fluctuation in inlet pressure causes variations in the flow
rate and retention times during a run. Do the following:
• Check if the gas purifier or gas generator is operating at
or near capacity.
• Check the supply gas for sufficient delivery pressure.
• Verify that the supply pressure regulator is functioning
properly.
• Check for leaks. (See "Checking for Leaks".)
• Check for large restrictions in the inlet liner or split vent
trap.
• Verify that the correct liner is installed.
• Check for a restriction in headspace, purge and trap, and
any other external sampling devices.
Troubleshooting