Agilent Technologies 7890A Troubleshooting Manual page 66

4
GC Not Ready Symptoms
A Gas Does Not Reach Setpoint Pressure or Flow
66
If an inlet does not reach its pressure setpoint, it will shut
down in an amount of time determined by the type of inlet.
Do the following:
• Check for sufficient gas supply delivery pressure. The
pressure at the supply should be at least 10 psi greater
than the desired setpoint.
• Check for leaks. (See "Checking for Leaks".) If using gas
saver, be sure that the gas saver flow rate is high enough
to maintain the highest column- head pressure used
during a run.
• Check for an incorrectly installed column.
If you are using a split/splitless inlet, MMI inlet, PTV inlet,
or volatiles interface:
• Check the split ratio. Increase the amount of split flow.
Troubleshooting