Flow and Pressure Control Part 4. Flow and pressure problems
A gas does not reach the setpoint pressure or flow
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Part 4. Flow and pressure problems
A gas does not reach the setpoint pressure or flow
The gas cannot reach the pressure entered at the keyboard. If an EPC inlet does
not reach its pressure setpoint it will shut down in an amount of time determined
by the type of inlet:
• The gas supply pressure is too low to reach the setpoint. The pressure at the
supply should be at least 10 psi greater than the desired setpoint.
• A large leak is present somewhere in the system. Use an electronic leak
detector to find leaks; correct them. Don’t forget to check the column—a
broken column is a very large leak.
• If you are 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.
• The flow is too low for the column in use.
• The column is plugged or misinstalled.
• The inlet or detector pressure sensor is not operating correctly. Contact your
Agilent service representative.
If you are using a split/splitless, PTV inlet, or volatiles interface:
• The split ratio is too low. Increase the amount of split flow.
• The inlet proportional control valve is stuck because of contamination or
other fault. Contact your Agilent service representative.
If you are using a purged packed or cool on-column inlet:
• The inlet control valve is stuck closed because of contamination or other
fault. Contact your Agilent service representative.
Type of inlet Time before shutdown
Purged packed, cool on-column 2 minutes
Split/splitless, PTV, volatiles inteface 5.5 minutes
Auxiliary 4 minutes
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