The GC has an alarm that beeps if there are problems with the carrier gas or heated zones.
If the carrier gas pressure is too low to maintain current flow setpoints, the alarm beeps for 1 to 2 minutes. If, after that time, the pressure is still too low, the GC heated zones turn off and the column flow stops. A message should appear on the GC display
If the GC is configured for hydrogen carrier gas, the entire GC will shut down and the alarm will beep continually until you press [Clear].
Heating the column with no carrier gas flow can damage it. This is most likely on the ends of the column that are inside the injection port and GC/MSD interface. If the oven is very hot when the carrier gas flow fails, the entire column can be damaged. Leaks that allow oxygen into the column can also damage it.
If you suspect column damage, replace the column or remove the column and break off the ends before reinstalling it. If the column has previously been conditioned, it is not necessary to do it again.
Possible causes of a carrier gas alarm include:
The supply pressure should be at least 10 psi above the pressure setpoint. If it is not, increase the supply pressure. If necessary, replace the carrier gas supply.
Leaking carrier gas line
A major leak somewhere in the carrier gas path can cause the alarm. Possible locations include:
Tubing between the carrier gas supply and the GC
Carrier gas fittings within the GC
Injection port
Broken column
Visually and physically inspect all fittings. Make sure they are not leaking. Check the injection port for leaks. Make sure the column is not broken. See the user information supplied with your GC for more information.
Make sure the tubing is not pinched, bent, or otherwise constricted.
Refer to the user information supplied with your GC or contact your Agilent Technologies service representative.