Shutdown Symptoms 5
Agilent 7890 Series Troubleshooting 115
To recover from a hydrogen shutdown state:
1 Fix the cause of the shutdown:
• Replace the inlet septum. See the Maintenance manual.
• Replace the inlet O-ring. See the Maintenance manual.
• Check for broken column.
• Check the supply pressure. Make sure the gas supply
meets the pressure recommendations listed in the Agilent
GC, GC/MS, and ALS Site Preparation Guide.
• Check the system for leaks. See Leak Check Tips.
2 Power cycle the GC.
3 After the GC powers back on, press the key for the device
that initiated the shutdown. Scroll to the pneumatic
parameter that is flashing Off, then press [On] or [Off]. For
example, if the front inlet ran out of carrier gas, press [Front
Inlet], scroll to the pressure or flow parameter, then press
[On].
• After a column shutdown, you can turn on a detector gas
flow even if the keyboard is locked by a data system.
Hydrogen sensor
If equipped with the optional hydrogen sensor, the GC will
perform a hydrogen safety shutdown if the sensor measures an
uncombusted hydrogen concentration of about 1 % in the oven
(about 25 % of the lower explosive limit for hydrogen).
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