56 Troubleshooting and Maintenance Manual
3 CI Troubleshooting
Poor vacuum without reagent gas flow
Excess water
Allow the instrument to bake out more and flow reagent gas through the lines
to purge any accumulated water.
Air leak
Run Methane Pretune. See the See the Agilent 7200 Accurate-Mass Q-TOF
GC/MS System Operation Manual. A visible peak at m/z 32 indicates air in the
system. Check for and correct any leaks. See “Air Leaks” on page 52.
The foreline pump is not working properly
For the standard foreline pump, replace the pump oil. If that does not help,
contact your local Agilent Technologies Customer Engineer.
The turbo pumps are not working properly
Check the pump speed. It should be at least 95%. Contact your local Agilent
Technologies service representative.
High pressure with reagent gas flow
The reagent gas flow rate is too high
On the flow controller, turn down reagent gas flow as appropriate. Verify that
reagent ion ratios are correct.
Air leak
Run Methane Pretune. See the See the Agilent 7200 Accurate-Mass Q-TOF
GC/MS System Operation Manual. Visible peak at m/z 32 indicates air in the
system. Check for and correct any leaks. See the “Air Leaks” on page 52.
Use of ammonia as reagent gas can shorten the life of the foreline pump oil (with
standard pump) and possibly of the foreline pump itself. See “To Minimize Foreline
Pump Damage from Ammonia” on page 90.
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