CI Troubleshooting 3
Troubleshooting and Maintenance Manual 61
The filament or filament support is shorted to the ion source body or repeller.
Inspect the filament. If necessary, realign the filament support arms.
The electron inlet hole is blocked.
Inspect the electron inlet hole. If necessary, clean the hole with a clean
toothpick and a slurry of aluminum oxide powder and methanol. If the
electron inlet hole is that dirty, the entire ion source probably needs to be
cleaned.
Saturated methane/isobutane gas purifier
Replace the gas purifier.
Poor quality methane (purity below 99.99%)
Replace the methane with high-purity methane. If necessary, clean and purge
the reagent gas lines and clean the ion source.
No or low PFDTD signal, but reagent ions are normal
You are using any reagent gas but methane in PCI.
Switch to methane.
Wrong or corrupted tune file loaded
Check your tune file.
No PFDTD in the calibrant vial
Inspect the calibration vial on the GC side of the MS. If necessary, fill the vial
with PFDTD. Do not fill the vial completely; keep the level at least 0.5 cm from
the top of the vial.
The pressure of the methane entering the flow controller is too high.
Make sure the regulator on the methane supply is set to 10 psig (70 kPa).
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