200 5977B Series MSD Troubleshooting and Maintenance Manual
7 Analyzer
Filament care
Similar to the filaments in incandescent light bulbs, the ion source filaments
will eventually burn out. Certain practices reduce the chance of early failure:
• If you have an optional G3397B Micro-Ion vacuum gauge, use it to verify
that the system has an adequate vacuum before turning on the analyzer,
especially after any maintenance was performed.
• If you are controlling your MSD from the Manual Tune screen, always select
MSOff before changing any of the filament parameters.
• When setting up data acquisition parameters, set the solvent delay so that
the analyzer will not turn on while the solvent peak is eluting.
• When the software prompts Override solvent delay? at the beginning of a run,
always select NO.
• Higher emission current reduces filament life.
• Higher electron energy reduces filament life.
• Leaving the filament on for short times (1 minute) during data acquisition
reduces filament life.
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