1
Performing Routine Maintenance
Replacing a Dual Filament
Thermo Scientific
ISQ 7000 Hardware Manual
91
Replacing a Dual Filament
The number of ions produced in the ion source is proportional to the filament emission
current. If the measured emission current is erratic, substantially less than the set emission
current value, or if the measured emission current is decreasing, you may need to replace the
dual filament because it has failed or is failing. Also, if one of the filaments has burned out, it
may be time to replace it.
You can increase the life of your dual filament by:
• Setting the solvent delay so that the analyzer will not turn on while the solvent peak is
eluting.
• Not overriding the solvent delay at the beginning of a run.
• Selecting a lower emission current.
• Ensuring the system is leak tight. The diagnostic leak test should be less than 7%. See
for more information.
• Turning off the filament when changing the filament parameters in the software.
To replace the dual filament
1. Cool down the GC oven.
2. If you are using hydrogen as a carrier gas, cool down the injector to prepare the GC for
powering off. See the GC documentation for more information. After the heated zones
are cooled down, power-off the GC.
Note
See the
ISQ and TSQ GC-MS Spare Parts Guide
for information about ordering a
new filament.
Note
Click the
Instrument Control
button in the Xcalibur Status panel to switch
between filaments A and B.
WARNING BURN HAZARD:
The injector, oven, and transfer line may be hot. Allow them
to cool to room temperature before touching them.
AVERTISSEMENT RISQUE DE BRÛLURE
: l’injecteur, le four et la ligne de transfert
peuvent être chauds. Laissez-les refroidir à la température ambiante avant de les toucher.
WARNING FIRE HAZARD:
If you are using hydrogen as a carrier gas, you must cool down
and shut off the GC to prevent the buildup of hydrogen in the vacuum manifold. See the
of the Preface for more information.
Содержание ISQ 7000
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Страница 174: ...2 Troubleshooting Contacting Technical Support 146 ISQ 7000 Hardware Manual Thermo Scientific ...
Страница 400: ...3 Advanced Maintenance Replacing Fans and Filters 372 ISQ 7000 Hardware Manual Thermo Scientific ...