Replacing The Electron Multiplier - Thermo Scientific TSQ 8000 Evo Hardware Manual

Replacing the Electron Multiplier

Thermo Scientific
The lifetime of the electron multiplier is directly related to the current that flows through it
and the amount of contamination or condensation it receives. The electron multiplier will last
longer if you:
• Maintain the best possible vacuum.
• After pumping down, allow the instrument enough time to equilibrate before you start
running samples again.
• Monitor the GC/MS for background contamination and immediately repair leaks.
• Keep tuning and detector calibration to a minimum.
To replace the electron multiplier:
Note To order a new electron multiplier, refer to the TSQ 8000 Evo Spare Parts Guide.
1. If you are using hydrogen, cool down the injector to prepare the GC for powering off. See
the GC documentation for information. After the heated zones are cooled down,
power-off the GC if you are using hydrogen.
WARNING BURN HAZARD: The injector, oven, and transfer line may be hot. Allow them
to cool to room temperature before touching them.
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 "Hydrogen Safety Precautions"
2. Shut down the TSQ 8000 Evo system using the software. See the TSQ 8000 Evo User
Guide for more information.
3. Click the Yes button to continue the shutdown process. The heaters and the
turbomolecular pump power off. Then the foreline pump powers off.
4. Reach around the left side of the instrument and push down on the power switch to
power-off the instrument.
5. If you are using hydrogen, unscrew the hydrogen safety screw on the front door.
1
Performing Routine Maintenance
on page xvii of the Preface for more information.
TSQ 8000 Evo Hardware Manual
Replacing the Electron Multiplier
61