03-914978-00:1
91
Mass Spectrometer Maintenance
9. Ensure the new seal and sealing surfaces are clean and free of particles and
fibers.
10. Fit the new seal to the Peltier baffle and lower the baffle into position on the
manifold. Do not allow the seal to twist.
11. Reconnect the Peltier baffle leads to the Peltier baffle. The pin and sockets
are differentiated by size.
12. Close the vent valve by lowering the vent valve lever.
13. Plug in the Saturn power cable.
14. Turn on the MS by switching ON the main power switch on the rear panel.
This allows the vacuum to correctly seat and seal the baffle assembly.
15. Refit the retaining nuts and front pillar. These should be snug.
16. Refit the Peltier baffle ducting by inserting the tabs into the rear panel and
pushing the front of the duct down onto the front post.
17. Turn the service switch to the OFF position.
18. Reconnect the transfer line, manifold, and trap heater cables.
19. Turn the service switch to the ON position.
20. Refit the top cover.
21. Carefully slide the MS up to the GC.
22. Bring up System Control to download the mass spectrometer software.
23. Bring up the diagnostics page by clicking on the “Diagnostics” tab.
24. Check the Vacuum Status. This will display a snap shot of the vacuum
system status, including any faults.
NOTE: The pressure should read below 500 mTorr within the first five minutes,
and
≤
100 mTorr within 45 minutes. Higher values may indicate a leak.
Refer to
Troubleshooting.
Cleaning the Diffusion Pump Peltier Baffle
To clean the Peltier baffle:
1. Remove the Peltier baffle.
2. Remove the seal to prevent solvent damage during cleaning.
3. Wipe the surfaces of the baffle with a clean, lint free cloth that has been
dampened with reagent grade acetone.
CAUTION
Do not immerse the assembly in acetone as it will contaminate porous
components, and damage seals.
4. Rinse with isopropyl alcohol.
5. Allow cleaned surfaces to air dry, or bake in the GC oven for 10 min at 100 °C.
6. Install the Peltier baffle, using the original seal.
