03-914978-00:1
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Mass Spectrometer Maintenance
•
Take care not to completely unscrew the two inner clamping screws. (If
you should unscrew them, restart the screws after you have removed the
turbomolecular pump from the instrument.)
12. Remove the outside bottom clamping screw.
13. Remove the bottom clamp as you hold the turbomolecular pump in place.
14. Remove the outside top clamping screw (closest to the transfer line).
15. Remove the top clamp as you hold the turbomolecular pump in place.
16. Pull the turbomolecular pump to the rear and lift it clear of the instrument.
17. Remove the large seal from the turbomolecular inlet, and place it on the inlet of
the new turbomolecular pump (03-920542-00). The orientation of the seal is not
important.
•
On the new turbomolecular pump, leave the red cap over the
turbomolecular exhaust port.
18. Carefully slide the new turbomolecular pump and seal into position on the end of
the manifold.
•
Make sure the electrical connection (turbomolecular cable) is tilted
towards the bulkhead, i.e., toward the left as viewed from the rear of the
instrument.
•
Take care not to scratch the sealing surface on the manifold in front of
the turbomolecular pump.
19. Insert the top clamp and loosely fasten it into place.
20. Insert the bottom clamp and loosely fasten it into place.
21. Tighten all four clamping screws until snug.
22. Reconnect the turbomolecular cable. Rotate the retaining ring clockwise with
downward pressure to lock the cable into position.
23. Remove the red cap over the turbomolecular exhaust port.
24. Place the seal on the turbomolecular pump exhaust port.
25. Reconnect the vacuum hose elbow and clamp.
26. Reconnect the pneumatics exhaust tube.
27. Make sure that the vent valve is closed.
28. Turn on the rear-panel main power switch.
29. Snug up the top and bottom clamp screws.
30. Monitor the turbomolecular pump speed using Diagnostics under Vacuum
System Status.
31. Once the pump is running satisfactorily, replace the side panel, top cover, and
slide the GC and Saturn GC/MS back together.
32. Discard the old turbomolecular pump. Be sure to comply with all applicable
health and safety regulations.
