2000 MS Hardware Maintenance
92
Mass Spectrometer Maintenance
Removing the Diffusion Pump
1. Turn off the MS.
2. Carefully separate the MS from the GC by approximately 250 mm (10").
Be
careful not to break the GC column.
3. Remove the top cover.
4. Remove the transfer line.
5. Rotate the MS to give full accessibility to the left side.
6. Remove the four screws holding the left side cover in place, and remove the
cover.
7. Remove the small clamp from the diffusion pump’s exhaust port by unscrewing
the red wing nut, removing the screw, turning the clamp so the open end faces
the diffusion pump, and pulling the clamp toward you.
8. Lift the elbow up and secure it to the manifold lugs with a rubber band or tie
wrap.
CAUTION
Be careful not to scratch or damage sealing surfaces.
A Elbow
B
Rubber Band
C
Inlet Seal
D
Diffusion Pump
Elbow Positioning for Diffusion Pump Removal
9. Unscrew the wing nut on the diffusion pump’s inlet clamp approximately ten
turns.
10. Grip the inlet clamp with both hands and push the wing nut into the clamp until
the clamp loosens.
11. Hold pump with left hand and remove inlet clamp by moving the wing nut screw
to the left, opening clamp and pulling around the flanges and out.
12. Lower the pump onto the base pan.
13. Remove the inlet seal and place on a clean lint free surface for later use.
