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Mass Spectrometer Maintenance
e. If the heater does not pull out freely, a second application of penetrating
oil may be necessary.
9. Apply the anti-seize compound to the new heater and install it in the base.
10. Refit the insulating pad, retaining plate, harness clamp, ground wire, nuts, base
plate, and retaining screws.
11. Install over temperature switch.
12. Pour the diffusion pump fluid (P/N 03-930639-01) through one of the holes in the
diffusion pump’s inlet baffle. P/N 03-930639-01 contains 40cm
3
. This is a full
charge, plus an allowance for fluid that remains on the walls of the container.
NOTE: Fluid is highly viscous and takes five minutes for a full charge to reach
the reservoir and show in the sight glass.
13. Add fluid until the level is midway in the “Full Cold” zone.
14. Wipe any spillage from the inlet baffle using a clean lint free cloth.
15. Install the diffusion pump in the MS.
ATTENTION
IMPORTANT NOTE: The new heater will give off an odor during the first thirty
minutes of operation. The odor results from the baking of the anti-seize lubricant,
and certain compounds used in the manufacture of heaters. This is normal.
Reinstalling the Diffusion Pump
1. Reconnect the diffusion pump cable to the diffusion pump controller.
2. Place the pump, base first into the diffusion pump compartment and tilt upright.
CAUTION
Be careful not to scratch or damage sealing surfaces.
•
The exhaust elbow should be on the right side of the pump.
3. Inspect the inlet seal. Replace if it is worn or damaged
(27-402294-00).
4. Wipe the inlet seal clean with a lint free cloth, rub a thin layer of diffusion pump
fluid onto the O-ring, and place the seal onto the inlet port.
5. Lift the pump into position on the manifold flange and hold.
6. From the left side of the pump, feed the inlet clamp plain end first around the inlet
flange.
7. Close the clamp and loosely fasten the wing nut.
8. Rotate the pump so the exhaust port is visible through the cut out in the sheet
metal.
9. Let go of the pump.
