990 CLD Autoline™ Leak Detector
DR
AFT 2/2/04
4-7
20. Align the slit at 90° with the side walls of the spectrometer tube.
This also concentrically aligns the circular hole in the plate with the smaller guide
hole in the bottom of the ion source cavity.
21. Install the baffle through the cavity for the cold cathode gauge — alignment is not
necessary.
22. Wipe the new O-ring and mating surfaces with a clean lint-free cloth and place the new
ion source in the cavity.
The locating pin should be in the center of the guide hole. Be sure pins 1 and 8 are
parallel to the sidewall of the spectrometer tube.
23. Tighten the hold-down flange evenly and firmly holding a straight edge against pins 1
and 8 of both octal arrays to assure parallelism.
24. Install the preamplifier and cold cathode gauge, using new O-rings.
25. Tighten the clamps evenly and securely.
26. Install the cold cathode gauge housing and check it for proper orientation.
The anode should be visible when viewed through the KF port of the spectrometer tube.
27. Install the spectrometer tube in vacuum system.
28. Re-attach the magnet assembly, and before tightening the set screws, ensure that the
cylindrical pole pieces make metal-to-metal contact with the spectrometer tube body.
29. Attach the spectrometer tube to the vacuum system.
30. Start the mechanical pump in the vacuum system and turn the MAIN POWER switch to
the ON position.
31. When the spectrometer tube pressure is in the green band, proceed to re-tune the leak
detector as described in “Tuning Adjustments and Calibration Check” on page 3-4.
For optimum operation, allow the leak detector to stabilize for two hours after cleaning
the spectrometer tube.
32. Tune and calibrate the leak detector.
For instructions on tuning and calibrating the leak detector, refer to:
❑
“Tuning the Spectrometer Tube Using a Helium Reservoir Leak” on page 3-6
❑
“Calibrating the Leak Detector” on page 3-7.
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