Varian 979 Series, Operation Manual

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Model 979 Series Helium Mass Spectrometer Leak Detector
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DRAFT 9/15/03
4-3 Removing the Connectors .................................................................................................. 4-7
4-4 Wing Nut ............................................................................................................................. 4-8
4-5 KF-25 Quick Clamp ............................................................................................................ 4-8
4-6 Magnet Body Bracket Screws............................................................................................. 4-9
4-7 Magnet Assembly Slotted Screws .................................................................................... 4-10
4-8 Tuning Magnet Set Screws............................................................................................... 4-10
4-9 Button TC Assembly ......................................................................................................... 4-11
4-10 Removing the Button TC .................................................................................................. 4-11
4-11 Button TC Wires (View with Header on) ........................................................................... 4-12
4-12 Removing the Ion Source ................................................................................................. 4-13
4-13 The Ion Source ................................................................................................................. 4-14
4-14 Ion Source Cavity ............................................................................................................. 4-14
4-15 Ground Slit Plate............................................................................................................... 4-15
4-16 Removing the Preamplifier ............................................................................................... 4-15
4-17 Magnetic Pole Piece ......................................................................................................... 4-16
4-18 Removing the O-ring from Magnetic Pole Piece............................................................... 4-16
4-19 Removing the Second Magnetic Pole Piece..................................................................... 4-17
4-20 Discolored Ground Slit Plate............................................................................................. 4-17
4-21 Discolored Ground Magnet Pole Piece............................................................................. 4-18
4-22 VacuSolv Cleaning Wipe .................................................................................................. 4-18
4-23 Inspecting the O-ring ........................................................................................................ 4-19
4-24 Spectrometer Tube Reassembly ...................................................................................... 4-19
A-1 System Control and Communication Panel ........................................................................A-1
A-2 Optically Isolated Output Circuit Sketch .............................................................................A-2
A-3 Optically Isolated Input Circuit Sketch ................................................................................A-3
A-4 979 COM Cable Wiring Diagram ........................................................................................A-4
C-1a Test Piece Evacuated: Tracer Probe Used to Locate Leak ................................................C-6
C-1b Test Piece Evacuated and Hooded with Helium Atmosphere to
Determine Overall Leak Rate .............................................................................................C-6
C-2 Test Piece Pressurized: Detector Probe Used to Locate Leak...........................................C-6
C-3 Test Piece Sealed with Helium or Mixture of Helium and Other Gases:
Bell Jar Used to Determine Overall Leak Rate ...................................................................C-7
C-4 Mass Spectrometer Leak Detector .....................................................................................C-8
C-5 Magnetic Separation Principle ............................................................................................C-9