990 CLD Autoline™ Leak Detector
vi
DRAFT 2/2/04
Section 4. Maintenance ................................................................................................................ 4-1
Daily Maintenance ..................................................................................................................... 4-3
Leak Detector Sensitivity Check ............................................................................................ 4-3
Annual Maintenance – Complete Overhaul ................................................................................ 4-3
As-Required Maintenance........................................................................................................... 4-4
Removing, Cleaning, and Re-installing the Spectrometer Tube.............................................. 4-5
Enhancement Magnet Adjustment ......................................................................................... 4-8
Ion Source Replacement ....................................................................................................... 4-8
Electronics System .................................................................................................................... 4-10
Emission Control Adjustment .............................................................................................. 4-10
Ion Source Voltages Range Validation................................................................................. 4-11
Overpressure Protection Adjustment ................................................................................... 4-12
Amplifier Offset Adjustment ................................................................................................ 4-13
Residual Background Check ............................................................................................... 4-14
Subassembly Replacement .................................................................................................. 4-14
Troubleshooting........................................................................................................................ 4-15
General............................................................................................................................... 4-15
Leak Detector Self-Test ....................................................................................................... 4-16
Symptom Checklist ............................................................................................................. 4-17
Section 5. Parts List ..................................................................................................................... 5-1
How to Order Parts..................................................................................................................... 5-1
Major Components ............................................................................................................... 5-2
Independent Electrical Components Kits ............................................................................... 5-3
Electrical Components Kit ..................................................................................................... 5-4
Independent Mechanical Items ............................................................................................. 5-4
Mechanical Components Kit ................................................................................................. 5-5
Spectrometer Tube Components Kit ...................................................................................... 5-5
Section 6. Fundamentals of Leak Detection .............................................................................. 6-1
Leak Testing — Why is it Needed?.............................................................................................. 6-1
Terminology ............................................................................................................................... 6-2
Facts about Leak Rates .......................................................................................................... 6-3
Methods of Testing for Leaks....................................................................................................... 6-4
Water Immersion (Air Bubble Observation)........................................................................... 6-4
Dye Penetrant ....................................................................................................................... 6-4
Ultrasonic ............................................................................................................................. 6-4
Radioisotope ......................................................................................................................... 6-4
Helium Method .................................................................................................................... 6-4
Helium Mass Spectrometer Leak Detection (MSLD) .................................................................... 6-5
Helium as an Ideal Tracer Gas .............................................................................................. 6-5
Helium Background Management......................................................................................... 6-5
Principles of Mass Spectrometry............................................................................................ 6-5
Application as a Leak Detector ............................................................................................. 6-5
The Reason to Vacuum ......................................................................................................... 6-6
Spectrometer Tube -What It Does, in brief ............................................................................ 6-6
Glossary of Terms ....................................................................................................................... 6-7
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