Varian 4000 GC - User Manual

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Varian, Inc.

2700 Mitchell Drive

Walnut Creek, CA 94598-1675/usa

4000 GC/MS

Hardware Operation Manual

Main Page

Table of Contents35
Introduction39
Functional Description41
Overview41
Transfer Line43
Analyzer44
Internal Ionization Configuration44
External Ionization Configuration46
Hybrid Configuration48
Ion Trap48
Detector50
Vacuum System51
Vacuum Manifold51
Foreline Pump51
Turbomolecular Vacuum Pump52
Ion Gauge52
Thermocouple Gauge53
Pneumatics53
Helium Flow54
Calibration Gas Flow54
The CI Reagent Gas Flow54
Electronics55
Controller56
Power Board57
Manifold Electronics58
RF Generator Assembly58
Ion Detection Board59
Ion Amplifier59
Electronic Flow Control59
Power Input Subsystem and Turbomolecular Pump Controller59
Main Power Circuit60
Periodic Maintenance61
Procedure Interval61
Checking Foreline Pump Oil Level and Oil Condition61
Changing Foreline Pump Oil61
Flushing the Pump Oil64
Changing the Oil Mist Cartridge65
Checking Cooling Fans66
MS Maintenance Procedures67
General Recommendations67
Recommended Tools and Materials67
Common Procedures68
Turning off the Mass Spectrometer68
Turning off the Mass Spectrometer with Nitrogen Purge70
Moving the Mass Spectrometer Away from the GC71
Removing the Analyzer Assembly71
Removing the Source/Ion Trap Assembly74
Reinstalling the Source/Ion Trap Assembly75
Reinstalling the Analyzer Assembly78
Turning on the Mass Spectrometer80
Checking the Vacuum Status82
Baking out the Mass Spectrometer83
Checking Ion Trap Operation83
Cleaning Procedures84
Cleaning the External Source84
Cleaning the Internal Ionization Assembly94
Cleaning Ion Trap Components98
Replacing a GC Column105
Removing the Capillary Column from the System105
Installing a New Capillary Column in the System106
Replacing Consumable Components109
Replacing External Source Filaments109
Conditioning the Filaments111
Replacing Internal Source Filaments111
Replacing the Electron Multiplier113
Replacing the Damping Gas Getter115
Replacing the Turbomolecular Pump115
Filling the Calibration Compound Vial116
Changing Operational Configuration117
Changing from Internal to External Configuration118
Changing from External to Internal Configuration118
Changing from Internal to Hybrid Configuration118
Changing from External to Hybrid Configuration118
Changing from Hybrid Mode to External Configuration118
Changing from Hybrid Mode to Internal Configuration118
Switching between External and Internal Sources118
Changing the Transfer Line Position from External to Internal119
Changing the Transfer Line Position from Internal to External121
Installing or Removing the Hybrid Plug123
Chemical Ionization Options125
Introduction125
Internal Configuration CI125
External Configuration CI125
Hybrid Configuration CI126
Installing CI Reagent Gas126
CI Reagent Gas Requirements127
Setting up the CI Reagent Gas Supply127
Checking the Reagent Gas Plumbing for Leaks130
Setting Flows of CI Reagents in Internal Configuration131
Internal Mode Default Parameters for CI Reagents131
External Mode Default Parameters for CI Reagents131
Ion Intensities for Standard CI Reagents132
Setting Flows of CI Reagents in External Configuration132
Setting Flows of CI Reagents in Hybrid Configuration132
The Liquid CI Inlet Option133
Filling/Refilling Reservoir Bulb133
Switching from Liquid to Gaseous CI Reagent Operation134
Troubleshooting135
How to Isolate a GC/MS Problem135
Checking the Data System135
Checking the GC135
Checking the Mass Spectrometer135
Troubleshooting Problems with Spectra136
No Spectrum Appears136
Loss of High Mass Peaks137
Part of the Spectrum Is Missing137
Poor Resolution with Acceptable Air and Water Levels138
Troubleshooting High Baseline at High Masses138
Checking for Leaks139
Establishing Conditions Required for Leak Checks139
Fixing a Large Air Leak140
Fixing a Small-To-Moderate Air Leak141
Checking GC Connections141
Troubleshooting Air Leaks Using Leak Detection Gas141
Fixing High Water Levels142
GC Troubleshooting143
Using the COLTEST Sample for Troubleshooting143
Running the COLTEST Sample143
Troubleshooting Common Chromatographic Problems144
Correcting Solvent Tailing or Broadening Problems144
Correcting Tailing Sample Peaks for Particularly Active Components145
Correcting Low Response and Severe Tailing with High Boiling Point Compounds145
Correcting Leading Sample Peaks (Reverse Tailing)145
Correcting Poor Resolution145
Lack of Peak Size Reproducibility146
Correcting Peak Splitting (Particularly for Low Boilers)146
Correcting Extra, Unexpected Peaks in the Chromatogram146
Correcting Retention Time Differences between Runs147
Miscellaneous Procedures and Instructions149
Other Documents149
Site Requirements149
Site Preparation149
Power149
Quality of Power152
Operating Environment152
Temperature152
Humidity153
Exhaust System153
Gas Requirements153
Helium - GC Carrier Gas153
Methane, Isobutane, Ammonia - CI Reagent Gases (with CI Option Only)154
Cryogenics154
How to Install the 4000 MS154
How to Move the 4000 MS155
Parts and Supplies156
Electronics156
Pneumatics156
Analyzer, Attached to Top Flange156
Analyzer, Attached to Manifold158
Chemical Ionization158
Vacuum158
O-Rings159
Miscellaneous/Other159
Test Samples160
Varian Service161

Brand	Varian
Model	4000 GC
Category	Laboratory Equipment
Language	English

Varian 4000 GC - User Manual

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