Varian 4000 MS, User Manual

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12
Conversion from External to Internal Configuration
Converting the 4000 MS from External to Internal configuration involves changing
both the ion source and the column position. The External ion source assembly is
removed from the trap assembly and replaced with the Internal ion source
assembly.
See the
4000 GC/MS Hardware Operation Manual
for details.
Checklist
•
Remove the analyzer from the MS manifold.
•
Change the ion source to internal.
•
Move the heat shield to the forward position.
•
Add the filament adapter and connect the flex cable.
•
Change the transfer line orientation.
•
Change the transfer line tip.
•
Cut the column to 7 mm.
•
Change the transfer line switch to Internal/Hybrid.
•
Replace the analyzer in the MS manifold.
Conversion from Hybrid to Internal Configuration
Changing from the Hybrid to Internal configuration only requires changing the ion
source. The column position and transfer line are already directed to the trap and
do not need to be adjusted.
Outline
1. Change the ion source.
2. Move the heat shield to the forward position.
3. Add the filament adapter and connect the flex cable.
Effects of Hardware Configuration Changes
After changing the configuration, for example from External to Internal
configuration, the following occurs when System Control is restarted.
1. System Control compares the current configuration stored in the current
Module Attributes with the configuration reported by the hardware.
2. If these do not match, the Module Attributes are updated (preset) to the
appropriate configuration. A similar process occurs for the default method
(Default.mth).
3. After making the hardware configuration change, new methods will have the
appropriate instrument configuration by default.
NOTE: Presetting the Module Attributes requires performing all Auto Tune
routines, because the prior Auto Tune results are invalid.