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Figure 3.7
3.5 Cal Gas Adjustment
Confirm the Cal Gas vial has been filled by checking behind the MS front door.
Adjust the Cal Gas needle valve so it is approximately half way open (turn the
valve all the way clockwise and then turn 6-8 turns counter clockwise). Refer to
Section 4 of this document and run the Auto Tunes. From the Checks and
Adjustments tab in Manual Control highlight Cal Gas Adjustment and click
Start
(refer to Figure 3.8). Adjust the Cal Gas needle valve behind the MS front door
until the display indicates the Cal Gas pressure is OK. Click
Done
when finished.
NOTE: The Cal Gas adjustment can vary with variations in auto tune settings,
filament emission current, system sensitivity, and system background levels.
Therefore, this adjustment may need to be revisited after auto tuning, editing the
filament emission current, or when system sensitivity or background levels
change.
Summary of Contents for 4000 GCMS
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