Varian 4000 GCMS, Installation Procedures Manual

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Open System Control
Open System Control and if necessary to start the pumps click the Start Up
button on the Startup/Shutdown tab. Monitor the Pump Spin Speed and Current
from Startup/Shutdown (refer to Figure 2.4). Normally, the turbo should run up to
100% in about 1 minute. Current is usually less than 300 mA when the turbo
reaches 100%.
Figure 2.4
4000 MS in External Mode
The 4000 MS in External Mode is equipped with Damping Gas. Once the
vacuum is established but before heating up the Getter, the MS pneumatics
should be purged by turning on the Damping Gas flow in Startup/Shutdown (refer
to Figure 2.4, click Turn On for Pneumatics). Set the Damping Gas Flow to 4
mL/min on the Module Attributes tab in Manual Control (refer to Figure 2.5, enter
4.0 mL/min and click
Activate Changes
) and purge the MS for approximately 20
minutes. After purging the MS pneumatics, set the Trap Damping Gas Flow as
appropriate for the external EI acquisition, for the external PCI acquisition, or the
external NCI acquisition. The appropriate Damping Gas flow rates can be found
embedded in the names of the test data files from the Test Files CD included
with the system, and also in the Module Attributes section of the Data File
Information dialog of each external data file. After purging and setting the
analytical damping gas flow rate, turn on the Getter heater (click Turn On for
Getter Control).