32
Operating the MSD
Operation of the MSD is primarily from the data system
Except for the main power switch, the MSD has no switches, knobs or other
physical controls. You control the MSD through a data system equipped with
MSD Productivity ChemStation software. The software performs tasks such
as pumpdown, monitoring pressures, setting temperatures, tuning, and
preparing to vent. These tasks are described in this chapter. Data acquisition
and data analysis are described in the manuals and online help supplied with
the MSD ChemStation software.
Some conditions must be met before you turn on the MSD
Verify the following
before you turn on or attempt to operate the MSD.
• The vent valve must be closed (the knob turned all the way clockwise).
• All other vacuum seals and fittings must be in place and fastened
correctly. (The the front side plate screw must be secure, but not
over tight).
• The MSD is connected to a grounded power source.
• The GC/MSD interface extends into the GC oven.
• A conditioned capillary column is installed in the GC inlet and in the
GC/MSD interface.
• The GC is on, but the heated zones for the GC/MSD interface, the
injection port, and the oven are off.
• Carrier gas of at least 99.999% purity is plumbed to the GC with the
recommended traps.
• If hydrogen is used as carrier gas, carrier gas flow must be off, and the
front sideplate thumbscrew must be loosely fastened.
• The foreline pump exhaust is properly vented.
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