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3
Operating in Electron Ionization (EI) Mode
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 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
• The GC is on, but the heated zones for the GC/MSD interface, the GC inlet,
• Carrier gas of at least 99.9995% purity is plumbed to the GC with the
• If hydrogen is used as carrier gas, carrier gas flow must be off and the front
• The foreline pump exhaust is properly vented.
The exhaust from the foreline pump contains solvents and the chemicals you are
WARNING
analyzing. If using the standard foreline pump, it also contains traces of pump oil. If
you are using toxic solvents or analyzing toxic chemicals, remove the oil trap/mist
filter (standard pump) and install a hose (11-mm id) to take the foreline pump
exhaust outside or to a fume (exhaust) hood. Be sure to comply with local
regulations. The oil trap supplied with the standard pump stops only pump oil. It
does not trap or filter out toxic chemicals.
If you are using hydrogen as a carrier gas, do not start carrier gas flow until the
WARNING
MSD has been pumped down. If the vacuum pumps are off, hydrogen will
accumulate in the MSD and an explosion may occur. Read
page 18 before operating the MSD with hydrogen carrier gas.
64
The front side plate screw should not be tightened, unless hazardous carrier
or reagent gases are being used.
GC/MSD interface.
and the oven are off.
recommended traps.
sideplate thumbscrew must be loosely fastened.
"Hydrogen
5975/5977 Series MSD Operation Manual
Safety"on
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