5 Operating in EI Mode
Before You Turn On the MSD
5977B Series MSD Operating Manual 113
Before You Turn On the MSD
Verify the following before you turn on or attempt to operate the MSD.
• The vent valve should be open slightly (knob turned 45 degrees
counterclockwise from the fully closed position).
• All other vacuum seals and fittings must be in place and fastened correctly.
The front side plate screw should not be tightened, unless hazardous carrier,
JetClean system hydrogen, or reagent gases are being used.
• 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 GC inlet,
and the oven are off.
• Carrier gas of at least 99.9995% purity is plumbed to the GC with the
recommended traps. The regulator, plumbing, traps, EPC module, inlet, and
column have been purged of any gas to remove oxygen from the system.
• If hydrogen is used as carrier gas, or JetClean system supply, the carrier gas
and JetClean system supply shutoff valves must be closed, and the analyzer
top sideplate thumbscrew must be loosely fastened.
• The foreline pump exhaust is properly vented.
The exhaust from the foreline pump contains solvents and the chemicals you
are 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 (standard pump) and install a hose 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 hydrogen is used as a carrier gas or JetClean system supply, the carrier and
JetClean system supply shutoff valves must be closed before turning off the
MSD power. If the foreline pump is off, hydrogen will accumulate in the MSD
and an explosion may occur. Read “Hydrogen Safety” on page 24 before
operating the MSD with hydrogen gas.
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