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5
Operating in EI Mode
Before You Turn On the MS
102
7000/7010 Series TQ GC/MS Operating Manual
Before You Turn On the MS
Verify the following
before
you turn on or attempt to operate the MS.
•
The vent valve must be closed (the knob turned all the way clockwise). (See
•
All other vacuum seals and fittings must be in place and fastened correctly.
All analyzer plate thumbscrews should be open, unless hazardous carrier,
JetClean system hydrogen, or reagent gases are being used.
•
The MS is connected to a grounded power source.
•
The GC/MS interface extends into the GC oven.
•
A conditioned capillary column is installed in the GC inlet and in the GC/MS
interface.
•
The GC is on, but the heated zones for the GC/MS 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.
•
If hydrogen is used as carrier gas or JetClean system supply, the carrier gas
and JetClean system supply shutoff valves must be closed. The top
thumbscrew on the front analyzer side plate and the top thumbscrew on the
rear analyzer side plate must both be loosely fastened.
•
The foreline pump exhaust is properly vented.
WARNING
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. 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.
WARNING
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
MS power. If the foreline pump is off, hydrogen will accumulate in the MS and
an explosion may occur. Read
on page 21 before operating
the MS with hydrogen gas.