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To Pump Down the MS
You can also use the 7890B GC control panel to perform this task. See
"Operating the MSD from the GC control
Make sure your MSD meets all the conditions listed in the introduction to this
WARNING
chapter
can result in personal injury.
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.
Procedure
1
2
Vent valve knob
3
4
5975/5977 Series MSD Operation Manual
(page
62) before starting up and pumping down the MSD. Failure to do so
Remove the analyzer window cover (see
page 76).
Close the MS vent valve by turning it clockwise. .
Plug the MS power cord into a grounded electrical outlet.
Turn on the MS power switch.
Operating in Electron Ionization (EI) Mode
panel"on page 47.
"Hydrogen
"To Open the MSD
3
Safety"on
Covers"on
79
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