Operating in Electron Ionization (EI) Mode 3
5975/5977 Series MSD Operation Manual 79
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 panel”on page 47.
Procedure
1 Remove the analyzer window cover (see “To Open the MSD Covers”on
page 76).
2 Close the MS vent valve by turning it clockwise. .
3 Plug the MS power cord into a grounded electrical outlet.
4 Turn on the MS power switch.
WARNING
Make sure your MSD meets all the conditions listed in the introduction to this
chapter (page 62) before starting up and pumping down the MSD. Failure to do so
can result in personal injury.
WARNING
If you are using hydrogen as a carrier gas, do not start carrier gas flow until the
MSD has been pumped down. If the vacuum pumps are off, hydrogen will
accumulate in the MSD and an explosion may occur. Read “Hydrogen Safety”on
page 18 before operating the MSD with hydrogen carrier gas.
Vent valve knob
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