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3
Operating in Electron Ionization (EI) Mode
2
If you are using hydrogen as a carrier gas, the carrier gas flow must be off before
WARNING
turning off the MSD power. If the foreline pump is off, hydrogen will accumulate in
the MSD and an explosion may occur. Read
operating the MSD with hydrogen carrier gas.
Be sure the GC oven and the GC/MSD interface are cool before turning off carrier gas
CA UT IO N
flow to prevent damage to the column.
78
When prompted, turn the vent valve knob counterclockwise only 3/4 turns
or until you hear the hissing sound of air flowing into the analyzer
chamber.
"Hydrogen
Safety"on page 18 before
5975/5977 Series MSD Operation Manual
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