82 5977 Series MSD Operation Manual
3 Operating in Electron Ionization (EI) Mode
Check the side plate O-ring. Ensure the O-ring has a very light coat of
Apiezon L high vacuum grease. If the O-ring is very dry, it may not seal
well. If the O-ring looks shiny, it has too much grease on it. Refer to the
5977 Series MSD Troubleshooting and Maintenance Manual for lubricating
instructions.
2 Close the side plate.
3 Reconnect the side board control cables.
4 Make sure the vent valve is closed.
5 Pump down the MSD. See “To Pump Down the MSD in EI Mode” on
page 84.
6 If you are operating in CI mode, or if hydrogen or other flammable or toxic
substance is used for carrier gas, gently hand tighten the front side plate
thumbscrew.
Figure 14 Ion source wiring
FB = Feedthrough Board
Ion source
heater wires
Repeller
(red wire
from FB)
Filament 1
(white wires
from FB)
Ion focus lens
(orange wire
from FB)
Entrance lens
(blue wire
from FB)
Filament 2
(black wires
from FB)
Ion source
sensor wires
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