2000 MS Hardware Maintenance
80
Mass Spectrometer Maintenance
A Foreline
B Clamping
Ring
C Seal
D Inlet
E Gas
Ballast
Valve
F Drain
Plug
G
Oil Level Sight Glass
H Filler
Plug
I Exhaust
Foreline Pump
Purging Foreline Pump Oil
Condensable vapors accumulate in the foreline pump oil during routine
operation. These condensates will reduce pump efficiency and shorten the life of
the oil. However, the pump oil may be rejuvenated with a weekly purge.
Purging can be done without interrupting system operation. However, this should
not be done while the Saturn is acquiring data, when the filament is on, or the
electron multiplier is on.
To purge:
1. Place an exhaust vent over the open exhaust port.
2. With the foreline pump running, turn the gas ballast valve counterclockwise
to the open position. The pump will become noisy and emit oil vapor.
3. After 10 minutes, turn the gas ballast valve back to the closed position.
4. Remove the exhaust vent.
