134 Troubleshooting and Maintenance Manual
6 Vacuum System
A window (sight glass) in the front of the foreline pump shows the level of the
foreline pump oil. There are two marks next to the window. The level of the
pump oil should never be above the upper mark or below the lower mark. If
the level of pump oil is near the lower mark, add foreline pump oil.
The oil pan under the foreline pump can be a fire hazard
Oily rags, paper towels, and similar absorbents in the oil pan could ignite and
damage the pump and other parts of the MS.
The oil trap supplied with the foreline pump stops only foreline pump oil. It does not
trap or filter out toxic chemicals. If you are using toxic solvents or analyzing toxic
chemicals, remove the oil trap. do not use the trap if you are using a CI MS. Install a
hose to take the foreline pump exhaust outside or to a fume hood.
Do not place the foreline pump near any equipment that is sensitive to vibration.
The ballast control knob controls the amount of air allowed into the pump. Keep the
ballast control closed (fully clockwise) at all times, except when ballasting the pump.
Combustible materials (or flammable/nonflammable wicking material) placed
under, over, or around the foreline (roughing) pump constitutes a fire hazard.
Keep the pan clean, but do not leave absorbent material such as paper towels in it.
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