Vacuum System 6
5977B Series MSD Troubleshooting and Maintenance Manual 159
The standard foreline pump is a two-stage rotary-vane pump. An optional dry
pump is also available. The pump turns on when the MSD power is turned on.
The foreline pump has a built-in antisuckback valve to help prevent
backstreaming in the event of a power failure.
The foreline pump can be placed under the analyzer chamber at the rear of the
MSD (with the exhaust outlet to the rear) or on the floor below the MSD.
An oil trap (not shown) is available for the standard pump that can be used to
filter pump oil out of the foreline pump exhaust. This trap stops only pump
oil. Do not use the trap if you are analyzing toxic chemicals or using toxic
solvents or if you have a CI MSD. Instead, install an 11-mm id hose to remove
the exhaust from your lab.
A window (sight glass) in the front of the standard 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 trap supplied with the standard 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 have a
CI MSD. 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.
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