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5
Foreline pump
Foreline pump
The foreline pump reduces the pressure in the vacuum manifold so the high vac-
uum pump can operate It also pumps away the gas load from the high vacuum
pump. The foreline pump is connected to the high vacuum pump by a 130-cm hose
called the foreline hose.
The foreline pump is a two-stage rotary-vane pump. The foreline pump turns on
when the MSD power is turned on. The foreline pump has a built-in anti-suckback
valve to help prevent backstreaming in the event of a power failure.
The foreline pump can be placed under the vacuum manifold at the rear of the
MSD (with the exhaust outlet to the rear), or on the floor below the MSD.
The MSD shipping kit includes an oil trap (not shown) that can be used to filter
pump oil out of the foreline pump exhaust. This trap stops only pump oil. If you
are analyzing toxic chemicals or using toxic solvents, do not use the trap. Instead,
install a hose to take the foreline pump exhaust outside or to a fume hood.
: $ 5 1 , 1 *
7KH IRUHOLQH SXPS H[KDXVW FRQWDLQV WUDFHV RI VROYHQWV DQDO\WHV DQG IRUHOLQH SXPS RLO 7KH
VXSSOLHG RLO WUDS VWRSV RQO\ SXPS RLO ,W GRHV QRW WUDS RU ILOWHU RXW WR[LF FKHPLFDOV ,I \RX DUH
XVLQJ WR[LF VROYHQWV RU DQDO\]LQJ WR[LF FKHPLFDOV UHPRYH WKH RLO WUDS DQG LQVWDOO D KRVH WR
WDNH WKH IRUHOLQH SXPS H[KDXVW RXWVLGH RU WR D IXPH KRRG
& $ 8 7 , 2 1
Do not place the foreline pump near any equipment that is sensitive to vibration.
& $ 8 7 , 2 1
The ballast control knob controls the amount of air allowed into the pump. Keep the ballast
control closed (fully clockwise) at all times.
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.
See Also
To check and add foreline pump oil, page 102
194
Vacuum System
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