J SERIES M ICROV A CJ SERIES M ICROV A C VA CUUM PUM P V A CUUM PUM P
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3.2.3 Be sure the equipment being evacuated is properly cleaned and all vacuum breaks
are closed. Open pump intake valve.
3.33.3 CHECKIN G OIL LEVELCHECKING OIL LEVEL
3.3.1 Check oil level each day.
3.3.2 The oil level should be at center of sight glass or in low er half while pump is
operating at high vacuum. The level will change depending on suction pressure. In
most cases, oil is added after operating the pump for a short period of time.
3.3.3 To avoid loss of oil out the fill hole, do not add oil to the pump w hen in operation
unless pump is at 1 torr or less w ithout Gas Ballast.
NOTE:NOTE: When pumping gases that contain water vapor it may be necessary to remove the water When pumping gases that contain water vapor it may be necessary to remove the water
thathat condenses in the pump reservoir sump. This can be done by opening the oil drain t condenses in the pump reservoir sump. This can be done by opening the oil drain
valve and draining out w ater, and closing valve when oil starts to flow. The interval for valve and draining out water, and closing valve when oil starts to flow . The interval for
this must be determined for each specific operation and depends on the this must be determined for each specific operation and depends on the amount of amount of
w ater vapor and oil temperature. Operating the pump with the oil temperature nearw ater vapor and oil temperature. Operating the pump with the oil temperature near
160 Deg. F. (71 Deg. C.) w ill tend to minimize formation of w ater, but w ill not 160 Deg. F. (71 Deg. C.) w ill tend to minimize formation of w ater, but w ill not
eliminate it.eliminate it.
3.43.4 OPERA TION OF GAS BALLASTOPERA TION OF GAS BALLAST
WA RNIN G:WA RNIN G: WHEN OPENING GAS BWHEN OPENING GAS BALLAST VALVE ALLAST VALVE DO N OT DO NOT OPEN PAST THIRD M ARKOPEN PAST THIRD M ARKING ON ING ON
VALVE STEM . STEM VALVE STEM . STEM M AY BECOM E LOOSE AN M AY BECOM E LOOSE AND CAUSE HARM. D CAUSE HARM .
3.4.1 Open the Gas Ballast valve for maximum efficiency. For a lesser degree of ballasting, turn valve
tow ard close position. Full gas ballast will cause pump temperature to rise but this is normal.
For maximum effect of gas ballast, pump should be run at approximately 160 Deg. F. (71 Deg. C)
Operating temperature can be raised by throttling cooling water. Oil temperature control kits are
available from the factory. Consult Stokes Vacuum for specifications.
NOTE:NOTE: Be sure to remove the plastic plug in the Gas Ballast air intake. This plug is used for Be sure to remove the plastic plug in the Gas Ballast air intake. This plug is used for
shipping and storage purposes ONLY.shipping and storage purposes ONLY.
3.4.2 If pumping w ater vapor in excessive quantities, the oil may become contaminated. The oil can
be purified by running the pump with Gas Ballast valve full open w hile the pump is shut-off from
the system. When excessive contaminants are present, indicated by high oil level, or thinning,
formation of varnish, etc., the oil should be replaced.
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