J SERIES M ICROV A CJ SERIES M ICROV A C VA CUUM PUM P V A CUUM PUM P
PAGE 3 -4
400 Torr for more than 10 minutes or at intermediate vacuums for periods
w hich cause oil temperature to exceed 200 Deg. F. (93 Deg. C.)
For optimum pump operation the oil temperature in the oil reservoir should be
between 140 Deg. F. (60 Deg. C.) and 160 Deg. F. (71 Deg. C.) w ith the pump
operating on the system or process. Oil temperature can be measured by inserting
a thermometer in the fill hole or by contact pyrometer on oil line near the solenoid.
If the pump is to be operated with oil temperature in excess of 160 Deg. F.(71 Deg.
C.) the use of a heavier viscosity oil is recommended. (See Section 2.6.)
3.6.2 When starting the pump or handling large amounts of air, oil vapor in the form
of smoke will issue from the exhaust. Again this is no indication of trouble, as the
volume of smoke w ill decrease as the pressure in the system decreases.
NOTE:NOTE: Stokes Vacuum closed type oil mist separator is available to alleviate exhaust oil smog.Stokes Vacuum closed type oil mist separator is available to alleviate exhaust oil smog.
3.6.3 If the pump has been shut dow n for an extended period, alw ays turn the pump over
at least two (2) revolutions by hand before starting to insure free movement of
parts.
3.6.4 Low oil temperature can cause overloading w hen starting the pump and possibly
prevent the pump from sealing. M icrovac pumps should not be started when the oil
temperature is below 55 Deg. F. (13 Deg. C)* Optimum operating oil temperature
after starting is between 140 Deg. F. (60 Deg. C.) to 160 Deg. F.(71 Deg. C.)
Opening the Gas Ballast valve w ill help w arm-up the oil. A Water M iser is
recommended to automatically control the oil temperature.
* THIS APPLIES ONLY IF STOKES V-LUBE “ F” IS USED. CONSULT STOKES IF OTHER OILS ARE USED.
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