Ulvac VD30C - Pump Oil Level Check; Vacuum Pump Oil Check

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5.2.1 Pump Oil Level Check
The Pump oil level should be between the two level lines (MAX and MIN on the Pump case) on
the oil level gauge. (Refer to Fig.14)
5.2.2 Vacuum Pump Oil Check
The Pump oil might deteriorate in a shorter time depending on the use.
If substances of low boiling point (water, organic solvent, etc.) are mixed with pump oil or sludge
collects on the bottom of the Pump case, the ultimate pressure cannot be recovered by one oil
change, but the oil must be changed several times.
If the Pump is operated using pump oil containing much moisture content, the ultimate pressure
is rise, leading to poor function of the mechanical friction parts of the Pump. In the worst case, the
Pump will seize up and cannot be rotated.
The vacuum pump oil will be gradually deteriorated not only by contamination with sucked gas,
but also by temperature rise during pump operation.
It is recommended to replace the first Pump oil within 10 days after operation start, and see how
it got contamination, viscosity and discoloring to determine the oil replacement cycle. Check and
replace the oil periodically.
CAUTION
The oil level gauge is for checking the Pump oil level. Since the oil is
not circulating between the Pump case and the oil level gauge,
contamination or discoloring of the oil may not be observed on the oil
level gauge. Periodically drain approx. 50 ml, of oil through the drain
valve and check the oil for contamination and discoloring.
Table. 6 Recommended replacement cycle of the vacuum pump oil
Purpose Replacement timing
Vacuum system for study / laboratory, small vacuum system Within 6 months ~ 1 year
Vacuum system for production / vacuum evaporation Within 3 ~ 6 months
Vacuum valve exhaust system / large vacuum evaporation system Within 3 months
Metallurgy vacuum system such as thermal treatment, melting and
the like
Within 1 month
High vacuum dry / vacuum impregnation
vacuum formation and vacuum packing system
Within 1 month
Low vacuum dry / pug mill / food packing system Within 1 week