Micromeritics Gemini VII 2390a Operator's Manual page 410

6 Maintenance and Troubleshooting
The oil in the vacuum pump should be changed every three months when the efficiency of the vacuum
pump declines (requiring increased time to reach vacuum levels) or if it becomes discolored.
Inspect the Oil
View the vacuum pump oil through the oil-level window. The oil level should be midway between the
indicators on the oil-level window when the pump is running. Oil in good condition is clean, clear or light
in color and transparent. Change the oil if it has darkened.
Change or Add Oil
Drain the oil while the pump is warm and disconnected from the power
source.
Use oil supplied by Micromeritics or refer to the vacuum pump manual for other acceptable oils.
1. Unplug the vacuum pump from the power source.
2. Loosen the wing nut on the clamp at the top of the oil vapor trap. Swing the clamp open and
remove the trap from the hose.
6 - 4 Smart VacPrep Operator Manual