SP Scientific VIRTIS 2K, Operator'S Manual, Page: 43 / 56

Rev 007, 10/11 33
© SP Scientific 2011
Chapter
8
General Maintenance
Proper routine maintenance is the key to an efficiently operating unit with minimal
downtime. The following section provides instructions on how to maintain your
BenchTop series freeze dryer.
Vacuum System
Vacuum Pump
Clean oil is necessary for the best vacuum and overall efficiency of the system.
Checking and changing the oil on a consistent basis will greatly extend the life of the
vacuum pump.
Check the vacuum pump oil after each freeze-dry cycle by draining a small amount
(~ 100 mL) from the pump drain line. Use a clear container to capture the sample. Oil
should be changed as needed.
When visually checking the oil, use the following guidelines:

Pale yellow or clear vacuum pump oil indicates good condition.

Dark vacuum pump oil indicates acid contamination.

Cloudy gray vacuum pump oil indicates water contamination.
Changing Vacuum Pump Oil
Change the oil immediately after shutting down the freeze dryer while the oil is still
hot.
Note: Consult your vacuum pump manual for more information.
1. Protect your hands from the hot oil.
2. Make sure vacuum is released from the system.
3. Remove the top fill plug and open the drain valve located at the bottom of the
pump. Drain the contaminated oil into a suitable container.
4. When the oil has completely drained, close the valve and add new oil to the
pump while visually checking the sight class to ensure proper level (near the
MAX line). Reinstall the fill plug.
5. If the pump oil is contaminated, operate the vacuum pump for about 10 to 15
minutes to flush any residual oil from the system’s interior components.
Repeat steps 3 and 4 to complete the process.
PROPERTY CAUTION! OIL MUST BE CHECKED AND CHANGED FREQUENTLY IF YOUR
PRODUCT CONTAINS CORROSIVE MATERIALS OR ORGANIC SOLVENTS. IN ADDITION,
A FILTER TRAP MAY BE INSTALLED TO PROTECT THE VACUUM PUMP.