irTis BenchTop 2K, 4K and 6
General Maintenance
Rev 007, 10/11 35
© SP Scientific 2011
5. Always install gaskets on a clean, grease-free metal rim. Remove excess
grease from the metal using isopropyl alcohol on a fresh paper towel or clean
cloth. Clean the gasket with isopropyl alcohol.
6. Once the new or cleaned gasket is installed, apply a very thin coating of high
vacuum grease to the outer surface of the gasket only. The gasket should
appear moist.
Vacuum Pump Gas Ballast Valve
The gas ballast valve removes some contaminants from the pump oil. During freeze-
drying or cold trap use, vapors may bypass the condenser and end up in the vacuum
pump. If this occurs, the vapors will degrade the oil causing excessive wear and poor
vacuum pressure.
When the ballast is open, it allows a controlled amount of air into the second stage
pump cylinder. This reduces the partial pressure, increases the pump’s operating
temperature and releases the vapors.
Note: Refer to the vacuum pump manual for the location of the gas ballast valve.
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