Vacuum Technology Book, Volume II Operating fluid selection

Since operating fluid comes into contact with the media to be pumped, it is exposed to the influences of the media in question. Consequently, operating fluid should be selected on an individual basis in accordance with the respective application. Pfeiffer Vacuum offers various types of operating fluids that are suitable for all major applications. The pumps are factory-set for one type of operating fluid. The ultimate pressures of the rotary vane vacuum pumps that are specified in the catalog can only be ensured when using the operating fluid recommended by Pfeiffer Vacuum. The manufacturer cannot accept any liability for damage attributable to the use of other operating fluids. Different types of oil should never be mixed. Some oils do not mix and can cause damage to the pumping system.