InstallationItem no. 10402003, Revision 02 23 ( 40 )8.3 Compressed air8.3.1 Air purity classes (ISO 8573-1)Solid impurities Class 3Filter grade at least 5 μm for solidsWater content Class 4Max. pressure dew point +3 °CTotal oil content Class 3Max. oil content 1 mg/m38.3.2 Setting the sealing airFor guidelines on air quality,see "Air purity classes (ISO8573-1) [} 23]" section.The adjustment value for the sealing air depends on the hose diameter andlength.Ü Hose diameter: DN 4Ü The setting value can be found in the following diagram.Ü To ensure effective control, turn on the sealing air and cooling when turn-ing on the machine. This protects the HF spindle even when it is stationary.Lowest sealing air supply Dry machiningMedium sealing air supply Machining with spray waterHighest sealing air supply Machining with hose water