Technical Data Displacement 　 50Hz 42.5 m3h-1 / 25 ft3min-1 60Hz 50.5 m3h-1 / 29.7 ft3min-1 Speed (Pneurop) 　 50Hz 37 m3h-1 / 21.8 ft3min-1 60Hz 44 m3h-1 / 25.9 ft3min-1 Number of stages 2 Ultimate vacuum (total pressure) 　 Without gas ballast 1.0 x 10-3 mbar / 7.7 x 10-4 Torr With gas ballast 7.0 x 10-3 mbar / 5.4 x 10-3 Torr Inlet connection ISO40 Outlet connection 25 mm flange suitable for NW25 Maximum outlet pressure 0.5 bar gauge Maximum inlet pressure for water vapor 0.2 kg h-1 / 0.4 lb h-1 Weight 72 kg / 159 lb Motor protection rating IP44 or IP54 Motor power 　 50Hz 1.1 kW / 1.5 hp 60Hz 1.5 kW / 2 hp Standard oil capacity 　 maximum 3.5 liter / 3.2 qt minimum 1.32 liter / 1.6 qt PFPE oil capacity 　 Maximum 3.5 liter / 3.2 qt Minimum 1.32 liter / 1.6 qt Recommended oil Ultragrade 70 Noise level 65 dB (A)