Compact design, ready to use, no set-up required. Constructed in highly chemical resistant materials. Quiet operation. 100% oil-free pumping of gases. Gas ballast as standard for working with condensable vapours. Good ultimate vacuum even with gas ballast. High vapour tolerance for water and solvents. Long service life, low maintenance. 611 NT(three-stage): with AK + EK; 1 electronically controlled and 1 manually controlled vacuum port. Characteristics and applications: With vacuum control: PC 611 NT: Proven solution for large rotary evaporators up to 20 l. Well-proven units for vacuum generation and control up to 1.5/3mbar ultimate vacuum, including high-boiling-point solvents. The PC 611NT has an additional, manually controlled, vacuum port.