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. PC 520 NT(two-stage): with AK + EK; 2 electronically controlled vacuum ports. Characteristics and applications: With vacuum control: PC 520 NT: Synchro chemistry pumping units with two, independent, vacuum controllers for running two separate processes. PC 520 with 7 / 12mbar ultimate vacuum.