Pump units with the combination of an oil-free chemistry diaphragm pump with a Roots pump leads to a significant increase in pumping speed and improves ultimate vacuum by an order of magnitude.

• Low ultimate vacuum <0,2 mbar
• Corrosion resistance and active pollution control
• Virtually oil-free vacuum compared to rotary vane pumps
• Measurably reduced backflow of oil due to oil-free pump chamber of roots pump
• Very high pumping speed from 12 to 40 m³/h, maximum between 0,2 and 100 mbar

The dry and oil-free compression and their good pumping speed, particularly in the pressure range between 0,2 and 50 mbar, allow the pumping of large amounts of vapors.

VARIO Roots pumping units use automatic, gas-load-dependent adjustment of the speed of the Roots pump resulting in high performance even at high inlet pressures and prevents overheating of the pump.

It is applied in distillations, drying processes and many other 'oil-free' applications such as load lock systems, electron microscopes, mass spectrometers and backing pumps for turbomolecular pumps and cryo pumps.