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Featured Analytical Instrument

NEW Edwards nXDS6i Dry Vacuum Pump

NEW Edwards nXDS6i Dry Vacuum Pump

The Edwards nXDS6i is the next generation in completely oil free, dry scroll pumps; it replaces the discontinued XDS5.

The nXDS series of pumps improves on legacy XDS pumps by offering increased pumping speeds, combined with lower ultimate pressures, lower power consumption and lower noise. Gas ballast allows for pumping of condensable vapors including, water, solvents, dilute acids and bases. nXDS pumps also feature the latest in tip seal technology giving significantly longer life between tip seal changes. Integrated inverter drive with auto sensing voltage input delivers optimizedpumping performance globally. nXDS pumps are designed to be completely field serviceable.

How it Works...

Dry Scroll pumps create vacuum by using two open spiral scrolls that are nested together. One scroll is fixed while the other "orbits" about the center of the fixed scroll. As the moving scroll orbits, crescent-shaped gas volumes are formed. The orbiting scroll causes the trapped volume of gas to decrease and compress until it reaches a minimum volume and maximum pressure at the center of the spirals where the gas is exhaust. The ultimate vacuum of most scroll pumps is ~10-3 Torr. Pumping speeds range from 1-50 cfm for normal commercial pumps. Scroll pumps are used in clean, dry processes and as dry backing pumps for high vacuum pumps.

Technical Data

Nominal rotational speed 1800 rpm
Displacement 6.8 m3h-1  /  4.0 ft3min-1
Peak pumping speed 6.2 m3h-1  /  3.6 ft3min-1
Ultimate vacuum (total pressure) 0.020 mbar  /  0.015 Torr
Minimum standby rotational speed 1200 rpm
Speed control resolution (percentage of full rotation speed) 1%
Pumping speed at minimum rotational speed 4.1
Maximum continuous inlet pressure 200 mbar
Motor power 1-ph 260 W
Power connector 1-ph IEC EN60320 C13
Recommended fuse 10A, 250Vac rms
Weight 26.2 kg  /  58 lb
Inlet flange NW25
Exhaust flange NW25
Noise level 52 dB(A)
Vibration at inlet flange < 4.5 mms-1   (rms)
Leak tightness (static) < 1x10-6 mbar ls-1
Operating temperature range 10 to 40 °C  /  41 to 104 °F


  • General clean pumping applications
  • Scanning Electron Microscopes - SEM
  • Beam lines and high energy physics
  • Backing turbo pumps
  • Centrifuges, ultra-high speed
  • Coating
  • Cryogenics
  • Degassing/curing - oil, epoxy resin
  • Distillation/extraction/filtration
  • Freeze drying
  • Furnaces
  • Gel drying
  • Laboratory bench top vacuum
  • Lasers, gas recovery and recirculation
  • Leak detectors, Helium
  • Load locks and transfer chambers
  • Rare gas recirculation
  • Rare gas recovery
  • Refrigeration manufacture
  • Research and development
  • Rotary, centrifugal evaporators
  • SEM/FIB (ion beam repair)
  • Solvent recovery
  • Surface science instruments