Edwards Turbomolecular Pump Model EXT250H

The Edwards Turbomolecular Pump Model EXT250H is a compound vacuum pumps that combine a turbomolecular pump and a drag pump on a single shaft.

Specifications:

• Inlet-flange: DN100ISO-K/ DN100CF
• Outlet-flange: DN25NW
• Vent-port: 0.125″ BSP 
• Purge-port: 0.125″ BSP
• Inlet Pumping Speed:
  • N2: 220 l s^-1
  • He: 230 l s^-1
  • H2: 180 l s^-1
• Inlet Compression Ratio:
  • N2: > 2 x 107
  • He: > 1.6 x 104
  • H2: 1500
• Ultimate Pressure:
  • < 5 x 10^-9 mbar
  • < 5 x 10^-7 Pa
• Minimum Backing Pump Displacement: 0.6 m^3h^-1
• Maximum Continuous Inlet Pressure:
  • Water-Cooling at 15°C: 3 x 10^-1 mbar, 30 Pa
  • Air-Cooling at 35°C: 3 x 10^-2 mbar, 3 Pa
• Recommended Backing Pump: RV3
• Dimensions: 5.98″ Dia. x 7.51″ H (15.2 cm x 19.08 cm)
• Weight: 17.64 lbs (8 kg)