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Edwards EH250 Industrial Blower

  • Edwards EH250
  • Edwards EH250
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Product Description

Edwards EH250 Industrial Blower

EH250 HC IE3 US 60HZ 230 / 460V 60HZ



The EH mechanical booster pump, based on the simple Roots principle, remains the favourite pump for applications where high pumping speeds are required for pressures in the region of 0.01 to 10 mbar. This pump must always be backed by another pump, which can deliver against a high-pressure differential to atmospheric pressure. 
Operating at relatively low pressures, the mechanical booster pump is not exposed to the same concentrations of corrosive process media as is the backing pump, which makes it highly reliable.


EH pumps with hydrokenetic drive 
EH booster pumps have a unique and patented hydrokinetic fluid drive, which couples the motor to the pumping mechanism. The hydrokinetic drive offers the following advantages:
  • Pump down times cut by up to 50 %
  • Reduced capital and operating costs
  • No pressure sensors, by-pass lines or valves 
  • Can operate continuously at all pressures when used with a backing pump 

EH booster pumps have universal voltage, air-cooled motors and are available with effective pumping speeds (at 50 Hz) of up to 3100 m3h-1. The pump bodies of the EH1200, EH2600 and EH4200 pumps are water-cooled. 
Pump-down times cut by up to 50% 
The hydrokinetic drive allows the booster pump to be started at the same time as the backing pump (at atmospheric pressure) as it prevents motor overload. The EH booster pump therefore assists the pumping process from the start of pump-down. In comparison pumping systems with conventional, direct drive mechanical booster pumps (where the booster pump is switched on when the chamber pressure has been reduced to, typically, less than 10 mbar), the total evacuation time can be reduced by as much as 50%. 
Automatic overload protection 
The hydrokinetic drive automatically varies the rotational speed of the pump. This protects the motor from overload, prevents over-heating, and allows the pump to operate with high-pressure differentials. Consequently, EH booster pumps are not damaged by sudden increases of inlet pressure and even by the entry of solid debris into the pump. 
Important cost savings 
When you use EH mechanical booster pumps, you save money on installation and operation. Your capital costs are reduced as you do not need valves, by-pass lines and pressure switches, and you can use a smaller backing pump than with conventional drive booster pumps. Operation costs are reduced because EH booster pumps have smaller motors than direct drive pumps and, when operating at full speed, they use only a fraction of the rated power.


  • Semiconductor processing
  • Vacuum distillation
  • Vacuum packaging
  • Steel de-gassing
  • Thin film coating
  • Vacuum metallurgy
  • Low density wind tunnels
  • Space simulation
  • Vacuum impregnation
  • Oil drying and de-gassing
  • Pharmaceutical freeze drying
  • CO2 lasers

    Features and Benefits

    • Suitable for applications where high pumping speeds over 3000 m3h-1/1776 ft3min-1 are required in the pressure region of 0.01 to 50 mbar/0.0075 to 37.5 Torr.
    • Operating at relatively low pressures makes it highly reliable.
    • The EH pumps have a high quality, oil-free pumping mechanism. This offers:
      • Quiet, vibration free operation.
      • ­Rugged and corrosion resistant.
      • ­Advanced shaft-seal technology with no oil contamination of the process chamber
    • The corrosion resistant pumping mechanism is manufactured from high grade cast iron.
    • The proven shaft-seal arrangement ensures that no oil enters the pumping stator, and the absence of internal and external by-pass lines and valves which may corrode or stick minimizes maintenance requirements.
    • The design of the shaft seals is optimized to ensure that no lubricants can migrate into the pumping mechanism. This maintains booster pump performance in applications which demand the highest standard of cleanliness. In addition, this prevents the build-up of trapped particles on the rotor lobes and end-faces which have very close tolerances.
    • The dynamically balanced rotors and precision ground gears contribute to the smooth, quiet operation of the pumps, as demanded by manufacturers of advanced technology equipment

      Technical Data

      Displacement (swept volume)  
       50Hz 310 m3h-1 / 185 ft3min-1
       60Hz 375 m3h-1 / 220 ft3min-1
      Effective pumping speed with backing pump  
       E1M40 or E2M40 240 m3h-1 / 141 ft3min-1
       E1M80 or E2M80 274 m3h-1 / 161 ft3min-1
      Pressure differential across pump  
       50Hz 0-180 mbar / 0-140 Torr
       60Hz 0-150 mbar / 0-115 Torr
      Inlet connection ISO63
      Outlet connection ISO40
      Rotational speed ‡  
        50Hz 0-2900 rpm
        60Hz 0-3500 rpm
      Operating continuous inlet pressure 0-1000 mbar / 0-760 Torr
      Maximum outlet pressure 1000 mbar / 760 Torr
      Recommended backing pumps GV80, E1M/E2M40, E1M/E2M80
      Electrical supply voltage, 3-ph  
       50Hz 220 – 240V / 380 – 415V
       60Hz 208-230V / 460V
      Motor power  
       Hydrocarbon 2.2 kW / 3 hp
       PFPE 1.5 kW / 2 hp
       ATEX 2.2 kW
       Explosion proof 3 hp
      Ambient temperature range  
       Operating 5 to 40°C / 40 to 104°F
       Storage -10 to 80°C / 14 to 176°F
      Maximum operating humidity 90% RH
      Recommended oil Ultragrade 20
      Oil capacity  
       Coupling cover 1.5 litre / 1.6 qt
       Shaft seal reservoir 0.125 litre / 0.25 qt
      Weight* 66 kg / 142 lb

      *Weight refers to IND version

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