ATEX pumps are certified for use within potentially explosive atmospheres.

The EH1200T160 mechanical booster pump has been certified for use in EX II 2G c IIB T160 classified areas. The temperature classification of the mechanical booster pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.

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.

ATEX EH mechanical booster pumps may be supplied with ATEX classification either as part of a pump system or stand-alone, on application.


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.


  • 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
Dane techniczne
Displacement (swept volume)  
  50Hz 1195 m3h-1 / 715 ft3min-1
  60Hz 1435 m3h-1 / 845 ft3min-1
Effective pumping speed with backing pump  
  E2M80 840 m3h-1 / 495 ft3min-1
   E2M175 930 m3h-1 / 548 ft3min-1
   E2M275 1020 m3h-1 / 601 ft3min-1
Pressure differential across pump †  
  50Hz 0-90 mbar / 0-68 Torr
  60Hz 0-75 mbar / 0-56 Torr
Inlet connection ISO160
Outlet connection ISO100
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 GV160, GV250, E2M80, E2M175
Electrical supply  
  50Hz 220-240V / 380-415V
  60Hz 208-230V / 460V
Motor power  
  Hydrocarbon 3kW / 4hp
  PFPE 3kW / 4hp
  ATEX 3kW
  Explosion proof 4hp
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 cooling water flow (inlet temperature 20°C)* 120lh-1 / 0.53 gal min-1
Recommended cooling water supply pressure* 2-6 bar
Cooling water connections* 3/8 inch BSP male
Recommended oil  
  Standard version Ultragrade 20
  PFPE version Fomblin® YVAC 16/6
Oil capacity  
  Gear case 1.25 litre / 1.3 qt
  Coupling cover 1.5 litre / 1.6 qt
  Shaft seal reservoir 0.125 litre / 0.25 qt
Weight** 149 kg / 327.8 lb

* Under many circumstances, pumps may operate without cooling water.
** Weight refers to IND version
†. Depends on pressure

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