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.
The EH1200FX pump is supplied for use with PFPE oil. This enables them to be used in harsh (corrosive) processes, or where the presence of Oxygen will result in rapid degradation of hydrocarbon oils. Fomblin® must be purchased separately for PFPE prepared pumps.
Edwards recommends that the EH1200FX pump should NOT run continuously on pressures >10 mbar.
|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|
|Operating continuous inlet pressure||0-1000 mbar / 0-760 Torr|
|Maximum outlet pressure||1000 mbar / 760 Torr|
|Recommended backing pumps||GXS160, GXS250, E2M80, E2M175, E2M275, ES200, ES300, ES630, 212J, 412J, IDX1000, IDX1300|
|Hydrocarbon||3kW / 4hp|
|PFPE||3kW / 4hp|
|Ambient temperature range|
|Operating||5 to 40°C / 40 to 104°F|
|Storage||-20 to 80°C / 14 to 176°F|
|Maximum operating humidity||90% RH|
|Recommended cooling water flow (inlet temperature 20°C)*||3 lmin-1|
|Recommended cooling water supply pressure*||2-6 barg|
|Cooling water connections*||3/8 inch BSP male|
|Standard version||Ultragrade 20|
|PFPE version||Fomblin® YVAC 16/6|
|Gear case||1.25 litre|
|Coupling cover||2.4 litre|
|Shaft seal reservoir||0.125 litre|