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.
The EH250FX 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 EH250FX pump should NOT run continuously on pressures >10 mbar.
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 | |
E2M40 | 240 m3h-1 / 141 ft3min-1 |
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, E2M40, E2M80, ES100, 212J |
Motor power | |
Hydrocarbon | 2.2 kW / 3 hp |
PFPE | 2.2 kW / 3 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 |
Shaft seal reservoir | 0.125 litre |
Weight | 75 kg |