The Edwards E2S12 is a two-stage oil-sealed pump for suitable laboratory, equipment and general vacuum duties. The documented 50 Hz version provides 12 m³/h effective pumping speed, with gas ballast for water vapour within its specified limits.
Edwards manufacturer image showing E2S12 at the rear and E2S5 in front. Select the electrical version for the installation.
Part of the Edwards E2S5 and E2S12 two-stage rotary vane pumps family. Compare the range and other model options.
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View quote listThe Edwards E2S12 is a two-stage oil-sealed pump for suitable laboratory, equipment and general vacuum duties. The documented 50 Hz version provides 12 m³/h effective pumping speed, with gas ballast for water vapour within its specified limits.
| Specification | Details |
|---|---|
| Effective pumping speed | 12 m³/h, documented 50 Hz version |
| Nominal pumping speed | 14.2 m³/h, documented 50 Hz version |
| Ultimate total pressure | 0.002 mbar without gas ballast |
| Inlet / exhaust | KF25 / KF25 |
| Electrical supply | Single-phase 220–230 V, 50 Hz; three-phase version separately specified |
| Motor rating | 0.37 kW at 50 Hz, single- or three-phase |
| Ultimate pressure, GB1 / GB2 | 0.03 / 0.06 mbar |
| Water-vapour capacity, GB1 / GB2 | 0.04 / 0.25 kg/h |
| Water-vapour tolerance, GB1 / GB2 | 5 / 28 mbar |
| Oil volume | 0.75–1 litres |
| Dimensions, single-phase | 529 × 174 × 272 mm (L × W × H) |
| Dimensions, three-phase | 501 × 158 × 272 mm (L × W × H) |
| Ambient operation | 10–40 °C; confirm installation conditions |
| Equipment condition | New equipment, configured by quotation |
Effective pumping speed and nominal displacement are different figures. Use 12 m³/h when comparing the documented effective performance. Chamber pump-down depends on gas load, pipework and the pressure-speed curve; the end-pressure figure does not describe capacity at every inlet pressure.
| Specification | Details |
|---|---|
| A67501912 | 220–230 V, single-phase, 50 Hz |
| A67522935 | 220–230/380–400 V, three-phase, 50 Hz as stated in ordering Table 6; confirm motor nameplate |
Table 6 of the January 2026 manual lists these 50 Hz builds. Its electrical table uses narrower voltage labels for the three-phase motors, so confirm the exact motor nameplate and connection with the quotation. Do not assume a 60 Hz version or apply a general speed conversion to an unverified build. Ask Girovac to confirm the UK mains lead or wiring arrangement and what is supplied.
Two gas-ballast settings provide different ultimate-pressure and water-vapour capacities. The standard pump is not specified for corrosive, toxic, pyrophoric or other hazardous gases, oxygen enrichment, liquid pumping or large dust loads. Describe the gas and vapour composition so suitable inlet protection and an appropriate pump can be selected.
Specify inlet filtration, liquid separation where needed, exhaust routing and controls for the process. The manufacturer lists additional gas-ballast and maintenance components separately; they are not all included in the base pump. Keep ventilation openings clear and provide access to the oil level, filling and drain points. Follow the recommended lubricant and the schedule for the supplied serial number.
E2S5/12 operating instructions, 301337894_A, January 2026 (PDF)
Source: technical data and drawings pages 18–25; process and installation requirements pages 29–33. The model-level page covers configuration choices and does not have a single manufacturer part number.
Explore the E2S 5/12 family and Edwards brand guide. Compare vacuum gauges and controllers, plan gauge calibration, or discuss servicing.
For Edwards E2S12 Two-Stage Rotary Vane Vacuum Pump, include working pressure, required flow or chamber volume, gas and vapour load, operating hours, electrical supply and connections. For a replacement, send the complete nameplate and serial number so the configuration can be checked.
| Manufacturer | EDWARDS |
|---|---|
| Equipment type | Two Stage Rotary Pumps |
| Electrical supply | Single-phase 220–230 V, 50 Hz; three-phase version separately specified |
| Effective pumping speed | 12 m³/h, documented 50 Hz version |
| Nominal pumping speed | 14.2 m³/h, documented 50 Hz version |
| Ultimate total pressure | 0.002 mbar without gas ballast |
| Inlet / exhaust | KF25 / KF25 |
| Motor rating | 0.37 kW at 50 Hz, single- or three-phase |
| Ultimate pressure, GB1 / GB2 | 0.03 / 0.06 mbar |
| Water-vapour capacity, GB1 / GB2 | 0.04 / 0.25 kg/h |
| Water-vapour tolerance, GB1 / GB2 | 5 / 28 mbar |
| Oil volume | 0.75–1 litres |
| Dimensions, single-phase | 529 × 174 × 272 mm (L × W × H) |
| Dimensions, three-phase | 501 × 158 × 272 mm (L × W × H) |
| Ambient operation | 10–40 °C; confirm installation conditions |
| Equipment condition | New equipment, configured by quotation |
Send the pump model and part number when asking about a replacement. Compatibility depends on the equipment and operating conditions.
Confirm the exact version, electrical supply and connections. Ask whether oil, filters, fittings, cables or controllers are included or separately specified.
Availability, lead time and the applicable warranty are confirmed for your quotation. A catalogue listing does not reserve stock.
What to check in your quotation · Delivery · Returns and faults
Edwards E2S12 Two-Stage Rotary Vane Vacuum Pump
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Compare the stated conditions as well as the values. A missing specification is not a zero rating; confirm suitability with Girovac.
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