GEC Machines BS2508 Oil-Free Diaphragm Vacuum Pressure Pump 105/115V 1425 RPM

GEC Machines BS2508 Oil-Free Diaphragm Vacuum Pressure Pump 105/115V 1425 RPM

The GEC Machines BS2508 is a single-phase oil-free (oilless) diaphragm pump capable of both vacuum and pressure operation. Built by GEC Machines Ltd.'s FHP Motor Division in Newcastle, Staffordshire, England, it uses a diaphragm mechanism that requires no oil lubrication, making it well suited for applications where contamination from pump oil must be avoided. The motor is rated for continuous duty at 1425 RPM.

Specifications & What's Included

• Manufacturer: GEC Machines Ltd. (FHP Motor Division, Newcastle, Staffs, England — Made in UK)
• Model: BS2508
• Type designation: D/416-2e
• Standards reference: TDN 7174 / BS5000-11
• Voltage: 105/115V AC
• Frequency: 50 Hz
• Current: 9.5 A
• Power: 370 W
• Speed: 1425 RPM
• Duty rating: Continuous (CONT)
• Phase: Single phase
• Insulation class: F
• Frame: BS Frame
• Pump type: Oil-free / oilless diaphragm
• Operation: Vacuum and pressure
• Tested vacuum capability: 18 inches of mercury (Hg) at approximately 12 ft elevation
• Mounting: Shock-mounted base plate
• Head: Stainless steel domed diaphragm head with two compression fittings and needle valves
• Cooling: Integral fan on motor end

Applications

Oil-free diaphragm pumps like the BS2508 are used across laboratory and light industrial settings where a clean, oil-free vacuum or low-pressure source is needed. Common applications include filtration and aspiration in chemistry and biology labs, vacuum desiccators, rotary evaporators, degassing, and low-pressure process lines where pump-oil vapor would contaminate the process or sample. Because the diaphragm isolates the pumped gas from all lubricated parts, these pumps handle corrosive vapors and humid gas streams better than oil-sealed rotary vane pumps. The BS2508 dates from the era of British-made FHP (fractional horsepower) motor-driven lab pumps — a category GEC Machines supplied extensively to UK universities, research institutions, and industrial labs from the mid-20th century onward. Units like this continue to see active use in lab environments where a compact, continuous-duty, oilless source of moderate vacuum (up to roughly 20–25 in Hg for similar designs at sea level) is required without the maintenance overhead of an oil-sealed pump.