Edwards 80V DC Turbomolecular Vacuum Pump

The Edwards EXT255H is a high-performance, compound turbomolecular pump designed to provide reliable, hydrocarbon-free high vacuum for demanding scientific and industrial applications. Featuring a sophisticated permanent magnet bearing at the high-vacuum end and a ceramic oil-lubricated bearing at the exhaust end, this pump ensures stable operation and long service intervals. The "H" version is specifically optimized for high compression ratios, making it exceptionally effective at pumping light gases such as Hydrogen and Helium.

Technical Performance and Design

• High Compression Technology: The EXT255H utilizes a specialized blade geometry and a Holweck drag stage to achieve superior compression ratios, allowing for higher foreline pressure tolerance and deeper ultimate vacuum.

• Hybrid Bearing System: Combines a maintenance-free magnetic bearing with a high-precision ceramic mechanical bearing to minimize vibration and maximize the operational life of the pump.

• High-Purity Vacuum: Provides a completely dry, oil-free vacuum environment on the high-vacuum side, which is critical for mass spectrometry, electron microscopy, and thin-film deposition.

• Flexible Mounting: Designed to operate in any orientation from vertical to horizontal, allowing for easy integration into compact or complex vacuum system manifolds.

Product Specifications

• Model: EXT255H

• Inlet Flange: Typically available in ISO100 or CF100 configurations

• Pumping Speed (Nitrogen): Approximately 220 Liters per second

• Ultimate Vacuum: < 5 x 10⁻⁹ mbar (with suitable backing pump)

• Operating Voltage: 80V DC (Requires compatible Edwards EXC or TIC Controller)

• Rotational Speed: 60,000 RPM

• Cooling: Available in both Air-cooled and Water-cooled configurations

Operational Advantages

• Optimized Light Gas Performance: The high compression design makes this model the preferred choice for applications involving significant loads of Helium or Hydrogen.

• Enhanced System Stability: The low-vibration signature of the hybrid bearing system protects sensitive analytical instruments from mechanical interference.

• Robust Foreline Tolerance: The integrated drag stage allows the pump to operate with smaller backing pumps or at higher backing pressures without compromising performance.

• Proven Reliability: The EXT series is a global industry standard, known for its rugged construction and ease of serviceability in both research and production environments.

Removed from a fully operational machine, excellent condition.