HS-20 Oil Diffusion Pump - Data Sheet

Importance of the Topic

This summary focuses on the Agilent HS-20 oil diffusion pump, a critical component in advanced vacuum systems. High-throughput diffusion pumps enable efficient low-pressure environments essential for industrial processes such as vacuum furnaces, heat treatment, metallization, coating of optical lenses, electronics fabrication, and protective film deposition.

Objectives and Overview

The primary goal of the HS-20 data sheet is to present the pump’s performance specifications, mechanical design, and recommended operating parameters. It highlights the pump’s optimized vapor jet design, robust boiler assembly, thermal protection features, and maintenance-free operation over extended periods.

Methodology and Instrumentation

The HS-20 system was characterized under standard test conditions using DC-704 pump fluid. Key elements include:

• Diffusion Pump Design: Fully optimized vapor jet and robust boiler for stable high-speed operation.
• Cold Cap Options: Standard cold cap and water-cooled halo baffle to reduce backstreaming.
• Backing Pump Recommendation: Minimum 100 cfm (170 m³/h) rotary vane pump (e.g., DS202) to maintain proper foreline pressure.
• Fluid and Thermal Management: Use of DC-704 or equivalent fluid, 45-minute warm-up and 85-minute cooldown, thermal protection switches at boiler and water jacket.
• Electrical and Cooling Requirements: Three-phase power (240/415/480 VAC), 12 kW heater capacity, and 1.5 gpm cooling water at 15–26 °C.

Main Results and Discussion

Performance parameters measured include:

• Pumping Speed: 10 000 L/s for air (12 500 L/s for He and H₂), 17 500 L/s by AVS 4.1 standard tests.
• Throughput: Up to 18 Torr·L/s at 0.01 Torr inlet pressure, 12.5 Torr·L/s in normal operating range.
• Operating Range: From 1.3×10⁻³ to 5×10⁻⁸ Torr (0.85 to 6.5×10⁻⁸ mbar).
• Backstreaming Rate: Below 1.5×10⁻³ mg/cm²·min with standard cold cap.
• Cycling Times: Warm-up in 45 min; cooldown in 85 min.

The data show consistent high-speed evacuation with minimal contamination risk and reliable thermal stability thanks to integrated switches.

Benefits and Practical Applications

The HS-20 diffusion pump offers:

• High throughput and rapid evacuation for large vacuum chambers.
• Low maintenance operation due to robust mechanical design.
• Flexible inlet flange options (20 in. ASA or DN 630 ISO-K) for integration into diverse vacuum systems.
• Applications across metallurgical processing, semiconductor fabrication, optical coatings, and surface treatment industries.

Future Trends and Opportunities

Emerging directions for diffusion pump technology include:

• Advanced materials for lower backstreaming and extended fluid life.
• Integration with smart sensors for real-time monitoring of temperature, pressure, and fluid condition.
• Enhanced automation and digital control interfaces for predictive maintenance.
• Compatibility with alternative low-vapor-pressure fluids and environmentally friendly lubricants.

Conclusion

The Agilent HS-20 oil diffusion pump represents a high-performance, durable solution for demanding vacuum applications. Its optimized vapor jet architecture, thermal safeguards, and flexible flange configurations make it a versatile choice for industrial and research environments.

Reference

• Agilent Technologies. HS-20 Oil Diffusion Pump Data Sheet, November 17, 2023.