AGILENT DIFFUSION PUMPS

AGILENT DIFFUSION PUMPS
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AGILENT DIFFUSION PUMPS

Product catalog summary
Features and Benefits
Agilent diffusion pumps are efficient in converting heat into pumping throughput, offering low ownership costs for high vacuum applications. Key features include high throughput per power unit, reduced cooling water needs, and durable construction. Agilent provides comprehensive service, training, and support, with options like Halo or custom baffles and Quick Cool Coil for specific applications. The pumps are designed for high pressure and gas flow conditions, with a robust boiler design ensuring stability and reliability.
Typical Applications
These pumps are used in high vacuum applications due to their reliability, simplicity, and cost-effectiveness. Suitable for vacuum furnaces, metallizing, large area coating, thin film deposition, and molecular beams, they handle high gas loads and variations, making them ideal for production environments. They offer high pumping speeds, throughput, forepressure tolerance, and low ultimate pressure, with excellent backstreaming characteristics.
Pump Models
The document details various pump models, including specifications like pumping speed, maximum throughput, compression ratio, operating range, and backstreaming rate. Models such as AX-65, HS-2, VHS-4, and others are listed with their respective technical specifications, including electrical requirements, power, and cooling water needs.
Fluids and Baffles
Agilent provides different fluids and baffles to optimize pump performance and minimize backstreaming. Information on Santovac 5 diffusion pump fluid and internal baffle kits is included.
Technical Notes
Technical notes cover descriptions of pumping speed and backstreaming measurements, as well as test methods for evaluating pump performance. The importance of selecting appropriate backing pumps and maintaining optimal operating conditions is emphasized to ensure efficient pump operation.
Technical Specifications
Detailed specifications for various diffusion pumps, including models VHS-400, HS-16, HS-20, HS-32, and NHS-35, are provided. Each model is described in terms of pumping speed, operating range, maximum throughput, and other critical parameters.
Ordering Information
Ordering information for each pump model is included, specifying voltage, weight, and part numbers. Accessories and replacement parts are also listed, with details on heaters, o-rings, and other components.
Notes and Recommendations
  • Pumps with ASA flanges include o-rings for inlet and foreline flanges, while ISO flanges do not include centering rings.
  • Not recommended for use with Santovac 5.
  • Export of these pumps may require licenses due to control by the Nuclear Suppliers Group.
Specifications and Components
The document details components such as cold cap nuts and followers, inlet and foreline flanges with specific dimensions and standards (ASA and ISO). It notes that ASA pump versions include o-rings for both inlet and foreline flanges, while ISO versions do not include a foreline flange centering ring. Export of the diffusion pump is controlled by the Nuclear Suppliers Group, requiring export licenses.
Fluids and Ordering Information
Various diffusion pump fluids are listed, including NEOVAC SY and Santovac 5, with specifications on chemical composition, ultimate pressure, vapor pressure, viscosity, and boiling temperature. NEOVAC SY is noted for its low cost and performance similar to DC-704, while Santovac 5 is recommended for ultrahigh vacuum applications.
Diffusion Pumps and Baffles
Technical specifications for diffusion pumps and baffles are provided, including materials, cooling methods, and ordering information. Extended Cold Caps and Halo Baffles are described, highlighting their efficiency in reducing backstreaming and maintaining pump speed.
Technical Notes and Applications
The history and operation of diffusion pumps are explained, including their principle of momentum transfer and the evolution of pumping fluids. Applications span various industries such as analytical instruments, coating, electron tube manufacture, and semiconductor manufacture.
Performance Factors and Operation
Key performance factors include pumping speed, maximum throughput, tolerable forepressure, and backstreaming rate. The operation of diffusion pumps involves heating a motive fluid to create vapor jets that transfer momentum to gas molecules.
Design Features and Pumping Fluids
Agilent diffusion pumps feature ejector stages, insulated jet drip shields, and water-cooled cold caps to enhance performance and reduce backstreaming. Various pumping fluids are discussed, including phenyl ethers and silicone fluids, with recommendations based on application needs.
Speed Measurements
Speed values are measured according to ISO Standard 1608/1, with changes in testing methods resulting in different speed values compared to previous editions.
Specifications and Procedures
Diffusion pump curves are based on DC704 diffusion pump fluid and a standard cold cap. Speed curves are calculated by measuring speed at increasing gas throughput levels, ensuring steady state conditions. Different gases exhibit different speeds, calculated by dividing gas throughput by its partial pressure. Catalog speeds are typically for air.
Backstreaming Measurements
Backstreaming is measured using a test dome configuration as per AVS Standard 4.5. Molecules crossing the pump inlet and condensing in the dome are considered backstreaming. Measurements are taken over several days until a steady rate is observed. The backstreaming rate is the average slope of the volume-time curve over a 72-hour period. Measurements are dependent on the test method, and results can vary significantly if different methods are used.
Using Baffles to Reduce Backstreaming
Baffles or traps are recommended if backstreaming is intolerable. Options include water-cooled halo baffles, optically dense baffles, or cryotraps. Baffles reduce backstreaming but also affect pumping speed. A water-cooled halo baffle reduces backstreaming by 90% and speed by 40%. Optically tight baffles intercept all primary backstreaming, with secondary rates determined by baffle temperature.
Estimating Baffle Effects on Pump Speed
The reduction in effective pumping speed due to a baffle depends on its conductance, which is influenced by geometry. Manufacturers provide conductance values or estimates of retained speed. Effective speed can be calculated using the formula: Seff = (Cbaffle * Spump) / (Cbaffle + Spump).
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Catalog excerpts

AGILENT DIFFUSION PUMPS-1

AGILENT DIFFUSION PUMPS Typical Applications Pump Models

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AGILENT DIFFUSION PUMPS-2

Diffusion Pumps Features and Benefits Agilent has earned its position as the leading diffusion pump manufacturer in the world by listening to customer needs and by continuously improving the performance and reliability of our benchmark designs. Throughout our more than forty years of leadership in the industry, we have consistently produced pumps that provide the most efficient means of converting heat into pumping throughput. Our experience has allowed us to optimize the design of every element of the pump. As a result, Agilent diffusion pumps offer you the lowest cost of ownership available...

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AGILENT DIFFUSION PUMPS-3

Diffusion Pumps DIFFUSION Pumps Built for Production Volumes Our success is in helping you meet the exacting requirements of your production process. Our pumps deliver superior pumping at high pressure and high gas flow conditions, and handle gas load variations that are typical of large volume production. Easy to Maintain Maintaining uptime is critical so we have simplified operation and maintenance. A sight glass provides visual indication of status when cold or hot and under vacuum. A gauge port facilitates system troubleshooting. Robust Boiler Design Through optimized boiler design, Agilent...

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AGILENT DIFFUSION PUMPS-4

Typical Applications Courtesy of Mill Lane Engineering Courtesy of Materials Research Furnaces, Inc. As the worldwide diffusion pump market leader, Agilent produces the most comprehensive family of pumps, ranging from 2 in. to 35 in. in diameter, and is the only broad-line, U.S.-based manufacturer. Diffusion pumps are in wide use because they have several advantages: They are reliable, simple in design, operate without noise or vibration, and are relatively inexpensive to operate and maintain. In fact, diffusion pumping is still the most economical means of creating high-vacuum environments....

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AGILENT DIFFUSION PUMPS-5

Diffusion Pumps DIFFUSION Pumps Vacuum Furnaces for large area coating systems. The large pumps used in this application come equipped with sight glass and drain assemblies and are also available with ASA or ISO flanges. Vacuum furnace applications require pumps that are capable of achieving stable pressures in high gas flow environments. Additionally, furnace operators need shorter cycle times to accomplish efficient processing of heat-treated material batches. Coatings (Optical, Electronics, Protective) With low ultimate pressure, high speed, high throughput and high tolerable forepressure,...

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AGILENT DIFFUSION PUMPS-6

Maximum forepressure, Torr (mbar) No load Full load Maximum throughput, T-l/s (mbar-l/s) In operating range @ 1 x 10-2 Torr (1.3 x 10-2 mbar) Warmup time, minutes Cooldown time, minutes with quick cool coil, where applicable Previous model number Pumping speed*, l/s (operating range) Air Helium & hydrogen Pumping speed AVS 4.1 (1963)* Minimum recommended backing pump for maximum throughput, cfm (m3/hr) Backstreaming rate at inlet flange mg/cm2/min (standard cold cap)* Fluid charge Electrical requirements Power, watts Cooling water, U.S. gpm (l/hr) at 60-80 °F (15-26 °C) *For descriptions of pumping...

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AGILENT DIFFUSION PUMPS-8

Pump Models Dimensions: inches (millimeters) Technical Specifications Pumping speed*, operating range 65 l/sec air, 90 l/s He and H2 Maximum throughput 0.19T-l/s (0.25 mbar-l/s) in operating range, 0.30T-l/s (0.40 mbar-l/s) @ 0.01 Torr Compression ratio 4 x 107 (air), 2 x 106 (helium) Operating range 3 x 10-3 to <5 x 10-8 Torr (3.9 x 10-3 to 6.5 x 10-8 mbar) Maximum forepressure load: 0.75 Torr (1.00 mbar) No Full load: 0.60 Torr (0.78 mbar) Backstreaming rate** With cold cap: <2 x 10-4 mg/cm2/min With baffle: <2 x 10-5 mg/cm2/min Recommended backing pump ≥1.5 cfm (2.5 m3/hr) Warmup time 7 minutes...

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AGILENT DIFFUSION PUMPS-9

DIFFUSION Pumps AX-65 - Pumping Speed - Air/N2 0.75 0.60 Throughput (Torr-l/sec) Inlet pressure (Torr) Pumping speed/Halo baffle Diffusion Pumps Ordering Information Description Wt. kg (lbs) Part Number KF-50 ISO-6 AX-65 with standard cold cap, 3.6 (8.0) L9670301 L9707301   115 V, 250 W AX-65 with internal baffle, 3.6 (8.0) L9670311 L9707311   115 V, 250 W AX-65 with standard cold cap, 3.6 (8.0) L9670302 L9707302   220 V, 250 W AX-65 with internal baffle, 3.6 (8.0) L9670312 L9707312   220 V, 250 W AX-65 with standard cold cap, 3.6 (8.0) L9670303 L9707303   115 V, 200 W AX-65 with internal baffle,...

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AGILENT DIFFUSION PUMPS-10

Pump Models Dimensions: inches (millimeters) Technical Specifications Pumping speed, operating range 160 l/s air, 200 l/s He and H2 Pumping speed*, AVS 4.1 (1963) 285 l/s air Maximum throughput 0.60 T-l/s (0.80 mbar-l/s) in operating range, 0.70 T-l/s (0.93 mbar-l/s) @ 0.01 Torr Operating range 3.7 x 10-3 to < 5 x 10-8 Torr, (4.9 x 10-3 to < 6.5 10-8 mbar) Maximum forepressure load: 0.55 Torr (0.71 mbar) No Full load: 0.40 Torr (0.52 mbar) Recommended backing pump ≥ 5 cfm (8.5 m3/hr) Backstreaming rate**, standard cold cap < 1 x 10-3 mg/cm2/min Warmup time 15 minutes Cooldown time 10 minutes...

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AGILENT DIFFUSION PUMPS-11

DIFFUSION Pumps HS-2 Pumping Speed - Air/N2 Throughput (Torr-l/sec) Inlet pressure (Torr) Diffusion Pumps Pumping speed Ordering Information Description With standard cold cap, 120 V 20.0 (9.0) With standard cold cap, 240 V 20.0 (9.0) Replacement Parts (one heater required per pump) 350 W, 120 V heater (HS2A) 1.0 (0.5) 350 W, 240 V heater (HS2A) 1.0 (0.5) 450 W, 120 V heater 1.0 (0.5) 450 W, 240 V heater 1.0 (0.5) Heater block (one required per pump) 1.0 (0.5) Heater platen (one required per pump) 1.0 (0.5) Replacement o-ring kit, (5 Inlet flange 1.0 (0.5)   o-rings (butyl 2-338)) Description...

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AGILENT DIFFUSION PUMPS-12

Pump Models Dimensions: inches (millimeters) Technical Specifications Pumping speed*, operating range 750 l/s air, 940 l/s He/H2 Pumping speed*, AVS 4.1 (1963) 1,200 l/s air Maximum throughput 1.5 T-l/s (2.0 mbar-l/s) in operating range, 2.5 T-l/s (3.2 mbar-l/s) @ 0.01 Torr Operating range 2 x 10-3 to <5 x 10-9 Torr (2.7 x 10-3 to <6.5 x 10-9 mbar) Maximum forepressure load: 0.65 Torr (0.86 mbar) No Full load: 0.55 Torr (0.73 mbar) Recommended backing pump ≥10 cfm (17 m3/hr) Backstreaming rate**, standard cold cap <5 x 10-4 mg/cm2/min Warmup time 10 minutes Cooldown time 10 minutes (with quick...

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