As discussed in our article covering the difference between hydrocarbon based and silicone based diffusion pump oil, we generally recommend our customers use silicone based diffusion pump oil. While expensive, silicone oil will perform well over long periods of time with little to no. Oil vapor diffusion pumps it wasnt that long ago when you could walk into any vacuum laboratory and find a vapor diffusion pump on every system. After completing the pump, it was attached to a mechanical forepump, cold traps, a manifold and vacuum gauges. It has an advantage of selfcleaning, high volume flow rates. Oil diffusion pump systems, dp complete, ready to use pumping system with a pillar design, for the production of high vacuum using oil diffusion principles. The larger capacity pumps pbl06 pbl20 have the heaters directly immersed in the operating fluid for maximum thermal efficiency. This process takes place as a result of the fact that gases resist diffusion in the vapor stream and are more inclined to move along with it. Does the cryotrap above the diffusion pump contain liquid nitrogen. Santovac 5 polyphenyl ether lion s diffusion pump oil properties of pfeiffer p3 pumping fluid. The oil diffusion pumps are vibrationfree, reliable, and less expensive, while they may introduce contamination because of oil vapor. Handbook for proper maintenance and use of the high vacuum system v 1. Although its use has been mainly associated within the highvacuum range down to 10.
When your process requires a pressure below that of a mechanical pump or mechanical pump and roots pump combination a. At the bottom, you can see the heaters that sit just below the oil. Backstreaming of oil vapor in oil diffusion vacuum pumps. To replace mercury, hydrocarbon oils were used as the working fluid. Vhs4 diffusion pump x draft 8702 explosion operation of the diffusion pump without continuous evacuation below 0. Is the water turned on, to condense the oil inside of the diffusion pump. The working principle of oil diffusion pump is similar to that of water vapor injection pump, both of which carry gas by high speed steam jet to achieve the purpose of air extraction.
Acetone, alcohol, and most other solvents are irritants, narcotics, and depressants, andor carcinogenic. The oil diffusion pump is operated with an oil of low vapor pressure. Agilent diffusion pumps offer high pumping speeds, high throughput, high tolerance forepressure, excellent backstreaming characteristics, low ultimate pressure, and longterm reliability. Vapor diffusion pumps were first conceived about 191516, and used mercury as the pumping fluid. Even absorption through the skin can result in moderate toxicity. Silicone based diffusion pump oil 1 gallon, same as dc705. Vapor pressure as figure 1 shows, dow corning 705 diffusion pump fluid has extremely low vapor pressure. Oil diffusion pumps remain in popular use in the vacuum heat treating industry, possibly one of the few applications remaining for this type of high vacuum pump in the western world. The 21% or so of oxygen in the air causes the hot oil vapor to turn to a tarry deposit which contaminates the jet assembly inside the diffusion pump body and makes the pump performance unstable. Use and maintenance of oil diffusion pump vacuum pump. It is very reliable and longlived, although when misused it can create a great deal of contamination in the processing chamber. This article will explain practical steps that can be taken to ensure optimal performance of. Modern turbomoleculars use magnetic bearings, so the diffusion pumps reliability advantage has disappeared.
A vacuum diffusion pump cannot begin its work with full. Product categories fomblin greases and fluids archive. Typically there are three jet assemblies of diminishing sizes, with the largest at the bottom. Diffusion pumps are typically cleaned with acetone or alcohol. Relevant identified uses of the substance or mixture and uses advised against. We specialize in offering high quality silicone diffusion pump oil backed by worldclass technical and customer support. Diffusion pump maintenance guide diffusion pump oil by. On the pumping speed of oil diffusion pumps springerlink. Oil diffusion ejector pumpy pbl series ulvacs oil diffusion pump has been used for many high vacuum equipments. In more critical applications, an opticallydense baffle is typically pro vided to deflect particles before they can reach the process stream. A vacuum diffusion pump is basically a stainless steel chamber containing vertically stacked coneshaped jet assemblies. As the worldwide diffusion pump market leader, agilent produces the most comprehensive family of pumps, ranging from 2 in.
Silicone based diffusion pump oil 500 cc, same as dc704. The measurements of the jet breakdown pressure of an oil diffusion pump have been taken in respect of the heat input, and those of the pumping speeds have been taken both in relation to heat input and forepressure, both for air and for hydrogen. We meet customers needs with various lineup including 4 to 52 inch for oil diffusion pump and 2 to 20 inch for oil diffusion ejector pump. Thus a vacuum diffusion pump achieving a vacuum of 103 torr may also be said to have reached a vacuum of 1 micron. Leybonol lvo 521 is our new highpurity, highquality silicone oil solution for your diffusion pump. The ulvac diffusion pumps have been designed for outstanding performance and extremely low running costs.
Oil diffusion pumps in toshinwal are available in nominal sizes. Oil diffusion pumps are still the most popular type of highvacuum pump because they are relatively inexpensive, highly reliable and very durable. Speed of oil diffusion pump do8001 with baffle and cod trap, pumping air 14 at the tate im d2, where mis the molecular weight. High throughput diffusion pumps draft 122304 diffusion pump hazards designers of systems utilizing diffusion pumps must design out hazards wherever possible.
Lion diffusion pump oil lion a lion s lion s products, china trading company. Physics and engineering of high and very high vacuum, leningrad 1985, p. Diffusion pump fluids, vacuum fluids, vacuum greases, hydrocarbon oil, silicone oil, semi synthetic hydrocarbon oil, cambridge mills cmp 20 oil, diffusion pump. The main reasons for their continued use are their longevity the lack of other options. The oildiffusion pumps can reach a vacuum of 500 ls. High efficient vacuum pumps from leybold, best suited for industrial high vacuum applications. High vacuum pump, diffusion pump, oil diffusion pumps. A diffusion pump is a device designed to pump gases with a high speed vapor jet as a transport medium. Because of its simplicity, high performance and low initial cost, the diffusion pump is the primary industrial high vacuum pumping mechanism. Information about dow corning diffusion pump fluid dow. Performance of lion diffusion pump oil 11 corelationship between ultimate pressure temperature 1 pressure temperature relationship of lion diffusion pump oil a method. Today, the use of mercury in diffusion pumps is essentially zero.
The vacuum tank was pumped by a 6in oil diffusion pump, equipped with a liquid nitrogen trap, chevron baffle and butterfly valve. Other companies are charging thousands of dollars to set up accounts and give you access to their msds online database. A vacuum of 103 torr has removed a great many of the atmospheric molecules, but this is actually the level at which a vacuum diffusion pump begins to operate. Leybold is committed to protecting and respecting your privacy, and we will only use your personal information to administer your account and to provide the products and services you requested from us. An oil diffusion pump is used to achieve higher vacuum lower pressure than is possible by use of positive displacement pumps alone. All systems comprise oil diffusion pump, rotary vane backing pump, backing pressure gauge pia 1. To ensure the satisfaction of our customers, our products are rigorously tested to ensure it reaches or exceeds all advertised specifications. It made a successful debut in the teaching lab, providing a visual display of the inner workings of an oil diffusion pump. Diffusion pumps differ from conventional mechanical pumps in that they use a high speed jet of fluid to direct gas molecules in the pump throat down to the bottom of the pump and out the exhaust, which is usually called the foreline. Their inhalation and ingestion may produce serious effects.
Depending on the type of diffusion pump oil you use, maintenance can be relatively simple to very time consuming. The pumping speed ranges from 3,000 ls to 50,000 ls and has an operating pressure range of oil for diffusion pumps. Your new online msds binder is a place for you to store the material safety data sheets you need to deploy. In all diffusion pumps, a small amount of backstreaming, movement of oil molecules into the vacuum chamber, occurs. Lion diffusion pump oil lion a lion s lion s china. For hazards that cannot be designed out, warnings, procedures, and instructions on proper use and servicing are provided. Handbook for proper maintenance and use of the high. Using silicone based oil, there is little or no maintenance required, just several things. Since the chamber itself has no moving parts aside from the oil droplets, a vacuum.
Silicone based diffusion pump oil 100 cc, same as dc705. It is considered our most effective teaching aide in high vacuum principles and techniques. The most frequently used diffusion pump fluid used in the heat treating industry for the last thirty or more years is silicone oil. Varian, vhs4, vhs6, vhs250 diffusion pumps, instruction. Dow corning 704r diffusion pump fluid ecotoxicity classification criteria hazard parameters lc50 or ec50 high medium low acute aquatic toxicity mgl 1 and 100 acute terrestrial toxicity 100 and 2000 this table is adapted from environmental toxicology and risk assessment, astm stp 1179, p. Inland vacuums silicone diffusion pump oils invoil 702, 704, and 705 are durable fluids designed for a variety of high vacuum applications and for fast pumping large volumes of gas. In practice, to reduce specimen contamination, a diffusion pump oil of low vapor pressure should be employed. Please use guards, safety features, and interlocks as recommended. The oil diffusion ejector pump consists of a pump body, heater and 3stage jet stack assembly. Operation, maintenance and troubleshooting of oil diffusion pumps oil diffusion pumps are still the most popular type of highvacuum pump because they. As you might imagine, such a thing would be frowned upon today due to the toxicity of mercury vapors. These vapor jet pumps are one of the oldest and most reliable ways to create a vacuum.
When the oil view diffusion pump oil selection online becomes hot enough to vaporize, the oil vapors rise up the center of the pump and exit the nozzles at a downward angle. According to dayto 2 the tate of speeds for hydrogen and air for a pump may be various, depend. The diffusion pump is the most common type of pump for use in high vacuum applications. Maintenance and troubleshooting of oil diffusion pumps. Oil diffusion pumps most innovative design for best performance and efficiency.
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