Filtration and Vacuum Specialists since 1976

The Micron
JB Systems Little Newspaper
Octobrer 2005
1334 Greenville Rd.
LaGrange, GA 30241
Filtration and Vacuum Specialists since 1976

Vacuum Pump Basics

A vacuum pump is a pump that removes gas to leave behind a partial vacuum (of varying quality, depending on the pump). Various mechanisms can be used; sometimes more than one will be used (in series or in parallel) in a single application.

A partial vacuum can be created using a positive displacement pump that transports a gas load from an inlet port to an outlet (exhaust) port. Because of their mechanical limitations, such pumps can only achieve a fairly crude partial vacuum. To achieve a more-perfect vacuum, other techniques must then be used (usually following an initial fast "pump down" using a positive displacement pump). In a turbomolecular pump, the momentum transfer principle is used, accelerating the gas molecules from the vacuum side to the exhaust side (which is usually maintained at a reduced pressure by a positive displacement pump). Another alternative is cryogenic entrapment where individual gas molecules are liquified and contained in a cold trap.

Achieving truly high vacuums is difficult because all of the materials exposed to the vacuum must be carefully evaluated for their outgassing properties. For example, oils, greases, rubber, or plastic used to form gaskets and seals must not boil off when exposed to the vacuum or the gases they produced would prevent the creation of the desired degree of vacuum. Often, all of the surfaces exposed to the vacuum must be baked at high temperature to drive off adsorbed gases.

Because of this you should consider the Heliot Helium Leak Detector as part of your process. Heliot goes where you go throughout your manufacturing facility, process environment, or laboratory. It's light weight, flexibility, and speed are well-suited for both production and research settings, and in both conventional and sniffer testing modes. In seconds, the conventional test mode is operable. The Heliot vacuum test port is securely connected to the test object. The Heliot system then pumps the air from the object and maintaines the resulting vacuum during the rest of the testing procedure. The outside surface of the object is sprayed with helium gas or placed in a chamber filled with helium. The vacuum draws helium through any flaw in the object, then into the Heliot, where it is detected by the spectrometer. The sniffer test mode is also operable in seconds. The test object is filled with helium gas and sealed. A pencil-shaped test probe is system activated. As the probe is passed over the object, the vacuum in the probe draws any helium leaking from the test object into the Heliot, where it is detected by the spectrometer, instantly.

Product Spotlight - Rietschle

Rietschle brand vacuum pumps offers a wide variety of pump for every pumping need. Standard products they carry are:
Visit our Rietschle pages to find more detailed information on these vacuum pumps and related products. Or if you would like personal attention with questions you might have please use our information request form.

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* As always we would like to thank the Wikipedia Encyclopedia for helping us with the simpliest form of definition for Vacuum Pumps.