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Categories of exhibits

Diffusion Pump Edwards

Exhibit no. 166


It is important that the ions have a free run through the mass spectrometer without hitting air molecules. To achieve this, a vacuum must be generated in the instruments. The vacuum systems of many mass spectrometers consist of a differentially pumped system with a foreline pump establishing a rough vacuum and a high vacuum pump. The high vacuum can be created and maintained by diffusion pumps. Diffusion pumps operate by boiling fluid and forcing the dense vapor stream through central jets angled downward to give a conical curtain of vapor. Gas molecules that randomly enter the pump inlet are pushed toward the boiler and the pump walls by momentum transfer from the more massive fluid molecules. At the air- or water-cooled pump walls, the working fluid condenses and returns under gravity flow downward into the boiler.

The exhibit is air-cooled diffusion pump EO50/60 (Edwards) with a cutout that allows you to see the internal configuration. It is a low-cost, rapid warm-up pump with removable jet assembly for easy cleaning. Depending on the working fluid, the pump provides ultimate pressure in 10-6 to 10-7 mbar range. This exhibit served in quadrupole HP 5972 SERIES mass spectrometry detector (GC/EI-MS) manufactured by Hewlett-Packard in 1993.

Wikipedia: Diffusion pump


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