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Forums
Engineering
Materials and Chemical Engineering
Molecular Seive for making vacuum tubes
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[QUOTE="Y2keddie, post: 6142886, member: 658234"] im trying to jog my memory back 30years when I worked with vacuum tubes. I worked with manufacturing of image tubes. I remember the vacuum systems used vac-ion pumps to achieve -12 power torr. I alsoo remember first using a molecular seive for roughing,pumping to 10 microns. The seive was a canister filled with a zeonolite which was cooled with liquid nitrogen. I believe it worked as an adosorbtion process where water molecules would adhere to the zenolite surface thus removing water molecules from air in the beginning stages of vacuum. What my memory is fuzzy about: is the seive used just for water,or other gas molecules? [/QUOTE]
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Molecular Seive for making vacuum tubes
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