On 1/14/12 4:23 AM, jb-electronics wrote:
So those are my first ideas, my questions are: 1) What could I use as a vacuum gauge? I need to have a resolution of about .1mbar, and a range of 1bar down to 1mbar or so. Does anyone know where to buy those at a reasonable price? 2) The vacuum pump I am considering to purchase is a pump that is used in refrigeration technique. Is it essential to use a 2-stage pump? I have no experiences in this area, that is why I ask. I just assume that with washing the tube I can make up for some of it. 3) Any comments? Suggestions?
The vacuums that are made in the world of cryo receivers are made with a turbo pump (very expensive but fast) backed by a scroll pump, but a diaphragm pump might be able to do the job. There's also the old Welch pumps, but they're very heavy.
Vacuum gauges are made by Varian. There's a panel meter and a little metal gizmo with an octal base like an old vacuum tube. Look on ebay.
Beyond that, I can't help.
Thanks for your time, and may the glow be with you, Jens
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