Jens, as somebody who uses a two stage direct drive vacuum pump everyday, we utilize a cold finger trap inline with the vacuum pump to trap volatiles (I'm an organic chemist). This will increase your ultimate vacuum (by reducing gas pressure), but I'm not sure what millitorr you're after...presumably quite low if you're trying to outgas the components in the tube then refill with penning mixture? As a rule, the more volume you're trying to evacuate the less the ultimate vacuum will be (obvious I know).
What pump did you end up buying? Nick On Wed, Feb 1, 2012 at 11:08 AM, jb-electronics <[email protected] > wrote: > Hi folks, > > I finally ordered a two-stage vacuum pump, it will arrive here any day > now. It comes with a flexible tube that has a special adapter that fits the > vacuum pump. > > First I was planning to directly connect the flexible tube with my glass > tube, they have about the same diameter. The length of the flexible tube is > about 1m, so it is rather long. > > Then I asked myself: Does a rotary pump require some reservoir to work > better? I.e. is it better to have some dummy volume capacity hooked up in > series? If yes, is the 1m tube enough? Or does it work better when I keep > the connection as short as possible? > > Thanks for your input, > Jens > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to neonixie-l+unsubscribe@** > googlegroups.com <neonixie-l%[email protected]>. > For more options, visit this group at http://groups.google.com/** > group/neonixie-l?hl=en-GB<http://groups.google.com/group/neonixie-l?hl=en-GB> > . > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
