Hi Nick,
but I'm not sure what millitorr you're after...
for the start, I am only aiming at maybe 1 Torr or so, it does not have
to be perfect. The pump I purchased is used in refrigeration and is
specified to 0.03mbar which is pretty good if true.
I am not aiming for a pure vacuum at the moment, the reason behind my
question was this one:
When I have a large system to evacuate it takes rather long, granted.
But if I have leakages somewhere (for example at the cock that I use to
feed the penning mixture to the system) then the intruding air will
distribute homogeneously inside the vacuum.
When I have a small(er) system, it might not take so long to evacuate,
but in this case small leakages will ruin the system more rapidly.
So basically, the idea is to include a small volume in between to
compensate for that. Is that nonsense?
Jens
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
<webmas...@jb-electronics.de <mailto:webmas...@jb-electronics.de>> 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
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