I wondered if anyone had a user manual for it or a similar model - or any other useful information?
I've never used a vacuum pump before, and this seems to be a fairly decent one (non oil too which is great) but there are a couple of questions I have
about it - firstly, why does it have two holes? Surely as a vacuum pump it does not require an 'outlet', only an 'inlet'
Is there any other equipment required such as a pressure gauge?
Can I connect it directly into glassware via a vacuum adaptor or are they adjustments I need to make?
Thanks for the help!bbartlog - 8-3-2010 at 13:06
'Surely as a vacuum pump it does not require an 'outlet', only an 'inlet' '
Uh, what do you think it's doing with all the gas it pumps out of your assembly? It can't destroy it nor compress it to neutron star density. So of
course it needs an outlet. It's just moving the fluid around.1281371269 - 8-3-2010 at 13:19
Yeah of course, but in a vacuum cleaner you don't have an outlet tube do you - you have a vent.
To clarify, I'm asking why on a laboratory vacuum pump one would require the ability to blow air out through a directed tube.dann2 - 8-3-2010 at 13:21
To control and get rid of any stinking, toxic fumes that you may be sucking/pumping.starman - 9-3-2010 at 03:16
Your little diaphragm pump is dual purpose Mossydie,it also can be used as a compressor,hence the other outlet.Don't get too excited about the vacuum
you can pull out of one of these.Usually you can do better with an aspirator.Depending on what you're running a vapour trap inline might also be a
good idea.
[Edited on 9-3-2010 by starman]entropy51 - 9-3-2010 at 07:03
Quote:
Usually you can do better with an aspirator.
Actually you can always do better with an aspirator.
The pump specs say the rated vacuum is 280 mbar, and 1 torr = 1.333 mbar, so the pump will pull about 210 torr. By way of comparison, a good
aspirator will pull 15 torr or less, depending on water temperature.
These pumps are OK for filtering, but I have never seen anyone use them for a dsitillation.1281371269 - 9-3-2010 at 12:41
Sure, but on the other hand this cost me £30 and an aspirator / 3bar pump setup would be well into the hundreds.
Surely for things like concentrating H2O2, evaporating solvents, and so on, this would be fine? It's mainly for filtrations anyhow.entropy51 - 9-3-2010 at 13:00
Well, the boiling points will be somewhat less than at atmospheric pressure. It should be fine for filtrations.
