stoichiometric_steve
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New vacuum pump stand for sale
Make: KNF
Model: SCC 820
Sports 2 independent controllers with automatic and manual distillation mode, ultimate vacuum of <8mbar, pumping capacity of 20L/min, and a
high-efficiency triple-face exhaust condenser.
The special design of this pump stand allows for extended lifetime of the pump through switching the pump on only to achieve and maintain preset vac
levels.
Can simultaneously and independently operate two Rotavaps, for example.
New, unused condition.
New price: 6000 EUR.
Pics of the actual item are attached.
Ships from Germany.
Reasonable bids and shipping quotes should be U2U'd.
[Edited on 20-12-2009 by stoichiometric_steve]
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Panache
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thats just a glorified aspirator.
btw how does it measure vacuum, by conductivity? Do the sensors need constant maintenance? You could have run an iron over that blue drop sheet, it's
all about presentation.
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stoichiometric_steve
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Panache, the unit has ceramic sensors which need no maintenance whatsoever. It appears that you have no knowledge of such equipment, comparing it to
an aspirator.
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Chainhit222
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http://img693.imageshack.us/img693/9352/dsc0388i.jpg
20 dollars and you can shovel snow into it as coolant.
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stoichiometric_steve
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great, more idiotic posts? this is not an aspirator.
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hissingnoise
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Who wouldn't have fun with that, but it's way out of my range.
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DJF90
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I would love it, unfortunately I do not have 6 big ones to spend on it! Ignore those that cant tell what it is, some people just can't appreciate such
apparatus until they've had the pleasure of using it (or one similar  )!
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entropy51
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| Quote: | | this is not an aspirator |
The brochure for it says it's an "alternative to a water jet pump".
8 millibar is about 6 mm Hg. With the cold tap water here today, my aspirator will easily pump to less than 10 mm.
It's real fancy, but not all that.
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hissingnoise
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Yeah, but how low will your aspirator go between April and October?
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hinz
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I´m currently building an aspirator, exactly for the reason Chainhit222 mentioned.
Sure it´s nice to use such a membrane pump, but they are harder to troubleshoot and you need money to keep them alive. E.g. the membranes need
replacement after certain time. Furthermore there has to be a source of cold water to prevent solvent vapor from getting sucked inside the pumping
chamber. The good thing is that membrane pumps have a good, water free, vacuum.
A glass aspirator can suck down nearly everything and with, say 5L of circulating water, all bad stuff gets sufficiently diluted not to cause any harm
to the cheap waterpump made from polyethylene or polyamide.
For my waterpump I paid 35€, the glass aspirator cost 12€ and the wood and the water bucket will probably cost around 20€
So I get a chemical resistant vacuum pump for <100€, with nearly no parts which wear out, the cheapest semi chemical resistant Vacuubrand M2Z
I´ve seen at ebay went for 180€.
There are also commercial circulating aspirators available:
http://www.jeiotech.com/eng/products/view.html?catNumber=1&a...
[Edited on 22-12-2009 by hinz]
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entropy51
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Well, if you weren't too lazy to UTFSE,
you would... be as frustrated as I am.
I posted something on a very hot day last summer (but TFSE can't find it), and IIRC my aspirator was pulling 12 or 14 mm Hg. The water here is never
so warm that I've had a problem with a vacuum distillation. There's not a lot of difference in boiling points for most compounds I distill at 6 mm or
12 mm.
If an aspirator is really not good enough for a distillation, I use my mechanical pump, which goes down to a few microns, or about 0.001 of the pump
for sale here. This pump cost less than 200 USD.
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Panache
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My comparison of that sublime bit of vacuum engineering to a 'aspirator' was made in complete jest. I was being sarcastic, its awesome and i want it,
hell i'd settle for one with teflon vanes that i don't have to do preventive maintence on every 7days. Although i find the one i'm using mostly (an
edwards belt driven one from the seventies i think) quite good, its quiet, reliable, pulls great and lets face it vacuum pumps have become more
convenient over the last 30 years buts thats about it really. Not that that i would know as i don't have a new one.
I have a further comment to make regarding the oil however i feel it more appropiate to write this in the 'tips and tricks' thread. lol.
Sorry for the confusion steve, sarcasm doesn't go well on forums, its so often not picked up and i have made this mistake many times before.
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hissingnoise
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Having 'lost' the absurd crutch of religion, a lively sense of humour at this time of year helps in all sorts of ways.
In many Christian countries, there is a spike in suicides in the run-up to Christmas.
[Edited on 23-12-2009 by hissingnoise]
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