Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: New vacuum pump stand for sale
stoichiometric_steve
National Hazard
****




Posts: 827
Registered: 14-12-2005
Member Is Offline

Mood: satyric

biggrin.gif posted on 20-12-2009 at 08:52
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.



DSC00743.JPG - 147kB

DSC00745_1.jpg - 96kB

[Edited on 20-12-2009 by stoichiometric_steve]




View user's profile View All Posts By User
Panache
International Hazard
*****




Posts: 1290
Registered: 18-10-2007
Member Is Offline

Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein

[*] posted on 20-12-2009 at 17:47


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.




View user's profile View All Posts By User
stoichiometric_steve
National Hazard
****




Posts: 827
Registered: 14-12-2005
Member Is Offline

Mood: satyric

[*] posted on 22-12-2009 at 12:57


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.



View user's profile View All Posts By User
Chainhit222
Hazard to Others
***




Posts: 138
Registered: 22-8-2009
Location: peach's mailbox
Member Is Offline

Mood: grignard failing to start

[*] posted on 22-12-2009 at 12:57


http://img693.imageshack.us/img693/9352/dsc0388i.jpg
20 dollars and you can shovel snow into it as coolant.
View user's profile View All Posts By User
stoichiometric_steve
National Hazard
****




Posts: 827
Registered: 14-12-2005
Member Is Offline

Mood: satyric

[*] posted on 22-12-2009 at 12:59


great, more idiotic posts? this is not an aspirator.



View user's profile View All Posts By User
hissingnoise
International Hazard
*****




Posts: 3940
Registered: 26-12-2002
Member Is Offline

Mood: Pulverulescent!

[*] posted on 22-12-2009 at 13:58


Who wouldn't have fun with that, but it's way out of my range.
View user's profile View All Posts By User
DJF90
International Hazard
*****




Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline

Mood: No Mood

[*] posted on 22-12-2009 at 14:51


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 ;))!
View user's profile View All Posts By User
entropy51
Gone, but not forgotten
*****




Posts: 1612
Registered: 30-5-2009
Member Is Offline

Mood: Fissile

[*] posted on 22-12-2009 at 14:58


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.
View user's profile View All Posts By User
hissingnoise
International Hazard
*****




Posts: 3940
Registered: 26-12-2002
Member Is Offline

Mood: Pulverulescent!

[*] posted on 22-12-2009 at 15:24


Yeah, but how low will your aspirator go between April and October?
View user's profile View All Posts By User
hinz
Hazard to Others
***




Posts: 200
Registered: 29-10-2004
Member Is Offline

Mood: No Mood

[*] posted on 22-12-2009 at 15:28


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]
View user's profile View All Posts By User
entropy51
Gone, but not forgotten
*****




Posts: 1612
Registered: 30-5-2009
Member Is Offline

Mood: Fissile

[*] posted on 22-12-2009 at 15:54


Quote: Originally posted by hissingnoise  
Yeah, but how low will your aspirator go between April and October?
Well, if you weren't too lazy to UTFSE, you would... be as frustrated as I am.:o

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.
View user's profile View All Posts By User
Panache
International Hazard
*****




Posts: 1290
Registered: 18-10-2007
Member Is Offline

Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein

[*] posted on 23-12-2009 at 04:04


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.




View user's profile View All Posts By User
hissingnoise
International Hazard
*****




Posts: 3940
Registered: 26-12-2002
Member Is Offline

Mood: Pulverulescent!

[*] posted on 23-12-2009 at 04:40


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]
View user's profile View All Posts By User

  Go To Top