stoichiometric_steve
National Hazard
Posts: 827
Registered: 14-12-2005
Member Is Offline
Mood: satyric
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KNF diaphragm pumps for sale!
It also turns out i'm the vac pump guy, so i wanna let you see what i have to offer here (better pic of each individual pump coming soon):
N840.3 FT.18
N810.3 FT.18
N035.3 AN.18 (5 pcs)
N145.2 STE
N035.1 AN.18
N 813.3 ANE/DC B (2x) 24V (2 Stages / 3mbar ultimate vac)
All of these pumps are 220V unless stated otherwise. Each pump is fully operational and in "like new" or "very good" condition. Diaphragms and valves
have been replaced where necessary.
I will sell and send anywhere in the world.
Shipping to the US via DHL is
up to 2 kg (max. L+B+H=90 cm, > 60cm) 13,90 EUR
up to 5 kg (max. 120 x 60 x 60cm) 34,00 EUR
up to 10 kg (max. 120 x 60 x 60cm) 44,00 EUR
up to 20 kg (max. 120 x 60 x 60cm) 64,00 EUR
up to 31,5 kg (max. 120 x 60 x 60cm) 84,00 EUR
plus a small charge for packaging cost (typically less than 5 EUR).
Contact me via U2U for offers and questions.
[Edited on 27-5-2011 by stoichiometric_steve]
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
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Steve,
I looked at the following KNF/VWR website:
http://www.knf.com/vwr.htm
It says that it is advisable to use a dry ice cold trap ahead of the pump. What is the advantage of a Teflon oilless pump if you have to set up a
cold trap anyway?
The single most important condition for a successful synthesis is good mixing - Nicodem
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stoichiometric_steve
National Hazard
Posts: 827
Registered: 14-12-2005
Member Is Offline
Mood: satyric
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I think you could have answered that for yourself  Everything that eventually
escapes the trap will do less damage to a teflon pump head than it would to a neoprene/aluminum/steel head.
I do not use traps with diaphragm pumps.
I own a KNF SCC 820 dual vac controlled pump stand and it only includes a Woulff bottle to remove particles, everything else is blown out of the
exhaust. Not seeing the use of a trap here.
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smuv
National Hazard
Posts: 842
Registered: 2-5-2007
Member Is Offline
Mood: Jingoistic
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Where I worked we used teflon diaphragm pumps for rotovaps, whatever wasn't codensed by the chiller (-10c) went through the pump. The pumps have
lasted for years of very heavy use, without rebuild, and still pull very good vacuums (for diaphragm pumps).
"Titanium tetrachloride…You sly temptress." --Walter Bishop
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