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Author: Subject: KNF diaphragm pumps for sale!
stoichiometric_steve
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[*] posted on 26-5-2011 at 11:55
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.




knfselection.jpg - 220kB

[Edited on 27-5-2011 by stoichiometric_steve]




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Magpie
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[*] posted on 26-5-2011 at 15:21


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?




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stoichiometric_steve
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[*] posted on 26-5-2011 at 21:45


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
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[*] posted on 27-5-2011 at 07:07


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).



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