artemov
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Pump for Condenser and Aspirator
Just a quick check, are micro diaphragm pumps like the one below suitable for both purposes?
I'm trying not to get too many equipments ... space is limited here ...
With RMB dropping, time for shopping.
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Sulaiman
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In my opinion ... too big for cooling water but too small for an aspirator 
EDIT : I use a 12V 3.6W pond pump for water circulation
using my heating mantle at full power (380W) the cooling water temperature rise due to the condensers is only about 3oC.
I do not have an aspirator,
for filtering etc. I use a cheap (Chinese via eBay) 12 Vdc, -80kPa vacuum pump.
[Edited on 4-9-2019 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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RedDwarf
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I use a 15W pond pump for my cooling, which gives a good flow.
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XeonTheMGPony
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cooling = you be screwed, it can break some spiral condensers due to pulsations and blown apart connections
do not do it!
I use an MCP650 from swift tech but I had it from my old server water cooling days.
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artemov
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You talking about this?
So far the <US$10 ones are all -66kPa or so ... the -80kPa ones are quite ex ...
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Sulaiman
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The pump that you showed is adequate for vacuum (reduced pressure) filtering, but it would be slower than the pump that I use.
(-66kPa is -2/3 atmosphere, equivalent to a water column 6.8m (22 ft.) high)
The model of vacuum pump that I purchased seems to be no longer available via eBay,
but this looks like an updated version ;
https://www.ebay.co.uk/itm/80Kpa-Mini-Vacuum-Pump-DC-12V-Sma...
For filtering, first the bulk of the air has to be removed from the filter flask,
a higher l.p.m. or c.f.m pump helps speed up this phase,
once the bulk of the air has been removed, lower pressure makes filtering faster,
the airflow rate is negligible - if there are no air leaks.
If the pressure is too low (e.g. my rotary vane vacuum pump)
it may (or may not) cause wet filter papers (especially the cheap ones that I buy) fail/perforate.
CAUTION : Hobby Chemist, not Professional or even Amateur
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artemov
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Thanks Sulaiman. Cheers guys.
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