10 Apr
2007
10 Apr
'07
2:50 p.m.
G'Day,
On 10/04/07, Sridhar Ayengar <ploopster at gmail.com> wrote:
[construction of a clean box]
Fourth, it's a good idea to use an inert gas
supply. For reasons of
availability and price, the best choice might be nitrogen. Bottled
nitrogen won't be completely clean, so an air filter is probably a good
idea. Don't use a paper one, obviously. I use a glass allergen filter.
And the gas should go through a regulator. If it comes out too
quickly, it could get supercooled, and that would not be fun. And don't
forget to create a gas outlet with a one-way valve, to prevent outside
air from getting in. If you don't put in an outlet, the gas will find
its own outlet, and that won't be good.
Just a small thing about the inert gas supply - if you do this make
sure it is in a well ventilated space - otherwise you will feel sleepy
and possibly never wake up. This would be a bad thing.
There seem to be lots of hepa filters on the market so getting a good
clean gas supply should not be too difficult.
Don't use an air compressor - they have a tendency to put oil in the
air and you run the risk of having condensation come out of the air
supply. There are ways to remove the oil and water, but if you can
afford to do this, a clean room is pretty simple.
[Rest of excellent advice on building a clean box].
Simon
--
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"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh