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Mike Wells wrote:
>
> I just made another O2 analyzer and am interested in making my own O2
> samplers as shown in Oxy Hackers. I have the fittings and only need to
> know what material is used for the flow restriction. It only says
> "filter media" and doesn't specify what kind or where to get it. Is this
> just a stack of sintered metal filters from regulators, or can one get
> the sintered material in a thicker piece and cut it until you get the
> right flow?
>
> Thanks in advance for any input,
> Mike W.
> Oregon, USA
Here's a post from a buddy of mine. If anyone knows where to get this
stuff let me know.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark Melendez
melendez at bigfoot dot com
Subject: No Machining flow restrictor
Date: Wed, 06 May 1998 15:44:22 -0400
From: Roger Lacasse <lacasse@po*.ca*.ca*>
Organization: CAE Electronics Ltd.
Here si something you might want to put into your next edition of
the O2 hacker's companion.
I made a flow restrictor out of a barb to female 1/2 NPT, BC
to 1/2" NPT and 0.5 micron S/S sintered filter from Swadgelok.
The sintered filter would normally let 20 to 50 times to much
gas through at 140 psi differential. The idea is to use epoxy glue
to glue the filter to the inside of the barbed part and to cover most
of the surface of the filter. Leaving a small spot of about 3 mm
in diamter exposed. I now have a flow restrictor
that lets about 3 liters per min go through. Costs:
barbed to 1/2 NPT 1$
sintered filter is about 3.5$
BCD connector 5$
To measure that, I used a large measuring cup inverted inside a bucket
of water while feeding the output of the restrictor.
ps: I'm quite sure that I used "O2 compatible" epoxy though...
--
Roger Lacasse C.elec.: lacasse@ca*.ca*
Groupe des commandes de vol, departement 24 Tel (514) 341-2000 #2973
CAE Electronique Ltee Fax (514) 734-5741
--
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