You are right- but dry leak is great for production testing, not for
troubleshooting.
-----Original Message-----
From: AJAJIM [mailto:[log in to unmask]]
Sent: Saturday, February 17, 2001 4:04 AM
To: [log in to unmask]
Subject: Re: [TN] Method of Leak Testing
Why do not you try dry Leak test!.
Pressurize casting with shop air and monitor decreasing in pressure inside
casting over a period of time.
If you interested in, I can give more details.
Regards,
Mohammed A. Al-Ajaji
MFG Engineer
Advanced Electronics Company
e-mail [log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: bbarr [SMTP:[log in to unmask]]
Sent: Friday, February 16, 2001 8:12 PM
To: [log in to unmask]
Subject: Re: [TN] Method of Leak Testing
We do something similar to what Bill is describing. We have an
aluminum
enclosure that contains 4 disk drives. It is a hermetic sealed
enclosure
(airborne application - apparently disk drives stop functioning
around
15,000 feet in an unpressurized environment.) To check that the box
is not
leaking around the covers or connectors, we pressurized the box to 4
psi and
immerse it to look for air bubbles. We do not use water, however. If
water
got into the box it would ruin the drives. We immerse it in
Fluorinert which
will not affect electronics should it leak into the box. In fact, we
perform
pre-potting tests on high voltage power supplies while they are
immersed in
Fluorinert to prevent arcing. Yes, Fluorinert is expensive (about
$1,400 for
a 3 gallon container), but if you need a benign fluid to test in I
don't
know of any other alternatives. (The MSDS says this material can be
ingested
without any need for first aid!! Not sure what it tastes like
though.) We
had a ss sink with a lid fabricated just a bit larger than the box
and I
have only gone through one 3 gallon container in a year. Your
mileage may
vary depending on the size of your box. Most of the losses are
through drag
out.
Bob
Robert Barr
Manufacturing Engineering
Formation, Inc.
Voice: 856-234-5020 x3035
Fax: 856-234-6679
email: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Campbell, William
(wcampbel)
Sent: Friday, February 16, 2001 10:59 AM
To: [log in to unmask]
Subject: Re: [TN] Method of Leak Testing
You might try pressurizing your enclosure slightly with shop air
(maybe 2
psi or so) and dunking under water- the stream of bubbles out tell
quite a
story. Definitely not the best way, as the pressure applied here is
opposite real life in most situations, but good for troubleshooting,
and you
won't get water inside. Good luck, and think of a good story for
the
dishpan hands.
-----Original Message-----
From: Steffen, Don E [mailto:[log in to unmask]]
Sent: Thursday, February 15, 2001 8:34 PM
To: [log in to unmask]
Subject: [TN] Method of Leak Testing
Technetters
I am a Quality Engineer on a Safety Product that has a Leak Test
requirement. We are using a die cast aluminum housing that has a
porosity
issue. I want to find out if there are any one in the TECH NET world
that
might have some experience in leak detection methods. Water is out
of the
picture. Because of the vertura effect, water can be sucked into a
housing.
I am presently using water for troubleshooting purposes, but
everything that
is applied to water is scrap. I have tried Helium gas but this is
not always
reliable and repeatable. Is there anyone out there that can help me
out in
this dilemma?
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