Graham,
You're right. There is an air about me that forces me to respond to the
ebb and flow of current conditions. Inert, is not one of them.
The anticipation by you of a response from me is reward enough.
Thank you.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Friday, May 19, 2006 10:40 AM
To: [log in to unmask]
Subject: Re: [TN] N2 flow rates
Thanks Dan, that was what I'm looking for. I couldn't find that sort of
info on the Vitronics web site, and had same problem with BTU's web site
technical data sheets on their ovens.
I am however SHOCKED that Dewey couldn't come up with any bad puns, I
guess it's too pure a topic for him, the jokes don't work in an oxygen
starved atmosphere. Maybe he was working on some, but passed out.
Have a great weekend
- Graham
>>> [log in to unmask] 05/19/06 11:51AM >>>
That is probably best worked out with the reflow oven vendors for your
needs. I found our data sheet for Vitronics-Soltec XPM2 ovens. It
lists a
low and high volume rate for N2. Their 5 zone oven lists N2 flow rates
of
400 to 1400 cfh and their 8 zone lists 600 to 1600 cfh. We have their
8
zone oven in our SMT Lab. We run it at the upper end of that range
with
20-30ppm O2 in the reflow zone. They offer several options and tweaks
to
limit nitrogen consumption but we don't use them in our lab
environment.
Regards,
Dan Blass
Process Research Engineer
Area Array Consortium
Surface Mount Technology Lab
Universal Instruments Corporation
http://www.uic.com/wcms/WCMS2.nsf/index/Global_Svc_Support_31.html
On Fri, 19 May 2006 09:23:50 -0400, Graham Collins
<[log in to unmask]> wrote:
>Hello TechNet
>I'm looking at buying onsite nitrogen generation capability, and for
>our two machines (wave and reflow oven) it looks like I need about
1300
>SCFH capacity. My concern is that our reflow oven is both old, and 4
>zone, so it may need to be replaced in the next few years. (we are
>lead-free exempt but may have to make the change at some point in the
>next few years - hence I'd want a bigger oven)
>
>Our oven currently uses about 1200 SCFH of nitrogen. It is, as
>mentioned, old - and I assume that oven design has improved so a new
>oven will use less nitrogen compared to an old oven of the same size.
>As well, I'm guessing that going from a 4 zone to an 8 zone oven does
>not mean I should just multiply the nitrogen consumption by 2.
>
>So, after a huge preamble, my question is this: does anyone have a
half
>decently accurate estimate of what a modern 8 zone oven requires for
>nitrogen consumption?
>
>Thanks!
>
>regards,
>
>Graham Collins
>Process Engineer,
>L-3 Communications Electronic Systems Inc.
>Halifax
>(902) 873-2000 ext 6215
>---------------------------
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