Enough about oven advertisements!

> -----Original Message-----
> From: ETS [SMTP:[log in to unmask]]
> Sent: Thursday, April 30, 1998 12:59 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] ASSEMBLY: Nitrogen Reflow
>
> Doug,
>
> Pretty cheap shot there. What are you trying to say, that I and my
> company
> promote waste of our natural resources. If I were you I would not make
> any
> claims that I cannot support with facts.
>
> I would also like to challenge your statement of your reflow using one
> half
> to one third of the N2 that our reflow systems (or any others for that
> matter) use. I am sure that the people on this forum would like to see
> who
> has the lowest N2 consumption. In addition you should mention how
> wide, long
> and tall your process cavity is as that makes a big difference. At ETS
> we
> compare N2 consumption to throughput.
>
> Brian
>
> >Hello again Brian,
> >
> >In my immediate defense I have to say that not only do we discourage
> the
> >wanton waste of natural and national resources by using too much
> Nitrogen
> >but also we offer a Reflow System that uses one-half to one-third of
> the
> >consumption rate of any oven I have seen on the market.  Ok, ok, I'll
> stop
> >with the tongue-in-cheek adverts =-)
> >
> >On to the technical issues, I would say that the effect will not be
> quite a
> >linear relationship but it should be pretty close.  At the same flow
> rate
> >and all variables being constant (bar the additional oxygen
> molecules) I
> >would not see you having any problem getting under 50 ppm with a 25 -
> 30
> >ppm source - if that is indeed what they are able to get (I suggest
> making
> >sure they are correct about their numbers).  So, unless someone
> disagrees,
> >I do not think the expansion rate differentail between N2 and O2 will
> be
> >significant.  If you find out otherwise please let me know.  I may
> not be
> >telling you anything new, but there's my two-cents.  Take care.
> >
> >Doug Bennett
> >Sales Engineer
> >Heraeus Amersil, Inc
> >Atlanta, Georgia, USA
> >770-623-5630 ext 4225
> >
> >
> >
> >At 03:39 PM 4/29/98 -0700, you wrote:
> >>Doug,
> >>
> >>I appreciate your input but it does not really answer my question. I
> am
> >>aware that by putting high amounts of N2 in the machine the customer
> can
> >>reach the same PPM level as the source Nitrogen but no customer in
> their
> >>right mind is going to want to pay for that. You may ask your
> customers to
> >>do that but we look for affordable N2 processing methods for our
> customers.
> >>Sorry, had to put at least one plug for my company just to return
> the favor!
> >>;-)
> >>
> >>The real question is at the same flow rates how will the purity
> levels in
> >>the process cavity be affected if the source is 25 - 30 ppm. Keep in
> mind
> >>that ETS ovens run at approx 9 ppm throughout the process cavity
> when the
> >>source is less than 5 ppm (approximately 2-3 ppm). Should the
> customer be
> >>able to acheive less than 50 ppm (in other words add the inpurities
> in the
> >>source to the PPM levels acheived in ETS Factory or does the
> expansion rate
> >>of O2 affect this number)?
> >>
> >>I appreciate any advise offered.
> >>
> >>Brian
> >>
> >>
> >>
> >>
> >>>Hi Brian,
> >>>
> >>>To answer your question they will be able to reach whatever
> >>>purity level their gas is spec'ed at as long as they are willing to
> pay for
> >>>it in total nitrogen consumption.
> >>>
> >>>Simply put, the spec residual oxygen level will be dependent on the
> >>>internal (relative) positive pressure of the gas inside the process
> >>>chamber.  Specific formulas for consumption depend on oven design
> so it is
> >>>best to use empirical data - i.e. run experiments.  But if they
> crank up
> >>>the internal pressure they will be able to reach those levels but
> they will
> >>>have to pay for it, and prices of Nitrogen in Asia are quite
> expensive.
> >>>
> >>>On another note, your customer will also have fluctuating levels of
> >>>residual oxygen along the length (and width for that matter) of the
> process
> >>>chamber.  This situation depends on your configuration for feeding
> nitrogen
> >>>into the process chamber.  So, if your customer has concerns about
> >>>reliability of a steady residual oxygen level throughout the entire
> process
> >>>chamber this could be a problem.
> >>>
> >>>Hope this helps
> >>>
> >>>Doug Bennett
> >>>Sales Engineer
> >>>Heraeus Amersil, Inc.
> >>>Atlanta, Georgia
> >>>770-623-5630 ext 4225
> >>>
> >>>
> >>>At 04:48 PM 4/27/98 -0700, you wrote:
> >>>>Dear Technet,
> >>>>
> >>>>My company builds reflow ovens that are capable of processing in a
> Nitrogen
> >>>>(N2) atmosphere. We are getting ready to send an N2 machine to a
> >customer in
> >>>>Asia. While preparing for the installation our customer found that
> his
> >>>>source N2 has 25 - 30 PPM of Oxygen (O2). At our factory we have
> source N2
> >>>>that is 99.999% pure or has 1-3 PPM of O2. With this source purity
> level we
> >>>>are able to acheive less than 20 PPM of O2 in the process cavity.
> With this
> >>>>in mind what purity level should our Asian customer be able to
> acheive with
> >>>>his source of 25 - 30 PPM?
> >>>>
> >>>>Is there a relationship between source N2 and process cavity
> purity levels
> >>>>at constant flow rates? Does it have something to do with the
> expansion
> >>>>rates of these gases during heating?
> >>>>
> >>>>Thanks in advance for all replies.
> >>>>
> >>>>Brian Stumm
> >>>>
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