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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