Question: How often do those of you using a nitrogen atmosphere in your SMT reflow ovens have the nitrogen flow (and/or nitrogen content of the oven atmosphere) checked? The question just came up from a sister site of ours. We would like to see if there is a defacto standard (or general consensus) for doing this on a specified periodic basis. I would also like to add it to our list of process control measures. And, if/when you do this test, do you have the nitrogen supplier perform it, or do you use your own test gear, or ????? Anyone care to offer an opinion, quote a process standard in this regard or offer some detail about this activity? Thanks! Dale Ritzen, CQA AMS Quality Manager --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------