Ken,

     The answer depends upon your process, throughput and what you are
     soldering.

     At one employer I had one line where I needed to purge copper every
     couple months due to bare copper panels, the next line over, at
     similar solder consumption and equipment required purging every other
     year.

     At another employer, dross production was so high we had to add tin
     monthly to maintain composition until we could fix the problem.

     I suggest that you start at once/month until you notice you have
     composition changes. If you have no changes, try every two months,
     then once/quarter. Don't go less frequently, as unmonitored factors
     may affect your composition.

     Just my experience,



     Aric Parr


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Subject: [TN] frequency of solder pot content analysis
Author:  Ken Patel <[log in to unmask]> at INTERNET