Steve, it is the gasket or seal that cost a lot.  Many of flux are
corrosive.  The standard rubber didn't last that long (you can't control the
rubber composition, so you may end up with some sulfer deposite on your
PWA).
                                            jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
>Sent: Tuesday, July 09, 2002 9:08 PM
>To: [log in to unmask]
>Subject: [TN] Water soluble batch washers...
>
>
>Hi all,
>
>This is a little bit off-the-wall, and maybe sounds a bit cheap, but I'm
>going to ask anyway...
>
>We have a inline water soluble cleaner (an Electrovert H-500) that
>is located
>at one end of the plant. Problem is, that at the other end of the
>plant there
>is hand soldering (rework and touch-up) being done. As probably many of you
>have learned, operators don't want to make the trip all the way down to the
>other end of the plant to get their boards cleaned until they have
>a rack of
>boards that will make the trip worthwhile... which is understandable from a
>purely logistics point of view. But that sometimes results in the flux
>residues being left on the boards longer than what is desired.
>
>So the idea was brought up to get a couple of small batch cleaners
>closer to
>the area so that it would be so much of a trek to get the boards
>cleaned in a
>timely manner.
>
>Sounds like a good idea. My question is, most of the batch
>cleaners I've seen
>are glorified dishwashers. When you price these units you find
>that they are
>much, much more expensive than a dishwasher, but the operating systems are
>basically the same. I did a search for commercial dishwashers and can find
>nice beefy stainless constructed ones that have heated wash and
>rinse cycles,
>decent powered pumps, that are a third of the price that some of
>"specifically designed for printed circuit cleaning" washers cost.
>
>The wash nozzles are basically the same, rotating wands. Rack
>systems are the
>same, roll-in, roll-out racks that look very similar to what I've seen in
>every dishwasher I've ever had in my home.
>
>So my question is, has anybody ever had a real dishwasher in use to clean
>water soluble residues? We will supply DI water to them straight from the
>resin beds, and will be able to set appropiate cycle times to
>ensure thorough
>cleaning.
>
>From my take on things, this should work pretty good without
>having to spend
>a bunch of money on a machine that can be had for much cheaper and not
>actually called "A printed circuit assembly batch aqueous cleaner"...
>
>Any comments?
>
>-Steve Gregory-
>
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