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February 2013

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Subject:
From:
Lloyd Duso <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lloyd Duso <[log in to unmask]>
Date:
Fri, 1 Feb 2013 17:20:42 -0500
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We have the exact machine here and use it often. The cleanliness testing
portion is useful to set a range and let it rinse until it reaches that
point. It in no way replaces a task specific cleanliness tester like a
Zero-Ion or an old school Omega. Since it is a batch machine, the
cleanliness is just an average not a specific count for one board. The
benefit is that if it reaches the cleanliness value programmed in on the
first rinse it's done. If it hasn't reached that value it will keep rinsing
until it hits the programmed Max Rinse number. We still use the cleanliness
tester to validate the washing machine.

Lloyd E Duso
Plant Manager
(814) 535-3505
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Watson, Howard A
Sent: Friday, February 01, 2013 4:47 PM
To: [log in to unmask]
Subject: [TN] Manncorp Trident Batch cleaner Onboard Cleanliness tester

Hi all,

My shop just bought a batch cleaner (dishwasher type); the manual says it is
Aqueous Technologies, with an onboard cleanliness tester. This is a
resistivity meter that measures the resistance of the rinse water, and I
believe it has a range of 2k to 2000k ohm. This unit has both a closed-loop
wash and  rinse, and we are using DI water. Does anyone have any experience
with this type of cleaner with an "onboard cleanliness tester"?  Is this
mostly for process control?  The manual is recommending a baseline
cleanliness of 200-400 kOhm. I realize that this tester is not going to
provide a level of cleanliness or contamination of each board processed, but
I'm not sure what it is good for other than indicating the rinse water needs
to be changed.

I was not involved in the selection of this system, but tasked with
qualifying it.  My previous experience has been with no-clean processes, so
cleaners are new to me!  I should add that currently we process a very small
volume of PCBAs for space. All work is hand assembly and cleaning is by hand
with Ensolv. The goal is to get away from Ensolv while still achieving clean
boards. This shop has never done ionic contamination testing, ROSE, SIR,
etc.  I believe some people were sold on the "onboard cleanliness tester" as
a cure-all for aqueous cleaning validation, but I'm skeptical as to the
benefits.  Any insight is appreciated.


Howard A. Watson


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