Sorry, do it as an AND but not as an XOR. Imagine a packet of
contaminants that did not get adequately washed. Rinse water
conductivity would not rise significantly but ionic contamination test
would be reject (as would reliability).
Brian
John Anselmo wrote:
> Kevin,
>
> We do Ionic contamination testing using an Omega Meter (600). We test 5 parts out of the wash, 4 times per day.
> We haven't had a failure in so long.....................
> What we want to do is control and monitor the wash water and eliminate the Ionic Contamination testing.
>
> Thanks,
> John
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Kevin Glidden
> Sent: Wednesday, September 10, 2008 1:54 PM
> To: [log in to unmask]
> Subject: Re: [TN] Electrovert Wash PPM (TDS) Monitoring
>
>
> John,
>
> I would recommend you monitor your water resistivity, not PPM, and in your
> water system only, not the washer tanks. The water from your water system
> should go directly to the final rinse. The final rinse is the most
> important cycle and should use only virgin DI water in a range (my
> recommendation) between 2 and 5 Meg-Ohms. I would classify 5-10 PPM water
> as "RO" quality only. Do you perform any post cleaning verification?
>
> The Myron L 750 series is a good meter.
>
>
> Kevin Glidden
> Manufacturing Engineer
> Luminescent Systems Inc.
>
> -----Original Message-----
> From: John Anselmo [mailto:[log in to unmask]]
> Sent: Wednesday, September 10, 2008 3:14 PM
> To: [log in to unmask]
> Subject: [TN] Electrovert Wash PPM (TDS) Monitoring
>
> Hi everyone,
>
> I have a couple of questions regarding how everyone monitors their DI wash
> process (those that still do water washing).
> We have an old Electrovert unit with 3 water tanks: the pre-wash, wash and
> rinse. The water temp is set to 140 deg F.
> We currently have a hand held TDS meter and check the water at a minimum
> weekly, more often if we have washed a large number of parts.
> We are looking at adding a continuous monitor/controller (such as the 750
> Series monitor/controller from Myron) to the wash line.
> But, I have a few questions regarding what the general practice is for those
> using a water wash daily.
>
> 1) What monitor/controller is most used/recommended?
> 2) What limit do you use for PPM? 5? 10?
> 3) Do you also have a chart recorder on your monitor?
> 4) Would you recommend monitoring all three tanks, or just the wash?
>
> Thanks,
>
> John
>
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