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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