I agree with Brian, I suggest that monitoring the final rinse conductivity
is a good fail safe warning, but not a process control. 





Regards 

Mike Fenner 
Indium Corporation 

T: + 44 1908 580 400 
M: + 44 7810 526 317 
F: + 44 1908 580 411 
E: [log in to unmask] 
W: www.indium.com 
Pb-free: www.Pb-Free.com 

---------------------

Indium Corporation
Incorporated in New York, USA
Registered office: (Not for correspondence) 
77-97 Harpur Street, Bedford , UK
Registered number: fc16473


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Friday, September 12, 2008 6:54 AM
To: [log in to unmask]
Subject: Re: [TN] Electrovert Wash PPM (TDS) Monitoring

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
> 
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0 To 
> unsubscribe, send a message to [log in to unmask] with following text in 
> the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt 
> or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing 
> per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: 
> http://listserv.ipc.org/archives Please visit IPC web site 
> http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at 
> [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
> 
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0 To 
> unsubscribe, send a message to [log in to unmask] with following text in 
> the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt 
> or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET 
> Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the 
> posts: send e-mail to [log in to unmask]: SET Technet Digest Search the 
> archives of previous posts at: http://listserv.ipc.org/archives Please 
> visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
> for additional information, or contact Keach Sasamori at 
> [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
> 
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0 To 
> unsubscribe, send a message to [log in to unmask] with following text in 
> the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt 
> or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET 
> Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the 
> posts: send e-mail to [log in to unmask]: SET Technet Digest Search the 
> archives of previous posts at: http://listserv.ipc.org/archives Please 
> visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
> for additional information, or contact Keach Sasamori at 
> [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
> 

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask] with following text in the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send
e-mail to [log in to unmask]: SET Technet Digest Search the archives of
previous posts at: http://listserv.ipc.org/archives Please visit IPC web
site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------


***This email, its content, and any files transmitted with it, are intended solely for the addressee(s) and may be legally privileged and/or confidential. If you are not the intended recipient, please contact the sender by return and delete the material from any computer. Any review, retransmission, dissemination, or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited.

Messages sent via this medium may be subjected to delays, non-delivery, and unauthorized alteration. This email has been prepared using information believed by the author to be reliable and accurate, but Indium Corporation makes no warranty as to accuracy or completeness. Indium Corporation does not accept responsibility for changes made to this email after is was sent. Any opinions or recommendations expressed herein are solely those of the author. They may be subject to change without notice.***

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------