Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


dennis warner

#12109

DI water | 30 March, 1999

We've been using a newly installed DI re-circulating system. It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cation, Anion, tanks re-circulated. I want to re-design the system, mostly adding a mixed bed and removing the HMR(chealet)tanks. Currently were using this for our TH-hole line only but will soon be using it on our SMT also. I'm sorry for all the words,I'm new. THE QUESTION:

Is there anyone else NOT using an HMR/chealet(heavy metals recovery)tank (lead etc..) in their DI system?

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Chris Lampron

#12110

Re: DI water | 30 March, 1999

| We've been using a newly installed DI re-circulating system. | It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cation, Anion, tanks re-circulated. I want to re-design the system, mostly adding a mixed bed and removing the HMR(chealet)tanks. | Currently were using this for our TH-hole line only but will soon be using it on our SMT also. | I'm sorry for all the words,I'm new. THE QUESTION: | | Is there anyone else NOT using an HMR/chealet(heavy metals recovery)tank (lead etc..) in their DI system?

Dennis, I am currently not using a Chealet filter in my DI system. Our system consists of carbon, cation, anion and mixed bed. We maintain a resistivity of 17 megohms and are getting about 3-4 mths out of our tanks. We are also using our system for thru hole and SMT assemblies. We havenot, as of yet, had problems with regenerating our filters due to heavy metals (knock on wood) At this point, it looks like we dont need the chealet.

Hope this helps

Christopher J. Lampron

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ScottM

#12111

Re: DI water | 30 March, 1999

| We've been using a newly installed DI re-circulating system. | It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cation, Anion, tanks re-circulated. I want to re-design the system, mostly adding a mixed bed and removing the HMR(chealet)tanks. | Currently were using this for our TH-hole line only but will soon be using it on our SMT also. | I'm sorry for all the words,I'm new. THE QUESTION: | | Is there anyone else NOT using an HMR/chealet(heavy metals recovery)tank (lead etc..) in their DI system? | I'm using strictly Carbon and a Resin Mixed bed combination from US Filters. Resistivity is above 15 Megs and I rotate one of the two mixed beds out about every 6 weeks, I clean an average of 60,000 boards a month both PTH and SMT. I keep the water circulating 24 hours/day, 7 days/week.

Scott

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dennis warner

#12112

Re: DI water | 31 March, 1999

| We've been using a newly installed DI re-circulating system. | It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cation, Anion, tanks re-circulated. I want to re-design the system, mostly adding a mixed bed and removing the HMR(chealet)tanks. | Currently were using this for our TH-hole line only but will soon be using it on our SMT also. | I'm sorry for all the words,I'm new. THE QUESTION: | | Is there anyone else NOT using an HMR/chealet(heavy metals recovery)tank (lead etc..) in their DI system? | Chris and Scott, thanks for the info. Do either of you dump your water?--i.e. first tank from washer, or once a day or a month or never? The reason I'm asking is that I'd like to remove the chealet tanks, but if I recirculate continusly and say dump once every 3 months, without chealet tanks, will I have accumulated metals(lead) that our city won't want all at once, whereas over time(each day) would ok, or will the small amount if any be picked up by me other tanks(Cr,Cat,An)?

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ScottM

#12113

Re: DI water | 2 April, 1999

| | We've been using a newly installed DI re-circulating system. | | It's been a big headache. Mostly understanding what causes our resistivity to be unpredictable. I think I've got a handle on that part now. The system consists of a Carbon,HMR(chealet),Cation, Anion, tanks re-circulated. I want to re-design the system, mostly adding a mixed bed and removing the HMR(chealet)tanks. | | Currently were using this for our TH-hole line only but will soon be using it on our SMT also. | | I'm sorry for all the words,I'm new. THE QUESTION: | | | | Is there anyone else NOT using an HMR/chealet(heavy metals recovery)tank (lead etc..) in their DI system? | | | Chris and Scott, thanks for the info. | Do either of you dump your water?--i.e. first tank from washer, or once a day or a month or never? The reason I'm asking is that I'd like to remove the chealet tanks, but if I recirculate continusly and say dump once every 3 months, without chealet tanks, will I have accumulated metals(lead) that our city won't want all at once, whereas over time(each day) would ok, or will the small amount if any be picked up by me other tanks(Cr,Cat,An)? | I don't dump my water "ever" - every couple of years I go through an acid/bleach cleansing process. Any lead in the water will be picked up by the the resin, any lead that's heavy gets accumulated in my trap tank prior to being pumped into my recirculation tanks (I'm running a two pump setup). I clean my trap out about once a month & dump it in my hazardous material drum labeled "Lead". US Filters treats the resin tanks as containing lead and handles them accordingly - for a price.

Hope this helps, Cheers, Scott

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