I’D Say If It Is Ions Why Is It Not Detected In The Contamination Test(Our Machine Is Calibrated) – Factors Affecting The Quality Of Ultra Pure Di Water

di water system design Can we measure the resistivity using bench top Resistivity meter or Pocket resistivity meter. We need a straightforward electrode or a flow cell is required, right? What is that which is causing the variation? If it’s ions why is it not detected in the contamination test. The result is always below detectable limit. When we monitor my online resistivity meter the changes are much it varies from 7 8 Mohms to 2 Mohms. Now look. We do contamination testing on the parts washed with High purity DI water. Actually, ions in very low concentration can cause the variation? Please give your expertise on this, so this will also provide a base for knowing more about Ultra pure DI water behavior. Please contribute as much as possible to this question. Deionized water is an extremely aggressive solvent. Some information can be found online. Ultra pure DI water will dissolve carbon dioxide and identical substances from contact with air, and it will begin to attack the container material -even steel or plastic. DI water. It will dissolve anything it possibly can, when water is purified to the level you describe. Your application requires higher than normal precision. I want to know more about DI water and its performance when trace contaminants are present.


We do have online measurement for measuring the resistivity of DI water and have instruments to estimate the trace ionics in the DI water.

Thank you very much for your valuable reply.

That is the reason I was looking for quantitative data. It is tim’s statement about plastics being attacked. PVC, Pe, PP, CPVC, PVDF, and suchlike and all the fluorocarbons, they are said to excel to their max. Needless to say, pVC is 140 degr. ABS, yes, even that ‘lowly’ material is said to be OK @ room temperature. Of course, easy to make. I would like to ask you something. Consider, please, floating lids for round tanks, OK? Meg Ohm water sure looses potency fast when exposed to air!


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