Concentration Monitoring & Closed Loop Control – A Technological AdvancementAuthors: Umut Tosun, M.S.Chem.Eng., and Axel Vargas; and Bryan Kim, Ph.D.
Company: ZESTRON America and Pressure Products Company, Inc.
Date Published: 10/13/2013 Conference: SMTA International
Historically, refractive index, either in the form of hand held devices or automated systems, has been the tool of choice to measure the concentration of a solute in an aqueous solution. With fresh wash bath, refractive index is very accurate. However, as the wash bath becomes contaminated, that is accumulates impurities including flux residue resulting from the cleaning process, the refractive index reading will be skewed yielding an erroneous measurement that results in a false correction and ultimately an unstable process.
This study focuses on exciting technological advancements made in concentration measurement and closed loop control utilizing new technology that can accurately measure aqueous cleaning agent concentration in the presence of flux loading. Comparative data will be presented confirming the reliability of this advanced process control methodology as compared to current methods.
Refractive index, wash bath, concentration monitoring, innovation, accuracy
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