Chemical Processing - July 2008 - (Page 37)

aging of sensor mV 100 Horizontal shift: Vibration Analysis & Balancing 11 13 pH Slope shift: 0 1 3, 5 7 Vertical shift: between pH and reference -100 Silver/Silver chloride reference + + + - Figure 6. Various factors can contribute to a shift in the slope. Potassium chloride and checking to seejunction if the Reference reading returns to normal. In Reference junction some cases however, a sensor that digitizes the signal may provide only real solution. The correct sensor will improve production — avoiding off-spec products and waste — and lead to a more energy efficient and profitable operation. bhupen R. paTel is business manager, analytical products — Midwest, for Endress+Hauser, Inc., Greenwood, Ind. + +Take some basic sTeps + Selecting the appropriate pH sensor technology requires KCI electrolyte under- VIBXPERT® H + standing the particular process + chemistry and conditions, and their impact on the sensor. This +will allow you to choose a sensor that will save chemicals and time. FRed kohlmann is Sussex, Wis., based business manager — upper Midwest for Endress+Hauser. E-mail them at bhupen. patel@us.endress.com and fred.kohlmann@ us.endress.com. ReFeRence 1. Sørensen, S.P.L., “Electrometric method of determining hydronium ion concentration,” Carlsberg Laboratories, Copenhagen, Denmark (1924). (Sørensen’s original paper.) FuRTheR ReadinG Cotton, A. F. and G. Wilkinson, “Advanced inorganic chemistry, a comprehensive text,” 3rd ed., p. 320, Wiley Eastern, Mumbai, India (1972). “Handbook of chemistry and physics,” 66th ed., p. F-253, CRC Press, Boca Raton, Fla. (1985-86). Kohlmann, F., “Understanding pH in practical terms,” internal technical document, Endress+Hauser, Greenwood, Ind. (2007). [Available upon request.] Skoog, D. A., “Principles of instrumental analysis,” 3rd ed., p. 574, Thomson Learning, Stamford, Conn. (1985). Slowinski, E., and W.L. Masterton, “Chemical principles,” 2nd ed., p. 428, W.B. Saunders, Philadelphia (1969). Tanis J.N., “ Procedures of industrial water treatment,” Ltan Inc., Ridgefield, Conn. (1987). h Watc O VIDEne Onli VIBSCANNER® The right tool for every user, job and budget 305-591-8935 • www.ludeca.com http://www.ludeca.com http://www.ludeca.com

Table of Contents Feed for the Digital Edition of Chemical Processing - July 2008

Chemical Processing - July 2008 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Who’s a Big Hit? Succeed with Condensate Control Take Some Basic Steps with pH Measurements Steam Projects Provide Fast Payback Process Puzzler Plant InSites Equipment & Services Product Spotlight/Classifieds/Ad-Lits Ad Index End Point

Chemical Processing - July 2008

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