. blows down based on conductivity, and makeup proportional systems . pump is activated based on addition of a set amount of makeup to the cooling . makeup . | AWT 2008 Annual Convention & Exposition November 5-8, 2008, Austin, TX BlueTrak: Automatic Monitoring and Control of Cooling Water Treatment Products Presented by: James Sleigh ProChemTech International, Inc. 51 ProChemTech Drive Brockway, PA 15824 Questions with: Brent Rodden Advantage Controls, Inc. 4700 Harold Abitz Drive Muskogee, OK 74403 Control of cooling water inhibitor dosage is one of the critical issues in achieving good results as to control of scale, corrosion and deposition; minimization of water management program operating cost; and environmental compliance. While manual test and control using easy to test for actives such as chromate, phosphate, and molybdate can provide acceptable results, automation of the dosage generally provides much superior results and is generally used at the present time. Current Control Technology Automatic control of cooling water inhibitor dosage is generally based upon measurement of a system parameter; such as on time, conductivity, or makeup water amount; and dosing of the inhibitor based upon a relationship between the measured parameter and the amount of inhibitor needed to treat the system. Thus we have simple timer devices where a chemical pump is activated based on system operating time, control systems where a chemical pump is activated whenever the system blows down based on conductivity, and makeup proportional systems where a chemical pump is activated based on addition of a set amount of makeup to the cooling system1. These control schemes all suffer from one, or more, problems in the real world where the relationship between the measured parameter and the amount of inhibitor needed is broken due to such things as leakage, cross ties (in leakage), thermal load changes, and changes in the makeup water quality. Attempts have been made in the past to utilize on-line monitoring of various cooling water parameters, such as ortho phosphate and molybdate, as either product components or tracers to control feed of
