Model FCL: Free Chlorine Measuring System
•Datasheet: Free Chlorine Measuring System
•Brochure: Power Industry Solutions From Emerson Process Management, Rosemount Analytical Liquid
The Model FCL free chlorine system is intended for the determination of free chlorine in fresh water. Unlike free chlorine analyzers from other manufacturers, the Model FCL does not use expensive sample conditioning systems or messy reagents to control pH. Instead, the analyzer automatically compensates for changes in the pH of the sample. The Model FCL is not intended for the determination of total chlorine or combined chlorine (like monochloramine). Nor, can the FCL be used for the determination of chlorine in seawater.
The Model FCL uses a membrane-covered amperometric sensor. A polarizing voltage applied to a platinum cathode behind the membrane reduces the chlorine diffusing through the membrane and keeps the concentration of chlorine in the sensor equal to zero. The current generated by the cathode reaction is proportional to the rate of diffusion of chlorine through the membrane. Because the concentration of chlorine in the sensor is zero, the diffusion rate and the current are proportional to the concentration of chlorine in the sample.
There is a difficulty, however. Amperometric free chlorine sensors measure only hypochlorous acid. Because free chlorine is a pH-dependent mixture of hypochlorous acid and hypochlorite ion, a change in pH will cause the sensor response to change even though the free chlorine level remained constant. Most manufacturers solve the problem by treating the sample with acid, which lowers the pH and converts hypochlorite ion into hypochlorous acid. The Model FCL Free Chlorine Measuring System Product Data Sheet PDS 71-FCL/rev.G January 2006 Model FCL avoids the expense and inconvenience of sample conditioning by measuring the pH and applying a correction to the raw chlorine sensor signal. The correction is valid between pH 6.0 and 9.5. For samples having pH between 9.5 and 10.0, consult the factory.
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•Datasheet: Free Chlorine Measuring System
•Brochure: Power Industry Solutions From Emerson Process Management, Rosemount Analytical Liquid