Product category:
Liquid Analysis: pH, Conductivity, ISE
News Release from: Emerson Process Management | Subject: FCL Free Chlorine Measurement System
Edited by the Processingtalk Editorial
Team on 14 July 2003
Free Chlorine measurement system needs
no reagents
Emerson Process Management introduces the Rosemount Analytical Model FCL Free Chlorine Measurement System, designed to eliminate cost and complexity in the chlorine analysis of fresh water
Emerson Process Management introduces the Rosemount Analytical Model FCL Free Chlorine Measurement System, designed to eliminate cost and complexity in the chlorine analysis of fresh water The Model FCL is the industry's first complete chlorine measurement package, including a sensor, connecting cable, analyser and panel-mounted flow controller -- ready for immediate installation
This article was originally published on Processingtalk on 8 Aug 2008 at 8.00am (UK)
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In addition, the Model FCL does not require sampling systems and messy reagents for the control of pH, since the analyser automatically compensates for changes in the pH of the sample, a significant time and money-saving capability.
The packaged design of the Model FCL simplifies installation in the field, and also eliminates the need for multiple orders from multiple suppliers with the potential that parts may not work together.
According to John Wright, vice president of the Rosemount Analytical business of Emerson Process Management, "Contractors and users have really driven the creation of the Model FCL fully packaged free chlorine system.
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All of these parts have been pre-selected to work together optimally in water applications.
The one-step ordering and simple installation save hours and hours of time and energy".
The Rosemount Model FCL uses a membrane-covered amperometric sensor that, like all such sensors, measures hypochlorous acid.
Free chlorine, however, is a pH-dependent mixture of hypochlorous acid and hypochlorite ion; therefore, a change in pH will cause the sensor response to change even though the free chlorine level remains constant producing an incorrect measurement.
Most systems solve the problem by treating the sample with acid, which lowers the pH and converts the hypochloride ion into hypochlorous acid.
The Model FCL, however, avoids the inconvenience of sample conditioning and the cost of reagents by measuring the pH and applying a correction to the raw chlorine sensor signal.
Considering that most water installations include multiple free chlorine sensors mounted throughout the plant even miles from each other, the elimination of the sampling step is a notable step forward in efficiency.
The Model FCL includes the easy-to-use Model 1055 analyser that features two fully programmable 4-20 mA outputs and three fully programmable relays.
Sensors are easily replaced due to the Variopol quick-disconnect fittings.
The large, back-lit two-line display allows the user to read sample pH and chlorine concentrations at a glance.
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