DEIONIZATION INSTRUMENTS MONITORING POWER SODIUM

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Abstract

Water treatment performance and determination of purity have depended on sodium measurement for nearly 4 decades. Monitoring cation-exchange performance and the purity of power makeup water, steam and condensate has benefitted from measurement of this key parameter. This ion-selective electrode method has been refined for these applications during this time. This article describes further improvements to sodium measurement technology, including a combination electrode system that measures pH as well as sodium to assure proper reagent delivery. The system design minimizes reagent consumption and reduces maintenance requirements below current practice. The new sodium system uses a particularly simple automatic calibration method and also provides the ability to measure grab samples easily. Its implementation with an operator interface common to other parameters, including conductivity, dissolved oxygen, pH, and oxidation reduction potential (ORP) makes it especially convenient for installation and operator training.

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