AWWA C670:2015 pdf download.Online Chlorine Analyzer Operation and Maintenance
Continuous chlorine residual monitoring is used for two primary purposes: process control and regulatory compliance. Process control implies that the reason for testing the chlorine content of water is primarily to determine how well a pro- cess is working (e.g., how consistent the chlorine residual is in efuent from a fash mixer, how much chlorine is removed from disinfected water, etc.), to control chlo- rine feed equipment, and to ensure appropriate chlorination of the fnal product. Te rate of ammonia application may be controlled by the residual from the chlorine analyzer to maintain an acceptable chloramine speciation. Process control may also imply analyzing residual chlorine content in distribution or transmission systems. A sudden decrease in measured chlorine residual may be indicative of malfunctioning equipment, system failure, groundwater intrusion, or introduction of some chlorine- consuming contaminants.
Testing the chlorine content of water primarily for regulatory compliance often involves testing method constraints, including sample collection point, anal- ysis methods, sample interval, and chlorine residual targets. If testing is for regula- tory compliance, the authority having jurisdiction (AHJ) shall be consulted prior to purchasing an online chlorine analyzer.
The purpose of this standard is to provide the minimum requirements for online chlorine analyzer O&M, sampling requirements, accuracy and precision testing requirements, range requirements, and methods of calibration and trouble- shooting.
Sec. 1.3 Application
This standard can be referenced in documents for purchasing online chlorine analyzers, can be used as a guide for verifying the accuracy and precision of online chlorine analyzers, or can assist utilities in establishing online chlorine analyzer O&M procedures. Te user should ensure the environmental conditions of the application match the manufacturer-specifed conditions and requirements for the analyzer. Te stipulations of this standard apply when this document has been referenced, and then only to online chlorine analyzers used in the treatment and monitoring of potable water, reclaimed water, or wastewater.AWWA C670 pdf download.