达拉斯阿灵顿市和德克萨斯州沃思堡市与其电力供应商德克萨斯公用事业公司合作，努力确定、实施并记录成功的臭氧残留在线监测项目的特征和属性。评估项目涉及三个问题:仪表的准确性；提高和维护仪表的可靠性；当仪表用于自动过程控制时，检测并防止仪表突然出现意外故障。达拉斯市和沃思堡市分别在Elm Fork和Eagle Mountain水处理厂使用臭氧进行消毒。合规性是通过臭氧维持至少2 log病毒灭活信用来实现的。在两个公用事业公司按要求的4小时间隔采集抓取样本。不幸的是，原来的- 废弃了臭氧残留在线监测系统。每个接触器的单个监测器安装在连接到单个电池采样线的公共线上。来自每个单元的样本流通过电磁阀引导通过监测器。三个主要问题导致在线残留监测系统被废弃。对于该项目，每个工厂都强调了剩余监测器性能的不同方面。鹰山沃思堡水处理厂通过在线监测仪的臭氧残留和抓取样本来评估消毒性能。达拉斯埃尔姆福克WTP评估了三种不同监测器的性能。进一步描述了每个工厂的研究方法。

The cities of Arlington, Dallas, and Fort Worth, Texas, joined with their electrical energy provider, Texas Utilities, in an effort to identify, implement and document characteristics and attributes of a successful on-line ozone residual monitoring program. The three issues the project addressed were: assessing meter accuracy; improving and maintaining meter reliability; and, detecting and protecting against sudden, unexpected meter malfunction when meters are utilized for automatic process control. The cities of Dallas and Fort Worth use ozone for disinfection compliance at the Elm Fork and Eagle Mountain Water Treatment Plants, respectively. Compliance is achieved by maintaining a minimum 2-log virus inactivation credit with ozone. Grab samples are collected at the required 4-hr interval at both utilities. Unfortunately, the original on-line ozone residual monitoring systems were abandoned. The single monitor for each contactor was installed on a common line that was connected to the individual cell sample lines. Sample flow from each cell was directed through the monitor via a solenoid valve. Three main problems caused the on-line residual monitoring systems to be abandoned. For this project, each plant emphasized a different aspect of residual monitor performance. The Fort Worth, Eagle Mountain WTP evaluated disinfection performance as determined by ozone residuals from the on-line monitors and by grab samples. The Dallas, Elm Fork WTP evaluated performance of three different monitors. The study approach at each plant is further described.