The purpose of this standard is to describe technologies applicable to the on-line monitoring of cooling water systems. The standard focuses on those technologies that provide data on a short-term basis (minutes to hours) and provide output in a form that may be used by the operator to deal with changing conditions in real time.

For the purpose of this standard, an on-line monitor for a cooling water system is defined as a device, or combination of devices, that measures corrosion rates and determines changes in heat transfer coefficients (fouling factors) by measuring pertinent parameters under steady-state conditions that simulate critical conditions in an operating heat exchanger in a reliable and objective manner and with acceptable precision and accuracy. (Nomenclature and abbreviations used in this standard are defined in Appendix A.)

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