ABSTRACT
This chapter describes that the flow measurement systems have a more complex structural diagram than flow meters because they use complex flow measurement methods. The analysis of flow measurement systems follows similar steps used for the flow meters analysis. The unitary classification includes both full closed conduits flow measurement systems as well as flow measurement systems for partially filled conduits, respectively to hydrometry. A group of flow measurement systems uses transit time method with injection of tracer, which is one of the velocity-area methods. According to this method, the tracer is used to highlight and measure the fluid velocity. The chapter discusses that one way to use tracers for measuring flow rate is applying "the tracer dilution methods" at the base of the systems. Finally, the chapter presents, based on the identification of all variants of analytical expressions of the flow rate, i.e., of the related structural schemes, the unitary classification of the flow measurement systems.
