ABSTRACT
This chapter discusses the conventional flow meters that consist of two serial elements: the Primary Element (PE) and the Secondary Element (SE). The essential reason in the identification and analysis of the functional logic of all basic types of flow meters was that every basic type of flow meter, i.e., method of flow measurement, ensures the modeling of a basic defining equation of the flow rate. Conventional analytical expressions have been the first ones chronologically elaborated, and they are used for most basic types of flow meters. These unconventional analytical expressions are obtained using the analytical processing of the conventional analytical expressions of the flow rate, consequently resulting in analytical expressions being unconventional complex. Unconventional flow measurement based on the local velocity can be achieved in two ways: Depending on a local velocity, and Depending on several local velocities.
