Orifice plates, nozzles and Venturi tubes are designed for measurement of superheated or saturated steam, fluids or gaseous mixtures. The method of measurement is based on pressure differences, so-called pressure differential, which arise during the flow of measured medium through tapering section. Immediate fluid flow is (except for small non-linearity) proportional to root of differential pressure.
The pressure differences are conversed into electric signal in the pressure differential device. This signal is processed in the evaluation unit or in the superiority system together with the temperature and pressure data in the real time. This method of measurement provides results of volume, event. energy of the medium flow.
Calculation of the measurement resides in the solution of Bernoulli equation and the equation of flow continuity and in equations determined on basis of experimental measurement.
