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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.
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