An intelligent flow measuring technique using venturi

This paper aims to design an intelligent flow measuring instrument. The objectives of this work are (i) to extend the linearity range of venturi and (a) to eliminate the dependency of venturi to pipe diameters ratio, (b) the dependency of liquid density, and (c) the effect of liquid temperature on the output. The output of venturi is differential pressure, which is converted to voltage by using data conversion unit. An ANN block is added in cascade to the data conversion unit. This arrangement helps to linearise the overall system and makes it independent of ratio between venturi to pipe diameter, liquid density and temperature. Since the proposed intelligent flow measuring instrument produces output independent of liquid density, temperature and ratio between venturi to pipe diameter, the proposed work avoids the requirement of repeated calibration when any or a combination of the liquid and parameters are changed.