Automatic orifice calibrator

摘要

An orifice is calibrated by passing air through the orifice and into a tube carrying a water column. The rate at which the water in the water column falls due to the passage of air through the orifice is measured to find the volumetric flow and elapsed time of air passing through the orifice. A computer is then used to subject the volumetric flow and elapsed time data to a regression analysis to produce an equation of displacement as a function of elapsed time. The first derivative of this equation is the flow rate. A correlation coefficient of the equation is printed, and the volumetric and mass flow rates may be printed if desired.