Simultaneous Measurement of Fluid Level and Flow in Gravity Tanks using Ultrasonic Sensors

Abstract

Modern instruments for level measurement are becoming more sophisticated making them too expensive to some simpler applications. In order for the procurement of these instruments become more cost effective, we need to utilize their added features to other possible applications. This study presents the results of an experimental investigation involving the use of an existing ultrasonic level sensor for simultaneous level and flow measurements in gravity tanks. The experiment utilizes the data logging feature of the ultrasonic level sensor to log the instantaneous tank level and a sample discharge fitting as the variable head flow meter. The results showed that the values of coefficient of discharge (Cd) corresponding to the sample discharge fitting used can be determined accurately using an open tank draining model as proven by Torricelli’s Law. Instantaneous values of coefficient of discharge (Cd) are then used to determine the discharge of the tank.