River Flow Measurement using Salt Gulp Conductivity

Abstract

A meter has been built in order to measure the volume flow rate of water through a river. A known quantity of salt should be thrown into the river upstream of the meter, then the meter automatically measures flow by integrating conductivity until it returns to normal and taking the reciprocal. The meter comprises an Intel 87C51 microcontroller which reads measurements from the display driver lines of a conventional conductivity meter, performs the integration, then displays the result on a separate liquid crystal display.