The general objective of the present thesis was: implementing a system automated for the filling and draining of a liquid in a cylindrical horizontal tank; determining firstly the relation between the volume with the level of liquid, which made suitable itself and programmed in Microsoft Excel 2023 to determine the initial volume and the experimental value of the final volume of liquid. The implementation of the automated system was the following: a programmable relay, two push-buttons NC, two push-buttons NO, two lights led, a thermic key with its bipolar plug, a viewfinder with gauged rule, a line filling (shaped for spans of piping and accessories, the electric pumps filling and a meter of volume) and a line draining (shaped for spans of piping and accessories, the electric pumps draining and a meter of volume). Straightaway, became elaborate the diagram ladder for the automatic contr...