The objectify general of the present investigation it was: accomplishing the improvement of the team for the liquids drain in conical tanks, by means of the development of a system automated; being deduced firstly the intervening mathematical model which determined the passage of time to drain a certain quantity of liquid volume in conical tanks itself, Being applicable ad hoc the equation of continuity and the general equation of energy. From now on, the frame-up of the automated system came true, which was shaped by the following components: A programmable relay, the software Zelio Soft2 V5.4.2, the interface of communication, a valve solenoid, a red push-button NC, a green push-button NA, an indicating rookie pilot and a thermic key with its bipolar plug. At last, when moved in the aforementioned system automated in the conical tank, eight (8) performance testings, in the same ones th...