Water level control system using silicon controlled rectifier

The purpose of this paper is to analyse a circuit of system water level control system using a Silicon Controlled Rectifier (SCR) as an active component. WLC circuit is composed of the SCR that is connected to the NPN transistor 2, the relay is connected with a lamp 5 watt / 220 volt electric motor as a simulator. Detection of water uses a sensor that consists of three sensors namely S1, S2, and S3 in the water tank. The experimental results indicate that when water touches the S3 then lights on / simulator motor works with Vbe transistor1 voltage at 0.4 volts, the voltage at the Vbe transistor2 0 volts and the voltage on the SCR Vak of 0.4 volts. The lamp to simulate an electric motor simulator will be off if S1 touched the water with transistor1 Vbe voltage at 0.4 volts, the voltage at the Vbe transistor2 of 1.8 volts and the voltage on the SCR Vak 0.75 volts.