Water pump controller how it works
1. On left side of circuit there are three SPST which wich is act as conductive type level sensor.
2. From left first sensor is for high level middle for middle level and right one is for low level when tank is Full all sensors are connected that means all SPST switch are close when tank level goes below high level sensor first sensor means SPST switch open
3. When water level goes below high pump started
