It is a simple Low cast level controller for the detection of conductive liquids , it is also useful for low densities , high viscosities containing solid particles and interfaces between nonconductive liquids, In this level switch , One probe for common electrode while other one or multiple control electrodes depending up on the number of levels to be controlled all the electrodes are suitable insulated to avoid electrical bridging some times if tank itself is conductive it can be used as a common electrodes than number of control electrodes equals to the number of presser levels level controller having consist of power supply and signal conditioning circuits which gives a low ac voltage across common electrode and control electrodes . Once liquid reaching at preset level point , electrical circuit gets completed and generate a signal which is amplified to actuate a relay , whose potential free contacts are available for subsequent operations . On level falling 7the circuit breaks  cutting out the relay.