In India, many manufacturers manufacture automatic water level controllers, offering different features and quality—Greenstark Electronics is one of the top brands in India. they offer automatic water level controllers for submersible pumps. the benefit of this controller is that saves the pump from unwanted electrical errors i.e. Low voltage, High voltage, overload, and Dry run.
the basic working of an automatic water level controller is to operate the pump automatically depending on the tank water level. means if in tank water level goes low, the pump starts automatically. and when the tank is full the pump stops automatically.
but this function is not sufficient for pumps the controller should know about voltage current and water flow during the running of the pump.