Automatic water-level controller for overhead tanks that switches on/off the pump motor when water in the tank goes below/above the minimum/maximum or medium level. The water level is sensed by three floats to operate the switches for controlling the pump motor.
Each sensors float is suspended from above using an aluminium rod. This arrangement is encased and fixed vertically on the inside wall of the water tank. Sensor 1 senses the minimum water level, while sensor 2 senses the maximum water level.