Hopper Level Sensor is used to drive the vibration fork and feedback signal, when produces the resonation on the fork. When the fork comes into contact with material, the fork will release some frequency signal. It will be converted into the output to the signal. The vibrating frequency causes tuning forks to vibrate free inside the tank when forks are not covered with any media. Once the media covers the tuning forks, it causes damp-ing of vibrations. The damping effect of vi-brating forks is sensed by an equal circuitry which in turns gives an output electronic signal which in turn actuates a relay.