Production control system Halo is a device equipped of an accurate software, able to measure instantaneously the productivity of the feeding line. The system measures exactly the material loaded by the receiver and memorizes data for future data analysis. However, it works as a totalizer: an operator can set a value and the system monitors it constantly. Halo when installed on the hopper loader checks the material consumption and adjusts the dryer airflow: this allows the maximization of the energy saving.