The Loss in Weight Feeder is a precision dosing system used for the controlled, continuous feeding of powdered, granular, and bulk materials at an accurate mass flow rate in industrial processes. The unit consists of a conical-cylindrical hopper for temporary material storage, an internal agitator at the upper section of the hopper to prevent material bridging and ensure a smooth, uniform flow toward the outlet, a screw feeder unit connected to a gearbox motor at the conical end of the hopper for precise, controlled material discharge, a flanged inlet for hopper refilling, and a lower structural frame equipped with load cells at the foundation connection points for continuous weighing of the entire assembly.

Operation is based on real-time monitoring of the hopper's weight loss: load cells mounted at the base of the frame continuously measure the total weight of the assembly, including the hopper and its material content. At the same time, the internal agitator rotates slowly within the hopper to prevent material compaction or air-pocket formation, ensuring a consistent flow of material toward the feed screw. The screw feeder rotates to discharge material at a precise, adjustable rate through the conical outlet, while the control system continuously calculates the rate of weight loss over time to adjust the screw speed and maintain the discharge mass flow rate at the setpoint. When the material level reaches a low threshold, the hopper is automatically or semi-automatically refilled. Due to its very high dosing accuracy, prevention of flow-interruption fluctuations, and stability in continuous processes, this type of feeder is widely used in industries such as cement, petrochemical, food, and chemical processing for the precise feeding of additives and raw materials.