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The measuring hopper is mounted on a platform scale (frame structure equipped with precision sensors). When the feeder is running, the motor drives the feeding screw or pump to move. At the same time, the material in the measuring hopper flows out. By reducing the weight in the unit time, obtain the actual feeding amount, compare it with the set feeding amount to get the error value, and then adjust the speed of the feeding motor through the PID closed-loop control algorithm to achieve the precise feeding
Schematic Diagraph of Loss-in-weight weighing feeder
requirements. This process ensures an accurate feeding or dosing during the production process.

The general purpose of Loss in Weight feed system is to accurately weigh and control the output of variable products either, continuously or as a batch. As the name suggests, the Loss in Weight concept is primarily based around the application of a weigh system allied to PLC control, the outline specification for the system shown below. Whilst the weigh function is at the heart of any Loss in Weight system it does not directly impact on the material flow, therefore, the correct design of the storage vessel and the choice of a suitable material transfer is critical and is reflected in the options available.