In this thesis study, a prototype is designed in order to improve the weighing accuracy of the weighing and packaging machine that used in sugar factories. The unavoidable factory conditions cause weighing and packaging machine to do weighing errors. In order to correct these errors, the prototype produced in this study was designed as a quality control unit which will take the excess sugar and fill the deficient sugar in the sacks. Because of being small and having an easy installation, the application of the prototype was done considering 1-kilogram bags rather than available 50-kilogram ones. So as to correct the faulty weighing, sugar extraction and filling processes are provided from a bunker which is designed on the basis of data obtained by statistical analysis. For suction, vacuum is used and filling is realized by a ball valve. Upwards and downwards movement of the bunker is carried out with a pneumatic cylinder. Weighing information is received via a load cell and an indicator. Control of all these devices is provided by PLC hardware and SCADA interface.