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To manage your alert preferences, click on the button below. Manage my AlertsA material charging system is a critical process in a blast furnace. Raw materials are transported from the stock house to the top of furnace and distributed into the furnace. To put defined amounts of materials into the preset position, the control and detection of angular positions of flow control valves and the distributing chute on the top of the furnace is crucial. A synchro transmitter, used in combination with a synchro indicator, provides remote indication and control of the opening of valves, gates, dampers, and mobile equipment. In the proposed system, the synchro transmitter outputs a three-phase signal. The signal is finally transformed into a digital angular signal. By appropriate PLC control codes, the signal is a mapping of real mechanical angles or traveling length for operation and control. As a real application in a blast furnace, it is proved a robust, environment insensitive and stable solution of angle measurement and process control.