A capacitive transducer is developed for online monitoring of the in-mold material status for injection molding, particularly for measurements of melt-front position and flow-rate. This paper will show, in addition to fulfilling its design purposes, that such a sensor can also be effectively used for the detection of the start and end of mold filling, the time of gate freezing, and over-packing. (C) 2004 society of Plastics Engineers.