The article describes a vibrohopper loading sensor. Its work is based on the phenomenon of changes in the oscillations amplitude of a bowl when the number of uploaded details is changing. The sensor consists of an elastic plate, a lever rotating around an axis, and a hermetic contact. Some quantitative ratios that characterize the sensor design parameters are considered. Guidelines for choosing the main geometrical dimensions of the sensor element and the lever controlling a state of the hermetic contact are given.