The ultrasonic probe of the present invention includes an ultrasonic element unit for transmitting and receiving ultrasonic waves, an oscillation mechanism for causing oscillation to the ultrasonic element unit and a detector for detecting the oscillation of the ultrasonic element unit. An interior part, non-rotatably connected with the camshaft, has at least approximately radially extending webs or vanes. If a DRC lock bit is available, then an accumulated total credit is authorized to produce an authorized accumulated total credit. Use of the present invention on conventional conveyor belts controls the dispersion of the particulate material carried thereon and allows for the speed of the conveyor to be increased. The compound demonstrates long term stability in vivo under reductive environment. A capacitance-to-digital converter may be coupled to the proximity sensor by inductors.