VIBRATION LEVEL SENSOR

摘要

A vibration level sensor comprises a mechanically oscillating structure (8) having at least two oscillation rods (4, 5) that are oppositely attached to a membrane (3) at locations between its center (6) and its edge (7), a housing (1) which is at one side closed by said membrane (3), and an electro- mechanical transducer (9) arranged in said housing (1) to move, on electrical excitation, the center (6) of the membrane (3) in order to cause the oscillation rods (4, 5) to perform opposite oscillations perpendicular to their longitudinal axis. To provide a vibration level sensor which can be operated in a wide range of temperature and variety of materials, the electromechanical transducer (9) is, at a side facing away from the membrane (3), supported by a support member (12) within said housing (1), and a vibrational energy concentrating element (14) of solid material which is tapered from a larger diameter at a first end to a smaller diameter to a second end is arranged between the electromechanical transducer (9) and the membrane (3) with the first end being in plane contact with a side of the electromechanical transducer (9) facing toward the membrane (3) and the second end being in contact with the center (6) of the membrane (3).