The invention describes a vibrating tine level detection device, and a method of forming the same, which is particularly suitable for operation in environments subject to rapid temperature change. A piezoelectric stack, which generates vibration of the tine, is located within a cage. The cage is, in turn, located within a hollow body defined by a diaphragm, from which the tines extend, and a wall section. The cage is attached to the inside surface of the wall section, adjacent to the junction between the wall section and the diaphragm. As a consequence, the ability of the cage to maintain a substantially constant compression on the piezoelectric stack is substantially unaffected by thermal expansion or contraction of the wall section.