Apparatus for determining and/or monitoring a process variable

Apparatus for determining and/or monitoring at least one process variable of a medium, comprising:

• at least one housing;
• at least one mechanically oscillatable unit;
• at least one transducer unit, which excites said at least one mechanically oscillatable unit to execute mechanical oscillations, and which receives mechanical oscillations from said at least one mechanically oscillatable unit;
• and:
• at least one equalizing element, wherein:
• said at least one transducer unit is arranged and clamped between said at least two clamping elements of said at least one housing in such a manner that, at least along an imaginary axis, a predeterminable pressure acts on said at least one transducer unit;
• a coefficient of thermal expansion of said at least one equalizing element and/or a height of said at least one equalizing element along the imaginary axis are/is selected in such a manner that a temperature-related expansion of said at least one equalizing element along the imaginary axis during a temperature-related expansion (along the imaginary axis) of a housing element to be compensated leads to the fact that pressure acting along the imaginary axis on said transducer unit is essentially greater than or equal to a predeterminable prestress limit value;
• and
• the temperature-related expansion (along the imaginary axis) of said housing element to be compensated affects distance along the imaginary axis between two housing elements, between which said at least one transducer unit is arranged and clamped.