Apparatus for determining and/or monitoring at least one process variable

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

• a mechanically oscillatable unit, which executes mechanical oscillations in at least one direction and which is secured at a seating;
• an exciting/receiving unit, which excites said mechanically oscillatable unit to mechanical oscillations and which receives the mechanical oscillations of said mechanically oscillatable unit;
• and
• a control/evaluation unit, which controls the mechanical oscillations of said mechanically oscillatable unit and which, with the mechanical oscillations of said mechanically oscillatable unit, determines and/or monitors the process variable;
• and
• at least one compensating mass which is mechanically coupled with said mechanically oscillatable unit and which is embodied and/or secured in such a manner that it executes mechanical oscillations in at least one direction, wherein:
• the direction of the oscillations of said compensating mass is essentially perpendicular to the direction of the oscillations of said mechanically oscillatable unit, and
• said compensating mass is mechanically coupled with said mechanically oscillatable unit via at least one spring element.

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

• a mechanically oscillatable unit, which executes mechanical oscillations in at least one direction and which is secured at a seating;
• an exciting/receiving unit, which excites said mechanically oscillatable unit to mechanical oscillations and which receives the mechanical oscillations of said mechanically oscillatable unit;
• and
• a control/evaluation unit, which controls the mechanical oscillations of said mechanically oscillatable unit and which, with the mechanical oscillations of said mechanically oscillatable unit, determines and/or monitors the process variable;
• and
• at least one compensating mass which is mechanically coupled with said mechanically oscillatable unit and which is embodied and/or secured in such a manner that it executes mechanical oscillations in at least one direction, wherein:
• the direction of the oscillations of said compensating mass is essentially perpendicular to the direction of the oscillations of said mechanically oscillatable unit, and
• said compensating mass has at least one internal cavity which surrounds said exciting/receiving unit.