Patent ID: 7530268

Claim:
An apparatus for determining and/or monitoring at least one physical or chemical process variable of a medium, comprising: at least one mechanically oscillatable unit which includes a tube and an internal oscillator, said tube having a first end and a second end; a securement unit connected to said first end of said tube, said first end of said tube being turned away from the process, and said second end of said tube being turned toward the process and embodied as a free end, said tube surrounds said internal oscillator; and at least one driving/receiving unit, said driving/receiving unit excites said at least one mechanically oscillatable unit to oscillate, respectively, wherein: said internal oscillator is secured to said free end of said tube by an end turned toward the process; said driving/receiving unit receives the oscillations of said at least one mechanically oscillatable unit; said internal oscillator has at least one groove/neck, which determines at least the oscillation frequency of said at least one mechanically oscillatable unit; the resonance frequency of said tube is smaller than the resonance frequency of said internal oscillator; and as a result any effect by said tube on the oscillation frequency of said at least one mechanically oscillatable unit is negligible.