Patent ID: 7562586

Claim:
An inline measuring device for measuring at least one physical, measured variable of a medium conveyed in a pipeline, comprising: a measurement pickup of vibration-type; and measuring device electronics electrically coupled with said measurement pickup, wherein: said measurement pickup includes: at least one, essentially straight, measuring tube serving for the conveying of the medium to be measured and for communicating with the connected pipeline; an exciter mechanism acting on said at least one measuring tube for causing said at least one measuring tube to vibrate during operation with torsional oscillations about a torsional oscillation axis imaginarily connecting an inlet end of said measuring tube and an outlet end of said measuring tube; and a sensor arrangement for registering vibrations of said at least one measuring tube and delivering at least one oscillation measurement signal (s 1 , s 2 ) representing oscillations of said measuring tube, further wherein: said measuring device electronics delivers, at least at times, an exciter signal driving said exciter mechanism, generates by means of one of: the at least one oscillation measurement signal and by means of the exciter signal at least at times, at least one measured value, which represents the at least one physical, measured variable to be measured; and said measuring device electronics determines, on the basis of the at least one oscillation measurement signal and/or on the basis of the exciter signal repetitively, an oscillation frequency, of the torsional oscillations of said measuring tube, and, based on the oscillation frequency, of the torsional oscillations, monitors at least one operating condition of said at least one measuring tube.