Patent ID: 7216549

Claim:
A vibration-type measurement transducer for measuring a flowable medium conveyed in a pipeline, especially a gas, liquid, powder or other flowable substance, comprising: a transducer housing, which exhibits a multiplicity of natural oscillation modes; at least a one measuring tube for conveying at least a volume fraction of the medium to be measured, said at least one measuring tube being held oscillatably in said transducer housing and vibrating, at least at times; an electromechanical exciter mechanism acting on said at least one measuring tube for producing and/or maintaining mechanical oscillations of said at least one measuring tube; a sensor arrangement reacting to movements of said at least one measuring tube for producing at least one oscillation measurement signal representing oscillations of said at least one measuring tube; and at least a one support element fixed to said transducer housing and serving for the formation of essentially locationally fixed oscillation nodes in said transducer housing for suppressing and erasing at least one natural oscillation mode of the transducer housing, respectively, wherein: an outer oscillation system of the measurement transducer is formed by said transducer housing and at least said at least one support element and an inner oscillation system of the measurement transducer is formed by said at least one measuring tube, the medium at least instantaneously conveyed therein, and, at least in part, by said electromechanical exciter mechanism and said sensor arrangement; and said inner oscillation system, driven by said exciter mechanism, executes, at least at times during operation of the measurement transducer, mechanical oscillations having at least one wanted oscillation frequency, said at least one wanted oscillation frequency being both dependent on size, form and material of said at least one measuring tube as well as also on an instantaneous density of the medium, and said at least one wanted oscillation frequency being variable within a predetermined, wanted, frequency band, during operation of the measurement transducer, said frequency band having a lower limit frequency and an upper limit frequency.