A sensor assembly for a Coriolis mass flowmeter includes an upstream pipe connection connected to an upstream fluid pipe and a downstream pipe connection connected to a downstream fluid pipe. The sensor assembly installed in a shell of the flowmeter includes a fluid flow pipe, having a fluid input pipe, a fluid output pipe and a double-loop pipe connected in series therebetween; a vibration isolated structure, at least comprising first vibration isolators fixedly arranged on the fluid flow pipe to separate the fluid flow pipe into vibrating pipes and non-vibrating pipes; a weight-increasing structure, arranged on the non-vibrating pipes without contact with the shell; and a connecting structure, fixedly connected to the non-vibrating pipes on one end and to the upstream pipe connection and/or downstream pipe connection on the other to form a flexible connection therebetween.

The invention relates to a Coriolis flow sensor. The sensor comprises a housing and at least a Coriolis-tube with at least two ends being fixed in a tube fixation means. The flow sensor comprises excitation means for causing the tube to oscillate, as well as detection means for detecting at least a measure of displacements of parts of the tube during operation. According to the invention, the Coriolis flow sensor comprises a reference mass, as well as further excitation means arranged for causing the reference mass to oscillate during operation, as well as further detection means for detecting at least a measure of displacements of the reference mass during operation. Additionally, control means are provided for controlling the excitation means and/or further excitation means based on vibrations measured by the detection means and/or further detection means. This way a Coriolis flow sensor with active vibration isolation is obtained.

A flowmeter having one or more conduits (103, 103) and a driver (104) coupled to one or more conduits (103, 103) being configured to vibrate at least a portion of the conduit at one or more drive frequencies. One or more pickoffs (105, 105) are coupled to the one or more conduits (103, 103) and are configured to detect a motion of the conduit. A housing (200) has a first compartment (400) and a second compartment (402). The first compartment (400) is fluid-tight and encloses at least a portion of the one or more conduits (103, 103), the driver (104), and the one or more pickoffs (105, 105). A sealable fill port (418) is configured to allow the addition of a ballast material to the second compartment (402).

A method is provided comprising the steps of exciting a vibration mode of a flow tube (130, 130), wherein first and second drivers (180L, 180R) are amplitude modulated out of phase from each other, and wherein a drive command provided to the first and second drivers (180L, 180R) comprises a sum of N+1 independent signals. The first and second drivers (180L, 180R) are excited with a plurality of off-resonance frequencies and the effective phase between a modal response and the drivers (180L, 180R) at each of the off-resonance frequencies is inferred. A left eigenvector phase estimate is generated for each of the off-resonance frequencies. A phase of a left eigenvector at a resonant drive frequency is estimated based on off-resonance frequency phase estimates. The method also comprises measuring the phase between a first pickoff (170L) and a second pickoff (170R) and determining a phase of a right eigenvector for the flow tube (130, 130).

A Coriolis mass flow meter includes: a measuring tube for guiding a medium; a support body connected to the measuring tube on the inlet side and on the outlet side; an exciter for exciting bending vibrations of the measuring tube; at least two vibration sensors for detecting vibrations of the measuring tube; and a reinforcing body fastened to a lateral surface of the measuring tube and surrounds the measuring tube, the reinforcing body including, at least in sections, a helical course with a plurality of windings, a distance between two adjacent windings of the reinforcing body being not less than twice, for example, not less than four times or not less than eight times, a material thickness of the reinforcing body in the region of the windings.

The viscometer provides a viscosity value (X.sub.0) which represents the viscosity of a fluid flowing in a pipe connected thereto. It comprises a vibratory transducer with at least one flow tube for conducting the fluid, which communicates with the pipe. Driven by an excitation assembly, the flow tube is vibrated so that friction forces are produced in the fluid. The viscometer further includes meter electronics which feed an excitation current (i.sub.exc) into the excitation assembly. By means of the meter electronics, a first internal intermediate value (X.sub.1) is formed, which corresponds with the excitation current (i.sub.exc) and thus represents the friction forces acting in the fluid. According to the invention, a second internal intermediate value (X.sub.2), representing inhomogeneities in the fluid, is generated in the meter electronics, which then determine the viscosity value (X.sub.0) using the two intermediate values (X.sub.1, X.sub.2). The first internal intermediate value (X.sub.1) is preferably normalized by means of an amplitude control signal (y.sub.AM) for the excitation current (i.sub.exc), the amplitude control signal corresponding with the vibrations of the flow tube. As a result, the viscosity value (X.sub.0) provided by the viscometer is highly accurate and robust, particularly independently of the position of installation of the flow tube.

An embodiment of a balance bar (230) is disclosed. The balance bar (230) comprises a first side portion (231) having a hollow interior for receiving a flow tube (220), a central portion (233) having a hollow interior for receiving a flow tube (220), and a first side flexible portion (234) comprising at least one flexible coupler (250), the first side flexible portion (234) coupling the first side portion (231) with the central portion (233), wherein the first side portion (231) and the central portion (233) are both more rigid than the first side flexible portion (234).

A transducer assembly 200 for a vibrating meter 5 having meter electronics 20 is provided according to an embodiment. The transducer assembly 200 comprises a coil portion 204A comprising a coil bobbin 220 and a coil 222 wound around the coil bobbin 220. A magnet portion 204B comprises a magnet. The coil portion 204A and the magnet portion 204B are constrained in both the x and y axis of travel, such that the coil portion 204A is prevented from colliding with the magnet portion 204B.

The measuring transducer comprises a measuring tube having an inlet-side tube end and an outlet-side tube end, a tube wall having a predetermined wall thickness and a lumen surrounded by the tube wall and extending between the first and second tube end, a support element, which with a support end is mechanically connected with the tube end and with a support end is mechanically connected with the tube end, as well as, laterally spaced from the measuring tube, a support element, which with a support end is mechanically connected with the support end and with a support end is mechanically connected with the support end. The measuring tube of the measuring transducer is adapted to guide a flowing medium in its lumen and during that to be caused to oscillate about a static resting position for producing Coriolis forces. The measuring transducer comprises an oscillation exciter as well as at least one oscillation sensor. The measuring transducer has a wanted mode having a resonant frequency, in which the measuring tube can execute wanted oscillations around its static resting position suitable for producing Coriolis forces and having a wanted frequency corresponding to the resonant frequency of the wanted mode. The oscillation exciter is, furthermore, adapted to excite the wanted oscillations of the measuring tube, and the oscillation sensor, of which one sensor component is placed externally on the measuring tube and one sensor component is placed on the support element, is adapted to register movements of the measuring tube relative to the support element and to convert such into an oscillatory signal representing oscillations of the measuring tube.

A measuring transducer comprises a measuring tube having an inlet-side tube end and an outlet-side tube end, a tube wall having a predetermined wall thickness and a lumen surrounded by the tube wall and extending between the first and second tube end, a support element, which with a support end is mechanically connected with the tube end and with a support end is mechanically connected with the tube end, as well as, laterally spaced from the measuring tube, a support element, which with a support end is mechanically coupled with the support end and with a support end is mechanically coupled with the support end. The measuring tube is adapted to guide a flowing medium in its lumen and caused to oscillate about a static resting position for producing Coriolis forces. An oscillation exciter as well as at least one oscillation sensor. The measuring transducer has a wanted mode having a resonant frequency, in which the measuring tube can execute wanted oscillations around its static resting position suitable for producing Coriolis forces and having a wanted frequency corresponding to the resonant frequency of the wanted mode. The oscillation exciter is placed externally on the measuring tube and one exciter component is placed on the support element, is, furthermore, adapted to excite the wanted oscillations of the measuring tube, and the oscillation sensor, of which one sensor component is placed externally on the measuring tube and one sensor component is placed on the support element, is adapted to register movements of the measuring tube relative to the support element and to convert such into an oscillatory signal representing oscillations of the measuring tube.