Measuring Transducer of Vibration-Type

Abstract

A measuring transducer for registering and/or monitoring at least one process variable of a flowable medium guided in a pipeline, which at least includes: a housing module, which is mechanically coupled with the pipeline via an inlet end and an outlet end, and a sensor module having at least one measuring tube held oscillatably at least partially in the housing module and caused, at least at times, to oscillate. The at least one component of the housing module and/or of the sensor module is manufactured by means of a generative method and method for manufacturing at least one component of a measuring transducer, which method includes manufacturing the at least one component by means of a primary forming process, especially by means of a layered applying and/or melting-on of a powder, especially a metal powder, based on a digital data set, which gives at least the shape and/or the material and/or the structure of the at least one component.

Claims

1-40. (canceled)

41. A measuring transducer of a vibration-type, especially for registering and/or monitoring at least one process variable of a flowable medium guided in a pipeline, which measuring transducer, comprises: a housing module, which is mechanically coupled with the pipeline via an inlet end and an outlet end; and a sensor module having at least one measuring tube held oscillatably at least partially in said housing module and caused, at least at times, to oscillate, wherein: at least one component of said housing module and/or of said sensor module is manufactured by means of a generative method.

42. The measuring transducer as claimed in claim 41, further comprising: at least one electromechanical, especially electro-dynamic, exciter mechanism acting on said at least one measuring tube for producing and/or maintaining mechanical oscillations of said at least one measuring tube; at least one vibration sensor arrangement reacting to oscillations of said at least one measuring tube for producing at least one oscillatory measurement signal representing oscillations of said at least one measuring tube, wherein: said at least one exciter mechanism and said at least one vibration sensor arrangement are secured externally to said at least one measuring tube.

43. The measuring transducer as claimed in claim 41, wherein: at least the wall thickness, and/or the stiffness, and/or the mass distribution and/or the density of said at least one component vary/varies, especially heterogeneously, in a direction parallel to the flow direction of the medium.

44. The measuring transducer as claimed in claim 41, wherein: said wall of the at least one component has, at least externally, at least in a portion, a profile, especially comprising one of: a groove profile, a jagged profile or a tooth profile.

45. The measuring transducer as claimed in claim 43, wherein: there is integrated within said wall of said at least one component at least one capsule enclosing powder, and/or at least one hollow space.

46. The measuring transducer as claimed in claim 43, wherein: there is integrated within said wall of said at least one component at least one hollow duct or in at least one portion within said wall an open pored structure, comprising one of: a porous structure or a beehive structure.

47. The measuring transducer as claimed in claim 42, wherein: said at least one measuring tube is manufactured by means of the generative method.

48. The measuring transducer as claimed in claim 47, wherein: at least one connecting piece for securement of at least one component of said exciter mechanism and/or said vibration sensor arrangement is placed externally of said wall of said at least one measuring tube; and said at least one connecting piece and said wall of said at least one measuring tube are manufactured together by means of the generative method.

49. The measuring transducer as claimed in claim 47, wherein: the cross sectional area of said at least one measuring tube is one of: round, star-shaped, square, oval, or circular segment shaped, especially D-shaped; and/or cross sectional area of said at least one measuring tube varies in a direction parallel to the flow direction of the medium with reference to surface area and surface form.

50. The measuring transducer as claimed in claim 47, wherein: there is integrated in the interior of said wall of said at least one measuring tube at least one flow forming module, especially introduced into the inner wall surface, a lamella, a flow rectifier or a filter, or at least one partition, which divides the internal volume into at least two regions; and said wall of said at least one measuring tube and said at least one flow forming module are manufactured together by means of the generative method.

51. The measuring transducer as claimed in claim 47, further comprising: at least one bypass line, through which a portion of the flowing medium flows, wherein: said wall of said at least one measuring tube and said at least one bypass line are manufactured together by means of the generative method.

52. The measuring transducer as claimed in claim 47, wherein: there is arranged in the interior of said wall of said at least one measuring tube at least one structure, especially a strut or a band, which structure is secured to two contact areas on said inner wall of said at least one measuring tube.

53. The measuring transducer as claimed in claim 47, wherein: said at least one measuring tube is at least sectionally significantly curved, especially embodied in U-, V-, trapezoid-, or helical shape.

54. The measuring transducer as claimed in claim 47, wherein: there is arranged externally on said wall of said at least one measuring tube at least one mass element, which is secured by means of at least one securement unit especially a strut extending parallel or perpendicular to the flow direction of the medium; a ring extending radially around said wall of said at least one measuring tube, or a fin extending along said wall of said at least one measuring tube parallel to the flow direction, in such a manner that at least one of said two contact areas between said at least one securement unit and said at least one mass element; and/or said at least one securement unit and the external region of said wall of said at least one measuring tube is minimal; and said at least one measuring tube, said at least one mass element, and said at least one securement unit are manufactured together by means of the generative method.

55. The measuring transducer as claimed in claim 47, wherein: at least two fins are placed externally on said wall of said at least one measuring tube on oppositely lying sides of said at least one measuring tube; and said at least one measuring tube and said at least two fins are manufactured together by means of the generative method.

56. The measuring transducer as claimed in claim 47, wherein: said sensor module includes at least: a single measuring tube; and two process connections; said measuring tube and at least one of said two process connections are manufactured together by means of the generative method.

57. The measuring transducer as claimed in claim 56, further comparison: a vibration absorbing tube, wherein: said vibration absorbing tube and said at least one measuring tube are manufactured together by means of the generative method.

58. The measuring transducer as claimed in claim 57, wherein: said vibration absorbing tube has a greater diameter than said measuring tube; and said measuring tube is arranged contactlessly, especially coaxially, in the interior of said vibration absorbing tube.

59. The measuring transducer as claimed in claim 47, wherein: said sensor module includes at least: said at least two measuring tubes; two distributor pieces, which distribute the flowing medium from the pipeline into said inlet ends of said at least two measuring tubes and bring the flowing medium back together at said outlet ends of said at least two measuring tubes, and thus connect the pipeline and said at least two measuring tubes; and two process connections; said at least two measuring tubes and at least one of said distributor pieces or said at least two measuring tubes, said two distributor pieces and at least one of said process connections are manufactured together by means of the generative method.

60. The measuring transducer as claimed in claim 59, further comprising: at least two coupling elements, which couple said at least two measuring tubes with one another at least at said inlet end and at said outlet end; and said at least two measuring tubes and said at least two coupling elements are manufactured together by means of the generative method.

61. The measuring transducer as claimed in claim 59, wherein: each of said two distributor pieces has a multiply branched, continuous, internal volume.

62. The measuring transducer as claimed in claim 41, wherein: at least one component of said housing module is manufactured by means of the generative method.

63. The measuring transducer as claimed in claim 41, wherein: a filling, especially a filling with a porous structure or beehive structure, is arranged in at least a part of the interior of at least one component of said housing module; and said filling is either introduced subsequently into the at least one component of said housing module, or said filling and said at least one component of said housing module are manufactured together by means of the generative method.

64. The measuring transducer as claimed in claim 62, further comprising: at least one component of an electronics unit, especially a housing; at least one electrical feedthrough and/or a mechanical transition piece, especially an Ex-protection feedthrough, is manufactured together with at least one component of said housing module by means of the generative method.

65. The measuring transducer as claimed in claim 62, wherein: said housing module includes a support, with which said at least one measuring tube is mechanically connected inlet end and outlet end, and a casing, which surrounds said at least one measuring tube.

66. The measuring transducer as claimed in claim 65, wherein: at least said support and/or at least one of said process connections and/or at least one of the distributor pieces are manufactured together by means of the generative method.

67. The measuring transducer as claimed in claim 65, wherein: said support is embodied as a laterally at least partially open, especially tubular, support cylinder, which is connected with said at least one measuring tube in such a manner that said measuring tube protrudes partially laterally out of the support cylinder.

68. The measuring transducer as claimed in claim 41, further comprising: at least one other sensor element is integrated in at least one of the subcomponents of said housing module; and/or said sensor module for registering an additional process variable, especially temperature or pressure; and said at least one component of the housing module or sensor module and at least one component of said additional sensor element are manufactured together by means of the generative method.

69. The measuring transducer as claimed in claim 41, wherein: at least one component of said housing module and/or of said sensor module is manufactured of a metal, especially stainless steel or tantalum, a composite material, especially a fiber composite material, a glass or a synthetic material.

70. The measuring transducer as claimed in claim 41, further comprising: a coating is applied, especially melted or welded, on at least one portion of at least one surface of at least one component of said housing module and/or of said sensor module, especially for preventing corrosion, abrasion and/or accretion formation.

71. The measuring transducer as claimed in claim 41, wherein: the at least one process variable is mass flow, density, or viscosity of the medium.

72. A method for manufacturing at least one component of a measuring transducer of a vibration-type, especially for registering and/or monitoring at least one process variable of a flowing medium guided in a pipeline, the measuring transducer at least includes: a housing module, which is designed to be coupled mechanically with the pipeline via an inlet end and an outlet end, and a sensor module having at least one measuring tube held oscillatably in said housing module and caused to oscillate, at least at times, the method comprises: manufacturing the at least one component by means of a primary forming process, based on a digital data set, which gives at least shape and/or material and/or structure of the at least one component.

73. The method as claimed in claim 72, wherein: for determining shape and/or structure and/or material of the at least one component, the geometry, mass distribution, and/or stiffness of the at least one component are/is set in such a manner, especially by means of an iterative simulation, especially a finite elements simulation, that a predeterminable condition is fulfilled.

74. The method as claimed in claim 72, wherein: stiffness of the at least one component is kept constant, while at least one frequency corresponding to one of the oscillation modes of the at least one component is set to a predeterminable value.

75. The method as claimed in claim 72, wherein: at least one frequency corresponding to one of the oscillation modes of the at least one component is kept constant, while at least the stiffness is set to a predeterminable value.

76. The method as claimed in claim 72, wherein: mass distribution, stiffness and/or geometry of the at least one component is selected in such a manner that at least one frequency corresponding to one of the oscillation modes of the housing module and at least one frequency corresponding to one of the oscillation modes of the sensor module are different from one another.

77. The method as claimed in claim 72, wherein: the at least one component is the at least one measuring tube flowed through by the fluid; and geometry, stiffness and/or mass distribution of the at least one measuring tube is selected in such a manner that the flow profile is conditioned and at least one disturbance effect evoked by the flow of the medium is minimized.

78. The method as claimed in claim 72, wherein: the primary forming process for manufacturing the at least one component is selective laser sintering, selective laser melting, laser deposition welding, a metal powder application method, fused deposition modeling, multi-jet modeling, color jet printing, or LaserCUSING.

79. The method as claimed in claim 72, wherein: the digital data set, which gives at least the shape and/or the material and/or the structure of the at least one component, is transmitted to a customer; and the at least one component is manufactured on-site at the customer's location by means of a primary forming process.

80. The method as claimed in claim 72, wherein: the least one component is manufactured by means of a layered applying and/or melting-on of a powder.

81. The method as claimed in claim 80, wherein: the powder is a metal powder.

82. The use of a measuring transducer of the vibration-type as claimed in claim 72: in a measuring device for registering and/or monitoring at least one process variable of a flowable medium guided in a pipeline.

Description

[0087] The invention will now be described in greater detail based on the appended drawing, FIGS. 1 to 9 of which show as follows:

[0088] FIG. 1 a field device of the state of the art of the field of the invention with two measuring tubes and a housing module with a support and a casing (a) in a sectional illustration, (b) in a perspective and exploded view and (c) in a sectional illustration without housing module;

[0089] FIG. 2 a first embodiment of the invention with two measuring tubes,

[0090] FIG. 3 a measuring tube of the invention (a) with variable wall thickness and cross sectional area and (b) with different options for the cross sectional shape,

[0091] FIG. 4 a second embodiment of a measuring tube of the invention with vibration damping hollow ducts, a flow forming module and two stiffness influencing fins, in (a) perspective view and (b) in a sectional illustration,

[0092] FIG. 5 a distributor piece of the invention with a number of branches,

[0093] FIG. 6 a curved measuring tube of the invention with a bypass line,

[0094] FIG. 7 a measuring transducer manufactured of one piece with vibration absorbing tube,

[0095] FIG. 8 a measuring tube of the invention with mass elements, and

[0096] FIG. 9 an anisotropic housing of the invention with a feedthrough for the electronics unit and an additional sensor.

[0097] FIG. 1 shows, by way of example, a field device 1 of the field of the invention according to the state of the art with two measuring tubes 9a,9b and a housing module 3 with support 4 and casing 5. In such case, FIG. 1a is an external view, while FIGS. 1b and 1c show interior views of the same field device 1.

[0098] FIG. 1 a shows an inlet end process connection 2a and an outlet end process connection 2b, by means of which the field device 1 can be integrated into an existing pipeline (not shown). Furthermore, the housing module 3 is visible, which in the embodiment shown here is composed of a support 4 in the form of a laterally at least partially open support cylinder, especially a tubular support cylinder, which is connected with the two measuring tubes (9a,9b; compare FIG. 1b), and a casing 5 surrounding at least the two measuring tubes 9a,9b and secured to the support 4. Mounted on the support 4 is, furthermore, a neck tube 6, via which an electronics unit 6a can be connected, which serves, for example, for signal registration, evaluation, and feeding.

[0099] The internal construction and especially the sensor module 7 of the field device 1 is better visible in the perspective representation in FIG. 1b. Integrated in the region of the inlet end process connection 2a and outlet end process connection 2b are an inlet end distributor piece 8a and an outlet end distributor piece 8b (not visible, see FIG. 1c), which distributor pieces 8a,8b are mechanically connected with the support 5 (not visible in this view). The stability of these connections is of great importance for the accuracy of measurement of the field device 1. The distributor pieces 8a,8b are likewise connected with the two measuring tubes 9a,9b and distribute and return the flowing medium respectively from and to the pipeline (not shown).

[0100] The two measuring tubes 9a, 9b, which at inlet end and outlet end extend out from the support 5, are mechanically coupled with one another by means of a number of coupling elements 10 (the lead line points to only one coupling element; there are, however, along the measuring tube a number of equivalent elements, which for reasons of perspicuity have not been provided with additional lead lines).

[0101] Other details of the construction are, finally, to be understood from the sectional illustration in FIG. 1c. Each of the two measuring tubes 9a,9b executes, during operation, oscillations, whose one possible movement track is indicated in the figure. Furthermore, at least one electromechanical, especially electro-dynamic, exciter mechanism 11 is shown acting on at least one measuring tube 9a,9b for producing and/or maintaining mechanical oscillations of the at least one measuring tube 9a,9b, as well as at least one vibration sensor arrangement 12 reacting to oscillations of the at least one measuring tube 9a,9b for producing at least one oscillatory measurement signal representing oscillations of the at least one measuring tube.

[0102] FIG. 2 shows a first embodiment of a measuring transducer 13 of the invention. For purposes of simplification, the exciter mechanism 11 as well as vibration sensor arrangement 12 are not shown. Measuring transducer 13 includes two measuring tubes 9a′,9b′, which together with a support 4′, two process connections 2a′, 2b′ and two distributor pieces 15a′, 15b′ are manufactured as one piece. Additionally visible for securement of an exciter mechanism 11 and vibration sensor arrangement 12 are six, pairwise arranged, connecting pieces, which likewise are manufactured with the above mentioned components as one piece. The walls of the two measuring tubes 9a′,9b′ have a profile, here a groove profile 16.

[0103] FIG. 3 shows other embodiments of the invention for a measuring tube 9a″, which, by way of example, is a straight tube. As evident from FIG. 3a, the wall thickness 17a, 17b of the measuring tube 9a″, i.e. the thickness of the wall 16, can vary along the length of the measuring tube 9a″. In this example, in a first subsection, the wall thickness 17a is less than the wall thickness 17b in a second subsection. Correspondingly, the cross sectional area 18a of the measuring tube 9a″ is greater in the first subsection than the cross sectional area 18b in the second subsection. Cross sectional area is, in such case, the area, which is surrounded by the wall 16 and whose normal vector points in the direction of the longitudinal axis of the measuring tube 9a″. The longitudinal axis extends parallel to the flow direction of the respective medium.

[0104] Besides a variable wall thickness 17a,17b′, and a variable cross sectional area 18a,18b, also the cross sectional shape 19a-d″ can be varied, meaning in the following that the geometry of the cross sectional area 18a,18b can be varied. While the cross sectional shape 19a for measuring tube 9a″ in FIG. 3a is round in both subsections, are other possible cross-sectional shapes 19b-d are shown in FIG. 3b, in each case without drawing the complete measuring tube 9a″. Examples include an oval 19b, a star-shaped 19d, and a circular segment shaped 19c cross sectional shape. The choice of a circular segment shaped, cross sectional shape 19c is, among other things, advantageous with reference to the space saving associated therewith in the case of application of more than one measuring tube 9a″,9b″, which results from the opportunity to position the at least two measuring tubes 9a″, 9b″ next to one another in such a manner that the straight regions of the peripheries adjoin one another.

[0105] Such geometric embodiments of a measuring tube 9a″,9b″ are not or only very difficultly implementable with conventional methods.

[0106] A third example of an embodiment for a measuring tube 9a′″ is the subject matter of FIG. 4, wherein FIG. 4a is a perspective view and FIG. 4b is a sectional illustration. Arranged externally on the measuring tube 9a′″ are two fins 21a, 21b, which extend externally from its wall 16′ on oppositely lying sides and provide a direction dependent stiffness of the measuring tube 9a′″. Further visible within the wall of the measuring tube 9a′″ with the wall thickness 17a′ are structures 20. These structures can be, for example, either hollow ducts extending essentially parallel to the internal volume of the measuring tube 9a′″ or individual, closed capsules, in given cases, filled with a powder.

[0107] Arranged in the inner space of the measuring tube 9a′″ is a flow forming module, or structure 22. In the case of a flow forming module, it can be, for example, a partition or a flow rectifier. Also a number of such modules can be integrated in the same measuring tube 9a′″, especially the internal volume of the measuring tube 9a′″ can be subdivided into as many fine, individual tubes as desired, similarly as in the case of multi-wire electrical cables.

[0108] The wall 17a′ of the measuring tube 9a′″, the two fins 21a,21b, and the flow forming module 22 are manufactured together as one piece. In the same manufacturing step, furthermore, likewise the structures 20 were formed in the wall 17a′ of the measuring tube 9a′″.

[0109] FIG. 5 shows a possible embodiment for a distributor piece 8a″ of the invention, which distributes the flow volume of the medium from the pipeline, which opens into the inlet 23 of the distributor piece 8a″, to 6 individual tubes 24a-f. The distributor piece 8a″ includes a multiply branched, continuous internal volume 23. The individual branches 23a-e divide the respective preceding section, in each case, into two subsections. The example shown here has five asymmetric branches 23a-e. Of course, also distributor pieces 8a″ with symmetric or partially symmetric branches, or with branches with one to three or more sections, and still many other examples are possible.

[0110] A fourth example of an embodiment for a measuring transducer 13′ with two curved measuring tubes 9a″″,9b″″ is shown in FIG. 6. The walls 16a″, 16b″ of the two measuring tubes 9a″″, 9b″″, the two process connections 2a″ and 2b″, the two distributor pieces (not visible in this Fig.) as well as the wall 16c″ of a straight bypass line 24 are manufactured together as one piece. A determinable portion of the flowing medium can be diverted through bypass line 24. Then a further sensor element 32 (compare FIG. 9) can be integrated within the bypass line 24, for example, for registering an additional process variable.

[0111] In the case, in which the particular field device has only one measuring tube 9a.sup.V, a vibration absorbing tube 25 is provided supplementally to the single measuring tube 9a.sup.V, such as shown, for example, in FIG. 7. In the example shown here, the vibration absorbing tube 25 has a greater diameter, thus a greater surface area of the cross sectional area 18b″, than the measuring tube 9a.sup.V. The measuring tube 9a.sup.V is integrated contactlessly in the interior of the vibration absorbing tube 25, and is coaxially surrounded by the vibration absorbing tube. The measuring tube 9a.sup.V, the vibration absorbing tube 25, as well as the two process connections 2a′″,2b′″ (only one shown) are manufactured together and as one-piece by means of the generative method.

[0112] Another opportunity for targeted influencing of the properties of a measuring tube 9a.sup.VI is shown in FIG. 8. Advantageously, the mass, respectively the mass distribution, of the measuring tube 9a.sup.VI can be changed in the shown manner, without thereby influencing the stiffness of the measuring tube. In this way, the position of the respective oscillation modes within the frequency spectrum of the measuring tube 9a.sup.VI can be varied.

[0113] Arranged on the external region of the wall 16′″ of the measuring tube 9a.sup.VI are, by way of example, two mass elements 26a,26b. The first mass element 26a is sectioned in the selected representation, in order to make the securement unit 27a,27b applied in each case visible, by means of which securement unit 27a,27b the mass element 26a is secured externally on the wall 16′″ of the measuring tube 9a.sup.VI. In the example shown here, the securement unit 27a,27b is a ring radially surrounding the measuring tube 9a.sup.VI. However, also struts extending parallel or perpendicular to the flow direction of the medium or fins extending along the wall of the at least one measuring tube 9a.sup.VI parallel to the flow direction or still other geometries can be used. In order that the stiffness of the measuring tube 9a.sup.VI remains essentially constant, the contact area 28a between the securement unit 27a and the mass element 26a and/or the contact area 28b between the securement unit 27a and the external region of the wall 16′″ of the measuring tube 9a.sup.VI should be kept minimal. Both the measuring tube 9a.sup.VI, as well as also the mass elements 26a,26b and the securement units 27a,27b are manufactured together as one-piece by means of the generative method.

[0114] Also different advantageous options are available for the transducer housing 3′, such as shown in FIG. 9, by way of example. Provided within the wall 16″″ of the transducer housing 3′ are, as in the case of the measuring tube 9a′″ of FIG. 4, structures 20′. They can be, for example, hollow ducts or empty/filled capsules. The wall 16″″ of the transducer housing 3a′ of FIG. 9 has, for example, an anisotropic structure. In a first portion 29a within the wall 16″″ a beehive structure 30 is present, while in a second portion 29b a composite material 31 is provided. Using such a construction, an anisotropic stiffness—and, in given cases, also an anisotropic mass distribution can be achieved, in such a manner that regions, which are exposed to an increased external force have, for example, a greater stiffness. Such regions are, for example, especially regions, in which the process connections (2a,2b) and/or distributor pieces (8a,8b) (not shown) are integrated. Besides different portions 29a,29b with different structures 20′, it is likewise an option for an anisotropic embodiment of a transducer housing 3′ to vary the density of the used materials, or the wall thickness 17a″″ (not shown) of the transducer housing 3′ in certain regions.

[0115] The housing includes supplementally a neck tube 6′, by means of which an electronics unit 6a (not shown) can be mounted on the transducer housing 3′. This neck tube 6′ is an optional component of the transducer housing 3′. Optionally integrated, furthermore, into the wall 16″″ of the transducer housing 3′ can be a supplemental sensor element 32, which can be utilized for registering an additional process variable, especially temperature or pressure. A corresponding sensor element 32 can, however, also be integrated in other components of a measuring transducer 15, for example, in a bypass line 24, such as shown in FIG. 6. Hollow spaces within the transducer housing 3′ can, finally, optionally be provided with a filling 33, especially a filling with damping properties. The filling can have, for example, a beehive structure or a porous structure. The wall 16″″ of the transducer housing 3′, the neck tube 6′ and the additional sensor element 32 are manufactured together as one piece by means of the generative method.

LIST OF REFERENCE CHARACTERS

[0116] 1 field device of the field of the invention with 2 measuring tubes [0117] 2a,2b inlet end, outlet end process connection [0118] 3 transducer housing [0119] 4 support [0120] 5 casing [0121] 6 neck tube [0122] 6a electronics unit with housing [0123] 7 sensor module [0124] 8a,8b inlet end, outlet end distributor piece [0125] 9a,9b first, second measuring tube [0126] 10 coupling elements [0127] 11 exciter mechanism [0128] 12 vibration sensor arrangement [0129] 13 measuring transducer [0130] 14a-c connecting piece pairs [0131] 15 groove profile [0132] 16a,16b wall of a component, e.g. wall of the measuring tube or transducer housing [0133] 17a,17b wall thickness of the measuring tube [0134] 18a,18b surface area of the cross sectional area of the measuring tube (or vibration absorbing tube) [0135] 19a-d cross sectional shape of the cross sectional area of the measuring tube [0136] 20 structures within the wall of the measuring tube, especially hollow ducts, or empty/filled capsules [0137] 21a,21b fins formed externally on the measuring tube [0138] 22 flow forming module or structure [0139] 23 inlet into the distributor piece, internal volume of the distributor piece [0140] 23a-e branches within the distributor piece [0141] 24 bypass line [0142] 25 vibration absorbing tube [0143] 26a,26b mass element [0144] 27 securement unit for securing a mass element [0145] 28a,28b contact areas between mass elements/measuring tube and mass element/securement unit [0146] 29a,29b portions of the wall of the transducer housing [0147] 30 beehive structure [0148] 31 composite material [0149] 32 supplemental sensor element [0150] 33 filling