摘要:
Disclosed is a measurement transducer comprising a measurement tube (M), which has an inlet-side tube end (M+), an outlet-side tube end (M#), a tube wall with a pre-defined wall thickness, and a lumen, which extends between the first and second tube ends of the measurement tube and which is enclosed by said tube wall, further comprising a support element (TE), which is mechanically connected at one support end (TE+) to the tube end (M+) and at one support end (TE#) to the tube end (M#), and a support element (TS), which is laterally spaced from the measurement tube and which is mechanically coupled at one support end (TS+) to the support end (TE+) and at one support end (TS#) to the support end (TE#). The measurement tube of the measurement transducer is provided to guide a flowing medium in its lumen and to simultaneously be allowed to vibrate about a static rest position in order to generate Coriolis forces. The measurement transducer also comprises a vibration exciter (E) and at least one vibration sensor (S1; S2). The measurement transducer possesses a use mode, which has a resonance frequency and in which the measurement tube (M) can execute use vibrations around its static rest position at a use frequency that corresponds to the resonance frequency of the use mode, which use vibrations are suitable for generating Coriolis forces. The vibration exciter (E), of which one exciter component (E1') is arranged externally on the measurement tube (M) and one exciter component (E1") is arranged on the support element (TE), is also provided to induce said use vibrations in the measurement tube, and the vibration sensor, of which one sensor component (SV) is arranged externally on the measurement tube (M) and one sensor component (SV) is arranged on the support element (TS), is provided to detect movements of the measurement tube (M) relative to the support element (TS) and to transduce said movements into a vibration signal that represents vibrations of the measurement tube.
摘要:
The invention relates to a method for detecting a deposit formation or an abrasion on a first measuring tube (A) of a flow meter (2) through which a medium flows. A first temperature time curve is detected by means of a first temperature sensor (30), which is arranged on the first measuring tube (A) in such a way that at least one measuring tube wall of the first measuring tube (A) is formed between the first temperature sensor (30) and the medium. At the same time, a second reference temperature time curve is detected by a second temperature sensor (38) that is at a distance from the first temperature sensor (30), which second temperature sensor is thermally coupled to the medium. From this, at least one variable that is characteristic for a heat exchange from the medium via the measuring tube wall to the first temperature sensor (30) is determined and a deposit formation or an abrasion on the first measuring tube (A) is detected, if the at least one measured characteristic variable or a variable derived therefrom differs by more than one threshold value from a pre-determined reference variable.
摘要:
The invention relates to a measurement transducer used to generate vibration signals which correspond to parameters of a flowing medium, such as a mass flow rate, density and/or viscosity, said measurement transducer comprising a measurement transducer housing that has a housing end (100+) and a housing end (100#), as well as a pipe arrangement which is formed by at least two pipes (11, 12) and extends inside the measurement transducer housing from its housing end (100+) to its housing end (100#). Of the two pipes, at least pipe (11) is designed as a measurement pipe for conducting a flowing medium, and pipe (12) is mechanically connected to pipe (11) by means of a coupler element (25), with an inlet-side coupling zone (11+, 12+) thus being formed, and by means of a coupler element (26), with an outlet-side coupling zone (11#, 12#) thus being formed. Coupler element (25) is positioned the same distance away from housing end (100+) as coupler element (26) is from housing end (100#). In addition, coupler element (25) has a flexural rigidity about an imaginary longitudinal axis (K) of the pipe arrangement, which axis imaginarily connects a centre of mass (M 25 ) of coupler element (25) and a centre of mass (M 26 ) of coupler element (26) and, in particular, imaginarily intersects both coupler element (25) and coupler element (26) at the same angle of intersection, said flexural rigidity of coupler element (25) deviating from a flexural rigidity of coupler element (26) about the specific imaginary longitudinal axis (K) of the pipe arrangement.
摘要:
The invention relates to a measuring sensor comprising a sensor housing (7 1 ), of which a housing end on the inlet side is formed by means of an inlet-side flow divider (20 1 ) having exactly four respectively mutually spaced flow openings (20 1A , 20 1B , 20 1C , 20 1D ), and a housing end on the outlet side is formed by means of an outlet-side flow divider (20 2 ) having exactly four respectively mutually spaced flow openings (20 2A , 20 2B , 20 2C , 20 2D ), and a pipe arrangement having exactly four curved measuring pipes (18 1 , 18 2 , 18 3 , 18 4 ) connected to the flow dividers (20 1 , 20 2 ), forming flow paths fluidically connected in parallel, for carrying flowing medium, and each of the four measuring pipes in each case opening with an inlet-side measuring pipe end in respectively one of the flow openings of the flow divider (20 1 ) and with an outlet-side measuring pipe end in respectively one of the flow openings of the flow divider (20 2 ). In the measuring sensor according to the invention, the two flow dividers (20 1 , 20 2 ) are additionally formed and disposed in the measuring sensor in such a way that the pipe assembly has an imaginary longitudinal sectional plane (YZ) running both between a first and a second of the measuring pipes and between a third and a fourth of the measuring pipes and with respect to which the pipe assembly is mirror-symmetrical, and an imaginary longitudinal sectional plane (XZ) located both between the first and the third of the measuring pipes and between the second and the fourth of the measuring pipes and perpendicular to the imaginary longitudinal sectional plane (YZ) and with respect to which the pipe arrangement is likewise mirror-symmetrical. An electro-mechanical exciter assembly (5) of the measuring sensor is used to generate and/or maintain mechanical vibrations of the four measuring pipes (18 1 , 18 2 , 18 3 , 18 4 ).
摘要:
The invention relates to a sensor for detecting at least one physical measurable variable of a flowable medium guided in a tube conduit and/or for producing Coriolis forces which serve to detect the mass flow rate of a flowable medium guided in a tube conduit. The sensor comprises a sensor housing (7 1 ), a housing end on the inlet side being defined by a splitter (20 1 ) on the inlet side which has exactly four respective interspaced flow openings (20 1A , 20 1B , 20 1C , 20 1D ) and a housing end on the outlet side being defined by a splitter (20 2 ) on the outlet side which has exactly four respective interspaced flow openings (20 2A , 20 2B , 20 2C , 20 2D ), and exactly four straight measuring tubes (18 1 , 18 2 , 18 3 , 18 4 ) for guiding the flowing medium which tubes are connected to the splitters (20 1 , 20 2 ) to give fluidically parallel flow paths. The respective measuring tube end on the inlet side of each of the four measuring tubes leads to one of the flow openings (20 1A , 20 1B , 20 1C , 20 1D ) of the splitter (20 1 ) on the inlet side and the respective measuring tube end on the outlet side leads to one of the flow openings (20 2A , 20 2B , 20 2C , 20 2D ) of the splitter (20 2 ) on the outlet side. The sensor further comprises an electro-mechanical exciter arrangement (5) for producing and/or maintaining mechanical vibrations of the four measuring tubes (18 1 , 18 2 , 18 3 , 18 4 ), the exciter arrangement being designed such that it can be used to excite the paired measuring tubes to perform respective counter-phase flexural vibrations in a respective common imaginary plane of vibration (XZ 1 , XZ 2 ). The sensor according to the invention is especially suitable for measuring a density and/or a mass flow rate of a medium which flows at least temporarily inside a tube conduit at a mass flow rate of more than 2200 t/h.
摘要:
The invention relates to a in-line measuring device, designed in particular as a Coriolis mass-flow/density measuring device and Coriolis mass-flow/viscosity measuring device, comprising a probe (10) of the vibrating type with at least one vibrating tube (110) which vibrates when in operation for the at least temporary guidance of a two or multi phase free-flowing medium, with an energiser arrangement (116) acting on the measuring tube to generate vibrations in the at least one measuring tube (110) and a sensor arrangement (117, 118) for recording vibrations of the at least one measuring tube, giving a vibration measured signal (S 1 , S 2 ) representing the vibrations of the measuring tube. The in-line measuring device further comprises a measuring device electronic circuit (20) electrically coupled to the probe, which at least temporarily provides an energiser signal (i exc ) driving the energiser arrangement, such that at least one measuring tube is energised in operation by the energiser arrangement controlled by the at least one energiser signal to at least temporarily give vibrations in a use mode for the probe, in which at least components of flexural vibrations about an imaginary flexural axis of the probe occur, essentially parallel to an imaginary longitudinal axis of the measuring tube joining the inlet end of the measuring tube to the outlet end of the measuring tube or is coincident therewith and the at least one measuring tube vibrating in use mode, vibrates under the influence of Coriolis forces induced in the flowing medium in at least temporarily in a Coriolis mode overlaid on the use mode in which at least components of flexural vibrations occur anti-symmetrically with relation to an imaginary mid-plane coplanar to a cross-section of the measuring tube, about the imaginary flexural vibrational axis of the probe. Furthermore, the measuring device electronic circuit at least temporarily determines a first type of damping value (X DI ), representing an instantaneous damping of vibrations of the at least one measuring tube counteracting the flexural vibrations corresponding to the Coriolis mode.