CN1894561A - Coriolis mass flowmeter - Google Patents
Coriolis mass flowmeter Download PDFInfo
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- CN1894561A CN1894561A CNA200480036981XA CN200480036981A CN1894561A CN 1894561 A CN1894561 A CN 1894561A CN A200480036981X A CNA200480036981X A CN A200480036981XA CN 200480036981 A CN200480036981 A CN 200480036981A CN 1894561 A CN1894561 A CN 1894561A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
- G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8422—Coriolis or gyroscopic mass flowmeters constructional details exciters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Measuring Volume Flow (AREA)
Abstract
Disclosed is a Coriolis mass flowmeter/density meter comprising at least one measuring tube (11) through which a two-phase or multiphase medium flows during operation thereof. A supporting means (12) of the Coriolis mass flowmeter/density meter is fixed to an inlet end and an outlet end of the measuring tube (11), thus clamping the same so as to allow the measuring tube (11) to vibrate. The measuring tube (11) is made to vibrate mechanically, particularly to perform bending vibrations, by means of an excitation system (13). The inventive Coriolis mass flowmeter/density meter further comprises means (141, 142) for generating test signals (xs1, xs2 ) representing vibrations at the inlet end and outlet end of the measuring tube (11). An electronic evaluation unit (2) generates an intermediate value (X'm) that is derived from the test signals (xs1, xs2) and represents a tentatively determined mass flow rate as well as a second intermediate value (X2) derived from the test signals (xs1, xs2), especially from a measured value (Xrho) which is also generated in the electronic evaluation unit (2) and represents a density of the medium, said second intermediate value (X2) representing a measure of a concentration of a phase in the medium. A corrected value (XK) for the first intermediate value (X'm) is determined using the second intermediate value (X2), said corrected value (XK ) being selected among a plurality of predefined values stored in a table memory (56) by means of the intermediate value (X2). The electronic evaluation unit (2) additionally generates a measured value (Xm) representing a mass flow rate with the aid of the intermediate value (X'm) and the corrected value (XK).
Description
The present invention relates to a kind of coriolis mass flowmeters/densitometer, it is used for particularly two-phase or multiphase medium that pipeline flows, and the invention still further relates to a kind of method that is used to produce the measured value of representation quality flow.
In process measurement and automatic technology, physical parameter for fluid mobile in the measuring channel, mass rate for example, density and/or viscosity, often use this measurement instrument, it utilize to insert in the pipeline of guiding fluid and the vibration-type measuring transducer of being flowed through by fluid in operation and coupled measurement and function circuit influence reacting force in the fluid, for example corresponding to the Coriolis force of mass rate, corresponding to the inertial force of density or corresponding to friction force of viscosity etc., measurement instrument obtains representing the current mass rate of fluid from these power, one or more measuring-signals of current viscosity and/or current density.Such vibration-type measuring transducer for example has illustrated in following document: WO-A 03/076880, WO-A 02/37063, WO-A01/33174, WO-A 00/57141, WO-A 99/39164, WO-A 98/07009, WO-A95/16897, WO-A 88/03261, US 2003/0208325, US-B 65 13 393, US-B65 05 519, US-A 60 06 609, US-A 58 69 770, US-A 57 96 011, US-A 5,602 346, US-A 53 01 557, US-A 52 59 250, US-A 52 18 873, US-A 50 69074, US-A 50 29 482, US-A 48 76 898, US-A 47 33 569, US-A 46 60 421, US-A 45 24 610, US-A 44 91 025, US-A 41 87 721, EP-A 553 939, EP-A1 001 254 or EP-A 1 281 938.
In order to guide fluid, measuring transducer comprises at least one measuring tube, and it for example is contained in tubulose or the box-like supporting frame.Measuring tube has bending or straight pipeline section, makes this pipeline section vibration by the motor exciting bank during operation, to produce above-mentioned reacting force.In order to detect the particularly pipeline section vibration of inlet end and endpiece, measuring transducer also has the electric physical sensors setting that the motion of pipeline section is reacted to some extent.In the situation of the coriolis mass flowmeters that is used for the mobile medium of pipeline, the measurement of mass rate is achieved in that and for example allows MEDIA FLOW through inserting ducted measuring tube and in operation vibration survey pipe, thereby makes medium be subjected to Coriolis force.This makes the inlet end of measuring tube and endpiece zone vibrate on phase shift ground each other.Phase shift size measuring as mass rate.Therefore, the vibration of measuring tube is utilized the length along measuring tube of sensor as aforementioned setting two osciducers separated from one another and detects and be converted into the oscillation measurement signal, draws mass rate by the phase shift between them.
Above-mentioned US-A 41 87 721 has mentioned, and the instantaneous density of flow media also can utilize Coriolis mass flowmeter to measure usually, and in fact based on the frequency of at least one oscillation measurement signal that transmission is set by sensor.In addition, the temperature of medium is also directly measured with suitable manner usually, for example utilizes the temperature sensor that is arranged on the measuring tube.So can suppose, in any situation, utilize density and temperature that modern Coriolis mass flowmeter can also measuring media, consider particularly that these are measured and can be used to usually compensate because the measuring error that the fluid density that fluctuates causes; About this point, especially referring to WO-A 02/37063, WO-A 99/39164, US-A 56 02 346 or WO-A 00/36379.
Yet, have been found that in the use of oscillation mode measuring transducer, in the situation of nonhomogeneous media, particularly in the situation of two-phase or multiphase stream, the oscillation measurement signal that obtains from the vibration of measuring tube particularly also has described phase shift all to be subjected to considerable fluctuation, although separately the viscosity of fluid phase and density and mass rate are actually constant and/or obtained suitable consideration, thereby if there is not remedial measures then these signals will can not be used to measure the physical parameter of expectation fully.This nonhomogeneous media can be a liquid for example, and the gas that exists in the pipeline in the situation of feed or filling process particularly air is introduced into wherein inevitably, perhaps Rong Xie fluid for example carbon dioxide from this liquid, discharge and bubble.Moist or saturated steam is another example of this nonhomogeneous media.
In US-A 45 24 610, for the operation of vibration-type measuring transducer, provided a kind of possible reason of this problem, promptly, heterogeneity is entered measuring tube such as bubble by fluid carry-over, is deposited on its inwall and thereby can influences oscillating characteristic to a certain extent.For fear of this problem, also propose to install and measure transmitter like this, make straight measuring tube extend substantially vertically, with heteropical precipitation of the particularly gaseous state that prevents this interference.Yet this is a very special solution, and it can only realize in the condition of limited very much, particularly in the measuring technique in industrial process.On the one hand, in this situation, measuring transducer to be fit into wherein pipeline may must be fixed to transmitter rather than conversely, this will be that the user does not expect.On the other hand, as already mentioned, measuring tube may be crooked, thereby can not deal with problems by changing the orientation of installing.In addition, clearly, by the deterioration of the measuring-signal that uses vertically arranged straight measuring tube in fact not avoid significantly to be mentioned.In addition, it all is unsuccessful avoiding the further effort of the fluctuation of such measuring-signal that produces in the situation of streaming flow by this way.
Similarly for example discuss in JP-A 10-281846, WO-A 03/076880, US-A 52 59 250, US-A50 29 482 or US-B 65 05 519 to some extent for the influence of measuring accuracy reason and they in determining the situation of mass rate.Yet, in order to reduce the measuring error in two-phase or multiphase stream, WO-A 03/076880 has proposed to carry out fluid regulation before actual flow is measured, and JP-A 10-281846 and US-B 65 05 519 are preferably according to oscillation measurement signal correction flow measurement, particularly mass flow measurement.This proofread and correct for example use for the pre-training of oscillation measurement signal in addition may be adaptive sorter.Sorter can for example be designed to Kohonen mapping or neural network, and or based on the several parameters of measuring in the operation particularly mass rate and density and the further feature that obtains thus, perhaps also utilize the time interval of the oscillation measurement signal that comprises one or more oscillation period, proofread and correct and carry out.
Use this sorter to compare with existing coriolis mass flowmeters/densitometer, for example have measuring transducer almost be need not the advantage that changes, here, change the function circuit that relates to physical construction, exciting bank or drive it, they all mate application-specific especially.
Yet a remarkable shortcoming of this sorter is, compares with existing Coriolis mass flowmeter, needs sizable change in the zone that produces measured value, especially analog to digital converter of Shi Yonging and microprocessor.In fact, as disclosed in US-B 65 05 519, for example in the digitizing of the oscillation measurement signal of about 80Hz oscillation frequency, the sort signal analysis need about 55kHz or higher sampling rate, to reach enough precision.In other words, must use the sampling rate sampling oscillation measurement signal that is far longer than 600: 1.In addition, the firmware of storage and execution correspondingly becomes complicated in the digital measurement circuit.
Another shortcoming of this sorter is, for measuring transducer in esse measuring condition of operating period, must train and correspondingly confirm particularly for the installation site, treat characteristic or other factor that influences measuring accuracy that fluid measured and its change usually.Because the interactive high complexity of all of these factors taken together, training and affirmation thereof can only onlinely be carried out and carry out separately for each measuring transducer usually, and this causes that measuring transducer starts cost and raises.In addition, have been found that, but this sorting algorithm is on the one hand because the high complexity suitable physical mathematics model of relevant or comprehension parameter because common imprecise existence possesses skills on the other hand, so sorter has very low transparency and thereby often is difficult to be communicated with.Certainly, what be associated therewith is, in client's part considerable reservation can be arranged, and when the sorter that uses is adaptive, when for example being neural network, this acceptance problem occurs in client's part especially.
An object of the present invention is to provide a kind of corresponding coriolis mass flowmeters, it can measure mass rate, even at heterogeneous fluid particularly in the situation of polyphasic flow.Another purpose provides a kind of correlation method that is used to produce measurement result.
In order to reach these purposes, the present invention proposes a kind of coriolis mass flowmeters, particularly Coriolis-type mass flowmeter/densimeter, is used for the mass rate of mobile particularly two-phase or multiphase medium of measuring channel, and this coriolis mass flowmeters comprises:
-at least one inserts ducted measuring tube, and it is in operation by the MEDIA FLOW warp;
-supportive device, its be fixed to the inlet end of measuring tube and endpiece and thereby clamping measuring tube oscillatorily;
-exciting bank, it makes measuring tube carry out mechanical oscillation in operation, particularly crooked vibration;
-osciducer is used for producing:
-the first oscillation measurement signal, it represents the entrance side vibration of measuring tube, and
-the second oscillation measurement signal, it represents the outlet side vibration of measuring tube; With
-measure and operating electronic devices its transmission
--drive exciting bank exciting current and
--mass flow measurement, it represents mass rate to be measured,
-wherein measure and operating electronic devices
--produce first intermediate value that obtains from the oscillation measurement signal, and produce the corrected value that is used for first intermediate value corresponding to mass rate to be measured, and
--utilize first intermediate value and corrected value, determine mass flow measurement,
-wherein measure and operating electronic devices produces corrected value by using at least one second intermediate value,
--this second intermediate value obtains from least one oscillation measurement signal and/or from exciting current, and
--this second intermediate value is represented the medium ratio of part mutually,
-wherein measure and operating electronic devices
--have the table storer, a plurality of discrete preset values of stored digital wherein for corrected value, and
--in order to determine corrected value, use one of preset value, this preset value is based on second intermediate value and reads from the table storer.
In addition, the invention provides a kind of method, be used to utilize coriolis mass flowmeters, particularly Coriolis-type mass flowmeter/densimeter generates the measured value of the physical measurement variable of representing the medium that flows in the pipeline, the mass flow measurement of representation quality flow particularly, this method may further comprise the steps:
-in the coriolis mass flow meter measurement pipe that medium is flowed through, cause vibration, particularly crooked vibration;
-detect the vibration of measuring tube, and generate the first oscillation measurement signal of representing the entrance side vibration and the second oscillation measurement signal of representing the outlet side vibration;
-by using two oscillation measurement signals, obtain corresponding to physical measurement variable first intermediate value of mass rate particularly;
-particularly utilize at least one in two oscillation measurement signals, determine second intermediate value;
-utilize second intermediate value of representing medium phase part ratio, produce corrected value for first intermediate value; And
-utilize corrected value to proofread and correct first intermediate value;
-wherein determine corrected value like this by using second intermediate value and use table storer, promptly be used for the preset value of corrected value and read this preset value, wherein show a plurality of discrete preset values of stored digital in the storer for corrected value from the table storer based on the identification of second intermediate value is instantaneous.
According to first embodiment of coriolis mass flowmeters of the present invention, the analytical electron device sends mass flow measurement, and it is represented the mass rate of medium and obtains from the first and/or second oscillation measurement signal.
In second embodiment of coriolis mass flowmeters of the present invention,
-analytical electron device sends density measurement, and it is represented density of medium and obtains from the first and/or second oscillation measurement signal, and
-analytical electron device also utilizes density measurement to determine corrected value.
According to the 3rd embodiment of coriolis mass flowmeters of the present invention, the analytical electron device is based on the storage address of the preset value of storing in the definite table of second intermediate value storer that is used as the instantaneous correction value.
In the 4th embodiment of coriolis mass flowmeters of the present invention, second intermediate value is based at least the dispersion degree of oscillation frequency, density measurement and/or first intermediate value of amplitude, oscillation measurement signal of amplitude, the oscillation measurement signal of the exciting current of determining at interval for preset time and definite.
First embodiment of the method according to this invention, this method is further comprising the steps of:
-obtain representing second measured value of Media density according to measuring-signal; And
-use second measured value to obtain corrected value.
In second embodiment of method of the present invention, this method is further comprising the steps of:
-allow flow through motor exciting bank with the measuring tube mechanical couplings of exciting current, to cause the measuring tube vibration; With
-determine second intermediate value by considering exciting current.
In the 3rd embodiment of method of the present invention, second intermediate value is represented at least one dispersion degree, it is the measured value of determining for the medium that flows in the pipeline in specified time interval, the particularly mass rate of Ce Lianging, density measurement, measurement viscosity and definite dispersion degree, and/or at the fixed time at interval in the oscillation frequency of the running parameter, the particularly amplitude of oscillation measurement signal of coriolis mass flowmeters or oscillation measurement signal and definite dispersion degree.
An advantage of the invention is, be used to proofread and correct the temporary transient representation quality flow of corrected value of first intermediate value and definite with existing method basically, this corrected value on the one hand can be at first relatively simply but very accurately determine, on the other hand, this corrected value can very rapidly adapt to the condition that changes in the testing medium, the concentration ratio that particularly adapt to change because for it determine only need seldom calculating.So, coriolis mass flowmeters of the present invention is compared with existing coriolis mass flowmeters, only on numerical analysis electronic installation commonly used, slightly change and change and only limit to firmware basically, and in the situation of measuring transducer and in generation and pre-service oscillation measurement signal, need hardly to change.So, for example the oscillation measurement signal still can as in the past with use always far below 100: 1, particularly about 10: 1 sampling rate is sampled.
Further advantage of the present invention is, particularly compare with the Coriolis mass flowmeter of explanation among the US-B 65 05 519, because analytical approach of the present invention can adapt to instantaneous flox condition in very simple mode by repeating to select current optimal coefficient again from the table storer, so always can carrying out identical analytical approach in practice, the present invention determines measured value, even flox condition marked change in measuring tube, two-phase or multiphase for example temporary transient medium and/or the medium that temporarily is grouped into by multiple one-tenth even or each mutually and/or the concentration change of composition.
The embodiment that provides in inciting somebody to action with reference to the accompanying drawings now explains the present invention and further preferred embodiment thereof in detail.Identical parts have identical mark in institute's drawings attached; For clear, already mentioned Reference numeral is omitted in the accompanying drawing of back.
Fig. 1 has shown the Coriolis mass flowmeter that is used to generate mass flow measurement with side view perspective ground,
Fig. 2 schematically illustrates the measurement instrument preferred embodiment of the Coriolis mass flowmeter that is applicable to Fig. 1 with block diagram,
Fig. 3 has shown the partial cross section example of embodiment of the vibration-type measuring transducer of the Coriolis mass flowmeter that is applicable to Fig. 1 with first side view perspective ground,
Fig. 4 with second side view perspective ground shown Fig. 3 measuring transducer and
Fig. 5 has shown the embodiment of motor exciting bank of the measuring transducer of Fig. 3.
Fig. 1 has shown Coriolis mass flowmeter 1 with having an X-rayed, measurand (being mass rate here) the measured value X that it is used for detecting the physical measurement variable (being mass rate m) of two-phase or multiphase mobile medium of pipeline here and forms this measurand of instantaneous representative (being mass rate) here
mFor the sake of clarity, the pipeline that do not draw.In fact medium can be any flowable materials, for example liquid, gas or steam have wherein also been introduced heterogeneity except main or mounting medium, promptly, with the soluble part of compatibility other medium devious of mounting medium, for example solid particle in the liquid and/or bubble.In order to measure mass rate, Coriolis mass flowmeter 1 vibration-type measuring transducer 10 and the measurement instrument electronic installation 50 that is electrically connected with measuring transducer 10 shown in Figure 2.In order to settle measurement instrument electronic installation 50, electronic device housing 200 also is provided, it is installed in measuring transducer 10 outsides.
In order to detect mass rate m, by means of producing Coriolis force in the fluid that flows therein by the measuring transducer 10 of measurement instrument electronic installation 50 excited vibrations in operation, Coriolis force depends on mass rate m and can measure on measuring transducer 10, promptly can be by sensor and can be by electronic analysis.Except generating mass flow measurement X
m, Coriolis mass flowmeter also is used to measure the density p of flow media and the density measurement X that determines instantaneous representative density p
ρ
Preferably, measurement instrument electronic installation 50 is also designed like this, make it to measure and/or other service data via data transmission system and the exchange of higher level's measured value processing unit at Coriolis mass flowmeter 1 duration of work, described measured value processing unit for example is programmable logic controller (PLC) (PLC), PC and/or workstation, and described data transmission system for example is a field bus system.In addition, also like this design measurement instrument electronic installation 50 makes it to be powered by exterior source of energy, for example even via aforementioned field bus system.For the situation that provides the vibration survey instrument to be used to be coupled to fieldbus, particularly programmable measurement instrument electronic installation 50 has the corresponding communication interface and is used for data communication, for example is used for measurement data is sent to higher level's programmable logic controller (PLC) or higher level's Process Control System.
Fig. 3 and 4 has shown an embodiment as the oscillating mode physical electronic transducer setting of measuring transducer 10.The 26S Proteasome Structure and Function of this transducer is well known by persons skilled in the art and for example in US-A 60 06 609 detailed description is arranged.
Treat fluid measured in order to guide, measuring transducer 10 comprises that at least one has the measuring tube 13 of inlet end 11, endpiece 12, its have can be scheduled to during operation can elastic deformation measuring tube inner chamber 13A and have the Nominal Width that can be scheduled to.Here, the elastic deformation of measuring tube inner chamber 13A means, for the Coriolis force of the sign fluid that produces fluid inside, the spatial form of measuring tube inner chamber 13A and/or locus in the elastic range of measuring tube 13 with the mode that can be scheduled to periodic variation particularly circularly; For example referring to US-A 48 01 897, US-A 56 48 616, US-A 57 96 011 and/or US-A 60 06 609.In addition, here be also noted that, although the measuring transducer among the embodiment only comprises a straight measuring tube, but in order to realize the present invention, this vibration-type measuring transducer also can use the in fact illustrated any Coriolis mass and flow measuring transducer of prior art, particularly has fully or to this crooked oscillation mode transmitter of small part with the crooked or straight measuring tube of crooked mode of oscillation vibration.Particularly suitable for example is the vibration-type measuring transducer with two parallel bend measuring tubes of being flowed through by testing medium, such as what describe in detail in following document: EP-A 1 154 243, US-A 53 01 557, US-A 57 96 011, US-B 65 05 519 or WO-A 02/37063.This other suitable embodiment that is used as the transducer setting of measuring transducer 10 can for example obtain in following document: WO-A 02/099363, WO-A 02/086426, WO-A 95/16897, US-A 56 02 345, US-A 55 57 973 or US-A 53 57 811.As the material of employed measuring tube 13, for example titanium alloy is suitable especially.Yet, replace titanium alloy, can use the normally used material of other this particularly bend measuring tube, for example, stainless steel, tantalum or zirconium etc.
Measuring tube 13 communicates in its entrance side and outlet side and introducing or the pipeline of drawing fluid in common mode, this measuring tube by clamp oscillatorily in the supporting frame 14 of the particularly counter-bending of rigidity and distortion.Replace the box-like supporting frame 14 of demonstration here, can certainly use other suitable supportive device, such as parallel with measuring tube or axially extending pipeline.
Supporting frame 14 utilizes access panel 213 to utilize exit plate 223 to be fixed to measuring tube 13 at its outlet side at its entrance side, the corresponding extension of the tested buret 13 of these plates and penetrating.In addition, supporting frame 14 has first side plate 24 and 34, two side plates of second side plate 24,34 are fixed to access panel 213 and exit plate 223 respectively, make them be arranged essentially parallel to that measuring tube 13 extends and with its at a distance of being provided with, and each other apart; Referring to Fig. 3.By this way, the opposed facing side surface of two side plates 24,34 is parallel to each other equally.Vertically rod 25 is fixed to side plate 24,34, with measuring tube 13 apart, with balance mass as the vibration of absorptiometry pipe 13.As shown in Figure 4, but vertically the rod 25 whole oscillation length that are arranged essentially parallel to measuring tube 13 extend; Yet this is not essential, because vertically rod 25 also can be done shortlyer as required.So, have two side plates 24,34, access panel 213, exit plate 223 and vertically the supporting frame 14 of rod 25 have and be arranged essentially parallel to the virtual vertical gravity vertical that is connected the measuring tube central axis 13B of inlet end 11 and endpiece 12.
Among Fig. 3 and 4 with screw head indication, above-mentioned side plate 24,34 is fixed to access panel 213, exit plate 223 and vertically rod 25 can connect by spinning and realize; Yet, also can use other suitable fastening type known in the art.
For measuring transducer 10 will by releasably with the situation of pipeline assembling, form first flange 19 and form second flange 20 at the entrance side of measuring tube 13, as shown in Figure 1 at outlet side; Yet, replace flange 19,20, can form other conduit coupling and be used for releasably linking to each other with pipeline, all so-called as shown in Figure 3 three-dimensional clips (triclamp) connect.Yet if desired, measuring tube 13 can also for example utilize welding or brazing etc. directly to link to each other with pipeline.
In order to produce described Coriolis force, at measuring transducer 10 duration of works, by the motor exciting bank 16 that is coupled to measuring tube with the oscillation frequency that can be scheduled to particularly natural resonance frequency drive measuring tube 13 with so-called useful mode vibration, and measuring tube 13 is by the mode elastic deformation being scheduled to then, and wherein natural resonance frequency also depends on the density of fluid.In described embodiment, as common in the situation about being provided with at crooked oscillation mode transducer, the measuring tube 13 of vibration spatially particularly laterally is offset static rest position.Basically also is same for wherein one or more bend measuring tubes around the transducer setting that respective virtual connects the longitudinal axis execution oscillating cantilevered beam of inlet and endpiece; Perhaps the bending vibration in single plane of oscillation of transducer setting only carry out to(for) wherein one or more straight measuring tubes also is same.
The electric excitation power P that provides from measurement instrument electronic installation 50 by conversion is provided exciting bank 16
Exc, and produce the exciting force F that acts on the measuring tube 13
ExcExciting power P
ExcBasically only be used for compensating because machinery and fluid internal friction and the power section of removing from oscillatory system.In order to obtain high as far as possible efficient, as far as possible accurately regulate exciting power P
Exc, make the vibration of measuring tube 13 be maintained at useful pattern basically, for example be fundamental resonance frequency.
For with exciting force F
ExcBe delivered on the measuring tube 13, as shown in Figure 5, exciting bank 16 has the electromagnetism of rigidity and/or the lever of motorized motions is provided with 15, and it comprises cantilever 154 and yoke 163, and wherein cantilever is fixed on the measuring tube 13 counter-bendingly.Yoke 163 is fixed on cantilever 154 and measuring tube 13 end apart equally counter-bendingly, and makes it be arranged on measuring tube 13 tops and horizontal with it.Cantilever 154 can for example be a metal washer, and it is contained in measuring tube 13 in the hole.For lever other suitable embodiment of 15 is set, already mentioned US-A60 06 609 all is incorporated in here as a reference.Lever be provided with 15 be T shape and be provided with like this, referring to Fig. 5, make its basic half point between entrance and exit end 11,12 act on measuring tube 13, have its maximum transversal skew during operation at the middle part thereby manage 13.
For activation lever is provided with 15, as shown in Figure 5, exciting bank 16 comprises: first drive coil 26 and the first permanent magnetism armature 27 related with it, and second drive coil 36 and the second permanent magnetism armature 37 related with it.Two drive coils that are electrically connected in series 26,36 particularly releasably are being fixed on the supporting frame 14 on the both sides of the measuring tube under the yoke 163 13 with having advantage, make them interact with their armatures 27 and 37 separately during operation.If desired, two drive coils 26,36 can certainly be connected in parallel with each other.Shown in Fig. 3 and 5, two armatures 27,37 are fixed to yoke 163 by this way each other apart, make at measuring transducer 10 duration of works armature 27 basic magnetic field penetration and this armature 37 basic magnetic field penetrations by drive coil 36 by drive coil 26.So armature is owing to electronic and/or electromagnetic force effect is accordingly moved.Moving of the armature 27,37 that utilizes the magnetic field of drive coil 26,36 and produce is delivered on the measuring tube 13 by yoke 163 and cantilever 154.These motions of structure armature 27,37 like this make yoke 163 alternately be offset from its rest position on the direction of side plate 24 or on the direction of side plate 34.Lever is provided with the 15 corresponding turning axles parallel with described measuring tube central axis 13B can for example pass through cantilever 154.
In addition, supporting frame 14 comprises the support 29 of motor exciting bank 16, and it particularly releasably links to each other with side plate 24,34, especially for supporting drive coil 26,36 and possible electromagnetic brake discussed below that each parts of 217 are set.
At last, measuring transducer 1 has the measuring transducer shell 100 around measuring tube and supporting frame, with the external action of protecting them to avoid being harmful to.Measuring transducer shell 100 has neck shape transition piece, fixedly holds the electronic device housing 200 of measurement instrument electronic installation 50 on it, referring to Fig. 1.
In the situation of the measuring transducer 10 of described embodiment, cause the elastic deformation of its measuring tube inner chamber 13A simultaneously in the lateral deflection of the vibration survey pipe 13 of inlet end 11 and endpiece 12 firm clamps, this distortion forms on the whole length of measuring tube 13 basically.In addition, because lever is provided with 15 moments of torsion that act on the measuring tube 13, on measuring tube 13, produce simultaneously around the distortion of measuring tube central shaft 13B with lateral deflection at least in part, thus the measuring tube 13 bending vibration torsional mode vibration to mix basically, and this pattern is as useful pattern.In this case, the distortion of measuring tube 13 can form like this, makes the lateral deflection of the lateral deflection of cantilever 154 and measuring tube 13 end apart and measuring tube 13 or in the same way or oppositely.So measuring tube 13 can be carried out torsional oscillation in the first crooked vibration torsional mode corresponding to situation in the same way; Perhaps in the second crooked vibration torsional mode, carry out torsional oscillation corresponding to inversion condition.So, in the embodiment of measuring transducer 10, so for example two times of second of the 900Hz crooked vibration torsional mode nature fundamental resonance frequency big first crooked vibration torsional mode.
Should only carry out the situation of the vibration of the second crooked vibration torsional mode during operation for measuring tube 13, be provided with 217 based on the electromagnetic brake of vortex principle and be integrated in the exciting bank 16, be used to stablize the position of described turning axle.So, utilize electromagnetic brake to be provided with 217, can guarantee measuring tube 13 always with the second crooked vibration torsional mode vibration, and therefore on measuring tube 13 possible external disturbance influence can not cause the spontaneous particularly first crooked vibration torsional mode of another kind that is converted to.The details of this electromagnetic brake setting specifies at US-A 60 06 609.
Be noted here that when measuring tube 13 deflects with the second crooked vibration torsional mode, virtual measurement tube hub axle 13B slight deformation, and thereby do not generate the plane in the duration of oscillation, but generate the curved surface of distortion slightly.In addition, the track of the mid point of measuring tube central shaft has minimum curvature in the track of being had a few of measuring tube central shaft in this curved surface.
For the deformation of check measurement pipe 13, measuring transducer 10 comprises that also sensor is provided with 60, and on behalf of first of this vibration, it produces by means of at least one first sensor 17 that the vibration of measuring tube 13 is reacted to some extent particularly simulate oscillation measurement signal s
1Sensor 17 can for example utilize the permanent magnetism armature and construct, this permanent magnetism armature be fixed on the measuring tube 13 and with the cell winding reciprocation of supporting frame 14 upper supports.For sensor 17, the particularly suitable deflection speed that is based on electric principle detection measuring tube 13.Yet, also can use the acceleration analysis electrodynamic transducer, perhaps even use deflection distance to measure or optical sensor.Certainly, also can use other sensor of checking this vibration that is applicable to known in the art.Sensor is provided with 60 and also comprises second sensor 18, and it is identical with first sensor 17 especially.Second sensor 18 sends the second oscillation measurement signal s that represents the vibration of measuring tube 13 equally
2In this embodiment, two sensors 17,18 are arranged in the measuring transducer 10 along measuring tube 13 separated from one anotherly, and the mid point of range observation pipe 13 distance equates especially.Sensor 17,18 is set like this, makes sensor that 60 vibrations that detect at the entrance side and the outlet side of measuring tube 13 are set locally, and these vibrations are reflected as corresponding oscillation measurement signal s respectively
1Or s
2The first measuring-signal s
1And also has the second measuring-signal s if necessary
2Usually each represents a signal frequency corresponding with the ringing frequency of measuring tube 13, and these two signals are admitted to measurement instrument electronic installation 50, as shown in Figure 2.
Have degree of amplitude modulation and adjustable excitation frequency f in order to make measuring tube 13 vibrate, to present to exciting bank 16
ExcThe exciting current i of same vibration
Exc, make drive coil 26,36 be flowed through by electric current during operation, and generate the required magnetic field of mobile armature 27,37 in the corresponding way.Exciting current i
ExcIt can be for example sinusoidal or rectangle.Preferably in described measuring transducer embodiment, select and regulate exciting current i like this
ExcExcitation frequency f
Exc, make the measuring tube 13 of swaying as far as possible only vibrate with the second crooked vibration torsional mode.
In order to generate and regulate exciting current i
Exc, measurement instrument electronic installation 50 comprises corresponding driving circuit 53, it is by representative excitation frequency f to be regulated
ExcFrequency adjustment signal y
FMAnd representative exciting current i to be regulated
ExcThe amplitude adjusted signal y of amplitude
AMControl.The baric flow converter that driving circuit can for example utilize voltage controlled oscillator to be connected with the downstream is realized; Yet, replace simulative generator, can also use numerically controlled digital oscillator to be used to regulate exciting current i
Exc
In order to produce amplitude adjusted signal y
AM, can for example use the amplitude control circuit 51 that is integrated in the measurement instrument electronic installation 50, it is based on two sensor signal s
1, s
2In at least one instantaneous amplitude and corresponding constant or variable amplitude reference value W
1And realization amplitude adjusted signal y
AMIf desired, also can the parametric excitation current i
ExcInstantaneous amplitude be used to generate amplitude adjusted signal y
AMThis amplitude control circuit is known equally for those skilled in the art.Example about this amplitude control circuit refers again to " PROMASS I " serial coriolis mass flowmeters.Its amplitude control circuit has advantage ground to be realized like this, makes the swaying of measuring tube 13 be controlled as constant amplitude, promptly irrelevant with density p.
About frequency adjustment signal y
FM, it can obtain from correspondent frequency control circuit 52, and it is for example at least based on sensor signal s
1And based on being used as correspondent frequency reference value W
2And represent the DC voltage of frequency and realize.
Have advantage ground, frequency control circuit 52 and driving circuit 53 are connected in the phaselocked loop together, and phaselocked loop is used in mode known in the art, based at sensor signal s
1, s
2In one of at least and exciting current i to be regulated or that measure
ExcBetween the phase differential that records, and with frequency adjustment signal y
FMFixedly be tuned to the transient resonance frequency of measuring tube 13.This being used for measuring tube with the structure of the phaselocked loop of their mechanical resonant frequency operation with use and for example detailed description is arranged at US-A 4,801 897.Certainly, also can use other frequency control circuit well known in the art, for example illustrated in US-A 45 24 610 or US-A 48 01 897.In addition, consider the use of this frequency control circuit of the measuring transducer of described type, with reference to already mentioned " PROMASS I " series.Can adopt other circuit that is applicable to driving circuit, for example US-A 58 69 770 or US-A 65 05 519.
In another embodiment of the present invention, digital signal processor DSP that utilization provides in measurement instrument electronic installation 50 and corresponding enforcement and the program code that moves are therein realized amplitude control circuit 51 and frequency control circuit 52.Program code can continue or even for example for good and all be stored in the nonvolatile memory EEPROM of microcomputer 55 of control and/or pilot signal processor, and for example can when signal processor DSP starts, be written in signal processor DSP among the volatile data memory RAM of integrated measurement instrument electronic installation 50.The signal processor that is applicable to this application for example is the model TMS320VC33 that can obtain from TexasInstruments Inc. company on market.
In fact, clearly utilize corresponding modulus converter A/D, can be to major general's sensor signal s
1And possible sensor signal s
2Be converted to digital signal corresponding, be used for handling at signal processor DSP; About this point, referring to EP-A 866 319.If desired, the conditioning signal that sends from signal processor, for example amplitude adjusted signal y
AMOr frequency adjustment signal y
FMAlso can be by digital-to-analog conversion in the corresponding way.
As shown in Figure 2, oscillation measurement signal x
S1, x
S2Also be fed to the metering circuit 21 of measurement instrument electronic installation.Metering circuit 21 can be any existing particularly digital measurement circuit, based on oscillation measurement signal x
S1, x
S2Determine mass rate; About this point, special referring to above-mentioned WO-A 02/37063, WO-A 99/39164, US-A 56 48 616, US-A 50 69074.Certainly, the metering circuit that other is applicable to Coriolis mass flowmeter known in the art also can be used, and these circuit measurings are also analyzed suitably at oscillation measurement signal x
S1, x
S2Between phase place and/or mistiming.Have advantage, metering circuit 21 can utilize signal processor DSP to realize equally.
Metering circuit 21 to small part is embodied as the fluid counter, is used for manner known in the art based on two oscillation measurement signal x
S1, x
S2Between the phase differential that detects and determine measured value corresponding to mass rate to be measured, wherein two oscillation measurement signals can be regulated as required in advance suitably.As already mentioned above, heterogeneity in the flow media, for example bubble that exists in the liquid and/or solid particle can cause being assumed to uniform dielectric and definite measured value is enough accurately not consistent with the actual mass flow in existing mode, that is, measured value need be proofreaied and correct suitably; So, in the simplest situation, this predetermined temporary transient representation quality flow or can be at oscillation measurement signal x corresponding to the measured value of mass rate at least
S1, x
S2Between exist and detected phase differential, this measured value is designated as the first intermediate value X ' below
mAnalytical electron device 21 is finally by this first intermediate value X '
mObtain mass flow measurement X
m, it is representation quality flow accurately enough.
About this point, discussed in the prior art, depend on measuring principle, this heterogeneity is shown as the variation in the density of being measured by flow media.Yet inventor's further investigation finds surprisingly, and is opposite with explanation of the prior art, intermediate value X '
mCorrection can carry out on the one hand by using the very simple correction factor of determining seldom, these correction factors can be from coriolis mass flowmeters as the definite flow parameter of measurement result, the density of Ce Lianging and/or be interim measurement mass rate and obtain and/or from by coriolis mass flowmeters usually directly measured operating parameter, the particularly Oscillation Amplitude of Ce Lianging, vibration frequency and/or exciting current and obtain at work here particularly.On the other hand, correction can be used predetermined density measurement X
ρAnd predetermined intermediate value X '
mCarry out, and contrast to comparatively complicated computing method to compare evaluation work quite little.
In order accurately to measure mass rate, analytical electron device 2 is from intermediate value X '
mObtain corresponding correction value X
K, and for intermediate value X '
mUse corrected value X
KAnd calculated mass flow measurements X digitally particularly
mFor example, can be based on following formula for the intermediate value X ' that determines with existing method basically
mProofread and correct:
X
m＝(1+X
K)·X
m′。(1)
According to the present invention, in order to determine suitable instantaneous correction value X
K, determine the second intermediate value X during operation
2The deviation or the non-uniform degree of testing liquid and ideal uniform are represented in for example gas phase that this second value representative exists in medium or liquid phase number percent or relative part and/or it.So the non-homogeneous concentration from measuring work or send to Coriolis mass flowmeter obtains corrected value X
K
According to the present invention, the analytical electron device is from intermediate value X
2Corrected value X is directly determined in beginning basically
K, because in the analytical electron device, be worth X between in practice
2With the corrected value X corresponding with it
KBetween mapping unique relation of particularly programming.For this reason, analytical electron device 2 also has table storer 56, wherein stores many predetermined digital correction values X
K, i, they for example pre-determine when demarcating Coriolis mass flowmeter.Metering circuit is used and is utilized the instantaneous effective second intermediate value X
2The storage address that obtains is directly visited suitable corrected value X
K, iTable storer 56 can for example use programmable read only memory, that is, and and RPGA (field programmable gate array), EPROM or EEPROM.In this case, corrected value X
K, iCan for example determine, with instantaneous definite intermediate value X in simple mode
2With the table storer in for intermediate value X
2The analog value of pre-stored compares, and reads and intermediate value X for the further calculating in the analytical electron device 2
2The corresponding corrected value X of immediate pre-stored value
K, iThis query correction value X that is used for
KThe use of table storer have the following advantages: calculated intermediate value X working time
2Can very rapidly utilize corrected value X afterwards
k
Except determining corrected value X
K, can also have advantage ground and use intermediate value X
2Be used for for example online or send the non-uniformity of signal indication fluid or the measured value that obtains thus with visual means, for example volume, quantity or the mass fraction of entrained solid particle in composition of air number percent in the fluid or the fluid in remote control room.
Many oscillation measurement signals and exciting current i according to measuring of carrying out for the liquid of disturbance in a predefined manner
ExcThe analysis of amplitude-time curve, also find exciting current i
ExcWith oscillation measurement signal x
S1, x
S2Can obviously fluctuate in time on the one hand, constant although condition keeps substantially, promptly in the basic situation that keeps constant steady flow liquid of constant density and viscosity and the bubble part of carrying secretly.Yet, also determine in fact uncertain fluctuation exciting current i on the other hand
Exc, oscillation measurement signal x
S1, x
S2, particularly their amplitude can have experiential standard deviation or experience dispersion degree s
p, itself and non-uniformity have very big correlativity.Therefore, in one embodiment of the invention, with intermediate value X
2Be defined as dispersion degree s for the mobile and/or running parameter of practical application selection
pFunction:
X
2＝f(s
p)。(2)
In this case, intermediate value X
2Can based on single flow and/or running parameter for example exciting current dispersion degree and flow and/or the combination of running parameter and determining based on a plurality of.
In order to determine intermediate value X
2And calculate specific dispersion degree s
pCan be in 1 operating period of Coriolis mass flowmeter m measured value a based on selected flow parameter or running parameter
iSampling AF and carry out according to following formula, wherein flow parameter for example is intermediate value X
KOr density measurement X
ρ, running parameter for example is exciting current i
ExcOr oscillation measurement signal x
S1, x
S2One of or other:
Wherein, a is corresponding to the mean value of estimating for sampling AF.For this reason, single measured value a
iCan be in volatibility number storage RAM for example by stored digital.When needed, be used for determining dispersion degree s
pSampling AF can for example be the sample sequence of amplitude curve of the running parameter of analogue measurement, for example exciting current i
ExcDigitized envelope a part or with the oscillation measurement signal x of corresponding manner storage
S1, x
S2One of.
Investigation shows, in order enough accurately to estimate dispersion degree s, only needs the sampling AF of reduced size, for example about 100～1000 measured value a
i, wherein single measured value also only need or be sampled in the time interval at about 1～2 second very narrow sample window.Correspondingly, about several KHz, for example low sample frequency of about 1～5kHz just will be enough.
Further find, for many application, intermediate value X
KCan be confirmed as with intermediate value as the separating of simple (particularly linearity or secondary) function of parameter, thus seldom some wet demarcate that (promptly using suitable test fluid flow) measurement points just are enough to determine to store for intermediate value X
KPreset value, can between these known points that for example use the least square method to determine by calibration experiment, finishing the table storer, and need not the further calibration measurements of remaining preset value by simple interpolation and/or extrapolation method.Yet,, proved intermediate value X for some application
KPreset value calculate as separating of arctan function or sine function and have advantage.In order to reduce calibration cost, intermediate value X
KPreset value determine that can have advantage ground carries out in the framework that type is demarcated, wherein adopt seldom actual measurement and preset value that (if necessary) calculates for the Coriolis mass flowmeter of same type.
In of the present invention further developing, the analytical electron device is based on density measurement X
ρAnd determine the deviation delta ρ of density of medium ρ and predetermined reference density based on predetermined or simultaneously-measured reference density value K ρ, wherein K ρ can be for example stores as steady state value between the starting period or is passed to coriolis mass flowmeters from the outside during operation at coriolis mass flowmeters.In order to generate corrected value X
K, the deviation delta ρ quilt of determining like this is according to the following funtcional relationship and the second intermediate value X
2In conjunction with
X
K＝Δρ·X
2 (4).
Reference density value K ρ can be based on for the understanding for the treatment of fluid measured and manually input, for example online input or from the remote control room input, perhaps it can for example be sent to the measurement instrument electronic installation via fieldbus from outside densitometer.
Yet, if fluid be single-phase or at least major part be uniformly, can utilize analytical electron device 21 directly to determine K ρ in advance for fluid.Correspondingly, according to another embodiment of the present invention, use the density measurement X that is stored in equally in the measurement instrument electronic installation
ρ, 0Determine reference density value K ρ, wherein Cun Chu density measurement X
ρ, 0Representative is in uniform dielectric or be assumed to the Media density of measuring in the uniform medium.In the further developing of this embodiment of the present invention, as the density measurement X of reference density value K ρ storage
ρ, 0Be used for before at the definite intermediate value X ' of nonhomogeneous media
mFollow-up correction.This embodiment of the present invention can for example use in the situation of feed or filling process in the mode that has advantage especially, wherein, once in the short time, there is significantly different flox condition in the measuring tube within the charging on the one hand, especially measuring tube not by the situation of complete filling in, and on the other hand, interested is to obtain total mass rate by whole charging, and the gross mass of the medium of the actual filling of special concern.
Above-mentioned function by formula (1)～(4) expression is used to generate mass flow measurement X
m, these functions can be realized in the AG 54 of measurement instrument electronic installation 50 at least in part.AG 54 can have advantage ground and for example utilize signal processor DSP equally or for example utilize above-mentioned microcomputer 55 and realize.Respective algorithms is corresponding to previous equations or represent the function of amplitude control circuit 51, frequency control circuit 52 and they are translated as executable program code in the sort signal processor, the structure of these algorithms and to implement these all be technology well-known to those skilled in the art and thereby do not need detailed explanation.Certainly, above-mentioned equation also can be realized wholly or in part by the simulation of corresponding discrete assembling in measuring electronic installation 50 and/or digital computing circuit.
Claims (10)
1. coriolis mass flowmeters, particularly Coriolis-type mass flowmeter/densimeter are used for the mass rate of two-phase or multiphase medium that measuring channel flows, and this coriolis mass flowmeters comprises:
-at least one inserts ducted measuring tube (11), and it is in operation by the MEDIA FLOW warp;
-supportive device (12), its be fixed to the inlet end of measuring tube (11) and endpiece and thereby clamping measuring tube oscillatorily;
-exciting bank (13), it makes measuring tube (11) carry out mechanical oscillation in operation, particularly crooked vibration;
-osciducer (141,142) is used for producing
--represent the first oscillation measurement signal (x of measuring tube (11) entrance side vibration
S1), and
--represent the second oscillation measurement signal (x of measuring tube (11) outlet side vibration
S2); With
-measure and operating electronic devices (2) its transmission
--drive the exciting current (i of exciting bank (13)
Exc) and
--represent the mass flow measurement (X of mass rate to be measured
m),
-wherein measure and operating electronic devices (2)
--produce from oscillation measurement signal (x
S1, x
S2) obtain first intermediate value corresponding to mass rate to be measured (X '
m) and be used for first intermediate value (X '
m) corrected value (X
K), and
--utilize first intermediate value (X '
m) and corrected value (X
K) determine mass flow measurement (X
m),
-wherein measure and operating electronic devices (2) by using at least one second intermediate value (X
2) and produce corrected value (X
K),
--this second intermediate value is from least one oscillation measurement signal (x
S1, x
S2) and/or from exciting current (i
Exc) obtain, and
--this second intermediate value is represented the ratio of a phase part of medium,
-wherein measure and operating electronic devices (2)
--have table storer (56), wherein stored digital is a plurality of for corrected value (X
K) discrete preset value, and
--in order to determine corrected value (X
K) and use one of preset value, this preset value is to use the second intermediate value (X
2) and from table storer (56), read.
2. according to the coriolis mass flowmeters of claim 1,
-analytical electron device (2) sends density measurement (X
ρ), it is from the first and/or second oscillation measurement signal (x
S1, x
S2) obtain and represent density of medium, and
-analytical electron device (2) also utilizes density measurement (X
ρ) determine corrected value (X
K).
3. according to the coriolis mass flowmeters of aforementioned arbitrary claim, wherein analytical electron device (2) utilizes the second intermediate value (X
2) determine to be used as instantaneous correction value (X in the table storer
K) the storage address of preset value.
4. according to the coriolis mass flowmeters of aforementioned arbitrary claim, the second intermediate value (X wherein
2) be based at least the dispersion degree of the following parameter of determining at interval for preset time and definite: exciting current (i
Exc) amplitude, oscillation measurement signal (x
S1, x
S2) amplitude, oscillation measurement signal (x
S1, x
S2) oscillation frequency, density measurement and/or first intermediate value (X '
m).
5. according to the coriolis mass flowmeters of aforementioned arbitrary claim, wherein analytical electron device (2) is determined mass flow measurement (X based on following funtcional relationship
m):
X
m＝(1+X
K)·X
m′.
6. a method is used to utilize coriolis mass flowmeters, and particularly Coriolis-type mass flowmeter/densimeter generates the measured value (X of the physical measurement variable of representing the medium that flows in the pipeline
m), the mass flow measurement of representation quality flow particularly, this method may further comprise the steps:
-make coriolis mass flow meter measurement pipe (11) vibration that medium flows through, particularly crooked vibration;
-detect the vibration of measuring tube (11), and generate the first oscillation measurement signal (x that represents the entrance side vibration
S1) and represent the second oscillation measurement signal (x of outlet side vibration
S2);
Two oscillation measurement signal (x of-use
S1, x
S2) obtain particularly corresponding to mass rate first intermediate value (X '
m);
-particularly utilize two oscillation measurement signal (x
S1, x
S2) at least one, determine the second intermediate value (X
2);
Second intermediate value (the X of the phase ratio partly of medium is represented in-utilization
2), produce for intermediate value (X '
m) corrected value (X
K); And
-utilize corrected value (X
K) the correction intermediate value (X '
m);
-wherein by using the second intermediate value (X
2) and use the table storer and definite like this corrected value (X
K), promptly based on the second intermediate value (X
2) the instantaneous corrected value (X that is used for of identification
K) preset value and read this preset value from table the storer, it is a plurality of for corrected value (X wherein to show in the storer stored digital
K) discrete preset value.
7. according to the method for claim 6, further comprising the steps of: according to measuring-signal (x
S1, x
S2) obtain as measured value (X
m) mass flow measurement, it represents the mass rate of medium.
8. according to the method for claim 6 or 7, further comprising the steps of:
-according to measuring-signal (x
S1, x
S2) obtain representing the second measured value (X of Media density
ρ); And
-use second measured value (the X
ρ) obtain corrected value (X
K).
9. according to the method for one of claim 6～8, further comprising the steps of:
-make exciting current (i
Exc) the motor exciting bank (13) with measuring tube (11) mechanical couplings of flowing through, to cause measuring tube (11) vibration; With
-by considering exciting current (i
Exc) and determine the second intermediate value (X
2).
10. according to the method for one of claim 6～9, the second intermediate value (X wherein
2) represent at least one dispersion degree, it is the measured value of determining for the medium that flows in the pipeline at interval at the fixed time, particularly measure mass rate, density measurement, measurement viscosity and definite dispersion degree, and/or at the fixed time at interval in for the running parameter, particularly oscillation measurement signal (x of coriolis mass flowmeters
S1, x
S2) amplitude or oscillation measurement signal (x
S1, x
S2) oscillation frequency and definite dispersion degree.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10358663.6 | 2003-12-12 | ||
| DE10358663.6A DE10358663B4 (en) | 2003-12-12 | 2003-12-12 | Coriolis mass flow measuring device |
| DE102004007889.0 | 2004-02-17 |
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| Publication Number | Publication Date |
|---|---|
| CN1894561A true CN1894561A (en) | 2007-01-10 |
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| CNB200480036981XA Expired - Fee Related CN100507466C (en) | 2003-12-12 | 2004-12-07 | Coriolis mass flowmeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102401774A (en) * | 2010-08-24 | 2012-04-04 | 克洛纳有限公司 | Method for measuring viscosity of medium with coriolis volume flow measuring device |
| CN103052868A (en) * | 2010-08-02 | 2013-04-17 | 西门子公司 | Coriolis mass flowmeter and method for operating a coriolis mass flowmeter |
| CN103175582A (en) * | 2011-12-21 | 2013-06-26 | 新奥科技发展有限公司 | Fluid metering method and fluid metering device |
| CN104949741A (en) * | 2015-06-29 | 2015-09-30 | 安徽汉威电子有限公司 | Full-automatic flow measuring device of water meter |
| CN108088502A (en) * | 2017-12-19 | 2018-05-29 | 中曼石油天然气集团股份有限公司 | The device and its measuring method of measurement accuracy are improved in a kind of ground During Oil Testing Process |
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| US5469748A (en) * | 1994-07-20 | 1995-11-28 | Micro Motion, Inc. | Noise reduction filter system for a coriolis flowmeter |
| US5555190A (en) * | 1995-07-12 | 1996-09-10 | Micro Motion, Inc. | Method and apparatus for adaptive line enhancement in Coriolis mass flow meter measurement |
| DE19652002C2 (en) * | 1995-12-15 | 2003-03-27 | Flowtec Ag | Vibration meter |
| CN1178048C (en) * | 1998-12-11 | 2004-12-01 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Coriolis-type mass flowmeter/densimeter |
-
2003
- 2003-12-12 DE DE10358663.6A patent/DE10358663B4/en not_active Expired - Fee Related
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2004
- 2004-12-07 CN CNB200480036981XA patent/CN100507466C/en not_active Expired - Fee Related
- 2004-12-07 CN CNA2004800368605A patent/CN1890537A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1890537A (en) | 2007-01-03 |
| CN100507466C (en) | 2009-07-01 |
| DE10358663B4 (en) | 2015-11-26 |
| DE10358663A1 (en) | 2005-07-07 |
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