CN101311687B - Diagnostic device and method for coriolis flowmeter - Google Patents

Diagnostic device and method for coriolis flowmeter Download PDF

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CN101311687B
CN101311687B CN2008100993502A CN200810099350A CN101311687B CN 101311687 B CN101311687 B CN 101311687B CN 2008100993502 A CN2008100993502 A CN 2008100993502A CN 200810099350 A CN200810099350 A CN 200810099350A CN 101311687 B CN101311687 B CN 101311687B
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flow
flowmeter
density
various modes
flow velocity
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CN101311687A (en
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C·P·斯塔克
A·T·帕滕
M·A·布特勒
G·R·杜菲尔
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Micro Motion Inc
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Abstract

The embodiment of the present invention provides a system which calculates the flow rates of flow meters by adopting a plurality of modes, comprising a device which calibrates the flow meter for a plurality of ideal modes, a device which confirms the density of substances which are relevant to the ideal modes and flow through the flow meter, further a device which confirms the effects that flow rates have on density for a plurality of ideal modes and a device which calculates the flow rates on the basis of the effects which the density and flow rates of the ideal modes have on the density values.

Description

The diagnostic device and the method that are used for coriolis flowmeter
The present patent application is to be that September 29, application number in 2003 are that of 03827137.0 patented claim of the same name divides an application the applying date.
Technical field
The present invention relates to be used for the diagnostic device and the method for coriolis flowmeter.
Background technology
As the U.S. Patent No. 4 that was presented to people such as J.E.Smith on January 1st, 1985,491,025 and be presented to the Re.31 of J.E.Smith February 11 nineteen eighty-two, disclosed in 450, be known that the mass rate and the out of Memory that use the coriolis mass flowmeters measurement to flow through the material of pipeline.These flowmeters have one or more stream pipes of different structure.Each guide-tube structure can be counted as having one group of eigentone, described eigentone for example comprises simple bending, reverses, radially with the pattern of coupling.In typical Coriolis mass flow measurement application, when flow of material is crossed conduit, encourage guide-tube structure, and measure moving of described conduit at the some place that separates along described conduit with one or more vibration modes.
The vibration mode of material fill system is partly limited by the combination quality of the material in described stream pipe and the described stream pipe.Material flows into described flowmeter from the pipeline that the entrance side of described flowmeter connects.Then, described material is guided through a described stream pipe or a plurality of stream pipe, and leaves described flowmeter to the pipeline that connects on outlet side.
Driver applies power to described stream pipe.Described power makes the vibration of stream pipe.When not having flow of material to cross described flowmeter, the have a few of longshore current pipe is with identical phase oscillation.When material began to flow through described stream pipe, Coriolis acceleration caused along each of described stream pipe to have different phase places with respect to other point along described stream pipe.Phase place at the entrance side of described stream pipe lags behind described driver, and is ahead of described driver in the phase place of outlet side.The difference that sensor is placed on the described stream pipe is sentenced the generation sinusoidal signal, and described sinusoidal signal is illustrated in the motion that the stream pipe is stated in the difference place.The phase differential of the signal that calculating received from described sensor in the unit interval.
Phase differential between described sensor signal is proportional with the mass velocity of the material that flows through a described stream pipe or a plurality of stream pipes.The mass velocity of described material is determined by phase differential be multiply by flow calibration factor.Described flow calibration factor is determined by calibration process.In described calibration process, known fluid passes through described stream pipe with given flow velocity, and calculates the ratio between phase differential and described flow velocity.
An advantage of coriolis flowmeter is not have movable part in the stream pipe of vibration.Described flow velocity is that upward the phase differential and the flow calibration factor of point-to-point transmission multiply each other to determine by flowing pipe.Described phase differential is to calculate according to the sinusoidal signal that receives from described sensor, 2 vibration on the described sinusoidal signal indication stream pipe.The material of described flow calibration factor and described stream pipe and xsect characteristic are proportional.Therefore, the measurement of described phase differential and described flow calibration factor are not subjected to the influence of the wearing and tearing of movable part in the flowmeter.
Yet material behavior, xsect characteristic and hardness that problem is to flow pipe can change at the duration of work of coriolis flowmeter.The change of the material behavior of described stream pipe, xsect characteristic and hardness can be caused by erosion, corrosion and coating, change piping erection and the temperature of the material that flows flow tube to described stream pipe.An example of the xsect characteristic changing of described stream pipe is the change of the moment of inertia that causes of the corrosion by described stream pipe.Second example of the material of described stream pipe and xsect characteristic changing is the increase of the stream pipe quality that the coating of described stream pipe caused by the material that flows through described pipe and the minimizing of cross-sectional area.The change of the material behavior of described stream pipe, xsect characteristic and hardness can change the flow and the Density Calibration factor of described flowmeter.If change has taken place the flow calibration factor of described flowmeter, the flow velocity that then uses original flow calibration factor to calculate is inaccurate.Therefore, need a kind of system in the prior art, it detects the possible change of material behavior, xsect characteristic and the hardness of described stream pipe, and described change indication may be inaccurate by the measured mass velocity of coriolis flowmeter.
Summary of the invention
By providing a kind of system to solve above-mentioned and other problem and realize the progress of prior art, described system verifies the integrality of (validate) coriolis flowmeter by the various parameters of determining and relatively comprise mass rate and density.For example, people's such as Buttler on the 11st U.S. Patent No. 5,687,100 was disclosed as November in 1997, based on mass rate mass rate and density was determined in the influence of frequency.
According to embodiments of the invention, provide a kind of method of using the flow velocity of various modes calculated flow rate meter.The method of the flow velocity of described use various modes calculated flow rate meter comprises for the described flowmeter of a plurality of ideals (desired) model calibration.The method of the flow velocity of described use various modes calculated flow rate meter comprises the density of determining the material that flow through described flowmeter relevant with each pattern.The method of the flow velocity of described use various modes calculated flow rate meter further comprises for each idealized model determines the influence of flow velocity to density.Described density and flow velocity that the method for the flow velocity of described use various modes calculated flow rate meter further comprises based on each idealized model calculate flow velocity to the influence of density value.
According to embodiments of the invention, provide a kind of method of using various modes checking flowmeter.The method of described use various modes checking flowmeter comprises determines the flow velocity relevant with each idealized model.The method of described use various modes checking flowmeter comprises more described flow velocity and in response to the described error condition that relatively detects.
According to embodiments of the invention, provide a kind of method of using various modes checking flowmeter.The method of described use various modes checking flowmeter comprises the density of determining the material relevant with each idealized model.The method of described use various modes checking flowmeter comprises the comparison described density value relevant with each pattern and in response to the described error condition that relatively detects.
According to embodiments of the invention, provide a kind of method of using various modes checking flowmeter.The method of described use various modes checking flowmeter comprises for a plurality of idealized models calibrates described flowmeter.The method of described use various modes checking flowmeter comprises the density of determining the material that flow through described flowmeter relevant with each pattern.The method of described use various modes checking flowmeter further comprises for each idealized model determines the influence of flow velocity to density.The method of described use various modes checking flowmeter further comprises described density and flow velocity according to each idealized model calculate each idealized model to the influence of density value flow velocity.The method of described use various modes checking flowmeter further comprises more described flow velocity and in response to the described error condition that relatively detects.
According to embodiments of the invention, provide a kind of method of using various modes checking flowmeter.Described method comprises for a plurality of idealized models calibrates described flowmeter.After calibration, determine the influence of flow velocity to density for each idealized model.Known of the influence of the flow velocity of each idealized model, so can calculate the flow velocity compensation density of each idealized model to density value.Then density value is compared, and in response to the described error condition that relatively detects.
According to embodiments of the invention, provide a kind of method of temperature of using various modes to determine flow of material.Described method comprises for a plurality of idealized models calibrates described flowmeter to find out (ascertain) calibration constants.After calibration, for each idealized model computer tube cycle.Use the described calibration constants and the pipe cycle of each pattern, can determine the temperature of described flow of material.
According to embodiments of the invention, provide a kind of system that uses the flow velocity of various modes calculated flow rate meter.The system of the flow velocity of described use various modes calculated flow rate meter comprises the described flowmeter of device calibrate to(for) a plurality of idealized models.The system of the flow velocity of described use various modes calculated flow rate meter comprises the device of the density of determining the material that flow through described flowmeter relevant with each pattern.The system of the flow velocity of described use various modes calculated flow rate meter further comprises for each idealized model and determines the device of flow velocity to the influence of density.The system of the flow velocity of described use various modes calculated flow rate meter further comprises the device that the influence of density value is calculated flow velocity based on the described density of each idealized model and flow velocity.
According to embodiments of the invention, provide a kind of system that uses various modes checking flowmeter.The system of described use various modes checking flowmeter comprises the device of determining the flow velocity relevant with each idealized model.The system of described use various modes checking flowmeter comprises that further comparison is for the device of the determined flow velocity of each pattern and in response to comparing the device that the density value relevant with each idealized model detects error condition.
According to embodiments of the invention, provide a kind of system that uses various modes checking flowmeter.The system of described use various modes checking flowmeter comprises the device of the density of determining the flow of material relevant with each idealized model.The system of described use various modes checking flowmeter comprises the device of more described density value.The system of described use various modes checking flowmeter further comprises the device that detects error condition in response to density value relatively.
According to embodiments of the invention, provide a kind of system that uses various modes checking flowmeter.The system of described use various modes checking flowmeter comprises the device for a plurality of idealized model calibrating flow meters.The system of described use various modes checking flowmeter further comprises the device of the density of determining the material that flow through described flowmeter relevant with each pattern.The system of described use various modes checking flowmeter further comprises for each idealized model and determines the device of flow velocity to the influence of density.The system of described use various modes checking flowmeter further comprises the device that calculates flow velocity for each idealized model.The system of described use various modes checking flowmeter further comprises the device of more described flow velocity and the device that detects error condition in response to the flow speed value that is compared.
According to embodiments of the invention, provide a kind of system that uses various modes checking flowmeter.The system of described use various modes checking flowmeter comprises the described flowmeter of device calibrate to(for) a plurality of idealized models.The system of described use various modes checking flowmeter comprises the device of the flow velocity of definite each idealized model to the influence of density.The system of described use various modes checking flowmeter further comprises the device that calculates the flow velocity compensation density for each idealized model.The system of described use various modes checking flowmeter further comprises the device of more described density value and the device that detects error condition in response to the density value that is compared.
According to embodiments of the invention, provide a kind of system that uses various modes to determine the temperature of flow of material.Described use various modes is determined that the system of the temperature of flow of material comprises for a plurality of idealized models and is calibrated described flowmeter to find out the device of calibration constants.Described use various modes determines that the system of the temperature of flow of material comprises the pipe cycle of device determine to(for) each idealized model.Described use various modes determines that the system of the temperature of flow of material further comprises the described calibration constants that uses each pattern and pipe cycle and determines the device of flow of material temperature.
Description of drawings
Fig. 1 illustrates the coriolis flowmeter in the example of the present invention;
Fig. 2 illustrates the verification system in the example of the present invention;
Fig. 3 illustrates the verification system in the example of the present invention;
Fig. 4 illustrates the process that is used for determining flow velocity in the example of the present invention;
Fig. 5 illustrates the verification system in the example of the present invention;
Fig. 6 illustrates the verification system in the example of the present invention; And
Fig. 7 illustrates the process that is used for temperature in the example of the present invention.
Embodiment
Best mode of the present invention is realized and used to Fig. 1-7 and the following specific example of declarative description how with the instruction those skilled in the art.In order to instruct the purpose of the principle of the invention, some conventional aspects are simplified or omit.Those skilled in the art will recognize the variation according to these examples that is in the scope of the invention.For the purpose of brief, described example uses two kinds of patterns to express below.Be to be understood that the pattern that to use more than two kinds.Those skilled in the art will recognize that the feature that is described below can be combined in every way to form multiple variation of the present invention.Therefore, the invention is not restricted to specific examples described below, but only limit by claims and equivalent thereof.
Fig. 1 illustrates a coriolis flowmeter 5, and it comprises gauge assembly 10 and meter electronic apparatus 20.The mass velocity and the density of 10 pairs of treated substances of gauge assembly respond.Meter electronic apparatus 20 through lead 100 be connected to gauge assembly 10 with on path 26, provide density, mass velocity and temperature information and with the incoherent out of Memory of the present invention.Although it is evident that to those skilled in the art, the present invention can be implemented as vibrating tube densimeter and not have by the additional measurement performance that coriolis mass flowmeters provided, but has described the structure of coriolis flowmeter.
Gauge assembly 10 comprise a pair of manifold (manifold) 150 and 150 ', have flange (flange) neck 110 and 110 ' flange 103 and 103 ', pair of parallel stream pipe 130 and 130 ', driving mechanism 180, temperature sensor 190 and a pair of speed pickup 170L and 170R.Two straight basically inlet arms (leg) 131 and 131 of stream pipe 130 and 130 ' have ' and outlet stool 134 and 134 ', they are at stream pipe installing component 120 and 120 ' locate to assemble toward each other.Stream pipe 130 and 130 ' in two symmetric position place bendings along its length, and on its whole length, be parallel basically.Strut 140 and 140 ' be used for limiting axle W and W ', each stream circumference of cannon bone is around described axle vibration.
With stream pipe 130 and 130 ' side branch 131,131 ' and 134,134 ' be fixedly attached to stream pipe installing component 120 and 120 ', and with these parts be fixedly attached to again manifold 150 and 150 '.This provides continuous closed material path in Coriolis metering assembly 10.
Have hole 102 and 102 ' flange 103 and 103 ' via inlet end 104 and endpiece 104 ' when being connected into production line (process line) (not shown), described production line transmits just measured treated substance, and the material that the mouth of pipe 101 by flange 103 enters the end 104 of described flowmeter is guided through manifold 150 to the stream pipe installing component 120 with surface 121.In manifold 150, described material cut apart and be transmitted wear flow tube 130 and 130 '.In case leave stream pipe 130 and 130 ', described treated substance is single current manifold 150 ' interior just reconfiguring, and after this be transmitted leave end 104 ', described end 104 ' by have bolt hole 102 ' flange 103 ' be connected to production line (not shown).
Stream pipe 130 and 130 ' selected and suitably be installed to stream pipe installing component 120 and 120 ' on so that have substantially the same mass distribution, moment of inertia and Young modulus respectively around bending axis W-W and W '-W '.These bending axis process struts 140 and 140 '.Because the Young modulus of described stream pipe changes with temperature, and the calculating of this variable effect flow and density, so being installed to stream, resistance temperature detector (RTD) 190 manages 130 ' upward temperature with the described stream pipe of continuous coverage.The temperature of described stream pipe and therefore go up voltage and decide by the temperature of the material by described stream pipe for the RTD that appears at that gives constant current by it.In well-known method, the stream pipe 130 and 130 that meter electronic apparatus 20 uses the voltage that appears at the temperature correlation on the RTD to compensate any variation by stream pipe temperature to cause ' the variation of elastic modulus.Described RTD is connected to meter electronic apparatus 20 by lead 195.
Stream pipe 130 and 130 ' bending axis W and W ' drive in the opposite direction and with the first out-phase beam mode cause driver 180 that is called as described flowmeter separately around them.This driving mechanism 180 can comprise any in many well-known devices, for example be installed to stream pipe 130 ' on magnet and be installed to stream and manage relative coil on 130, and by described coil, alternating current is transmitted to be used to vibrate these two stream pipes.Meter electronic apparatus 20 imposes on driving mechanism 180 through lead 185 with suitable drive signal.
Meter electronic apparatus 20 receives the RTD temperature signal on the leads 195 and appears at a left side and right rate signal on lead 165L and the 165R respectively.Meter electronic apparatus 20 is created on the lead 185 drive signal that occurs, with driver part 180 and make pipe 130 and 130 ' vibration.Meter electronic apparatus 20 is handled a left side and right rate signal and RTD signal, to calculate mass velocity and the density by the material of gauge assembly 10.This information imposes on application apparatus 29 by meter electronic apparatus 20 through path 26 together with out of Memory.
Coriolis flowmeter 5 vibrates with its resonance frequency, so that make flowmeter 5 can measure quality and density.Mass measurement is based on following formula:
Figure S2008100993502D00071
Wherein:
Figure S2008100993502D00072
It is mass velocity;
FCF is a flow calibration factor;
Δ t is a time delay; And
Δ t 0It is time delay at the zero flow place.
The hardness of FCF item and described flowmeter is proportional.Hardness is the major parameter of the described flowmeter performance of influence.In other words, if the stiffness changing of described flowmeter, then the FCF of described flowmeter will change.The change of described flowmeter performance can be caused by burn into erosion and coating.
In order to reflect described hardness, formula (1) can be rewritten as:
Figure S2008100993502D00081
Wherein:
G is the geometric constant relevant with concrete sensor;
E is a Young modulus; And
I is a moment of inertia.
When the stream pipe of described flowmeter changed, area (area) moment of inertia I changed.For example, if the corrosion of described pipe reduces wall thickness, then described area moment of inertia I is lowered.
Fig. 2 illustrates the process 200 of variation of the flow velocity of the variation that is used to detect and distinguish flowmeter structure and indication.Process 200 is to use various modes to determine mass velocity in step 210 and 220 according to following formula
Figure S2008100993502D00082
Beginning:
Figure S2008100993502D00083
When by hydrodynamic noise or forced vibration excitation various modes, the vibration of described pattern will be coupled with the mass rate by described stream pipe, thereby causes the Coriolis response for each pattern.Described Coriolis response produces relevant Δ t, and described Δ t is used to calculate the mass rate reading of each pattern.
Step 230 is the mass rate reading of each pattern relatively.The mass velocity of gained must be identical for each pattern.If described mass rate reading equates that then step 250 produces " proper operation " signal, and this process is restarted in step 210.Described " proper operation " signal can be the form with the visible signal that maybe can hear of user.
When in the deviation that has taken place between described mass velocity outside tolerable limit, then in step 240, produce error signal.The error signal that is produced in step 240 can cause that exercises take place.For example, described error signal can make this process be stopped, the operator's that perhaps can give a warning the visible signal that maybe can hear, and this operator takes suitable action then.
The density measure of coriolis flowmeter 5 is based on following formula:
2 πf = 2 π τ = k m - - - ( 4 )
Wherein:
K is the hardness of assembly;
M is the quality of assembly;
F is the frequency of vibration; And
τ is a period of oscillation.
Formula (4) is the separating of the equation of motion that is used for single-mode system.Coriolis flowmeter is represented by the expansion of formula (4) at the zero flow place, thereby is obtained:
2 π τ = EIG ρ ρ f A f + ρ t A t - - - ( 5 )
Wherein:
E is a Young modulus;
I is the moment of inertia of xsect;
Figure S2008100993502D00093
It is geometric constant;
A is a cross-sectional area;
Figure S2008100993502D00094
Be density;
F represents the fluid in the flowmeter; And
T represents the material of described stream pipe.
Every by rearranging, formula (5) can be rewritten as:
ρ f＝C 1τ 2-C 2 (6)
Wherein:
C 1 = G ρ EI 4 π 2 A f , And (7)
C 2 = ρ t A t A f - - - ( 8 )
Geometric constant
Figure S2008100993502D00103
Geometric parameter explanation such as length of tube and the shape.As at the zero flow place to the part of the standard calibration process of two kinds of different fluid, determine constant C 1And C 2
Fig. 3 illustrates the process 300 that is used to detect and distinguish the variation of flowmeter structure and indicates the variation of density.Process 300 is determined density to use various modes in step 310 and 320
Figure S2008100993502D00104
Beginning.Can encourage various modes by hydrodynamic noise or forced vibration.
Step 330 is the density readings of each pattern relatively.The density readings of gained must be identical for each pattern.If described density readings equates that then step 350 produces " proper operation " signal, and this process is restarted in step 310.Described " proper operation " signal can be the form with the visible signal that maybe can hear of user.
When in the deviation that has taken place between described density readings outside tolerable limit, then in step 340, produce error signal.The error signal that is produced in step 340 can cause that exercises take place.For example, described error signal can make this process be stopped, the operator's that perhaps gives a warning the visible signal that maybe can hear, and this operator takes suitable action then.
Except the method for describing in formula (1) that is used for definite mass rate, density also can be used to the calculated mass flow.As more abundant description in people such as the Buttler U.S. Patent No. 5,687,100 on November 11st, 1997, the second order flow is added into formula (6) to the influence of density item, thereby produces:
Figure S2008100993502D00105
Wherein:
Figure S2008100993502D00111
It is mass velocity; And
FD is the influence of flow to density constant.
Described FD item is a constant for all flow velocitys and all density of the given vibration shape (mode shape), yet described FD item is different for each vibration shape with the pipe physical dimension.
When driving flowmeter 5 with various modes or measuring various modes, can derive a plurality of formula and a plurality of unknown quantity.For example, under the situation with two kinds of mode activated flowmeters 5, density formula is written as follows:
Figure S2008100993502D00112
Figure S2008100993502D00113
Wherein:
A is a first vibration mode;
B is a second vibration mode;
C 1aτ a 2-C 2aBe
Figure S2008100993502D00114
Promptly use the real density of pattern a;
C 1bτ b 2-C 2bBe
Figure S2008100993502D00115
Promptly use the real density of pattern b;
Figure S2008100993502D00116
It is the real density of the influence of density measure being proofreaied and correct for flow; And
Figure S2008100993502D00117
It is the real density of the influence of density measure being proofreaied and correct for flow.
Formula (10) and (11) are use at the zero flow place that two kinds of patterns proofread and correct flow effect two independently density readings.Because
Figure S2008100993502D00118
With
Figure S2008100993502D00119
Equate, so formula (10) and (11) can be combined to form:
Figure S2008100993502D001110
For single current path, m a=m bThereby, cause separating of mass rate to as follows:
Figure S2008100993502D00121
Fig. 4 illustrates the process 400 that is used for determining based on density mass rate.Process 400 is with use pattern " a " in step 410 and 5 beginnings of " b " calibrating flow meter.Use two kinds of just empty G﹠Ws of different fluid densities, described calibration process is determined constant C 1a, C 2a, C 1bAnd C 2b
Step 420 is determined density value according to top formula (6)
Figure S2008100993502D00122
With
Figure S2008100993502D00123
Step 430 relatively
Figure S2008100993502D00124
With To determine whether described density value is consistent.If density value is inconsistent, then must in step 410, carry out calibration once more.If the density value unanimity, then step 440 and 450 is identified for the relevant FD value of pattern " a " and " b ".In case the FD value is determined, then in step 460, use formula (13) calculated mass flow.
Determine above
Figure S2008100993502D00126
Value also can be used to determine when change in described flowmeter.Fig. 5 illustrates the process 500 of variation of the flow velocity of the variation that is used to detect and distinguish flowmeter structure and indication.Process 500 is determined mass velocity with the step 460 from Fig. 4 in step 510
Figure S2008100993502D00127
Beginning.
Step 520 is calculated conventional mass velocity according to formula (1)
Figure S2008100993502D00128
And in step 530, compare With
Figure S2008100993502D001210
If described mass rate reading equates that then step 550 produces " proper operation " signal, and this process is restarted in step 510.Described " proper operation " signal can be the form with the visible signal that maybe can hear of user.
When in the deviation that has taken place between described mass rate reading outside tolerable limit, then in step 540, produce error signal.The error signal that is produced in step 540 can cause that exercises take place.For example, described error signal can make this process be stopped, the operator's that perhaps gives a warning the visible signal that maybe can hear, and this operator takes suitable action then.
Determine above
Figure S2008100993502D001211
With Value also can be used to determine when change in described flowmeter.Fig. 6 illustrates the process 600 of the variation that is used to detect and distinguish flowmeter structure and the variation of the indication density of proofreading and correct for flow rate effect.
Process 600 is with use pattern " a " in step 610 and 5 beginnings of " b " calibrating flow meter.Use two kinds of just empty G﹠Ws of different fluid densities, described calibration process is determined constant C 1a, C 2a, C 1bAnd C 2bShould be appreciated that, can use various modes, and to use two kinds of patterns in this example only be for illustrative purposes.
The relevant FD value of step 620 deterministic model " a " and " b " in case described FD value is determined, then uses formula (10) and (11) to calculate in step 630
Figure S2008100993502D00131
With
Figure S2008100993502D00132
Step 640 is density readings relatively
Figure S2008100993502D00133
With Density readings must be identical for each pattern.If described density readings equates that then step 660 produces " proper operation " signal, and this process is restarted in step 620.Described " proper operation " signal can be the form with the visible signal that maybe can hear of user.
When in the deviation that has taken place between described density readings outside tolerable limit, then in step 650, produce error signal.The error signal that is produced in step 650 can cause that exercises take place.For example, described error signal can make this process be stopped, the operator's that perhaps gives a warning the visible signal that maybe can hear, and this operator takes suitable action then.
The definite temperature that also can be used to find out flow of material of multi-mode density.Density as the function of temperature is represented according to following formula:
ρ n＝C 1n*τ 2(1-0.0004T)+C 2n (14)
Wherein:
Figure S2008100993502D00135
Be to use the temperature compensation density of pattern n;
C1n is to use first constant of pattern n;
C2n is to use second constant of pattern n;
τ is the pipe cycle; And
T is the temperature of flow of material.
Use various modes, use formula (14) can find out the temperature of flow of material.For example, use two kinds of mode of operations, formula (14) can be represented as two formula:
ρ 1＝C 11*τ 2(1-0.0004T)+C 21 (15)
ρ 2＝C 12*τ 2(1-0.0004T)+C 22 (16)
Because
Figure S2008100993502D00136
With
Figure S2008100993502D00137
Equate, so formula (15) and (16) are written as:
( 1 - 0.0004 T ) = C 22 - C 21 C 11 τ 2 2 - C 12 τ 2 2 - - - ( 17 )
T found the solution obtains:
T = ( 1 - C 22 - C 21 C 11 τ 1 2 - C 12 τ 2 2 ) 1 0.0004 - - - ( 18 )
Fig. 7 illustrates the process 700 of determining to find out the flow of material temperature based on multi-mode density.Process 700 is with use pattern " 1 " in step 710 and 5 beginnings of " 2 " calibrating flow meter.Use two kinds of just empty G﹠Ws of different fluid densities, described calibration process is determined constant C 11, C21, C12 and C22.
Step 720 is determined density value according to top formula (15) and (16)
Figure S2008100993502D00143
With Step 730 relatively
Figure S2008100993502D00145
With
Figure S2008100993502D00146
To determine whether described density value is consistent.If density value is inconsistent, then must carry out calibration in step 710 once more.If density value unanimity, the then relevant pipe periodic quantity of step 740 deterministic model " 1 " and " 2 ".In case the pipe periodic quantity is determined, and then uses formula (18) accounting temperature in step 750.

Claims (2)

1. a method of using the flow velocity of various modes calculated flow rate meter comprises the following steps:
Calibrate described flowmeter for each desirable vibration mode;
Determine the density value of the material that flow through described flowmeter relevant with each desirable vibration mode;
Determine the influence of flow velocity for each desirable vibration mode to density value; And
Use the described density value and the flow velocity of each desirable vibration mode that flow velocity is calculated in the influence of density value.
2. system that uses the flow velocity of various modes calculated flow rate meter comprises:
Calibrate the device of described flowmeter for each desirable vibration mode;
Determine the device of the density value of the material that flow through described flowmeter relevant with each desirable vibration mode;
Determine the device of flow velocity for each desirable vibration mode to the influence of density value; And
Use the described density value of each desirable vibration mode and flow velocity calculates flow velocity to the influence of density value device.
CN2008100993502A 2003-09-29 2003-09-29 Diagnostic device and method for coriolis flowmeter Expired - Lifetime CN101311687B (en)

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HK09101572.5A HK1121804A1 (en) 2003-09-29 2007-03-16 Diagnostic apparatus and methods for a coriolis flow meter

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041127C (en) * 1986-10-03 1998-12-09 微动公司 Density insensitive coriolis mass flow rate meter
CN1047844C (en) * 1993-09-11 1999-12-29 安德雷斯和霍瑟弗罗泰克股份公司 Coriolis mass flow sensor with helical measurement tube
US6092409A (en) * 1998-01-29 2000-07-25 Micro Motion, Inc. System for validating calibration of a coriolis flowmeter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041127C (en) * 1986-10-03 1998-12-09 微动公司 Density insensitive coriolis mass flow rate meter
CN1047844C (en) * 1993-09-11 1999-12-29 安德雷斯和霍瑟弗罗泰克股份公司 Coriolis mass flow sensor with helical measurement tube
US6092409A (en) * 1998-01-29 2000-07-25 Micro Motion, Inc. System for validating calibration of a coriolis flowmeter

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