CN103090933A - Method used for diagnosing according to deviation of flow meter parameters - Google Patents
Method used for diagnosing according to deviation of flow meter parameters Download PDFInfo
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- CN103090933A CN103090933A CN2013100093815A CN201310009381A CN103090933A CN 103090933 A CN103090933 A CN 103090933A CN 2013100093815 A CN2013100093815 A CN 2013100093815A CN 201310009381 A CN201310009381 A CN 201310009381A CN 103090933 A CN103090933 A CN 103090933A
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Abstract
The invention provides a method used for detecting flow meter parameter deviation of a flow meter. The method is applicable to measuring fluid flow. The method comprises the following steps: measuring at least one part of differential pressure of a flow meter; comparing a measured differential pressure with an expected differential pressure, wherein the expected differential pressure is based on measuring flow; and detecting deviation of flow meter parameters if the difference between the measured differential pressure and the expected differential pressure exceeds the threshold limit.
Description
Technical field
The present invention relates to flowmeter, and relate more specifically to the method diagnosed be used to the deviation of utilizing flow meter parameter.
Background technology
Mass rate and other information of measuring be used to the material that flows through the flowmeter inner conduit with the mass flowmeter of Coriolis effect are known.All authorize in the people's such as J.E.Smith United States Patent (USP) 4109524, United States Patent (USP) 4491025 and Re.31450 and disclose exemplary coriolis flowmeter.These flowmeters have one or more conduit of straight line or warp architecture.Each guide-tube structure in coriolis mass flowmeters has a cover eigentone, can be simple bending, torsion or coupling type.Each conduit can be driven under a kind of pattern in these natural modes with resonance oscillations.Entrance side at flowmeter is conducted through one or more conduit from the material that the pipeline that is connected flows in flowmeter, and then the outlet side by flowmeter leaves flowmeter.The eigentone of the Material Filling system of vibration is partly determined by the gross mass of the material that flows in conduit and conduit.
When not having flow to pass through flowmeter, all can have same phase or the initial little stationary phase deviation that can be corrected is vibrated due to the driver acting force that applies along all positions of conduit.When material began to flow through flowmeter, the Coriolis acting force caused having different phase places along each position of conduit.For example, in the phase place of flowmeter inlet end, driver is lagged behind, make driver leading in the phase place of outlet.One or more supravasal sensitive element sensor generates the sinusoidal signal of expression one or more rod action.Signal output from the sensitive element sensor is processed to determine the phase differential between the sensitive element sensor.Phase differential between two or more sensitive element sensors is proportional with the mass rate of the material that flows through one or more conduit.
Coriolis mass flowmeters is obtaining great success in commercial Application widely.But coriolis flowmeter is the same with a lot of other flowmeters, all can run into the problem of the left sediment accumulation of process fluid.This accumulation is called as " coat " usually in this area.According to the characteristic of process fluid, the fluid coat may also may not can have influence on performance and the precision of flowmeter.Also can not cause the measuring error of flow although coat neither can affect the stability of flowmeter usually, it can affect other aspects of flowmeter characteristic.For example, coat may have the density different from process fluid.This may have influence on the density readings that obtains conversely from flowmeter.For some process fluid, coat may be accumulated to certain thickness in flowmeter and collapse subsequently becomes fractionlet.These fractionlets may affect other processing element that are connected to flowmeter.Under extreme case, get clogged and need to thoroughly quit work or need in some cases to change fully flowmeter to such an extent as to coat may be accumulated to abundant flowmeter.
The factors such as temperature change of coat, obstruction, unsettled process stream components, process fluid may cause other problems.For example, in paint industry, same flowmeter can be used to multiple color of paint.Therefore, even coat can not cause the meter readings error, coat also can cause negative effect to final products.
Due to the problems referred to above and the other problems that caused by coat, therefore wish to diagnose when having the flowmeter coat to exist.The diagnostic method that detects the flowmeter coat in prior art has a lot of problems.At first, a lot of method of the prior art be confined to the flowtube live part namely the coat in oscillating component detect.Other restrictions of the prior art come from the situation that coat density is substantially similar to process fluid.In the case, the density-based coat detects and can't carry out.Therefore, there is demand for the coat detection method that has overcome above-mentioned restriction in this area.And, can apply in the application of flowmeter at the known procedure fluid, wish when flowmeter can be detected during the cleaning flowmeter has been completely removed coat.
Summary of the invention
According to a kind of application of the present invention, a kind of method of the deviation for detection of flow meter parameter comprises the following steps:
Pressure reduction at least a portion of measuring flow meter;
The pressure reduction of measuring is compared with the expection pressure reduction based on measuring flow; And
If the difference between the pressure reduction of measuring and expection pressure reduction surpasses threshold restriction, the deviation of flow meter parameter detected.
Preferably, described method further comprises the step of measuring the pressure reduction on whole flowmeter.
Preferably, described expection pressure reduction is based on known fixedly fluid viscosity.
Preferably, described expection pressure reduction obtains by preprepared pressure reduction-flow curve.
Preferably, described method further comprises and will expect that pressure reduction is stored in the step in the metering electronic equipment.
Preferably, described threshold restriction comprises predetermined value.
Preferably, described flowmeter comprises coriolis flowmeter.
Preferably, the coat in the deviation indicating flowmeter of described flow meter parameter.
According to another kind of application the according to the present invention, a kind of method of the deviation for detection of flow meter parameter comprises the following steps:
Pressure reduction on the measuring flow meter;
Calculate the expection fluid flow based on described pressure reduction; And
The fluid flow of measuring is compared with the fluid flow of calculating, if the difference between the fluid flow of the fluid flow of measuring and calculating surpasses threshold restriction, the deviation of flow meter parameter detected.
Preferably, the step of calculating expection fluid flow comprises that with the qualitative of flowmeter be the step of orifice flowmeter.
Preferably, described method further comprises the step of determining the flowmeter coefficient of flow.
Preferably, described method further comprises and will expect that fluid flow is stored in the step in the metering electronic equipment.
Preferably, described threshold restriction comprises predetermined value.
Preferably, described flowmeter comprises coriolis flowmeter.
Preferably, the coat in the deviation indicating flowmeter of described flow meter parameter.
According to another kind of application the according to the present invention, a kind of method of the deviation for detection of flow meter parameter comprises the following steps:
Pressure reduction at least a portion of measuring flow meter;
Pressure reduction based on the flow of measuring and measurement calculates friction factor; And
The friction factor that calculates is compared with the expection friction factor based on measuring flow, if the difference between the friction factor that calculates and expection friction factor surpasses threshold restriction, the deviation of flow meter parameter detected.
Preferably, the step of calculating friction factor comprises the use formula:
Preferably, described expection friction factor obtains according to previous measured value.
Preferably, described pressure reduction is measured on whole flowmeter.
Preferably, described expection friction factor calculates based on the Reynolds number that is used for measuring flow.
Preferably, described method further comprises and will expect that friction factor is stored in the step in the metering electronic equipment.
Preferably, described flowmeter comprises coriolis flowmeter.
Preferably, the coat in the deviation indicating flowmeter of described flow meter parameter.
According to another kind of application the according to the present invention, a kind of method of the deviation for detection of flow meter parameter comprises the following steps:
In a plurality of position measurement flowtube temperature; And
Based on the temperature computation thermograde of measuring, if the thermograde of calculating surpasses the thermograde threshold value, the deviation of flow meter parameter detected.
Preferably, the step of described accounting temperature gradient comprises the thermograde of calculating the outlet from the flowmeter entrance to flowmeter.
Preferably, the step of described accounting temperature gradient comprises the thermograde of calculating from first-class buret to the second buret.
Preferably, described method further comprises if the change of the thermograde of calculating exceeds threshold restriction, the step of coat detected in flowmeter.
Preferably, described thermograde threshold value is predetermined.
Preferably, described flowmeter comprises coriolis flowmeter.
Preferably, the coat in the deviation indicating flowmeter of described flow meter parameter.
Description of drawings
Fig. 1 shows the flowmeter according to the embodiment of the present invention.
Fig. 2 shows the partial cross section figure according to the flowmeter of the embodiment of the present invention.
Fig. 3 shows the sectional view of flowtube, has at the inner coat that forms of flowtube.
Fig. 4 shows the calcspar according to the flowmeter of the embodiment of the present invention.
Embodiment
Fig. 1-4 and the following description content introduction concrete example be used for instruction those skilled in the art and how realize and use optimal mode of the present invention.In order to instruct principle of the present invention, some conventional contents are simplified or omit.Those skilled in the art can understand the various distortion that to fall in protection domain of the present invention from these examples.The feature that those skilled in the art should understand that following introduction can be made up to form various deformation of the present invention in various manners.Therefore, the present invention is not limited to the concrete example of following introduction, and can only be determined by claim and the equivalent form of value thereof.
Fig. 1 shows the flowmeter 100 according to the embodiment of the present invention.According to one embodiment of present invention, flowmeter 100 comprises coriolis flowmeter.But the present invention is not limited to the application that coriolis flowmeter is housed, but should be understood to that the present invention can be used for the flowmeter of other types.Flowmeter 100 comprises sleeve pipe 103 and the manifold 107 of encapsulation flowtube 101,102 bottoms, and flowtube 101,102 is connected internally to flange 104 and is connected to flange 105 at its right-hand member by neck 120 by neck 108 at its left end.Also show outlet 106, left side sensitive element LPO, right side sensitive element RPO and the driver D of flange 105 in Fig. 1.Right side sensitive element RPO has been illustrated the part details and has comprised magnet structure 115 and loop construction 116.The element 114 of manifold sleeve pipe 103 bottoms is for receiving the inner opening that extends to the line (not shown) of driver D and sensitive element LPO and RPO from metering electronic equipment (not shown).Flowmeter 100 is fit to be connected to pipeline etc. by flange 104 and 105 in use.
Fig. 2 shows the cut-open view of flowmeter 100.This view has removed the front portion of manifold sleeve pipe 103 so that the internal part of manifold sleeve pipe can be shown.But parts not shown in Figure 1 shown in Figure 2 comprise the flowtube part 214,215,216 and 217 of outer end strut 201 and 204, inner strut 202 and 203, right-hand member flowtube escape hole 205 and 212, flowtube 101 and 102, bending.In use, flowtube 101 and 102 is around its bending axis W and W vibration. Outer end strut 201 and 204 and inner strut 202 and 203 help to determine the position of bending axis W and W.
According to the embodiment shown in Fig. 2, flowmeter 100 comprises pressure transducer 230.According to embodiments of the invention, pressure transducer 230 comprises differential pressure pickup.Pressure transducer 230 is connected to flowmeter 100 to obtain pressure reading by pressure tapping hole 231 and 232. Pipe tap 231 and 232 authorized pressure sensors 230 are monitored the material pressure drop on flowmeter 100 continuously.Although it should be noted that pipe tap 231,232 can be connected to flowmeter 100 in any desired location, according to the embodiment shown in Fig. 2, pipe tap 231,232 is connected respectively flange 104,105 places.Advantageously, can to obtain for whole flowmeter 100 be not only the differential pressure measurement value of flowmeter 100 live parts to pressure transducer 230.In other embodiment, for example following shown in Figure 4, pressure tapping hole 231,232 can be arranged in the pipeline of connection traffic meter.Below can further introduce differential pressure measurement.
Fig. 2 also shows a plurality of temperature measuring equipments 240.According to the embodiment shown in Fig. 2, temperature measuring equipment comprises the RTD sensor.But should be appreciated that temperature measuring equipment and the present invention that can use other should not be restricted to the RTD sensor yet.Similarly, although show six RTD sensors 240, within the RTD sensor that should be appreciated that any amount all can use and still drops on protection scope of the present invention.
Fig. 3 shows the sectional view of a part of flowtube 101 with coat 310.Although only show a part of flowtube 101, should be appreciated that coat 310 also can form in the inside that flowtube 102 and flowmeter 100 are exposed to the miscellaneous part of process fluid.Along with flow of process fluid overcurrent buret 101, the sediment in process fluid may stay.As time goes on, these sediments have just formed coat 310.Coat 310 may cover whole internal diameters of flowtube 101 as shown in the figure, and perhaps coat 310 can form in some zone of flowtube 101 alternatively, and other zones do not have coat 310.And, although coat 310 may be unlike so thick shown in Fig. 3 in concrete the application, to such an extent as in some process coat 310 enough thick flowmeters 100 that seriously blocks that can become.Even coat 310 does not also have thick in being enough to block flowmeter 100, it also can reduce the cross-sectional area that the confession process fluid flows through.For example, flowtube 101 internal diameter that can have is D
1But when having coat 310 to exist, the reality that process fluid can therefrom flow through can allow diameter just to be reduced to D
2
Because coat 310 may have negative effect to the performance of flowmeter 100, so the invention provides for the interior optional method that has coat 310 of definite flowmeter 100.And although method of the prior art is limited to and can only namely detects coat 310 at the oscillating component of flowtube 101,102 at live part, the present invention can comprise that all parts of manifold 104,105 detect coat 310 at flowmeter 100.Yet should be appreciated that the present invention is not limited to the detection coat, and the present invention also provides the optional method for detection of the deviation of flow meter parameter.Flow meter parameter can be any measured value that is obtained by flowmeter.In certain embodiments, the deviation of flow meter parameter is caused by coat 310.But other factors also can cause the deviation of flow measurement value, such as bubble that forms in the obstruction of flowmeter, unsettled temperature, unsettled process fluid potpourri, flowmeter etc.Therefore, according to embodiments of the invention, the method that below provides detects the deviation of flow meter parameter, and this just can provide further analysis required diagnosis.
The deviation of flow meter parameter can be according to a kind of detection the in the following stated method.According to embodiments of the invention, directly detect the deviation of flow meter parameter according to the differential pressure measurement value that is obtained by pressure transducer 230.In factory or when there is no coat 310 in known mass flow meter 100 at the scene alternatively, for example can be ready to pressure reduction on a part of flowmeter 100 and the curve of mass rate and be used for known fixedly fluid viscosity.Can be identified for the expection pressure reduction of target flow according to this curve.Can utilize subsequently pressure transducer 230 monitor continuously actual pressure differential and it is compared with the expection pressure reduction that is used for measuring flow.If actual pressure differential is in the threshold restriction of expection pressure reduction, measure so electronic equipment 20 and can send the signal that parameter error do not detected, perhaps send alternatively and the signal of little deviation detected in flow meter parameter.On the other hand, if the pressure reduction of measuring drops on beyond threshold restriction, measuring so electronic equipment 20 can be used for further analyzing by this measured value of mark.According to one embodiment of present invention, threshold restriction comprises predetermined value.According to another embodiment of the invention, threshold restriction is set by user or operating personnel.
Although this method provides satisfied result, use the method for this direct comparison that a lot of restrictions are still arranged.At first, the user must know the viscosity of process fluid.In addition, viscosity must keep constant substantially.This is because the viscosity that the expection pressure reduction that the previous measured value of basis obtains and actual pressure differential all depend on process fluid.Due to this restriction, the change of pressure reduction may mean other conditions that are different from coat, thereby gives the coat that makes mistake indication.
That flowmeter 100 qualitative is orifice flowmeter for detection of the another kind of method of the deviation of flow meter parameter.Orifice flowmeter is known and is used to measure fluid flow according to pressure reduction.Orifice flowmeter has certain advantage with comparing according to other flowmeters of differential pressure measurement fluid flow, and reason is that the space that they take is much smaller.Orifice flowmeter carries out work by the plate with hole is set in pipe, its mesopore is less than the diameter of pipe.Cross-sectional area this reduces to make take the pressure potential difference as cost the Fluid Flow in A potential difference that gathers way.This pressure reduction can be measured before plate He after plate by pressure tapping hole.Utilize the pressure reduction of measuring, can come Fluid Computation speed according to for example following formula:
Wherein:
V
0=speed by the hole
The ratio of β=aperture and caliber
Pressure reduction on Δ P=hole
ρ=fluid density
C
0=orifice flow coefficient of discharge
Should be appreciated that known other formula that utilize the aperture to come the Fluid Computation flow that have, formula (1) is only an example, and it should in no way limit protection scope of the present invention.Usually, except orifice flow coefficient of discharge C
OIn addition, all unknown quantitys can be measured or known, orifice flow coefficient of discharge C
OUsually want experimentally determine and can change along with the difference of flowmeter.It depends on β and Reynolds number usually, and Reynolds number is dimensionless number and is defined as follows:
Wherein:
The D=diameter
μ=fluid viscosity
ρ=fluid density
V=moving fluid viscosity
For multiple orifice flowmeter, orifice flow coefficient of discharge C
0Almost keep constant and with greater than approximately 30000 Reynolds number is irrelevant.As orifice flowmeter, flowmeter 100 experiences the pressure drop that can survey and can be regarded as the orifice flowmeter shown in Fig. 4.
Fig. 4 shows the flowmeter 100 that is positioned at pipeline 410 and is connected to metering electronic equipment 20.In Fig. 4, the inner structure of flowmeter 100 is not shown, but flowmeter 100 is depicted as simple calcspar.During experiment test, flowmeter 100 can be named as orifice flowmeter.In other words, pressure transducer 430 can utilize respectively pressure tapping hole 431,432 to come the entrance 410 of measuring flow meter 100 and export pressure reduction between 411.Due to the variable in formula (1) or known, perhaps can obtain by measuring easily, and flowmeter 100 determined flow, therefore can experimentally determine the coefficient of flow of flowmeter.The coefficient of flow of flowmeter is similar to the orifice flow coefficient of discharge.In case the coefficient of flow of flowmeter is known, can be according to the pressure reduction on flowmeter 100 to calculate flow with determine the identical principle of flow with orifice flowmeter as the basis.
In normal work period, can with the flow measured by flowmeter 100 with by using formula (1) or for comparing as the desired flow of the similar formula calculating acquisition of basic calculation flow with orifice flowmeter.If desired flow drops on beyond the threshold value difference of the flow that is obtained by flowmeter 100, measure so electronic equipment 20 and can send flow meter parameter signal devious.This deviation may be that the coat 310 by flowmeter 100 interior existence causes.But this variation may be also to be caused by certain reason that is different from coat 310.On the other hand, if by the qualitative desired flow that obtains for orifice flowmeter of flowmeter is dropped in the threshold value difference of the measuring flow that is obtained by flowmeter 100, measure so electronic equipment 20 and can send flow meter parameter and only have very little deviation or do not have signal devious.Should be appreciated that threshold value difference can be predetermined, perhaps also can be determined based on concrete condition by operating personnel.
Having the another kind of method of deviation for detection of flow meter parameter is to utilize for example Fanning friction factor f of friction factor, and this method is compared with aforesaid method provides higher precision and applicability widely.Other friction factor is also commonly known in the art, for example is approximately the Darcy Wei ssbach friction factor of 4f.The friction factor that should be appreciated that concrete use is unimportant for the present invention, because any applicable formula can be adjusted according to friction factor used.
Can be by quantizing with friction factor f and adjusting is commonly known in the art through the pressure drop of pipeline.At first, importantly be appreciated that the how qualitative process fluid that flows through circular pipeline.For this embodiment, flowmeter 100 can be named as the circular pipeline with known internal diameter and length.When flowing through the fluid of pipeline, an important numerical value is the reynolds number Re that uses in above-mentioned formula (2) qualitative.It should be noted that caliber D can be determined easily and be all known usually in factory.The a lot of flowmeters that comprise coriolis flowmeter can both be measured characteristic of fluid for example fluid density and mass rate.Just can calculate average fluid velocity according to these two amounts.Also can determine fluid viscosity according to numerical value known, that calculate or measure.
The friction factor of system is defined as wall shear stress and density and speed potential difference product
Ratio.For the flow system of incompressible fluid, it is often effectively coming qualitative friction factor f with reynolds number Re.Concrete formula changes according to the feature of the pipeline that fluid and Fluid Flow in A pass through.Should be appreciated that following formula is only example, and also have known other similar formula in prior art.Therefore, the formula of below enumerating and unrestricted protection scope of the present invention.For the laminar flow that flows through smooth pipeline, friction factor f can be described to:
As a comparison, for the turbulent flow that flows through smooth pipeline, friction factor f can be described to:
Formula (4) can be 10
4＜Re＜10
6In time, uses and has a rational precision.Also known other formula that friction factor is associated with Reynolds number that are useful on, for example:
f＝.046Re
-2 (5)
Formula (5) can be applicable to 50000＜Re＜10 usually
6, and formula (6) can be applicable to 3000＜Re＜3 * 10 usually
6According to any one in formula (1) and formula (3)-(6), can determine the friction factor of system, wherein only having viscosity is unknown quantity.According to flow, the change of viscosity may be also not obvious.Alternatively, the user can input nominal viscosity.
It is also known in the art that friction factor f can be described below with the pressure drop Δ P by system:
Wherein:
Δ P=pressure drop
Pipe range between the L=pressure tapping hole
The f=friction factor
ρ=fluid density
The D=caliber
Pressure drop can obtain by pressure transducer 230; The length of flowmeter 100 between pressure tapping hole 231,232 can be measured easily; Caliber also can be measured easily; Fluid density can be obtained by flowmeter 100, and average velocity can obtain according to mass rate and by the density of flowmeter survey.Therefore, all variablees on formula (7) right side all can be known.
According to embodiments of the invention, by the friction factor f that will calculate based on pressure reduction
cWith expection friction factor f
eCompare and to diagnose according to the deviation that exists in flow meter parameter.Can obtain to expect friction factor f with multiple different mode
eAccording to one embodiment of present invention, can or knownly at the scene alternatively only have a small amount of or determine expection friction factor f when there is no coat in factory
eCan obtain to expect friction factor f according to various flow measurements
eAnd the relation curve of friction factor and flow can be ready to thus.Expection friction factor f
eCan be ready in advance and be stored in metering electronic equipment 20.According to another embodiment of the invention, can be according to the correlation calculations expection friction factor f of the Reynolds number that obtains with normal work period
e
In normal work period, according to embodiments of the invention, pressure transducer 230 can obtain the differential pressure measurement value of flowmeter 100.In addition, flowmeter 100 can obtain flow measurements.According to flow measurements and differential pressure measurement value, the friction factor f of calculating
cCan be calculated by formula (7).Can be with the friction factor f of this calculating
cWith expection friction factor f
eCompare.Difference between two friction factor has just been indicated the deviation of flow meter parameter.According to an embodiment, this deviation can be caused by the coat 300 in flowmeter 100.But in other embodiment, this deviation also can be caused by other situations such as bubble in obstruction, unsettled process fluid potpourri, process fluid etc.If the friction factor f that calculates
cDrop on expection friction factor f
eThreshold restriction in, metering electronic equipment 20 can determine not have in flow meter parameter deviation or small deviation only.On the other hand, if the friction factor f that calculates
cDrop on expection friction factor f
eThreshold restriction beyond, may there be the warning of deviation in can transmitted traffic meter parameter in metering electronic equipment 20.According to one embodiment of present invention, threshold restriction can pre-determine according to concrete flowmeter or flow characteristics.According to another embodiment of the invention, threshold restriction can be by user or operating personnel's in-situ determination.
Except the Accurate Prediction that coat 230 is provided, the method can also be determined the deviation of flow meter parameter in addition when lacking accurately known fluid viscosity.According to the flow of fluid, the minor alteration of viscosity may not can cause the significant change of Reynolds number.Therefore, can input average viscosity and need not further to measure viscosity by the user.
According to another embodiment of the invention, can utilize measured temperature to detect the deviation of flow meter parameter.When flow of process fluid inflow-rate of water turbine meter 100, temperature in and outlet temperature keep approaching toward each other.Similarly, flowtube 101 and flowtube 102 remain essentially in identical temperature.According to embodiments of the invention, flowmeter 100 comprises for example RTD240 of two or more temperature sensors.Although Fig. 2 only shows six RTD, should be appreciated that in other embodiments, flowmeter 100 can comprise greater or less than six RTD sensors 240.RTD sensor 240 can monitoring stream buret 101,102 temperature.Coat 310 for example can hinder fluid flows buret 101,102.Therefore, coat 310 also can cause the entrance of target flow pipe from 101 or 102 to the abnormal change of the thermograde of outlet.In addition, coat 310 can cause from flowtube 101 to flowtube 102 thermograde.Obstruction also can have influence on thermograde, and reason is in fact to only have fluid seldom or does not have fluid to advance by flowmeter 100 at all.
Therefore, according to embodiments of the invention, can detect based on thermograde the deviation of flow meter parameter.More specifically, according to embodiments of the invention, can by follow the tracks of by more than the temperature sensor of for example the change of the thermograde that obtains of RTD sensor 240 determine deviation.According to an embodiment, measure thermograde from the entrance of flowmeter 100 to the outlet of flowmeter 100.According to another embodiment of the invention, measure thermograde from a flowtube 101 of flowmeter 100 to another root flowtube 102 of flowmeter 100.According to embodiments of the invention, if thermograde exceeds the threshold value of thermograde, coat 310 can be detected.According to an embodiment, the thermograde threshold value comprises predetermined value.According to another embodiment, the thermograde threshold value is determined by user or operating personnel.
In certain embodiments, even flowmeter 100 can not comprise thermograde yet when there is no deviation.Therefore, according to embodiments of the invention, can come detection error according to the change of the thermograde that has existed.
Above explanation provides the several different methods for detection of the flow meter parameter deviation of flowmeter 100.According to embodiments of the invention, it may be the diagnosis of indication coat that the deviation of flow meter parameter can be used to carry out.Each method all comprises different advantages, and the concrete grammar that uses can depend on environment of living in or available devices.Deviation when some method allows not have deviation in flow measurements in detected parameters.In addition, can adopt in single flowmeter system in said method more than a kind of or whole.Therefore, metering electronic equipment 20 can detect the deviation of using a kind of method to obtain with the result of using another kind of method to obtain and compare.
Detailed description in above-described embodiment is not the contemplated exhaustive explanation that drops on the whole embodiment in protection domain of the present invention of inventor.In fact, those skilled in the art can recognize that some element in above-described embodiment can differently make up or delete to form further embodiment, and these further embodiment also all drop on protection scope of the present invention and the instruction within.To those skilled in the art, it is evident that above-described embodiment can make up to form the more embodiment that drop within protection scope of the present invention and instruction whole or in part.
Therefore, be used for specific embodiments of the invention and example although introduced for illustrative purpose herein, as those skilled in the art can recognize like that, it is all feasible in protection scope of the present invention that various equivalences are out of shape.The instruction that provides herein can be applied to other flowmeter and be not only for embodiment above introduction and illustrated in the accompanying drawings.Therefore, protection scope of the present invention should be indicated in the appended claims.
Claims (7)
1. method for detection of the deviation of flow meter parameter comprises the following steps:
In a plurality of position measurement flowtube temperature; And
Based on the temperature computation thermograde of measuring, if the thermograde of calculating surpasses the thermograde threshold value, the deviation of flow meter parameter detected.
2. the method for claim 1, the step of wherein said accounting temperature gradient comprise the thermograde of calculating the outlet from the flowmeter entrance to flowmeter.
3. the method for claim 1, the step of wherein said accounting temperature gradient comprise the thermograde of calculating from first-class buret to the second buret.
4. the method for claim 1, further comprise if the change of the thermograde of calculating exceeds threshold restriction, the step of coat detected in flowmeter.
5. the method for claim 1, wherein said thermograde threshold value is predetermined.
6. the method for claim 1, wherein said flowmeter comprises coriolis flowmeter.
7. the existence of coat in the method for claim 1, the deviation indicating flowmeter of wherein said flow meter parameter.
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| CN109477747A (en) * | 2016-07-08 | 2019-03-15 | 恩德斯+豪斯流量技术股份有限公司 | Oscillatory type flow measuring system with temperature-compensating |
| CN111896080A (en) * | 2020-07-31 | 2020-11-06 | 中国重汽集团济南动力有限公司 | Calculation method and device for liquid level measurement deviation diagnosis of urea quality sensor |
| CN111896080B (en) * | 2020-07-31 | 2022-08-12 | 中国重汽集团济南动力有限公司 | Calculation method and device for liquid level measurement deviation diagnosis of urea quality sensor |
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