CN100580391C - Weighting type calibration method of electromagnetic flowmeter - Google Patents
Weighting type calibration method of electromagnetic flowmeter Download PDFInfo
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- CN100580391C CN100580391C CN200810121481A CN200810121481A CN100580391C CN 100580391 C CN100580391 C CN 100580391C CN 200810121481 A CN200810121481 A CN 200810121481A CN 200810121481 A CN200810121481 A CN 200810121481A CN 100580391 C CN100580391 C CN 100580391C
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Abstract
The invention provides a weighting typed calibration method for the portable electromagnetic flow meter. The inner conducting medium weight of the whole pipe is measured by an electronic scale. The electrode of the electromagnetic flow meter is added with a rectangular wave current synchronous with the exciting current of the electromagnetic flow meter by using a stimulating module. An alternative current field which is synchronous with the working magnetic field of the electromagnetic flow meter is formed inside the pipe. The conducting medium in the whole pipe can weight a force F with the upward and the downward directions are changed alternatively. The medium weight measured by the high precision electronic scale is reduced or increased by F divided by g. At the same time, the value of the exciting current I flowed through the electrode can be measured by ammeter. Finally, the once sensor conversion coefficient of the electromagnetic flow meter can be calculated by using the formula that S equals to F divided by I, and furthermore, the dry calibration of the electromagnetic flow meter can be completed. The method can avoid the defects of large device and high cost in prior real flow calibration method, and the defects that the dry calibration method needs to measure the working magnetic field and the mathematical calculation process is complicate. The method is a simple calibration method with low cost and is simple to be realized.
Description
Technical field
The present invention relates to be applied to the scaling method of electromagnetic flowmeter, relate in particular to a kind of Weighting type calibration method of electromagnetic flowmeter.
Background technology
At present, the scaling method of electromagnetic flowmeter mainly is divided into real two kinds of the method for deciding and the dried calibration methods of failing to be sold at auction.
The method of deciding of failing to be sold at auction in fact flows through electromagnetic flowmeter realization demarcation with the measuring media of actual flow, and its principle is comparatively simple, but device is complicated, is made of high-power pumping plant, pipeline and large-scale liquid storage tank etc.This causes real failing to be sold at auction to decide device especially the reality of heavy caliber electromagnetic flowmeter is failed to be sold at auction that to decide device extremely huge and involve great expense, and calibration cost is also very high.
Dried calibration method need not the demarcation that real fluid just can be finished electromagnetic flowmeter.Its principle is: know velocity flow profile function v, weighting function W, magnetic flux density B and pipeline section space τ, by mathematical model U=∫
τ(the d τ of W * B) calculates the certain flow rate branch and plants output voltage between electrode of electromagnetic flowmeter v, further obtains electromagnetic flowmeter primary transducer conversion coefficient.Therefore, dried demarcation is failed to be sold at auction more in fact and is had the low huge advantage of cost surely.Yet weighting function W is not so easy with knowing of magnetic flux density B in do demarcating, and needs by complexity, loaded down with trivial details mathematical computations, and especially magnetic flux density B's knows the measurement that also need be aided with normal direction magnetic flux distribution on the pipeline section border.This causes dried calibration method too complicated for common electrical magnetic flowmeter producer, and owing to need normal direction magnetic flux distribution on the measuring tube segment boundary, efficient is lower.
Therefore, if can invent a kind of easy, easy realization, Electromagnetic Flow meter calibration method cheaply, will be very meaningful.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic flowmeter Weighting type calibration method of easy and easy realization.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Weighting type calibration method of electromagnetic flowmeter, the electromagnetic flowmeter pipeline section is erect and unsettled placement, with the centre be the flange of film with bottom end seal after, in pipeline section, fill conducting medium, below film, place electronic scales and hold up whole section conducting medium, measure whole section conducting medium quality with this, utilize stimulating module on electrode of electromagnetic flowmeter, to add a square wave current signal synchronous with the electromagnetic flowmeter exciting current, then in pipeline section, can form an exchange current field synchronous with electromagnetic flowmeter work magnetic field, the motion in work magnetic field of each conducting particles all will be subjected to long-range navigation magnetic force in the current field, therefore whole section conducting medium will be subjected on the direction, the power F of following alternation, the mass of medium that causes electronic scales to record reduces or increases F/g, measure the size of the exciting current I that flows through electrode simultaneously by galvanometer, then finally calculate electromagnetic flowmeter primary transducer conversion coefficient, thereby finish the demarcation of electromagnetic flowmeter by relational expression S=F/I.
Describedly calculate electromagnetic flowmeter primary transducer conversion coefficient by relational expression S=F/I, Ji Li is: according to the electromagnetic flowmeter mathematical model, when the measurement flow field was the desirable flow field of development fully in the pipeline section, there were relational expression S=∫ in electromagnetic flowmeter primary transducer conversion coefficient S and weighting function W, magnetic flux density B, pipeline section space τ
τW * Bd τ, if in the electromagnetic flowmeter pipeline section, fill static conducting medium, and on electrode, add exciting current signal I, to form a current field in the pipeline section, each conducting particles moves in electromagnetic flowmeter work magnetic field and all will be subjected to long-range navigation magnetic force in this current field, and there is relational expression F=∫ in suffered power F and current density j, magnetic flux density B, the pipeline section space τ of conducting medium in the whole pipeline section space
τJ * Bd τ, weighting function W and current density j have the same distribution characteristic in above-mentioned two relational expressions, and have following relational expression W=j/I, based on above principle, measure F and I, and then calculate electromagnetic flowmeter primary transducer conversion coefficient by relational expression S=F/I.
Describedly on electrode of electromagnetic flowmeter, add a square wave current signal synchronous with the electromagnetic flowmeter exciting current, so that exchange current field that forms in pipeline section and electromagnetic flowmeter work magnetic field are synchronous, and make that the power F that produces also is regular and synchronous square wave, adopt the synchronous square wave current signal of a positive and negative upset but not dc signal, purpose is to prevent that the electrode polarization phenomenon from impacting measurement.
The described measurement that utilizes electronic scales realizable force F, that is: be the electromagnetic flowmeter pipeline section bottom sealing that the flange of film will be equipped with conducting medium with the centre, below film, place the high-precision electronic scale and hold up whole section conducting medium, measure whole section conducting medium quality with this, when current field and work magnetic field interaction, electronic scales can record the undulating quantity Δ M of mass of medium, and Mg obtains power F by relational expression F=Δ.
The present invention compares the beneficial effect that has with background technology:
Avoided real the failing to be sold at auction of traditional electrical magnetic flowmeter to decide the shortcoming that square law device is huge, cost is high, and dried calibration method needs the shortcoming of surveying work magnetic field, mathematical computations process complexity, only need on electrode of electromagnetic flowmeter, to add a square wave current signal synchronous with the electromagnetic flowmeter exciting current, measure the variation of conducting medium quality in the whole pipeline section by the high-precision electronic scale, and by current signal on the galvanometer potential electrode, just can further obtain electromagnetic flowmeter primary transducer conversion coefficient, be a kind of easy, easily realize and Weighting type calibration method cheaply.
Description of drawings
Fig. 1 is an electromagnetic flowmeter Weighting type calibration method synoptic diagram among the present invention.
Fig. 2 is signal and a sequential synoptic diagram among the present invention.
Among the figure: 1, electromagnetic flowmeter pipeline section, 2, electrode of electromagnetic flowmeter, 3, O-ring seal, 4, electrode of electromagnetic flowmeter, 5, flange, 6, film, 7, high-precision electronic scale, 8, galvanometer, 9, stimulating module, 10, electromagnetic flowmeter secondary instrument, 11, computing machine, S1, exciting current signal wire, S2, exciting current signal wire, S3, exciting current signal wire, S4, exciting current signal wire, S5, exciting current signal wire, C1, galvanometer data line, C2, electronic scales data line.
Embodiment
According to the electromagnetic flowmeter theory, output voltage can be explained with following formula between electrode:
U＝∫
τv·(W×B)dτ (1)
In the formula: B---each point magnetic flux density in the electromagnetic flowmeter pipeline section
Each point velocity of medium in v---the electromagnetic flowmeter pipeline section
Space weighting function in W---the electromagnetic flowmeter pipeline section
τ---integration space, i.e. whole measurement space in the electromagnetic flowmeter pipeline section
The purpose that the electromagnetic flowmeter primary transducer is demarcated is to obtain its conversion coefficient S, that is: the size of institute's output voltage between unit flow velocity bottom electrode.When measurement environment reached the electromagnetic flowmeter installation requirement fully, the meter spool piece flow field can be thought the desirable flow field developed fully, and its flow velocity equates everywhere.At this moment, electromagnetic flowmeter primary transducer conversion coefficient S can explain with following formula:
S＝∫
τW×Bdτ (2)
In addition, in the electromagnetic flowmeter pipeline section, fill static conducting medium, and when on electrode, adding exciting current signal I, will form a current field in the pipeline section, each conducting particles moves in electromagnetic flowmeter work magnetic field and all will be subjected to long-range navigation magnetic force in this current field.At this moment, there is following relational expression in suffered power F and current density j, magnetic flux density B, the pipeline section space τ of conducting medium in the whole pipeline section space:
F＝∫
τj×Bdτ (3)
In formula (2), (3), weighting function W and current density j have the same distribution characteristic, and have following relational expression:
W＝j/I (4)
Composite type (2), (3) and (4) can draw:
S＝F/I (5)
Therefore, measure F and I, but just through type (5) calculates electromagnetic flowmeter primary transducer conversion coefficient, thereby finish the demarcation of electromagnetic flowmeter.
Specific implementation method as shown in Figure 1, electromagnetic flowmeter pipeline section 1 is erect and unsettled placement, with the centre is that the flange 5 of film 6 and O-ring seal 3 are with bottom end seal, in electromagnetic flowmeter pipeline section 1, fill conducting medium, below film 6, place high-precision electronic scale 7 and hold up whole section conducting medium, measure whole section conducting medium quality with this.Stimulating module 9 links to each other with electrode of electromagnetic flowmeter 2,4 through exciting current signal wire S1, S2, S3 and galvanometer 8, forms current return together with conducting medium, and stimulating module 9 inside are AC signal generator.Draw exciting current signal wire S4, S5 from electromagnetic flowmeter secondary instrument 10, for stimulating module 9 provides the synchronous sequence reference signal, make stimulating module 9 in current return, form a square wave current signal synchronous, thereby in electromagnetic flowmeter pipeline section 1, form an exchange current field synchronous with electromagnetic flowmeter work magnetic field with the electromagnetic flowmeter exciting current.Because the motion in work magnetic field of each conducting particles all will be subjected to long-range navigation magnetic force in the current field, therefore whole section conducting medium will be subjected to the power F of a upper and lower alternation of direction.
As shown in Figure 2, power F and exciting current and exciting current are synchronous, cause the measurement result of high-precision electronic scale 7 alternately to reduce or increase Δ M by exciting current and exciting current same period on the basis of initial quality M.Obviously, there is relational expression:
F＝ΔM·g (6)
Why adding the square wave current signal of a positive and negative upset but not dc signal on electrode of electromagnetic flowmeter, is in order to prevent that polarization phenomena from impacting measurement, and the power F that produces like this is regular and synchronous square wave, is convenient to measure.During measurement, as shown in Figure 1, computing machine 11 is controlled high-precision electronic 7 sampling times of scale, number of times by electronic scales data line C2, high-precision electronic scale 7 sends measurement result to computing machine 11 by electronic scales data line C2, and computing machine 11 further calculates power F according to formula (6).Simultaneously, computing machine 11 is by galvanometer data line C1, and Control current meter 8 flows through the size of the exciting current I of electrode of electromagnetic flowmeter with identical sampling time, number of times measurement, and obtains measurement result.At last, computing machine 11 utilizes resulting F and I value, calculates electromagnetic flowmeter primary transducer conversion coefficient according to formula (5), thereby finishes the demarcation of electromagnetic flowmeter primary transducer.
Finish the demarcation of electromagnetic flowmeter complete machine, also need realize the demarcation of electromagnetic flowmeter secondary instrument.At present, the simulator method is generally adopted in the demarcation of electromagnetic flowmeter secondary instrument, promptly with the output of simulator output simulation primary transducer, realizes the demarcation of secondary converter, and the simulator method is now very ripe, so the present invention continues to use the method.
Claims (4)
1, a kind of Weighting type calibration method of electromagnetic flowmeter, it is characterized in that: the electromagnetic flowmeter pipeline section is erect and unsettled placement, with the centre be the flange of film with bottom end seal after, in pipeline section, fill conducting medium, below film, place electronic scales and hold up whole section conducting medium, measure whole section conducting medium quality with this, utilize stimulating module on electrode of electromagnetic flowmeter, to add a square wave current signal synchronous with the electromagnetic flowmeter exciting current, then in pipeline section, can form an exchange current field synchronous with electromagnetic flowmeter work magnetic field, the motion in work magnetic field of each conducting particles all will be subjected to long-range navigation magnetic force in the current field, therefore whole section conducting medium will be subjected on the direction, the power F of following alternation, the mass of medium that causes electronic scales to record reduces or increases F/g, measure the size of the exciting current I that flows through electrode simultaneously by galvanometer, then finally calculate electromagnetic flowmeter primary transducer conversion coefficient, thereby finish the demarcation of electromagnetic flowmeter by relational expression S=F/I.
2, the Weighting type calibration method of a kind of electromagnetic flowmeter according to claim 1, it is characterized in that: describedly calculate electromagnetic flowmeter primary transducer conversion coefficient by relational expression S=F/I, Ji Li is: according to the electromagnetic flowmeter mathematical model, when the measurement flow field was the desirable flow field of development fully in the pipeline section, there were relational expression S=∫ in electromagnetic flowmeter primary transducer conversion coefficient S and weighting function W, magnetic flux density B, pipeline section space τ
τW * Bd τ, if in the electromagnetic flowmeter pipeline section, fill static conducting medium, and on electrode, add exciting current signal I, to form a current field in the pipeline section, each conducting particles moves in electromagnetic flowmeter work magnetic field and all will be subjected to long-range navigation magnetic force in this current field, and there is relational expression F=∫ in suffered power F and current density j, magnetic flux density B, the pipeline section space τ of conducting medium in the whole pipeline section space
τJ * Bd τ, weighting function W and current density j have the same distribution characteristic in above-mentioned two relational expressions, and have following relational expression W=j/I, based on above principle, measure F and I, and then calculate electromagnetic flowmeter primary transducer conversion coefficient by relational expression S=F/I.
3, the Weighting type calibration method of a kind of electromagnetic flowmeter according to claim 1, it is characterized in that: describedly on electrode of electromagnetic flowmeter, add a square wave current signal synchronous with the electromagnetic flowmeter exciting current, so that exchange current field that forms in pipeline section and electromagnetic flowmeter work magnetic field are synchronous, and make that the power F that produces also is regular and synchronous square wave, adopt the synchronous square wave current signal of a positive and negative upset but not dc signal, purpose is to prevent that the electrode polarization phenomenon from impacting measurement.
4, the Weighting type calibration method of a kind of electromagnetic flowmeter according to claim 1, it is characterized in that: the described measurement that utilizes electronic scales realizable force F, that is: be the electromagnetic flowmeter pipeline section bottom sealing that the flange of film will be equipped with conducting medium with the centre, below film, place the high-precision electronic scale and hold up whole section conducting medium, measure whole section conducting medium quality with this, when current field and work magnetic field interaction, electronic scales can record the undulating quantity Δ M of mass of medium, and Mg obtains power F by relational expression F=Δ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200810121481A CN100580391C (en) | 2008-10-07 | 2008-10-07 | Weighting type calibration method of electromagnetic flowmeter |
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| CN200810121481A CN100580391C (en) | 2008-10-07 | 2008-10-07 | Weighting type calibration method of electromagnetic flowmeter |
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| CN100580391C true CN100580391C (en) | 2010-01-13 |
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| CN200810121481A Expired - Fee Related CN100580391C (en) | 2008-10-07 | 2008-10-07 | Weighting type calibration method of electromagnetic flowmeter |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750136B (en) * | 2009-12-31 | 2012-07-25 | 北京航空航天大学 | Dry calibration method of electromagnetic flow meter based on intraductal magnetic field simulation numerical calculation |
| CN104538148B (en) * | 2014-12-02 | 2017-02-22 | 黄元雄 | Miniature electron-position collision system and method for magnetizing electromagnetic product by using same |
| CN112945358A (en) * | 2021-02-22 | 2021-06-11 | 广东韶钢松山股份有限公司 | Automatic calibrating method and system for glass measuring tool |
| TWI807944B (en) * | 2022-07-29 | 2023-07-01 | 許琦 | The Structure of Load Meter and the Measurement Method of Load Eccentricity |
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Non-Patent Citations (4)
| Title |
|---|
| Dry Calibration Procedure of Electromagnetic Flowmeter forOpen Channels. Andrzej Michalski.IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT,Vol.49 No.2. 2000 |
| Dry Calibration Procedure of Electromagnetic Flowmeter forOpen Channels. Andrzej Michalski.IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT,Vol.49 No.2. 2000 * |
| 电磁流量计的理论模型及其在干标定上的应用. 张小章.南京航空学院学报，第22卷第1期. 1990 |
| 电磁流量计的理论模型及其在干标定上的应用. 张小章.南京航空学院学报，第22卷第1期. 1990 * |
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