EP2502033A1 - Agencement de débitmètre à auto-surveillance et procédé de fonctionnement associé - Google Patents

Agencement de débitmètre à auto-surveillance et procédé de fonctionnement associé

Info

Publication number
EP2502033A1
EP2502033A1 EP10762681A EP10762681A EP2502033A1 EP 2502033 A1 EP2502033 A1 EP 2502033A1 EP 10762681 A EP10762681 A EP 10762681A EP 10762681 A EP10762681 A EP 10762681A EP 2502033 A1 EP2502033 A1 EP 2502033A1
Authority
EP
European Patent Office
Prior art keywords
flow
measured
change profile
flow rate
rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10762681A
Other languages
German (de)
English (en)
Inventor
Richard Heyne
Michael Moellgaard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Process Solutions AG
Original Assignee
Endress and Hauser Process Solutions AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Process Solutions AG filed Critical Endress and Hauser Process Solutions AG
Publication of EP2502033A1 publication Critical patent/EP2502033A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/005—Valves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes

Definitions

  • the invention relates to a self-monitoring
  • Flow measuring arrangement with a flowed through by a medium piping system, and at least one at a measuring location in the
  • Pipeline system used flowmeter that measures the flow rate of the medium at its site.
  • Flowmeters are used in a variety of industrial plants, as well as in the water and wastewater industry, where they are used, for example, to measure flow rates and / or measured variables derived therefrom, for process control or for the detection of leaks in
  • control devices such as e.g. Pumps or valves, used to maintain desired flow rates or to control desired flow rates. These are optimally adjusted for the respective system using flow rates measured with the flowmeters.
  • control devices are controlled on the basis of control parameters which are determined for the respective process.
  • EP 0 853 775 B1 and EP 0 845 1 18 B1 describe methods for determining such control parameters, in which a process variable to be measured is replaced by a process variable
  • Stimulator is actively varied according to a ramp function, and based on the meanwhile measured measured values of the process variable, the control parameters are calculated.
  • flow measurement devices are used to detect leaks in piping systems.
  • flow measurements are carried out at at least two different measuring locations within the pipeline system through which the entire amount of medium flows. Based on these flow measurements, the at each of the two
  • US Pat. No. 7,255,012 B2 discloses a flow measuring arrangement with an iris diaphragm with adjustable diaphragm opening inserted into the measuring tube
  • the orifice serves as a valve via which a desired flow through the measuring tube is set. For this purpose, the pressure drop across the diaphragm is measured and from this the flow rate is determined. The measured flow is used in a feedback branch to
  • the invention consists in a self-monitoring
  • Control device which has a total flow rate in the
  • control device is a pump.
  • the change profile is ramp-shaped. According to another embodiment
  • control device varies the flow rate according to the
  • the invention comprises a method for operating a
  • Flow measurement arrangement in which a bandwidth is given, within which the measured flow rates should follow the predetermined change profile, and the error message is output as soon as at least one of the measured flow rates is outside the bandwidth.
  • the invention comprises a method for operating a flow measuring arrangement according to the invention, in which is monitored on the basis of the measured flow rates, whether they have at least one expected due to the predetermined change profile characteristic property, and a deviation of the respective
  • Flowmeter measured flow rate is determined by the given change profile, if the corresponding property of the measured flow rate is missing or expected
  • one of the characteristic properties is a time interval between successive maxima and minima of the measured flow rate.
  • one of the characteristic properties is a difference between flow rate measurement values of successive maxima and minima of the measured flow rate.
  • the invention further comprises a method, which can be carried out alternatively or in addition to the said methods, for operating a flow measuring arrangement according to the invention, in which
  • a rate of change of at least one of the measured flow rates is determined
  • a deviation of one or more of these measured flowrate measurement rates from the change profile is detected when the rate of change of the respective measured flowrate deviates from a rate of change to be expected according to the change profile.
  • the invention further comprises a method for detecting leaks in the pipeline system of a flow measuring arrangement according to the invention, which has at least two flowmeters, in which
  • Piping system is diagnosed if the two medium quantities differ from each other and the flow rates measured by the two flowmeters during the period both the
  • Fig. 1 shows a schematic representation of itself
  • Fig. 2 shows: a schematic representation of a self
  • Fig. 3 shows a schematic representation of itself
  • FIG. 4 shows: a change profile which varies in a ramp around a desired value
  • Fig. 5 shows a ramp around a variable input flow rate
  • FIG. 6 shows an example of the flow meter of FIG. 1.
  • FIG. 1 shows a schematic representation of a self-monitoring flow measuring arrangement according to the invention for measuring a
  • the piping system 1 comprises a single tube into which the medium flows on the input side and from which the medium flows out on the output side.
  • the flow direction is shown in Fig. 1 by arrows.
  • the flow measuring arrangement comprises a
  • Control device 3 at least one flow meter 5 and a
  • the control device 3 is inserted into the pipeline system 1 on the inlet side and serves to vary a flow rate of the medium flowing into the pipeline system 1 overall according to a predetermined time-dependent periodic change profile.
  • the flow rate can be as
  • volume flow rate in medium volumes per unit time can be specified.
  • the changes in the flow rate imposed by the change profile have, for example, values in the order of magnitude of +/- 1% of
  • the control device 3 is preferably a pump which is activated as a function of the time-dependent change profile. Alternatively, but also a corresponding
  • Fig. 1 In the embodiment shown in Fig. 1 is a single
  • Flow meter 5 is provided.
  • Fig. 2 shows another
  • Embodiment of the invention in which in the here also only one pipe existing piping system 1 in the flow direction behind the control device 3 at two different measuring locations each one
  • Flow meter 5a, 5b is inserted.
  • Fig. 3 shows another
  • Pipe system 1 ' which here has two branches shown by way of example 9, in which each of which is supplied via a collecting pipe 1 1 medium divided into different branches and then transferred back into another header 1 1. Through the headers 1 1 each of the entire piping system 1 'supplied medium flows. In this piping system 1 'is at three different locations each one
  • the first flow meter 5c is located immediately behind the control device 3, the second
  • Flow meter 5d is located in the collecting pipe 11 arranged behind the first branch 9 and the third flow meter 5 in the collecting pipe 11 arranged behind the second branch 9.
  • flow meters 5, 5a, 5b, 5c, 5d, 5e are all suitable
  • Flowmeters are sold, for example, by the applicant.
  • the flow meters 5, 5a, 5b, 5c, 5d, 5e are each located at a measuring location, which is downstream of the control device 3 in the flow direction, and through which the entire medium flowing through the piping system 1 or 1 'flows.
  • the flow meters 5, 5a, 5b, 5c, 5d, 5e each measure the flow rate of the medium at the measuring location.
  • the flow rate may be in the form of a mass flow rate or as
  • Volume flow rate can be determined. In addition to measuring the
  • the flowmeters 5, 5a, 5b, 5c, 5d, 5e depending on the application also other flow measurements, such. determine a medium volume passing over the measuring location over a predetermined period of time or a medium mass passing the measuring location over a predetermined period of time.
  • control device 3 and the flowmeters 5, 5a, 5b, 5c, 5d, 5e are working properly, the flow rates measured with the flowmeters 5, 5a, 5b, 5c, 5d, 5e follow the predetermined time-dependent periodic pressure artificially impressed by the control device 3
  • the self-monitoring of the flow measuring arrangements according to the invention takes place in which the monitoring unit 7 monitors on the basis of the predetermined time-dependent change profile and the flow rates measured at the measuring locations whether the measured flow rates correspond to the
  • the monitoring unit 7 is supplied with the measured flow rates of the flow measuring devices 5, 5a and 5b, or 5c, 5d and 5e, as well as the time-dependent change profile.
  • the monitoring unit 7 may be a separate unit which is connected to the flow meter 5 or to the flow meters 5a and 5b, or 5c, 5d and 5e, or it may be part of one of the flow meters 5, 5a, 5b, 5c, 5d Be 5e.
  • the monitoring unit 7 in addition to the
  • Control device 3 connected.
  • the predetermined change profile can also be stored in a memory provided in the monitoring unit 7.
  • the time-dependent change profile has, for example, a ramp shape, according to which the flow rate is driven up and down by a predetermined desired value or by a given application predetermined and possibly time-varying input flow rate.
  • other periodic change profiles can be used.
  • change profiles with a continuously variable flow rate are used. This offers the advantage that the flow rates measured with the flowmeters 5, 5a, 5b, 5c, 5d, 5e also change continuously as long as they follow the change profile. Deviations from the change profile can therefore be detected very quickly.
  • An example of this is sinusoidal profiles.
  • Fig. 4 shows a ramp-shaped change profile R, according to which
  • Flow rate Q (t) is varied around a predetermined constant setpoint S around.
  • the setpoint value S can be set, for example, by means of a preferably controllable element 13, which is used in the flow direction in front of the control device 3, e.g. a valve, or directly by the control device 3 itself, are set.
  • a control circuit is provided for this purpose, in which a flow meter measures the flow rate behind the controllable element 13 or behind the control device 3 and the controllable element 13 or the control device 3 as a function of the measured
  • Flow rate controls for this purpose, for example, one of Flowmeters 5, 5a, 5b, 5c, 5d, 5e of the invention
  • Flow measuring device can be used. This is illustrated by way of example in FIG. 1, where the flow meter 5 is connected to the element 13 via the feedback 15 shown in dashed lines.
  • the control loop can also be a completely different from the invention
  • Fig. 5 shows a time-dependent ramp-shaped change profile R 'in which the flow rate Q' (t) is driven up and down by a temporally variable input flow rate E (t) predetermined by the application.
  • the monitoring unit 7 now monitors whether the with the
  • Flowmeters 5, 5a, 5b, 5c, 5d and 5e measured flow rates Qs (t), Qsa (t), Q 5b (t), Q 5c (t), Q 5d (t), and Q 5e (t) the predetermined
  • the measured flow rate Q 5 (t) has up to the time t x the same periodic, here ramped course, as the
  • Change profile R is compared to the change profile R dependent on the flow, the pipe dimensions and the distance between the control device 3 and the flow meter 5
  • the time difference ⁇ t can be determined experimentally beforehand, or else based on the time profile of the flow rate Q 5 (t) measured at the faultlessly functioning measuring arrangement and the Time dependence of the change profile can be determined. If the time difference At is greater than the period T of the change profile, the following applies:
  • At n T + At R , where n is an integer greater than or equal to 1 and At R is the modular one
  • the monitoring is now preferably carried out by specifying a bandwidth B within which the measured flow rates Qs (t), the predetermined change profile R has to follow.
  • a bandwidth B is in
  • Fig. 6 shown hatched.
  • the time course of the bandwidth B is determined by the change profile R and the time difference At. If the time difference ⁇ t is greater than a period T, then instead of the time difference ⁇ t, it is sufficient to use the residual time difference At R for the determination, since the change profile R is periodic.
  • a deviation from the given change profile can also be monitored by monitoring the occurrence of at least one characteristic property of the measured flow rate measurement Q 5 (t) to be expected on the basis of the given change profile R.
  • Characteristic features are, for example, time intervals between successive maxima and minima of the measured flow rate Q 5 (t), as well as differences between flow rate measurements of successive maxima and minima of the measured flow rate Qs (t).
  • successive maxima and minima of the measured flow rate Q 5 (t) can be determined.
  • the time intervals between successive maxima and minima of the measured deviate
  • the measured flow rate Q 5 (t) no longer follows the change profile R. Diverge differences between flow rate measurements of successive maxima and minima of the measured flow rate Q 5 (t) from the corresponding differences of the extremes of the given change profile R, Thus, the measured flow rate Q 5 (t) no longer follows the change profile R. If the measured flow rate Q 5 (t) has no recognizable extremes, there is also a deviation from the given change profile. The latter occurs in particular. On where in Fig. 6 at the time t x occurring case of frozen readings. To monitor the mentioned characteristic properties, the knowledge of the time difference At, or the residual time difference At R is not required. Another variant is the monitoring of the
  • Flow measuring arrangement includes both the monitoring of
  • Control device 3 as well as the monitoring of the flowmeter 5.
  • At least one of the measured flow rates Q 5a (t) or Q 5 b (t), or Q.5c (t), Q.5d (t), or Q 5e (t) deviates from the change profile given for the entire arrangement.
  • Flow measuring devices 5a and / or 5b, or 5c, 5d and / or 5e each an associated bandwidth B are defined, within which measured with the respective flow meter 5a and / or 5b, or 5c, 5d and / or 5e flow rate Q 5a (t) and / or Q 5 b (t), or Q 5c (t), Qsd (t), and / or Q 5e (t) has to follow the change profile.
  • an error message is output as soon as at least one of the measured
  • Flow rates Q 5a (t) or Q 5 b (t), or Q 5c (t), Qsd (t), or Q 5e (t) is outside the defined bandwidth B for them.
  • Flowmeters 5, 5a, 5b, 5c, 5d and 5e e.g. a failure or a frozen measured value, as well as malfunction of the control device 3, as well as upstream of the respective flow meter 5, 5a, 5b, 5c, 5d and 5e present pipe breaks, immediately to an error message.
  • Flow meter 5, 5a, 5b, 5c, 5d and 5e leaks that lead downstream of the leak to a significantly reduced flow rate, and deviations from an optionally predetermined desired value S for the flow rate, immediately to trigger the error message.
  • Flow measuring devices 5a, 5b, 5c, 5d, 5e these flow rates Q 5a (t) or Q 5 b (t), or Q 5c (t), Q.5d (t), or Q 5e ( ⁇ ) deviating from the given time-dependent change profile. t), and output an error message indicating these flowmeters 5a or 5b, or 5c, 5d or 5e if at least one of the flowmeters 5a or 5b, or 5c, 5d or 5e of the assembly measures a flow rate Q 5a (t ) or Q 5 b (t), or Q.5c (t), Q.5d (t), or Q 5e (t), which varies according to the given time-dependent change profile. From this it is immediately recognizable to the user that the arrangement is within the range indicated in the error message
  • Flowmeters 5a or 5b, or 5c, 5d or 5e must be checked, the remaining components of the arrangement, esp. The control device 3, but no recognizable in the manner described error.
  • the cause of the deviations may also be a malfunction of the control device 3 or of the possibly existing control circuit for setting the desired value S for the flow.
  • Piping system 1, 1 'used flowmeters 5a and 5b, or 5c and 5d or 5c and 5e or 5d and 5e the total at the two associated measurement locations in the period through the piping system 1, 1' flowed amount of media, ie their volume or mass , is determined, and it is checked whether the two medium quantities differ from each other. This deviation can be caused both by a leak and by erroneous measurement results of one of the two flowmeters 5a and 5b, or 5c and 5d, or 5c and 5e, or 5d and 5e.
  • the two different amounts of media can be traced beyond doubt to a leak in the pipeline system 1, 1 'located between the two associated measuring locations, which is then diagnosed by the arrangement.
  • Flowmeters 5a and 5b, or 5c and 5d or 5c and 5e or 5d and 5e, can be determined by the magnitude of the difference between the two

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

La présente invention concerne un agencement de débitmètre à auto-surveillance qui offre un niveau élevé de sécurité de mesure et de fiabilité et qui comporte un système de tuyauterie (1, 1') parcouru par un milieu, un dispositif de régulation (3) qui est installé côté entrée dans le système de tuyauterie (1, 1') et qui fait varier un débit de tout le milieu affluant dans le système de tuyauterie (1, 1') selon un profil de variation prédéfini, périodique et dépendant du temps (R), au moins un appareil de débitmètre (5, 5a, 5b, 5c, 5d, 5e) qui est installé dans le système de tuyauterie (1, 1'), qui se trouve en un point de mesure se trouvant derrière le dispositif de régulation dans la direction d'écoulement et via lequel s'écoule tout le milieu circulant à travers le système de tuyauterie (1, 1'), et qui mesure le débit (Q5(t), Q5a(t), Q5b(t), Q5c(t), Q5d(t), Q5e(t)) du milieu au point de mesure, et une unité de surveillance (7) qui surveille à l'aide du profil de variation prédéfini dépendant du temps (R) et des débits (Q5(t), Q5a(t), Q5b(t), Q5c(t), Q5d(t), Q5e(t)) mesurés aux points de mesure si les débits mesurés (Q5(t), Q5a(t), Q5b(t), Q5c(t), Q5d(t), Q5e(t)) suivent le profil de variation prédéfini dépendant du temps (R) et qui émet un message d'erreur lorsqu'au moins un des débits mesurés (Q5(t), Q5a(t), Q5b(t), Q5c(t), Q5d(t), Q5e(t)) s'écarte du profil de variation prédéfini dépendant du temps (R).
EP10762681A 2009-11-17 2010-10-07 Agencement de débitmètre à auto-surveillance et procédé de fonctionnement associé Withdrawn EP2502033A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009046758A DE102009046758A1 (de) 2009-11-17 2009-11-17 Sich selbst überwachende Durchflussmessanordnung und Verfahren zu deren Betrieb
PCT/EP2010/064996 WO2011061005A1 (fr) 2009-11-17 2010-10-07 Agencement de débitmètre à auto-surveillance et procédé de fonctionnement associé

Publications (1)

Publication Number Publication Date
EP2502033A1 true EP2502033A1 (fr) 2012-09-26

Family

ID=43640113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10762681A Withdrawn EP2502033A1 (fr) 2009-11-17 2010-10-07 Agencement de débitmètre à auto-surveillance et procédé de fonctionnement associé

Country Status (5)

Country Link
US (1) US9175997B2 (fr)
EP (1) EP2502033A1 (fr)
CN (1) CN102667422B (fr)
DE (1) DE102009046758A1 (fr)
WO (1) WO2011061005A1 (fr)

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US9846074B2 (en) * 2012-01-20 2017-12-19 Mks Instruments, Inc. System for and method of monitoring flow through mass flow controllers in real time
DE102012012252B4 (de) * 2012-06-22 2022-05-05 Krohne Ag System zur Durchflussmessung
US10031005B2 (en) 2012-09-25 2018-07-24 Mks Instruments, Inc. Method and apparatus for self verification of pressure-based mass flow controllers
CN110244780A (zh) * 2014-03-11 2019-09-17 Mks 仪器公司 用于实时监测穿过质量流量控制器的流量的系统以及方法
DE102015107366B3 (de) * 2015-05-11 2016-01-21 Krohne Messtechnik Gmbh Verfahren zum Betreiben eines Durchflussmessgeräts und diesbezügliches Durchflussmessgerät
CN105806570A (zh) * 2016-05-16 2016-07-27 沈阳紫微机电设备有限公司 气体测漏检测装置
CN106644317B (zh) * 2016-12-30 2019-09-17 楚天智能机器人（长沙）有限公司 一种成型泡罩的真空检测方法、检测装置及泡罩机
CN107576373B (zh) * 2017-08-17 2020-06-30 浙江邦业科技股份有限公司 一种合成氨系统原料气流量检测精度判断及矫正方法
CN107676634B (zh) * 2017-10-19 2019-07-05 郑州尚润电子科技有限公司 供水管网漏损检测分析方法、装置及系统
CN110848578B (zh) * 2018-08-21 2021-07-30 湖南大学 一种基于pdd模型的城市供水管网既有漏损定位方法
CN111521840B (zh) * 2020-04-20 2021-12-07 杭州清泚源科技有限公司 一种用于城市地下管网的监测系统及监测方法
CN114414148A (zh) * 2021-12-13 2022-04-29 上海北漠景观幕墙科技股份有限公司 一种建筑物的安全监测方法、系统

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Also Published As

Publication number Publication date
US20120216600A1 (en) 2012-08-30
CN102667422A (zh) 2012-09-12
US9175997B2 (en) 2015-11-03
WO2011061005A1 (fr) 2011-05-26
DE102009046758A1 (de) 2011-05-19
CN102667422B (zh) 2016-01-27

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