EP3146299A1 - Device for measuring the volumetric flow rate of a fluid - Google Patents
Device for measuring the volumetric flow rate of a fluidInfo
- Publication number
- EP3146299A1 EP3146299A1 EP15720627.7A EP15720627A EP3146299A1 EP 3146299 A1 EP3146299 A1 EP 3146299A1 EP 15720627 A EP15720627 A EP 15720627A EP 3146299 A1 EP3146299 A1 EP 3146299A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- overvoltage
- measuring
- holding voltage
- control
- ratio
- 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.)
- Ceased
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 231100001261 hazardous Toxicity 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 239000002800 charge carrier Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000012811 non-conductive material Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor
Definitions
- the invention relates to a device for measuring the volume flow of a fluid, which flows through a measuring tube in the direction of the longitudinal axis, with a coil arrangement, with at least two with the fluid coupling
- Measuring electrodes and with a control / evaluation unit which generates in connection with the coil arrangement a periodically changing the polarity, extending substantially transverse to the longitudinal axis of the measuring tube magnetic field and during a measurement phase at a substantially constant magnetic field based on a voltage induced in the measuring electrodes, the volume flow of the fluid in the measuring tube.
- the at least two measuring electrodes are galvanically or capacitively coupled to the fluid.
- the coil arrangement preferably has two diametrically arranged coils, usually each with an integrated coil core. Depending on the configuration, only one coil with or without a winding core can be provided, or more than two coils are used each with or without a coil core.
- Corresponding measuring devices are called magnetic-inductive
- Magnetic-inductive flowmeters use the principle of electrodynamic induction for volumetric flow measurement:
- Charge carriers of the fluid moved perpendicular to a magnetic field induce a voltage in measuring electrodes which are likewise arranged substantially perpendicular to the flow direction of the fluid. This voltage induced in the measuring electrodes is proportional to that across the cross section of the
- Measuring tube averaged flow velocity of the medium it is therefore proportional to the volume flow.
- the current profile in the coil arrangement corresponds to the course of the magnetic field. Due to eddy currents, which occur during the switching of the magnetic field in the pole shoes and cores of the coil assembly, occur in reality deviations from the ideal case. Of the coil current measured outside the coil arrangement therefore corresponds to the sum of the current flowing in the coil arrangement and the current generated by the eddy currents. If the current measured outside the coil arrangement is used as the controlled variable, then the current is not constant but the magnetic field is constant. This applies until the eddy currents have subsided.
- the magnetic field has a constant magnetic field value corresponding to the constant current setpoint when the current maximum is reached.
- the duration of the switching phase is given by the characteristic of the coil current. Since the stability of the measurement signal u.a. is also affected by the inductive coupling of the coil assembly to the measuring electrodes, both the voltage across the coil assembly and the current through the coils must be constant during the measurement of the voltage difference between the measuring electrodes. In the solution known from the prior art, this is only the case because of the asymptotic approach to the final value when the
- the holding voltage depends on
- Holding voltage defined as the product of resistance and rated current. Since the resistance is temperature-dependent, the holding voltage changes at a constant overvoltage. Since the overvoltage is usually unregulated, fluctuations in the overvoltage can also lead to an uncontrolled one
- the invention has for its object to ensure an improved stability of the zero point in a magnetic-inductive device or in a magnetic-inductive method for measuring the volume flow.
- control / evaluation unit acts on the coil arrangement during a deceleration phase with an overvoltage, wherein the deceleration phase for
- Time of switching the polarity of the magnetic field begins and ends at the time of the beginning of the measurement phase, and that the control / evaluation unit, the coil assembly during the period of
- control / evaluation unit the ratio of
- control / evaluation unit controls the ratio of overvoltage to holding voltage by a corresponding change of the overvoltage to a substantially constant value.
- control / evaluation unit regulates the ratio of overvoltage to holding voltage to a substantially constant value by determining the duration of the
- Overvoltage to holding voltage is greater than 1.
- the predetermined value of the ratio of overvoltage to holding voltage is preferably between 2 and 10. The predetermined value depends in particular on the desired measuring speed and / or the sensor type used of the electromagnetic flowmeter and / or on the application in which the sensor type is used ,
- control / evaluation selects in the case of
- the predetermined value of the ratio of overvoltage to holding voltage as large as it is possible in the context of the available power. Furthermore, an advantageous embodiment of the magnetic-inductive flowmeter suggests that the control / evaluation unit in the case of an application, which is located in a hazardous area, the predetermined value of the ratio of overvoltage to holding voltage so low that the power consumption allowed for the hazardous area is not exceeded.
- Time of switching the polarity of the magnetic field begins and at the time of the beginning of the measuring phase ends, and that the coil assembly is applied during the period of the measuring phase with a substantially constant holding voltage, wherein the ratio of overvoltage to holding voltage is regulated to a substantially constant value ,
- FIG. 1 shows a schematic representation of a first embodiment of the device according to the invention
- FIG. 3 is a diagram showing the time course of the coil voltage U s at different ratios of overvoltage to holding voltage
- Device according to the invention. 1 shows a schematic representation of a first embodiment of the device 1 according to the invention.
- the measuring tube 2 is traversed by the fluid 1 1 in the direction of the longitudinal axis of the measuring tube 3.
- the fluid 1 1 is at least to a small extent electrically conductive.
- the measuring tube 2 itself is made of a non-conductive material, or it is lined at least on its inner surface with a non-conductive material.
- the perpendicular to the flow direction of the fluid 1 1 aligned magnetic field B is generated via the diametrically arranged coil assembly 6, 7 or via two electromagnets. Under the influence of the magnetic field B, charge carriers located in the fluid 1 1 migrate depending on the polarity to the two oppositely poled measuring electrodes 4, 5. The to the
- Measuring electrodes 4, 5 voltage is proportional to the averaged over the cross section of the measuring tube 2 flow rate of the fluid 1 1, d. H. it is a measure of the volume flow of the fluid 1 1 in the measuring tube 2.
- the measuring tube 2 is incidentally via connecting elements, for. As flanges, which are not shown separately in the drawing, connected to a pipe system through which the fluid flows through 1 1.
- the measuring electrodes 4, 5 are in direct contact with the fluid 11; however, the coupling can also be capacitive in nature.
- the control / evaluation unit 8 is connected via the connecting line 16 to an input / output unit 9.
- the evaluation / control unit 8 is associated with the memory unit 10.
- the current profile corresponds to the profile of the magnetic field B generated by the coil arrangement 6, 7.
- the coils of a coil arrangement 6, 7 which are used in magnetic-inductive sensors usually have coil cores and / or pole shoes on.
- the control / evaluation Unit 8 is applied to the coil assembly 6, 7 so that the magnetic field B periodically changes its direction.
- the coil current I L is constant, opposite and equal in magnitude. Due to the eddy currents produced in the pole shoes and coil cores, this ideal case does not occur in reality. Rather, the current i M measured outside the coil arrangement 6, 7 always corresponds to that
- FIG. 2 A corresponding equivalent circuit diagram of the coil arrangement 6, 7 is shown in FIG. 2.
- control / evaluation unit acts on the
- Switching the polarity of the magnetic field B begins and ends at the time of the beginning of the measuring phase.
- the control / evaluation unit 8 loads the coil arrangement 6, 7 with a substantially constant holding voltage. According to the invention, the control / evaluation unit 8 regulates the ratio of overvoltage
- control / evaluation unit 8 controls the ratio of overvoltage
- Holding voltage by appropriate change of the overvoltage to a substantially constant value Alternatively regulates the control / evaluation unit 8, the ratio of overvoltage to holding voltage to a in
- Power supply is limited to a maximum allowable value, it is not possible in many applications in industrial metrology, to increase the surge as desired.
- FIG. 4 shows a circuit arrangement which is used in the magnetic-inductive flowmeter 1 according to the invention and which is suitable for carrying out the method according to the invention.
- Flowmeter 1 periodically switched.
- an H-circuit is usually used: in the first half-period, the two switches S2 and S3 are closed, and the two switches S1, S4 are open. In the following half-period, the two switches S2, S3 are opened, and the two switches S1, S4 are closed.
- the coil current I M measured outside the coil arrangement 6, 7 flows through the coil arrangement 6, 7 in two successive half-periods in the reverse direction. This is accompanied by a change in the polarity of the magnetic field B.
- the voltage difference AU S across the two coils of the coil arrangement 6, 7 tapped voltages are from an A / D converter 17th
- the voltage difference AU S is fed to the microcontroller 21.
- the actual value of the coil current I M is measured across the resistor R sense , digitized by the AD converter 18 and also the
- the coil arrangement 6, 7 during the period of the measuring phase with a substantially constant holding voltage
- Overvoltage to hold voltage controls to a substantially constant value.
- the ratio of overvoltage to holding voltage is in the
- Ratio of overvoltage to holding voltage by corresponding change of overvoltage
- the default value of the ratio of overvoltage and holding voltage is application-dependent. If a high measuring speed is desired - for example because the volume flow shows high dynamics - then the predetermined value of the ratio should be as large as possible: the higher the overvoltage, the lower the time duration of the deceleration phase and the faster the measured values can be in subsequent measuring phases Will be provided. In the case of an application in which a high measuring speed is required due to high dynamics, the control / evaluation unit 8 preferably selects the predetermined value of the ratio of overvoltage to holding voltage as large as is possible within the scope of the available power.
- an advantageous embodiment of the magnetic-inductive flowmeter suggests that the control / evaluation unit 8 in the case of an application, which is located in a hazardous area, the predetermined value of the ratio of overvoltage to holding voltage so low chooses that for the explosion-endangered Range allowed power consumption is not exceeded. If the two boundary conditions mentioned above are to be fulfilled at the same time, then the control / evaluation unit will make a compromise proposal. In addition to specifying values for the ratio of overvoltage to
- Holding voltage through the control / evaluation unit there is also the Possibility for the user to be able to adapt the default value to the real application by optimizing the input.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014107200.6A DE102014107200A1 (en) | 2014-05-22 | 2014-05-22 | Device for measuring the volume flow of a fluid |
PCT/EP2015/058481 WO2015176891A1 (en) | 2014-05-22 | 2015-04-20 | Device for measuring the volumetric flow rate of a fluid |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3146299A1 true EP3146299A1 (en) | 2017-03-29 |
Family
ID=53052811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15720627.7A Ceased EP3146299A1 (en) | 2014-05-22 | 2015-04-20 | Device for measuring the volumetric flow rate of a fluid |
Country Status (5)
Country | Link |
---|---|
US (1) | US10215602B2 (en) |
EP (1) | EP3146299A1 (en) |
CN (1) | CN106461433B (en) |
DE (1) | DE102014107200A1 (en) |
WO (1) | WO2015176891A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014107200A1 (en) | 2014-05-22 | 2015-11-26 | Endress + Hauser Flowtec Ag | Device for measuring the volume flow of a fluid |
DE102016110024A1 (en) * | 2016-05-31 | 2017-11-30 | Endress + Hauser Flowtec Ag | Method for operating an electromagnetic flowmeter for measuring the flow rate or the volume flow of a medium in a measuring tube |
DE102016112742A1 (en) * | 2016-07-12 | 2018-01-18 | Endress+Hauser Flowtec Ag | Method for measuring the flow velocity or the volume flow of a medium by means of a magnetic-inductive flowmeter and a magnetic-inductive flowmeter |
DE102016122495B4 (en) | 2016-11-22 | 2022-03-17 | Endress + Hauser Flowtec Ag | Method for operating a magnetic-inductive flow meter |
DE102018115628B4 (en) * | 2018-06-28 | 2020-02-13 | Endress+Hauser Flowtec Ag | Procedure for commissioning a magnetic-inductive flow meter and a magnetic-inductive flow meter |
DE102021118264A1 (en) * | 2021-07-14 | 2023-01-19 | Endress+Hauser Flowtec Ag | Electromagnetic flow meter |
DE102021131698A1 (en) * | 2021-12-01 | 2023-06-01 | Endress+Hauser Flowtec Ag | Electromagnetic flow meter |
DE102021131692A1 (en) * | 2021-12-01 | 2023-06-01 | Endress + Hauser Flowtec Ag | Electromagnetic flow meter |
DE102021131693A1 (en) * | 2021-12-01 | 2023-06-01 | Endress + Hauser Flowtec Ag | Electromagnetic flow meter |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
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US3396314A (en) * | 1965-04-13 | 1968-08-06 | Rca Corp | Overdrive circuit for inductive loads |
BE759189A (en) * | 1969-11-28 | 1971-05-21 | Cit Alcatel | CURRENT CONTROL CIRCUIT IN INDUCTIVE LOAD |
US4204240A (en) * | 1978-10-26 | 1980-05-20 | Fischer & Porter Co. | High-voltage impulse driver for electromagnetic flowmeter |
US4784000A (en) * | 1987-01-15 | 1988-11-15 | Emerson Electric Co. | Magnetic flowmeter coil driver and method |
JPH06258113A (en) * | 1993-03-08 | 1994-09-16 | Yamatake Honeywell Co Ltd | Electromagnetic flowmeter |
CN1096604C (en) | 1998-07-03 | 2002-12-18 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Method of regulating coil current of electromagnetic flow sensors |
EP0969268A1 (en) | 1998-07-03 | 2000-01-05 | Endress + Hauser Flowtec AG | Method of regulating the coil current of electromagnetic flow sensors |
US6031740A (en) * | 1998-07-03 | 2000-02-29 | Endress + Hauser Flowtec Ag | Method of regulating the coil current of electromagnetic flow sensors |
DE10312058A1 (en) * | 2003-03-18 | 2004-09-30 | Endress + Hauser Flowtec Ag, Reinach | Device for measuring the volume flow of a measuring medium in a measuring tube |
US7260486B2 (en) * | 2004-09-22 | 2007-08-21 | Endress + Hauser Flowtec Ag | Method for operating and/or reviewing a magneto-inductive flow meter |
DE102005031665A1 (en) * | 2005-07-05 | 2007-01-11 | Endress + Hauser Flowtec Ag | Method for determining the operating point of a magnetic-inductive flowmeter |
DE502005009845D1 (en) * | 2005-09-21 | 2010-08-12 | Siemens Ag | METHOD FOR OPERATING AN ELECTROMAGNETIC FLOWMETER AND ELECTROMAGNETIC FLOWMETER |
JP4754932B2 (en) * | 2005-10-17 | 2011-08-24 | 株式会社山武 | Electromagnetic flow meter |
DE102005050655A1 (en) * | 2005-10-20 | 2007-04-26 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
DE102006023916A1 (en) | 2006-05-19 | 2007-11-22 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
DE102006054635A1 (en) | 2006-11-17 | 2008-05-21 | Endress + Hauser Flowtec Ag | Device for measuring the volume or mass flow of a medium in a pipeline |
DE102007014469A1 (en) * | 2007-03-22 | 2008-09-25 | Endress + Hauser Flowtec Ag | A method for predictive maintenance and / or method for determining the electrical conductivity in a magnetic inductive flowmeter |
DE102009002539A1 (en) * | 2009-04-21 | 2010-10-28 | Endress + Hauser Flowtec Ag | Magnetic-inductive flow measuring device and method for operating the same |
DE102010029762A1 (en) * | 2010-06-07 | 2011-12-08 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Method for determining a residual coupling of an inductive conductivity sensor |
DE102012105716A1 (en) * | 2012-06-28 | 2014-01-02 | Endress + Hauser Flowtec Ag | Method for controlling a coil current of a magneto-inductive flowmeter |
DE102012107534A1 (en) * | 2012-08-16 | 2014-02-20 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
DE102014107200A1 (en) | 2014-05-22 | 2015-11-26 | Endress + Hauser Flowtec Ag | Device for measuring the volume flow of a fluid |
DE102015116771B4 (en) * | 2015-10-02 | 2021-07-01 | Krohne Messtechnik Gmbh | Method for setting a constant magnetic field strength of a magnetic field in a magneto-inductive flow measuring device and related magneto-inductive flow measuring device |
-
2014
- 2014-05-22 DE DE102014107200.6A patent/DE102014107200A1/en active Pending
-
2015
- 2015-04-20 WO PCT/EP2015/058481 patent/WO2015176891A1/en active Application Filing
- 2015-04-20 CN CN201580026321.1A patent/CN106461433B/en active Active
- 2015-04-20 US US15/309,597 patent/US10215602B2/en active Active
- 2015-04-20 EP EP15720627.7A patent/EP3146299A1/en not_active Ceased
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2015176891A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN106461433B (en) | 2019-12-17 |
US20170146377A1 (en) | 2017-05-25 |
CN106461433A (en) | 2017-02-22 |
DE102014107200A1 (en) | 2015-11-26 |
WO2015176891A1 (en) | 2015-11-26 |
US10215602B2 (en) | 2019-02-26 |
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