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WO2019193453A1 - Émetteur de niveau magnétostrictif comportant un capteur d'orientation - Google Patents

Émetteur de niveau magnétostrictif comportant un capteur d'orientation Download PDF

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Publication number
WO2019193453A1
WO2019193453A1 PCT/IB2019/052435 IB2019052435W WO2019193453A1 WO 2019193453 A1 WO2019193453 A1 WO 2019193453A1 IB 2019052435 W IB2019052435 W IB 2019052435W WO 2019193453 A1 WO2019193453 A1 WO 2019193453A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetostrictive
level
sensor
orientation
measure
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
Application number
PCT/IB2019/052435
Other languages
English (en)
Inventor
Shanthala KAMATH
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz 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 ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of WO2019193453A1 publication Critical patent/WO2019193453A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2962—Measuring transit time of reflected waves
    • G01F23/2963—Measuring transit time of reflected waves magnetostrictive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
    • G01D5/485—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means using magnetostrictive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means

Definitions

  • the present invention relates generally to magnetostrictive level transmitter for transmitting level of liquids and more particularly to a magnetostrictive level transmitter with orientation sensors.
  • Magnetostrictive level transmitters/sensors are devices based on magnetostrictive phenomenon and are used in wide variety of industrial applications to measure the level of liquids in containers. Magnetostriction is a property exhibited by ferromagnetic materials wherein there is a change in dimension of the element on application of an external magnetic field. An effect observed in magnetostrictive materials is called the Wiedemann effect where twisting of these materials takes place on application of a helical magnetic field.
  • Magnetostrictive level transmitters/sensors use the Wiedemann effect to determine the level or position of liquids in containers.
  • An initial electrical current pulse is generated and provided to a wire exhibiting Magnetostriction property.
  • the wire is usually housed in a sensor tube.
  • the initial electrical pulse creates a magnetic field which travels down the magnetostrictive wire inside the senor tube.
  • a permanent magnet in the form of a float is used to mark a position along the sensor tube housing the Magnetostrictive wire.
  • the interaction of the magnetic field around the wire and the magnetic float causes a torsional stress wave to be induced in the magnetostrictive wire. This torsion propagates along the wire at a known velocity, from the position of the magnetic float and toward both ends of the wire.
  • a processor associated with the device electronics of the magnetostrictive level sensor/transmitter converts the received mechanical torsion into an electrical return pulse. Then the processor measures the elapsed time between the start and return pulses and converts it into a position (level) measurement which is proportional to the position (level) of the float along the sensor tube.
  • Magnetostrictive position sensors generally can be mounted in two orientations - top and bottom to allow for various measurement requirements.
  • the mounting orientation either straight or inverted needs to be manually fed into the device electronics via the Human Machine Interface (HMI)/faceplate or via a means of communication with the magnetostrictive level transmitter during configuration so that the measurement and calculations can be done based on the mounting orientation.
  • HMI Human Machine Interface
  • Such a manual process is susceptible to errors.
  • the magnetic floats being used in the magnetostrictive position sensors can affect the measurement value owing to magnetic differences and dimension/orientation change in use or positioning of the magnetic float. Hence, in such cases, one may find differences in waveform characteristics of the return pulse, which may result in incorrect or less accurate assessment of elapsed time between the start and return pulse.
  • the present invention provides a magnetostrictive level transmitter for liquid level measurement in a container containing liquid
  • the magnetostrictive level transmitter comprising: a sensor assembly having a: sensor tube housing a magnetostrictive wire; a sensor electronics board with a processor for the liquid level measurement and comprising an electronic circuitry for imparting an electrical start pulse current in the magnetostrictive wire; a transmitter having a communication module for communicating the liquid level measurement; at least one magnetic float comprising a permanent magnet, the magnetic float being movable along the length of the magnetostrictive wire, the position of the magnetic float being indicative of the liquid level ; an orientation sensor to detect the orientation of mounting of the sensor assembly; wherein the electric start pulse current in the magnetostrictive wire causes a torsional wave in the magnetostrictive wire upon interaction with a magnetic field caused by the magnetic float, the torsional wave detectable by the sensor electronics board for conversion to an electrical return pulse current and an elapsed time between the electrical start pulse current and electrical return pulse current is determined to provide
  • the orientation sensor to detect the orientation of mounting of the sensor assembly is at least one of an accelerometer and a tilt switch.
  • two magnetic floats are provided for sensing the level of two immiscible liquids in the container, the two magnetic floats causing two torsional waves detectable by the sensor electronics board for conversion to two electrical return pulses, wherein the processor provides a corrected measure by processing the two electrical return pulses.
  • the magnetostrictive level transmitter is inserted in an orientation from at least one of top of the container and bottom of the container.
  • the measure of the level of the liquid in the container is communicated to a process control system.
  • the transmitter communicates the measure of the level of the liquid in the container to a remote control location for storage or processing of measurement.
  • Figure 1 shows a magnetostrictive level sensor inserted in a container with a level of liquid to be measured.
  • Figure 2 shows the magnetostrictive level sensor being mounted from the bottom of the vessel.
  • Figure 3 shows a magnetostrictive level sensor 300 with two floats.
  • Figure 4 shows a block diagram representing the blocks and components essentials for operation of the magnetostrictive level transmitter.
  • the present invention is related to magnetostrictive wire based position transmitter.
  • the present invention provides for measurement of liquid levels using magnetostrictive wire based position transmitter with automated detection of mounting orientation of the magnetostrictive wire based position transmitter.
  • magnetostrictive position sensors can be mounted in two orientations - top (straight) and bottom (inverted) and the mounting orientation either straight or inverted.
  • the present invention discloses a magnetostrictive level transmitter wherein an automated detection of the orientation of the device is effectuated during the operation of the magnetostrictive level transmitter.
  • FIG. 1 shows a magnetostrictive level sensor 100 inserted in a tank/container 110 with a level of liquid 120 to be measured.
  • the operations of a magnetostrictive level sensors are well known in the art.
  • the magnetostrictive level sensor 100 shown in Figure 1 is inserted in the tank to measure in a straight manner.
  • the magnetostrictive level sensor 100 comprises a sensor assembly comprising a sensor tube 130.
  • the sensor tube 130 contains a magnetostrictive wire 140, which is pulsed at fixed time intervals.
  • the sensor assembly has a sensor electronics board 150 with a processor (not shown) for the liquid level measurement.
  • the sensor electronics board 150 is equipped with an orientation sensor for the purpose of measurement and an electronic circuitry for imparting an electrical start pulse current in the magnetostrictive wire.
  • a transmitter having a communication module for communicating the liquid level measurement is also provided.
  • a display unit or Human Machine Interface (HMI) is also provided for displaying the measured level of the liquid.
  • HMI Human Machine Interface
  • a magnetic float 160 that floats in the liquid is provided and it comprises a permanent magnet.
  • the float is movable along the length of the magnetostrictive wire on the sensor tube and the position of the magnetic float 160 is determined as indicative of the liquid level.
  • the interaction of the magnetic field from the electrical current pulse with the magnetic field created by the permanent magnet(s) in the magnetic float 160 causes a torsional stress wave to be induced in the magnetostrictive wire 140.
  • This torsion wave propagates along the wire 140 at a known velocity, starting from the position of the magnetic float 160.
  • a piezo-magnetic sensing element located in the sensor electronics board 150 detects and converts the received mechanical torsion into an electrical return pulse.
  • Sensor electronics measure the elapsed time 180 between the start 185 and return pulses 190 (a time instant generally associated with the time instant of detection of a peak in the return pulse waveform), which is proportional to the liquid level (position of float) being measured.
  • Sensor electronics includes the piezo-magnetic sensing element, the current pulsing equipment, the return pulse detection equipment and the various electronic components used for signal conditioning, determination of return pulse peak and elapsed time between the start and return pulses, excluding the magnetostrictive wire.
  • the time between the electrical start pulse current and electrical return pulse current is processed by the sensor electronics board having an electronics and digital signal processing unit with a processor to provide a measure representative of the level of the liquid.
  • the magnetic float 160 is generally of stainless steel construction, or some other material inert to the environmental conditions and material within the tank.
  • the magnetic float 160 has a center bore and is slidable on the sensor tube 130, floating or moving with the height or level of a liquid in the tank 110.
  • two or more magnetic float can be used to determine liquid levels when multiple liquid separable by density are used in the same container. It can be understood for the person skilled in the art that the number of return pulse detected will correspond to the number of floats used in the magnetostrictive level sensor i.e. there will be one return pulse when one float is used to measure level of a single liquid and two return pulses when two floats are used to measure level of two liquids in a container.
  • more than one float may be used for sensing the level of each type of fluid.
  • the torsion wave from each float is represented by one large peak and a trailing smaller peak in the opposite direction. The measurement is accurate when the measurement is made at the largest peak.
  • the magnetostrictive level sensor also comprises an orientation sensor 170 (accelerometer or tilt sensor) to detect the orientation of mounting of the sensor assembly.
  • the orientation sensor 170 as shown in the Figure 1 is provided in the neck region of the magnetostrictive level sensor as a part of the sensor board electronics.
  • the magnetic float may be inserted in a specific orientation for sliding along the sensor tube. If the magnetic float is not inserted in the specific orientation as that during the time of calibration/commissioning or changed during a maintenance activity, there can be a difference in the nature of interaction between the magnetic field by the electric start pulse travelling in the sensor tube and the magnetic field from the magnetic float from that observed initially. This can cause variation in the measurement as the nature of the torsion wave/ electric return pulse characteristic (e.g. pulse wave shape) can differ t Hence there is a need that the signal conditioning unit automatically detects such variations in the pulse shape and properly determine the elapsed time to obtain a correct value of liquid level measurement.
  • the signal conditioning unit automatically detects such variations in the pulse shape and properly determine the elapsed time to obtain a correct value of liquid level measurement.
  • the signal processing unit in the sensor electronics board thus additionally provides for any correction that is required to correct the measurement (first value of measurement) resulting from the orientation of the magnetostrictive level sensor and also account the resultant variations in the torsional wave arising out of the interaction of the magnetic field from the magnetic float and the electrical start pulse i.e. for any change in the measured pulse wave shape.
  • the processor picks up the positive going peak (independent of whether it is the largest peak or the trailing smaller peak) and makes the level calculation.
  • the processor picks up the positive going peak (independent of whether it is the largest peak or the trailing smaller peak) and makes the level calculation.
  • an user views the signal waveform and sets the signal polarity so that the large peak is in the positive orientation. This ensures that the positive peak is picked for accurate measurement in the prior art method.
  • the present invention provides for an automated detection of the largest peak and adjusting the signal polarity automatically whilst eliminating a manual step and improve accuracy.
  • the present invention provides for an orientation sensor, such as a tilt switch or an accelerometer in the neck region to automatically detect the mounting orientation and automatically accounting for the orientation in device operation while processing of the detected signal corresponding to the level(s) of the liquid(s).
  • an orientation sensor such as a tilt switch or an accelerometer in the neck region to automatically detect the mounting orientation and automatically accounting for the orientation in device operation while processing of the detected signal corresponding to the level(s) of the liquid(s).
  • a magnetostrictive level sensor can be mounted with the sensor tube inserted from the top of the vessel or from the bottom of the vessel, based on the application.
  • Figure 2 shows the magnetostrictive level sensor 200 being mounted from the bottom of the vessel.
  • the measurement electronics in a magnetostrictive level sensor needs to be aware of the mounting orientation in order to convert the measurement to the actual level height of the liquid in physical units.
  • mount orientation is essential to calculate the correct level value reading in the device, and the processor in the sensor electronics board is configured to make a correction according to the detected orientation of the magnetostrictive level sensor.
  • a transmitter unit 450 is attached to the sensor electronics board 420 having a communication module for communicating the liquid level measurement.
  • a display unit or Human Machine Interface (HMI) 460 is also provided for displaying the measured level of the liquid.
  • the magnetic float 470 comprising a permanent magnet is provided which is movable along the length of the magnetostrictive wire and the position of the magnetic float 470 is indicative of the liquid level.
  • the magnetostrictive sensor measurement of level is processed with the electrical return pulse waveform extracted from the torsional wave and the waveform is said to have multiple peak (damped oscillating signal) with one large positive peak for single level measurement carried out with a single magnetic float and two large positive peaks i.e. two damped oscillating signal for two-level measurement carried out with two magnetic floats.
  • the measurement circuitry i.e. the sensor electronics board (with its hardware, software/firmware for processing of detected signal) are accordingly designed to detect the correct peak of the electrical return pulse and determine the liquid level(s).
  • the electrical return pulse waveform is processed/conditioned by the measurement circuitry and is configured to perform processing/conditioning for the positive polarity of the waveform.
  • the processor uses peak detection techniques to process the number of peaks and then determine peak (here in the example, positive peak as the waveform characteristics has positive peak). If the pulse has a negative peak as the largest peak, the processing/conditioning is configured suitably (automatically) to process the waveform and detect the negative peak by the processor.
  • the peaks are positive oriented and the default signal processing e.g. that performed by an electronic signal processing detects a positive peak, no change or correction in further signal processing by the processor or any further configuration is needed/performed.
  • the corrected measure of the first measure is obtained by a correction to take into account both the orientation of the magnetostrictive sensor which is based on detected orientation by the orientation sensor and the variation in wave shape of the converted electrical return pulse observed due to the interaction between the magnetic field from the magnetic float and the magnetic field of the electrical start pulse.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

La présente invention concerne un émetteur de niveau magnétostrictif à détection d'orientation. La présente invention concerne un émetteur de niveau magnétostrictif comprenant : un tube de capteur logeant un fil magnétostrictif ; une carte d'unité électronique de capteur dotée d'un processeur ayant une circuiterie pour communiquer une impulsion de démarrage électrique dans le fil magnétostrictif ; un émetteur pour communiquer des mesures ; un flotteur magnétique, la position du flotteur magnétique étant indicative du niveau de liquide ; un capteur d'orientation pour détecter l'orientation du montage ; le processeur fournissant une mesure du niveau de liquide obtenue par correction d'une première mesure du niveau de liquide en prenant en compte : (a) l'orientation du capteur magnétostrictif pour décrire correctement la position du flotteur par rapport à l'orientation détectée du montage, (b) des variations dues à une interaction entre le champ magnétique provenant du flotteur magnétique et le champ magnétique de l'impulsion de démarrage électrique.
PCT/IB2019/052435 2018-04-02 2019-03-26 Émetteur de niveau magnétostrictif comportant un capteur d'orientation Ceased WO2019193453A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201841012404 2018-04-02
IN201841012404 2018-04-02

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Publication Number Publication Date
WO2019193453A1 true WO2019193453A1 (fr) 2019-10-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113340382A (zh) * 2021-05-27 2021-09-03 北京锐达仪表有限公司 反射回波可调的磁致伸缩液位计以及液位检测方法
CN113670415A (zh) * 2021-07-20 2021-11-19 北京锐达仪表有限公司 多传感器磁致伸缩液位计以及液位检测方法
CN113959532A (zh) * 2021-10-25 2022-01-21 北京锐达仪表有限公司 多回波跟踪的磁致伸缩液位计及液位测量方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3135487B2 (ja) * 1995-08-10 2001-02-13 株式会社北澤電機製作所 液体の比重、液面高さ及び液温測定装置
US6351117B1 (en) * 1999-09-20 2002-02-26 Balluff, Inc. Method and apparatus for generating transducer output pulses compensated for component variations
US6601000B1 (en) * 1998-08-27 2003-07-29 Bartec Logistic Management Gmbh Device and method for volume determination
US20040129075A1 (en) * 2001-02-01 2004-07-08 Fluent Systems, Llc. Remote fluid level detection system
KR101573207B1 (ko) * 2015-05-29 2015-12-01 (주) 다인레벨 유조차의 정량 적재 여부 확인 방법 및 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3135487B2 (ja) * 1995-08-10 2001-02-13 株式会社北澤電機製作所 液体の比重、液面高さ及び液温測定装置
US6601000B1 (en) * 1998-08-27 2003-07-29 Bartec Logistic Management Gmbh Device and method for volume determination
US6351117B1 (en) * 1999-09-20 2002-02-26 Balluff, Inc. Method and apparatus for generating transducer output pulses compensated for component variations
US20040129075A1 (en) * 2001-02-01 2004-07-08 Fluent Systems, Llc. Remote fluid level detection system
KR101573207B1 (ko) * 2015-05-29 2015-12-01 (주) 다인레벨 유조차의 정량 적재 여부 확인 방법 및 시스템

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113340382A (zh) * 2021-05-27 2021-09-03 北京锐达仪表有限公司 反射回波可调的磁致伸缩液位计以及液位检测方法
CN113670415A (zh) * 2021-07-20 2021-11-19 北京锐达仪表有限公司 多传感器磁致伸缩液位计以及液位检测方法
CN113670415B (zh) * 2021-07-20 2023-09-19 北京锐达仪表有限公司 多传感器磁致伸缩液位计以及液位检测方法
CN113959532A (zh) * 2021-10-25 2022-01-21 北京锐达仪表有限公司 多回波跟踪的磁致伸缩液位计及液位测量方法
CN113959532B (zh) * 2021-10-25 2024-05-17 北京锐达仪表有限公司 多回波跟踪的磁致伸缩液位计及液位测量方法

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