US20090301187A1 - Multichamber ultrasonic sensor for determining a liquid level - Google Patents

Multichamber ultrasonic sensor for determining a liquid level Download PDF

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Publication number
US20090301187A1
US20090301187A1 US12/309,432 US30943207A US2009301187A1 US 20090301187 A1 US20090301187 A1 US 20090301187A1 US 30943207 A US30943207 A US 30943207A US 2009301187 A1 US2009301187 A1 US 2009301187A1
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United States
Prior art keywords
chamber
measuring chamber
sensor according
fluid
ultrasound sensor
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Abandoned
Application number
US12/309,432
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English (en)
Inventor
Oliver Beyer
Henning Grotevent
Bernd Harigel
Manfred Roth
Gerd Unverzagt
Andreas Weibert
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Conti Temic Microelectronic GmbH
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Conti Temic Microelectronic GmbH
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Assigned to CONTI TEMIC MICROELCTRONIC GMBH reassignment CONTI TEMIC MICROELCTRONIC GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARIGEL, BERND, UNVERZAGT, GERD, BEYER, OLIVER, GROTEVENT, HENNING, ROTH, MANFRED, WEIBERT, ANDREAS
Publication of US20090301187A1 publication Critical patent/US20090301187A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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
    • 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
    • G01F23/32—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 using rotatable arms or other pivotable transmission elements
    • G01F23/36—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 using rotatable arms or other pivotable transmission elements using electrically actuated indicating means

Definitions

  • the invention relates to an ultrasound sensor for determining a fluid level in accordance with the generic term of claim 1 .
  • Sensors of this type are used in automobile technology, for example, for measuring the level of engine oil or fuel.
  • a sensor on the container floor emits ultrasound impulses. The echo from the fluid surface is reabsorbed by the transmission receiver. The filling level is proportionate to the sound run time.
  • the sound is guided through a hollow conduit or sound conducting tube which is arranged in a container. At the lower end of the sound conducting tube, the ultrasound transmission receiver is attached. The tube is positioned in the fluid and is filled with fluid via at least one offset opening until the filling level corresponds to that in the container.
  • the filling level is measured using ultrasound.
  • An embodiment of this type is primarily designed for measuring the filling level with irregularly formed fluid containers. A great disadvantage of this arrangement is that foam from the fluid to be determined can penetrate into the sound conducting tube and slightly falsify the determination of the fluid level.
  • the object of the invention is to provide an ultrasound sensor of the type described in the introduction, which due to its geometric structure prevents air bubbles from penetrating into the measuring chamber, and which thus enables a permanent and reliable determination of the fluid level.
  • At least one further chamber is arranged at least partially in front of the measuring chamber or at least partially around the measuring chamber, wherein the outer chamber forms the inlet chamber.
  • the chambers are connected to each other.
  • the inlet chamber and the measuring chamber comprise on their side, preferably in each case at a height close to the floor of the housing, an opening to enable the fluid to flow in and out.
  • the opening into the inlet chamber and the opening into the measuring chamber are generally arranged radially as far apart from each other as possible.
  • the air which escapes from the surface out of the fluid can leave the sensor through at least one housing ventilation opening which is arranged in the lid or on an outer side of the inlet chamber at a height close to the lid.
  • the lid is closed at least in the area of the measuring chamber. This prevents fluid from the area surrounding the sensor, which in high probability contains air bubbles, from directly entering the measuring chamber.
  • the pressure compensation in the measuring chamber is created in particular by the fact that on the outer side of the measuring chamber at a height close to the lid, in particular above the maximum measurable fluid level, at least one ventilation opening is included into the chambers outside of the measuring chamber.
  • the fluid level in the measuring chamber can be calculated from the run time ratio of the signal reflected on the surface of the fluid and on a calibration reflector.
  • the calibration reflector in the measuring chamber is preferably arranged below the minimum possible fluid level.
  • the profile of the chambers can differ from chamber to chamber. This depends, among other things, on the geometry of the installation site.
  • the inlet chamber can for example comprise an essentially round profile
  • the measuring chamber can comprise an essentially square profile.
  • the outer sides of the chambers which are arranged between the inlet chamber and the measuring chamber are in particular designed as walls which extend from the floor at the most to a height just below the minimum measurable fluid level of the measuring chamber.
  • the fluid flows through the inlet opening into the inlet chamber.
  • the inlet chamber fills up to the height of the outer side of the next chamber. Further fluid continues to flow through the inlet opening and literally washes over the wall into the next chamber, and so on.
  • the air bubbles rise to the surface of the fluid during this time and disintegrate.
  • the fluid in the chamber in front of the measuring chamber is then advantageously already free of bubbles.
  • the height and length of the outer side of said chamber are measured in such a manner that the fluid retention capacity of this chamber is greater than the retention capacity of the measuring chamber itself.
  • the outer side of the chambers which are arranged between the inlet chamber and the measuring chamber can extend from the floor to the lid.
  • at least one ventilation opening is arranged on the outer side of said chambers, in each case close to the lid.
  • at least one opening to allow the fluid to flow in and out is arranged on each of these outer sides. This opening is located on the outer side at least of the chamber which is closest to the measuring chamber, between the floor and the lid at a height below the minimum measurable fluid level.
  • the outer sides of the chambers which are arranged between the inlet chamber and the measuring chamber are designed as walls which extend from the floor at least up to a height above the maximum measurable fluid level.
  • these outer sides of the chamber comprise at a height close to the floor of the housing one opening each to allow the fluid to flow in and out.
  • the openings are arranged in such a manner that the openings which occur in sequence in the direction of the measuring chamber are positioned as far apart as possible from each other.
  • the walls of the chambers extend between the inlet chamber and the measuring chamber up to the lid. Ventilation openings close to the lid ensure that the necessary pressure compensation is provided into the inlet chamber or into the surrounding area.
  • At least one chamber is arranged at least partially around or in front of the measuring chamber.
  • a separation device is provided between at least two chambers of such a design that the flow direction of the fluid on its journey from one chamber into the next chamber is pre-specified by the respective opening for inflow and outflow.
  • the flow direction of chambers which are arranged in sequence is reversed, and thus the flow journey of the fluid from the inlet opening of the inlet chamber to the measuring chamber is made as long as possible.
  • This separation device can for example in particular be realised with a sensor consisting of concentrically arranged tubes by a separating web which runs radially within one chamber. The same separation effect can also be realised when in each case the outer sides of two successive chambers touch each other, at least at a point preferably above the entire height.
  • a further possibility of influencing the flow speed of the fluid is to attach interim webs within a chamber.
  • the flow speed is then determined in particular by the profile and the attachment location of an interim opening located on the interim web.
  • the interim opening is preferably arranged at a height close to the floor of the housing.
  • the existing separation devices and interim webs must be higher than the maximum possible fluid level.
  • FIG. 1 shows a profile view of an ultrasound sensor with three chambers, without fluid
  • FIG. 2 shows a top view of the sensor in FIG. 1 at level A-A
  • FIG. 3 shows a profile view as in FIG. 1 , with fluid and the surrounding system, not in operation
  • FIG. 4 shows a profile view as in FIG. 1 , with fluid and surrounding system, in operation
  • FIG. 5 shows a profile view as in FIG. 1 , with fluid to a large extent drained
  • FIG. 6 shows a profile view as in FIG. 1 , outer wall of the chamber in front of the measuring chamber up to the lid and the opening at a height below the minimum measurable fluid level
  • FIG. 7 shows a profile view as in FIG. 6 , with the opening at a height close to the floor
  • FIG. 8 shows a top view of the sensor from FIG. 7 at A-A level
  • FIG. 9 shows a top view of a sensor at A-A level, with separation webs and interim webs
  • FIG. 10 shows a top view of a sensor at A-A level, with a separating web and a further separation device
  • FIG. 11 shows a top view of a sensor at A-A level, with square profile and with a separating web in the inlet chamber, wherein chambers are at least partially arranged in front of and around the measuring chamber
  • FIG. 1 and FIG. 2 show a sensor with three chambers ( 4 , 6 , 7 ) without fluid.
  • the profile is round and the individual chambers ( 4 , 6 , 7 ) are formed by concentrically arranged tubes.
  • the outer tube ends with a floor ( 3 ) and a lid ( 2 ), and forms the housing ( 1 ) of the sensor.
  • the middle tube extends from the floor ( 3 ) to the lid ( 2 ) and forms the measuring chamber ( 4 ).
  • the outer chamber also.
  • the inlet chamber ( 7 ), and the measuring chamber ( 4 ) each have on their respective outer side close to the floor ( 3 ) an opening ( 8 ) to enable the engine oil to flow in and out.
  • the inlet chamber ( 7 ) and the measuring chamber ( 4 ) enclose a further chamber ( 6 ), wherein the outer side of said chamber ( 6 ) is formed by the inner side of the inlet chamber ( 7 ) and the inner side of the chamber ( 6 ) is formed by the measuring chamber ( 4 ).
  • the outer side of the chamber ( 6 ) forms a wall which extends from the floor ( 3 ) until just below the minimum level to be measured. Outside the housing ( 1 ), on the floor in the region of the measuring chamber ( 4 ), an ultrasound transmission receiver ( 5 ) is attached.
  • the oil travels through the opening ( 8 ) close to the floor into the inlet chamber ( 7 ).
  • the inlet chamber ( 7 ) fills up to the height of the outer side of the next chamber ( 6 ). If oil continues to flow through the opening ( 8 ), it literally washes over the wall into the next chamber ( 6 ). The air bubbles rise during this time to the surface of the oil and disintegrate. From the chamber ( 6 ), the oil travels through the opening ( 8 ) close to the floor into the measuring chamber ( 4 ).
  • FIG. 3 shows the ratios in the sensor in particular as they occur when the surrounding system, i.e. the engine, is not in operation.
  • the measuring chamber ( 4 ) and in particular, the important lower area of the chamber ( 6 ) which is positioned before it, are bubble-free.
  • the air which escapes from the remaining oil can escape through a housing ventilation opening ( 10 ) in the edge area of the lid ( 2 ).
  • the lid is closed in the area of the measuring chamber ( 4 ), as a result of which oil containing bubbles is prevented from penetrating directly into the measuring chamber ( 4 ) from the engine area.
  • the housing ventilation opening ( 10 ) could then be provided on the outer side of the inlet chamber ( 7 ), preferably close to the lid ( 2 ).
  • FIG. 4 shows the ratios in the sensor which are possible when the engine is in operation.
  • the oil is distributed through the moving parts such as the crankshaft and the connecting rod in the engine.
  • the level in the oil pan, and therefore also in the sensor decreases.
  • the pressure fluctuations in the measuring chamber ( 4 ) which are caused by the changes in level are offset by the ventilation opening ( 11 ) close to the lid on the outer side of the measuring chamber.
  • the ventilation opening ( 11 ) close to the lid on the outer side of the measuring chamber.
  • the chamber ( 6 ) positioned in front of the measuring chamber ( 4 ) preferably only bubble-free oil is present. If oil flows on through the opening ( 8 ) into the inlet chamber ( 7 ), bubble-free oil is pressed into the measuring chamber ( 4 ) from the chamber ( 6 ).
  • the retention capacity of the chamber ( 6 ) is greater due to the dimensioning of the height and length of the wall which surrounds said chamber ( 6 ) than that of the measuring chamber ( 4 ), it is ensured that with all possible changes in level, only bubble-free oil is present in the measuring chamber.
  • the measurement of the run time of the ultrasound signals which are transmitted by the ultrasound transmission receiver and which are reflected on the calibration reflector ( 12 ) or on the surface of the oil present in the measuring chamber ( 4 ) is thus advantageously not falsified at any point in time by air bubbles.
  • the calibration reflector ( 12 ) mentioned is in particular formed on the inner side of the measuring chamber ( 4 ) below the minimum level to be measured.
  • FIG. 5 shows the situation in which the oil is drained from the sensor and from the oil pan of the engine which occurs when oil is changed, for example.
  • the measuring chamber ( 4 ) and in the chamber ( 6 ) positioned in front of it only bubble-free oil is present. After the oil pan, and thus also the sensor, has been re-filled, the measurement of the level can begin immediately.
  • FIG. 6 shows a sensor as in FIG. 1 to 5 , with the difference that here, the outer side of the chamber ( 6 ) extends up to the lid ( 2 ).
  • the oil travels from the inlet chamber ( 7 ) through an opening ( 8 ) into the chamber ( 6 ) at a height just below the minimum fluid level to be measured.
  • the relative position of the openings ( 8 ) in the inlet chamber ( 7 ), the chamber ( 6 ) in front of it and the measuring chamber ( 4 ) is arbitrary with this embodiment in particular.
  • the profile of the openings ( 8 ) and the number of openings ( 8 ) per chamber ( 4 , 6 , 7 ) can vary among each other, and influences the flow speed of the oil in the sensor.
  • the ventilation opening ( 11 ) is arranged on the outer side of the chamber ( 6 ) close to the lid ( 2 ).
  • FIGS. 7 and 8 show a further embodiment of the sensor.
  • the openings ( 8 ) in the outer side of each chamber ( 4 , 6 , 7 ) are respectively arranged close to the floor ( 3 ).
  • This has the advantage that when the oil is changed, possible residues such as oil sludge and fillings are to a large extent also flushed out.
  • the openings ( 8 ) which follow in succession in the direction of the measuring chamber ( 4 ) are positioned as far apart from each other as possible.
  • the journey which the oil has to cover through to the measuring chamber ( 4 ) is with this embodiment of the sensor as long as possible.
  • the oil can however move towards the opening ( 8 ) into the next chamber ( 6 , 7 ) partially in a clockwise direction and partially in an anti-clockwise direction.
  • the time during which the oil lingers in a chamber ( 6 , 7 ) can be prolonged by inserting a separation device ( 9 ), as shown in FIG. 9 .
  • the separation device ( 9 ) in the inlet chamber ( 7 ) lies to the right of the opening ( 8 ).
  • the flow direction into the next chamber ( 6 ) is pre-specified as being in a clockwise direction.
  • the separation device ( 9 ) in the next chamber ( 6 ) lies to the left of the opening ( 8 ) into said chamber ( 6 ). This, in this chamber ( 7 ) the flow direction is pre-specified as being in an anti-clockwise direction.
  • a separation device ( 9 ) can for example be realised by a separating web ( 9 ) which runs within a chamber ( 6 , 7 ) from one wall to the other wall.
  • the separation device ( 9 ) must in particular be higher than the maximum possible oil level.
  • the separation device ( 9 ) extends from the floor ( 3 ) to the lid ( 2 ).
  • the flow speed can also be influenced by the arrangement of at least one interim web ( 14 ) within a chamber ( 6 , 7 ).
  • an interim web ( 14 ) can be permeated by the oil, however.
  • an interim opening ( 13 ) is arranged in the interim web ( 14 ), preferably close to the floor.
  • the number of interim webs ( 14 ) per chamber ( 6 , 7 ) and the profile and number of the interim openings ( 13 ) can vary depending on requirements.
  • two interim webs ( 14 ) are provided in the inlet chamber ( 7 ) and one interim web ( 14 ) is provided in the chamber ( 6 ).
  • the openings ( 8 ) to enable the oil to flow in and out to and from a chamber ( 4 , 6 , 7 ) and the interim openings ( 13 ) are here positioned at one level in particular. This is not absolutely necessary, however.
  • the separation device ( 9 ) in the inlet chamber ( 7 ) is formed by means of the fact that the outer sides of the successive inlet chambers ( 7 ) and the chambers ( 6 ) touch each other at least one point, here via a small part of the circumference.
  • a separating web ( 9 ) is provided to the left next to the opening ( 8 ) into this chamber ( 6 ).
  • the opening ( 8 ) into the chamber ( 6 ) does not have to lie at the same level as the opening ( 8 ) into the inlet chamber ( 7 ) or into the measuring chamber ( 4 ).
  • FIG. 11 shows a top view onto a sensor with a square profile.
  • the inlet chamber ( 7 ) is arranged around the measuring chamber ( 4 ), and the chambers ( 6 ) are arranged at least partially in front of or around the measuring chamber ( 4 ).
  • the multi-chamber ultrasound sensor described guarantees a slowdown of the oil in the sensor and a bubble-free measuring chamber.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
US12/309,432 2006-07-18 2007-07-18 Multichamber ultrasonic sensor for determining a liquid level Abandoned US20090301187A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102006033592 2006-07-18
DE102006033592.9 2006-07-18
DE102006039872.6 2006-08-25
DE102006039872 2006-08-25
PCT/DE2007/001287 WO2008009277A1 (de) 2006-07-18 2007-07-18 Mehrkammerultraschallsensor zur bestimmung eines flüssigkeitspegels

Related Parent Applications (1)

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PCT/DE2007/001287 A-371-Of-International WO2008009277A1 (de) 2006-07-18 2007-07-18 Mehrkammerultraschallsensor zur bestimmung eines flüssigkeitspegels

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US13/366,716 Active 2028-06-18 US9121745B2 (en) 2006-07-18 2012-02-06 Multichamber ultrasonic sensor for determining a liquid level

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US (2) US20090301187A1 (zh)
EP (1) EP2041530B1 (zh)
JP (1) JP5024686B2 (zh)
KR (1) KR101377623B1 (zh)
CN (1) CN101490515B (zh)
DE (1) DE112007001418A5 (zh)
WO (1) WO2008009277A1 (zh)

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US20110226212A1 (en) * 2010-03-16 2011-09-22 Hella Kgaa Hueck & Co. Device for measuring foamed media
US20110228641A1 (en) * 2010-03-16 2011-09-22 Hella Kgaa Hueck & Co. Device for determining a filling level
US20120234091A1 (en) * 2011-01-14 2012-09-20 Hella Kgaa Hueck & Co. Device for ascertaining a fill level of a medium
US20150377684A1 (en) * 2014-06-27 2015-12-31 Hella Kgaa Hueck & Co. Device for measuring a filling level of a liquid in a container with an ultrasound sensor
US20180087951A1 (en) * 2016-09-27 2018-03-29 Hella Kgaa Hueck & Co. Device for measuring a fill level of a liquid in a container
US10197431B2 (en) * 2016-03-30 2019-02-05 Hella Kgaa Hueck & Co. Device for measuring the filling level of a liquid
KR20200093024A (ko) * 2017-12-26 2020-08-04 동구안 쳉양 일렉트로닉 메커니컬 컴퍼니, 리미티드 초음파 검출기 및 검출 장치
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JP5814886B2 (ja) 2012-08-13 2015-11-17 株式会社Adeka 液体用容器及びこれを用いた液面レベルの測定方法
DE102013016164B4 (de) * 2013-09-30 2023-06-15 HELLA GmbH & Co. KGaA Vorrichtung zur Bestimmung eines Füllstands sowie Motor und Kraftfahrzeug mit einer derartigen Vorrichtung
US10012121B2 (en) * 2014-05-20 2018-07-03 Ssi Technologies, Inc. Reduction of aeration interference via tortuous path and sensor boot
DE102014009610A1 (de) 2014-06-27 2015-12-31 Hella Kgaa Hueck & Co. Vorrichtung zur Messung eines Füllstands
DE102015101406A1 (de) * 2015-01-30 2016-08-04 Systronik Elektronik Und Systemtechnik Gmbh Messvorrichtung zur Messung eines Volumenstroms einer Flüssigkeit
JP6404792B2 (ja) * 2015-09-11 2018-10-17 東芝メモリ株式会社 薬液タンク
DE102015224932B3 (de) * 2015-12-11 2017-01-26 Continental Automotive Gmbh Ultraschallsensor zur Bestimmung eines Flüssigkeitspegels
DE102015225123B3 (de) * 2015-12-14 2017-03-02 Continental Automotive Gmbh Vorrichtung zur Füllstandsmessung eines Fluids in einem Behältnis für ein Kraftfahrzeug
DE102016217926A1 (de) * 2016-09-19 2018-03-22 Continental Automotive Gmbh Füllstandsmessvorrichtung mit einem Messrohr und Abdeckvorrichtung für die Füllstandsmessvorrichtung
US10801877B2 (en) * 2017-12-01 2020-10-13 The Boeing Company Ultrasonic fluid measurement calibration probe
US11965768B2 (en) 2018-04-25 2024-04-23 Shaw Development, Llc Device with aeration mitigation for improved measurement of fluids
CN112141647A (zh) * 2019-06-28 2020-12-29 黄智渊 桶装物料的配送系统及其操作方法
DE102020101854A1 (de) 2020-01-15 2021-07-15 HELLA GmbH & Co. KGaA Vorrichtung zum Messen eines Füllstands einer Flüssigkeit
EP3878654B1 (de) * 2020-03-11 2022-03-30 Heidelberger Druckmaschinen AG Vorrichtung zum messen des pegels einer schaumbildenden tinte für eine tintendruckmaschine
CN111947743A (zh) * 2020-08-17 2020-11-17 苏州化工仪表有限公司 一种改进型浮标液位计
CN113607809B (zh) * 2021-07-28 2024-04-12 东风商用车有限公司 一种防气泡干扰的车用尿素溶液品质检测装置
CN114810573B (zh) * 2022-04-29 2023-07-21 扬州大学 一种用于水泵吸气率测定装置

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EP2041530A1 (de) 2009-04-01
CN101490515A (zh) 2009-07-22
US20120152015A1 (en) 2012-06-21
CN101490515B (zh) 2011-08-03
EP2041530B1 (de) 2017-10-25
WO2008009277A1 (de) 2008-01-24
US9121745B2 (en) 2015-09-01
DE112007001418A5 (de) 2009-04-02

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