WO2015124339A1 - Capteur de niveau de remplissage à système de contrôle d'électrode - Google Patents

Capteur de niveau de remplissage à système de contrôle d'électrode Download PDF

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Publication number
WO2015124339A1
WO2015124339A1 PCT/EP2015/050782 EP2015050782W WO2015124339A1 WO 2015124339 A1 WO2015124339 A1 WO 2015124339A1 EP 2015050782 W EP2015050782 W EP 2015050782W WO 2015124339 A1 WO2015124339 A1 WO 2015124339A1
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WO
WIPO (PCT)
Prior art keywords
electrode
inner conductor
measuring device
level measuring
cavity
Prior art date
Application number
PCT/EP2015/050782
Other languages
German (de)
English (en)
Inventor
Josef Fehrenbach
Original Assignee
Vega Grieshaber Kg
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 Vega Grieshaber Kg filed Critical Vega Grieshaber Kg
Publication of WO2015124339A1 publication Critical patent/WO2015124339A1/fr

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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
    • G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
    • 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
    • G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level

Definitions

  • the present invention relates to a level gauge according to the preamble of claim 1, a method for monitoring the function of an electrode of a level gauge and a method for the combined monitoring of the function of an electrode of a level gauge and for determining the temperature of the electrode of the level gauge.
  • Level gauges are used to measure the level of liquids and bulk solids in containers. The level of even a tank can often be capacitively ge ⁇ will measure, namely when for example, the container ⁇ walls are made of metal, into which projects a likewise metallic level sensor. The capacity is measured between the vessel wall and the level probe. Arranged between these two elements, liquid, or arranged Zvi ⁇ rule these two elements forms the bulk dielectric. From the value of the so determined capacity can then be closed on the filling height of the container.
  • the containers have a very high height, and thus fill level probes are used, which are very long.
  • the level probe itself is often a mostly metallic rod, which may have a length of up to ten meters and more.
  • a problem that occurs with level probe measurement is possible electrode flexing, a short circuit between the electrode and the metallic container wall or an electrode break. If, for example, the capacitance between the vessel wall and the electrode is determined with a bent electrode, considerable errors can occur when determining the level. Especially with a lead fracture or a short circuit between the electrode and metallic Be ⁇ vessel wall to determine the filling level is no longer possible.
  • Object of the present invention is therefore to provide a Vorrich ⁇ device, with which the functionality of the electrode of a level gauge can be monitored, and to provide a method for monitoring the function of an electrode of a level gauge.
  • a device and a method detect ⁇ with which additionally the Temperature of the bulk ⁇ good or the liquid can be determined. At the same time, possible damage to the electrode should also be monitored.
  • the inventive level measuring device has an electrode ⁇ arrangement, in which the electrode has an electrically lei ⁇ tende lateral surface which encloses a cavity axially ⁇ and limits the cavity, and a circumferentially connected to the lateral surface, the cavity delimiting, electrically conductive electrode tip , The cavity therefore has a rectilinear axis extending from the lateral surface of the
  • the outer surface of the electrode may also radially surround the axis in a specific embodiment.
  • a connection end Opposite the electrode tip, a connection end, which likewise delimits the cavity, an electrode flange is arranged.
  • the cavity is defined by the shell surface, the tip and by the terminal end of the electrode.
  • the electrode also has a
  • Electrode inner conductor and is inventively ge ⁇ indicates that the electrode inner conductor a niesab ⁇ section with a first and a second end which engages in the cavity between the electrode tip and the at ⁇ circuit end in a straight line and spaced from the electrically conducting shell surface, along the electrically conductive jacket ⁇ surface extending, is arranged.
  • the electrode advantageously both between the electrode tip and the lateral surface, as also closed at the Elect ⁇ clear end.
  • the line section is tightened between the first and second ends such that the
  • Electrode inner conductor breaks off when the electrode is bent. Such an arrangement is suitable for detecting an electrode fracture or an electrode bending and thus for monitoring the function of the electrode of a Medstandmessge ⁇ etzs.
  • the simplest and most important way to monitor the function of the electrode is the detection of a tearing of the electrode inner conductor as a result of breakage or bending of the electrode.
  • the interruption of the current flow through the electrode inner conductor signals a probe damage .
  • Another monitoring option can be done by ⁇ in following the method described for the determination of the resistance:
  • the electrode which usually has a very small diameter, vergli ⁇ chen, ver ⁇ bent, touches the inner electrode, the rule in the cavity between ⁇ rule the electrode tip and the terminal end straight and spaced from the electrically conductive Mantelflä ⁇ che runs, the electrically conductive lateral surface and thus provides an additional electrical contact between the electrode inner conductor and the electrically conductive Mantelflä ⁇ che ago.
  • the electrode which usually has a very small diameter, vergli ⁇ chen, ver ⁇ bent, touches the inner electrode, the rule in the cavity between ⁇ rule the electrode tip and the terminal end straight and spaced from the electrically conductive Mantelflä ⁇ che runs, the electrically conductive lateral surface and thus provides an additional electrical contact between the electrode inner conductor and the electrically conductive Mantelflä ⁇ che ago.
  • the electrode which usually has a very small diameter, vergli ⁇ chen, ver ⁇ bent, touches the inner electrode, the rule in the cavity between ⁇ rule the electrode tip and the terminal end straight and spaced
  • Electrode arranged portion of the electrode inner conductor have no insulation.
  • the tempera ture ⁇ be determined, on the other hand monitors whether the electrode is still in order, Wider an allowable range can be ⁇ was defined and monitored by a comparator.
  • the first end of the line section is advantageously attached to a first fixing element, wherein the first Fi ⁇ xierelement disposed in the cavity and fixed to the electrode.
  • the electrical deninnenleiter between the first fixing member and the bounding the cavity terminal end of the electrode so as to span ⁇ nen that it rectilinearly in the cavity between the electrode tip and the terminal end and spaced from the electrically conductive jacket surface, along the electrically conductive shell surface extends, provided that the electrode is rectilinear, that is to say surrounds the cavity axially.
  • the electrode inner conductor is advantageously arranged stretched between the first and a second fixing element, wherein the second end of the line section at the second
  • Fixing element is arranged spaced from the electrode held. In this way, a linearly extending in the cavity within the electrode line section, which is from the electrically conductive jacket surface, advantageously coaxially spaced.
  • the second fixing element is advantageously formed as Iso ⁇ lations thank entry in or at the terminal end and the electrode inner conductor is guided through the insulation bushing .
  • Such an insulating bushing guarantees the spacing of the electrode inner conductor to the electrode and also has the advantage that the electrode inner conductor outside the electrode, that is outside the cavity of the electrode can be attached, wherein the already fixed to the first Fixie ⁇ relement electrode inner conductor by the Iso ⁇ lations notebook entry be passed and outside the electrode can be fixed so that it is arranged in the cavity spanned.
  • the electrode inner conductor ⁇ is formed as a resistance wire. In a prohibit the electrode supply is then established an electrical contact between the resistance wire and the electrode sheath, thereby determining a sudden reduction of the measured reflection ⁇ stands between the electrode and the arranged outside the electrode end of the electrode inner conductor ⁇ the can, indicating a a bent electrode or an electrode break.
  • the electrode inner conductor is formed elastically or connected to a, preferably electrically conductive, spring element so that the line section is stretched.
  • the elasticity of the electrode inner conductor or the Fe ⁇ derelement thus ensure that the line section remains tense in any situation. Since an electrode can often be six to ten meters long, thermal expansions at different thermal expansion coefficients between the electrode inner conductor and the electrode can be compensated in this way. For example, the electrode inner conductor can not tear off when the electrode is in a hot liquid is dipped and expands more than the electrode inner conductor.
  • the lateral surface of the electrode can be formed as a lateral surface of a cylinder or a truncated cone.
  • the elec ⁇ rodenspitze can be formed, for example, as the top surface of a Zy ⁇ Linders or a prism or as a top surface of a cone ⁇ stump or truncated pyramid or as a tip of a cone or a pyramid.
  • the electrode tip is preferably formed electrically fully conductive.
  • the circumferential surface of the electrode can be made of metal, before ⁇ preferably it is made of stainless steel. It may additionally have an anti-corrosion coating to protect the electrode from aggressive environmental conditions, for example from corrosive
  • the electrode can also have completely or partially an insulation layer in order, for example, to allow the capacitive measurement of the fill level of electrically conductive liquids.
  • the first fixing element is as an electrical contact between the electrode and the first fixing element
  • Electrode inner conductor formed wherein the electrical Kon ⁇ tact is preferably formed as a welding point or as a solder joint between the electrode and the electrode inner conductor.
  • a fixing element effects the electrical contact between the electrode and one end of the electrode inner conductor.
  • the electrode inner conductor may be electrically connected to a temperature sensor disposed in the cavity. In this way, the internal temperature of the electrode can be determined.
  • the first fixing element itself can also be designed as a temperature sensor or as an electrical temperature sensor connection of a temperature sensor.
  • soldering or welding point can already form a thermocouple between an electrically conductive one
  • Electrode of a first metal and an electrode inside ⁇ conductor of another metal is advantageous ⁇ way legally electrically connected to the electrically conductive electrode and / or the inter electrode conductors to allow the same ⁇ simultaneous measurement of temperature and electrodes texture.
  • the temperature sensor may be, for example, a normalized, temperature-dependent resistor having two, three or four electrical connection elements. With such an arrangement, for example, only the temperature can be determined by measuring the resistance, as well as the nature of the electrode.
  • the temperature sensor can for example be formed as a platinum sensor or it can be a bolometer or a thermo ⁇ element or a carbon resistor. Other tempera ⁇ tursensoren can be used.
  • the resistance wire can even form the temperature sensor itself. He is then preferably a temperature-dependent Wi ⁇ derstandsdraht. He can then, for example, in a range between a minimum temperature and a maximum temperature Tempe ⁇ values between a minimum resistance and a ma assume maximum resistance. If it takes values outside this resistance range, this indicates a problem with the electrode. If, for example, the electrode is broken and the resistance wire is torn, suddenly a very high resistance is detected. An evaluation unit can then be used to indicate that the electrode has broken. Is ande ⁇ hand, the electrode is bent, so that the resistance wire contacting the outer surface of the electrode is detected to a low resistance and it can be given off via the evaluation unit, that the electrode is bent. If the ge ⁇ -measured resistance within the allowable range, the temperature of the probe may be outputted via the evaluation unit.
  • a method for monitoring the function of an electrode of a level gauge can be passed through ⁇ , wherein the electrical resistance between the deninnenleiter and the electrode and / or the resistance of the electrodes and the inner conductor of the electrode is determined.
  • both the function of the electrode of a filling level measuring device ⁇ can be monitored by determining the resistance between the electrode inner conductor and the electrode at one of the white ⁇ ter above-described arrangements, comprising a temperature sensor, and the temperature of the
  • Electrode of the level measuring device are determined beispiels- example characterized in that either the specific resistance is determined by the Elektrodeninnenlei ⁇ ter, the electrode and, disposed between the Elektrodeninnenlei ⁇ ter and the electrode temperature sensor, or by the fact that the resistance of the electrode inner conductor and the electrode and the thermo-voltage between the electrode inner conductor and the electrode is determined. If the determined resistance exceeds a predetermined maximum value or when the specific resistance below a pre ⁇ given minimum value, and / or if the electrical deninnenleiter (14) is pulled down, an optical or acoustic signaling output member may be provided, which reports or indicates in that the electrode is defective.
  • a monitoring element and / or a monitoring ⁇ function can be provided which / detects a sudden change in the specific resistance, and reports in the case of such a detected event on the output element and / or indicates that the electrode is defective.
  • the monitoring function and / or the monitoring element can be designed so that the resistance curve is measured, recorded and stored as a function of time. The person skilled in many types of configuration of such monitoring ⁇ functions and / or monitoring elements are known.
  • NAMES ⁇ gen used in the following description, such as “top”, “bottom”, “left”, “right” and the like, re- late to embodiments and also are in no Wei ⁇ se to be limiting, not when they relate to ⁇ preferred embodiments.
  • Figure 1 is a arranged in a container level measuring device for capacitive (or by means of TDR) mood of the level
  • 2 shows an example of a lower portion of the electrode of a level gauge with a temperature sensor ⁇
  • Figure 3 shows another example of a lower part of the
  • Electrode of a level gauge with a temperature sensor Electrode of a level gauge with a temperature sensor.
  • FIG. 1 shows a fill level measuring device 1 which is arranged in a container 2.
  • a Messme ⁇ medium 3 here a liquid 3, which is filled in the container 2 to a level 4.
  • the level measuring device 1 has an electrode 6, with an electrode tip 8, as ⁇ as a electrode tip 8 opposite arranged terminal end 10.
  • the terminal end 10 is electrically conductively connected to the Elect ⁇ rode.
  • the electrode 6 further includes an envelope surface 12 that is of metallic construction, in the present case ⁇ game and may be provided container wall side at ⁇ play, with an anti-corrosion coating to prevent corrosion of the electrode 6 in the liquid.
  • an electrode with an artificial coating is usually used for determining the fill level.
  • An electrode inner conductor 14, which in the present example is designed as a resistance wire, is at its lower end in the vicinity of
  • Electrode tip 8 attached to a first fixing member 16 and extends through the cavity 18 between the Ers ⁇ th fixing element 16 and a second fixing 20, wel ⁇ Ches is formed at the connection end 10, by a recorded in the level measuring device 1 first insulation bushing 22 to a Evaluation unit 24, in which the temperature of
  • Electrode 6 can be determined, and the electrode 6 can be monitored for electrode breakage.
  • a line section 26 is defined, which is coaxial with the lateral surface 12 of the Elektro ⁇ de 6 is formed in the present example as an inner conductor of the electrode 6 and extends through the cavity 18.
  • the line section 26 may be formed in ⁇ example, as a simple electrical conductor. In this case, only monitoring the electrode 6 for electrode breakage is possible. If the line section 26 breaks, the electrode 6 is broken.
  • a further advantageous embodiment is that the fixing element (20) is designed as a predetermined breaking point and the tearing of the wire at this point very safe to detect a Son ⁇ dembruch allowed.
  • a further advantageous embodiment is that the line section 26 is formed as a temperature-dependent resistance wire, so that both the temperature of the electrode 6, as well as a break or malfunction of the electrode 6 can be determined with the line section 26.
  • the electrode 6 fixedly connected to a process connection 29 via a second insulation bushing 30 is replaced by a container opening 28 is guided in the interior of the container 2.
  • the process connection 29 can be in the form of a screw-in thread, egg ⁇ nes flange or other connection type, so that the electrode 6 is fixed locally tight beab- standet to the wall of the container 2 in the container 2 is angeord ⁇ net. Characterized a capacitive measurement of the Grestandhö ⁇ he between the electrode 6 and the metallic container 2 is made possible.
  • the evaluation unit 24 is connected via an electrical connection 6 'to the electrode 6 and via an electrical connection 14' to the electrode inner conductor 14.
  • the filling level is measured capacitively with a filling level evaluation unit 31 in that it is electrically connected to the electrode 6 via the electrical connection 6 'and to the process connection and thus to the container via an electrical connection 29'.
  • liquid 3 is an electrically non-conductive liquid, it forms the dielectric between the electrode 6 and the container 2.
  • electrodes (6) are used whose outer surface facing the inner wall of the container 2 is electrically insulated.
  • the part of the insulating layer extending up to the level 4 forms the dielectric determining the measured value between the electrode 6 and the container 2.
  • the lead portion 26 of the electrode inner conductor 14, which is designed as a resistance wire is uninsulated in the present case ⁇ play, as well as the cavity facing surface 18 of the electrode 6.
  • the lead portion 26 can also be a tempering ⁇ raturcomber resistance wire, of course, such that also the temperature of the liquid level probe may be measured.
  • the lead portion 26 is clamped between the first fixing member 16 and the second fixing element 20 is arranged in the hollow space ⁇ 18th
  • Electrode 6 and thus creates an additional electrical contact, which has an abrupt change in the resistance between the electrode 6 and the electrode inner conductor 14 result. This can be measured with the evaluation unit 24.
  • the evaluation unit 24 can detect that the electrode is defective.
  • Figure 2 shows another example of a combined
  • Electrode breakage monitoring and temperature measurement Shown is the lower end of the electrode 6 of the level measuring device 1.
  • the line section 26 extends coaxially to the electrode jacket 12 and is connected at its lower end with a fixing element 16, which is simultaneously an electrical contact of a tempera ⁇ ture sensor 32.
  • a second contact (not constitute provided ⁇ ) of the temperature sensor 32 is ze with the Elektrodenspit- 8, which is electrically conductive in the present example, are electrically connected.
  • the temperature sensor 32 is simultaneously thermal on the electrode tip 8 via a heat conduction connection (not shown) with the electrode tip 8 connected. In this way, the heat input of the liquid ⁇ speed 3 via the electrode tip 8 is passed directly to the temperature ⁇ sensor 32.
  • the temperature sensor 32 may be platinum temperature sensor such as a tin-Pla ⁇ temperature sensor, such as a PT100 or PT1000, a.
  • Figure 3 shows a third example of a combined Elect ⁇ roden monitoring and temperature measurement. Shown again is the lower end of the electrode 6 of the level measuring device 1.
  • the electrode tip 8 is, as in the example of Figure 2, formed as a top surface of a cylindrical electrode 6, wherein the lateral surface of the cylinder is the electrode sheath 12.
  • a temperature sensor 33 is fastened ⁇ be, which has four electrical connection elements in this case, wherein one of the four connection elements, as in the example in Figure 2, (not shown) with the
  • Electrode tip 8 is conductively connected. Another on ⁇ closing element is designed as a first fixing element 16.
  • An electrically conductive Fe ⁇ derelement 34 is attached to the first fixing element 16 and electrically connected to the temperature sensor 33.
  • the electrically conductive spring element 34 is located on the first fixing element 16 opposite
  • a third and a fourth electrical connection element 36a, 36b complete the four connection elements of the temperature sensor 33.
  • a true four-point measurement can be carried out. For example, between the two electrical Raele ⁇ elements 36a, 36b, a constant current through the temperature sensor 33 are passed, while between the first fixing member 16 and the electrode tip 8, for example, the falling voltage is measured.
  • the electrical Anschlus ⁇ simplantation 36a, 36b are advantageously isolated in order to avoid that they can come electrically in contact with the electrode. 6
  • the electrically conductive spring member 34 causes on the one hand, that the resistance of the temperature sensor 33 between the ERS th fixing member 16 and the electrode tip 8 determines who can ⁇ the other hand, causes the spring element 34, that the conduit section 26 is always tensioned.
  • differences ⁇ de can be compensated by the spring member 34 26 is in thermal expansion coefficient between the Elect ⁇ rode 6 and the conduit portion.
  • a capaci ⁇ tive measurement for detecting a lead fracture or of an electrode bend with the inventive device can play as well, instead of a resistance measurement made or it can be performed a combined measurement, wherein the determined, for example by means of capacitance measurements, whether the electrode is bent or is broken and with Help of resistance measurements is determined which tempera ⁇ tur prevails at the electrode tip.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un appareil de mesure de niveau de remplissage doté d'un agencement d'électrode permettant d'une part de surveiller une éventuelle rupture de l'électrode et d'autre part d'effectuer une mesure de température. L'invention concerne un appareil de mesure de niveau de remplissage doté d'un agencement d'électrode présentant une électrode, laquelle comporte une surface extérieure électroconductrice entourant axialement et délimitant un espace creux, une pointe d'électrode, de préférence électroconductrice, reliée en périphérie à la surface extérieure et délimitant l'espace creux, ainsi qu'une extrémité de raccordement disposée à l'opposé de la pointe d'électrode et délimitant l'espace creux, ladite électrode présentant à l'intérieur un conducteur intérieur d'électrode, qui comporte une partie ligne, ayant une première et une seconde extrémité, et est disposé dans l'espace creux entre la pointe de l'électrode et l'extrémité de raccordement, de manière à s'étendre linéairement et à distance de la surface extérieure électroconductrice, le long de la surface extérieure électroconductrice.
PCT/EP2015/050782 2014-02-18 2015-01-16 Capteur de niveau de remplissage à système de contrôle d'électrode WO2015124339A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014102054.5 2014-02-18
DE102014102054.5A DE102014102054A1 (de) 2014-02-18 2014-02-18 Füllstandsensor mit Elektrodenüberwachung

Publications (1)

Publication Number Publication Date
WO2015124339A1 true WO2015124339A1 (fr) 2015-08-27

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WO (1) WO2015124339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106989662A (zh) * 2017-05-09 2017-07-28 天津理工大学 一种大量程电容型波高传感器

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Publication number Priority date Publication date Assignee Title
JP6947764B2 (ja) * 2019-02-12 2021-10-13 矢崎総業株式会社 液位検出装置ユニット
CN112067080B (zh) * 2020-07-13 2023-04-28 重庆材料研究院有限公司 高温高压环境下实时连续测量液位的方法

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US2387365A (en) * 1944-01-13 1945-10-23 Thomson E Craig System of tubular electrodes
EP1992921A1 (fr) * 2007-05-16 2008-11-19 FAFNIR GmbH Procédé et dispositif destiné à la détection de l'état de remplissage
EP2012098A1 (fr) * 2007-07-03 2009-01-07 Sick Ag Capteur fonctionnant selon le principe TDR doté d'une sonde coaxiale et procédé de fabrication correspondant
JP3185170U (ja) * 2012-12-10 2013-08-01 ジーイー−ヒタチ・ニュークリア・エナジー・アメリカズ・エルエルシー 時間分域反射率測定（ｔｄｒ）を使用して液位を遠隔測定するシステムおよび方法

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DE3029352C2 (de) * 1980-08-01 1982-12-23 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Kapazitive Füllstandsmeßanordnung mit einer stabförmigen Sonde für die Messung des Füllstandes in einem Behälter
DE19728443C1 (de) * 1997-07-03 1999-02-25 Tuchenhagen Gmbh Überwachungselektrode für die Füllstandsanzeige in Behältern zur Bevorratung elektrisch leitender Flüssigkeiten
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2387365A (en) * 1944-01-13 1945-10-23 Thomson E Craig System of tubular electrodes
EP1992921A1 (fr) * 2007-05-16 2008-11-19 FAFNIR GmbH Procédé et dispositif destiné à la détection de l'état de remplissage
EP2012098A1 (fr) * 2007-07-03 2009-01-07 Sick Ag Capteur fonctionnant selon le principe TDR doté d'une sonde coaxiale et procédé de fabrication correspondant
JP3185170U (ja) * 2012-12-10 2013-08-01 ジーイー−ヒタチ・ニュークリア・エナジー・アメリカズ・エルエルシー 時間分域反射率測定（ｔｄｒ）を使用して液位を遠隔測定するシステムおよび方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106989662A (zh) * 2017-05-09 2017-07-28 天津理工大学 一种大量程电容型波高传感器

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