WO2005038414A1 - Procede et appareil destines a isoler un indicateur du niveau radar - Google Patents

Procede et appareil destines a isoler un indicateur du niveau radar Download PDF

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Publication number
WO2005038414A1
WO2005038414A1 PCT/SE2004/001510 SE2004001510W WO2005038414A1 WO 2005038414 A1 WO2005038414 A1 WO 2005038414A1 SE 2004001510 W SE2004001510 W SE 2004001510W WO 2005038414 A1 WO2005038414 A1 WO 2005038414A1
Authority
WO
WIPO (PCT)
Prior art keywords
wave guide
antenna
guide member
level gauge
dielectric barrier
Prior art date
Application number
PCT/SE2004/001510
Other languages
English (en)
Inventor
Kurt Olov Edvardsson
Magnus Ohlsson
Anders Jirskog
Original Assignee
Saab Rosemount Tank Radar Ab
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
Priority claimed from US10/687,975 external-priority patent/US6950055B2/en
Priority claimed from SE0302772A external-priority patent/SE0302772D0/xx
Application filed by Saab Rosemount Tank Radar Ab filed Critical Saab Rosemount Tank Radar Ab
Priority to DE112004001988T priority Critical patent/DE112004001988T5/de
Publication of WO2005038414A1 publication Critical patent/WO2005038414A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
    • 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
    • G01F23/284—Electromagnetic waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/528—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the re-radiation of a support structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H01Q13/0266—Waveguide horns provided with a flange or a choke

Definitions

  • the present invention relates to level measurement in industrial processes, wherein the invention is used for the measurement of a level of a product in a storage tank of the type used in industrial applications and where the level measurement is performed by use of a microwave level gauge. More specifically, the invention relates to the connection of the electronics of a radar level gauge to an antenna mounted at a wall of the tank.
  • the radar level gauge cabling and its connection to ground are regulated by different installation rules and by reasons of security. Insulation of conductors going into hazardous areas (where inflammable compounds are stored) is a related issue. A way of insulation to ground and items in the tank well suited for maintaining good function of radar sensors is the main object of the invention.
  • Ex-regulations (Ex. abbreviation of: Regulations for Explosions Safety) have grounding requirements and also requirements for insulation to conductors, which are located in areas corresponding to "zone 0" which typically is inside a tank. Ex- regulations are many times not quite clearly formulated when it comes to practical cases but may in some respects appear as subject to negotiations. Insulation to ground for intrinsically safe circuits is in many cases specified as 500 V AC rated voltage, while insulation to parts in zone 0 (inside the tank) is more complicated. Typically one infallible or three good insulation components are to be used in the last case with some more or less obvious requirements for the good ones.
  • grounding under different requirements is that the electronics shall be made to be well insulated from the local ground and then if required be connected in a suitable way different in different cases.
  • the galvanic concept "grounding" may be adequate, but due to capacitance in the cabling (in the order of 100 nF/km) all but very low frequency signals will have a rather complicated coupling to ground, the result of which is not always easy to predict.
  • One way to obtain insulation as seen from the field cabling is to use an AC power supply and an AC data transmission where transformers can be used for providing the gauge with both power and data communication but maintaining good DC insulation.
  • the microwave circuit in that case can be locally grounded, or whatever, while maintaining good external insulation.
  • Sensors which by their nature work, while they are enclosed in metal (temperature sensor, pressure sensor and other) may have an internal (and thus well protected) electrical insulation common for all components in the electronic unit.
  • a standard SMA-coaxial connector 1 is used as a feeding probe 2 in a wave guide 3 at for instance 10 GHz.
  • a dielectric washer 4 under the connector forms a capacitor and by a conical recess 5 the distance between the metal parts is increased to withstand applicable test voltage (such as 500 VAC or 1500 VAC).
  • the washer 4 must be thin to limit VSWR (Voltage Standing Wave Ratio) and due to the limited capacitance this solution is best for medium or high microwave frequencies (>5 GHz).
  • VSWR Voltage Standing Wave Ratio
  • a washer too thick as compared to the wavelength may create microwave matching problem and this especially at a frequency like 25 GHz (wavelength 8mm).
  • an insulated coaxial connector can be located and insulated by capacitors as components.
  • Tripled capacitors can be used to fulfil intrinsically safety requirements for DC insulation while maintaining microwave coupling for frequencies in the lower microwave range
  • a radar level gauge using microwaves for measuring a level of a surface of a product in a tank comprising an antenna for transmitting microwaves to the surface and receiving microwaves reflected by the surface, a measurement circuitry feeding said antenna through a hollow wave guide and said wave guide including at least an antenna wave guide member, at one end couplable to the antenna and at its other end having an opening in an intersection across the wave guide, wherein the radar level gauge further comprises: a dielectric barrier extending along said intersection across the opening of said antenna wave guide member for non-conductively separating said antenna wave guide member from said measurement circuitry, said dielectric barrier having a first side facing the wave guide in a direction towards the antenna wave guide member and said dielectric barrier having a second side facing a direction substantially away from said antenna wave guide member.
  • the intersection of the antenna waveguide member is preferably included in an intersectional plane.
  • the invention relates to a radar level gauge, where a wave guide is used for the antenna feeding and more specific systems where the wave guide from a certain point must be non-conductively separated from the electronic and microwave circuits, such as a measurement circuitry, of the radar level gauge with a dielectric material of a predetermined thickness (such as 0.5 mm) or of a predetermined dielectric strength. Preferably this non-conductive separation is done close to the measurement circuitry of the radar level gauge.
  • Another important and advantageous implementation is the location of the dielectric barrier at a wave guide joint enabling the measurement circuitry to be removed for exchange etc.
  • the wave guide joint is robust as compared to a corresponding coaxial sealing, well suited for field service and easier to fit with an insulating dielectric barrier according to the invention.
  • wave guide is used here for an essentially cylindrical (in the broadest meaning of the term cylinder) pipe for microwave transmission, where the wave guide is filled with air or a solid dielectric material, which may be different along the wave guide.
  • the cross section of the wave guide can be different, such as circular, rectangular or other with a ridged rectangular cross section as one of well-known examples of more complicated cross sections.
  • hollow wave guide is used to distinguish the described wave guides from other wave guide structures.
  • non-conductive is used in the meaning that two conductive materials are separated and insulated from each other in respect of DC current and low frequency AC currents, at least for a predetermined AC rated voltage. This is closely related to prescribed test voltages in electrical installations (such as 1500 VAC to ground) or in Ex- rules (such as 500 VAC to ground)
  • a joint is a practical and important detail in the wave guide, which is a special detail for the level gauging application.
  • one part of the wave guide is a part of the tank sealing, which is critical at high pressure, corrosive or dangerous material in the tank etc. It is also necessary to be able to exchange electronic units of the radar level gauge easily under field conditions, whereby a separable joint is advantageous.
  • Fig. 1 shows a feeding of a wave guide of a radar level gauge in a prior art applicstion.
  • Fig. 2 schematically shows an example of a radar level gauging system for determining the level of the surface of a product in a tank.
  • Fig. 3 schematically shows a dielectric barrier in a wave guide of a radar level gauge according to one aspect of the invention.
  • Fig. 4 shows another embodiment of the device in fig. 3.
  • Fig. 5 shows a further embodiment of the device in fig. 3.
  • Fig. 6 shows a the dielectric barrier in a wave guide joint.
  • Fig. 7 shows some alternative embodiments of the opening of the antenna wave guide member.
  • Fig. 8 shows a further embodiment of the shape of a dielectric barrier inserted in a wave guide joint.
  • Fig. 9 illustrates an embodiment where a portion of a wall of the enclosure of the measurement circuitry functions as the dielectric barrier.
  • Fig. 10 illustrates an embodiment where the printed circuit board constitutes as the dielectric barrier.
  • Fig. 11 shows an embodiment where a joint has a sealing between the insulation barrier and the antenna wave guide member.
  • Fig. 12 illustrates an embodiment which is an alternative to the embodiments corresponding to figures 4 or 5.
  • a tank 11 is used for storing a product 12.
  • the product may be such as oil, refined products, chemicals and liquid gas, or may be a material in powder form.
  • a radar 13 is attached to the roof 14 of the tank 11.
  • a microwave beam is transmitted from the radar via an antenna 15 at the interior of the tank.
  • the transmitted beam is reflected from the surface 16 of the product and is received by the antenna 15.
  • the microwave may be transmitted from the antenna as a free radiated beam or via a wave guide (not shown), which communicates with the product.
  • the radar level gauge as shown in fig. 2 is only used as one example.
  • FIG. 3 A preferred embodiment of the present invention is shown in figure 3, representing part of a cross section of a radar level gauge unit 20.
  • 21 denotes antenna wave guide member which can be coupled to the antenna.
  • the enclosure (shown partly) around the measurement circuitry 23 forms a unity together with the antenna wave guide member 21, which is provided with flanges 22 for facing and supporting the measurement circuitry 23, represented in figure 3 by a circuit board 23a.
  • a mechanical enclosure 24 is normally protecting the measurement circuitry 23. Said enclosure 24 is partly removed for the sake of clarity.
  • the circuit board 23a containing electronic components of the radar level gauge is attached to the flanges 22 of the antenna wave guide member 21 by means of an intermediate dielectric barrier 25 according to the invention, in figure 3 formed as an insulation sheet.
  • a metal cap 26 formed as an end piece for closing the wave guide in the direction off the antenna is arranged on the circuit board 23a.
  • a micro strip 27 for transmitting microwaves in the direction of the wave guide is mounted on the circuit board 23a.
  • FIG. 3 is a possible arrangement according to the invention.
  • the thick insulation layer 25, in this embodiment as a washer, is attached to the metallic support/protection- box (enclosure 24) by adhesive to form a longitudinal wave guide sealing and the printed circuit board 23a has a ground plane on its bottom (except for the wave guide opening) and a wave guide end piece formed as a metal cap 26 is attached on its top.
  • An alternative embodiment is to use a dielectric insulation sheet 25 rather than a washer to obtain both electrical insulation and longitudinal sealing for both protection during service and to stop leakage through the wave guide.
  • a sealing is needed at one or two locations along the wave guide to seal the tank and to protect or seal the electronic unit.
  • a third kind of requirement for sealing is a seal for explosion protection used in one kind of Ex- protection.
  • a sealing with, e. g. an O-ring, is normally provided between the dielectric barrier and the wave guide, as shown in one of the drawings and this is the case both for the dielectric barrier formed as an insulation sheet and an insulation washer.
  • a further method is indicated in fig 5 with a quarter-wave pocket 30 (also called quarterwave choke) located around the wave guide to combine radial electrical sealing with longitudinal mechanical sealing.
  • a quarter-wave pocket 30 also called quarterwave choke
  • Another arrangement for obtaining an electrical sealing is shown in the sectional side view of figure 12 and includes a pressure sealing unit (gasket) 55 of microwave attenuating material located below (above would be possible) the insulating sheet 25.
  • the arrangement in fig 12 has the advantage, as compared to that of fig 5, that the gasket can be made rather thin ( ⁇ /4).
  • the gasket 55 can be made of a material allowing it to combine the functions of microwave sealing and a pressure sealing.
  • Additional features can be obtained by applying one or two quarter-wave pockets around the dielectric barrier or to add pattern in the sheet to obtain good electrical match in spite of a thick dielectric layer needed for meeting authority insulation requirements. Unless an insulation sheet is very thin (and thus probably not suited to fulfil formal insulation requirements) it will cause a very undesired distortion (reflection or VSWR) in the microwave propagation but by a suitable design such distortion can be arbitrarily reduced. Two or more cooperating distortions are one possibility known from other wave guide applications.
  • Fig 6 shows the invention applied in a separable joint located where the electronic unit above is attached to a second wave guide member 31 and an antenna wave guide member 32 continuing to and attached to the antenna and said separable joint provided with the insulation sheet 25 between said antenna wave guide member and said second wave guide member and where said thick sealing and insulation sheet 25 is used both for radial electrical sealing and longitudinal mechanical (gas, liquid etc.) sealing.
  • the sealing (insulation) sheet 25 is located between the two wave guide flanges 33, 34 that are designed for electrical and (optional) mechanical sealing.
  • a nut 35 made of insulating material (dotted) can be used for mechanical attachment. If another insulating washer is used a metal nut can be used.
  • a quarter wave pocket can be added for improved electrical function and (not shown) one or more O-ring seal can also be added.
  • the sealing (insulation) sheet 25 can be fitted with a conductive pattern giving a reflection in the wave guide, which counteracts with the reflection caused by the sheet 25 and thus improve the overall electrical match.
  • a conductive pattern can in terms of improved electrical match replace the quarter-wave pocket and enable a thicker sheet to be used.
  • Two common frequencies used for radar level gauging are in two bands in the vicinity of 6 GHz and 25 GHz.
  • the requirement for a 0.5 mm insulating layer implies that the design around the insulating layer must be well designed in order to avoid disturbances in the microwave function as the microwave wavelength in the insulation material may be for instance 8 mm.
  • FIG. 7a illustrates an opening where the plane of the opening intersects the wave guide in an angle different from 90 degrees, which can be an advantageous embodiment in cases where there is a risk of condensated liquid to accumulate below the dielectric barrier.
  • the antenna wave guide member has a wall at the end with a slot 26 provided in said wall for feeding microwaves through the slot.
  • the slot 26 forms a part of the wave guide having a smaller cross sectional area compared to the full size area of the remaining part of the antenna wave guide member 21.
  • the insulation sheet 25 is arranged across the slot on the outer side of the end wall.
  • An intersection along the line A - A is shown in plane view in the figure.
  • the wall can of course also in this case be inclined in relation to a wave guide axis.
  • the dielectric barrier is arranged across the outside of said wall.
  • Fig. 8 discloses a joint having a dielectric barrier 40 formed like a hat with its sides embedded inside longitudinal flanges 41 and 42 of the waveguide, flange 41 being a part of the antenna wave guide member and flange 42 being a part of the second wave guide member.
  • the flat part of the hat in this case, extends along the intersection of the wave guide as indicated above.
  • FIG. 9 A further embodiment is shown in figure 9, where it is illustrated an enclosure 43 around the measurement circuitry. At least a part of the enclosure wall 44 constitutes the dielectric barrier, where this enclosure wall 44 is made of the dielectric material.
  • a circuit board 45 including components of the measurement circuitry is mounted inside said enclosure wall 44.
  • a supporting flange 46 is provided on the antenna wave guide member 47. The antenna wave guide portion around the flange 46 is provided with quarter wave chokes.
  • FIG. 10 Yet another embodiment of the invention is shown in fig. 10, where the dielectric board 48 is formed as the dielectric barrier facing the antenna wave guide member 49.
  • the dielectric board in this case, performs both the function as an insulation layer and as a sealing against the wave guide member 49.
  • the whole measurement circuitry including the insulation barrier may in this embodiment be accomplished on one circuit board.
  • the circuit board may be performed as a multi layer board.
  • the circuit board has of course no conductors penetrating the first side of the dielectric barrier (towards the antenna wave guide member).
  • FIG. 11 depicts an embodiment of a wave guide joint having flanges on both sides of the insulation sheet 51 for the support of said sheet.
  • the numeral 52 denotes the flange of the antenna wave guide member and numeral 53 refers to the flange of the second wave guide member.
  • a sealing between the dielectric barrier 51 and the antenna wave guide member is also shown. Said sealing is in this example an O-ring, a sealing which could be used and provided in any of the embodiments earlier described.
  • FIG. 12 An alternative to the quarter wave choke in figure 5 is shown in Fig. 12, where a gasket (55) of microwave absorbing material (preferable but not necessarily a quarter wave of a wavelength wide) located in a corresponding groove (56) is used instead of the choke.
  • a gasket (55) of microwave absorbing material preferable but not necessarily a quarter wave of a wavelength wide located in a corresponding groove (56) is used instead of the choke.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Waveguide Aerials (AREA)

Abstract

L'invention concerne un indicateur du niveau radar (13) utilisant les ondes millimétriques pour mesurer un niveau de surface (16) d'un produit (12) dans un réservoir. Il comprend une antenne (15) pour transmettre les ondes millimétriques jusqu'à la surface et recevoir les ondes millimétriques réfléchies par la surface, des circuits de mesure alimentant ladite antenne via un guide d'ondes creux et ledit guide d'ondes comprenant au moins un élément de guide d'ondes d'antenne (21), pouvant être couplé à une extrémité à l'antenne (15) et possédant à l'autre extrémité une ouverture dans une intersection dans guide d'ondes. En outre, l'indicateur du niveau radar comprend aussi une barrière diélectrique (25) qui s'étend le long de ladite intersection à travers l'ouverture dudit élément de guide d'ondes d'antenne (21) pour séparer sans conduction ledit élément de guide d'ondes d'antenne du circuit de mesure, ladite barrière diélectrique (25) possédant un premier côté tourné vers le guide d'ondes, en direction du guide d'ondes d'antenne (21), et ladite barrière diélectrique (25) possédant un deuxième côté tourné dans une direction hors de l'élément de guide d'ondes d'antenne.
PCT/SE2004/001510 2003-10-20 2004-10-19 Procede et appareil destines a isoler un indicateur du niveau radar WO2005038414A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004001988T DE112004001988T5 (de) 2003-10-20 2004-10-19 Verfahren und Vorrichtung zur Isolierung eines Radarfüllstandsmessgeräts

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/687,975 US6950055B2 (en) 2003-10-20 2003-10-20 Method and an apparatus for insulation of a radar level gauge
US10/687,975 2003-10-20
SE0302772-9 2003-10-20
SE0302772A SE0302772D0 (sv) 2003-10-20 2003-10-20 A method and an apparatus for insulation of a radar level gauge

Publications (1)

Publication Number Publication Date
WO2005038414A1 true WO2005038414A1 (fr) 2005-04-28

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PCT/SE2004/001510 WO2005038414A1 (fr) 2003-10-20 2004-10-19 Procede et appareil destines a isoler un indicateur du niveau radar

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DE (1) DE112004001988T5 (fr)
WO (1) WO2005038414A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006038861A1 (fr) * 2004-10-01 2006-04-13 Rosemount Tank Radar Ab Joint d'etancheite aux micro-ondes pour indicateurs de niveau a radar
WO2007017137A2 (fr) * 2005-08-04 2007-02-15 Vega Grieshaber Kg Separation de potentiel pour radar de mesure de niveau de remplissage
US7548072B2 (en) 2006-01-27 2009-06-16 Vega Grieshaber Kg Potential separation for filling level radar
US7640799B2 (en) 2005-08-04 2010-01-05 Vega Grieshaber Kg Potential separation for fill level radar
US7752911B2 (en) 2005-11-14 2010-07-13 Vega Grieshaber Kg Waveguide transition for a fill level radar
US8711049B2 (en) 2005-08-04 2014-04-29 Vega Grieshaber Kg Potential separation for filling level radar
WO2016089689A1 (fr) * 2014-12-01 2016-06-09 Honeywell International Inc. Signal de diagnostic pour annoncer une défaillance primaire d'étanchéité dans un émetteur de niveau
US10224597B2 (en) 2013-07-03 2019-03-05 Endress+Hauser SE+Co. KG Antenna arrangement for a fill-level measuring device
US10310056B2 (en) 2015-03-13 2019-06-04 Honeywell International Inc. Apparatus and method for adjusting guided wave radar pulse width to optimize measurements
EP1910784B1 (fr) * 2005-08-04 2020-03-18 VEGA Grieshaber KG Élément d'isolement pour radar de détection de niveau
US10634542B2 (en) 2016-06-22 2020-04-28 Honeywell International Inc. Adaptive sync control in radar level sensors
US10768035B2 (en) 2015-08-11 2020-09-08 Endress+Hauser Se+Co.Kg Radar-fill-level measuring device
CN113782933A (zh) * 2021-08-19 2021-12-10 北京古大仪表有限公司 波导组件和雷达物位计
WO2023285300A1 (fr) * 2021-07-16 2023-01-19 Endress+Hauser SE+Co. KG Dispositif de mesure de niveau de remplissage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021131501A1 (de) 2021-11-30 2023-06-01 Endress+Hauser SE+Co. KG Füllstandsmessgerät

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762089A2 (fr) * 1995-09-05 1997-03-12 Krohne Messtechnik Gmbh & Co. Kg Dispositif de mesure du niveau
US5872494A (en) * 1997-06-27 1999-02-16 Rosemount Inc. Level gage waveguide process seal having wavelength-based dimensions
US6401532B2 (en) * 2000-05-15 2002-06-11 Krohne Messtechnik Gmbh & Co. Kg Fill level gauge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762089A2 (fr) * 1995-09-05 1997-03-12 Krohne Messtechnik Gmbh & Co. Kg Dispositif de mesure du niveau
US5872494A (en) * 1997-06-27 1999-02-16 Rosemount Inc. Level gage waveguide process seal having wavelength-based dimensions
US6401532B2 (en) * 2000-05-15 2002-06-11 Krohne Messtechnik Gmbh & Co. Kg Fill level gauge

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7239267B2 (en) 2004-10-01 2007-07-03 Rosemount Tank Radar Ab Microwave sealing for radar level gauges
WO2006038861A1 (fr) * 2004-10-01 2006-04-13 Rosemount Tank Radar Ab Joint d'etancheite aux micro-ondes pour indicateurs de niveau a radar
EP1910784B1 (fr) * 2005-08-04 2020-03-18 VEGA Grieshaber KG Élément d'isolement pour radar de détection de niveau
WO2007017137A2 (fr) * 2005-08-04 2007-02-15 Vega Grieshaber Kg Separation de potentiel pour radar de mesure de niveau de remplissage
WO2007017137A3 (fr) * 2005-08-04 2007-04-12 Grieshaber Vega Kg Separation de potentiel pour radar de mesure de niveau de remplissage
US7640799B2 (en) 2005-08-04 2010-01-05 Vega Grieshaber Kg Potential separation for fill level radar
US8711049B2 (en) 2005-08-04 2014-04-29 Vega Grieshaber Kg Potential separation for filling level radar
US7752911B2 (en) 2005-11-14 2010-07-13 Vega Grieshaber Kg Waveguide transition for a fill level radar
US7548072B2 (en) 2006-01-27 2009-06-16 Vega Grieshaber Kg Potential separation for filling level radar
US10224597B2 (en) 2013-07-03 2019-03-05 Endress+Hauser SE+Co. KG Antenna arrangement for a fill-level measuring device
WO2016089689A1 (fr) * 2014-12-01 2016-06-09 Honeywell International Inc. Signal de diagnostic pour annoncer une défaillance primaire d'étanchéité dans un émetteur de niveau
US10859427B2 (en) 2014-12-01 2020-12-08 Honeywell International Inc. Diagnostic signal to annunciate primary seal failure in a level transmitter
US10310056B2 (en) 2015-03-13 2019-06-04 Honeywell International Inc. Apparatus and method for adjusting guided wave radar pulse width to optimize measurements
US10768035B2 (en) 2015-08-11 2020-09-08 Endress+Hauser Se+Co.Kg Radar-fill-level measuring device
US10634542B2 (en) 2016-06-22 2020-04-28 Honeywell International Inc. Adaptive sync control in radar level sensors
WO2023285300A1 (fr) * 2021-07-16 2023-01-19 Endress+Hauser SE+Co. KG Dispositif de mesure de niveau de remplissage
CN113782933A (zh) * 2021-08-19 2021-12-10 北京古大仪表有限公司 波导组件和雷达物位计

Also Published As

Publication number Publication date
DE112004001988T5 (de) 2006-12-21

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