WO2017220395A1 - Appareil de mesure de niveau protégé contre les submersions - Google Patents

Appareil de mesure de niveau protégé contre les submersions Download PDF

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Publication number
WO2017220395A1
WO2017220395A1 PCT/EP2017/064511 EP2017064511W WO2017220395A1 WO 2017220395 A1 WO2017220395 A1 WO 2017220395A1 EP 2017064511 W EP2017064511 W EP 2017064511W WO 2017220395 A1 WO2017220395 A1 WO 2017220395A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
antenna
cavity
level gauge
level
Prior art date
Application number
PCT/EP2017/064511
Other languages
German (de)
English (en)
Inventor
Gerd BECHTEL
Florian Palatini
Daniel Kopp
Klaus Feisst
Original Assignee
Endress+Hauser Gmbh+Co. 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 Endress+Hauser Gmbh+Co. Kg filed Critical Endress+Hauser Gmbh+Co. Kg
Publication of WO2017220395A1 publication Critical patent/WO2017220395A1/fr

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
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • 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

Definitions

  • the invention relates to a radar-based level gauge, which is flood-safe.
  • field devices are often used which serve for detecting and / or influencing process variables.
  • sensors are used which, for example, in
  • process variables such as level, flow, pressure,
  • Actuators such as valves or valves, are used to influence process variables
  • Pipe section or the level can be changed in a container.
  • container also means unfilled containers, such as, for example, basins, lakes or flowing waters
  • field devices additionally also mean remote I / Os, radio adapters or generally electronic components, which are arranged on the field level.
  • remote I / Os radio adapters or generally electronic components, which are arranged on the field level.
  • a large number of these field devices are manufactured and sold by Endress + Hauser.
  • Non-contact measuring methods established because they are robust and low maintenance. Another advantage is their ability to quasi level
  • An established measurement principle here is the pulse transit time measuring principle, also known as pulse radar.
  • pulse radar There is also the FMCW method, in which a continuous microwave signal with changing frequency is used.
  • level gauges In addition to sufficient measuring accuracy, level gauges must meet additional requirements, for example in the field of explosion protection. Thus, it may happen that in the container prevails a flammable atmosphere, for example, when it is the contents of fuel or dusty bulk materials.
  • the requirements in this area can be subdivided into different types of protection, they are specified in, inter alia, the EN 60079 series of standards. This is particularly relevant for the antenna unit of the level gauge, since it is that component of the level gauge, which is at least indirectly in contact with the contents.
  • a number of protective measures with regard to the antenna unit of radar-based level measuring devices are already known from the prior art. Thus, in the published patent application DE 10 2012 103 493 A1 a
  • Level gauge described with a horn antenna in which the hollow antenna interior of the horn antenna has several constructive process separations.
  • the device electronics which is arranged within the housing of the level measuring device, separated for the purpose of explosion protection from the contents.
  • the level exceeds the level gauge and can penetrate into the antenna accordingly. In this case, it can not be ruled out that even with existing process separations the
  • Level echo is superimposed by device-internal reflections and thus a wrong level value is determined. This entails particular risks if the incorrectly determined level value is lower than the true level.
  • the antenna can be integrated into the housing to circumvent this problem.
  • the antenna is usually so compact design, that the emission cone is too large, at least for free-field applications.
  • the invention is therefore based on the object of a radar-based
  • Level gauge to provide, which is also suitable for applications where there is a risk that the maximum level is exceeded.
  • the invention solves this problem by a level gauge for
  • An antenna located in the housing for emitting and / or
  • Antenna attachment with a cavity wherein the cavity adjoins the housing and has an outlet opening facing the filling material.
  • the level measuring device is characterized in that the antenna attachment is designed and arranged on the housing such that the cavity seals gas-tight to the housing.
  • the antenna attachment is connected via a detachable connection to the housing.
  • the antenna attachment it is possible for the antenna attachment for applications that require a compact design of the level gauge and where there is no risk of exceeding the maximum level L max , optionally decrease.
  • the releasable connection as screw connection or flange connection
  • the compound can not be made gas-tight as such, can for gas-tight sealing between the
  • Antenna attachment and the housing also one or more
  • Sealing elements such as corresponding O or X rings are arranged.
  • the antenna attachment can bring about additional bundling of the microwaves emitted by the antenna.
  • This can be achieved by the cavity has a cylindrical shape with a circular cross-section corresponding to the antenna.
  • the cavity connects correspondingly over the end face of the cylinder there to the housing, where the antenna is located inside the housing. It is advantageous in this case, when the antenna attachment is arranged on the housing such that the cylinder axis is aligned with the emission axis of the antenna.
  • a further improvement is achieved in that the cross-section of the cavity widens conically at least in a partial region in the direction of the filling material. Optimum bundling is achieved when the cavity expands to match the opening angle of the antenna.
  • the antenna attachment In order to achieve the bundling function of the antenna attachment, it is also necessary for it to be electrically conductive at least in corresponding subregions of the cavity. So if the antenna attachment is not constructed of a metallic body, but from a (fluid-impermeable) plastic body, it is for additional
  • Bundling function advantageous if the antenna attachment has a metallic coating at least in a partial region of the cavity. This can be applied for example by means of PVD ("physical vapor deposition").
  • the housing at least in the area between the antenna and the
  • Antenna attachment for the emitted and received microwaves is designed at least partially transparent. Accordingly, that should Material and / or the geometry in this region of the housing are chosen such that the microwave radiation is absorbed as little as possible.
  • the housing fluid-tight against the filling material If the housing is constructed in several parts, so for example, the compounds are sealed accordingly gap-free. This also applies to any openings of the housing for cable guides, by means of which the device electronics is contacted within the housing.
  • the material from which the housing is constructed must be resistant to the contents. In the case of corrosive fillers, accordingly, resistant plastics are suitable as housing bodies or suitable
  • Fig. 1 a schematic arrangement of an inventive
  • FIG. 2 shows a sectional view of the fill level measuring device according to the invention
  • FIG. 3 shows a second embodiment variant of the invention
  • FIG. 1 shows a schematic arrangement of a fill level measuring device 1 according to the invention on a container 2.
  • the container 2 is a filling material 3, the level of which L is to be determined by the level gauge 1.
  • the level gauge 1 is in one
  • Antenna attachment 6 in the direction of the surface of the filling 3 emits.
  • the Antenna attachment 6 is in this case on a fluid-tight housing 4 of the
  • Level gauge 1 attached. After reflection on the product surface, the level gauge 1 receives the reflected microwaves
  • the level measuring device 1 is connected to a higher-level process control system via a bus system, such as "PROFIBUS", “HART” or “Wireless HART.”
  • a bus system such as "PROFIBUS", "HART” or “Wireless HART.”
  • Level L are transmitted to control, for example, the container 2 existing inflows and outflows.
  • Fig. 1 the critical case is shown that the level L exceeds a maximum level value L max .
  • This is radar-based
  • Level measuring devices usually at the bottom of the horn antenna. If the level rises above the lower edge, contents 3 penetrate into the horn antenna and there is a risk that an incorrect level value will be determined.
  • One reason for this may be that level echoes from the interior of the antenna may be superimposed by device-internal spurious echoes that occur primarily in the same time range. This can lead, for example, to the fact that the echo of the container bottom is mistakenly interpreted as the supposed level echo and as a result an insufficient fill level value is output.
  • it can have a critical effect that the horn antenna can be pulled to ground potential on contact with the product 3.
  • FIG. 2 shows a sectional view of the invention
  • Level gauge 1 This view shows that an antenna 5 for emitting and receiving the microwaves is arranged inside the housing 4. In the embodiment shown is a horn antenna. The antenna attachment 6 is on the
  • the antenna attachment 6 is fastened to the housing 4 via a screw connection 8.
  • the corresponding region of the housing 4 is designed for this purpose as an external thread.
  • the antenna attachment 6 comprises in the tapered end region of the cavity 7
  • the gas impermeability according to the invention between the cavity 7 and the housing 4 in the region of the screw connection 8 is achieved in the illustrated embodiment via an O-ring 9.
  • the O-ring 9 is in this case arranged so that it seals the antenna attachment 6 by screwing it axially to the housing 4.
  • Fig. 3 is another embodiment of the invention.
  • Level gauge 1 shown. It's different from that

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un appareil de mesure de niveau (1) basé sur un radar et protégé contre les submersions. À cet effet, l'appareil comprend une antenne (5) à l'intérieur d'un boîtier, et un élément d'antenne rapporté (6) agencé sur une surface extérieure du boîtier (4) et présentant une cavité (7), la cavité (7) étant dans le prolongement du boîtier (4) et présentant une ouverture de sortie (3) orientée vers le produit de remplissage (3). L'appareil de mesure de niveau (1) est caractérisé en ce que l'élément d'antenne rapporté (6) est conçu et agencé sur le boîtier (4) de telle manière que la cavité (7) est rendue étanche au gaz par rapport au boîtier (4). L'étanchéité permet qu'un coussin d'air se forme à l'intérieur de la cavité (7) dès que le niveau (L) monte au-dessus de l'élément d'antenne rapporté (6). Le coussin d'air empêche à son tour l'entrée du produit de remplissage (3) dans la cavité. L'invention permet ainsi d'éviter des valeurs de niveau erronées qui pourraient être causées par une submersion de l'antenne (5).
PCT/EP2017/064511 2016-06-20 2017-06-14 Appareil de mesure de niveau protégé contre les submersions WO2017220395A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016111259.3 2016-06-20
DE102016111259.3A DE102016111259B4 (de) 2016-06-20 2016-06-20 Überflutungssicheres Füllstandsmessgerät

Publications (1)

Publication Number Publication Date
WO2017220395A1 true WO2017220395A1 (fr) 2017-12-28

Family

ID=59062002

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/064511 WO2017220395A1 (fr) 2016-06-20 2017-06-14 Appareil de mesure de niveau protégé contre les submersions

Country Status (2)

Country Link
DE (1) DE102016111259B4 (fr)
WO (1) WO2017220395A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305237A (en) * 1991-07-12 1994-04-19 Union Tank Car Company Method and apparatus for monitoring a flowable material in a transportable vessel
US20030151560A1 (en) * 2001-11-26 2003-08-14 Vega Grieshaber Kg Antenna system for a level measurement apparatus
US7259712B1 (en) * 2004-09-30 2007-08-21 Siemens Milltronics Process Instruments Inc. Antenna with integral sealing member for a radar-based level measurement system
DE102012103493A1 (de) 2012-04-20 2013-10-24 Endress + Hauser Gmbh + Co. Vorrichtung zur Bestimmung des Füllstandes eines Füllguts in einem Behälter
EP2871450A2 (fr) * 2013-11-08 2015-05-13 VEGA Grieshaber KG Antenne chauffée

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1126251A3 (fr) * 2000-02-17 2002-05-29 Endress + Hauser GmbH + Co. KG Dispositif de mesure du niveau
DE102005056042B4 (de) * 2005-11-24 2015-11-05 Vega Grieshaber Kg Metallisierter Kunststoffantennentrichter für ein Füllstandradar
BR112013031934B1 (pt) * 2011-09-06 2020-06-02 Stamicarbon B.V. Método de radar para detectar nível, reator de síntese de uréia e uso do sistema de radar
DE102013106978A1 (de) * 2013-07-03 2015-01-22 Endress + Hauser Gmbh + Co. Kg Antennenanordnung für ein Füllstandsmessgerät
DE102014101904A1 (de) * 2014-02-14 2015-08-20 Endress + Hauser Gmbh + Co. Kg Effiziente Dispersionskorrektur für FMCW-Radar in einem Rohr

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305237A (en) * 1991-07-12 1994-04-19 Union Tank Car Company Method and apparatus for monitoring a flowable material in a transportable vessel
US20030151560A1 (en) * 2001-11-26 2003-08-14 Vega Grieshaber Kg Antenna system for a level measurement apparatus
US7259712B1 (en) * 2004-09-30 2007-08-21 Siemens Milltronics Process Instruments Inc. Antenna with integral sealing member for a radar-based level measurement system
DE102012103493A1 (de) 2012-04-20 2013-10-24 Endress + Hauser Gmbh + Co. Vorrichtung zur Bestimmung des Füllstandes eines Füllguts in einem Behälter
EP2871450A2 (fr) * 2013-11-08 2015-05-13 VEGA Grieshaber KG Antenne chauffée

Also Published As

Publication number Publication date
DE102016111259A1 (de) 2017-12-21
DE102016111259B4 (de) 2024-02-29

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