EP1317659A1 - Dispositif de mesure d'etat de remplissage - Google Patents

Dispositif de mesure d'etat de remplissage

Info

Publication number
EP1317659A1
EP1317659A1 EP01945244A EP01945244A EP1317659A1 EP 1317659 A1 EP1317659 A1 EP 1317659A1 EP 01945244 A EP01945244 A EP 01945244A EP 01945244 A EP01945244 A EP 01945244A EP 1317659 A1 EP1317659 A1 EP 1317659A1
Authority
EP
European Patent Office
Prior art keywords
probe
section
container
housing
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01945244A
Other languages
German (de)
English (en)
Inventor
Herbert Schroth
Armin Wendler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and 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 and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP1317659A1 publication Critical patent/EP1317659A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—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
    • 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

Definitions

  • the invention relates to a fill level measuring device for measuring a fill level of a filling material in a container, which has a housing, which is to be fastened to the container by means of a fastening device, and a probe to be guided into the container.
  • fill level measuring devices working with electromagnetic signals.
  • the signals are transmitted to at least one probe that serves as a waveguide and is guided into the container.
  • the probe leads the signals into the container and at one
  • Reflected surface For example, a transit time of the electromagnetic signals is determined and the fill level is determined therefrom.
  • An electronic circuit for generating electromagnetic signals and a receiving and evaluation circuit for determining a level is e.g. described in EP-A 780 665.
  • Suitable waveguides are e.g. bare also as
  • Sommerfeld waveguides are designated metal wires, or metal wires provided with insulation. The latter are also known as Goubau waveguides.
  • level measuring devices are capacitive level measuring devices.
  • the probe forms, together with a wall of the container, a capacitor, the capacitance of which depends on the current level.
  • the capacitance is usually detected by means of a measuring circuit and converted into a level-dependent measuring signal.
  • Fill level measuring devices of this type can be used in a large number of applications, both in warehousing and in the processing industry, for example in chemistry, in the food industry and in the oil industry.
  • the housing and probe When installing and removing conventional level gauges, the housing and probe are moved, typically rotated, relative to a container opening through which the probe is to be inserted into the container. Because of their small space requirements, fastening devices that are preferably used are screw-in threads provided on the housing by means of which the housings are screwed into screw-in sockets on the container.
  • the probe placed in the container initially lies on the product.
  • a rotational movement of the probe required to fasten the housing can lead to twisting or entangling of the rope and in the worst case even knots in the rope.
  • Measuring a level of a filling material in a container which comprises: a housing having a first section and a second section,
  • the measuring device is a level measuring device working with microwaves, which emits microwaves into the container by means of an antenna protruding into the container above a highest level to be measured, which microwaves are then reflected on the surface of the product and are received by the antenna.
  • the antenna is rotatably inserted into the housing and protrudes through the housing into the container. It lies rotatably on a heel surface existing between the first and the second section.
  • the antenna is fastened by a spring washer which rests on an annular surface of the antenna facing away from the container and which is fixed by means of a snap ring which is introduced into a groove in the housing. This ensures that the antenna in the housing can be rotated into a desired position after the housing has been finally mounted on the container.
  • the invention consists in a level measuring device for measuring a level of a filling material in a container, which comprises:
  • a housing having a first section and a second section
  • a fastening device provided on the housing for fastening the level measuring device on the container
  • a connecting element which connects the insert and the probe along an extension of a longitudinal axis of the probe.
  • the connecting element is a threaded rod screwed into the insert, and the probe is screwed onto an end of the threaded rod that extends through the first section.
  • a seal is arranged between an end of the first section facing away from the second section and the probe.
  • the seal has a conical outer lateral surface with which it bears on an inner lateral surface of the first section of the housing in relation to the housing such that it can rotate about a longitudinal axis of the probe.
  • the seal has a conical inner circumferential surface which bears on an outer circumferential surface of the probe and via which the seal is pressed in the direction of the second section when the probe is screwed in.
  • the seal is a ring with a double conical cross section.
  • the seal has an annular circumferential groove on the inside and / or outside, into which an additional sealing element is introduced.
  • the additional sealing element is a shaft seal.
  • the probe is fed with electromagnetic signals during operation, which run along the probe to the product surface, where it is reflected and received again, and whose transit time is a measure of the current fill level.
  • the probe forms, together with a wall of the container, a capacitor, the capacitance of which depends on the current level and is detected during operation by means of a measuring circuit and converted into a level-dependent measurement signal.
  • the probe can be fixed by means of a clamping pin which is secured by a
  • FIG. 1 shows a schematic representation of a arranged on a container
  • Fig. 2 shows an enlarged schematic representation of the essential areas of the level measuring device according to the invention in longitudinal section
  • Fig. 3 shows a schematic representation of a
  • FIG. 1 shows a schematic illustration of a level measuring device 3 arranged on a container 1. It is used to measure a level of a filling material 5 in the container.
  • the filling material 5 is introduced into the container 1 through a filler neck 7 arranged at the top of the container 1 and removed via a drain valve 9 attached to the bottom of the container 1.
  • the fill level measuring device 3 has a housing 11 which has a first section 13 provided with a fastening device 14.
  • the level measuring device 3 is fastened on the container 1 with the fastening device 14.
  • the exemplary embodiment is the fastening device 14 an external thread, which is screwed into a nozzle 15 arranged on the top of the container 1.
  • the housing 11 has an externally hexagonal section 16 above the external thread, to which a wrench can be attached.
  • the fastening device 14 has the advantage that it only takes up a very small space and small openings in the container 1 are sufficient for the attachment of the level measuring device.
  • the fill level measuring device 3 has a probe 17 which leads through the housing 11 into the container 1.
  • the probe 17 is e.g. a rod or a wire.
  • a rope can also be used in the same way.
  • Such probes 17 are rope probes which protrude into the container 1.
  • a weight 19 can be attached to the end of the probe 17, by which the probe 17 is tensioned.
  • PTFE Polytetrafluoroethylene
  • a length of the probe 17 is to be dimensioned such that the probe 17 ends in the extended state below the lowest level to be measured in the container 1.
  • Fig. 2 shows an enlarged schematic representation of the essential areas of the level measuring device according to the invention in longitudinal section.
  • the housing 11 has a second section 21 directly adjacent to it.
  • the first and the second section 13, 21 each have a central axial bore.
  • the first section 13 has a smaller inner diameter than the second section 21.
  • a rotationally symmetrical insert 23 Arranged in the second section 21 is a rotationally symmetrical insert 23, which is essentially cylindrical in the exemplary embodiment shown, and which almost completely fills the second section 21.
  • the insert 23 is rotatably arranged with respect to the housing 11 in FIG Section 13, 21 existing sales surface 25 rotatably rests.
  • a connecting element is provided which connects the insert 23 and the probe 17 along an extension of a longitudinal axis of the probe 17. This purely axial connection ensures that the insert 23 and the probe 17 are rotatable relative to the housing 11.
  • connection is a threaded rod 29.
  • the insert 23 has a continuous central axial bore 27, the end of which faces the first section 13 has an internal thread into which the threaded rod 29 is screwed.
  • the end of the probe 17 is provided with a sleeve 31 which has a central axial bore 33 with an internal thread 35. It is screwed onto an end of the threaded rod 29 leading through the first section 13 by means of a screw connection. An end of the sleeve 31 facing away from the threaded rod 29 either merges continuously into the area of the probe 17 guided into the container 1 or, as shown in the exemplary embodiment in FIG. 2, a further axial bore 34 is provided, in which an in the container 1 leading area 18 of the probe 17, for example fixed by crimping or by clamping screws.
  • annular cylindrical gap 37 between the first section 13 and the threaded rod 29, the sleeve 31 and the probe 17. be filled with a dielectric.
  • connection elements that connect the insert 23 and the probe 17 along an extension of the longitudinal axis of the probe 17 can also be used.
  • a rod can be used with which the Insert 23 and the probe 17 are connected by means of a snap connection.
  • the probe 17 can be connected to the insert 23 directly as an extension of its longitudinal axis.
  • a seal 39 is arranged between an end of the first section 13 facing away from the second section 23 and the probe 17.
  • the seal 39 is a ring with a double-conical cross section, which surrounds the probe 17. It consists of a dielectric, e.g. made of polytetrafluoroethylene (PTFE).
  • the seal 39 has a conical outer jacket surface 41, with which it bears on an inner jacket surface of the first section 13 of the housing 11 relative to the housing 11 such that it can rotate about a longitudinal axis L of the probe 17.
  • this outer jacket surface 41 can be coated with a lubricant, e.g. 01 or bold.
  • the seal 39 has a conical inner jacket surface 43 which bears on an outer jacket surface of the probe 17 and via which the seal 39 is pressed in the direction of the second section 23 when the probe 17 is screwed in.
  • the seal 39 together with the rotatably mounted insert 23 into which the threaded rod 29 is screwed, allows the probe 17 to rotate freely relative to the housing 11.
  • a movement of the probe 17 in the container in particular a rotary movement not mandatory.
  • the housing 11 can be screwed into or out of the socket 15 without the probe 17 moving.
  • the seal 39 can have annular grooves 45, 47 on the inside and / or outside, into each of which an additional sealing element is introduced. While the material of the seal 39 is restricted depending on the respective application, the material from which the additional sealing element or elements are made can be chosen almost freely.
  • the additional sealing elements are arranged in the grooves 45, 47 in a protected manner and do not have to withstand the possibly high pressure in the container and the mechanical stress caused by abrasive filling goods, since they come into contact with the filling material only to a very limited extent.
  • a shaft seal is particularly suitable as an additional sealing element in the outer groove 47. Shaft seals facilitate the rotatability of the probe 17 relative to the housing 11.
  • a clamping pin 49 is provided, which, if necessary, allows the insert 23 to be fixed and thus prevents any rotation of the probe 17 relative to the housing 11. This is e.g. When transporting the level measuring device or in the actual measuring operation following the installation of the level measuring device is an advantage.
  • the clamping pin 49 engages through an opening 51 in a wall of the second section 23 into a recess 53 in the insert 23.
  • the level measuring device works, for example, as already described at the beginning, with electromagnetic signals for which the probe 17 forms a waveguide.
  • the probe 17 is connected via the threaded rod 29 to an electronic circuit, not shown in FIG. 2, which feeds the probe 17 with electromagnetic signals during operation.
  • the coupling of electromagnetic signals can e.g. via a coaxial line, the inner conductor of which is connected to the probe 17 via the threaded rod 29 and the outer conductor of which is connected to the housing 11 via a metallic sleeve.
  • the sleeve can e.g. slipped over the insert 23 and rotatably supported in a groove in the housing 11.
  • the insert 23 must be made of a dielectric, e.g. consist of polyaryl ether ketone (PEEK).
  • a coupling can be used, as described, for example, in German patent application filed on May 31, 2000 with the file number DE-A 100 27 228.2.
  • Such a coupling is shown schematically in FIG. 3. It consists, for example, in a half ring 55 shown in FIG. 3, which surrounds the threaded rod 29. The half ring 55 is spaced from the threaded rod 29.
  • the bore 27 running in the insert 23 opens into a cylindrical recess 57 at its end facing the first section 13.
  • the insert 23 consists of an electrically conductive material, for example a stainless steel, and has one parallel to the bore 27 extending, not visible in Fig. 2, further bore 59.
  • the coupling is connected to a coaxial line via which the electromagnetic signals are routed to the probe 17 and from there are routed back again.
  • An inner conductor of this coaxial line is connected to the half ring 55 via a line 63 led through the bore 59 and the connecting channel 61.
  • An outer conductor is connected to the electrically conductive insert 23, which is preferably connected to ground or to a fixed reference potential. Electromagnetic signals coupled into the probe 17 via the coaxial line, the line 63 and the half ring 55 run along the probe to the product surface, are reflected there and received again by the level measuring device. Their runtime is a measure of the current level.
  • the measuring device can of course also be a capacitive fill level measuring device, in which the probe 17 forms, together with a wall of the container, a capacitor, the capacitance of which depends on the current fill level.
  • the capacity is detected by means of a measuring circuit and converted into a level-dependent measuring signal.
  • the probe 17 is connected via the threaded rod 29 to a connecting line, not shown in FIG. an AC voltage is present at the probe 17.
  • the insert 23 consists of an insulator.
  • Housing 11 is metallic and housing 11 and container 1 are preferably grounded.
  • a suitable measuring circuit is e.g. an oscillator circuit suitable for frequency measurement, to which the capacitor formed by the probe 17 and the container 1 is connected as a frequency-determining element.

Abstract

La présente invention concerne un dispositif de mesure d'état de remplissage servant à mesurer l'état de remplissage d'un récipient (1) avec une matière de remplissage (5), ledit dispositif comprenant une sonde (17) dépassant à l'intérieur du récipient (1). L'invention a pour objet de permettre le montage et le démontage du dispositif de mesure d'état de remplissage, sans que soit nécessaire un déplacement de la sonde (17) dans le récipient (1). Ledit dispositif comprend: un boîtier (11) présentant une première partie (13) et une seconde partie (21), les parties (13, 21) dudit boîtier présentant chacune un orifice axial central (27), la première partie (13) ayant un diamètre intérieur inférieur à celui de la seconde partie (21); un dispositif de fixation (14) disposé contre le boîtier (11) afin de permettre la fixation du dispositif de mesure d'état de remplissage (3) sur le récipient (1); un élément rapporté (23) disposé dans le boîtier (11) de manière à pouvoir tourner par rapport audit boîtier (11), ledit élément rapporté reposant rotatif sur une surface d'appui (25) se trouvant entre la première et la seconde partie (13, 21); une sonde (17) dépassant à l'intérieur du récipient (1); et un élément de liaison qui sert à relier l'élément rapporté (23) et la sonde (17) dans le prolongement d'un axe longitudinal de la sonde (17).
EP01945244A 2000-09-13 2001-06-02 Dispositif de mesure d'etat de remplissage Withdrawn EP1317659A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10045235A DE10045235A1 (de) 2000-09-13 2000-09-13 Füllstandsmeßgerät
DE10045235 2000-09-13
PCT/EP2001/006320 WO2002023139A1 (fr) 2000-09-13 2001-06-02 Dispositif de mesure d'etat de remplissage

Publications (1)

Publication Number Publication Date
EP1317659A1 true EP1317659A1 (fr) 2003-06-11

Family

ID=7656030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01945244A Withdrawn EP1317659A1 (fr) 2000-09-13 2001-06-02 Dispositif de mesure d'etat de remplissage

Country Status (5)

Country Link
US (1) US6820510B2 (fr)
EP (1) EP1317659A1 (fr)
AU (1) AU2001267514A1 (fr)
DE (1) DE10045235A1 (fr)
WO (1) WO2002023139A1 (fr)

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DE10252530A1 (de) * 2002-11-08 2004-05-27 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Straffung eines Seiles und entsprechendes Verfahren
DE10301863B4 (de) * 2003-01-17 2022-03-10 Vega Grieshaber Kg Füllstandsmessgerät zum Einsetzen in einen Behälter
DE10308495A1 (de) * 2003-02-26 2004-09-16 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung des Füllstands eines Mediums in einem Behälter
US7117738B2 (en) * 2003-10-02 2006-10-10 Denso Corporation Liquid level detecting apparatus
US6988404B2 (en) * 2003-12-11 2006-01-24 Ohmart/Vega Corporation Apparatus for use in measuring fluid levels
US7283086B2 (en) * 2004-05-13 2007-10-16 Endress + Hauser Gmbh + Co. K.G. Fill level measuring device working with microwaves
DE102004060119A1 (de) * 2004-12-13 2006-06-14 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung der Prozessgröße Füllstand eines Füllguts in einem Behälter
US7592946B2 (en) * 2005-02-14 2009-09-22 Endress + Hauser Gmbh + Co. Kg Level measurement arrangement
US20070000320A1 (en) * 2005-06-08 2007-01-04 Jaeger Mark H Bin level monitor
US7467548B2 (en) * 2005-10-14 2008-12-23 Rosemount Tank Radar Ab Radar level gauge system and coupling
EP2154495B1 (fr) 2008-08-15 2013-05-22 Sick Ag Capteur TDR et procédé de mesure
EP2172749B1 (fr) * 2008-10-01 2015-07-01 VEGA Grieshaber KG Appareil de mesure du niveau de remplissage
DE102010038732B4 (de) 2010-07-30 2023-07-27 Endress+Hauser SE+Co. KG Vorrichtung und Verfahren zur Sicherung der Befestigung eines koaxial um eine Messsonde angeordneten Rohres einer Messsondeneinheit eines Füllstandsmessgerätes an einem Prozessanschlusselement
US9291492B2 (en) * 2013-03-12 2016-03-22 Rosemount Tank Radar Ab Tank feed through structure for a radar level gauge
US9383246B2 (en) * 2013-09-06 2016-07-05 Rosemount Tank Radar Ab Sectioned probe for a radar level gauge
US10066980B2 (en) * 2015-04-28 2018-09-04 Honeywell International Inc. Streamlined probe for guided wave radar measurement
DE102015220578A1 (de) * 2015-10-21 2017-04-27 Vega Grieshaber Kg Sondenendvorrichtung und Verfahren zum Herstellen einer Sondenendvorrichtung
ITUB20160245A1 (it) * 2016-02-05 2017-08-05 Fpt Ind Spa Sensore di misura, in particolare di un livello di un liquido, e motore a combustione interna comprendente detto sensore
DE102018126303B4 (de) * 2018-10-23 2021-03-11 Khs Gmbh Füllsystem zum Füllen von Behältern mit einem flüssigen Füllgut sowie Füllmaschine
DE102019102812A1 (de) * 2019-02-05 2020-08-06 Sick Ag Sensor zum Bestimmen einer Prozessgröße
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Also Published As

Publication number Publication date
US6820510B2 (en) 2004-11-23
DE10045235A1 (de) 2002-03-28
WO2002023139A1 (fr) 2002-03-21
AU2001267514A1 (en) 2002-03-26
US20040025588A1 (en) 2004-02-12

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