WO2002095420A2 - Raccord procede - Google Patents

Raccord procede Download PDF

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Publication number
WO2002095420A2
WO2002095420A2 PCT/EP2002/005063 EP0205063W WO02095420A2 WO 2002095420 A2 WO2002095420 A2 WO 2002095420A2 EP 0205063 W EP0205063 W EP 0205063W WO 02095420 A2 WO02095420 A2 WO 02095420A2
Authority
WO
WIPO (PCT)
Prior art keywords
process connection
housing
shaped
cable
probe
Prior art date
Application number
PCT/EP2002/005063
Other languages
German (de)
English (en)
Other versions
WO2002095420A3 (fr
Inventor
Robert Schmidt
Hans-Jörg Florenz
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
Priority to AU2002302604A priority Critical patent/AU2002302604A1/en
Publication of WO2002095420A2 publication Critical patent/WO2002095420A2/fr
Publication of WO2002095420A3 publication Critical patent/WO2002095420A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments

Definitions

  • the invention relates to a process connection with a housing and at least one rod or rope-shaped probe.
  • the invention relates in particular to such a process connection in which the rod-shaped or rope-shaped probe for measuring a physical variable or a state of a medium, such as e.g. whose temperature, pressure, limit or fill level serves in a container.
  • Known process connections of this type are attached to or on the container by means of a process connection device such that the rod-shaped or rope-shaped probe projects into the container.
  • a process connection device such that the rod-shaped or rope-shaped probe projects into the container.
  • the rod-shaped or rope-shaped probe is immersed in the medium.
  • the rod-shaped or rope-shaped probe itself comprises, for example, one or more metal or metallized rods which serve as electrodes.
  • the rod-shaped or rope-shaped probe can also be a cable, on the end of which projects into the container, a separate sensor element, usually an electrical transducer, for example a pressure sensor, is attached.
  • the probe or its individual rods or the electrical conductors of the cable protrude into the interior of the housing of the process connection, where they are electrically contacted.
  • the rods, the cable or its electrical conductor are fastened mechanically securely and often also in a liquid-tight and / or gas-tight manner in the housing area which faces the container or projects into it.
  • a user wishes to have such a process connection equipped with a conductive probe for detecting a limit level of the medium in the container is a switching output in addition to the measurement signal output, by means of which a pump can be switched on or off depending on the detected limit level, he usually has to dismantle the installed process connection and replace it with another device with a switching output.
  • the invention is therefore based on the object of avoiding the disadvantages mentioned above and of creating a universally usable process connection which, depending on the application, is designed in the simplest manner and is as small as possible and which is also expandable and improved in terms of safety technology for additional applications.
  • a receiving device for at least one rod-shaped or rope-shaped probe
  • the pot-shaped housing on its side facing away from the process has a standardized fastening device and can be closed there.
  • the essential idea of the invention is to provide a relatively simple process connection for at least one rod-shaped or rope-shaped probe, which can be used per se for the intended application, for example as a level indicator, but which can be connected to additional and via a standardized fastening device in its container-facing area can be combined with a further additional housing or a further device.
  • a further preferred embodiment of the invention therefore relates to a process connection, the cup-shaped housing of which is closed and supplemented by a second housing which accommodates an electronic circuit.
  • a process connection it is provided that an electronic circuit is also accommodated in its cup-shaped housing.
  • Yet another embodiment of the invention relates to a process connection in which the second housing has at least one cable bushing through which a cable that is used to transmit measurement and / or switching signals is led out of the second housing.
  • Such an embodiment is particularly advantageous in the case of a permanently installed process connection according to the invention, which has, for example, a cable bushing for a test line outlet. If an additional switching output is later desired, a second housing with such a switching output is simply connected to the cup-shaped housing according to the invention via the standardized fastening device.
  • the additional switching output is achieved without the process connection already installed having to be replaced. It is only expanded as requested. This is particularly important when connecting a process to a pressurized container or to a container with a dangerous medium that must not be released into the atmosphere. If the receiving device for the probe is designed to be gastight and pressure-tight in the usual way, it is not necessary to depressurize the container or to drain the medium or to dismantle or replace the installed process connection.
  • the originally assembled process connection after The invention can remain on the container and is only supplemented by an additional housing attached to the process connection.
  • cables carrying measurement signals are routed through the cable bushing in the second housing and switching signals are routed through the cable bushing of the cup-shaped housing.
  • the particular advantage of this embodiment is that the interiors of the two housings can be designed separately from one another so that they meet EX protection regulations. This makes it possible to clearly separate the measuring line from the switching outputs, not only in terms of space but also in terms of safety.
  • connection device which can be a flange or comprises an external thread applied to a connection area.
  • Another particular advantage of the process connection according to the invention is that, in the case of a corrosive or highly corrosive medium in the container, only the part that is in contact with the interior of the container has to be made of corrosion-resistant material. During the process connection, this can be the corresponding part of the receiving device for the probe, but it can also be the entire process connection if it is very small.
  • the additional second housing can then be made of any material per se.
  • the invention makes it possible to combine housings, which are each made of a different and any material, if the requirements determined by the applications are observed. It is of course also possible to replace a second housing attached to the pot-shaped housing with another second housing at any time if this is desired or due to changed operating conditions e.g. is required.
  • Figure 1 is a schematic sectional view of a process connection according to the invention.
  • Fig. 2 is a schematic sectional view of the process connection of FIG. 1 with a second housing attached to it on a reduced scale.
  • a process connection 10 is shown according to the invention, which is fastened in a wall 20 of a container, not shown here.
  • the process connection 10 comprises a pot-shaped housing 112, the wall 114 of which encloses an interior 116.
  • a receptacle 118 for a rope or rod-shaped probe 120 is provided in the bottom of the pot-shaped housing 112, which in this exemplary embodiment consists of three rods 122 which protrude into the interior 116 of the pot-shaped housing 112.
  • the rods 122 are metallic rods and, in the application of the process connection 10 illustrated here, serve, for example in the sense of a conductive probe, as electrodes for detecting a limit level of a medium located in the container but not shown here for reasons of simplification.
  • the measuring principle of such conductive probes is known per se, it is therefore not explained in more detail here.
  • the exemplary embodiment shown here shows three rod-shaped electrodes, but it can also be only two electrodes or also more than three for other conductive measurements without restricting the invention. It is also conceivable to equip the inventive process connection 10 with other rod-shaped probes, for example for capacitive measurements, or to use it for other rope-shaped measuring probes.
  • the process connection according to the invention can comprise a rope-shaped cable, at the lower end of which protrudes as deeply as possible into the container and the medium, a pressure measuring element for hydrostatic determination of a fill level of the medium is attached.
  • the invention is versatile in this point and is not limited to the applications shown or described.
  • the receptacle 118 of the pot-shaped housing 112 is preferably not only used for the sufficient mechanical fastening of the rod-shaped (120) or rope-shaped probe, but is also designed to be as liquid-tight and better still gas-tight as possible to prevent that Medium from the Containers either in a liquid or in a gaseous state into the pot-shaped housing 112 and from there possibly into the atmosphere.
  • the process connection 10 is fastened in the wall 20 of the container by means of a process connection device 124, this process connection device 124 preferably being a screw connection, as illustrated in FIG. 1, in which the cup-shaped housing 112 is provided with an external thread in the area of the process connection device 124 and in a corresponding internal thread is screwed into the wall 20 of the container.
  • the process connection device is a flange connection, not shown here, another suitable connection device, e.g. Adhesive or press-in devices that are as liquid-tight as possible and, if the application requires, also gas-tight.
  • Adhesive or press-in devices that are as liquid-tight as possible and, if the application requires, also gas-tight.
  • the sealing means required for this purpose are not shown in the process connection device 124 illustrated in FIG.
  • the pot-shaped housing 112 is provided with a first cable bushing 126, which in the exemplary embodiment of the invention shown in FIG. 1 is closed by a cover, which is not shown here.
  • the first cable bushing 126 is designed in a manner known per se. Cable bushings do not always have to be provided with blind plugs by the manufacturer, but can also be ones in which a delivery opening provided in wall 114 is still closed by housing material, but is prepared so that, if necessary, the opening in wall 114 can be made by breaking out the closure.
  • the rods 122 of the probe 120 of the process connection 10 are, as usual, connected in the interior of the pot-shaped housing 112 to electrical conductors, not shown here, which are combined in a cable 136, shown here in broken lines, and from the interior 116 through the first cable bushing 126 are brought out.
  • a cable is used, for example, to forward measurement signals present at the probe 120 to a control room or other device used for process control.
  • a standardized fastening device 130 is provided on the side of the process connection 10 facing away from the container, that is to say on its side 128 facing away from the process.
  • this can be a thread onto which a first screw cover 132 provided with a corresponding thread is screwed, which thus closes the pot-shaped housing 112.
  • an O-ring seat 134 can also be provided in the region of a sealing shoulder of the first screw cover 132, as shown in FIG. 1.
  • the arrangement of a standardized fastening device 130 illustrated in FIG. 1 on the pot-shaped housing 112 and the corresponding thread of the first screw cover 132 is selected as an example.
  • FIG. 2 shows a further embodiment of the process connection 10 according to FIG. 1. Identical elements and components of the process connection 10 are identified by the same reference symbols.
  • the process connection in FIG. 2 is expanded by a second housing 212.
  • the second housing 212 is preferably provided with a thread corresponding to the standardized thread 130 (see FIG. 1) and is instead of the first screw cover 132 (see FIG. 1) on the side facing away from the container 20 128 screwed onto the cup-shaped housing 112.
  • the desired thread pairing by means of an internal thread in the cup-shaped housing 112 and an external thread on a corresponding part of the screw cover.
  • a wide variety of thread shapes and types can also be used, provided that they guarantee the desired mechanical properties and / or meet the requirements imposed on tightness. It is also conceivable to use other types of fastenings, such as, for example, adhesive connections, press-in connections, those with fastening clips or also those with adapters, which are arranged between the pot-shaped housing 114 and the second housing 212. This makes the Process connection 10 possible with almost all common housings of field measuring devices as second housing 212.
  • a wall 214 of the second housing 212 encloses an interior space 216 which serves to receive a first electronic circuit 218.
  • the second housing has a cable bushing 226, through which a cable 236 shown here in broken lines, which is connected, for example, to the first electronic circuit 218, is led out.
  • the second housing 212 is preferably a customary standard housing for field measuring devices in process measurement technology and, as is customary in the case of these, is closed by a second cover 232, preferably a screw-on cover.
  • the first electronic circuit 218 can either be connected to the probe 120, i.e. be conductively connected to the individual rods 122 of the probe or, as indicated in FIG. 2, is electrically connected to a second electronic circuit 238 in the pot-shaped housing 112, for example via a plug connection 240. Electrical conductors from the first and / or from the second Electronics circuit 218 and 238 are combined in cable 236, which establishes a connection to a higher-level unit in the field or to the control room. If separate cables for measuring signal lines and for switching outputs are desired, in the embodiment of the process connection 10 according to the invention shown in FIG. 2, a further cable 136 can also be led out through the first cable bushing 126, similar to the illustration in FIG. 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)

Abstract

L'invention concerne un raccord procédé universel (10), comprenant un boîtier (112), une sonde filiforme ou de forme allongée et un dispositif de fixation normalisé (130), par lequel ce raccord procédé peut être étendu au moyen d'un quelconque autre boîtier (212).
PCT/EP2002/005063 2001-05-18 2002-05-08 Raccord procede WO2002095420A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002302604A AU2002302604A1 (en) 2001-05-18 2002-05-08 Process connection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001124678 DE10124678A1 (de) 2001-05-18 2001-05-18 Prozeßanschluß
DE10124678.1 2001-05-18

Publications (2)

Publication Number Publication Date
WO2002095420A2 true WO2002095420A2 (fr) 2002-11-28
WO2002095420A3 WO2002095420A3 (fr) 2003-12-11

Family

ID=7685553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/005063 WO2002095420A2 (fr) 2001-05-18 2002-05-08 Raccord procede

Country Status (3)

Country Link
AU (1) AU2002302604A1 (fr)
DE (1) DE10124678A1 (fr)
WO (1) WO2002095420A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10316299B4 (de) * 2003-04-08 2010-11-11 Endress + Hauser Gmbh + Co. Kg Messgerät zur Bestimmung und/oder Überwachung einer Prozessgröße
US7251985B2 (en) 2004-03-23 2007-08-07 Endress + Hauser Flowtec Ag Safety module and measuring arrangement with safety module
DE102004014600A1 (de) * 2004-03-23 2005-10-27 Endress + Hauser Gmbh + Co. Kg Sicherheitsmodul und Messanordnung mit Sicherheitsmodul
DE102007005897A1 (de) * 2007-02-01 2008-08-07 Endress + Hauser Wetzer Gmbh + Co Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße
EP2122306A1 (fr) * 2007-02-01 2009-11-25 Endress+Hauser Wetzer GmbH+CO. KG Dispositif permettant de déterminer et/ou de contrôler des variables de processus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0310975A2 (fr) * 1987-10-02 1989-04-12 Allen-Bradley Company, Inc. Capteur électrique avec boîtier
US5070732A (en) * 1987-09-17 1991-12-10 Square D Company Modular sensor device
DE19713754A1 (de) * 1996-04-05 1997-10-30 Gloetzl Ges Fuer Baumestechnik Bohrlochsonde
DE20014235U1 (de) * 2000-08-17 2001-01-11 Disch GmbH, 91207 Lauf Anschlußkopf mit Regler

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643026A (en) * 1985-11-12 1987-02-17 Chrysler Motors Corporation Composite fastening device
DE4233315C2 (de) * 1992-10-05 1996-07-25 Endress Hauser Gmbh Co Vorrichtung zur Befestigung eines Gehäuses
DE4234133C2 (de) * 1992-10-09 2001-09-13 Robert Seuffer Gmbh & Co Vorrichtung zur Überwachung einer physikalischen Größe
JPH0821775A (ja) * 1994-07-08 1996-01-23 Fuji Koki Seisakusho:Kk 圧力センサ
US5546804A (en) * 1994-08-11 1996-08-20 Rosemount Inc. Transmitter with moisture draining housing and improved method of mounting RFI filters
DE19724309B4 (de) * 1997-06-10 2007-01-18 Ifm Electronic Gmbh Sensorgehäuse mit Prozeßanschluß
EP0957348A1 (fr) * 1998-05-15 1999-11-17 Satchwell Control Systems Limited Capteur de mesure
EP0984248B1 (fr) * 1998-09-02 2004-06-09 Endress + Hauser GmbH + Co. KG Capteur de mesure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070732A (en) * 1987-09-17 1991-12-10 Square D Company Modular sensor device
EP0310975A2 (fr) * 1987-10-02 1989-04-12 Allen-Bradley Company, Inc. Capteur électrique avec boîtier
DE19713754A1 (de) * 1996-04-05 1997-10-30 Gloetzl Ges Fuer Baumestechnik Bohrlochsonde
DE20014235U1 (de) * 2000-08-17 2001-01-11 Disch GmbH, 91207 Lauf Anschlußkopf mit Regler

Also Published As

Publication number Publication date
DE10124678A1 (de) 2002-11-21
WO2002095420A3 (fr) 2003-12-11
AU2002302604A1 (en) 2002-12-03

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