WO2004090480A2 - Measuring apparatus for determining and/or monitoring a process parameter - Google Patents

Measuring apparatus for determining and/or monitoring a process parameter Download PDF

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Publication number
WO2004090480A2
WO2004090480A2 PCT/EP2004/003719 EP2004003719W WO2004090480A2 WO 2004090480 A2 WO2004090480 A2 WO 2004090480A2 EP 2004003719 W EP2004003719 W EP 2004003719W WO 2004090480 A2 WO2004090480 A2 WO 2004090480A2
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WO
WIPO (PCT)
Prior art keywords
sensor
union nut
connecting section
housing
neck
Prior art date
Application number
PCT/EP2004/003719
Other languages
German (de)
French (fr)
Other versions
WO2004090480A3 (en
Inventor
Amir Vahid-Yousefnia
Original Assignee
Endress+Hauser Gmbh+Co. Kg
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Application filed by Endress+Hauser Gmbh+Co. Kg filed Critical Endress+Hauser Gmbh+Co. Kg
Publication of WO2004090480A2 publication Critical patent/WO2004090480A2/en
Publication of WO2004090480A3 publication Critical patent/WO2004090480A3/en

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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
    • G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
    • 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
    • G01D11/245—Housings for sensors
    • 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

  • Measuring device for determining and / or monitoring a process variable
  • the invention relates to a measuring device for determining and / or monitoring a physical or chemical process variable of a medium, with at least one sensor that has at least one sensor neck facing away from the process, and with at least one housing that has at least one connecting section facing the process for connecting the sensor to the housing.
  • the measuring device is, for example, a
  • the process variables can also be pressure, viscosity or density e.g. trade a liquid in a container.
  • the applicant manufactures and sells measuring devices for determining the fill level under the name "Micropilot". With these measuring or field devices, a microwave signal is emitted in the direction of the medium and, for example, the fill level is calculated from the transit time of the reflected signal.
  • Such and many other measuring devices consist at least of the actual measuring sensor, in which for example the transmitter and receiver are located, and a housing, in which, for example, the evaluation electronics and a display or other communication unit are housed.
  • This modular design of the measuring device allows the housing and sensor to be exchanged separately However, it is important that the sensor and the housing have to be connected well and securely. There are several points to consider. To ensure easy interchangeability on site, the connection should be as easy as possible.
  • the built-in sensor remains rotatable so that, for example, the display unit can be aligned so that it is easily accessible to the user.
  • the sensor and the housing are connected to each other via cables and wires. Therefore, the connection should be such that the cables during assembly, if at all, not or only as little as possible.
  • the connection should also allow the interior of the sensor and housing to be sealed against environmental influences and the medium.
  • a variant is that e.g. the sensor is inserted into the housing. A threaded screw is then screwed through the housing against the sensor neck.
  • a disadvantage is that such a connection with different materials - e.g. Metal and plastic - the sensor and housing is not without problems.
  • the transition area sensor housing is usually sealed against the environment by an O-ring and e.g. mechanically fixed by a grub screw. Due to the selective one-sided pressure of the grub screw on the O-ring, a leak is usually formed on the opposite side of the O-ring. This procedure is therefore unsatisfactory.
  • Another variant is that the sensor and housing are screwed together using threads. Disadvantages are that this prevents a quick disconnection and that the rotation creates difficulties for the wiring.
  • the sensor neck and the connecting section are configured such that the sensor neck can be inserted into the connecting section, or that the connecting section can be inserted into the sensor neck, that the sensor neck and / or the connecting section has a thread engagement that a union nut is provided which can be screwed onto the threaded engagement, that a clamping ring is provided between the union nut and the threaded engagement, and that the union nut is designed such that the union nut is screwed onto the threaded engagement of the clamping ring presses against the sensor neck and / or against the connecting section.
  • the sensor neck is inserted into the connecting section or the connecting section is inserted into the sensor neck.
  • At least the other component when the sensor neck is inserted into it, has a thread engagement, that is to say an external thread.
  • the thread engagement and the union nut are designed so that the union nut is screwed onto the thread engagement.
  • the actual connection and the sensor holding connection is then established via the clamping ring.
  • This clamping ring consists for example of a metal.
  • This pressure of the clamping ring creates a friction connection that prevents it from slipping out.
  • the advantage is that this fastening affects the full extent of the inserted component and not just selectively.
  • the housing can still be rotated without any problems, for example to optimally align the display unit.
  • Another advantage is the very easy loosening of the connection, whereby loosening the union nut is sufficient.
  • different sensor and housing materials pose no difficulties.
  • the thread engagement has at least one bevel. Associated with this is an embodiment which includes that the bevel of the thread engagement has an angle of approximately 45 °. These configurations serve to press the clamping ring against the sensor neck or against the connecting section.
  • the union nut has at least one section with a smaller inner diameter than the internal thread of the union nut. On the one hand, this section can serve, before screwing, that the clamping ring cannot fall down. On the other hand, this section is a very simple embodiment, by means of which the clamping ring is pressed against the thread engagement and against the sensor neck or connecting section.
  • the union nut has at least one bevel.
  • a further embodiment includes that the union nut has a bevel in the section with the smaller inside diameter.
  • the screwing force acting parallel to the sensor axis can be optimally and concentrically deflected onto the clamping ring.
  • a further embodiment is also associated with the last two embodiments, which includes that the bevel of the union nut has an angle of approximately 45 °. With these bevels - with the union nut and with thread engagement - the narrow area is in the outer direction and the bevels open towards the interior of the sensor and housing. Due to the angle in the range of 45 °, there is above all a very good concentric force transmission and force effect on the clamping ring, which enables the sensor and housing to be fixed radially.
  • Fig. 2 another embodiment of the invention.
  • Fig. 1 shows an embodiment of the measuring device consisting of the sensor 1 and the housing 10, in which e.g. Evaluation electronics, communication electronics, interfaces, operating and display units are located.
  • Section A of FIG. 1 is shown enlarged in FIG. 1 a.
  • the sensor neck 5 is inserted into the connecting section 15 of the housing 10.
  • the sensor neck 5 and the connecting section 15 are cylindrical in the area of the connection between the sensor 1 and the housing 10.
  • the connecting section 15 therefore also has the threaded engagement 20 to which the union nut 25 is screwed.
  • This clamping ring 30 can be made of metal, for example.
  • the exertion of pressure is optimized by the configuration of the bevels 27 and 21 of the union nut 25 and the threaded engagement 20. These bevels also bring about a wide area on which the clamping ring 30 rests on the sensor neck 5. This pressure creates a friction connection between the sensor 1 and the housing 10.
  • An O-ring 40 which seals the housing 10 and the sensor 1, is located above the clamping ring 30 in the direction of the housing 10 in a correspondingly designed recess 35.
  • connection section 15 being inserted into the sensor neck 5 in the case shown.
  • This configuration is thus a mirrored version of the example in FIG. 1. Accordingly, the section 26 with a smaller inside diameter of the union nut 25 also sits on the threaded engagement 5 from the housing side, and the O-ring 40 in the recess 35 is located in FIG Direction of sensor 1 and thus in the direction of the process. LIST OF REFERENCE NUMBERS

Abstract

The invention relates to a measuring apparatus for determining and/or monitoring a process parameter, comprising a sensor (1) that is provided with a sensor neck (5), and a housing (10) which encompasses a connecting section (15). According to the invention, the sensor neck (5) and the connecting section (15) are embodied such that the sensor neck (5) can be inserted into the connecting section (15) or the connecting section (15) can be inserted into the sensor neck (5) while the sensor neck (5) or the connecting section (15) are provided with a threaded catch (20) onto which a coupling nut (25) can be screwed. A clamping ring (30) is provided between the coupling nut (25) and the threaded catch (20). The coupling nut (25) is configured in such a way that the clamping ring (30) is pressed against the sensor neck (5) and/or the connecting section (15) when the coupling nut (25) is screwed onto the threaded catch (20).

Description

Messgerät zur Bestimmung und/oder Überwachung einer Prozessgröße Measuring device for determining and / or monitoring a process variable
Die Erfindung bezieht sich auf ein Messgerät zur Bestimmung und/oder Überwachung einer physikalischen oder chemischen Prozessgröße eines Mediums, mit mindestens einem Sensor, der mindestens über einen vom Prozess abgewandten Sensorhals verfügt, und mit mindestens einem Gehäuse, das mindestens über einen dem Prozess zugewandten Verbindungsabschnitt für die Verbindung des Sensors mit dem Gehäuse verfügt. Bei dem Messgerät handelt es sich beispielsweise um einThe invention relates to a measuring device for determining and / or monitoring a physical or chemical process variable of a medium, with at least one sensor that has at least one sensor neck facing away from the process, and with at least one housing that has at least one connecting section facing the process for connecting the sensor to the housing. The measuring device is, for example, a
Füllstandmessgerät. Bei den Prozessgrößen kann es sich außer dem Füllstand beispielsweise auch um Druck, Viskosität oder um die Dichte z.B. einer Flüssigkeit in einem Behälter handeln.Level Meter. In addition to the level, the process variables can also be pressure, viscosity or density e.g. trade a liquid in a container.
Von der Anmelderin werden unter der Bezeichnung „Micropilot" Messgeräte zur Bestimmung des Füllstandes hergestellt und vertrieben. Bei diesen Messoder Feldgeräten wird ein Mikrowellensignal in Richtung des Mediums abgestrahlt und z.B. aus der Laufzeit des reflektierten Signals wird der Füllstand berechnet. Solche und auch viele andere Messgeräte bestehen zumindest aus dem eigentlichen Messsensor, in dem sich beispielsweise Sender und Empfänger befinden, und einem Gehäuse, in dem z.B. die Auswerteelektronik und eine Anzeige- oder sonstige Kommunikationseinheit untergebracht sind. Diese modulare Gestaltung des Messgerätes erlaubt es, Gehäuse und Sensor getrennt auszuwechseln. Wichtig ist jedoch, dass Sensor und Gehäuse gut und sicher miteinander verbunden werden müssen. Dabei sind mehrere Punkte zu beachten. Um eine einfache Austauschbarkeit auch vor Ort zu gewährleisten, sollte die Verbindung möglichst leicht lösbar sein. Sinnvoll ist es auch, wenn das Gehäuse gegenüber dem eingebauten Sensor verdrehbar bleibt, so dass beispielsweise die Anzeigeeinheit so ausgerichtet werden kann, dass sie für den Benutzer gut zugänglich ist. Weiterhin sind der Sensor und das Gehäuse über Kabel und Leitungen miteinander verbunden. Daher sollte die Verbindung so sein, dass die Kabel beim Zusammenbau nicht oder möglichst kaum gegeneinander verdreht werden. Die Verbindung sollte auch eine Abdichtung des Innenraums aus Sensor und Gehäuse gegenüber Umwelteinflüssen und gegenüber dem Medium erlauben.The applicant manufactures and sells measuring devices for determining the fill level under the name "Micropilot". With these measuring or field devices, a microwave signal is emitted in the direction of the medium and, for example, the fill level is calculated from the transit time of the reflected signal. Such and many other measuring devices consist at least of the actual measuring sensor, in which for example the transmitter and receiver are located, and a housing, in which, for example, the evaluation electronics and a display or other communication unit are housed., This modular design of the measuring device allows the housing and sensor to be exchanged separately However, it is important that the sensor and the housing have to be connected well and securely. There are several points to consider. To ensure easy interchangeability on site, the connection should be as easy as possible. It also makes sense if the housing The built-in sensor remains rotatable so that, for example, the display unit can be aligned so that it is easily accessible to the user. Furthermore, the sensor and the housing are connected to each other via cables and wires. Therefore, the connection should be such that the cables during assembly, if at all, not or only as little as possible. The connection should also allow the interior of the sensor and housing to be sealed against environmental influences and the medium.
Gemäß dem Stand der Technik ist eine Variante, dass z.B. der Sensor in das Gehäuse eingeführt wird. Durch das Gehäuse wird dann eine Gewindeschraube gegen den Sensorhals geschraubt. Ein Nachteil ist, dass eine solche Verbindung bei unterschiedlichen Materialien - z.B. Metall und Kunststoff - von Sensor und Gehäuse nicht unproblematisch ist. Weiterhin wird der Übergangsbereich Sensor-Gehäuse meist durch einen O-Ring gegen die Umgebung abgedichtet und z.B. durch einen Gewindestift mechanisch fixiert. Durch den punktuellen einseitigen Druck des Gewindestifts auf den O- Ring bildet sich meist auf der gegenüberliegenden Seite des O-Ringes eine undichte Stelle. Somit ist dieses Verfahren durchaus unbefriedigend. Eine weitere Variante ist, dass Sensor und Gehäuse mittels Gewinden ineinander verschraubt werden. Nachteilig ist, dass dies ein schnelles Trennen verhindert und dass das Drehen Schwierigkeiten für die Verkabelung bereitet.According to the prior art, a variant is that e.g. the sensor is inserted into the housing. A threaded screw is then screwed through the housing against the sensor neck. A disadvantage is that such a connection with different materials - e.g. Metal and plastic - the sensor and housing is not without problems. Furthermore, the transition area sensor housing is usually sealed against the environment by an O-ring and e.g. mechanically fixed by a grub screw. Due to the selective one-sided pressure of the grub screw on the O-ring, a leak is usually formed on the opposite side of the O-ring. This procedure is therefore unsatisfactory. Another variant is that the sensor and housing are screwed together using threads. Disadvantages are that this prevents a quick disconnection and that the rotation creates difficulties for the wiring.
Somit ist es Aufgabe der Erfindung, eine einfache Verbindung zwischen Sensor und Gehäuse zu ermöglichen, die die Nachteile des Standes der Technik überwindet.It is therefore an object of the invention to enable a simple connection between the sensor and the housing, which overcomes the disadvantages of the prior art.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Sensorhals und der Verbindungsabschnitt derartig ausgestaltet sind, dass der Sensorhals in den Verbindungsabschnitt einführbar ist, oder dass der Verbindungsabschnitt in den Sensorhals einführbar ist, dass der Sensorhals und/oder der Verbindungsabschnitt über einen Gewindeeingriff verfügt, dass eine Überwurfmutter vorgesehen ist, die an den Gewindeeingriff anschraubbar ist, dass ein Klemmring zwischen der Überwurfmutter und dem Gewindeeingriff vorgesehen ist, und dass die Überwurfmutter derartig ausgestaltet ist, dass ein Anschrauben der Überwurfmutter an den Gewindeeingriff den Klemmring gegen den Sensorhals und/oder gegen den Verbindungsabschnitt drückt. Zunächst wird also der Sensorhals in den Verbindungsabschnitt oder der Verbindungsabschnitt wird in den Sensorhals eingeführt. Mindestens das jeweils andere Bauteil, also z.B. der Verbindungsabschnitt, wenn der Sensorhals in ihn eingeführt wird, weist einen Gewindeeingriff, also ein Außengewinde auf. Der Gewindeeingriff und die Überwurfmutter sind so ausgestaltet, dass die Überwurfmutter auf den Gewindeeingriff geschraubt wird. Die eigentliche und den Sensor haltende Verbindung kommt dann über den Klemmring zustande. Dieser Klemmring besteht beispielsweise aus einem Metall. Durch das Anschrauben der Überwurfmutter wird der Klemmring gegen den Gewindeeingriff und gegen den Sensorhals oder gegen den Verbindungsabschnitt gedrückt. Letzteres hängt davon ab, ob der Sensorhals in den Verbindungsabschnitt oder ob der Verbindungsabschnitt in den Sensorhals eingeführt worden ist. Es dürfte der fachlich qualifizierten Person jedoch leichtfallen, sich entsprechend wirkende Ausgestaltungen zu überlegen. Durch diesen Druck des Klemmrings ergibt sich eine Reibeverbindung, die ein Herausrutschen verhindert. Der Vorteil liegt darin, dass diese Befestigung auf den vollem Umfang des eingeführten Bauteils wirkt und nicht nur punktuell. Weiterhin kann immer noch das Gehäuse problemlos gedreht werden, um z.B. die Anzeigeeinheit optimal auszurichten. Ein Vorteil ist auch das sehr leichte Lösen der Verbindung, wobei ein Anlockern der Überwurfmutter ausreicht. Weiterhin bereiten unterschiedliche Materialien von Sensor und Gehäuse keinerlei Schwierigkeiten.The object is achieved in that the sensor neck and the connecting section are configured such that the sensor neck can be inserted into the connecting section, or that the connecting section can be inserted into the sensor neck, that the sensor neck and / or the connecting section has a thread engagement that a union nut is provided which can be screwed onto the threaded engagement, that a clamping ring is provided between the union nut and the threaded engagement, and that the union nut is designed such that the union nut is screwed onto the threaded engagement of the clamping ring presses against the sensor neck and / or against the connecting section. First, the sensor neck is inserted into the connecting section or the connecting section is inserted into the sensor neck. At least the other component, for example the connecting section, when the sensor neck is inserted into it, has a thread engagement, that is to say an external thread. The thread engagement and the union nut are designed so that the union nut is screwed onto the thread engagement. The actual connection and the sensor holding connection is then established via the clamping ring. This clamping ring consists for example of a metal. By screwing on the union nut, the clamping ring is pressed against the thread engagement and against the sensor neck or against the connecting section. The latter depends on whether the sensor neck has been inserted into the connecting section or whether the connecting section has been inserted into the sensor neck. However, it should be easy for the professionally qualified person to think of correspondingly effective configurations. This pressure of the clamping ring creates a friction connection that prevents it from slipping out. The advantage is that this fastening affects the full extent of the inserted component and not just selectively. Furthermore, the housing can still be rotated without any problems, for example to optimally align the display unit. Another advantage is the very easy loosening of the connection, whereby loosening the union nut is sufficient. Furthermore, different sensor and housing materials pose no difficulties.
Eine vorteilhafte Ausgestaltung sieht vor, dass der Gewindeeingriff mindestens eine Abschrägung aufweist. Damit verbunden ist eine Ausgestaltung, die beinhaltet, dass die Abschrägung des Gewindeeingriffs einen Winkel von ungefähr 45° aufweist. Diese Ausgestaltungen dienen dazu, dass der Klemmring gegen den Sensorhals, bzw. gegen den Verbindungsabschnitt gedrückt wird. Eine vorteilhafte Ausgestaltung sieht vor, dass die Überwurfmutter mindestens einen Abschnitt mit einem geringeren Innendurchmesser als das Innengewinde der Überwurfmutter aufweist. Dieser Abschnitt kann zum einen vor dem Verschrauben dazu dienen, dass der Klemmring nicht herunterfallen kann. Zum anderen ist dieser Abschnitt eine sehr einfache Ausgestaltung, durch die der Klemmring gegen den Gewindeeingriff und gegen Sensorhals oder Verbindungsabschnitt gedrückt wird.An advantageous embodiment provides that the thread engagement has at least one bevel. Associated with this is an embodiment which includes that the bevel of the thread engagement has an angle of approximately 45 °. These configurations serve to press the clamping ring against the sensor neck or against the connecting section. An advantageous embodiment provides that the union nut has at least one section with a smaller inner diameter than the internal thread of the union nut. On the one hand, this section can serve, before screwing, that the clamping ring cannot fall down. On the other hand, this section is a very simple embodiment, by means of which the clamping ring is pressed against the thread engagement and against the sensor neck or connecting section.
Eine vorteilhafte Ausgestaltung sieht vor, dass die Überwurfmutter mindestens eine Abschrägung aufweist. Eine weitere Ausgestaltung beinhaltet, dass die Überwurfmutter in dem Abschnitt mit dem geringeren Innendurchmesser eine Abschrägung aufweist. Durch diese Ausgestaltungen der Abschrägungen beim Gewindeeingriff, bzw. bei der Überwurfmutter kann die parallel zur Sensorachse wirkende Schraubkraft optimal und konzentrisch auf den Klemmring abgelenkt werden. Mit den letzten beiden Ausgestaltungen ist auch eine weitere Ausgestaltung verbunden, die beinhaltet, dass die Abschrägung der Überwurfmutter einen Winkel von ungefähr 45° aufweist. Bei diesen Abschrägungen - bei der Überwurfmutter und beim Gewindeeingriff - befindet sich jeweils der enge Bereich in Außenrichtung und die Abschrägungen öffnen sich in Richtung des Innenraums von Sensor und Gehäuse. Durch den Winkel im Bereich von 45° findet vor allem eine sehr gute konzentrische Kraftübertragung und Kraftwirkung auf den Klemmring statt, die eine radiale Fixierung von Sensor und Gehäuse ermöglicht.An advantageous embodiment provides that the union nut has at least one bevel. A further embodiment includes that the union nut has a bevel in the section with the smaller inside diameter. Through these configurations of the bevels during thread engagement or with the union nut, the screwing force acting parallel to the sensor axis can be optimally and concentrically deflected onto the clamping ring. A further embodiment is also associated with the last two embodiments, which includes that the bevel of the union nut has an angle of approximately 45 °. With these bevels - with the union nut and with thread engagement - the narrow area is in the outer direction and the bevels open towards the interior of the sensor and housing. Due to the angle in the range of 45 °, there is above all a very good concentric force transmission and force effect on the clamping ring, which enables the sensor and housing to be fixed radially.
Eine vorteilhafte Ausgestaltung beinhaltet, dass eine Aussparung imAn advantageous embodiment includes that a recess in the
Sensorhals und/oder im Verbindungsabschnitt für einen O-Ring vorgesehen ist. Dies ermöglicht die Abdichtung des Sensors und des Gehäuses z.B. gegenüber dem Eindringen des Mediums. Die Erfindung wird anhand der nachfolgenden Zeichnungen näher erläutert. Es zeigt:Sensor neck and / or is provided in the connecting section for an O-ring. This enables the sealing of the sensor and the housing e.g. against the penetration of the medium. The invention is illustrated by the following drawings. It shows:
Fig. 1 : eine Ausgestaltung der Verbindung von Sensor und Gehäuse; Fig. 1 a: eine Vergrößerung eines Abschnitts der Fig. 1 ; und1: an embodiment of the connection of sensor and housing; 1 a: an enlargement of a portion of FIG. 1; and
Fig. 2: eine andere Ausgestaltung der Erfindung.Fig. 2: another embodiment of the invention.
Fig. 1 zeigt eine Ausgestaltung des Messgerätes bestehend aus dem Sensor 1 und dem Gehäuse 10, in dem sich z.B. Auswertelektronik, Kommunikationselektronik, Schnittstellen, Bedien- und Anzeigeeinheiten befinden. Vergrößert ist in Fig. 1 a der Abschnitt A der Fig. 1 dargestellt. In dieser Ausgestaltung ist der Sensorhals 5 in den Verbindungsabschnitt 15 des Gehäuses 10 eingeführt. Der Sensorhals 5 und der Verbindungsabschnitt 15 ist im hier gezeigten Fall im Bereich der Verbindung von Sensor 1 und Gehäuse 10 zylindrisch ausgeführt. Der Verbindungsabschnitt 15 weist daher auch den Gewindeeingriff 20 auf, an den die Überwurfmutter 25 angeschraubt ist. Durch das Befestigen der Überwurfmutter 25 an dem Gewindeeingriff 20 wird Druck auf den Klemmring 30 ausgeübt. Dieser Klemmring 30 kann beispielsweise aus Metall bestehen. Die Druckausübung wird optimiert durch die Ausgestaltung der Abschrägungen 27 und 21 der Überwurfmutter 25 und des Gewindeeingriffs 20. Diese Abschrägungen bewirken auch eine breite Fläche, an der der Klemmring 30 an dem Sensorhals 5 anliegt. Durch diesen Druck wird eine Reibeverbindung zwischen dem Sensor 1 und dem Gehäuse 10 geschaffen. Oberhalb des Klemmrings 30 in Richtung des Gehäuses 10 befindet sich in einer entsprechend ausgebildeten Aussparung 35 ein O-Ring 40, der das Gehäuse 10 und den Sensor 1 abdichtet.Fig. 1 shows an embodiment of the measuring device consisting of the sensor 1 and the housing 10, in which e.g. Evaluation electronics, communication electronics, interfaces, operating and display units are located. Section A of FIG. 1 is shown enlarged in FIG. 1 a. In this embodiment, the sensor neck 5 is inserted into the connecting section 15 of the housing 10. In the case shown here, the sensor neck 5 and the connecting section 15 are cylindrical in the area of the connection between the sensor 1 and the housing 10. The connecting section 15 therefore also has the threaded engagement 20 to which the union nut 25 is screwed. By fastening the union nut 25 to the threaded engagement 20, pressure is exerted on the clamping ring 30. This clamping ring 30 can be made of metal, for example. The exertion of pressure is optimized by the configuration of the bevels 27 and 21 of the union nut 25 and the threaded engagement 20. These bevels also bring about a wide area on which the clamping ring 30 rests on the sensor neck 5. This pressure creates a friction connection between the sensor 1 and the housing 10. An O-ring 40, which seals the housing 10 and the sensor 1, is located above the clamping ring 30 in the direction of the housing 10 in a correspondingly designed recess 35.
Fig. 2 zeigt eine weitere Ausgestaltung der Verbindung, wobei im gezeigten Fall der Verbindungsabschnitt 15 in den Sensorhals 5 eingeführt wird. Diese Ausgestaltung ist also quasi eine gespiegelte Ausführung des Beispieles in Fig. 1. Dementsprechend sitzt der Abschnitt 26 mit geringerem Innendurchmesser der Überwurfmutter 25 auch von der Gehäuseseite her auf dem Gewindeeingriff 5 auf, und der O-Ring 40 in der Aussparung 35 befindet sich in Richtung des Sensors 1 und somit in Richtung des Prozesses. Bezugszeichenliste2 shows a further embodiment of the connection, the connection section 15 being inserted into the sensor neck 5 in the case shown. This configuration is thus a mirrored version of the example in FIG. 1. Accordingly, the section 26 with a smaller inside diameter of the union nut 25 also sits on the threaded engagement 5 from the housing side, and the O-ring 40 in the recess 35 is located in FIG Direction of sensor 1 and thus in the direction of the process. LIST OF REFERENCE NUMBERS
Sensor Sensorhals Gehäuse Verbindungsabschnitt Gewindeeingriff Abschrägung des Gewindeeingriffs Überwurfmutter Abschnitt mit geringerem Innendurchmesser der Überwurfmutter Abschrägung der Überwurfmutter Klemmring Aussparung O-Ring Sensor Sensor neck Housing Connection section Thread engagement Bevel of the thread engagement Union nut Section with a smaller inside diameter of the union nut Bevel of the union nut Clamping ring Recess O-ring

Claims

Patentansprüche claims
1. Messgerät zur Bestimmung und/oder Überwachung einer physikalischen oder chemischen Prozessgröße eines Mediums, mit mindestens einem Sensor (1 ), der mindestens über einen vom Prozess abgewandten Sensorhals (5) verfügt, und mit mindestens einem Gehäuse (10), das mindestens über einen dem Prozess zugewandten Verbindungsabschnitt (15) für die Verbindung des Sensors (1 ) mit dem1. Measuring device for determining and / or monitoring a physical or chemical process variable of a medium, with at least one sensor (1), which has at least one sensor neck (5) facing away from the process, and with at least one housing (10), which has at least one a connecting section (15) facing the process for connecting the sensor (1) to the
Gehäuse (10) verfügt, dadurch gekennzeichnet, dass der Sensorhals (5) und der Verbindungsabschnitt (15) derartig ausgestaltet sind, dass der Sensorhals (5) in den Verbindungsabschnitt (15) einführbar ist, oder dass der Verbindungsabschnitt (15) in den Sensorhals (5) einführbar ist, dass der Sensorhals (5) und/oder der Verbindungsabschnitt (15) über einen Gewindeeingriff (20) verfügt, dass eine Überwurfmutter (25) vorgesehen ist, die an den Gewindeeingriff (20) anschraubbar ist, dass ein Klemmring (30) zwischen der Überwurfmutter (25) und dem Gewindeeingriff (20) vorgesehen ist, und dass die Überwurfmutter (25) derartig ausgestaltet ist, dass ein Anschrauben der Überwurfmutter (25) an den GewindeeingriffHousing (10), characterized in that the sensor neck (5) and the connecting section (15) are designed such that the sensor neck (5) can be inserted into the connecting section (15), or that the connecting section (15) into the sensor neck (5) it can be inserted that the sensor neck (5) and / or the connecting section (15) has a threaded engagement (20), that a union nut (25) is provided which can be screwed onto the threaded engagement (20), that a clamping ring (30) is provided between the union nut (25) and the threaded engagement (20), and that the union nut (25) is designed such that the union nut (25) is screwed onto the threaded engagement
(20) den Klemmring (30) gegen den Sensorhals (5) und/oder gegen den(20) the clamping ring (30) against the sensor neck (5) and / or against the
Verbindungsabschnitt (15) drückt.Connection section (15) presses.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Gewindeeingriff (20) mindestens eine Abschrägung (21 ) aufweist. 2. Device according to claim 1, characterized in that the threaded engagement (20) has at least one bevel (21).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Abschrägung (21 ) des Gewindeeingriffs (20) einen Winkel von ungefähr 45° aufweist.3. Device according to claim 2, characterized in that the bevel (21) of the threaded engagement (20) has an angle of approximately 45 °.
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Überwurfmutter (25) mindestens einen Abschnitt (26) mit einem geringeren Innendurchmesser als das Innengewinde der Überwurfmutter (25) aufweist.4. The device according to claim 2 or 3, characterized in that the union nut (25) has at least one section (26) with a smaller inner diameter than the internal thread of the union nut (25).
5. Vorrichtung nach Anspruch 1 , 2, 3 oder 4, dadurch gekennzeichnet, dass die Überwurfmutter (25) mindestens eine Abschrägung (27) aufweist.5. The device according to claim 1, 2, 3 or 4, characterized in that the union nut (25) has at least one bevel (27).
6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Überwurfmutter (25) in dem Abschnitt (26) mit dem geringeren Innendurchmesser eine Abschrägung (27) aufweist.6. The device according to claim 4, characterized in that the union nut (25) in the section (26) with the smaller inner diameter has a bevel (27).
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Abschrägung (27) der Überwurfmutter (25) einen Winkel von ungefähr 45° aufweist.7. The device according to claim 5 or 6, characterized in that the bevel (27) of the union nut (25) has an angle of approximately 45 °.
8. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass eine Aussparung (35) im Sensorhals (5) und/oder im Verbindungsabschnitt (15) für einen O-Ring (40) vorgesehen ist. 8. The device according to claim 1, characterized in that a recess (35) is provided in the sensor neck (5) and / or in the connecting section (15) for an O-ring (40).
PCT/EP2004/003719 2003-04-08 2004-04-07 Measuring apparatus for determining and/or monitoring a process parameter WO2004090480A2 (en)

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DE2003116299 DE10316299B4 (en) 2003-04-08 2003-04-08 Measuring device for determining and / or monitoring a process variable
DE10316299.2 2003-04-08

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WO2004090480A3 WO2004090480A3 (en) 2005-02-10

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DE10316299A1 (en) 2004-10-28
WO2004090480A3 (en) 2005-02-10

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