DE102009002055A1 - Measuring device and method for mounting the measuring device - Google Patents

Abstract

Measuring device with a sensor for determining at least one chemical and / or physical measurand of a process having a first connection part and a second connection part for producing a particular releasable mechanical connection of the sensor to a dip tube, wherein the first connection part facing in a measuring operation to the process End of the dip tube can be fastened, wherein the second connection part is attachable to the sensor, wherein the second connection part is attachable to the first connection part and the first connection part has at least a first latching means which engages first latching means in a second latching means of the second connection part, and thereby produces a positive connection between the first and the second connecting part.

Description

The The invention relates to a measuring device with a sensor for determining at least one chemical and / or physical Measured variable of a process.

moreover The invention relates to a method for assembling such Measuring device.

Sensors are used to determine various chemical and / or physical parameters, for example, the concentration of different substances, the pH and / or the turbidity of a medium. Such sensors often have a housing with an elongated body and a sensor element. The medium is located in a container such. As a reactor, a basin or a channel. Such sensors are used, for example, to control a process via suitable process parameters. In this context, for example, from the published patent application DE 102006058069 A1 and the CH 673895 A5 Retractable fittings or static fittings become known.

Around the sensor in the running in the container process to make it in contact with the fluid comes, often a dip tube is used. The sensor is attached to one end of the dip tube and the Dip tube lowered into the container with the medium.

Of the In particular, the sensor can be detachably attached to or in the immersion tube be arranged. To attach the sensor to the dip tube, it is common in the prior art, a cylindrical Screw the inner part to one end of the dip tube. The inner part has a collar on which collar a nut is raised. At this union nut is then the Threaded sensor screwed.

By the dip tube is the sensor via a cable connected. About the cable, the sensor to the energy required for its operation. In addition, process-relevant data, In particular, measured values or measurement signals are transmitted. At the other end of the dip tube is a transmitter for processing the transmitted measurement signals and / or for transmitting the measured values to a control room or control room.

For the installation or assembly of the measuring device in particular the Inner part and the union nut are u. a. also tools such as As spanner in different sizes required.

Farther is the known from the prior art connection between dip tube and sensors due to the angular shape of the inner part and the union nut little for a use bspw. suitable in settling tanks, as it is due to the angular shape silting and / or tearing occurs. These tinklings can, for example, arise through fibers that surround the dip tube, the Loop the connecting parts and / or the sensor.

moreover It may be during installation by screwing on the sensor on the dip tube to twists of that located in the dip tube Cable come, which twists to cable damage and in extreme cases lead to a cable break.

Of the Invention is therefore based on the object, a connection between Dive tube and sensor to suggest, which easy to assemble is and causes low maintenance.

The The object is achieved by a measuring device and a method for mounting the measuring device solved.

Regarding the measuring device according to the invention is characterized solved that a first connecting part and a second Connecting part are provided, and for producing a particular releasable mechanical connection of the sensor serve a dip tube, wherein the first connecting part to a in a measuring operation the process facing end of the dip tube is fastened, wherein the second connecting part to the sensor is fastened, wherein the second connecting part to the first connecting part is attachable and the first connecting part at least a first Locking means comprises, which first locking means in a second locking means engages the second connection part, and thereby a form-fitting Making connection between the first and the second connecting part.

By attaching the second connecting part to the first connecting part and producing the latching connection, a simple and rapid, in particular tool-free, mounting of the measuring device can take place. In addition, the first and the second connecting part can be adapted to the geometry of the sensor and in particular have a line shape which avoids a clogging. By the engagement of the locking means, the sensor can, for example, be attached to the dip tube during a measuring operation. Through the proposed connection system, a variety different sensors with a certain ease of use, ie easily and be introduced in a relatively short time in the process.

In an embodiment of the measuring device is the second connecting part from the side facing the process during measurement operation to the first one Connecting part attachable. The second connection part can advantageously be infected from the process-side end of the dip tube ago. As a result, the handling in particular the installation of the measuring device simplified, since a dip tube can be in particular several meters long and in particular the attachment of the union nut used in the prior art is labor intensive. When changing the sensor or a maintenance, especially cleaning, the measuring device is therefore not as in the known from the prior art compound necessary a union nut when changing the sensor over to pull the entire dip tube. Rather, now a change of Sensor or maintenance of the measuring device simply on the process side End of the dip tube are made.

In a further embodiment of the measuring device is the first Locking means of a latching nose, which in the second locking means of the second connection part engages. In one embodiment of the measuring device has the second locking means on a latching hook, in which the only locking means of the first connection part engages. By this particular complementarily formed locking means can be a safe Connection of the sensor to be made with the dip tube, which can not solve itself independently.

In an embodiment of the measuring device is the second connecting part in connection with the first connecting part to the concentric Alignment of the sensor with the dip tube. By the proposed Alignment of the sensor to the dip tube can cause pigtail formation be further reduced because, for example, by an existing in the process Flow especially stripped fibrous deposits easier can be. The particular cylindrical second connecting part can then be plugged into the first connector, where it is the Dip tube partially overlapped, especially on the dip tube rests, and thereby aligned with the dip tube.

In an embodiment of the measuring device is the sensor through a running in the dip tube cable is connected to a transmitter. The cable can be used to transmit measurement signals, in particular Measurements serve and with a sensor, especially in a Waiting to be connected.

In An embodiment of the measuring device is the first connection part to the dip tube, in particular to an internal thread of the dip tube, screwed. At the first connecting part can, for example, an external thread be provided, which external thread in an internal thread the dip tube is screwed. In addition, the first connection part have a collar which formed at the end of the dip tube Paragraph strikes, with the collar of the first connection part does not protrude beyond the edge of the measuring tube, but rather is arranged in alignment with the dip tube. The first connection part can be aligned by screwing on the dip tube.

The first connection part may additionally include a sealant, for example. in the form of a sealing ring, which sealant in one is mounted on the first connecting part provided groove. The sealant may be part of a sealing step, which sealing step is the penetration of the medium formed by in the compound and within prevents the connection lying cavities. The sealing level can by pushing the second connecting part on the first Joining part are formed, with which pushing the second Connecting part at least partially overlaps the first connecting part and thereby sealing the connection at the sealing stage the medium is completed. As a result, the measuring device after taken from a measuring operation from the process and the connection between Immersion tube and sensor are easily solved. By the sealing stage can also prevent the medium from entering a possibly at the end of the dip tube introduced plug contact avoided so that no interference of the plug contact he follows.

In an embodiment of the measuring device is the second connecting part to the sensor, in particular to an external thread the plug part of the sensor, can be screwed. The particular elongated sensor can be an external thread which, to an internal thread of the second connecting part can be screwed.

Under other by the specified arrangement of the thread is a narrow, d. H. little protruding beyond the diameter of the dip tube, Connection between dip tube and sensor is achieved, so that For example, pigtail formation can at least be reduced.

In a further embodiment of the measuring device, the second connecting part is rotatable about its longitudinal axis in the locked state. This allows the transducer without the cable too to twist on the second connecting part by the second connecting part is rotated around the sensor while the sensor remains in a fixed position.

In an embodiment of the measuring device, the first connecting part a tubular body and in an end region a plurality of webs separated from each other by a gap, which Webs in particular arranged axially symmetrical and through a gap are separated from each other. The webs can in particular lie on the circumference of a common circle. These webs can for receiving the sensor and on its inside For example, have a thread to which the sensor are screwed can. Furthermore, the first locking means may be provided on the webs be.

In an embodiment of the measuring device have at least two in particular diametrically opposed webs a detent on. Due to the symmetrical attachment of the locking lugs, the second connecting part and thereby also the sensor with the dip tube in particular be aligned concentrically.

In an embodiment of the measuring device acts a slope of the second connecting part with at least one latching lug of the first Connecting parts by moving the second connection part along the longitudinal axis of the dip tube together and serves the connection between the first and the second connecting part to solve. In one embodiment of the measuring device at least the one locking lug having webs by moving the second connecting part along the longitudinal axis of the Immersion tube compressed to release the connection. The connection can be solved by passing through the slope, the locking lugs and located on the locking lugs webs inside pressed to the common with the dip tube longitudinal axis become.

In an embodiment of the measuring device is the first connection part for receiving a plug connection between a plug part of Cable and a plug part of the sensor. After manufacturing the connector, the sensor can only at the same time Twisting the cable to be rotated about its longitudinal axis. By screwing the rotatably mounted second connecting part this can be avoided on the sensor.

In an embodiment of the measuring device is the plug part of Sensor at least partially in the first connection part einbringbar, in particular screwed, and the webs are through the introduction of the plug part of the sensor spread. By Spreading the bars, the connection becomes additional fixed.

Regarding of the method, the object according to the invention solved that a particular releasable mechanical Connection of a sensor for determining at least one chemical and / or physical measure of a process is provided on a dip tube, and that a first connecting part at an end of the dip tube facing the process in a measuring operation is attached, that a second connecting part to the first connecting part is infected, wherein the first and the second connecting part form fit be connected to each other, and that the sensor on the second connecting part is attached.

In an embodiment of the method, the sensor with the second connecting part connected by the second connecting part is screwed to the sensor.

The Invention will become apparent from the following drawings explained. It shows:

1 a section through the longitudinal axis of a first connecting part and a second connecting part,

2 : a section through a connection between dip tube and sensor and

3 : a section through another connection between dip tube and sensor.

1 shows a section through the longitudinal axis 8th a first and a second connecting part 1 . 2 , The first and the second connecting part 1 . 2 have a substantially hollow cylindrical body and the first connecting part 1 At least partially in the second connecting part 2 be introduced, since the outer radius of the first connecting part 1 in a partial area of the first connecting part 1 is smaller than the inner radius of the second connecting part 2 in a partial area of the second connecting part 2 ,

The first connection part 1 points to the end with which it enters the dip tube 21 is screwed, an external thread 3 on. The external thread 3 acts with one in the dip tube 21 cut internal thread 23 together. At its other end, the first connecting part 1 several bars 6 on, which are separated by a gap. On the outside of the first connection part 1 is also a federal government 4 provided, which covenant 4 perpendicular to the longitudinal axis 8th of the main body and what collar 4 in the dip tube 21 screwed in first connecting part 1 in alignment with the lateral surface of the dip tube 21 is arranged. On the outside of the first connection part 1 is also between the external thread 3 and the jetties 6 one consisting of a groove radially extending bracket 5 for a sealing ring 32 intended.

The second connecting part 2 points to the to the first connection part 1 facing side an area for receiving the webs 6 of the first connection part 1 on. In addition, the second connecting part 2 an internal thread 7 on, to which the sensor 22 can be screwed.

2 shows a section through the connection between the dip tube 21 and the sensor 22 , The section runs through the longitudinal axis 9 of the dip tube 22 to which the first and the second connecting part 1 . 2 and the. sensor 22 are aligned coaxially. By screwing in the first connection part 1 is the first link 1 on the dip tube 21 attached. To make the connection is only a standard tool, eg. As a screwdriver or Allen key, necessary, which tool through at least one hole 24 in a jetty 6 of the first connection part 1 inserted and used as a knob for screwing in the first connection part.

The bridges 6 of the first connection part 1 run concentric to the longitudinal axis 9 over the process end of the dip tube 21 out and are separated by a gap. At these bridges 6 , or to the at least webs 6 provided first locking means 10 , becomes the second connecting part 2 infected. In 2 is the second connecting part 2 to the first connection part 1 infected and the locking lugs 10 of the first connection part 1 are in the locking hooks 11 of the second connecting part 2 engaged.

To make the connection, the second connecting part 2 on the first connection part 1 deferred and those at the jetties 6 provided latching lugs 10 glide over a first slope of a latching hook 11 of the second connecting part 2 , After overcoming the first slope, the detents snap 10 and can not be removed without tools. After locking an independent release of the connection is no longer possible.

After the second connecting part 2 to the first connection part 1 is infected, the second connecting part 2 on the sensor 22 attached. The sensor 22 becomes the second connection part 2 fastened by this around its longitudinal axis 8th rotatably mounted second connecting part 2 by means of its internal thread 7 to an external thread 36 of the sensor 22 is screwed. The sensor 22 it remains in the position in which he in the first and second connection part 1 . 2 was introduced while the second connecting part 2 around the sensor 21 turned around and thereby screwed on.

3 shows a section through another connection between the dip tube 21 and the sensor 22 , In the dip tube 21 is a cable 31 arranged over which cable 31 the sensor 22 with a transmitter, not shown, in particular in a waiting room is connectable. A plug 33 of the cable 31 is in a designated area of the first connection part 1 stored. The plug 33 of the cable 31 is through the first connection part 1 in the dip tube 21 centered. Furthermore, the plug 33 of the cable 31 with a suitable plug 34 of the sensor 22 connected. The plug 34 of the sensor 22 is also in the first connection part 1 housed and is with the plug 33 of the cable 31 connected. The plug connection may be. in particular to act a connection to the inductive signal transmission of measurement signals.

The sensor 22 has a connecting part with a first and a second external thread 35 . 36 on, with the first external thread 35 has a smaller outer diameter than the second outer thread 36 , The first external thread 35 serves to the webs 6 of the first connection part 1 to spread, ie to push apart to secure the latching connection, ie the engagement of the first and second connecting means 1 . 2 hedge by the first connecting part 1 with the second connecting part 2 is axially clamped. By screwing in the sensor 22 or by inserting the plug of the sensor 22 can the locking connection so axially braced and secured.

The second connecting part 2 is on the sensor 22 screwed by the second connecting part 2 around its longitudinal axis 8th is rotated while dip tube 21 , first connection part 1 and sensors 22 can remain rigid in a fixed position.

For disassembly of the measuring device is first the second connecting part 2 from the sensor 22 unscrewed and the sensor 22 decreased. The second connecting part 2 can then along the longitudinal axis 9 continue in the direction of the dip tube 21 be pushed until at least two with locking lugs 10 provided bars 6 of the first connection part 1 over the locking lugs 10 with a slope 12 of the second connecting part 2 cooperating and thus be bent sufficiently far to each other to the locking lugs 10 from the locking hooks 11 to solve and to a Hilfswerkzeug, not shown, to set. The auxiliary tool is, for example, tubular and has an outer diameter which is smaller than the inner diameter of the first and second connecting part 1 . 2 , so that the auxiliary tool in the second connecting part 1 can be inserted and the mutually curved webs 6 be held. The second connecting part 2 can then be deducted via the aid.

1

first plug part

2

second plug part

3

external thread first plug part

4

Federation

5

bracket for sealing ring

6

web

7

inner thread

8th

longitudinal axis dip tube

9

longitudinal axis first / second connecting part

10

locking lug

11

latch hook

12

slope

21

dip tube

22

sensor

23

inner thread dip tube

31

electric wire

32

seal

33

plug of the cable

34

plug of the sensor

35

first thread

36

second thread

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006058069 A1 [0003]
• - CH 673895 A5 [0003]

Claims (15)

Measuring device with a sensor ( 22 ) for determining at least one chemical and / or physical measurand of a process, having a first connecting part ( 1 ) and a second connecting part ( 2 ) for producing a particularly detachable mechanical connection of the sensor ( 22 ) on a dip tube ( 21 ), wherein the first connecting part ( 1 ) at an end of the dip tube facing the process in a measuring operation ( 21 ) is fastened, wherein the second connecting part ( 2 ) on the sensor ( 22 ) is fastened, wherein the second connecting part ( 22 ) to the first connection part ( 1 ) is attachable and the first connection part ( 1 ) at least one first latching means ( 10 ), which first latching means ( 10 ) in a second latching means ( 11 ) of the second connecting part ( 2 ) engages, and thereby a positive connection between the first and the second connecting part ( 1 . 2 ). Measuring device according to the preceding claim, characterized in that the second connecting part ( 2 ) from the side facing the process during measuring operation to the first connecting part ( 2 ) is attachable. Measuring device according to one of the preceding claims, characterized in that the first latching means ( 10 ) from a catch ( 10 ), which in the second latching means ( 11 ) of the second connecting part ( 2 ) engages. Measuring device according to one of the preceding claims, characterized in that the second latching means ( 11 ) a latching hook ( 11 ), in which the first locking means ( 10 ) of the first connection part ( 1 ) engages. Measuring device according to one of the preceding claims, characterized in that the second connecting part ( 2 ) in connection with the first connection part ( 1 ) for concentric alignment of the sensor ( 22 ) with the dip tube ( 21 ) serves. Measuring device according to one of the preceding claims, characterized in that the second connecting part ( 2 ) in the locked state about its longitudinal axis ( 8th ) is rotatable. Measuring device according to one of the preceding claims, characterized in that the first connecting part ( 1 ) has a tubular base body and in one end region a plurality of webs separated from one another by a gap (US Pat. 6 ), which webs ( 6 ) are arranged in particular axially symmetrical and separated by a gap. Measuring device according to one of the preceding claims, characterized in that at least two, in particular diametrically opposed. Footbridges ( 6 ) a catch ( 10 ) exhibit. Measuring device according to the preceding claim, characterized in that a bevel of the second connecting part ( 2 ) with at least one latching nose ( 10 ) of the first connection part ( 1 ) by moving the second connecting part ( 2 ) along the longitudinal axis ( 9 ) of the dip tube ( 21 ) and serves to connect the first and second links ( 1 . 2 ) to solve. Measuring device according to one of the preceding claims, characterized in that at least one latching lug ( 10 ) having webs ( 6 ) by moving the second connecting part ( 2 ) along the longitudinal axis ( 9 ) of the dip tube ( 21 ) are compressible, and serve to solve the connection. Measuring device according to one of the preceding claims, characterized in that the sensor ( 22 ) by a in the dip tube ( 21 ) running cable ( 31 ) is connected to a transmitter, and that the first connection part ( 1 ) for receiving a plug connection between a plug part ( 33 ) of the cable ( 31 ) and a plug part ( 34 ) of the sensor ( 22 ) serves. Measuring device according to the preceding claim, characterized in that the plug part ( 34 ) of the sensor ( 22 ) at least partially into the first connecting part ( 1 ), in particular screwable, is, and that the webs ( 6 ) by the insertion of the plug part ( 34 ) of the sensor ( 22 ) are spread. Measuring device according to one of the preceding claims, characterized in that the first connecting part ( 1 ) to the dip tube ( 21 ), in particular to an internal thread ( 23 ) of the dip tube ( 21 ), and that the second connecting part ( 2 ) to the sensor ( 22 ), in particular to an external thread ( 35 . 36 ) of the plug part of the sensor ( 22 ), can be screwed. Method for mounting a measuring device, with a particularly detachable mechanical connection of a measuring sensor ( 22 ) for determining at least one chemical and / or physical measurand of a process on a dip tube ( 21 ), characterized in that a first connecting part ( 1 ) at an end of the dip tube facing the process in a measuring operation ( 21 ), that a second connecting part ( 2 ) to the first connection part ( 1 ), wherein the first and the second connecting part ( 1 . 2 ) are positively connected to each other, and that the sensor ( 22 ) at the second connecting part ( 2 ) is attached. Method for mounting a measuring device according to the preceding claim, characterized in that the sensor ( 22 ) with the second connecting part ( 2 ) is connected by the second connecting part ( 2 ) on the sensor ( 22 ) is screwed.