SENSOR DEVICE FOR DETECTING A LEAKAGE

Abstract

The invention relates to a sensor device for detecting a leakage, in particular for a water-bearing household appliance, the sensor device comprising a base device and a detector device, the detector device being arranged on the base device by means of at least one first releasable non-positive and/or positive connection, the detector device detecting a change in an electrical parameter in a measuring chamber or a measuring element of the base device, the detector device having a first housing which can be closed in a sealed manner and in which a self-sufficient power supply device and a circuit arrangement are arranged, the circuit arrangement comprising a communication device.

Claims

1. A sensor device for detecting a leakage, in particular for a water-bearing household appliance, wherein the sensor device comprises a base device and a detector device, wherein the detector device is arranged on the base device by means of at least a first releasable non-positive and/or positive connection, the detector device detecting a change in an electrical parameter in a measuring chamber and/or a measuring element of the base device, the detector device having a first housing which can be closed in a sealing manner and in which a self-sufficient power supply device and a circuit arrangement are arranged, the circuit arrangement comprising a communication device.

2. The sensor device according to claim 1, wherein the first housing of the detector device extends along a height axis Z, a width axis X and a longitudinal axis Y, the first housing of the detector device comprising a first housing element which has, at least in sections, a polygonal, in particular an octagonal, base surface, wherein a carrier device with two opposite sides is arranged in the first housing element, wherein the self-sufficient power supply device is arranged on a first side of the carrier device, wherein the circuit arrangement is predominantly arranged on a second side of the carrier device.

3. The sensor device according to claim 2, wherein the first housing of the detector device comprises a second housing element which is arranged on the first housing element by means of a second non-positive and/or positive connection, the first housing element and the second housing element comprising an opening mechanism for easier release of the second non-positive and/or positive connection, wherein the first housing element comprises at least one web element extending along the height axis Z, wherein the second housing element comprises at least one chamfered elevation, wherein upon rotational movement of the second housing element relative to the first housing element, the at least one chamfered elevation slides along the at least one web element thereby pushing the second housing element away from the first housing element along the height axis Z.

4. The sensor device according to claim 1, wherein the electrical parameter is an electrical resistance and/or an electrical capacitance, the detector device comprising at least two sensing elements for detecting the electrical parameter, the sensing elements being electrically connected to the circuit arrangement, the at least two sensing elements each being mechanically and electrically connected to the carrier device by means of a spring element.

5. The sensor device according to claim 1, wherein two first non-positive and/or positive connections are provided between the base device and the detector device, wherein these first non-positive and/or positive connections are snap connections, wherein the first non-positive and/or positive connections each comprise a head element and a receiving element, wherein the head element is detachably fixed in the respective receiving element in the manner of a push button, wherein the head elements are arranged on the detector device and the receiving elements are arranged on the base device or vice versa, wherein the sensing elements are integrated in the head elements or the receiving elements, wherein the head elements and the receiving elements consist of an electrically conductive material.

6. The sensor device according to claim 5, wherein the base device comprises a second housing, the receiving elements or the head elements being arranged on the second housing.

7. The sensor device according to claim 6, wherein the measuring element is a belt element or a clamping element, the belt element or the clamping element serving as a first fastening means for the sensor device to a water-bearing element, the belt element or the clamping element being arranged on the second housing.

8. The sensor device according to claim 1, wherein the base device comprises only the measuring element, wherein the measuring element is a belt element or a clamping element.

9. The sensor device according claim 7, wherein the belt element or the clamping element comprises at least two conducting tracks along their longitudinal extension, one conducting track in each case being electrically connected to one sensing element in each case, the electrical parameter being given between the at least two conducting tracks, wherein the belt element consists of a textile material which has a lower conductivity than the conducting tracks, wherein the belt element comprises fastening sections by means of which a hook and loop connection can be made.

10. The sensor device according to claim 9, wherein a standard element is connected between the conducting tracks or between the receiving elements, which standard element predetermines a standard value of the electrical parameter, the standard element being a resistance element, it being possible to check the at least one first non-positive and/or positive connection by measuring the standard value.

11. The sensor device according to claim 1, wherein the base device comprises a receiving element which spatially delimits the measuring chamber at least in sections and is suitable for and intended to receive the detector device, the receiving element being arranged on a first section of a liquid collecting device which can be arranged on an underside of a household appliance, the receiving element comprising two arm elements which engage in sections around the detector device and hold it by means of a third non-positive and/or positive connection.

12. The sensor device for detecting a leakage, in particular for a water-bearing household appliance, wherein the sensor device comprises a base device and a detector device, the detector device being arranged on the base device by means of at least one first releasable non-positive and/or positive connection, the detector device detecting a change in an electrical parameter in a measuring element of the base device, the detector device having a first housing which can be closed in a sealed manner and in which a self-sufficient power supply device and a circuit arrangement are arranged, a standard element being provided which specifies a standard value of the electrical parameter, the standard element being a resistance element, it being possible to check the at least one first non-positive and/or positive connection by measuring this standard value.

13. The system comprising a water-bearing household appliance and at least one sensor device according to claim 1.

14. The system according to claim 11, wherein a liquid collecting device is arranged on an underside of the household appliance the liquid collecting device comprising a central first section which is displaceable forwards in a drawer-like manner relative to the two outer second sections along a longitudinal direction Y′.

15. The system according to claim 13, wherein at least the central first section of the liquid collecting device is arranged on the household appliance in such a way that it has a forward slope along the longitudinal direction Y′ of the household appliance, at least one receiving element with the detector device being arranged at a front end of the first section along the longitudinal direction Y′.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Show in the figures:

[0047] FIG. 1 a perspective view of a sensor device according to one embodiment;

[0048] FIG. 2 a schematic sketch of the circuit arrangement;

[0049] FIG. 3 a perspective view of a sensor device according to one embodiment with an opened first housing;

[0050] FIG. 4 a perspective view of a sensor device according to one embodiment with an opened first housing;

[0051] FIG. 5 a sectional view of a sensor device according to one embodiment;

[0052] FIG. 6 a sectional view of a sensor device according to one embodiment;

[0053] FIG. 7 a perspective view of a sensor device according to one embodiment;

[0054] FIG. 8 a perspective view of a sensor device according to one embodiment, wherein the detector device is separate from the base device;

[0055] FIG. 8a a perspective view of a sensor device according to one embodiment, wherein only the base device is shown;

[0056] FIG. 8b a perspective view of a sensor device according to one embodiment, wherein only the base device is shown;

[0057] FIG. 9 a perspective view of a sensor device according to one embodiment, wherein the detector device is separate from the base device;

[0058] FIG. 10 a perspective view of a sensor device according to one embodiment, which is arranged on an element;

[0059] FIG. 11 a sectional view of a sensor device according to one embodiment, which is arranged on an element;

[0060] FIG. 12 a sectional view of a sensor device according to one embodiment;

[0061] FIG. 13 a perspective view of a measuring element;

[0062] FIG. 14 a perspective view of a measuring element;

[0063] FIG. 15 a section of a measuring element;

[0064] FIG. 16 a perspective view of a liquid collecting device;

[0065] FIG. 17 a section of a liquid collecting device;

[0066] FIG. 18 a top view of a liquid collecting device;

[0067] FIG. 19 a section of a liquid collecting device;

[0068] FIG. 20 a section of a household appliance;

[0069] FIG. 21 a household appliance with a liquid collecting device;

[0070] FIG. 22 a top view of a liquid collecting device with conducting tracks.

DETAILED DESCRIPTION

[0071] FIGS. 1 to 12, 18, 19 and 21 show a sensor device 1 for detecting a leakage, in particular for a water-bearing household appliance 100, the sensor device 1 comprising a base device 2 and a detector device 3, the detector device 3 being arranged on the base device 2 by means of at least one first releasable non-positive and/or positive connection, the detector device 3 detecting a change in an electrical parameter in a measuring chamber 4 and/or a measuring element 5 of the base device 2, the detector device 3 having a first housing 6 which can be closed in a sealed manner and in which a self-sufficient power supply device 7 and a circuit arrangement 8 are arranged, the circuit arrangement 8 comprising a communication device 9.

[0072] According to the figures shown, the base device 2 comprises a second housing 29. However, it is also conceivable that the base device 2 does not comprise a second housing 29 and only comprises a measuring element 5 in the form of a belt element 5a.

[0073] The household appliance 100 extends along a height axis Z′, a width axis X′ and a longitudinal axis Y′. The sensor device 1 for leakage detection for a water-bearing household appliance 100 extends along a height axis Z, a width axis X and a longitudinal axis Y. Accordingly, the first housing 6 and the second housing 29 extend along the height axis Z, the width axis X and the longitudinal axis Y.

[0074] The first housing 6 of the detector device 3 comprises a first housing element 10 which has, at least in sections, a polygonal, in particular an octagonal base surface. The first housing element 10 comprises a plate-like base wall 10a, which is polygonal, in particular octagonal. Starting from the base wall 10a, a first side wall 10b extends along the height axis Z, which has side faces 10c, which in turn are aligned in accordance with the base surface. The side faces 10c thus extend in a polygonal shape, in particular an octagonal shape, corresponding to the base surface. This configuration facilitates the insertion and retention of the detector device 3 in a receiving element 24, as shown in FIGS. 18, 19 and 21. The first side wall 10b merges into a second side wall 10d, which is circular in shape. Furthermore, the first housing 6 of the detector device 3 comprises a second housing element 12. The second housing element 12 has a circular plate-like base wall 12a, from which a third side wall 12b extends along the height axis Z. The second housing element 12 is thus circular in shape. The second housing element 12 is thus of lid-like design.

[0075] The second housing element 12 is arranged along the height axis Z on the first housing element 10 by means of a second non-positive and/or positive connection. In a closed state of the detector device 3, the third side wall 12b of the second housing element 12 encloses the second side wall 10d of the first housing element 10. The second non-positive and/or positive connection is a snap connection. For this purpose, at least one annular circumferential protrusion 31 is arranged on an inner surface of the third side wall 12b. On an outer surface of the second side wall 10d there is also at least one annular protrusion 32. The two annular protrusions 31, 32 can be continuous or have interruptions or gaps. If the second housing element 12 is pressed onto the first housing element 10, the third side wall 12b deforms elastically, causing the protrusion 31 to slide or “snap” over the other protrusion 32. FIG. 6 further shows that a further annular protrusion 30 is provided on an inner surface of the base wall 12b of the second housing element 12. In a closed state of the detector device 3, this protrusion 30 rests against an upper edge 33 of the second side wall 10d. A sealing closure of the first housing 6 is thus made possible. Optionally, further sealing elements may be provided between the first housing element 10 and the second housing element 12.

[0076] To facilitate the disengagement of the second non-positive and/or positive connection, the first housing element 10 and the second housing element 12 comprise an opening mechanism. For this purpose, at least one, preferably two, web element(s) 13 extending along the height axis Z is provided in the first housing element 10. Furthermore, at least one, preferably two, chamfered elevation(s) 14 is provided on an inner surface of the base wall 12a of the second housing element 12. The at least one protrusion 14 extends along a peripheral direction U. Thereby, the extension of the at least one protrusion 14 along the height axis Z increases with the course along the peripheral direction U. During a rotational movement of the second housing element 12 relative to the first housing element 10, the at least one chamfered elevation 14 slides along the at least one web element 13. Due to the increasing height of the projection 14 along the peripheral direction U, the second housing element 12 is pressed away from the first housing element 10 along the height axis Z, whereby the second non-positive and/or positive connection is then released.

[0077] A carrier device 11 with two opposite sides is arranged, preferably fixed, in the first housing element 10. The carrier device 11 is designed in the form of a board or PCB (printed circuit board). The self-sufficient power supply device 7 is arranged on a first side 11a, which is directed towards the second housing element 12. The circuit arrangement 8 is predominantly arranged on or on the second side 11b of the carrier device 11. The two-sided assembly of the circuit board has the advantage that the detector device 3 can be built much more compactly. The power supply device 7 is described below as a battery. Of course, the present invention is not limited to this embodiment. In FIG. 3 it can be seen that the battery 7 is held in a holder. The battery 7 is replaceable if required. The orientation of the first side 11a with the battery 7 towards the second housing element 12 has the advantage that if the first housing 6 is opened, the battery 7 is easily accessible and replaceable.

[0078] The circuit arrangement 8 may comprise the communication device 9 and a measuring and comparison device 34. FIG. 2 shows a schematic sketch of some possible components of the circuit arrangement. It is also conceivable that a control device is provided which controls the components. Of course, other components are also conceivable. FIG. 2 also shows a monitoring device 35 for monitoring the charge level of the battery 7. This can inform the user that it is necessary to change the battery 7. The communication device 9 is suitable and intended for establishing and/or operating a wireless communication link 28 with the household appliance 100 or with a second communication device 27 of the household appliance 100. However, it would also be conceivable for a wireless communication link 28 to be established and/or operated with another communication device, for example a smartphone, a computer, etc. The wireless communication link 28 may be a Bluetooth® link, a Bluetooth® low energy link, an RFID (radio-frequency identification) link, an NFC (near field communication) link, a WLAN link, a mobile phone link, or a combination of said links.

[0079] The measured electrical parameter can be an electrical resistance and/or an electrical capacity. In the following, only the case that the electrical parameter is an electrical resistance will be discussed without limitation to the generality. The detector device 3 comprises at least two sensing elements 15 for detecting the electrical parameter. The sensing elements 15 are electrically connected to the circuit arrangement 8 or the measuring and comparison device 34. The sensing elements 15 protrude from the base wall 10a of the first housing element 10 and are spaced apart from each other. In the sectional views in FIGS. 6 and 12, it can be seen that a sensing element 15 is integrated in a head element 17 in each case. The head element 17 comprises a first cup-like element 36 which is integrated into the base wall 10a. This could be done, for example, by overmoulding in an injection moulding process. By integrating the cup-like element 36 or the head element 17 in this way, the first housing 6 is sealed against the penetration of a liquid. The cup-like element 36 or the head element 17 consist of an electrically conductive material, for example a metal. The cup-like element 36 has the sensing element 15 inserted into it or firmly connected to it. The cup-like element 36 can have an opening at its front end along the height axis Z, in which the sensing element 15 is arranged in a sealing manner. The at least two sensing elements 15 are each mechanically and electrically connected to the carrier device 11 by means of a spring element 16. Due to the tensioning by the spring elements 16, a particularly good electrical contact of the sensing elements 15 with the carrier device 11 or the circuit arrangement 8 is ensured. Furthermore, the mechanical pressure of the sensing elements 15 against the cup-like elements 36 generated by the spring elements 16 results in an improved electrical contact between these elements as well as a sealing of the opening in the cup-like elements 36.

[0080] According to one embodiment, which is shown in FIGS. 7 to 15, two first non-positive and/or positive connections are provided between the base device 2 and the detector device 3. These first non-positive and/or positive connections are designed as snap connections, in particular as push-button connections, and each comprise a head element 17 and a receiving element 18. The head element 17 can be detachably fixed in the respective receiving element 18 in the manner of a push-button. For this purpose, the head element 17 has a circumferential thickening or a diameter decreasing along the height axis Z in the direction of the first housing 6. The thickening or the section with the larger diameter pushes an elastic element in the receiving element 18 to the side or deforms it during insertion. After complete insertion, the elastic element relaxes to its original position and is now arranged along the height axis Z above the thickening. This holds the head element 17 in position. Since both the head elements 17 and the receiving elements 18 are made of an electrically conductive material, a particularly simple connection is provided which ensures both a sufficiently mechanically firm connection and an electrical connection between the detector device 3 and the base device 2. In the present case, the head elements 17 are arranged on the first housing 6 and the receiving elements 18 are arranged on the second housing 29 of the base device 3, or are integrated into it. However, a reverse arrangement is also conceivable.

[0081] In the present embodiment, the measuring element 5 is designed as a belt element 5a. However, it would also be conceivable to use a clamping element or another fastening element. The belt element 5a serves both as a measuring element 5, on which or with the aid of which the measurement of the electrical parameter is carried out, and as a first fastening means 5b for the sensor device 1, for fastening to a water-bearing element 19. This can, for example, be a hose, a pipe or also a connection for a hose or the like. FIGS. 13 to 15 show such a belt element 5a in detail. Two conducting tracks 21 are integrated in the belt element 5a along its longitudinal extension 20. The belt element 5a is made of a textile material which has a lower conductivity than the conducting tracks 21 and can absorb liquid to a certain degree. The conducting tracks 21 are electrically connected to the two sensing elements 15 so that the electrical parameter is measured in the form of a resistance value between the two conducting tracks 21. In a dry state, a predetermined value is measured. As soon as a leakage occurs, liquid hits the measuring element 5 or the belt element 5a. Since liquids generally have a lower resistance than, for example, a textile material, the measured resistance value between the two conducting tracks 21 decreases due to the influence of the liquid. It should be emphasised that a significant change in the electrical parameter is only caused by a sufficient amount of liquid. Occurring moisture due to condensation will usually not lead to such a significant change of the electrical parameter. This avoids a possibly faulty triggering due to usually unproblematic condensation moisture.

[0082] The belt element 5a can be easily and flexibly attached to the water-bearing element 19 by means of a hook and loop fastener. For this purpose, the belt element 5a has two fastening sections 22a, 22b. A first fastening section 22a is provided with barbs or mushroom heads (marked “hooks” in FIG. 13) which engage with the fleece material (marked “soft” in FIG. 13) of the second fastening section 22b and thus create a hook and loop connection.

[0083] The belt element 5a or the measuring element 5 belongs to the base device 3. The belt element 5a is guided through a socket 37 of the second housing 29 so that it is mechanically fixed to the belt element 5a. The second housing 29 is designed in such a way that the two receiving elements 18 are connected to the two conducting tracks 21 in an articulated manner. The sensing elements 15 are electrically connected to the conducting tracks 21 by the electrically conductive print head connection.

[0084] A standard element 23 can be connected between the conducting tracks 21 or the receiving elements 18, which defines a standard value of the electrical parameter. The standard element 23 is a resistance element. Thus, at least the first frictional and/or positive connection can be checked by measuring the known standard value. The first non-positive and/or positive connection in the form of the push-button connection also represents an electrical connection, as already described. If the push-button connection is complete, the standard resistance value plus a resistance value of the leads can be measured. If the connection is incomplete, on the other hand, a much higher resistance value is present.

[0085] FIG. 8a shows an embodiment in which the standard element 23 is designed as an electrical component. The standard element 23 is connected between the two receiving elements 18. Furthermore, the standard element 23 is arranged within the second housing 29. FIG. 8b shows an embodiment in which the standard element 23 is designed as an electrical component. The standard element 23 is connected between the two conducting tracks 21. Furthermore, the standard element 23 is arranged on the belt element 5a. FIG. 12 also shows a standard element 23 in the form of a resistor element which is connected between the two conducting tracks 21.

[0086] As explained above, the belt element 5a may be formed of a first textile material. The resistance element may further be formed as an electrically conductive second textile material in the belt element 5a, which is introduced as a section in the first textile material of the belt element 5a. The conductivity of the second textile material is different from the conductivity of the first textile material. The second textile material thus has the functionality of an electrical component arranged between the conducting tracks 21. This is indicated in FIG. 15. Of course, a combination of the mentioned arrangements of the standard element 23 would also be conceivable.

[0087] According to a further embodiment, shown in FIGS. 16 to 19 and 21, the base device 2 comprises a receiving element 24 which spatially delimits the measuring chamber 4 at least in sections. The receiving element 24 is suitable and intended for receiving the detector device 3. The receiving element 24 comprises two arm elements 24a, 24b which enclose the detector device 3 in sections and hold it by means of a third non-positive and/or positive connection. The receiving element 24 is thereby arranged on a first section 25 of a liquid collecting device 26. Such a liquid collecting device 26 can be arranged on an underside of the household appliance 100. The first section 25 of the liquid collecting device 26 is plate-shaped and extends along a longitudinal axis Y′ of the household appliance 100. Further, the first section 26 comprises a front end 25a along the longitudinal axis Y′, which is at the front end 26a of the liquid collecting device 26. These front ends 25a, 26a are provided at the front end of the household appliance 100. An end wall 38 extending along the height axis Z′ is provided at this front end 26a. The two arm elements 24a, 24b are arranged on this end wall 38 in such a way that they have a certain elasticity. For insertion and removal of the detector device 3, the two arm elements 24a, 24b can be elastically displaced and/or deformed. The arm elements 24a, 24b thereby engage the first side wall 10b and the side faces 10c, respectively. The polygonal, in particular octagonal, orientation of the side faces 10c ensures a particularly good hold.

[0088] According to the present embodiment, the base device 2 thus comprises the first section 25 of the liquid collecting device 26 with the receiving element 24. Advantageously, the detector device 3 can be operated unchanged both with this base device 2 and with the base device 3 described in FIGS. 7 to 12. The base device 2 according to FIGS. 16 to 19 and 21 provides a measuring chamber 4 instead of a measuring element 5, in which the change of the electrical parameter is measured. The measuring chamber 4 is bounded on the underside by the plate-like first section 25 of the liquid collecting device 26. The measuring chamber 4 is bounded on the upper side by the base wall 10a of the first housing element 10. The measuring chamber 4 is bounded on the side by the end wall 38 and the two arm elements 24a, 24b. An opening 43 is provided between the arm elements 24a, 24b through which the leaked liquid can enter the measuring chamber 4. The opening 43 is also necessitated by the possibility of removing the detector direction 3. The sensing elements 15, which, as described, are integrated in the head elements 16, project into the measuring chamber 4. By designing the head elements 16 in the form of the cup-like elements 36, the detector device 3 is sealed with respect to the liquid in the measuring chamber 4. A change in the electrical parameter, in this case a resistance value, is determined as soon as the two sensing elements 15 make contact with the liquid in the measuring chamber 4. Due to the high conductivity of the liquid, a drop in the measured resistance is measured.

[0089] The liquid collecting device 26 or only the first section 25 of the liquid collecting device 26 are arranged on the household appliance 100 in such a way that they have a slope along the longitudinal axis Y′ towards the front end 26a, towards the receiving element 24 and/or towards the measuring chamber 4. This means that even a small amount of leaked liquid can be fed to the measuring chamber 4.

[0090] The first section 25 of the liquid collecting device 26 is arranged centrally between two outer second sections 27, as can be seen for example in FIG. 16. Furthermore, the liquid collecting device 26 can be moved forward in a drawer-like manner relative to the two outer second sections 27 along a longitudinal direction Y′. For this purpose, a corresponding bearing mechanism 39 is provided on the liquid collecting device 26. The fluid device further comprises four side walls 40 which extend along the height axis Z′ and are connected to the outer second sections 27. Furthermore, two stabilising elements 41 are provided which are connected to the outer second sections 27. The central first section 25 is displaceable under the stabilising elements 41 and the front and rear side walls 40.

[0091] According to a further embodiment as shown in FIG. 22, the base device 2 comprises a receiving element 24 which is arranged on a liquid collecting device 26. This receiving element 24 can be designed analogously to the receiving element 24 according to the embodiment in FIGS. 16 to 19 and 21. The liquid collecting device 26 is provided with at least two conducting tracks 42. In each case, one conducting track 42 is electrically connected to a respective sensing element 15, so that the electrical parameter between the at least two conducting tracks 42 can be measured. The conducting tracks 42 extend along the longitudinal axis Y′ of the liquid collecting device 26. The conducting tracks may extend along the entire length of the liquid collecting device 26 or only along a section of the length of the liquid collecting device 26. The measurement of the electrical parameter may be provided between the conducting tracks 42 and preferably cumulatively additionally in the measuring chamber 4. The conducting tracks 42 may be formed analogously to the embodiment according to FIGS. 7 to 15.

[0092] FIG. 20 shows a system 200 comprising a water-bearing household appliance 100 and at least one sensor device 1. The household appliance 100 is only shown in sections. The household appliance 100 may be a dishwasher, a washing machine or any other water-bearing household appliance. The household appliance 100 comprises a housing 103 and a container means provided therein, into which the items to be washed are insertable. The housing 103 of the household appliance 100 is preferably cubic or cuboid in shape. Preferably, the household appliance 100 has at least three side walls. The housing 103 may comprise two lateral side walls. Further, the housing 103 may comprise a rear side wall. Finally, the housing 103 may comprise a front side wall. Furthermore, the household appliance comprises a closure device by means of which the container device can be closed. The closure device may, for example, take the form of a door which is integrated into the front side wall or is provided instead of a front side wall. Operating elements for the user can be provided on the front side wall and/or on the locking device. Such controls are, for example, programme selector switches. The household appliance 100 may further comprise a second communication device 27, which communicates with the communication device 9 of the at least one sensor device 1. Furthermore, a liquid collecting device 26 is arranged on the one underside of the household appliance 100.

[0093] The household appliance 100 can have at least one inlet and at least one outlet, which are not shown in FIG. 20. An embodiment with inlets, such as a cold water inlet and a hot water inlet, would be conceivable. This system 200 would therefore comprise a total of six sensor devices 1. The first sensor device 1 would be attached to or near the building connection for the hot water inlet by means of a belt element 5, 5a. The second sensor device 1 would be attached to or near the appliance connection of the household appliance 100 for the hot water supply by means of a belt element 5, 5a. The third sensor device 1 would be attached at or near the building connection for the cold water supply by means of a belt element 5, 5a. The fourth sensor device 1 would be attached to or near the appliance connection of the household appliance 100 for the cold water inlet by means of a belt element 5, 5a. The fifth sensor device 1 would be attached at or near the building connection for the drain by means of a belt element 5, 5a. The sixth sensor device 1 would be mounted in the liquid collecting device 26 by means of a receiving element 24.

[0094] Each of the six sensor devices 1 can communicate with the second communication device 44 of the household appliance 100 or another communication device when a leak is detected. An identification message is included in the transmitted message so that the receiver can quickly trace the corresponding sensor device 1 and thus the location of the leakage. The household appliance 100 may comprise a display device for displaying the leakage or the battery level of the sensor devices 1. It is also conceivable that the household appliance 100 sends corresponding messages to a user device, for example a smartphone.

[0095] The applicant reserves the right to claim all features disclosed in the application documents as essential to the invention, provided they are individually or in combination new compared to the prior art. It is further pointed out that the individual figures also describe features which may be advantageous in themselves. The skilled person immediately recognises that a certain feature described in a figure can also be advantageous without adopting further features from this figure. Furthermore, the skilled person recognises that advantages can also result from a combination of several features shown in individual figures or in different figures.

LIST OF REFERENCE SIGNS

[0096] 1 Sensor device [0097] 2 Base device [0098] 3 Detector device [0099] 4 Measuring chamber [0100] 5 Measuring element [0101] 5a Belt element [0102] 5b First fastening means [0103] 6 first housing [0104] 7 Power supply device or battery [0105] 8 Circuit arrangement [0106] 9 Communication device [0107] 10 First housing element [0108] 10a Base wall of the first housing element [0109] 10b First side wall [0110] 10c Side faces of the first side wall [0111] 10d Second side wall [0112] 11 Carrier device [0113] 11a first side of the carrier device [0114] 11b second side of the carrier device [0115] 12 Second housing element [0116] 12a Base wall of the second housing element [0117] 12b Third side wall [0118] 13 Web element [0119] 14 chamfered elevation [0120] 15 Sensing element [0121] 16 Spring element [0122] 17 Head element [0123] 18 Receiving element [0124] 19 Water-bearing element [0125] 20 Longitudinal extension of the measuring element/belt element [0126] 21 Conducting track [0127] 22a first fastening section [0128] 22b second fastening section [0129] 23 Standard element [0130] 24 Receiving element [0131] 24a, 24b Arm elements [0132] 25 first section of the liquid collecting device [0133] 25a Front end of the first section [0134] 26 Liquid collecting device [0135] 26a Front end of the liquid collecting device [0136] 27 second section of the liquid collecting device [0137] 28 Wireless connection [0138] 29 Second housing [0139] 30 Protrusion [0140] 31 Protrusion [0141] 32 Protrusion [0142] 33 Upper edge of the second side wall [0143] 34 Measuring and comparison device [0144] 35 Monitoring device [0145] 36 Cup-like element [0146] 37 Socket for the second housing [0147] 38 End wall [0148] 39 Bearing mechanism [0149] 40 Side walls [0150] 41 Stabilising elements [0151] 42 Conducting track [0152] 43 Opening [0153] 44 Second communication device [0154] 100 Household appliance [0155] 103 Housing [0156] 200 System [0157] U Peripheral direction [0158] Y Longitudinal axis of the sensor device [0159] X Width axis of the sensor device [0160] Z Height axis of the sensor device [0161] Y′ Longitudinal axis of the household appliance [0162] X′ Width axis of the household appliance [0163] Z′ Height axis of the household appliance