TW202242366A - Method for checking the sealing of an object and leak detection device - Google Patents

Abstract

The invention relates to a method for checking the sealing of an object (11) to be tested by tracer gas using a probe (3) of a leak detection device (1) and comprising the step intended to scan the outer surface of the object (11) using the probe (3) in order to successively record, in a processing module (7) of the leak detection device (1), several values representative of the tracer gas leak rate measured by the detection device (1), each value representative of the tracer gas leak rate measured being associated with a value representative of the location of the probe (3) and the step intended to graphically represent, on a display element (9), the associated values recorded during the scanning of the outer surface of the object (11).

Description

Method and leak detection device for checking the seal of an object

The invention relates to a method and a device for checking the tightness of an object to be tested by means of a tracer gas.

So-called tracer gas "leak" tests and so-called tracer gas "spray" tests are well known for checking the tightness of objects. These methods include detection of possible leak points of tracer gas through the item to be tested to check if maintenance is required. In leak detection mode, a leak detector connected to a leak detection probe is used to search for possible tracer gas around the item to be tested filled with, usually pressurized, tracer gas. In spray mode, a spray gun or blower is used to spray tracer gas on the item to be tested, the internal volume of which is connected to a leak detector.

Finding leaks is typically performed by moving a leak detection probe or gun to discrete points on the item to be tested, particularly points that may exhibit seal weakness, such as seals, welds, and couplings. An increase in the measured tracer gas concentration value indicates a leak at the probe or gun tip. Consequently, the operator must simultaneously monitor the probe or lance as well as the display elements of the leak detection device. This step is not easy because the display element, typically a screen such as a liquid crystal display, is usually located far from the test area, requiring the operator to frequently turn his head between the display element of the leak detection device and the probe of the leak detection device department.

Due to the highly reactive behavior of the tracer gas test method, this may impair the detection quality. In fact, the operator may miss a leak detection when looking away from the screen. Also, turning the head repeatedly can make the operator uncomfortable for seal checks, especially during production. In addition, seal checking is more difficult when the probe is relatively far from the test area.

Another problem is that it is difficult for the operator to remember, on the one hand, which areas of the item have been tested, and, on the other hand, which areas were identified as leaks, especially in the case of seal checks in production, where the checks are Executed sequentially at the end of the manufacturing process. In fact, there were no visible markings on the part that could document the detection of a leak, nor the actual test area. This can be detrimental to the execution of quality checks.

Furthermore, it may then be difficult to prove that the part has indeed been tested in all the areas the customer requested to be tested. Furthermore, this prevents the user from detecting recurring problems between several parts being tested, thus failing to identify new weak areas of the part, especially in production. Another problem may be to describe the placement of the leakage area accurately enough to be able to handle it later, especially if the item to be tested has a very large size.

The purpose of the present invention is primarily to facilitate the localization and quantification of leaks in any type of object to be tested, especially in objects of any size or geometry.

To this end, the invention relates to a method for checking the tightness of an object to be tested by means of a tracer gas using the probe of a leak detection device, the method comprising the following steps: - scanning the outer surface of the object with a probe to continuously record in the processing module of the leak detection device several values representing the tracer gas leakage rate measured by the leak detection device, each value measured representing the tracer gas leakage rate associated with a value representing the position of the probe; - Graphical representation on the display element of the correlation values recorded during the scan of the outer surface of the object.

Advantageously, according to the invention, and in contrast to the usual seal measurement test at discrete points, the method uses probe scanning, i.e. the movement of the probe around the object without any pre-defined path, so that at the end of the test or as the test is performed to obtain a graphical representation that correlates the measured value of the tracer gas leak rate (ie, significantly indicative of the detected tracer gas concentration or partial pressure) with the spatial position of the probe relative to the item to be tested.

The user thus has a complete overview. Depending on the complexity of the object, the user concentrates on scanning all or part of the outer surface of the object by precisely guiding the tip of the stylus. Advantageously, according to the present invention, his or her scans are automatically positioned and continuously correlated with the measurements obtained, thus allowing a graphical display to correlate the two types of values recorded in a map (commonly called a "profile map") couplet.

Notably, the user can graphically determine the area to be inspected as a function of the scanning start area, or possibly in greater detail. In addition, the user can immediately recognize whether a part of the scanning area has been forgotten. He or she can then add additional values closer to those already performed and/or complete areas that were forgotten in the previous scan.

The invention may also comprise one or more of the following optional features alone or in combination.

The probe may be a tracer gas leak detection probe or a tracer gas jet blower (item connected to the leak detection device) connected to the leak detection device (item filled with the tracer gas).

The scanning step can be activated and/or deactivated by an actuating element mounted on the probe. As non-limiting examples, the actuation element may be a mechanical or capacitive type switch, interrupter or button. This in particular allows the user to start each test when the tip of the probe is in the desired position to start the scanning step.

During the scanning step, each time the probe is stationary for a predetermined period of time suitable for performing a measurement of a value indicative of the tracer gas leakage rate by the leak detection device, a value indicative of the measured value associated with the value indicative of the position of the probe is preferentially recorded This value for the tracer gas leak rate. Typically, the predetermined time is a function of the leak detection device and may generally be between 1 second and 10 seconds, that is to say, for example, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds or 10 seconds.

Obviously, alternatively or additionally, the measured at least one value representing the tracer gas leakage rate associated with the value representing the position of the probe can also be recorded on demand by a manual control element present, for example, on the probe, and can be initiated by the user, especially during the scanning step, to selectively increase the recording frequency of correlation values in certain regions that include more undulations, requiring significantly more values representing the position of the probe . Furthermore, assuming that the leak detection device is less reactive, that is to say, for example, has a time to perform a measurement of greater than 6 seconds, the correlation of the leak rate can also be calculated by taking into account the delays associated with the response of the leak detection device and/or the measurement time. The linear correction is imagined as a function of the position of the probe.

During the scanning step, a value representing the position of the probe may be obtained by a localization system installed in the probe, which may for example comprise geolocation means and/or inertial measurement means and/or motion detection means. Geolocation means can be of the terrestrial type, such as using GPS or the Galileo network, or of the local type, such as a dedicated network temporarily installed by the user or existing around the object used for testing , such as a wireless local area network (such as a WIFI network or a GSM network), etc., for tracking changes in the position of the probe in the network. The inertial measurement device may comprise at least one accelerometer and/or an inertial unit and/or a gyroscope, making it possible to determine the movement of the probe relative to a reference point at which the scanning step starts. Finally, the motion detection means may comprise a detector, for example of the video or ultrasound type, making it possible to determine the movement of the probe relative to the reference point at which the scanning step begins. Obviously, the change in the position of the probe can be obtained in another way without departing from the scope of the present invention. For example, a mobile phone terminal combines several of the above-mentioned devices.

During the representation step, the outer surface of the object may be displayed in two dimensions as a function of the coordinates representing each value of the position of the probe, that is to say the outer surface of the object is displayed substantially flat. The substantially planar surface exhibits identification of a value indicative of a tracer gas leak rate measured by the leak detection device. The display allows for a realistic and simple rendering of the external surface, allowing fast diagnostic analysis.

According to another variant, the outer surface of the object can be displayed in three dimensions, that is to say, the outer surface of the object is essentially displayed as a volume. These three-dimensional surfaces are displayed together with the identification of values representing the tracer gas leak rate measured by the leak detection device. This display allows for a more faithful rendering of the geometry of the exterior surface, allowing for faster diagnostic analysis.

Irrespective of the changing display of the outer surface of the object, during the representation step, the identification of the value measured by the leak detection device representing the leakage rate of the tracer gas may be made by digital interpolation, local deformation or local coloring of the displayed outer surface of the object as determined by A function of the magnitude of the value representing the tracer gas leakage rate measured by the leak detection device is realized. Thus, this identification immediately makes it possible to locate and quantify defects on the outer surface of the object.

The graphical representation can advantageously be compared to previously obtained graphics of the same article or article of the same type to identify any sealing deviations. Thus, the obtained graphical representation can be compared with a previously obtained graphical representation of the same object. Spots that are deteriorating faster than others can then be quickly diagnosed simply and quickly to take corrective action. According to another application, the obtained graphical representation can be compared with previously obtained graphical representations typically of the same type of items on the production line. Manufacturing errors can then be quickly diagnosed simply and quickly to take corrective action on the production line. According to yet another application, the obtained graphical representation can be compared with graphical representations of objects of the same type certified to meet certain standards, in order to track the maintenance of the production quality of the production line, and the test objects can also be certified as meeting certain standards.

The present invention also relates to a leak detection device, comprising a probe, a detection module, a processing module and a display element, characterized in that the detection device includes a positioning system, allowing the position of the probe to be transmitted to the processing module in real time, and the processing module Groups are configured to implement methods as described above. Typically, the processing module thus allows the continuous recording of several values representing the tracer gas leakage rate measured by the detection module of the leak detection device, each of the measured values representing the tracer gas leakage rate being correlated with the values representing the tracer gas leakage rate measured by the positioning system associated with the value of the position of the probe. The processing module also allows information related to the results of the sealing check of the object to be tested to be displayed on the display element.

In different figures, the same or similar elements have the same reference numerals, possibly with added references. The description of their structure and function has therefore not been systematically repeated.

In the following, the direction is the direction of the figure. In particular, the terms "upper", "lower", "left", "right", "upper", "lower", "forward" and "rearward" are generally to be understood with respect to the orientation of the figures.

"Item 11 to be tested" is understood to mean any object or any device for which the seal needs to be checked.

"Leak detection device 1" is understood to mean all types of devices capable of measuring the leakage rate, concentration or partial pressure of a predetermined tracer gas, such as hydrogen or helium, to identify any sealing defect of the item 11 to be tested. These types of devices typically include a probe 3, a pumping module (e.g., with a primary vacuum pump, a secondary vacuum pump, etc.), a tracer gas detection module 5 (e.g., with a mass spectrometer, etc.), a processing module 7, and preferably , display element 9. Generally, all components of the leak detection device 1 (except the probe 3 ) are combined in a detection unit 4 coupled to the probe 3 .

"Probe 3" is understood to mean all types of devices used by the leak detection device 1 for local inspection of the item to be tested. The probe 3 is thus approached by the user 6 to the object 11 to be tested. According to the invention, the probe 3 can thus be a tracer gas leak detection probe or a jet blower.

In the example shown in FIG. 1 , the probe 3 is a leak detection probe and has a gripping element which allows the user 6 to manipulate it. The leak detection probe 3 is connected to the detection unit 4 by the flexible tube 2 to suck the gas around the object 11 to be tested filled with the tracer gas. A portion of the gas drawn in by a pumping module (not shown) is analyzed by a gas detection module 5 which supplies a tracer gas leakage rate to a processing module 7 . In general, the leak rate can be measured, for example, in units of mbar∙l∙s ⁻¹ or Pa∙m ³ ∙s ⁻¹ .

In the example shown in Figure 7, the probe 3 is a jet blower or spray gun of the leak detection system 1 and has a gripping element that allows the user to manipulate it. The probe 3 is connected by tubing 2a to a tracer gas source and is actuated by a control 16 to allow the tracer gas to be released. The detection unit 4 of the leak detection system 1 is connected to the object 11 to be tested by a pipeline 2b to detect a vacuum inside the object 11 and inhale any tracer gas blown out by the probe 3, and these gases will pass through the leak of the object 11 to be tested infiltrate. A fraction of the molecules (typically the tracer gas) flowing against the gas drawn in by the pumping module is analyzed by the gas detection module 5 which supplies the tracer gas leak rate to the processing module 7 . In general, the leak rate can be measured, for example, in units of mbar∙l∙s ⁻¹ or Pa∙m ³ ∙s ⁻¹ .

Typically, the tracer gas maximum threshold is monitored by the processing module 7, and if the tracer gas maximum threshold is exceeded, this is considered a leak, ie a sealing defect of the item 11 to be tested. Helium or hydrogen are often used as tracer gases because these gases pass through small leaks more easily than other gases due to the small size of their molecules and the high velocity of their displacement. The processing module 7 is further configured to display on the display element 9 preferentially belonging to the leak detection device 1 information 15 related to the leak detection result of the leak detection device 1 for the object 11 to be tested.

Leak searches are typically performed by moving the leak detection probe 3 or spray probe to discrete points of the item 11 to be tested, in particular points that may exhibit sealing weaknesses, such as seals, welds and couplings. Consequently, the operator 6 usually has to monitor both the probe 3 and the display element 9 of the leak detection device 1 at the same time, which is not easy to do depending on the size of the object 11 to be tested.

The purpose of the present invention is primarily to facilitate the localization and quantification of leaks of any type of item 11 to be tested, and in particular leaks of an item 11 to be tested of any size or geometry.

To this end, the invention relates to a method of checking the tightness of an object 11 to be tested by means of a tracer gas using the probe 3 of a leak detection device 1 . The method comprises steps aimed at scanning the outer surface of the object 11 with the probe 3 . Thus, contrary to the usual sealing measurement test at discrete points, the method according to the invention advantageously uses the scanning of the probe 3, ie the displacement of the probe 3 around the object, without necessarily having a predefined path.

Thus, the scanning step makes it possible to continuously record in the processing module 7 of the leak detection device 1 several values representative of the tracer gas leakage rate measured by the detection module 5 of the detection device 1 . Advantageously, according to the invention, each measured value representing the tracer gas leakage rate is associated with a value representing the position of the probe 3 .

Thus, the probe 3 comprises a positioning system 13 allowing its position to be transmitted in real time to the processing module 7 by wires (coupled to the flexible tube 2 ) or not by wires (wireless transmission). In order to determine a value representative of the position of the probe 3, the positioning system 13 may therefore comprise geolocation means and/or inertial measurement means and/or motion detection means.

The geolocation means may be of the terrestrial type, for example using GPS or a Galileo network 14, or of a local type, such as a dedicated network 14 temporarily installed by the user 6 or a network 14 existing around the object 11 used for testing, For example, a wireless local area network (such as a WIFI network or a GSM network) is used to track changes in the position of the probe 3 in the network 14 .

The inertial measurement device may comprise at least one accelerometer and/or an inertial unit and/or a gyroscope, making it possible to determine the movement of the probe 3 relative to the reference point at which the scanning step starts. Finally, the motion detection means may comprise detectors such as of the video type or of the ultrasonic type, making it possible to determine the movement of the probe 3 relative to the reference point at which the scanning step begins. Obviously, the positioning system 13 can change the positioning of the probe 3 by other means without departing from the scope of the present invention. For example, a mobile phone terminal combines several of the above-mentioned devices.

Thus, according to the invention, the scans are advantageously automatically positioned by the localization system 13 and continuously correlated by the processing module 7 with the measurements obtained by the detection module 5, thus allowing the ) Graphical display of the value association of the two types of records.

The scanning step can be activated and/or deactivated by an actuation element 8 mounted on the probe 3 . As non-limiting examples, the actuating element 8 may be a switch, a switch or a button of the mechanical or capacitive type. This notably allows the user 6 to start each test when the tip of the probe 3 is in the desired position for starting the scanning step.

During the scanning step, each time the probe 3 is stationary for a predetermined time suitable for taking a measurement of a value representing the tracer gas leakage rate of the detection device 1, a measurement trace associated with a value representing the position of the probe is preferentially recorded The value of the gas leakage rate. Typically, the predetermined time is a function of the leak detection device 1 and may generally be between 1 second and 10 seconds, that is to say, for example, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds seconds, 8 seconds, 9 seconds or 10 seconds.

Obviously, alternatively or additionally, at least one value representing the measured tracer gas leakage rate associated with the value representing the position of the probe can also be recorded on demand by the manual control element 10 , for example present on the probe 3 and can be actuated by the user 6 to significantly selectively increase the frequency of recording correlation values during the scanning step in certain regions comprising for example more undulations requiring significantly more values representative of the probe 3 position. Furthermore, assuming that the detection device 1 is less reactive, that is to say has, for example, more than six seconds to perform the measurement, a dependency of the leak rate is also conceivable by taking into account the delays associated with the response of the detection device 1 and/or with the measurement time The correction of as a function of the position of probe 3.

Simultaneously with and/or after the scanning step, the method consists in aiming to graphically represent on the display element 9 of the leak detection device 1 and/or externally the correlation values recorded during the scanning of the outer surface of the object 11 to be tested. The steps on the display element 9 (not shown).

Advantageously, according to the invention, and in contrast to the usual tightness measurement tests at discrete points, the scanning of the probe 3 makes it possible to obtain measurements of the tracer gas leakage rate at the end of the test and/or as the test progresses in relation to the probe. A graphical representation of the associated spatial position of the needle 3 relative to the object 11 to be tested becomes available.

The user 6 thus has a complete overview. He or she can thus focus on the scanning of all or part of the outer surface of the object 11 to be tested, depending on its complexity, by precisely guiding the tip of the probe.

Notably, the user 6 can graphically determine the area to be inspected as a function of the scanning start area, or possibly in greater detail. Furthermore, the user 6 can immediately recognize whether a part of the scanning area has been forgotten. He or she can then add additional values closer to those already performed and/or complete areas that were forgotten during the previous scan.

According to the example shown in FIG. 3 , during the representation step, the outer surface of the object 11 can be displayed as information 15 in two dimensions as a function of the coordinates representing each value of the position of the probe 3 , that is to say, the object The outer surface of 11 appears to be substantially flat. This substantially flat surface is indicated by the identification of a value indicative of the tracer gas leakage rate measured by the detection module 5 of the detection device 1 . The display allows for a faithful and simple rendering of the outer surface, allowing for rapid diagnostic analysis.

According to another variant shown in the example of FIG. 4 , the outer surface of the object 11 can be displayed as information 15 in three dimensions, that is to say that the outer surface of the object 11 is essentially displayed as a volume. This three-dimensional surface is displayed with the identification of the values measured by the detection module 5 of the detection device 1 representing the leakage rate of the tracer gas. This display allows for a more faithful rendering of the geometry of the exterior surface, allowing for faster diagnostic analysis.

The identification of the value measured by the detection module 5 of the detection device 1 representing the tracer gas leakage rate may be inserted by a number (for example, the leakage rate, the concentration or the partial tracer gas pressure) irrespective of the change indication of the outer surface of the object 11. number), the local deformation of the displayed outer surface of the object 11 (such as in the form of a cone or pyramid) or local coloring (such as a region colored by a single color according to a change in brightness or a region colored according to different colors) as a result of the detection device 1 The function of the magnitude of the value representing the tracer gas leakage rate measured by the detection module 5 is realized. This identification thus makes it possible immediately to locate and quantify defects on the outer surface of the object 11 to be tested. In the example of FIGS. 3 and 4 , this identification is provided by a local coloring of the outer surface displayed on the display element 9 .

Finally, the method according to the invention can also provide a step in which the graphical representation can advantageously be compared with a previously obtained graphical representation of the same item or item of the same type by the processing module 7 in order to identify any sealing deviations.

Thus, the obtained information 15 can be compared with previously obtained information of the same object. Spots that are deteriorating faster than others can then be quickly diagnosed simply and quickly to take corrective action.

According to another application, the obtained information 15 can be compared with previously obtained information on items of the same type, typically on a production line. Production deviations of objects 11 of the same type can then be quickly diagnosed simply and quickly in order to take corrective measures on the production line.

According to yet another application, the obtained information 15 can be compared with information of objects of the same type certified to meet a certain standard in order to track the maintenance of the production quality of the production line and the item 11 to be tested can also be certified to meet a certain standard.

The present invention is not limited to the presented embodiments and modifications, and other embodiments and modifications will be apparent to those skilled in the art to which the invention pertains. Therefore, the embodiments and modifications can be combined with each other without departing from the scope of the present invention. Furthermore, other types of applications than those presented in this description may be envisaged without departing from the scope of the present invention. As a non-limiting example, the display element 9 may not belong to the leak detection device 1 without departing from the scope of the present invention. The display element 9 may allow an externalized representation, for example by connecting the detection device 1 to another device, such as a computer or a smartphone.

Furthermore, it is conceivable that the information 15 is in a pre-recorded form supplemented with relevant values obtained during the steps of the method described above. More specifically, if the object 11 or the type of object 11 to be tested was previously identified, the outer envelope can be filled by the processing module 7, and then, using the scanning step, the outer envelope is displayed during the graphical representation step The outer surface information 15 is populated to allow an immediate graphical display of the seal of the object 11 to be tested. An example of such a representation of information 15 is shown in FIG. 6 . The item 11 visible in FIG. 5 is a vacuum tank. From the identification of the object 11 , the outer envelope is filled by the processing module 7 . The user 6 then performs the scanning step of the method according to the invention, so that the outer envelope is filled during the scanning step and/or at the end of the scanning step with the outer surface information 15 displayed during the graphical representation step. As shown in FIG. 6 , according to the invention, the graphical display advantageously allows a simple and quick determination of the tightness of the test object 11 .

According to yet another possibility, if the object 11 to be tested or the type of object 11 is identified in advance, the outer envelope with previously obtained correlation values or with correlation values that should be obtained can be filled by the processing module 7 and then, using the scanning step, the outer envelope is filled by the difference between the outer surface information 15 displayed during the graphical representation step and the information 15 with the previously obtained correlation value or the correlation value that should be obtained to allow for deviations between the two implementations of the method Graphical display immediately.

Finally, it is conceivable that the positioning system 13 is installed not in the probe 3 but outside the probe 3 . The positioning system 13 may then comprise at least one detector installed in the vicinity of the object 11 to be tested, for example of a video or ultrasonic type which can determine the movement of the probe 3 relative to the reference point at which the scanning step begins.

1: Leak detection device 2: flexible tube 2a: pipeline 2b: pipeline 3: Probe 4: Detection unit 5: Tracer gas detection module 6: User 7: Processing module 8: Actuation element 9: Display components 10: Manual control components 11: The object to be tested 13: Positioning system 14: Network 15: Information 16: Control

Other specific features and advantages of the invention will emerge clearly from the description given below, with reference to the accompanying drawings, in an indicative and non-limiting manner, in which:

[Fig. 1] is a schematic diagram of a leak detection device for leak detection;

[Fig. 2] is a partially enlarged view of Fig. 1, focusing on the probe of the leak detection device;

[Fig. 3] is an example of two-dimensional display information obtained according to the method of the present invention;

[ FIG. 4 ] is an example of information displayed in three dimensions obtained according to the method of the present invention;

[Fig. 5] is a schematic diagram of an object tested using the method of the present invention;

[ FIG. 6 ] is an example of information displayed in three dimensions of the object in FIG. 5 obtained according to the method of the present invention;

[ Fig. 7 ] is a schematic diagram of an injection leakage detection device.

1: Leak detection device

2: flexible tube

3: Probe

4: Detection unit

5: Tracer gas detection module

6: User

7: Processing module

9: Display components

11: The object to be tested

Claims (12)

A method for checking the tightness of an object (11) to be tested connected to a leak detection device (1) by means of a tracer gas, the method consisting of using a tracer gas injection blower formed intended for spraying the object (11) Probe (3), comprises the following steps: - scan the outer surface of the object (11) with the probe (3) to continuously record in the processing module (7) of the leak detection device (1) the indication measured by the leak detection device (1) several values of the tracer gas leak rate, each value measured representing the tracer gas leak rate is associated with a value representing the position of the probe (3); - graphically representing on a display element (9) the associated value recorded during the scanning of the outer surface of the object (11). A method for checking the tightness of an object (11) to be tested filled with a tracer gas by means of a tracer gas, the method consisting of using a probe (3) forming a leak detection probe connected to a leak detection device (1), Contains the following steps: - scan the outer surface of the object (11) with the probe (3) to continuously record in the processing module (7) of the leak detection device (1) the indication measured by the leak detection device (1) several values of the tracer gas leak rate, each value measured representing the tracer gas leak rate is associated with a value representing the position of the probe (3); - Graphically representing on a display element (9) associated values recorded during the scanning of the outer surface of the object (11). The method according to claim 1 or 2, wherein, during the scanning step, each time the probe (3) is adapted to perform the measurement of the value representing the tracer gas leakage rate by the leak detection device (1) When stationary for a predetermined time, the measured value representing the tracer gas leakage rate associated with the value representing the position of the probe (3) is recorded. Method according to claim 1 or 2, wherein, during the scanning step, the value representative of the position of the probe (3) is obtained by a positioning system (13) installed in the probe (3). The method according to claim 1 or 2, wherein, during the representing step, the outer surface of the object (11) is represented in a two-dimensional manner according to the coordinates representing each value of the position of the probe (3) Shown, the displayed outer surface of the object (11) contains identification of the value measured by the leak detection device (1) representing the tracer gas leak rate. The method according to claim 5, wherein, during the representing step, the identification of the value representing the tracer gas leakage rate measured by the leak detection device (1) is obtained by the displayed object (11) The local deformation of the outer surface is performed as a function of the magnitude of the value measured by the leak detection device (1) representing the leak rate of the tracer gas. The method according to claim 5, wherein, during the representing step, the identification of the value representing the tracer gas leakage rate measured by the leak detection device (1) is obtained by the displayed object (11) The local coloring of the outer surface is performed as a function of the magnitude of the value measured by the leak detection device (1) representing the tracer gas leakage rate. The method according to claim 1 or 2, wherein, during the representation step, the outer surface of the object (11) is displayed in three positions according to the coordinates representing each value of the position of the probe (3) Dimensionally, the outer surface of the object (11) shown includes identification of the value measured by the leak detection device (11) representing the tracer gas leak rate. The method according to claim 8, wherein, during the step of representing, the identification of the value representing the tracer gas leakage rate measured by the leak detection device (1) is performed by the object (11) displayed The local deformation of the outer surface is performed as a function of the magnitude of the value measured by the leak detection device (1) representing the leak rate of the tracer gas. The method according to claim 8, wherein, during the step of representing, the identification of the value representing the tracer gas leakage rate measured by the leak detection device (1) is performed by the object (11) displayed The local coloring of the outer surface is performed as a function of the magnitude of the value measured by the leak detection device (1) representing the tracer gas leakage rate. A method according to claim 1 or 2, wherein the graphical representation is compared with a previously obtained graphical representation of the same item (11) or of the same type of item (11) to identify any sealing deviations. A leak detection device (1) includes a probe (3), a detection module (5), a processing module (7) and a display element (9), characterized in that the leak detection device (1) includes a probe that allows the probe The position of the needle (3) is transmitted in real time to the positioning system (13) of the processing module (7), and in that the processing module (7) is configured to implement the method according to any one of claims 1-11.

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