device for monitoring liquid, in particular fermentable liquid, such as must, in particular during fermentation of said liquid

Abstract

Device (1) for monitoring liquid comprising an apparatus (2) for measuring a parameter representative of the density of the liquid (30) to be monitored, this measuring apparatus (2) comprising at least one floating structure (3), at least one member (4) for determining the position of at least one part of the floating structure (3), and at least one transmitter (5) for transmitting data. The device (1) comprises an enclosure (6) housing the floating structure (3) and a system (7) for attaching the enclosure (6).Said enclosure (6) has a first end (8) and develops from the first end towards the second opposite end, forming a chamber (10) delimited by a solid wall (11) and a porous wall (12) to provide inside the chamber (10), in the manner of a diving bell, a first space (14) in which air is capable of being trapped in the submerged state of the enclosure (6) and a second space (15) inside which the liquid to be monitored can circulate and the attachment system (7) comprises a suspension rod (16) connected at one end (17) to the enclosure (6) and equipped at its opposite end (18) with an attachment member (19) for maintaining the enclosure (6) in the suspended state. Figure for the abstract: Fig. 1.

Description

Title of the invention: Device for monitoring liquid, in particular fermentable liquid, such as must, in particular during the fermentation of said liquid

[0001] The present invention relates to a device for monitoring liquid, in particular fermentable liquid, such as must, in particular during the fermentation of said liquid.

[0002] It relates in particular to a device for monitoring liquid, in particular fermentable liquid, said device comprising at least one apparatus for measuring a parameter representative of the density and / or the volumetric mass of the liquid to be monitored, this measuring apparatus comprising at least one floating structure, at least one member for determining the position of at least one part of the floating structure to enable position data to be provided as a function, in the at least partially immersed state of said floating structure in the liquid to be monitored, at least of the density and / or the volumetric mass of the liquid in which the floating structure is at least partially immersed, and at least one transmitter capable of transmitting data as a function of the position data provided by the at least one member for determining the position of at least one part of the floating structure.

[0003] Many fruit or vegetable juices are subjected to fermentation, particularly for the production of beverages. This is the case for grape juice, also known as must, whose fermentation allows the production of wine. During this alcoholic fermentation, the sugars in the juice are transformed into alcohol. One of the ways to monitor this fermentation, which takes place in vats, is to regularly take samples on which measurements, particularly of the density and / or specific gravity, are taken. It is thus possible to monitor the evolution of the density and / or specific gravity of the must tested. This density or specific gravity evolves over time in the direction of a reduction, reflecting an increase in the alcohol content of the liquid. When the density or specific gravity has reached a predetermined value or is no longer evolving, fermentation is considered complete. However, such a procedure is tedious and unreliable.There are also devices also called hydrometers that can measure the density and / or volumetric mass of a liquid in real time and continuously. This is the case, for example, of the hydrometer described in patent US2014 / 0260607. The principle of such a hydrometer is to tilt according to the density of the liquid in which it floats and to measure said tilt to deduce the density or volumetric mass of the liquid. However, such a hydrometer requires an undisturbed environment for the . carrying out measurements. Such systems have never been used for monitoring the fermentation of grape juice for the production of red or white wine. Indeed, the presence of a cap of marc during the fermentation of juice for the production of red wine prevents free flotation of the hydrometer. The presence of significant movements of the liquid resulting, during the fermentation of juice for the production of white wine, from gas releases, distorts the inclination of the hydrometer and consequently the measurements provided by said hydrometer.

[0004] An aim of the invention is to propose a device for monitoring liquid, in particular fermentable liquid, the design of which allows real-time and continuous monitoring of fermentation, including for liquids used in the production of alcoholic beverages.

[0005] For this purpose, the invention relates to a device for monitoring liquid, in particular fermentable liquid, said device comprising at least one apparatus for measuring a parameter representative of the density and / or the volumetric mass of the liquid to be monitored, this measuring apparatus comprising at least one floating structure, at least one member for determining the position of at least one part of the floating structure to enable position data to be provided as a function, in the at least partially immersed state of said floating structure in the liquid to be monitored, at least of the density and / or the volumetric mass of the liquid in which the floating structure is at least partially immersed, and at least one transmitter capable of transmitting data as a function of the position data provided by the at least one member for determining the position of at least one part of the floating structure,characterized in that the device comprises an enclosure for housing the floating structure and a system for attaching the enclosure, in that said enclosure, intended to be immersed in the liquid to be monitored, has a first so-called closed end and a second end and develops from the first end towards the second end, forming a chamber delimited by a solid wall and a so-called porous wall provided with through openings to provide inside the chamber, in the manner of a diving bell, at least a first so-called upper space delimited at least by the solid wall in which air is capable of being trapped in the submerged state of the enclosure and a second so-called lower space delimited by the porous wall inside which the liquid to be monitored is capable of circulating,and in that the attachment system comprises at least one so-called suspension rod connected at one end to the enclosure and equipped at its opposite end with at least one attachment member to allow the enclosure to be maintained in the suspended state in a position in which the first end of the enclosure extends above the second end of the enclosure. The presence of an enclosure for housing the floating structure inside which the structure, surrounded by said enclosure, is capable of occupying several positions makes it possible to protect the floating structure from the environment. The production of the enclosure in the form of a chamber in the manner of a diving bell makes it possible, in the at least partially submerged state of the enclosure, to form, inside the enclosure, at the interface of the volume of trapped air and the mass of circulating liquid, a so-called free flotation surface of the floating structure. The floating structure can thus float freely inside the enclosure without being disturbed by the environment and take a position depending on the density of the liquid in which it floats. The enclosure thus makes it possible to provide a volume sized in such a way that, inside said volume, the floating structure can float and take a flotation position depending on the density of the liquid in which it floats, in the at least partially submerged state of the enclosure in said liquid.The airtight and watertight closed end of the enclosure, in cooperation with the solid wall, allows for a secure provision of a sealed volume capable of trapping air. The presence of the enclosure attachment system and its design make it possible to ensure, in the at least partially submerged state of the enclosure in the liquid to be monitored, a positioning of the enclosure in which the first space extends above the second space so that the formation of a flotation surface at the interface of the trapped air volume and the circulating liquid mass is guaranteed.

[0006] According to one embodiment of the invention, the device comprises at least one filter element positionable around the porous wall of the enclosure. The presence of a strainer-type filter element around the porous wall of the enclosure makes it possible to filter the largest particles contained in the liquid to be monitored and thus prevent an accumulation of these particles in the enclosure. Such an accumulation could obstruct the openings of the porous wall and prevent circulation of the fluid through the enclosure.

[0007] According to one embodiment of the invention, the filter element is a flexible perforated plate whose openings preferably have a diameter of between 2 and 5 mm, more preferably close to 3.15 mm. This flexible perforated plate may be in the form of a mesh plate.

[0008] According to one embodiment of the invention, the through openings of the porous wall of the enclosure are circular openings. The presence of circular openings allows better circulation of the liquid inside the enclosure.

[0009] According to one embodiment of the invention, the through openings of the porous wall of the enclosure have a diameter of between 0.5 mm and 15 mm, preferably close to 10 mm.

[0010] According to one embodiment of the invention, at least a portion of the through openings of the porous wall of the enclosure are arranged at a connection zone of the porous wall to the second end of the enclosure. Again, this This arrangement facilitates the flow of liquid and prevents the accumulation of particles within the enclosure.

[0011] According to one embodiment of the invention, the second end of the enclosure is delimited by at least one part, mounted to move relative to the porous wall of the enclosure for the passage of said second end from a closed position to an open position or vice versa. The second end of the enclosure is preferably also a closed end. The production of the second end of the enclosure in the form of a movable end makes it possible to open the enclosure via said second end. This results in the possibility of easily placing at least the floating structure of the measuring device inside the enclosure.

[0012] According to one embodiment of the invention, the second end of the enclosure is a conical end, said second end being delimited by a cone connected by its base forming a solid surface, preferably flat, to the porous wall of the enclosure. The conical shape makes it easier for the enclosure to penetrate into the liquid to be monitored.

[0013] According to one embodiment of the invention, the cone is removably attached to the porous wall of the enclosure. This design makes it possible to easily place at least the floating structure of the measuring device inside the enclosure.

[0014] According to one embodiment of the invention, the or at least one of the attachment members has the shape of a crook. This crook facilitates the attachment of the device to the upper edge of a fermentation tank.

[0015] According to one embodiment of the invention, the or at least one of the attachment members has the form of a bar extending transversely to the rod. This design makes it possible to position the bar horizontally on the opening of a tank for simple maintenance in the suspended state of the device.

[0016] According to one embodiment of the invention, the device comprises a data receiver and a transmission relay, such as an antenna, arranged between the transmitter and the receiver, at least part of the relay being positioned inside the rod which is a hollow rod. The presence of a transmission relay makes it possible to guarantee good transmission of the measured data in all circumstances and whatever the nature of the liquid medium in which the device is placed.

[0017] According to one embodiment of the invention, the floating structure of the measuring device is a structure in the form of a watertight hollow body, this floating structure having a center of gravity and a center of buoyancy which do not coincide to occupy a position depending on the density of the liquid in which the structure floats, in that the or at least one of the members for determining the position of at least one part of the floating structure capable of providing position data is a member for determining the inclination of at least one part of the structure floating relative to the vertical, such as an accelerometer, and in that said measuring device comprises a power supply source, such as an accumulator. The advantage of such a design lies in the ease of replacing the measuring device in the event of failure. It is sufficient to open the enclosure and remove the floating structure and replace it. The floating structure is in fact freely arranged inside the enclosure without anchoring to the enclosure.

[0018] According to one embodiment of the invention, the measuring device comprises a temperature sensor capable of providing temperature data.

[0019] According to one embodiment of the invention, the device comprises at least one electronic and / or computer module for processing position measurement data to determine the density and / or the volumetric mass of the liquid from said data.

[0020] The invention also relates to a method for monitoring liquid using a device for monitoring liquid, characterized in that the device for monitoring liquid being of the aforementioned type, the method comprises, in the positioned state of the floating structure in the enclosure, a step of positioning the enclosure in the liquid to be monitored to a position in which the first end of the enclosure extends above the second end of the enclosure and at least the porous wall of the enclosure is immersed in the liquid and a step of attaching the device in said position. Brief description of the drawings

[0021] The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

[0022] [Fig-1] represents a schematic view of the principle of a device in accordance with the invention in configuration for use in a liquid fermentation tank for the production of red wine;

[0023] [Fig.2] represents a schematic view of a device according to the invention with a hook-type attachment member;

[0024] [Fig.3] represents a schematic view of a device according to the invention with a bar-type attachment member;

[0025] [Fig.4] represents a partial view of a device according to the invention;

[0026] [Fig.5] represents a front view of the second conical end of the enclosure;

[0027] [Fig.6] represents a schematic view of a measuring device;

[0028] [Fig.7] represents a partial view, partially transparent, of a device in accordance with the invention.

[0029] As mentioned above, the invention relates to a device 1 for monitoring liquid, in particular fermentable liquid, as in the example shown in [Fig.l], where the liquid to be monitored is grape must for the production of red wine.

[0030] The liquid 30 is therefore contained in a fermentation tank 31.

[0031] The device 1 which is the subject of the invention is intended to be at least partially immersed in the liquid present under this cap of grounds.

[0032] This device 1 is intended to monitor the fermentation of the liquid by measuring a parameter representative of the density and / or the volumetric mass of this liquid. This density and / or this volumetric mass decreases over time, following the transformation of the sugars into alcohol. The end of the alcoholic fermentation corresponds either to a stabilization of the density and / or the volumetric mass of the liquid, or to a predetermined value of this density and / or this volumetric mass.

[0033] The device 1 which is the subject of the invention allows the real-time and continuous measurement of a parameter representative of this density and / or this volumetric mass.

[0034] The device 1 therefore comprises a measuring apparatus comprising at least one floating structure 3, at least one member 4 for determining the position of at least one part of the floating structure 3 to enable position data to be provided as a function, in the at least partially immersed state of said floating structure 3 in the liquid 30 to be monitored, of at least the density and / or the volumetric mass of the liquid 30 in which the floating structure 3 is at least partially immersed and at least one transmitter 5 capable of transmitting data as a function of the position data provided by at least the member 4 for determining the position of at least one part of the floating structure 3.

[0035] The floating structure 3 or at least a part of the floating structure 3 is sensitive to the density and / or to the volumetric mass of the liquid 30 in which the floating structure 3 is capable of floating in order, in the state at least partially immersed in a liquid, to occupy a position depending on the density of the liquid in which the floating structure 3 floats.

[0036] The floating structure 3 or at least a part of the floating structure 3 has the function of a densimeter and is therefore configured to, in the state at least partially immersed in a liquid, occupy a position depending on the density of the liquid in which the floating structure 3 floats.

[0037] The details of such a measuring device are provided in [Fig.6]. In this example, the floating structure 3 of the measuring device is a structure in the form of a hollow, watertight body. This floating structure 3 has a center of gravity (CG) and a center of buoyancy also called the center of buoyancy (CF) which do not coincide, to occupy a position depending on the density of the liquid in which the floating structure 3 floats.

[0038] In the example shown, the hollow body of the floating structure 3 is cylindrical in shape. The floating structure 3 tends to tilt depending on the thrust forces to which it is subjected when it floats. These thrust forces vary depending on the density and / or the density of the liquid, based on Archimedes' principle.

[0039] In this embodiment, the member 4 for determining the position of the floating structure 3 or of at least a part of the floating structure 3 is a member for determining the inclination of at least a part of the structure relative to the vertical, in this case of the entire structure relative to the vertical.

[0040] This determination member 4 is here produced in the form of an accelerometer.

[0041] This member 4 for determining the position of the floating structure 3 is housed in inside the floating structure 3, but could have been fixed on the floating structure 3, without departing from the scope of the invention.

[0042] The measuring device 2 also comprises a power supply source 26, such as an accumulator. In the example shown, this accumulator is a battery placed in the watertight floating structure 3.

[0043] In the example shown, the measuring device also comprises a temperature sensor 27, capable of providing temperature data of the liquid surrounding the measuring device.

[0044] Again, this temperature sensor is arranged on or in the floating structure 3.

[0045] The details of the measuring device 2 will not be provided below, because it is well known to those skilled in this art, as illustrated for example by US patent 9,234,828. Obviously, any other measuring device with a densimeter function incorporating a floating structure 3 can be used, without departing from the scope of the invention.

[0046] The measuring device 2 also comprises a transmitter 5 capable of transmitting data, depending on the position data provided by the member 4 for determining the position of at least a part of the floating structure 3. This transmitter 5 can be integrated into the floating structure or carried by the floating structure 3. The transmitted data can be raw or processed data.

[0047] In the examples shown, the device comprises a data receiver 24 and a transmission relay 25, such as an antenna, arranged between the transmitter 5 and the receiver 24.

[0048] Data transmission is carried out partly by radio link, for example by UHF radio link of the Bluetooth type.

[0049] Thus, the data from the member 4 for determining the position of at least one part of the floating structure 3 are transmitted by the transmitter 5 to a remote receiver 24 which is generally arranged outside the liquid 30 to be monitored.

[0050] The device 1 also comprises at least one electronic and / or computer module 28 for processing the position data, to determine the density and / or the volumetric mass of the liquid from said data.

[0051] This electronic module 28 is a computer and / or electronic system which comprises at least one processor, a data storage memory and a program executable by the processor.

[0052] This electronic module 28 can integrate a display device. This electronic module 28 can also be put into communication with a remote terminal such as a computer, a mobile phone or other, on which the processed data can be displayed.

[0053] The device 1 comprises an enclosure 6 for housing the floating structure 3 inside which the floating structure 3 surrounded by said enclosure 6 is free to move, and a system 7 for attaching the enclosure 6.

[0054] In the examples shown, the electronic module 28 described above is carried by the attachment system 7 as is the receiver 24, which can be integrated into the electronic and / or computer module 28.

[0055] The enclosure 6 intended to be immersed in the liquid 30 to be monitored has a first end 8 closed in a watertight and airtight manner, a second end 9 which is preferably also closed in a watertight manner.

[0056] The enclosure 6 is here an enclosure of generally cylindrical shape with two ends of conical shape to give the enclosure 6 a cylindro-conical shape.

[0057] The enclosure 6 therefore develops between these two ends from the first end 8 towards the second end 9, forming a chamber 10 delimited by a solid wall 11 and a so-called porous wall 12 provided with through openings 13 to provide, inside the chamber 10, in the manner of a diving bell, at least a first space 14 called upper, delimited at least by the solid wall 11 in which air is able to be trapped in the submerged state of the enclosure 6 and a second space 15 called lower, delimited by the porous wall 12, inside which the liquid to be monitored is able to circulate.

[0058] Thus, a so-called free surface at which the floating structure 3 can freely float is provided in the enclosure 6, at the interface of the zone in which air is trapped and the zone in which the liquid circulates through the enclosure. This interface is shown in [Fig.l].

[0059] Thus, at this interface zone, the member 4 for determining the position of at least a part of the floating structure 3 determines the position, in particular the inclination of the floating structure 3 and addresses this position data via the transmitter 5 and here the transmission relay 25 to the receiver 24.

[0060] To allow immersion at the required level of the enclosure 6, that is to say at a level sufficient to trap a mass of air in the enclosure 6 and maintain it in position, a system 7 for attaching the enclosure 6 is required. This attachment system 7 comprises a so-called suspension rod 16 connected at one end 17 to the enclosure 6 and equipped at its opposite end 18 with at least one attachment member 19 to allow the enclosure 6 to be maintained in the suspended state in a position in which the first end 8 of the enclosure 6 extends above the second end 9 of the enclosure 6. This rod 16 extends mainly outside the enclosure 6.

[0061] In the examples shown, the rod 16 is a hollow rod and at least part of the transmission relay 25, in this case the antenna, is positioned inside the rod 16. The antenna therefore extends from the enclosure inside the rod until it projects from the outside of the end of the rod provided with the attachment member 19.

[0062] The rod is connected to the enclosure at the first end 8 of the enclosure 6. Thus, in the example shown in Figures 2 and 3, the first end of the enclosure is frustoconical in shape and is connected by its large base to the solid wall of the enclosure.

[0063] The rod is arranged in the center of the small base of the truncated cone and extends parallel to the longitudinal axis of the enclosure, which here corresponds to the median longitudinal axis of the cylinder. This rod is equipped with a hooking member 19.

[0064] In the example shown in [Fig. 2], the hooking member 19 has the shape of a crook. This crook forms a curved U-shaped portion at the end of the rod, this U being open in the direction of the enclosure. One branch of the U and the rod are coaxial. The other branch of the U is provided with clamping screws which form, with the rod 16, the clamping jaws of a vice between which a wall of the fermentation tank whose liquid is to be monitored is able to be inserted.

[0065] Thus, the rod runs vertically inside the tank, while the hooking member 19 extends partially outside the tank, being arranged astride an edge of the tank.

[0066] The enclosure 6 is thus perfectly maintained in the position in which the first end 8 of the enclosure extends above the second end 9 of the enclosure 6.

[0067] The rod 16 may be of adjustable length. The same may be true of the attachment member 19 to vary the immersion level of the enclosure 6.

[0068] [Fig. 3] illustrates a hooking system 7, with a hooking member 19 which has the form of a bar extending transversely to the rod 16. Thus, the bar can be positioned horizontally on the surface of a tank open from above. This arrangement again allows the enclosure 6 to be securely held in the desired position.

[0069] To perfect the device 1, the latter generally comprises at least one filtering element 20 positionable around the porous wall 12 of the enclosure 6. This filtering element 20 is, in the examples shown, a flexible perforated plate, in particular a mesh plate, the openings 21 or meshes of which have a diameter of between 2 and 5 mm, preferably close to 3.15 mm.

[0070] In the example shown, the filter element 20 is provided, at the two opposite edges of the plate, with a clamping rod. This clamping rod is itself fixed to the enclosure 6.

[0071] This filtering element 20 is blocked in axial displacement along an axis parallel to the longitudinal axis of the enclosure 6 by two collars arranged, one called upper, in the transition zone between the solid and porous walls of the enclosure 6, the other called lower at the level of the connection zone of the porous wall of the enclosure to the second end 9 of the enclosure 6.

[0072] It is noted that the through openings 13 of the porous wall 12 of the enclosure 6 are circular openings 13. These through openings 13 of the porous wall 12 of the enclosure 6 have a diameter of between 0.5 and 15 mm, preferably close to 10 mm. At least a portion of the through openings 13 of the porous wall 12 of the enclosure 6 are arranged at a zone 22 connecting the porous wall 12 to the second end 9 of the enclosure 6, to prevent any accumulation of particles at this level.

[0073] The second end 9 of the enclosure 6 is delimited by at least one part, mounted to move relative to the porous wall 12 of the enclosure 6 for the passage of said second end 9 from a closed position to an open position or vice versa.

[0074] In the examples shown, the second end 9 of the enclosure 6 is a conical end. This second end 9 is delimited by a cone 91 connected by its base 23 forming a flat surface to the porous wall 12 of the enclosure 6. Such a flat bottom of the enclosure makes it possible to avoid an accumulation of particles in the enclosure 6. The cone 91 is removably fixed to the porous wall 12 of the enclosure 6.

[0075] In the open position of the second end 9 of the enclosure 6, it is possible to introduce the floating structure 3 into the enclosure 6. The conical shape of this second end 9 helps the enclosure 6 to penetrate into the liquid. Similarly, the conical shape of the first end 8 of the enclosure 6 helps the device 1 to exit the liquid 30.

[0076] In the examples shown, the enclosure is made of metal. The cylindrical part of the enclosure has a height of 200 mm and a diameter of 153 mm.

[0077] In practice, the operation of such a device 1 is as follows: it is assumed that the first end 8 of the enclosure 6 from which the antenna constituting the transmission relay 25 and the rod 16 of the attachment system 7 leave is closed in an airtight and watertight manner. It is also assumed that the floating structure 3 has been inserted into the enclosure 6 via the second end 9 of the enclosure 6.

[0078] A first possibility consists of positioning this enclosure 6 in the tank at the desired level, fixing the enclosure 6 to the tank using the attachment system 7 and in particular using the attachment member 19, then filling the tank with liquid 30 to be monitored.

[0079] The position data supplied by the position determining member 4 are addressed by means of the transmitter 5 via the transmission relay 25 to the receiver 24 and to the electronic and / or computer module 28 for processing the data fixed on the attachment member 19 of the attachment system 7. The data can, after processing, and in particular conversion of the position data into data corresponding to the density and / or the density of the liquid, using for example appropriate concordance tables possibly also taking into account the temperature, be displayed at the level of the electronic and / or computer module or on a remote terminal.

[0080] The second implementation possibility consists of introducing the enclosure 6 of the device 1 into a tank 31 already filled with liquid 30. Once the enclosure is placed in position in the tank and fixed by its attachment system 7 to the tank, the measurement is carried out in an identical manner to that described above.

[0081] In all cases, the final position of the enclosure 6 inside the tank must be such that air is trapped inside the enclosure 6.

Claims

1. Claims Device (1) for monitoring liquid, in particular fermentable liquid (30), said device (1) comprising at least one apparatus (2) for measuring a parameter representative of the density and / or the volumetric mass of the liquid (30) to be monitored, this measuring apparatus (2) comprising at least one floating structure (3), at least one member (4) for determining the position of at least one part of the floating structure (3) to enable position data to be provided as a function, in the at least partially submerged state of said floating structure (3) in the liquid (30) to be monitored, of at least the density and / or the volumetric mass of the liquid in which the floating structure (3) is at least partially submerged, and at least one transmitter (5) capable of transmitting data as a function of the position data provided by the at least one member (4) for determining the position of at least one part of the floating structure (3),the device (1) comprising an enclosure (6) for housing the floating structure (3) and a system (7) for attaching the enclosure (6), characterized in that said enclosure (6), intended to be immersed in the liquid (30) to be monitored, has a first end (8) called closed and a second end (9) and develops from the first end towards the second end, forming a chamber (10) delimited by a solid wall (11) and a so-called porous wall (12) provided with through openings (13) to provide inside the chamber (10), in the manner of a diving bell, at least a first space (14) called upper delimited at least by the solid wall (11) in which air is capable of being trapped in the submerged state of the enclosure (6) and a second space (15) called lower delimited by the porous wall (12) inside which the liquid to be monitored is capable of circulating,in that the attachment system (7) comprises at least one so-called suspension rod (16) connected at one end (17) to the enclosure (6) and equipped at its opposite end (18) with at least one attachment member (19) to allow the enclosure (6) to be maintained in the suspended state in a position in which the first end (8) of the enclosure (6) extends above the second end (9) of the enclosure (6), in that the floating structure (3) is arranged freely inside the enclosure (6) without anchoring to the enclosure (6) and is configured to, float freely inside the enclosure (6) without being disturbed by the environment and take a position depending on the density of the liquid in which it floats, in that the floating structure (3) of the measuring device (2) is a structure in the form of a watertight hollow body, this floating structure (3) having a center of gravity (CG) and a center of buoyancy (CF) which do not coincide to occupy a position depending on the density of the liquid in which the structure floats, in that the or at least one of the members (4) for determining the position of at least one part of the floating structure (3) capable of providing position data is a member for determining the inclination of at least one part of the floating structure (3) relative to the vertical, such as an accelerometer, and in that said measuring device (2) comprises a power supply source (26),such as an accumulator and in that the openings (13) passing through the porous wall (12) of the enclosure (6) are circular openings (13) having a diameter of between 0.5 mm and 15 mm, preferably close to 10 mm.,

2. Device (1) for monitoring liquid (30) according to claim 1, characterized in that the device (1) comprises at least one filter element (20) positionable around the porous wall (12) of the enclosure (6).

3. Device (1) for monitoring liquid (30) according to claim 2, characterized in that the filter element (20) is a flexible perforated plate whose openings (21) preferably have a diameter of between 2 and 5 mm, more preferably close to 3.15 mm.

4. Device (1) for monitoring liquid (30) according to one of claims 1 to 3, characterized in that at least a part of the openings (13) passing through the porous wall (12) of the enclosure (6) are arranged at a zone (22) connecting the porous wall (12) to the second end (9) of the enclosure (6).

5. Device (1) for monitoring liquid (30) according to one of claims 1 to 4, characterized in that the second end (9) of the enclosure (6) is delimited by at least one mounted part, movable relative to the porous wall (12) of the enclosure (6) for the passage of said second end (9) from a closed position to an open position or vice versa.

6. Device (1) for monitoring liquid (30) according to one of claims 1 to 5, characterized in that the second end (9) of the enclosure (6) is a conical end, said second end (9) being delimited by a cone (91) connected by its base (23) forming a solid surface, preferably flat, to the porous wall (12) of the enclosure (6).

7. Device (1) for monitoring liquid (30) according to claim 6, characterized in that the cone (91) is removably attached to the porous wall (12) of the enclosure (6).

8. Device (1) for monitoring liquid (30) according to one of claims 1 to 7, characterized in that the or at least one of the hooking members (19) has the shape of a crook.

9. Device (1) for monitoring liquid (30) according to one of claims 1 to 8, characterized in that the or at least one of the hooking members (19) has the form of a bar extending transversely to the rod (16).

10. Device (1) for monitoring liquid (30) according to one of claims 1 to 9, characterized in that the device (1) comprises a data receiver (24) and a transmission relay (25), such as an antenna, arranged between the transmitter (5) and the receiver (24), at least a part of the relay (25) being positioned inside the rod (16) which is a hollow rod.

11. Device (1) for monitoring liquid according to one of claims 1 to 10, characterized in that the measuring apparatus (2) comprises a temperature sensor (27) capable of providing temperature data.

12. Device (1) for monitoring liquid according to one of claims 1 to 11, characterized in that the device (1) comprises at least one electronic and / or computer module (28) for processing position data to determine the density and / or the volumetric mass of the liquid from said data.

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