Liquid analysis device

Abstract

The invention relates to a liquid analysis device (1) having a longitudinal axis (5) and comprising: • - a tubular body (3) extending along the longitudinal axis (5) between a proximal end (3b) and a distal end (3a), and comprising a flexible distal portion (6) extending from the distal end (3a), wherein the flexible distal portion (6) has a stiffness of 0.4 kg to 4 kg according to ISO standard 10619-1: 2017, method A2: • - a submersible biological or chemical sensor (2) extending along the longitudinal axis (5) between a proximal end (2b) and a distal end (2a), wherein the sensor is (2) attached at its proximal end (2b) to the distal end (3a) of the body (3).

Description

[0001] LIQUID ANALYSIS DEVICE

[0002] Field of invention

[0003] The present invention relates to a liquid analysis device, in particular useful for the analysis of circulating water such as that of sanitation networks, comprising a chemical or biological sensor.

[0004] Technical background

[0005] Monitoring natural, urban, or industrial aquatic environments relies on the use of submerged analysis devices. These submerged analysis devices can be, for example, conductivity probes, pH probes, biosensor probes, or multiparameter probes.

[0006] Document US 11,352,272 describes an example of a probe comprising a biosensor.

[0007] US 2017 / 0219551 describes an elongated support for a submersible or semi-submersible sensor for water analysis. The elongated support is attached to a fixed structure.

[0008] Document US 6,993,988 describes attachment devices for fixing sensors together in a multi-sensor assembly intended to be inserted into a well, for example.

[0009] Document DE 20308461 U1 describes a floating device comprising a float with a sensor arranged on its lower face in contact with a liquid.

[0010] Document CN 205080125 U describes a floating support for a water quality analysis sensor in the context of wastewater treatment.

[0011] Submerged probes equipped with biosensors are commercially available, notably under the names NODE (Hydreka company, France), Sentry AD Biosensor (Island Water company, Canada), loT Biosensing (Nanoelectra company, Spain) and MiProbE (Burge Environmental company, USA).

[0012] There are also a large number of submersible probes commercially available that include a rigid sensor suspended from the end of a simple cable.

[0013] However, the present inventors have noted that a disadvantage presented by all existing probes, when they are subjected to a flow of water, is that they are prone to the catching of all kinds of materials or objects suspended in the water, such as soft waste (wipes, paper, tow, etc.), grease, sticky materials, hard objects (sand, gravel, wood, floating objects, etc.).

[0014] These materials and objects are likely to agglomerate on the probes, which can lead to fouling or even obstruction of the measuring cells, to a reduction in the fluid capacity of the pipes or channels in which the probes are integrated, and to an increase in the force exerted by the circulating water on the probe and its fixing elements, which can lead to mechanical breakage.

[0015] All of these problems lead to a reduction in the lifespan of the probes and an increased need for maintenance.

[0016] There is therefore a need to provide a device for analyzing liquid, and in particular for analyzing water, comprising a sensor intended to be immersed in the liquid, and making it possible to minimize the risks of damage and obstruction.

[0017] Summary of the invention

[0018] The invention relates in particular to the following objects.

[0019] Subject 1. Liquid analysis device having a longitudinal axis and comprising:

[0020] - a tubular body extending along the longitudinal axis between a proximal end and a distal end, and comprising a flexible distal portion extending from the distal end, the flexible distal portion having a stiffness of 0.4 to 4 kg according to ISO 10619-1:2017, method A2;

[0021] - an immersible biological or chemical sensor extending along the longitudinal axis between a proximal end and a distal end, the sensor being attached to the distal end of the body.

[0022] Object 2. Liquid analysis device having a longitudinal axis and comprising:

[0023] - a tubular body extending along the longitudinal axis between a proximal end and a distal end, and comprising a flexible distal portion extending from the distal end;

[0024] - a biological or chemical submersible sensor extending along the longitudinal axis between a proximal end and a distal end, the sensor being fixed to the distal end of the body; in which the assembly consisting of the sensor and the first 50 cm of the tubular body extending from its distal end has a density of 1 to 1.2 according to ISO 1183-1:2019.

[0025] Object 3. Liquid analysis device having a longitudinal axis and comprising:

[0026] - a tubular body extending along the longitudinal axis between a proximal end and a distal end, and comprising a flexible distal portion extending from the distal end;

[0027] - a biological or chemical submersible sensor extending along the longitudinal axis between a proximal end and a distal end, the sensor being attached to the distal end of the body; wherein the flexible distal portion of the body has a minimum radius of curvature less than or equal to 500 mm.

[0028] Object 4. Liquid analysis device having a longitudinal axis and comprising:

[0029] - a tubular body extending along the longitudinal axis between a proximal end and a distal end, and comprising a flexible distal portion extending from the distal end;

[0030] - a biological or chemical submersible sensor extending along the longitudinal axis between a proximal end and a distal end, the sensor being fixed to the distal end of the body; the device having a longitudinal external wall formed by a set of longitudinal generating lines, and in which the following condition is met by traveling each longitudinal generating line from a starting point P to the proximal end of the sensor: let D(l) be the distance between the longitudinal generating line and the longitudinal axis at any linear position I along the longitudinal generating line; let Dmax (I) be the maximum of D between point P and the linear position I; then, at any linear position I for which D(l) = Dmax(l), the longitudinal axis forms, with the tangent to the longitudinal generating line, an oriented angle less than or equal to 90°;point P being located proximally at a linear distance of 10 cm from the proximal end of the sensor.;

[0031] Object 5. Liquid analysis device having a longitudinal axis and comprising:

[0032] - a tubular body extending along the longitudinal axis between a proximal end and a distal end, and comprising a flexible distal portion extending from the distal end; - a biological or chemical submersible sensor extending along the longitudinal axis between a proximal end and a distal end, the sensor being attached to the distal end of the body; the device having a longitudinal outer wall which has a roughness Ra less than or equal to 60 pm, preferably less than or equal to 40 pm according to ISO 21920-1:2021, at any point from the proximal end of the body to the distal end of the device; and / or the sensor having a longitudinal outer wall having a roughness Ra less than or equal to 1.6 pm, preferably less than or equal to 0.8 pm according to ISO 21920-1:2021.

[0033] Object 6. Device according to one of objects 2 to 5, in which the flexible distal portion has a stiffness of 0.4 to 4 kg according to ISO 10619-1:2017, method A2.

[0034] Object 7. Device according to one of objects 1 or 3 to 5, in which the density of the assembly constituted by the sensor and the first 50 cm of the tubular body extending from its distal end has a density of 1 to 1.2 according to standard ISO 1183-1:2019.

[0035] Object 8. Device according to one of objects 1, 2, 4 or 5, in which the flexible distal portion of the body has a minimum radius of curvature less than or equal to 500 mm.

[0036] Object 9. Device according to one of objects 1, 2, 3 or 5, having a longitudinal external wall formed by a set of longitudinal generating lines, and in which the following condition is met by traveling each longitudinal generating line from a starting point P to the proximal end of the sensor: let D(l) be the distance between the longitudinal generating line and the longitudinal axis at any linear position I along the longitudinal generating line; let Dmax (I) be the maximum of D between point P and linear position I; then, at any linear position I for which D(l) = Dmax(l), the longitudinal axis forms, with the tangent to the longitudinal generating line, an oriented angle less than or equal to 90°; point P being located proximally at a linear distance of 10 cm from the proximal end of the sensor.

[0037] Object 10. Device according to one of objects 1 to 4, having a longitudinal external wall which has a roughness Ra less than or equal to 60 pm, preferably less than or equal to 40 pm according to standard ISO 21920-1:2021, at any point from the proximal end of the body to the distal end of the device.

[0038] Object 11. Device according to one of objects 1 to 4 or 10, in which the sensor has a longitudinal external wall having a roughness Ra less than or equal to 1.6 pm, preferably less than or equal to 0.8 pm according to standard ISO 21920-1:2021.

[0039] Object 12. Device according to one of objects 1 to 11, in which the sensor has a maximum diameter less than or equal to 200 mm.

[0040] Object 13. Device according to one of objects 1 to 12, in which the flexible distal portion of the body has a length of at least 50 cm, preferably at least 1 m, more preferably at least 1 m 50, along the longitudinal axis.

[0041] Object 14. Device according to one of objects 1 to 13, having a cross-section perpendicular to the longitudinal axis substantially constant from the proximal end of the body to the distal end of the device.

[0042] Object 15. Device according to one of objects 1 to 14, comprising a termination fixed to the proximal end of the body.

[0043] Object 16. Device according to one of objects 1 to 15, in which the sensor is a biosensor.

[0044] Object 17. Device according to one of objects 1 to 16, comprising a part for fixing to a frame and / or comprising a flexible guide for the tubular body.

[0045] Object 17. Installation for the analysis of a liquid, comprising a liquid analysis device according to one of objects 1 to 16, fixed to a frame, the liquid analysis device being immersed in a liquid.

[0046] Object 18. Installation according to object 17, in which the sensor and at least part of the flexible distal portion of the body are subjected to a flow of circulating liquid.

[0047] Object 19. Installation according to object 17 or 18, for the analysis of circulating water, and preferably for the analysis of water from a sanitation network.

[0048] The present invention makes it possible to meet the need expressed above. More particularly, it provides a device for analyzing liquid, and in particular for analyzing water, comprising a sensor intended to be immersed in the liquid, and making it possible to minimize the risks of damage and obstruction.

[0049] This is accomplished through one or more of the following characteristics:

[0050] - the choice of a tubular body holding the sensor in the water and having a flexible distal portion whose rigidity and / or minimum radius of curvature can be adjusted so as to offer sufficient resistance to the flow of liquid, while limiting interaction with suspended matter or objects; - by selecting a specific external profile for the part of the device intended to be immersed in a flow of liquid, this specific external profile being devoid of any relief likely to serve as an attachment point for a suspended matter or object;

[0051] - by adapting the density of the distal part of the device to optimize its buoyancy;

[0052] - by selecting a surface roughness for the submerged part of the device and in particular for the sensor itself, suitable for minimizing interaction with suspended materials or objects.

[0053] The analysis device described herein has reduced risks of damage by impact of solid objects (or by deformation by the flow of liquid) and of fouling (including by formation of a biofilm on its external surface). Its service life can thus be improved, and the frequency of necessary maintenance can be reduced.

[0054] Advantageously, the analysis device is configured, by the choice of the various parameters mentioned above, in such a way that the sensor has an intermediate position in the circulating liquid flow, that is to say that it is actually immersed and does not rise to the surface of the liquid, but that on the other hand it is carried along by the flow, thanks to the flexibility of the tubular body (the analysis device therefore not remaining oriented vertically).

[0055] Brief description of the figures

[0056] Figure 1 schematically represents an example of a liquid analysis device according to the present description.

[0057] Figure 2 schematically represents another example of a liquid analysis device according to the present description.

[0058] Figure 3 schematically represents a detail of three examples of liquid analysis devices according to the present description.

[0059] Figure 4 schematically represents another example of a liquid analysis device according to the present description.

[0060] Figure 5 schematically represents another example of a liquid analysis device according to the present description.

[0061] Figure 6 schematically represents another example of a liquid analysis device according to the present description.

[0062] Figure 7 schematically represents an example of an installation including a liquid analysis device according to the present description. Figure 8 schematically represents another example of an installation including a liquid analysis device according to the present description.

[0063] Figure 9 schematically represents another example of an installation including a liquid analysis device according to the present description.

[0064] Figure 10 schematically represents another example of an installation including a liquid analysis device according to the present description.

[0065] Figure 11 schematically represents an external profile of two liquid analysis devices.

[0066] Unless otherwise stated, like reference numbers in different figures have the same meaning.

[0067] Detailed description

[0068] The invention is now described in more detail and in a non-limiting manner in the following description.

[0069] Referring to Figure 1, a liquid analysis device 1 according to the present description comprises at least one submersible sensor 2 and a tubular body 3. By “submersible” sensor, it is meant that the sensor is adapted to operate while being at least partially immersed in the liquid to be analyzed.

[0070] Both the sensor 2 and the tubular body 3 extend along a longitudinal axis 5.

[0071] Although the device is shown with a straight longitudinal axis 5, it is possible that the device has one or more curved sections. In this case, the longitudinal axis itself may be at least partially curved. The longitudinal axis can be generally defined as the line extending from one end of the device to the other through the centroids of the sections (or cuts) of the device from one end to the other.

[0072] When the device has one or more portions in which the longitudinal axis is curved, this may be a permanent curvature (in the case of a rigid curved portion) or, preferably, a variable curvature depending on external conditions (in the case of a flexible portion). In this case, for simplicity, all the geometric characteristics of the present description may be taken with reference to the device oriented rectilinearly from one end to the other (the longitudinal axis then also being rectilinear).

[0073] A cross-section of the device is defined as a section in a plane intersected orthogonally by the longitudinal axis.

[0074] The terms "distal" and "proximal" refer to the two opposite directions along the longitudinal axis.

[0075] The sensor 2 is located in a distal part of the device 1.

[0076] The sensor 2 itself has a distal end 2a (which may also be the distal end of the device 1, as illustrated) and a proximal end 2b. The distal end of the device is generally a free end.

[0077] Preferably, the sensor 2 has a maximum diameter less than or equal to 200 mm. This maximum diameter may for example be from 10 mm to 200 mm, in particular from 20 mm to 100 mm, for example again from 30 mm to 80 mm. The maximum diameter of the sensor 2 is defined as the maximum (external) dimension of the sensor 2 over all the cross sections.

[0078] The body 3 is in the form of a pipe or tube, that is to say that it comprises an internal cavity delimited by an internal wall and extending along the longitudinal axis. This internal cavity contains a gas, preferably air. Preferably, in use, this internal cavity is sealed off from the surrounding liquid medium. Preferably, the internal cavity is sealed off from the atmosphere by a membrane, preferably a hydrophobic membrane, which allows gas exchange between the internal cavity and the atmosphere.

[0079] The internal cavity may have a circular section (perpendicular to the longitudinal axis). The internal cavity may have a maximum internal dimension, or internal diameter (perpendicular to the longitudinal axis) which may be at least 3 mm, preferably at least 5 mm, more preferably at least 8 mm, even more preferably at least 10 mm. For example, this internal diameter may be 3 to 30 mm, or 5 to 25 mm, or 8 to 20 mm, or 10 to 15 mm.

[0080] Body 3 has a distal end 3a and a proximal end 3b.

[0081] The body 3 comprises a flexible distal portion 6. It may consist solely of this flexible distal portion 6, as illustrated in FIG. 1, or it may also comprise other portions, as explained in more detail below.

[0082] A "flexible" portion means a portion that is capable of deforming in use (preferably elastically), when subjected to a flow of liquid. In contrast, an element is said to be "rigid" when it is essentially non-deformable in use, when subjected to a flow of liquid.

[0083] Preferably, sensor 2 is rigid.

[0084] Preferably, the flexible distal portion 6 of the body 3 is characterized by a rigidity of 0.4 to 4 kg, more preferably by a rigidity of 1 to 3 kg, more preferably by a rigidity of 2 to 3 kg, according to standard ISO 10619-1:2017, method A2.

[0085] This condition on rigidity relates to the body 3 as such. Indeed, at the junction between the body 3 and the sensor 2, or between the body 3 and another rigid part such as a termination 4 (as described in more detail below), the assembly formed by the body 3 and the sensor 2 or the other rigid part may be locally less flexible, or even rigid, for example when the sensor 2 or any other rigid part is inserted in whole or in part into the body 3. However, such stiffening at either end of the flexible distal portion 6, if applicable, does not significantly affect the general mechanical behavior of the flexible distal portion. Preferably, less than 20% of the length of the flexible distal portion 6, or less than 10%, or less than 5%, or less than 2%, is stiffened by the sensor 2 or by another rigid part.

[0086] The above stiffness ranges are advantageous, as excessive stiffness impairs shock absorption and promotes interaction with solid waste, while insufficient stiffness can lead to excessive deformation of the device, possibly leading to the sensor undesirably rising to the surface of the liquid.

[0087] The rigidity of the flexible distal portion 6 of the body 3 helps to minimize the risk of suspended matter catching and allows free orientation of the sensor in a liquid flow. This free orientation limits in particular the impact of hard objects in suspension on the device and therefore the risks of damage linked to an impact. It also limits the risks of plastic deformation or rupture linked to the force generated by the liquid flow.

[0088] Preferably, the flexible distal portion 6 of the body 3 is characterized by a minimum radius of curvature less than or equal to 500 mm, for example from 10 to 500 mm, in particular from 50 to 200 mm. The minimum radius of curvature corresponds to the minimum radius to which the body 3 can be curved or bent without being damaged, that is to say without undergoing plastic deformation. The above values ​​of the minimum radius of curvature allow the device to be adapted to installation in various configurations and in particular in a sanitation network.

[0089] The flexible distal portion 6 may for example be made from a polymer material, notably chosen from polyvinyl chloride, polyurethane, a polyamide, a polyolefin.

[0090] The tube forming this flexible distal portion 6 may for example have a thickness of 1 to 10 mm, preferably 2 to 5 mm.

[0091] Preferably, one or more cables 7 are inserted into the internal cavity of the body 3. These may be electrical cables, optical fibers, or others. They may in particular provide an electrical power supply to the sensor 2, and / or allow an exchange of data or instructions to or from the sensor 2. The cable(s) 7 are connected to the sensor 2, in particular at the proximal end 2b thereof. At their other end, they are likely to be connected to a fixed installation.

[0092] Preferably, the body 3 itself is not a simple electric cable, but it may contain one or more electric cables.

[0093] As described above, the internal cavity of the body 3 may contain on the one hand a gas (in particular air) and on the other hand one or more solid elements such as cables. Preferably, the volume proportion of gas in the internal cavity (relative to the total volume of the internal cavity containing the gas and the solid elements) is greater than or equal to 50%, preferably greater than or equal to 60%, or 70%, or 80%, or 90%. For example, this proportion may be 50 to 99%, or 60 to 95%, or 70 to 90%.

[0094] The body 3 may have a diameter greater than or equal to 10 mm, from its proximal end 3b to its distal end 3a (i.e. its maximum external dimension is greater than or equal to 10 mm in all cross-sections, between the two ends). Preferably, this diameter may be from 10 mm to 200 mm, in particular from 20 mm to 100 mm, for example again from 30 mm to 80 mm, and this over the entire length of the body 3, from its proximal end 3b to its distal end 3a. By way of example, this diameter may be approximately 25 mm, or approximately 40 mm, over the entire length of the body 3, from its proximal end 3b to its distal end 3a.

[0095] Preferably and as illustrated, the device 1 comprises a termination 4 fixed to the proximal end 3b of the body 3. This termination 4 may have one or more functions among the sealing of the internal cavity of the body 3, the fixing of the device 1 to a frame (as will be detailed below) and the integration of one or more remote functions of the sensor 2 (the termination 4 may thus comprise electronic components, for example a data processing module equipped with a processor, a memory, and a wired or wireless communication interface).

[0096] As illustrated, the cable(s) 7 may pass through the termination 4 and have a free portion on the proximal side of the termination 4, for connection to a fixed installation. Alternatively, the cable(s) 7, or a portion of the cables 7, may be connected to a connection module in the termination 4. The termination 4 may then have one or more connectors for connecting one or more external cables thereto. In this case, the power supply or data or instructions pass through this or these external cables, the module of the termination 4, and the cable(s) 7 located in the body 3. The termination 4 may obstruct the internal cavity of the body 3, at its proximal end 3b, as illustrated.

[0097] Any attachment method can be used to attach the sensor 2 to the body

[0098] 3, and to fix the termination 4 to the body 3: for example gluing, screwing, clipping, welding.

[0099] A preferred method of fixing the sensor 2 is the forceful insertion of a projection of the sensor 2 located at the proximal end 2b thereof into the body 3. The dimensions of the projection are adapted to those of the body, so as to ensure fixing. The projection may optionally include external reliefs such as circumferential grooves making it possible to improve the strength of the fixing.

[0100] Similarly, a preferred method of fixing the termination 4 is the forceful insertion of a projection of the termination 4 (distal side thereof) into the body 3. The dimensions of the projection are adapted to those of the body, so as to ensure fixing. The projection may optionally include external reliefs such as circumferential grooves to improve the strength of the fixing.

[0101] Figure 2 illustrates a device 1 with a variant for the termination

[0102] 4. In this variant, the termination 4 is tubular and has an internal cavity, which communicates with and may be in the extension of the internal cavity of the body 3. A fixing part 4', such as a collar, may be arranged at the junction between the body 3 and the termination 4 to ensure their fixing, although any other method of fixing as described above is also possible.

[0103] Figure 3 illustrates several possibilities for the positioning of the sensor 2 relative to the body 3. In a first possibility A, which is consistent with what is also illustrated in Figures 1 and 2, the sensor 2 is partially inserted into the body 3, and protrudes distally therefrom. In other words, the distal end 2a of the sensor 2 is located distally relative to the distal end 3a of the body 3, and the proximal end 2b of the sensor 2 is located proximally relative to the distal end 3a of the body 3. The distal end of the device is the distal end 2a of the sensor 2.

[0104] In a second possibility B, the sensor 2 is fully inserted into the body 3, and the longitudinal position of its distal end 2a coincides with that of the distal end 3a of the body 3 (and corresponds to the distal end of the device). The proximal end 2b of the sensor 2 is located proximally relative to the distal end 3a of the body 3.

[0105] In a third possibility C, the sensor 2 is fully inserted into the body 3, and the body 3 protrudes distally from the sensor 2. In other words, the distal end 2a of the sensor 2 is located proximally relative to the distal end 3a of the body 3, and the proximal end 2b of the sensor 2 is also located proximally relative to the distal end 3a of the body 3. The distal end of the device is the distal end 3a of the body 3.

[0106] In another possibility not illustrated, the longitudinal position of the proximal end 2b of the sensor coincides with that of the distal end 3a of the body 3, the sensor 2 then not being inserted into the body 3. The distal end of the device is then the distal end 2a of the sensor 2.

[0107] Figure 4 illustrates an alternative for fixing the sensor 2 to the body 3. In this alternative, an intermediate connector 9 is used. In this case, the proximal end 2b of the sensor 2 may be located distally relative to the distal end 3a of the body 3. The sensor 2 is fixed to the intermediate connector 9, for example by screwing; the intermediate connector 9 is fixed to the body 3, for example by force-fitting a projection thereof into the body 3. The dimensions of the projection are adapted to those of the body, so as to ensure fixing. The projection may optionally include external reliefs such as circumferential grooves to improve the strength of the fixing.

[0108] Although not shown, an intermediate connector may also be present, in the same way, between termination 4 and body 3.

[0109] As indicated above, the body 3 may consist solely of the flexible distal portion 6. Alternatively, the body 3 may comprise two or more successive portions between the distal end 3a and the proximal end 3b. The successive portions may have different rigidity. For example, there may be a flexible distal portion 6 and a rigid proximal portion. There may also be alternating flexible and rigid portions. This may make it possible to optimize the conformation of the device in the liquid, in particular when the mass of liquid comprises a static part and a part subject to a flow.

[0110] An example of this configuration is given with reference to Figure 5. In this example, the body 3 comprises three portions: the flexible distal portion 6, a rigid middle portion 10, and a flexible proximal portion 11.

[0111] The characteristics of each flexible portion may be the same as those described above in relation to the flexible distal portion.

[0112] The or each rigid portion may be made of plastic or metal. Preferred metal materials are titanium and stainless steel. Preferred plastic materials are polyamides, acrylonitrile butadiene styrene (ABS) and polyoxymethylene (POM).

[0113] Each portion can be formed by a dedicated part, the parts being fixed together to form the body 3. Each portion can be formed by several assembled parts, possibly made of different materials.

[0114] In the illustrated example, the flexible distal portion 6 is formed by a distal part 12, the rigid middle portion 10 is formed by a middle part 13 and the flexible proximal portion 11 is formed by a proximal part 14.

[0115] Each part is tubular, so that the body 3 resulting from the assembly of these parts is itself tubular. The shape of the internal cavity may however differ from one part to another. In the example illustrated, the middle part 13 has an internal cavity of smaller dimensions than the proximal 14 and distal 12 parts.

[0116] The parts of the body 3 may be fixed by any suitable fixing method, as described above, and in particular by force-fitting. Thus, a rigid part may comprise a projection allowing insertion into a flexible part, as described above. In the example illustrated, the middle part 13 comprises two projections at its two proximal and distal ends, each projection being force-fitted into an adjacent flexible part.

[0117] The or each rigid portion, for example the middle piece 13 above, may have a total length of, for example, 2 cm to 25 cm, or 3 cm to 15 cm, or 4 cm to 10 cm. Each projection inserted into an adjacent flexible piece may have a length of 0.5 to 10 cm, preferably 1 to 4 cm. The remainder of the rigid portion, excluding the inserted projections, may have a length of less than or equal to 5 cm, or 2 cm, or 1 cm. It may be, for example, 0.1 to 1 cm.

[0118] The device 1 may also comprise one or more elements enabling it to be fixed to a frame. By “frame” is meant a stationary constructed structure (or monument), which may in particular be a canal, a pipeline, a channel, a fluid conduit, or an access structure to one of these (for example a well or manhole).

[0119] For example, termination 4 may include fastening elements, such as one or more tabs allowing the insertion of screws.

[0120] Alternatively, and as can be seen in Figure 6, a sheath 15 can be added to the device 1 surrounding all or part of the termination 4, and preferably enclosing it in a fixed manner. This sheath 15 can serve as a fixing part for a frame and can include fixing elements, such as one or more tabs allowing the insertion of screws.

[0121] Optionally, and as also visible in Figure 6, a guide 16 may extend distally from or in line with the sheath 15 so as to surround and protect a portion of the body 3. The guide 16 is preferably flexible. Clearance is preferably provided between the body 3 and the guide 16. This may allow the body 3 and the sensor 2 to slide in the guide 16 in order to easily remove this assembly, for example for maintenance, and to put it back in position.

[0122] The guide 16 can be fixed to the sheath 15 by any means, and in particular by a fixing piece 21 surrounding the guide 16 and the sheath 15 at their junction, as illustrated.

[0123] For example, the guide 16 and the sheath 15 may be two tubes of the same external diameter. These tubes may be grooved. The sheath 15 may be more rigid than the guide 16. For example, the sheath 15 may be made of the same material as the guide 16 (for example polyvinyl chloride) but have a greater thickness. For illustration purposes only, if the sensor 2 and the body 3 have a maximum diameter of 25 mm, a guide 16 and a sheath 15 having an external diameter of 40 mm may be used.

[0124] In variants not illustrated, a device 1 may comprise several sensors 2, each sensor 2 being associated with a respective tubular body 3 as described above. Each set of sensor 2 and tubular body 3 may be associated with a separate termination 4, as described above. Alternatively, a single termination 4 may be connected to several tubular bodies 3. This single termination 4 may comprise separate portions connected to each tubular body 3. This may make it possible to centrally collect the signals or information from the different sensors 2.

[0125] The liquid analysis device described herein may be installed in various environments. Preferably, it is a water analysis device, which may be installed in a networked sewerage system, in a wastewater treatment plant, an industrial water treatment plant, in a rainwater network (in particular a collector), in a water discharge network in a natural environment, in a pipe of an industrial installation, or which may be installed in contact with water in a natural environment (fresh or brackish surface water, groundwater). Alternatively, the device may be a device for analyzing a liquid other than water, for example an oil, in particular in a pipe of an industrial installation.

[0126] Preferably, the liquid being analyzed is a charged liquid, i.e. it contains suspended solids. Suspended solids may include fibers, fibrous objects (such as wipes, papers, tow, masks), organic debris (including plant debris, droppings, food debris, grease particles), household and industrial waste (including manufactured objects or plastic or metal particles), mineral matter (sand, gravel, etc.).

[0127] Referring to Figure 7, the device 1 may be attached to a frame 17. In the example illustrated, the attachment to the frame 17 is effected by means of one or more arms 18 extending from the frame 17, the termination 4 being attached, for example clamped, in this or these arms 18.

[0128] At least part of the device 1 is immersed in the liquid. In some cases, the entire device 1 may be immersed in the liquid. It is also possible for the liquid level to vary over time, so that the device 1 is more or less immersed at different times.

[0129] The liquid in which the device 1 is immersed may have a static volume and a volume subject to a flow.

[0130] A mass of liquid can be considered static if it is not subject to a flow having a group velocity greater than or equal to 0.01 m / s. The group velocity is the average velocity over the cross-sectional area of ​​the flow, which can be determined according to ISO 748:2021. The volume of liquid subjected to a flow is shown in light gray on the diagram and the direction of flow is identified by an arrow. The liquid flow can have a group velocity of 0.01 to 12 m / s, for example 0.1 to 8 m / s. The liquid can have a viscosity of 10, for example -3 at 1 Pa.s, preferably 10 -3 at 10- 2 Not.

[0131] Preferably, the sensor 2 is located in the circulating liquid flow. Preferably, the termination 4 is either located outside the liquid or located in a substantially static volume of liquid. The body 3 is preferably at least partially located in a circulating liquid flow.

[0132] For example, the sensor 2 may be located in a circulating liquid flow having a height (perpendicular to the mean direction of flow) greater than or equal to at least twice the maximum diameter of the sensor 2, preferably greater than or equal to at least three times, or at least five times, or at least ten times, the maximum diameter of the sensor 2.

[0133] For example, as illustrated, a distal portion of the device 1, including the sensor 2 and all or part of the body 3, is arranged in a pipe (or a channel, or a channel) in which the liquid circulates, while a proximal portion of the device 1, including the termination 4 and optionally a portion of the body 3, is located outside the pipe, for example in a manhole providing access to the pipe.

[0134] Preferably, a proximal portion of the device 1, including the termination 4 and a portion of the body 3, is oriented essentially vertically. A distal portion of the device 1, including the sensor 2 and a portion of the body 3, may take a different orientation or be curved, depending on the properties of the liquid flow. When subjected to the flow, the sensor 2 may for example adopt an essentially horizontal orientation. Preferably, the sensor 2 and at least a portion of the flexible distal portion 6 are oriented in situ with a longitudinal axis 5 essentially aligned with the mean direction of the flow.

[0135] Figure 8 shows another method of fixing the device 1 to the frame 17. In this case, the frame 17 comprises a well or manhole closed by a plate 19, and the device 1 is inserted and fixed in an orifice of the plate 19. In the example illustrated, the fixing is carried out by means of a sheath 15 of the device 1 as described above.

[0136] Figure 9 shows another method of fixing the device 1 to the frame 17. In this case, the fixing to the frame 17 is carried out by means of one or more arms 18 extending from the frame 17 as described in connection with Figure 7, with the difference that the device 1 is provided with a sheath 15 as described above, which is itself fixed to the arm(s) 18.

[0137] Figure 10 shows the same method of attaching the device 1 to the frame 17, except that the device 1 includes a guide 16 extending distally from the sheath 15, as described above. The guide 16 allows the device 1 to be held in position relative to the frame 17. The guide 16 may be adapted to be submerged if necessary, while the sheath 15 may preferably remain non-submerged.

[0138] The sensor 2 may comprise a housing having a compartment containing measuring equipment. The housing may be provided with one or more holes allowing the liquid to enter the compartment.

[0139] Sensor 2 is a chemical or biological sensor (which also includes chemical and biological sensors, and biochemical sensors). This means that the sensor is suitable for performing a measurement associated with a chemical reaction and / or a biological phenomenon. It may be, for example, a conductivity sensor, a pH sensor, a biosensor, an oxygen sensor, a multiparametric sensor (i.e., a sensor measuring several different parameters). Sensor 2 provides a signal, preferably an electrical signal or an optical signal, generated as a function of the occurrence, nature, or intensity of a chemical and / or biological reaction or phenomenon. For example, sensor 2 may incorporate an electrochemical or piezoelectric measuring element. A preferred type of sensor 2 is a biosensor.

[0140] A biosensor is a sensor equipped with electrodes and capable of generating an electrical signal based on the activity of biological entities, such as cells, antibodies, enzymes, or preferably microorganisms (particularly bacteria) present on the surface of at least one of the electrodes. The metabolism of microorganisms involves oxidation-reduction reactions generating electrons: part of the energy produced can thus be recovered to generate an electrical signal. The microorganisms are preferably indigenous microorganisms, naturally present in the liquid analyzed. Adapted to the environment and representative of the site, they are sensitive to any change in the quality of the liquid.

[0141] The biosensor may have an electrical power supply, or operate without an electrical power supply, as appropriate. The biosensor may sometimes require an oxygen supply, in which case this may be provided via the internal cavity of the body 3, which may be filled with air. Gas communication between this internal cavity and the environment may be provided, for example in the termination 4, for example by means of a liquid-impermeable and gas-permeable membrane.

[0142] For example, in the case of a biosensor, a compartment of the sensor may be filled with water, the electrodes being fully or partially immersed in the water. For example, the anode may be fully immersed in water, while the cathode may have a face in contact with the water, and a face in contact with the air from the internal cavity of the body 3.

[0143] Advantageously, the external shape of the device 1 is selected and adjusted to minimize any interaction with suspended solids. Referring to Figures 1 to 5, the device 1 comprises a longitudinal external wall 8. This is the external wall that extends along the longitudinal axis 5. This longitudinal external wall 8 may be composite, since it may be formed by at least two elements, namely the sensor 2 and the body 3, and possibly more. The concept of longitudinal external wall 8 excludes the transverse wall located at the distal end of the device.

[0144] In the examples of figures 1, 2 and 3A, the longitudinal external wall 8 is constituted by the longitudinal external wall of the sensor 2 and by the longitudinal external wall of the body 3 formed from a single piece.

[0145] In the examples of Figures 3B and 3C, the longitudinal external wall 8 is constituted by the longitudinal external wall of the body 3 only.

[0146] In the example of Figure 4, the longitudinal external wall 8 is constituted by the longitudinal external wall of the sensor 2, by the longitudinal external wall of the intermediate connector 9 and by the longitudinal external wall of the body 3 formed from a single piece.

[0147] In the example of Figure 5, the longitudinal external wall 8 is constituted by the longitudinal external wall of the sensor 2, by the longitudinal external wall of the intermediate connector 9, and by the longitudinal external walls of the distal part 12, of the middle part 13 and of the proximal part 14 forming the body 3.

[0148] The longitudinal external wall 8 is preferably characterized by the absence of any relief or roughness in the longitudinal direction likely to serve as a point of attachment for objects or materials in suspension.

[0149] In order to clarify this characteristic, it is useful to define that the longitudinal external wall 8 is formed by a set of longitudinal generating lines. With reference to Figure 11, the longitudinal generating lines 8a, 8b are defined as being the lines located at the intersection between the longitudinal external wall 8 and a section (a plane) containing the longitudinal axis 5. When the longitudinal axis 5 is curved or includes a curved portion, a theoretical device can be defined geometrically deformed relative to the real device so that the longitudinal axis 5 is rectilinear. The longitudinal generating lines of the real device then correspond to the longitudinal generating lines of the theoretical device, after deformation to result in the real device.

[0150] For each longitudinal generating line 8a, 8b, a linear distance I can be defined from the proximal end 3b of the tubular body, and this, up to the distal end 20 of the device (which can correspond to the distal end 2b of the sensor 2 and / or to the distal end 3b of the body 3). Each position along the longitudinal generating line 8a is defined by a single linear distance I, and at each of these positions, a distance D(l) can be defined between said longitudinal generating line 8a and the longitudinal axis 5. It is also possible to define as Dmax(l) the maximum of D between the proximal end 3b of the body 3 and the linear position I. In the example illustrated in part A of figure 11, the device has a decreasing transverse extension in the distal direction starting from the proximal end 3b of the body 3. In this case, Dmax(l) is constant along the device and is equal to D(0).In the opposite example, not shown, in which the device has an increasing transverse extension in the distal direction from the proximal end 3b of the body 3, then Dmax(l) = D(l) at any position I.

[0151] Preferably, the following condition is met by traversing each longitudinal generating line 8a from a starting point P to the proximal end 2b of the sensor: in any linear position I for which D(l) = Dmax(l), the longitudinal axis 5 forms, with the tangent to the longitudinal generating line 8a, an angle less than or equal to 90°. The point P is that, on the longitudinal generating line 8a, which is located at a linear distance of 10 cm from the proximal end 2b of the sensor, proximally relative to the latter.

[0152] This angle is measured in an oriented manner, and is defined by considering the proximal to distal orientation for the longitudinal axis 5 and the orientation of the increasing linear position I for the tangent to the longitudinal generating line 8a. It is also conventionally considered that the longitudinal generating line 8a is located above the longitudinal axis 5, in the plane in which the angle is measured.

[0153] In part A of Figure 11, different possible shapes for portions of the longitudinal external wall 8 are schematically illustrated as an example. In the left part, the longitudinal external wall 8 has a truncated cone shape. At a point X on this part, the angle a between the longitudinal axis 5 and the tangent to the longitudinal generating line 8a is negative and therefore less than 90°. In the middle part, the longitudinal external wall 8 has a cylindrical shape. At a point Y on this part, the angle between the longitudinal axis 5 and the tangent to the longitudinal generating line 8a is zero and therefore less than 90°. In the right part, the longitudinal external part 8 has a step, comprising a section perpendicular to the longitudinal axis 5. At a point Z on this section, the angle between the longitudinal axis 5 and the tangent to the longitudinal generating line 8a is equal to -90°, it is therefore less than 90°.Thus, the condition stated above is respected for the device illustrated in part A of figure 11, whatever the position of point P.

[0154] Part B of Figure 11 illustrates a situation in which the condition stated above is not met if point P is located proximally with respect to X. Indeed, at point X, the angle a between the longitudinal axis 5 and the tangent to the longitudinal generating line 8a is positive and greater than 90° and, at this position, the distance D(l) is equal to Dmax(l) (because, by following the longitudinal generating line 8a from the proximal end 3b of the body 3 to the linear position I, the distance to the longitudinal axis 5 is maximum at this linear position I). It can be seen that at point Y also the angle between the longitudinal axis 5 and the tangent to the longitudinal generating line 8a is positive and greater than 90°; however, at this point Y, the distance D(l) is strictly less than Dmax(l), so that the shape at point Y is not a cause of non-compliance with the above condition.

[0155] Through the condition expressed above, situations are excluded in which, on a certain proximal portion relative to the proximal end 2b of the sensor 2, the longitudinal external wall 8 comprises one or more recesses (or hollows) oriented towards the proximal end 3b of the body, when the longitudinal external wall 8 does not have a transverse or radial extension greater upstream of this or these recesses (i.e. in a proximal position relative to them). Indeed, such recesses are likely to serve as attachment points for objects or suspended matter circulating in the liquid flow, given that the device generally tends to orient itself in the liquid flow in the proximal - distal direction.

[0156] In some variants, the above condition is met, with point P being located proximally at a linear distance of 20 cm from the proximal end of the sensor; or point P being located proximally at a linear distance of 50 cm from the proximal end of the sensor; or point P being located at the proximal end of the body. In some variants, the above condition is met up to the distal end of the device.

[0157] In some variants, the following more restrictive condition is met by traversing each longitudinal generating line from a starting point P to the proximal end of the sensor: in any linear position I, the longitudinal axis forms, with the tangent to the longitudinal generating line, an oriented angle less than or equal to 90°. Point P is located proximally at a linear distance of 10 cm from the proximal end of the sensor; or, in some variants, at a linear distance of 20 cm from the proximal end of the sensor, or at a linear distance of 50 cm from the proximal end of the sensor, or point P is located at the proximal end of the body. With this more restrictive condition, the presence of a portion like that of point Y in part B of figure 11 is also excluded. Any recess oriented towards the proximal end 3b is therefore excluded.In some variants, this more restrictive condition is met up to the distal end of the device.

[0158] In certain variants, the device 1 does not have a “step”, that is to say a longitudinal external wall portion 8 oriented transversely (essentially perpendicular to the longitudinal axis).

[0159] Preferably, by traveling along each longitudinal generating line 8a from a starting point P (located proximally at a linear distance of 10 cm, or 20 cm, or 50 cm, relative to the proximal end of the sensor, or located at the proximal end of the body) to the proximal end of the sensor (or even to the distal end of the device), in any linear position I, the longitudinal axis forms, with the tangent to the longitudinal generating line, an oriented angle strictly less than 90°.

[0160] In certain variants, by traversing each longitudinal generating line 8a from a starting point P (located proximally at a linear distance of 10 cm, or 20 cm, or 50 cm, relative to the proximal end of the sensor, or located at the proximal end of the body) to the proximal end of the sensor (or even to the distal end of the device), in any linear position I, the longitudinal axis 5 forms, with the tangent to the longitudinal generating line 8a, an oriented angle strictly less than or equal to 45°, or 30°, or 20°, or 10°, or 5°. In certain variants, this angle is substantially zero, which means that the device 1 has a cross-section perpendicular to the longitudinal axis 5 which is substantially constant over the portion considered. In other words, the device 1 has an essentially cylindrical shape (with a circular base or not) on the portion considered (subject to the curvature of the assembly, along the longitudinal axis).Where applicable, the total cross-sectional area (area bounded by the external perimeter of the device) varies by less than 20%, or less than 15%, or less than 10%, or less than 5%, from one end of the portion under consideration to the other.

[0161] All of the above conditions do not apply to termination 4, since this is in principle intended to be fixed either outside the liquid or in essentially static liquid, and is therefore in principle not subject to a circulating flow of liquid.

[0162] In order to avoid any marked relief or asperity not only in the longitudinal direction, but also in the radial direction, it is preferred that both the sensor 2 and the body 3 have a cross-section perpendicular to the longitudinal axis 5 whose external perimeter is totally curved, that is to say devoid of any angular point (and this from the distal end 2a of the sensor 2 to the proximal end 3b of the body 3). Preferably this cross-section has an external perimeter of circular, elliptical, oval or ovoid shape, and more preferably of circular shape. Preferably, the sensor 2 and the body 3 have a cross-section having an external perimeter of the same shape, more preferably of circular shape.

[0163] Preferably, the sensor 2 and the body 3 are devoid of any external edge.

[0164] Preferably, the longitudinal external wall 8 is devoid of any flat part.

[0165] Preferably, the longitudinal external wall 8 is cylindrical with a circular base.

[0166] However, alternatively, the sensor 2 and / or the body 3 may have a polygonal cross-section, for example square, rectangular or hexagonal. The sensor 2 and / or the body 3 may have a cylindrical shape with a polygonal base, for example square, rectangular or hexagonal.

[0167] Preferably, the longitudinal external wall 8 has a roughness Ra less than or equal to 60 pm, preferably less than or equal to 40 pm, for example between 0.1 and 60 pm or between 0.1 and 40 pm, at any point from the proximal end 3b of the body 3 to the distal end 20 of the device. Preferably, any portion of the longitudinal external wall 8 formed by the sensor 2 has a roughness Ra less than or equal to 1.6 pm, preferably less than or equal to 0.8 pm, for example between 0.1 and 1.6 pm or between 0.1 and 0.8 pm.

[0168] Surface roughness measurements can be performed according to ISO 21920-1:2021.

[0169] A relatively low surface roughness also helps minimize the attachment of suspended matter, particularly small particles. A very low surface roughness is particularly useful for sensor 2, which is the part of the device most sensitive to the attachment of objects or materials. It also helps limit the development of unwanted biofilms near electrodes or other sensitive parts of the device.

[0170] Roughness can be adjusted by mechanical abrasive treatment and / or chemical treatment for example.

[0171] The length (along the longitudinal axis 5) of the device 1 between the distal end 20 of the device and the proximal end 3b of the body may be at least 50 cm, preferably at least 1 m, more preferably at least 1.50 m. It may be, for example, from 50 cm to 3 m, or from 1 m to 2.50 m.

[0172] The length (along the longitudinal axis 5) of the flexible distal portion 6 of the body 3 may be at least 50 cm, preferably at least 1 m, more preferably at least 1.50 m. It may be, for example, from 50 cm to 2.50 m, or from 1 m to 2 m.

[0173] The length (along the longitudinal axis 5) of the sensor 2 (from its distal end 2a to its proximal end 2b) may be less than or equal to 50 cm, preferably less than or equal to 40 cm or 30 cm or 20 cm. It may be, for example, 5 to 50 cm, or 10 to 30 cm.

[0174] Where applicable, the maximum diameter of the cross-section of the device 1 varies by less than 20%, or less than 15%, or less than 10%, or less than 5%, over the entire length from the distal end 2a of the sensor 2 to the proximal end 3b of the body 3.

[0175] Preferably, the density of the assembly constituted by the sensor 2 and the first 50 cm of the tubular body 3 extending from its distal end 3a is 1 to 1.2 according to the ISO 1183-1:2019 standard.

[0176] Preferably, the density of the assembly consisting of the sensor 2 and the first 20 cm of the tubular body 3 extending from its distal end 3a is from 1 to 1.2 according to the ISO 1183-1:2019 standard. Preferably, the density of the assembly consisting of the sensor 2 and the flexible distal portion 6 of the tubular body 3 is from 1 to 1.2 according to the ISO 1183-1:2019 standard.

[0177] Preferably, the density of the assembly consisting of the sensor 2 and the tubular body 3 is 1 to 1.2 according to standard ISO 1183-1:2019.

[0178] With respect to the above density ranges, the cavity of the tubular body 3 preferably comprises a gas, more preferably air, at atmospheric pressure (as described above), which helps to prevent the density from being too high.

[0179] The sensor 2 preferably has a density greater than 1, and more particularly greater than 1.2; and the tubular body 3 preferably has a density less than 1. Adjusting the dimensions of these two elements makes it possible to obtain a density of 1 to 1.2 for the entire sensor 2 and all or part of the tubular body 3, as mentioned in the preceding paragraphs.

[0180] These density ranges ensure satisfactory buoyancy in the flow.

[0181] Density is usually expressed relative to pure water at a temperature of 20°C. It is therefore dimensionless.

Claims

Claims 1. Liquid analysis device (1) having a longitudinal axis (5) and comprising: - a tubular body (3) extending along the longitudinal axis (5) between a proximal end (3b) and a distal end (3a), and comprising a flexible distal portion (6) extending from the distal end (3a), the flexible distal portion (6) having a rigidity of 0.4 to 4 kg according to standard ISO 10619-1:2017, method A2; - an immersible biological or chemical sensor (2) extending along the longitudinal axis (5) between a proximal end (2b) and a distal end (2a), the sensor being (2) fixed to the distal end (3a) of the body (3).

2. Device (1) according to claim 1, in which the assembly constituted by the sensor (2) and the first 50 cm of the tubular body (3) extending from its distal end (3a) has a density of 1 to 1.2 according to standard ISO 1183-1:2019.

3. Device (1) according to claim 1 or 2, in which the sensor (2) has a maximum diameter less than or equal to 200 mm.

4. Device (1) according to one of claims 1 to 3, in which the flexible distal portion (6) of the body (3) has a minimum radius of curvature less than or equal to 500 mm.

5. Device (1) according to one of claims 1 to 4, in which the flexible distal portion (6) of the body (3) has a length of at least 50 cm, preferably at least 1 m, more preferably at least 1 m 50, along the longitudinal axis (5).

6. Device (1) according to one of claims 1 to 5, having a longitudinal external wall (8) formed by a set of longitudinal generating lines (8a, 8b), and in which the following condition is met when traveling along each generating line longitudinal (8a, 8b) from a starting point P to the proximal end (2b) of the sensor (2): let D(l) be the distance between the longitudinal generating line (8a) and the longitudinal axis (5) at any linear position I along the longitudinal generating line (8a); let Dmax (I) be the maximum of D between the point P and the linear position I; then, at any linear position I for which D(l) = Dmax(l), the longitudinal axis (5) forms, with the tangent to the longitudinal generating line (8a), an angle less than or equal to 90°; the point P being located proximally at a linear distance of 10 cm from the proximal end of the sensor.

7. Device (1) according to one of claims 1 to 6, having a cross section perpendicular to the longitudinal axis (5) substantially constant from the proximal end (3b) of the body (3) to the distal end (20) of the device (1).

8. Device (1) according to one of claims 1 to 7, having a longitudinal external wall (8) which has a roughness Ra less than or equal to 60 pm, preferably less than or equal to 40 pm according to standard ISO 21920-1:2021, at any point from the proximal end (3b) of the body (3) to the distal end (20) of the device (1).

9. Device (1) according to one of claims 1 to 8, in which the sensor (2) has a longitudinal external wall having a roughness Ra less than or equal to 1.6 pm, preferably less than or equal to 0.8 pm according to standard ISO 21920-1:2021.

10. Device (1) according to one of claims 1 to 9, comprising a termination (4) fixed to the proximal end (3b) of the body (3).

11. Device (1) according to one of claims 1 to 10, in which the sensor (2) is a biosensor.

12. Device (1) according to one of claims 1 to 11, comprising a part (15) for fixing to a frame (17) and / or comprising a flexible guide (16) for the tubular body (3).

13. Installation for analyzing a liquid, comprising a liquid analysis device (1) according to one of claims 1 to 12 fixed to a frame (17), the liquid analysis device (1) being immersed in a liquid.

14. Installation according to claim 13, in which the sensor (2) and at least part of the flexible distal portion (6) of the body (3) are subjected to a flow of circulating liquid.

15. Installation according to claim 13 or 14, for the analysis of circulating water, and preferably for the analysis of water from a sanitation network.

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