Fluid measuring device and fluid delivery system

Abstract

The utility model provides a fluid measuring device and a fluid conveying system. The fluid measuring device includes an outer cylinder, a float and a sensing module; the outer cylinder is used for fluid flow, the float is accommodated in the inner cavity of the outer cylinder, the sensing module is arranged on the side wall of the outer cylinder and is used to sense the position change of the float to output the state information representing the fluid, and the float is penetrated with a through hole for the fluid to pass through. During the working process, the through hole is arranged in the float to allow the fluid to pass through, so that the large particles in the fluid also pass through the through hole preferentially, and the size of the through hole is relatively large, so that the large particles can pass through easily, and at the same time, the large particles flowing between the float and the outer cylinder are reduced, thereby preventing the float and the outer cylinder from getting stuck.

Description

Technical Field

[0001] The utility model relates to the field of fluid detection, in particular to a fluid measuring device and a fluid conveying system. Background Art

[0002] In the production process, it is usually necessary to use a float level gauge to measure fluid parameters. However, during the measurement process, due to the presence of large particles in the fluid, it is easy to cause blockage, causing the float to be stuck on the side wall of the outer cylinder, which can easily cause measurement errors. Utility Model Content

[0003] The utility model provides a fluid measuring device and a fluid conveying system, which can prevent blockage caused by large particles in the fluid and prevent the float from being stuck on the side wall of the outer cylinder, thereby preventing measurement errors.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the utility model provides a fluid measuring device, which includes:

[0006] Outer cylinder, float and sensing module;

[0007] The outer cylinder is used for fluid flow, the float is movably accommodated in the inner cavity of the outer cylinder, the sensing module is arranged on the side wall of the outer cylinder and is used to sense the position change of the float to output status information representing the fluid, and the float is penetrated by a through hole for fluid to pass through.

[0008] In the above technical solution, the fluid measuring device can sense the real-time position of the float through the sensing module. When the position of the float changes, the output electrical signal of the sensing module also changes accordingly, thereby realizing the measurement operation of the fluid. In addition, the through hole is arranged in the float to allow the fluid to pass through, and it does not need to be distributed on both sides of the float, so that the radial size of the through hole can be set larger. For the circulating fluid, the pressure required for the fluid to pass through the through hole is less than the pressure required for the fluid to flow through the float and the outer cylinder, making it easier for the fluid to pass through the through hole, so that large particles in the fluid also preferentially pass through the through hole. The size of the through hole is relatively large, which also makes it easy for large particles to pass through, and at the same time reduces the large particles flowing between the float and the outer cylinder, thereby preventing the float from getting stuck with the outer cylinder. Moreover, since the float can move freely in the radial direction of the outer cylinder, the distance between the float and the inner wall of the outer cylinder is also variable. When large particles flow through, the float can move radially to facilitate the passage of large particles, further reducing the probability of getting stuck.

[0009] Optionally, the sensing module is an electromagnetic sensor, which is used to detect changes in the magnetic field generated by the float during a position change and to change an output electrical signal of the electromagnetic sensor.

[0010] In the above technical solution, by setting an electromagnetic sensor to detect the change of the magnetic field when the float position changes, the negative impact on the fluid can be reduced as much as possible, thereby ensuring the fluid quality and flow efficiency.

[0011] Optionally, the sensing module includes a shell and a magnetic induction resistance wire, the shell is arranged on the side wall of the outer cylinder, and the magnetic induction resistance wire is arranged in the shell and is used to detect the position change of the float.

[0012] In the above technical solution, the shell is used to shield and protect the magnetic induction resistance wire, thereby ensuring that the magnetic induction resistance wire can detect the change of the float position more accurately.

[0013] Optionally, the sensing module further includes a terminal, which is disposed on the housing and electrically connected to the magnetic induction resistance wire.

[0014] In the above technical solution, a terminal is provided to supply energy to the magnetic induction resistance wire, thereby improving the use flexibility of the overall fluid measuring device.

[0015] Optionally, the float is cylindrical, the through hole penetrates the float along the axial direction of the float, and the central axis of the through hole coincides with the central axis of the cylinder of the float.

[0016] In the above technical solution, by limiting the through hole at the center of the cylindrical float, it is possible to avoid the float being easily deflected due to the setting position of the through hole.

[0017] Optionally, the axial length of the float is greater than the inner diameter of the outer cylinder.

[0018] In the above technical solution, by limiting the relationship between the axial length of the float and the inner diameter of the outer cylinder, it is possible to prevent the float from being deflected and reversed in the inner cavity of the outer cylinder to affect the measurement effect.

[0019] Optionally, the outer cylinder comprises a liquid inlet section, a detection section and a liquid outlet section which are detachably connected in sequence, the float is accommodated in the detection section, and the sensing module is arranged on a side wall of the detection section.

[0020] In the above technical solution, by setting the outer cylinder as a detachable structure, on the one hand, the maintenance and replacement cost of the outer cylinder can be reduced, and on the other hand, the maintenance of the float is convenient.

[0021] Optionally, the fluid measuring device further comprises a limiter, the limiter being accommodated in at least one of the liquid inlet section and the liquid outlet section, the limiter being used to limit the float to be movable within the detection section.

[0022] In the above technical solution, a limiter is provided to limit the floating position of the float, thereby preventing the float from moving beyond the sensing stroke of the sensing module due to excessive flow or flow pressure.

[0023] Optionally, the stopper has a conical structure, and the cross-sectional area of ​​one end of the stopper close to the float is smaller than the cross-sectional area of ​​the other end.

[0024] In the above technical solution, limiting the shape of the stopper helps to increase the flow efficiency of the fluid, thereby driving the movement of large particles and preventing too many large particles from gathering in the detection section.

[0025] An embodiment of the utility model further provides a fluid delivery system, comprising a fluid measuring device.

[0026] The fluid delivery system comprises a fluid measuring device, which has all the functions of a fluid measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic structural diagram of a fluid measuring device provided in an embodiment of the utility model.

[0029] Icon: 100-fluid measuring device; 110-outer cylinder; 111-liquid inlet section; 112-detection section; 113-liquid outlet section; 120-float; 121-through hole; 130-sensing module; 131-housing; 132-sensing resistance wire; 133-binding post; 140-limiter; 150-connector. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] Unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0038] The inventors have found that the float level gauge of the related art adopts a fixed rod plus float mode, and the float is mounted on the fixed rod. In harsh environments such as acidic and alkaline environments, on the one hand, not only is the fixed rod required to be made of corrosion-resistant material, but the float and the fixed rod are easily stuck due to long-term friction. Once the particles in the fluid enter between the fixed rod and the float, the float will also be stuck with the fixed rod. On the other hand, the fluid flows between the float and the inner wall of the outer shell. The fluid space between the float and the outer shell is limited and due to the limitation of the fixed rod, the fluid flow gap between the float and the inner wall of the outer shell is certain. If there are large particles in the fluid, the float and the outer shell will be stuck.

[0039] Please refer to Figure 1 The fluid measuring device 100 and the fluid delivery system provided in the embodiment of the present utility model can solve the above-mentioned problems, which will be described in detail below.

[0040] The fluid measuring device 100 includes an outer cylinder 110, a float 120 and a sensing module 130;

[0041] Among them, the outer cylinder 110 is used for fluid flow, the float 120 is accommodated in the inner cavity of the outer cylinder 110, the sensing module 130 is arranged on the side wall of the outer cylinder 110 and is used to sense the position change of the float 120 to output state information representing the fluid, and the float 120 is penetrated by a through hole 121 for fluid to pass through.

[0042] During operation, the fluid measuring device 100 can sense the real-time position of the float 120 through the sensing module 130 . When the position of the float 120 changes, the output electrical signal of the sensing module 130 also changes accordingly, thereby achieving the measurement of the fluid.

[0043] Furthermore, by providing a through hole 121 on the float 120, the fluid can also pass through the through hole 121. Compared with the prior art, the float is arranged in the shell, and the radial fluid space of the shell is distributed on both sides of the float, so that the radial dimension of the fluid flow is reduced. The through hole 121 of the present application is arranged in the float 120 to allow the fluid to pass through, and does not need to be distributed on both sides of the float 120. In this way, the radial dimension of the through hole 121 can be set larger. For the circulating fluid, the pressure required for the fluid to pass through the through hole 121 is less than the pressure between the float 120 and the outer cylinder 110, so that the fluid is easier to pass through the through hole 121. In this way, large particles in the fluid also preferentially pass through the through hole 121. The size of the through hole 121 is relatively large, which also makes it easy for large particles to pass through. At the same time, the large particles flowing between the float 120 and the outer cylinder 110 are reduced, thereby preventing the float 120 and the outer cylinder 110 from getting stuck. Furthermore, since the float 120 can move freely in the radial direction of the outer cylinder 110, the distance between the float 120 and the inner wall of the outer cylinder 110 is also variable. When large particles flow through, the float 120 can move radially to facilitate the passage of large particles, further reducing the probability of jamming.

[0044] It is worth noting that the fluid measuring device 100 may also include a feedback device, which is used to provide real-time feedback on the fluid status information output by the sensing module 130 so that the staff can understand the real-time status of the fluid. Specifically, the feedback device may also include a display unit and an alarm unit. The display unit is used for digital display feedback and may be a display instrument or a computer display, and its specific type is not limited; the alarm unit may be a speaker or a warning light, which may remind the staff through hearing or vision when an abnormal situation occurs.

[0045] In this embodiment, the sensing module 130 is mainly used to output the liquid level information and flow rate information describing the fluid; however, in other embodiments of the present invention, the sensing module 130 can also be used to output other parameter information describing the fluid, and the specific information category is not limited.

[0046] In addition, because there are many types of fluids, especially some fluids are corrosive to a certain extent, the outer cylinder 110 can be made of PP material (i.e. polypropylene, a thermoplastic addition polymer made of a combination of propylene monomers), and the float 120 can be made of PTFE material (polytetrafluoroethylene, a high molecular polymer made by polymerization of tetrafluoroethylene as a monomer). PP material and PTFE material have good corrosion resistance, so that the fluid measurement device 100 can operate for a long time in a corrosive fluid environment, thereby ensuring the stability and durability of the fluid measurement operation. Of course, there is no limitation on the specific materials of the outer cylinder 110 and the float 120. When the type of fluid changes, the materials of the outer cylinder 110 and the float 120 can be adaptively adjusted.

[0047] refer to Figure 1 The sensing module 130 is an electromagnetic sensor, which is used to detect the change of magnetic field generated by the float 120 during the position change process, and convert the magnetic field change into an output electrical signal change. Specifically, the float 120 floats up and down and changes its position. The electromagnetic sensor senses the position change of the float 120 and generates a magnetic field change. The magnetic field change can be converted into an electrical signal change. The state of the fluid, such as the flow rate or liquid level of the fluid, can be reflected according to the output electrical signal change. The fluid measuring device 100 can minimize the negative impact on the fluid as much as possible by setting an electromagnetic sensor to detect the magnetic field change when the float 120 changes its position, thereby ensuring the fluid quality and flow efficiency.

[0048] Specifically, the sensing module 130 includes a housing 131 and a magnetic induction resistance wire 132, wherein the housing 131 is disposed on the side wall of the outer cylinder 110, and the magnetic induction resistance wire 132 is disposed in the housing 131 and is used to detect the position change of the float 120. The housing 131 is used to shield and protect the magnetic induction resistance wire 132, thereby ensuring that the magnetic induction resistance wire 132 can detect the position change of the float 120 more accurately.

[0049] During the measurement process, when the position of the float 120 changes, the working resistance of the magnetic induction resistor 132 will also change accordingly, thereby causing the voltage or current to change, thereby providing feedback on the actual position of the float 120. For example, when the height of the float 120 is lower, the working resistance of the induction resistor 132 is greater; when the height of the float 120 is higher, the working resistance of the induction resistor 132 is smaller. When the voltage is fixed, the change in resistance can cause the current to change accordingly. The position information of the float 120 can be reflected according to the change in resistance and current, which can be converted into liquid level to achieve liquid level measurement.

[0050] Furthermore, the accurate calculation of the fluid flow rate can be realized according to the Bernoulli equation: p+ρgh+(1 / 2)*ρv^2=c (where p is the pressure of the fluid, ρ is the density of the fluid, v is the velocity of the fluid, h is the vertical height, g is the acceleration of gravity, and c is a constant). Thus, the fluid measuring device 100 can realize the functions of liquid level detection, flow monitoring, and flow velocity measurement.

[0051] refer to Figure 1 The sensing module 130 also includes a terminal 133, which is disposed on the housing 131 and electrically connected to the magnetic induction resistor 132. The terminal 133 is used to operate the magnetic induction resistor 132 and improves the use flexibility of the overall fluid measuring device 100.

[0052] At the same time, in order to improve the efficiency of electrical connection, the terminal 133 can be a quick-plug connector, which is convenient for plugging in or disassembling, thereby reducing the working time and labor intensity of the staff and achieving the purpose of improving labor efficiency.

[0053] refer to Figure 1 The float 120 is cylindrical, and the extension direction of the through hole 121 is consistent with the axial direction of the float 120, that is, the through hole 121 penetrates the float 120 along the axial direction of the float 120, and the central axis of the through hole 121 coincides with the central axis of the cylinder of the float 120. By limiting the through hole 121 to the center position of the cylindrical float 120, it is possible to avoid the float 120 being easily deflected due to the setting position of the through hole 121, thereby preventing the sensing module 130 from affecting the position sensing of the float 120.

[0054] Of course, in other embodiments of the present invention, under the premise of ensuring the measurement effect, the float 120 can also be in other shapes such as a truncated cone, and its specific shape is not limited.

[0055] Specifically, in order to prevent the float 120 from deflecting and changing direction in the outer cylinder 110 and affecting the measurement accuracy, the central axis of the through hole 121 can be made to coincide with the cylindrical central axis of the float 120. In addition, the axial length of the float 120 can be made greater than the inner diameter of the outer cylinder 110. By limiting the relationship between the axial length of the float 120 and the inner diameter of the outer cylinder 110, it is possible to further prevent the float 120 from deflecting and changing direction in the inner cavity of the outer cylinder 110 and affecting the measurement effect.

[0056] In this embodiment, preferably, the number of through holes 121 is one, so as to provide a larger space for the fluid to pass through, and also to allow large particles to pass through and prevent clogging; in other embodiments of the utility model, the number of through holes 121 can also be multiple. It should be noted that the multiple here refers to two or more than two, for example, the through holes 121 can be two or three, etc., and the specific number of through holes 121 is not limited. When there are multiple through holes 121, the central axis of the multiple through holes 121 can be arranged parallel to the cylindrical central axis of the float 120. In order to improve the fluidity of the fluid in the multiple through holes 121, the multiple through holes 121 can also be arranged in a staggered manner. Therefore, there is no limitation on the specific number and form of the through holes 121.

[0057] refer to Figure 1 The outer cylinder 110 includes a liquid inlet section 111, a detection section 112 and a liquid outlet section 113 which are detachably connected in sequence, the float 120 is accommodated in the detection section 112, and the sensing module 130 is arranged on the side wall of the detection section 112. By setting the outer cylinder 110 as a detachable structure, on the one hand, the maintenance and replacement cost of the outer cylinder 110 can be reduced, and on the other hand, it is convenient to maintain and replace the float 120.

[0058] It should be noted that the specific detachable connection method includes but is not limited to threaded connection and snap connection. Of course, in other embodiments of the present invention, in order to improve and reduce assembly time, the outer cylinder 110 can also be an integrally formed structure, and the side wall of the outer cylinder 110 can be provided with an inspection port, thereby achieving maintenance and replacement of the float 120.

[0059] It is worth noting that the fluid measuring device 100 further includes a stopper 140, which is accommodated in at least one of the liquid inlet section 111 and the liquid outlet section 113. Preferably, the stopper 140 may be provided in both the liquid inlet section 111 and the liquid outlet section 113. The stopper 140 is used to limit the float 120 to be movable in the detection section 112, so as to prevent the float 120 from moving beyond the sensing stroke of the sensing module 130 due to excessive flow or flow pressure. Moreover, the liquid inlet section 111 and the liquid outlet section 113 are detachably connected to the detection section 112, and the limiter 140 is arranged at the liquid inlet section 111 and the liquid outlet section 113. The limiter 140 can be disassembled by disassembling the liquid inlet section 111 and the liquid outlet section 113, so that the float 120 can be taken out of the detection section 112 for maintenance and replacement. For example, when the fluid measuring device 100 is adapted to different fluids, the float 120 can be replaced as needed to adapt to various fluids. At this time, the liquid inlet section 111 and the liquid outlet section 113 can be disassembled to replace the float 120.

[0060] In some embodiments of the present application, the liquid inlet section 111 and the liquid outlet section 113 can be threadedly connected to the detection section 112. Optionally, the liquid inlet section 111 and the liquid outlet section 113 can be formed into a hexagonal structure with an internal thread, so that they can be rotated and unscrewed using only a large hexagonal wrench, which is convenient for disassembly. Of course, it can be understood that the liquid inlet section 111 and the liquid outlet section 113 can also be other structures with internal threads, or can also be external thread structures. The present application does not make specific limitations on this, as long as it can be disassembled.

[0061] In this embodiment, the stopper 140 has a conical structure. Specifically, the stopper 140 may be a component independent of the outer cylinder 110, or may be formed by the inner wall of the outer cylinder 110. The cross-sectional area of ​​one end of the stopper 140 close to the float 120 is smaller than the cross-sectional area of ​​the other end. In this way, the float 120 can be prevented from moving out of the outer cylinder 110 by the smaller cross-sectional area, so as to achieve the limiting effect on the float 120. On the other hand, the other end of the stopper 140 away from the float 120 has a larger cross-sectional area, which is also conducive to the passage of fluid.

[0062] Furthermore, the number of the limiter 140 can be one, and the limiter 140 can be set at the liquid inlet section 111 or the liquid outlet section 113; of course, the number of the limiter 140 can also be two, and the two limiters 140 are respectively set at the liquid inlet section 111 and the liquid outlet section 113.

[0063] In addition, the fluid measuring device 100 may also include a controller, which may be a single chip microcomputer or a PLC (programmable logic controller), and the controller is used to write programs and communicate with various electrical components to realize the intelligent operation of the overall fluid measuring device 100. The controller may be a separate structure, or may be arranged in the sensing module 130 or the feedback device, and its specific arrangement is not limited.

[0064] In some embodiments of the present invention, the fluid measuring device 100 further includes a connector 150, which may be provided at at least one axial end of the outer cylinder 110 to facilitate connection with a pipeline. Optionally, connectors 150 are provided at both axial ends of the outer cylinder 110, and the connectors 150 may be unions, and both ends of the outer cylinder 110 are provided with unions, thereby facilitating connection between the fluid measuring device 100 and other components, for example, it may replace part of the pipeline for installation.

[0065] An embodiment of the utility model also provides a fluid delivery system, including the above-mentioned fluid measuring device 100, and also including a fluid source, a pump body and a connecting pipeline. The pump body is connected to the fluid source through the connecting pipeline to realize the delivery operation of the fluid source, and the fluid measuring device 100 can be installed in the connecting pipeline to perform measurement operations during fluid delivery.

[0066] The fluid delivery system includes a fluid measuring device 100 , which has all the functions of the fluid measuring device 100 .

[0067] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A fluid measuring device, characterized in that: include: An outer cylinder (110), a float (120) and a sensing module (130); The outer cylinder (110) is used for allowing fluid to flow, the float (120) is movably accommodated in the inner cavity of the outer cylinder (110), the sensing module (130) is arranged on the side wall of the outer cylinder (110) and is used for outputting information describing the state of the fluid by sensing the position change of the float (120), and the float (120) is penetrated by a through hole (121) for allowing fluid to pass through.

2. The fluid measuring device according to claim 1, characterized in that: The sensing module (130) is an electromagnetic sensor, which is used to sense the change in the magnetic field generated by the float (120) during the position change process, and convert the change in the magnetic field into an output electrical signal change.

3. The fluid measuring device according to claim 1, characterized in that: The sensing module (130) comprises a shell (131) and a magnetic induction resistance wire (132); the shell (131) is arranged on the side wall of the outer cylinder (110); the magnetic induction resistance wire (132) is arranged in the shell (131) and is used to sense the position change of the float (120).

4. The fluid measuring device according to claim 3, characterized in that: The induction module (130) further comprises a terminal (133), wherein the terminal (133) is arranged on the housing (131) and is electrically connected to the magnetic induction resistance wire (132).

5. The fluid measuring device according to claim 1, characterized in that: The float (120) is cylindrical, the through hole (121) penetrates the float (120) along the axial direction of the float (120), and the central axis of the through hole (121) coincides with the central axis of the cylinder of the float (120).

6. The fluid measuring device according to claim 5, characterized in that: The axial length of the float (120) is greater than the inner diameter of the outer cylinder (110).

7. The fluid measuring device according to any one of claims 1 to 6, characterized in that: The outer cylinder (110) comprises a liquid inlet section (111), a detection section (112) and a liquid outlet section (113) which are detachably connected in sequence, the float (120) is accommodated in the detection section (112), and the sensing module (130) is arranged on a side wall of the detection section (112).

8. The fluid measuring device according to claim 7, characterized in that: The fluid measuring device further comprises a stopper (140), the stopper (140) being accommodated in at least one of the liquid inlet section (111) and the liquid outlet section (113), the stopper (140) being used to limit the float (120) to be movable within the detection section (112).

9. The fluid measuring device according to claim 8, characterized in that: The stopper (140) has a conical structure, and the cross-sectional area of ​​one end of the stopper (140) close to the float (120) is smaller than the cross-sectional area of ​​the other end.

10. A fluid delivery system, characterized in that: A fluid measuring device comprising any one of claims 1-9.

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