A real-time detection device and method for liquid capacity of medical plastic bags

Abstract

The present invention discloses a real-time detection device and method for the liquid capacity of a medical plastic bag, which relates to the technical field of medical care appliances and solves the technical problem that the existing technology uses manual observation when observing the remaining liquid amount in a plastic bag container, and cannot automatically identify and transmit. The device includes a plastic bag and an intelligent detection buckle; a connecting electrode is provided on the plastic bag; the connecting electrode is fixedly connected to the outside of the plastic bag and electrically connected to the intelligent detection buckle; the intelligent detection buckle can sense the signal on the connecting electrode, and decode and output the signal. The present invention collects the liquid level height signal through the connecting electrode and the connecting electrode in the intelligent detection buckle, and then the intelligent detection buckle decodes the signal, sends the processed signal to the display terminal, and displays it on the display terminal, thereby realizing automatic data collection and presentation, saving time, and reducing labor consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of medical care appliances, and in particular to a device and method for real-time detection of liquid capacity in a medical plastic bag. Background Art

[0002] In the field of medical care equipment, traditional medical plastic bags, including infusion bags, drainage bags, and urinary catheterization bags, are consumed in large quantities. During use, medical staff need to constantly check the amount of liquid in the plastic bag. On the one hand, they decide whether to replace the plastic bag, such as whether the infusion bag is empty; on the other hand, they assist in judging the patient's condition, such as using a drainage bag to drain the accumulated fluid in postoperative patients.

[0003] Quantitative determination of the amount of liquid in a plastic bag primarily relies on the graduated lines printed on the bag. Due to various process engineering limitations, the minimum resolution and accuracy of these graduated lines are limited. In some cases, medical personnel must pour the liquid into a graduated cylinder to obtain an accurate reading, which is inconvenient and poses health and safety risks.

[0004] Traditional plastic bag containers require manual observation of the markings on the bags to identify the amount of liquid, which consumes a lot of manpower and has problems such as low accuracy and inability to automatically identify and transmit. Summary of the Invention

[0005] The purpose of the present invention is to provide a real-time detection device and method for the liquid capacity of a medical plastic bag, so as to solve the technical problems existing in the prior art of observing the remaining liquid amount in a traditional plastic bag container, which consumes a lot of manpower and cannot be automatically identified and transmitted.

[0006] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] The present invention provides a real-time detection device for the liquid capacity of a medical plastic bag, comprising a plastic bag and an intelligent detection buckle; the plastic bag is provided with a connecting electrode; the connecting electrode is fixedly connected to the outside of the plastic bag and electrically connected to the intelligent detection buckle; the intelligent detection buckle can sense the signal on the connecting electrode, decode the signal and output it.

[0009] Preferably, the plastic bag is provided with a pair of connecting electrodes; the connecting electrodes are both fixedly connected to the smart detection buckle.

[0010] Preferably, the smart detection buckle includes a probe-type electrode and a locking structure; the plastic bag is fixedly connected to the locking structure; the locking structure can lock the smart detection buckle on the plastic bag after the probe-type electrode contacts the connecting electrode.

[0011] Preferably, the smart detection buckle further includes an unlocking structure; the unlocking structure can unlock the locking structure.

[0012] Preferably, the intelligent detection buckle also includes an electrical signal detection module; the electrical signal detection module includes an electrode unit, an analog-to-digital sampling conversion unit, an AC parameter calculation and analysis unit, a radio transmission unit and a main control unit; the electrode unit, the analog-to-digital sampling conversion unit, the AC parameter calculation and analysis unit, and the radio transmission unit are connected in sequence; the electrode unit, the analog-to-digital sampling conversion unit, the AC parameter calculation and analysis unit, and the radio transmission unit are all connected to the main control unit.

[0013] Preferably, the real-time detection device further includes a display terminal; the display terminal is capable of displaying the signal after the intelligent detection deduction decoding.

[0014] In addition, the present invention also provides a real-time detection method for the liquid capacity of a medical plastic bag, which uses any of the above-mentioned real-time detection devices for the liquid capacity of a medical plastic bag to perform real-time detection of the liquid capacity of the medical plastic bag, wherein the intelligent detection buckle includes an electrical signal detection module; the real-time detection device includes a display terminal; and the real-time detection method includes the following steps:

[0015] S100, the probe electrode on the intelligent detection buckle is connected to the connection electrode, and senses the liquid level signal of the plastic bag in real time;

[0016] S200, the electrical signal detection module decodes the liquid level signal into a liquid capacity parameter;

[0017] S300: The electrical signal detection module outputs the liquid capacity parameter and displays it on the display terminal.

[0018] The intelligent detection button includes an electrical signal detection module; the real-time detection method includes the following steps:

[0019] S100: The probe electrode on the intelligent detection buckle is electrically connected to the connection electrode, and senses the liquid level signal of the plastic bag in real time;

[0020] S200, the electrical signal detection module decodes the liquid level signal into a liquid capacity parameter;

[0021] S300, the real-time detection device includes a display terminal; the electrical signal detection module outputs the liquid capacity parameter and displays it on the display terminal.

[0022] Preferably, the specific steps of S200 are:

[0023] The electrical signal detection module includes an electrode unit, an analog-to-digital sampling conversion unit, an AC parameter calculation and analysis unit, and a radio transmission unit;

[0024] S210, the electrode unit senses the liquid level signal on the connecting electrode;

[0025] S220, the analog-to-digital sampling conversion unit converts the liquid level signal into a digital signal;

[0026] S230: The AC parameter calculation and analysis unit pre-stores a mapping relationship between the liquid level height and the liquid capacity;

[0027] S240, converting the liquid level signal into a liquid capacity parameter;

[0028] S250: The radio transmission unit sends the liquid capacity parameter.

[0029] Implementing one of the above technical solutions of the present invention has the following advantages or beneficial effects:

[0030] The present invention collects the liquid level signal of the liquid in the plastic bag by connecting electrodes and an intelligent detection buckle, then decodes the signal in the intelligent detection buckle, sends the processed signal to the display terminal, and displays it on the display terminal, thereby realizing the observation of the liquid capacity in the plastic bag, realizing automatic data collection and presentation, saving time, and reducing labor consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work. In the drawings:

[0032] Figure 1 This is a schematic structural diagram of a plastic bag in accordance with an embodiment of the device for real-time detection of liquid capacity in a medical plastic bag of the present invention;

[0033] Figure 2 This is a first-view schematic diagram of an intelligent detection buckle of an embodiment of a real-time detection device for liquid capacity of a medical plastic bag according to the present invention;

[0034] Figure 3 2. This is a schematic diagram from a second perspective of the intelligent detection buckle of an embodiment of the device for real-time detection of liquid capacity in a medical plastic bag according to the present invention;

[0035] Figure 4 This is a schematic structural diagram of the electrical signal detection module of the intelligent detection buckle of the embodiment of the real-time detection device for liquid capacity of a medical plastic bag of the present invention;

[0036] Figure 5 This is a flow chart of an embodiment of a method for real-time detection of liquid capacity in a medical plastic bag according to the present invention;

[0037] Figure 6 This is a flow chart of signal decoding in the intelligent detection buckle of an embodiment of the real-time detection method for liquid capacity of a medical plastic bag of the present invention.

[0038] In the figure: 1. Plastic bag; 11. Connecting electrode; 12. Connecting structure; 13. Drain port; 2. Intelligent detection buckle; 21. Probe electrode; 22. Locking structure; 23. Locking hole; 24. Unlocking structure; 3. Electrical signal detection module; 31. Electrode unit; 32. Analog-to-digital sampling and conversion unit; 33. AC parameter calculation and analysis unit; 34. Radio transmission unit; 35. Main control unit. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present invention clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, in which various exemplary embodiments that may be used to implement the present invention are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods and devices that are consistent with some aspects of the present disclosure as detailed in the appended claims, and other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", etc. indicate the orientation or position relationship based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, be constructed and operate in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0041] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below, in which only the parts related to the embodiment of the present invention are shown.

[0042] Example 1:

[0043] like Figure 1-3 As shown, the present invention provides a real-time detection device for the liquid capacity of a medical plastic bag, comprising a plastic bag 1 and an intelligent detection buckle 2; the plastic bag 1 is provided with a connecting electrode 11, which is arranged on the outside of the plastic bag 1 and fixedly connected to the plastic bag 1; the intelligent detection buckle 2 is electrically connected to the connecting electrode 11 and can sense the signal on the connecting electrode 11, and the intelligent detection buckle 2 can decode and output the signal. Specifically, the plastic bag 1 is an infusion bag, a drainage bag, or a urinary catheterization bag. In addition, the connecting electrode 11 is a strip of conductive material and is arranged on the outside of the plastic bag 1. The material of the connecting electrode 11 includes but is not limited to metal, graphite carbon, conductive rubber, etc., and the material can be attached to the outside of the plastic bag 1 by means of pasting, printing, spraying, printing or electroplating. In the present invention, the number of connecting electrodes 11 is preferably a pair. Providing a pair of connecting electrodes 11 can reduce the error in detecting the liquid level. The connection electrodes 11 detect the liquid level by sensing the electric field in the liquid. The dielectric constant of the liquid is greater than that of the plastic bag, allowing the electrodes to sense the electric field in the liquid. The relationship between the change in the field strength of the liquid and the liquid level is used to detect the volume of the liquid in the plastic bag 1. A pair of connection electrodes 11 can be set on the same side of the plastic bag 1 or on both sides of the plastic bag 1. When set on the same side, the two connection electrodes 11 are set side by side; when set on both sides of the plastic bag 1, the two connection electrodes 11 are symmetrically set on different sides of the plastic bag 1. Depending on the position of the connection electrodes 11 on the plastic bag 1, the position of the probe electrode 21 on the smart detection buckle 2 will also change accordingly. The setting position of the probe electrode 21 must correspond to the setting position of the connection electrode 11 to achieve signal transmission while reducing errors. The plastic bag 1 can be hung or attached to the intelligent detection buckle 2, so that the connecting electrodes 11 on the plastic bag 1 come into one-to-one contact with the probe electrodes 21 on the intelligent detection buckle 2 (the number of probe electrodes 21 is the same as the number of connecting electrodes 11). After contact, the probe electrodes 21 can sense the liquid level signal from the connecting electrodes 11. The present invention collects the liquid level signal in the plastic bag 1 through the connecting electrodes 11 and the intelligent detection buckle 2. The intelligent detection buckle 2 processes the signal and transmits the processed signal to a display terminal for display. This allows the liquid volume in the plastic bag 1 to be observed, achieving automatic data collection and presentation, saving time and reducing labor consumption.

[0044] As an optional implementation, Figure 1-2As shown, the plastic bag 1 is provided with a connecting structure 12; the connecting structure 12 is provided in the middle lower part of the connecting electrode 11, and the plastic bag 1 is connected to the smart detection buckle 2 through the connecting structure 12. Specifically, the connecting structure 12 on the plastic bag 1 can be a connecting hole (of course, it can also be the positive or negative pole of a magnet); the locking structure 22 is a connecting column (of course, it can also be the negative or positive pole of a magnet); when the connecting structure 12 is a connecting hole and the locking structure 22 is a connecting column, the two are interference fit or snap-connected, and can be combined or separated through the unlocking structure 24. When the unlocking structure 24 is combined, the connecting electrode 11 on the plastic bag 1 is in reliable contact with the probe-type electrode 21 on the smart detection buckle 2, which is conducive to signal transmission. Specifically, the pair of connecting electrodes 11 in the present invention are strip electrodes. The arrangement of the connecting electrodes 11 is perpendicular to the surface of the liquid when the plastic bag 1 is working, so as to obtain the maximum detection sensitivity. The length of the connecting electrode 11 covers the liquid level that can be reached by the maximum capacity of the liquid in the plastic bag 1 when in use. Connecting structure 12 is positioned beneath plastic bag 1 and between the pair of connecting electrodes 11, facilitating securement with locking structure 22 and contact with intelligent detection buckle 2. This improves the sensitivity of connecting electrodes 11 during detection and reduces errors in liquid level detection. Therefore, the probe-type electrode 21 in the intelligent detection buckle 2, connected to connecting structure 12, ensures reliable contact with connecting electrodes 11 on the plastic bag 1, ensuring high-precision signal acquisition.

[0045] As an optional embodiment, the plastic bag 1 is also provided with a drain port 13; the liquid in the plastic bag 1 is discharged outwardly through the drain port 13 (of course, there are also plastic bags without a drain port). Specifically, the drain port 13 is provided at the middle bottom of the plastic bag 1 to discharge the liquid in the plastic bag 1 outwardly. When the plastic bag 1 used is an infusion bag, the liquid in the infusion bag is discharged from the drain port 13, and the connecting electrode 11 performs real-time detection of the remaining liquid amount in the infusion bag; if the plastic bag 1 used is a urinary catheterization bag, the connecting electrode 11 performs real-time detection of the increased amount of liquid in the urinary catheterization bag. When the amount of liquid in the urinary catheterization bag reaches the point where the liquid in the urinary catheterization bag needs to be discharged, the liquid will be discharged from the drain port 13. The usage time of the drain port 13 varies depending on the plastic bag 1 used. The drain port 13 is set at the middle bottom of the plastic bag 1 and can be shaped as a long tube. This setting facilitates the discharge of the liquid inside the plastic bag 1. When the plastic bag 1 is placed in the smart detection buckle 2, it does not affect the normal contact between the connecting electrode 11 and the probe-type electrode 21.

[0046] like Figure 1-3As shown, the smart detection buckle 2 includes a probe electrode 21 and a locking structure 22; the plastic bag 1 can be fixedly connected to the locking structure 22; the locking structure 22 can be locked after the probe electrode 21 contacts the connecting electrode 11. The smart detection buckle 2 is also provided with an unlocking structure 24; the unlocking structure 24 can unlock the locking structure 22. Specifically, the locking structure 22 can be connected to the locking hole 23, and the plastic bag 1 can be fixed to the locking structure 22 via the connecting structure 12. The locking structure 22 is configured as a cylinder, and the diameter of the head of the locking structure 22 is larger than the diameter of the cylinder body to prevent the plastic bag 1 from slipping on the locking structure 22; the head of the locking structure 22 engages with the locking hole 23 to secure the plastic bag 1. After the locking structure 22 secures the plastic bag 1, the probe electrode 21 on the plastic bag 1 reliably contacts the connecting electrode 11, and signal transmission is carried out after contact. When the plastic bag 1 is replaced or removed, it can only be unlocked by the unlocking structure 24, avoiding accidentally touching the unlocking structure 24, which may cause the probe electrode 21 to lose contact with the connecting electrode 11 and affect the detection quality.

[0047] like Figure 4 As shown, the intelligent detection buckle 2 also includes an electrical signal detection module 3; the electrical signal detection module 3 includes an electrode unit 31, an analog-to-digital sampling conversion unit 32, an AC parameter calculation and analysis unit 33, a radio transmission unit 34, and a main control unit 35; the electrode unit 31, the analog-to-digital sampling conversion unit 32, the AC parameter calculation and analysis unit 33, and the radio transmission unit 34 are connected in sequence; the electrode unit 31, the analog-to-digital sampling conversion unit 32, the AC parameter calculation and analysis unit 33, and the radio transmission unit 34 are all connected to the main control unit 35. Specifically, the signal transmitted by the connection electrode 11 is the liquid level signal, and the signal output by the intelligent detection buckle 2 is the liquid capacity parameter. The electrode unit 31 can detect the electric field signal of the liquid in the plastic bag 1 (the electric field signal has a corresponding functional relationship with the liquid level) by connecting to the electrode 11, and transmit the electric field signal to the analog-to-digital sampling and conversion unit 32; the analog-to-digital sampling and conversion unit 32 is used to convert the detected electric field signal into a digital signal; the AC parameter calculation and analysis unit 33 is used to calculate and analyze the digital signal to obtain the AC characteristic parameters of the analog response signal of the electrode unit 31, and transmit the AC characteristic parameters to the radio transmission unit 34; the radio transmission unit 34 is used to output the received AC characteristic parameters; the overall control unit is used to control and coordinate the electrode unit 31, the analog-to-digital sampling and conversion unit 32, the AC parameter calculation and analysis unit 33, and the radio transmission unit 34.

[0048] As an optional embodiment, the real-time detection device also includes a display terminal; the display terminal displays the signal decoded by the electrical signal detection module 3. Specifically, the probe-type electrode 21 of the receiving intelligent detection buckle 2 can obtain the liquid level height signal sensed by the connection electrode 11. A mapping relationship between liquid height and liquid capacity is pre-set within the electrical signal detection module 3. After receiving the liquid level height signal, the electrical signal detection module 3 will decode the liquid level height signal, convert the signal into a liquid capacity parameter based on the mapping relationship, and send the liquid capacity parameter to the display terminal for real-time display, allowing medical staff to observe the liquid capacity in the plastic bag 1 in real time and realize automatic identification of the liquid capacity.

[0049] As an optional embodiment, the display terminal is a display screen or a handheld device. Specifically, the display terminal displays the liquid volume parameter emitted by the electrical signal detection module 3. The display terminal can be a display screen, which is placed where medical staff can see it, and monitors the liquid volume data in real time. The display terminal can also be a handheld device, such as a mobile phone or other device. When medical staff leave, the liquid volume data can be pushed to relevant medical staff via the mobile phone, allowing them to monitor the liquid volume data in real time, reducing labor consumption.

[0050] The embodiment is only a special example and does not represent only one way of implementing the present invention.

[0051] Example 2:

[0052] like Figure 5 As shown, a real-time detection method for the liquid capacity of a medical plastic bag is provided. The real-time detection device for the liquid capacity of a medical plastic bag described in Example 1 is used to perform real-time detection of the liquid capacity of the medical plastic bag. The intelligent detection buckle includes an electrical signal detection module; the real-time detection device includes a display terminal; and the real-time detection method includes the following steps: S100, the probe electrode on the intelligent detection buckle is connected to the connection electrode, and the liquid level height signal of the plastic bag is sensed in real time; S200, the electrical signal detection module decodes the liquid level height signal into a liquid capacity parameter; S300, the electrical signal detection module outputs the liquid capacity parameter and displays it on the display terminal.

[0053] like Figure 6As shown, the specific steps of S200 are: the electrical signal detection module includes an electrode unit, an analog-to-digital sampling conversion unit, an AC parameter calculation and analysis unit, and a radio transmission unit; S210, the electrode unit senses the liquid level height signal on the connected electrode; S220, the analog-to-digital sampling conversion unit converts the liquid level height signal into a digital signal; S230, the mapping relationship between the liquid level and the liquid capacity is pre-stored in the AC parameter calculation and analysis unit; S240, the liquid level height signal is converted into a liquid capacity parameter; S250, the radio transmission unit sends the liquid capacity parameter.

[0054] It should be noted that the analog-to-digital sampling converter unit within the electrical signal detection module converts the collected electrical signals into digital signals. The AC parameter calculation and analysis unit within the electrical signal detection module pre-stores the mapping relationship between liquid level height and liquid volume. Upon receiving the liquid level height signal from the connection electrode, the AC parameter calculation and analysis unit directly converts the liquid level height signal into liquid volume parameters and transmits these liquid volume parameters to the display terminal for display. The combination of the connection electrode and the probe-type electrode enables automatic acquisition of the liquid level height. The display terminal can automatically present the data, enabling real-time monitoring of the liquid volume within the plastic bag, saving medical staff time and providing greater flexibility.

[0055] The foregoing is merely a preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of the present invention.

Claims

1. A real-time detection device for liquid capacity of medical plastic bags, characterized in that: The invention comprises a plastic bag (1) and an intelligent detection buckle (2); the plastic bag (1) is provided with a connection electrode (11); the connection electrode (11) is fixedly connected to the outside of the plastic bag (1) and is electrically connected to the intelligent detection buckle (2); the intelligent detection buckle (2) is capable of sensing a signal on the connection electrode (11), decoding the signal and outputting the signal; The plastic bag (1) is provided with a pair of connecting electrodes (11); the connecting electrodes (11) are both fixedly connected to the intelligent detection buckle (2).

2. A real-time detection device for liquid capacity of a medical plastic bag according to claim 1, characterized in that: The intelligent detection buckle (2) comprises a probe-type electrode (21) and a locking structure (22); the plastic bag (1) is fixedly connected to the locking structure (22); and the locking structure (22) is capable of locking the intelligent detection buckle (2) on the plastic bag (1) after the probe-type electrode (21) contacts the connection electrode (11).

3. The real-time detection device for liquid capacity of a medical plastic bag according to claim 2, characterized in that: The intelligent detection buckle (2) further comprises an unlocking structure (25); the unlocking structure (25) is capable of unlocking the locking structure (22).

4. The real-time detection device for liquid capacity of a medical plastic bag according to claim 1, characterized in that: The intelligent detection buckle (2) further comprises an electric signal detection module (3); the electric signal detection module (3) comprises an electrode unit (31), an analog-to-digital sampling conversion unit (32), an alternating current parameter calculation and analysis unit (33), a radio transmission unit (34), and a main control unit (35); the electrode unit (31), the analog-to-digital sampling conversion unit (32), the alternating current parameter calculation and analysis unit (33), and the radio transmission unit (34) are connected in sequence; the electrode unit (31), the analog-to-digital sampling conversion unit (32), the alternating current parameter calculation and analysis unit (33), and the radio transmission unit (34) are all connected to the main control unit (35).

5. The real-time detection device for liquid capacity of a medical plastic bag according to claim 1, characterized in that: The real-time detection device also includes a display terminal; the display terminal is capable of displaying the signal decoded by the intelligent detection button (2).

6. A method for real-time detection of liquid capacity in a medical plastic bag, comprising: using a real-time detection device for liquid capacity in a medical plastic bag according to any one of claims 1 to 5 to perform real-time detection of liquid capacity in a medical plastic bag, characterized in that: The intelligent detection button (2) includes an electric signal detection module (3); the real-time detection device includes a display terminal; and the real-time detection method includes the following steps: S100, the probe-type electrode (21) on the intelligent detection buckle (2) is connected to the connection electrode (11), and the liquid level height signal of the plastic bag (1) is sensed in real time; S200, the electrical signal detection module (3) decodes the liquid level signal into a liquid capacity parameter; S300: The electrical signal detection module (3) outputs the liquid capacity parameter and displays it on the display terminal.

7. A method for real-time detection of liquid capacity of a medical plastic bag according to claim 6, characterized in that: The specific steps of S200 are: The electric signal detection module (3) comprises an electrode unit (31), an analog-to-digital sampling conversion unit (32), an AC parameter calculation and analysis unit (33), and a radio transmission unit (34); S210, the electrode unit (31) senses the liquid level signal on the connecting electrode (11); S220, the analog-to-digital sampling conversion unit (32) converts the liquid level signal into a digital signal; S230, the AC parameter calculation and analysis unit (33) pre-stores a mapping relationship between the liquid level height and the liquid capacity; S240, converting the liquid level signal into a liquid capacity parameter; S250, the radio transmission unit (34) sends the liquid capacity parameter.

Images