Diaper / pants water wetting radio frequency sensor, disposable diaper / pants and mounting method

Abstract

The invention discloses a disposable diaper / trousers water-wet radio frequency sensor, a disposable diaper / trousers and an installation method in the technical field of radio frequency sensors. The disposable diaper / trousers water-wet radio frequency sensor comprises a radio frequency tag body layer, sodium chloride salt fine particles located at a resonant cavity position of a radio frequency tag, a tag water absorption layer and a moisture-proof protection film. The disposable diaper / trouser water-wet radio frequency sensor after the moisture-proof protective film is uncovered is located in the disposable diaper / trouser, and a label water absorption layer of the disposable diaper / trouser water-wet radio frequency sensor faces the inner side of the disposable diaper / trouser body; the method comprises the steps of uncovering the moisture-proof protective film, inserting one end of the disposable diaper / pants water-wet radio frequency sensor into a puncture needle front end hole, inserting a puncture needle into the inner side of the front end of the disposable diaper / pants body, pushing the puncture needle, pressing the tail end of the disposable diaper / pants water-wet radio frequency sensor to continue pushing, pulling out the puncture needle and the like. The disposable diaper / pants have the water wetting reminding function and are high in safety, low in cost and easy to apply and popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency sensors, and in particular to a diaper / pants water wetness radio frequency sensor and its application. Background Art

[0002] Diapers or diaper pants are widely used by bedridden elderly people or infants. If the diapers (pants) are wet and cannot be changed in time, the elderly or infants will be infected with bedsores. Nowadays, diapers or diaper pants are checked by people actively, which inevitably leads to untimely checks.

[0003] Therefore, there is an urgent need for a water sensor for diapers or diapers, which can notify medical staff or family members to change the diapers or diapers in time. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a diaper / pants water wetness radio frequency sensor and its application.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a diaper / pants water wetness radio frequency sensor, comprising a radio frequency tag body layer, sodium chloride salt fine particles, a tag water absorption layer and a moisture-proof protective film. The tag water absorption layer is a 0.1 mm to 0.3 mm thick water-absorbing paper, and the moisture-proof protective film is a 15 micron to 25 micron thick PP protective film.

[0007] The main layer of the RFID tag includes a PET base film, an RFID resonant cavity, an UHF antenna, an RFID chip and a pressure-sensitive adhesive layer. The RFID resonant cavity is located on the surface of the PET base film. The UHF antenna and the RFID chip are connected to the RFID resonant cavity to form an RFID resonant cavity assembly. The pressure-sensitive adhesive layer connects the PET base film and the label's water-absorbing layer.

[0008] The present invention also provides a diaper / pants, comprising a diaper / pants body, a diaper / pants water wetness radio frequency sensor after peeling off the moisture-proof protective film is located inside the diaper / pants, and the label water absorption layer of the diaper / pants water wetness radio frequency sensor faces the inner side of the diaper / pants body.

[0009] The present invention also provides a method for installing the above-mentioned diaper / pants water wetness radio frequency sensor, comprising the following steps:

[0010] S1. Remove the moisture-proof protective film on the surface of the wet radio frequency sensor of the diaper / pants;

[0011] S2, insert one end of the diaper / pants water wetness radio frequency sensor into the front end hole of the puncture needle;

[0012] S3, inserting a puncture needle into the inner side of the front end of the diaper / pants body, and after confirming that the water-absorbing layer of the label in the diaper / pants water-wet radio frequency sensor faces the inner side of the diaper / pants body, pushing the puncture needle forward, so that the diaper / pants water-wet radio frequency sensor synchronously moves forward and extends into the diaper / pants body;

[0013] S4, press the tail end of the diaper / pants water wetness RF sensor and continue to push the puncture needle forward until the front end of the diaper / pants water wetness RF sensor leaves the front end hole of the puncture needle;

[0014] S5. Pull out the puncture needle, so that the diaper / pants water wetness radio frequency sensor remains in the diaper / pants body.

[0015] After installation and wearing, the diaper / pants wet RF sensor is paired with the RFID alarm located under the bed. When the diaper / pants wet RF sensor is wet, the RFID alarm cannot receive signals, and the RFID alarm sends an alarm message to the sound and light display.

[0016] The present invention according to the above scheme has the beneficial effect that the present invention can enable the diaper / pants to realize the water reminder function so as to change the diaper / pants in time. The diaper / pants water radio frequency sensor of the present invention is hidden in the diaper / pants and does not directly contact the human body, making the wearing comfort of the diaper / pants better. In addition, the present invention adopts radio frequency technology instead of electrical signals to ensure the safety of the human body, and the signal acquisition is faster and the response is more sensitive.

[0017] The diaper / pants water wetness radio frequency sensor of the present invention can be installed more quickly and can be realized without changing the structure of the existing diapers / pants, so it is low in cost and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1a It is a schematic diagram of the structure of the diaper / pants water wetness radio frequency sensor with aluminum foil etched UHF antenna in the present invention;

[0019] Figure 1b It is a top view of the diaper / pants water wetness radio frequency sensor with an aluminum foil-etched UHF antenna in the present invention;

[0020] Figure 1c It is a schematic diagram of the radio frequency tag with ultra-high frequency antenna etched on aluminum foil in the present invention;

[0021] Figure 2a It is a schematic diagram of the structure of the diaper / pants water wetness radio frequency sensor with copper wire UHF antenna in the present invention;

[0022] Figure 2b It is a schematic diagram of the copper wire UHF antenna radio frequency tag of the present invention;

[0023] Figure 2c It is a schematic diagram of the structure of the double-loop radio frequency resonant cavity in the present invention;

[0024] Figure 3 It is a schematic diagram of the front end hole of the puncture needle in the present invention being inserted into the diaper / pants water wetness radio frequency sensor;

[0025] Figure 4 This is a schematic diagram of installing a diaper / pants water wetness radio frequency sensor by the puncture method of the present invention;

[0026] Figure 5 It is a schematic diagram of the application state of the diaper / pants water wetness radio frequency sensor in the present invention.

[0027] In the drawings, the reference numerals are:

[0028] 01. RF sensor for wetness of diapers / pants; 021. Water-permeable membrane of inner layer of diapers / pants; 022. Inside of diapers / pants; 023. Water-proof membrane of outer layer of diapers / pants; 03. Bedding; 04. RFID alarm;

[0029] 1. Sodium chloride salt fine particles; 2. Pressure-sensitive adhesive layer; 3. Label water-absorbing layer;

[0030] 11. Aluminum foil etched antenna PET base film; 12. Aluminum foil etched UHF antenna; 13. RF chip; 14. Moisture-proof protective film;

[0031] 21. PET base film for copper wire antenna; 22. UHF copper wire antenna; 23. Double-loop RF resonant cavity; 231. Inner circle aluminum foil; 232. Outer circle aluminum foil; 233. Chip coupling position; 234. Antenna coupling position;

[0032] 31. puncture needle; 32. tip of puncture needle; 33. front end hole of puncture needle. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0034] like Figures 1a to 2b As shown, the present invention provides a diaper / pants wet radio frequency sensor, which uses an ultra-high frequency radio frequency signal as a transmission signal to promptly remind people to change the diaper / pants after it is wet.

[0035] The diaper / pants water wetness radio frequency sensor includes a radio frequency tag body layer, sodium chloride salt fine particles 1, a tag water absorption layer 3 and a moisture-proof protective film 14. The radio frequency tag body layer provides basic radio frequency functions, the sodium chloride salt fine particles 1 are used to control radio frequency signals according to the water wetness conditions, the tag water absorption layer 3 is used to absorb water, and the moisture-proof protective film 14 can prevent the sodium chloride salt fine particles 2 from getting damp.

[0036] 1. RFID tag body layer

[0037] The main layer of the RFID tag is used to transmit and receive RFID signals. It is in the shape of a long strip as a whole. On the one hand, it can make the RFID tag small in size, and on the other hand, it can increase the transmission distance of the RFID signal and ensure signal sensitivity.

[0038] The RFID tag body includes a PET base film, an ultra-high frequency antenna, an RFID resonant cavity, an RFID chip 13, and a pressure-sensitive adhesive layer 2. The RFID resonant cavity is located on the surface of the PET base film, the ultra-high frequency antenna and the RFID chip 12 are connected to the RFID resonant cavity to form an RFID resonant cavity assembly, and the pressure-sensitive adhesive layer 2 is used to connect the PET base film and the label water-absorbing layer 3.

[0039] In the present invention, the UHF channel is located at 860MHz to 960MHz, and the UHF antenna can be an aluminum foil etched UHF antenna or a copper wire UHF antenna.

[0040] (1) Aluminum foil etching UHF antenna

[0041] like Figure 1a to Figure 1c As shown, the RF resonant cavity and the aluminum foil etched UHF antenna 12 are both formed by etching the aluminum foil of the PET base film. Specifically, an aluminum foil layer is provided on the surface of the aluminum foil etched antenna PET base film 11, and the aluminum foil layer is etched to form the RF resonant cavity and the aluminum foil etched UHF antenna 12. Figure 1c As shown, the RF resonant cavity is a ring loop with an opening, the RF chip 13 is connected to the chip coupling position of the ring loop, and one side of the ring loop opposite to the RF chip 13 extends left and right to form antenna wings (i.e., aluminum foil etched UHF antenna 12) to enhance the RF signal strength.

[0042] In this way, the pressure-sensitive adhesive layer 2 is located on the surface of the RF chip 12, which is connected to the aluminum foil etched antenna PET bottom film 11, and is used to surround the RF chip 13 and the aluminum foil etched UHF antenna 12 between the pressure-sensitive adhesive layer 2 and the aluminum foil etched antenna PET bottom film 11. The sodium chloride salt fine particles 1 are located between the pressure-sensitive adhesive layer 2 and the RF resonant cavity (aluminum foil etched UHF antenna 12), so that the pressure-sensitive adhesive layer 2 can be connected to the aluminum foil etched antenna PET bottom film 11 while the sodium chloride salt fine particles 1 can be sealed.

[0043] (2) Copper wire UHF antenna

[0044] like Figure 2a to Figure 2c As shown, the copper wire UHF antenna 22 is formed by bending a copper wire, and the copper wire is connected to the antenna coupling position 234 of the double-loop RF resonant cavity 23 to realize the function of transmitting data by the antenna. Specifically, the double-loop RF resonant cavity 12 and the copper wire UHF antenna 22 are bonded to the pressure-sensitive adhesive layer 2, and the sodium chloride salt fine particles 1 are located at the position of the double-loop RF resonant cavity 12.

[0045] In this way, the pressure-sensitive adhesive layer 2 is located at the lower side of the double-loop RF resonant cavity 23 and the copper wire UHF antenna 22, and the double-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1 can be bonded to their surface at the same time to achieve the fixation of the three. Another layer of pressure-sensitive adhesive layer is also provided on the upper side of the double-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1, and the label water-absorbing layer 3 is located on the surface of the double-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1 to achieve the connection of the several and the bonding of the label water-absorbing layer.

[0046] Preferably, the diameter of the copper wire is 0.05 mm to 0.08 mm, and the resistance of each meter of the copper wire is less than 7.5 ohms. The shape of the copper wire UHF antenna 22 is a straight line, a sine wave, a square wave, a triangle wave, a trapezoid, a tooth shape, or a mixed wave. A mixed wave refers to a shape formed by connecting any two or more of the above-mentioned shapes, such as a straight line, a sine wave, a straight line, and the like.

[0047] In this embodiment, the double-ring RF resonant cavity 23 includes an inner ring aluminum foil 231 and an outer ring aluminum foil 232 formed by etching aluminum foil. The openings of the inner ring aluminum foil 231 and the outer ring aluminum foil 232 are located at one place to form a chip coupling position 233 so as to be connected to the RF chip 13. The outer ring aluminum foil 232 on the side opposite to the installation position of the RF chip 13 is provided with an antenna coupling position 234 so that it can be coupled with the copper wire UHF antenna 22. At the same time, the packaging pins of the RF chip 13 include two packaging balancing pins and two packaging pins, and the two packaging balancing pins are connected by a short-circuit wire. One packaging balancing pin is connected to one end point of the inner ring aluminum foil 231, and the other packaging balancing pin is connected to one end point of the outer ring aluminum foil 232. One packaging pin is connected to the other end point of the inner ring aluminum foil 231, and the other packaging pin is connected to the other end point of the outer ring aluminum foil 232. The RF chip 13 is fixed to the end points of the double-loop RF resonant cavity 23 by conductive resin, and the inner circle aluminum foil and the outer circle aluminum foil are connected in series through the short circuit line between the packaging balance pins. The two packaging pins of the RF chip 13 and the inductor connected in series with the inner circle aluminum foil and the outer circle aluminum foil constitute a double-loop RF resonant cavity assembly.

[0048] 2. Sodium chloride salt fine particles

[0049] The sodium chloride salt fine particles 1 are arranged in the RFID tag body layer and located at the resonant cavity of the RFID tag, so that the state change of the sodium chloride salt fine particles 1 can directly affect the radio frequency performance of the radio frequency resonant cavity. In addition, the sodium chloride salt fine particles 1 are low in cost and will not cause damage to the human body.

[0050] 3. Label water absorption layer

[0051] The label water-absorbing layer 3 is located on the surface of the RFID label body layer, and is connected to the pressure-sensitive adhesive layer 2 of the RFID label body layer to achieve fixation, and also covers the sodium chloride salt fine particles 1. The sodium chloride salt fine particles 1 are in direct contact with the label water-absorbing layer 3, so that the sodium chloride salt fine particles 1 change state according to the water wetness of the label water-absorbing layer 3.

[0052] The water-absorbing layer 3 of the label of the present invention is made of absorbent paper with a thickness of 0.1 mm to 0.3 mm.

[0053] 4. Moisture-proof protective film

[0054] The moisture-proof protective film 14 is located on the surface of the label water-absorbing layer 3. When the diaper / pants water-wet radio frequency sensor is used, the moisture-proof protective film 14 needs to be torn off. The moisture-proof protective film 14 is a PP protective film with a thickness of 15 microns to 25 microns, which covers the surface of the label water-absorbing layer 3, so that when the weather is humid, the fine particles of sodium chloride salt are blocked from getting wet.

[0055] like Figure 3 As shown, the present invention also provides a diaper / pants using a diaper / pants water wetness radio frequency sensor, including a diaper / pants body, the inner side of the diaper / pants body is a diaper / pants inner layer water permeable membrane 021, and the outer side is a diaper / pants outer layer waterproof membrane 022.

[0056] After removing the moisture-proof protective film, the diaper / pants water-wet RF sensor is located inside the diaper / pants 022, and the label water-absorbent layer of the diaper / pants water-wet RF sensor faces the inner side of the diaper / pants body, so that the label water-absorbent layer can detect water as soon as possible to perform a radio frequency response.

[0057] After removing the moisture-proof protective film, the diaper / pants water wetness RF sensor is inserted into the interior of the diaper / pants body through the puncture needle 31. The front end of the puncture needle 31 is provided with a puncture needle tip 32, and the rear side of the puncture needle tip 32 is provided with a puncture needle front end hole 33. When installing, the diaper / pants water wetness RF sensor 01 is first passed through the puncture needle front end hole 33, and the puncture needle 31 is used to drive the diaper / pants water wetness RF sensor 01 to penetrate into the interior 022 of the diaper / pants.

[0058] like Figure 3 , Figure 4 As shown, the present invention also provides a method for installing a diaper / pants water wetness radio frequency sensor, comprising the following steps:

[0059] 1. Remove the moisture-proof protective film on the surface of the diaper / pants water-wet RF sensor 01.

[0060] 2. Use the puncture needle tip 32 to insert one end of the diaper / pants water wetness radio frequency sensor 01 into the puncture needle front end hole of the puncture needle.

[0061] 3. Insert the puncture needle 31 into the inner side of the front end of the diaper / pants body (the side of the inner water-permeable film 021 of the diaper / pants), and after confirming that the water-absorbing layer of the label in the diaper / pants water-wet RF sensor 01 is facing the inner side of the diaper / pants body, push the puncture needle 31 forward (according to the length of the diaper / pants water-wet RF sensor 01, the pushing distance is approximately 80 mm), so that the diaper / pants water-wet RF sensor 01 moves forward synchronously and extends into the diaper / pants body.

[0062] 4. Press the end of the diaper / pants water RF sensor 01 ( Figure 3 ), continue to push the puncture needle 31 forward (according to the length of the diaper / pants water wetness RF sensor 01 inserted into the front end hole 33 of the puncture needle, the pushing distance is approximately 20 mm to 30 mm) until the front end of the diaper / pants water wetness RF sensor 01 leaves the front end hole 33 of the puncture needle.

[0063] 5. Pull out the puncture needle 31, so that the diaper / pants water wetness radio frequency sensor 01 remains in the diaper / pants body.

[0064] After being installed and worn on the human body, the diaper / pants wet radio frequency sensor is paired with the radio frequency identification alarm 04 located under the bed 03. When the diaper / pants wet radio frequency sensor 01 is wet, the radio frequency identification alarm 04 cannot receive signals. The radio frequency identification alarm 04 sends an alarm message to the sound and light display, and the sound and light display in the hall or duty room gives a sound and light alarm to remind others to change the diapers / pants.

[0065] After installing the diaper / pants wetness RF sensor, you can also calibrate the sensor. The specific steps are as follows:

[0066] 1. Place the diaper / pants in the middle of the bed 03 so that it corresponds to the position of a person lying flat or lying on his side.

[0067] 2. Turn on the power of the RFID alarm 04, the green light of the RFID alarm 04 is on, indicating that it is working normally, and the RF signal of the diaper / pants wet RF sensor 01 can be read, indicating that the diaper / pants are not wet.

[0068] 3. Cover the diaper / pants wet RF sensor 01 with both hands to significantly reduce the sensitivity of its RF tag, or hold the diaper / pants and raise it more than 40 cm to make it difficult for the RF signal to be read by the RFID alarm 04, which means that the RF tag is invalid and the diaper / pants are wet. At this time, since the RFID alarm 04 cannot read the RF signal of the diaper / pants wet RF sensor 01, it generates an alarm signal.

[0069] If the alarm generates an alarm signal, it indicates that the diaper / pants water wetness radio frequency sensor 01 can work normally.

[0070] The working principle of the diaper / pants water wetness radio frequency sensor in the present invention is:

[0071] 1) The dielectric constant of the RF resonant cavity in the diaper / pants wet RF sensor determines the reading sensitivity of the RF tag. When sodium chloride salts are in a solid state, the dielectric constant is small. When they are in the RF resonant cavity, the solid sodium chloride salt has little effect on the reading sensitivity of the RF tag, and the RF tag can work normally; sodium chloride salts change from solid to liquid when in contact with water, and have conductive properties, and the dielectric constant increases significantly. When they are in the RF resonant cavity, the liquid sodium chloride salt causes the reading sensitivity of the RF tag to drop significantly, and the RF function is lost.

[0072] 2) Since the RFID tag function of the wet RFID sensor of the diaper / pants fails, the RFID reader (i.e., the RFID alarm located under the bed) cannot read the RFID signal, and its output changes from a low level to a high level, triggering an alarm signal; at the same time, it can also be linked with the sound and light display in the hall or duty room to make it sound and light alarm to remind people to change diapers / pants.

[0073] During normal use: when children, the elderly, or paralyzed patients wear diapers / pants, if the diapers / pants are wet, the water enters the RF resonant cavity through the water-absorbing layer of the tag, and the fine particles of sodium chloride are dissolved, which greatly increases the dielectric constant of the sodium chloride solution, greatly reduces the sensitivity of the RF tag and makes it invalid. There is no RF signal or the RF signal cannot be recognized by the RFID alarm 04, and then it outputs a high level to trigger an alarm signal.

[0074] The functional characteristics of the diaper / pants water wetness radio frequency sensor, i.e., the diaper / pants, in the present invention are as follows:

[0075] (1) The diaper / pants water wetness RF sensor is located inside the diaper / pants body and does not directly contact people, which is very comfortable.

[0076] (2) The diaper / pants wetness RF sensor does not require power supply, no wires to be laid, and no current to flow, so it is safe.

[0077] (3) The diaper / pants water wetness radio frequency sensor is more convenient and quick to install on the diaper / pants body.

[0078] (4) The RF sensor for wet diapers / pants has a fast response speed and can output an alarm signal within three minutes of being wetted.

[0079] (5) The diaper / pants water wetness radio frequency sensor is small in size, low in cost, and easy to be widely promoted and applied.

[0080] (6) There is no need to change the structure of the existing diapers / pants, and the diaper / pants water wetness radio frequency sensor can be directly installed into the diaper / pants.

Claims

1. A diaper / pants water wetness radio frequency sensor, characterized in that: include: The RFID tag body layer is used to transmit and receive RFID signals; Sodium chloride salt fine particles, which are arranged in the main layer of the radio frequency tag and located at the resonant cavity of the radio frequency tag; The label water-absorbing layer is located on the surface of the radio frequency label body layer. and a moisture-proof protective film, which is located on the surface of the water-absorbing layer of the label.

2. The diaper / pants water wetness radio frequency sensor according to claim 1, characterized in that: The RF tag body layer includes a PET base film, a RF resonant cavity, an ultra-high frequency antenna, a RF chip and a pressure-sensitive adhesive layer. The RF resonant cavity is located on the surface of the PET base film. The ultra-high frequency antenna and the RF chip are connected to the RF resonant cavity to form a RF resonant cavity assembly. The pressure-sensitive adhesive layer is used to connect the PET base film and the label water-absorbing layer.

3. The diaper / pants water wetness radio frequency sensor according to claim 2, characterized in that: An aluminum foil layer is provided on the surface of the PET base film, and the aluminum foil layer is etched to form the ultra-high frequency antenna and the radio frequency resonant cavity.

4. The diaper / pants water wetness radio frequency sensor according to claim 2, characterized in that: The ultra-high frequency antenna is formed by bending a copper wire, and the copper wire is adhered to the inner side of the pressure-sensitive adhesive layer and coupled to the antenna coupling position of the radio frequency resonant cavity.

5. The diaper / pants water wetness radio frequency sensor according to claim 1, characterized in that: The label water-absorbing layer is water-absorbing paper, and the thickness of the water-absorbing paper is 0.1 mm to 0.3 mm.

6. The diaper / pants water wetness radio frequency sensor according to claim 1, characterized in that: The thickness of the moisture-proof protective film is 15 microns to 25 microns.

7. A diaper / pants using the diaper / pants water wetness radio frequency sensor according to any one of claims 1 to 6, characterized in that: The diaper / pants body is included. After the moisture-proof protective film is peeled off, the diaper / pants water-wet radio frequency sensor is located inside the diaper / pants, and the label water-absorbing layer of the diaper / pants water-wet radio frequency sensor faces the inner side of the diaper / pants body.

8. The paper diaper / pants according to claim 7, characterized in that: After the moisture-proof protective film is peeled off, the diaper / pants water wetness radio frequency sensor is inserted into the interior of the diaper / pants body through a puncture needle.

9. A method for installing a diaper / pants water wetness radio frequency sensor according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Remove the moisture-proof protective film on the surface of the wet radio frequency sensor of the diaper / pants; S2, inserting one end of the diaper / pants water wetness radio frequency sensor into the front end hole of the puncture needle; S3, inserting a puncture needle into the inner side of the front end of the diaper / pants body, and after confirming that the water-absorbing layer of the label in the diaper / pants water-wet radio frequency sensor faces the inner side of the diaper / pants body, pushing the puncture needle forward, so that the diaper / pants water-wet radio frequency sensor moves forward synchronously and extends into the diaper / pants body; S4, pressing the tail end of the diaper / pants water wetness RF sensor, and continuing to push the puncture needle forward until the front end of the diaper / pants water wetness RF sensor leaves the front end hole of the puncture needle; S5. Pull out the puncture needle so that the diaper / pants water wetness radio frequency sensor remains in the diaper / pants body.

10. The method for installing a diaper / pants water wetness radio frequency sensor according to claim 9, characterized in that: After being installed and worn on the human body, the diaper / pants wet radio frequency sensor is paired with a radio frequency identification alarm located under the bed. When the diaper / pants wet radio frequency sensor is wet, the radio frequency identification alarm cannot receive signals, and the radio frequency identification alarm sends alarm information to the sound and light display.

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