Wireless systems, gas management systems, alarm-side wireless devices, and meter-side wireless devices

Abstract

To provide a wireless system, a gas control system, an alarm unit-side wireless device, and a meter-side wireless device that can suppress an electric power consumption related to connection calling while preventing alarm unit information on a gas alarm unit in a wireless connection state from being deleted on a gas meter side.SOLUTION: A wireless system WS comprises: alarm unit-side wireless devices 20 connected externally to gas alarm unit 10, respectively; and a meter-side wireless device 30 connected externally to a gas meter 40. The wireless system WS transmits and receives information wirelessly between the alarm unit-side wireless device 20 and meter-side wireless device 30. The alarm unit-side wireless device 20 does not transmit a connection call indicative of a wireless connection state to the meter-side wireless device 30, but transmits a deletion request denying the wireless connection state to the meter-side wireless device 30 when a predetermined deletion event occurs, and the meter-side wireless device 30 makes a connection call to the gas meter 40 at predetermined timing without receiving the connection call until the deletion request is received from the alarm unit-side wireless device 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wireless system, a gas management system, an alarm-side wireless device, and a meter-side wireless device. [Background Art]

[0002] Conventionally, gas management systems in which a gas alarm and a gas meter are connected wirelessly have been proposed (see, for example, Patent Document 1). This system comprises a gas alarm, an alarm-side wireless device externally connected to the gas alarm, a meter-side wireless device externally connected to the gas meter, and the gas meter. For example, the gas alarm transmits a notification that a gas leak has been detected to the gas meter via both wireless devices, and the gas meter closes the shut-off valve, whereby safety can be improved. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2010-277503 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In the gas management system described in Patent Document 1, for example, the gas meter stores alarm information (e.g., ID) of the wirelessly connected gas alarm in its own table (i.e., a storage unit). When a new gas alarm is connected wirelessly, the alarm information transmitted from the gas alarm is newly registered in the table. Further, the gas alarm, for example, periodically issues a connection call to notify the gas meter that it is in a wirelessly connected state. The connection call reaches the gas meter via both wireless devices. If the connection call does not arrive for a predetermined period of time, the gas meter determines that the wireless connection is no longer established, such as when the gas alarm has been removed, and deletes the corresponding alarm information from the table.

[0005] In this case, if the gas alarm and gas meter are connected by a wire, power consumption will not be very high even if connection calls are transmitted many times, such as periodically. However, if the gas alarm and gas meter are connected wirelessly, power consumption will increase if connection calls are made many times. This has led to the problem of increased costs, such as having to install many batteries in the wireless device on the alarm side. On the other hand, if measures such as not making connection calls are taken, the alarm information will be deleted from the table in the gas meter, and the gas meter will not be able to recognize gas alarms that are wirelessly connected, which is also a problem.

[0006] The present invention was made to solve the above-mentioned conventional problems, and its objective is to provide a wireless system, a gas management system, a wireless device on the alarm side, and a wireless device on the meter side that can suppress power consumption related to connection calls while preventing the deletion of alarm information of a wirelessly connected gas alarm on the gas meter side. [Means for solving the problem]

[0007] The present invention provides a wireless system comprising: an alarm-side wireless device built into or externally connected to a gas alarm; and a meter-side wireless device built into or externally connected to a gas meter, which is capable of storing alarm information of a gas alarm that is in a wireless connection state and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that it is in a wireless connection state with the gas alarm, and the wireless system transmits and receives information wirelessly between the alarm-side wireless device and the meter-side wireless device, wherein the alarm-side wireless device does not transmit the connection call to the meter-side wireless device, but transmits a deletion request to the meter-side wireless device that denies the wireless connection state when a predetermined deletion event occurs, and the meter-side wireless device makes the connection call to the gas meter at a predetermined timing even if it does not receive the connection call from the alarm-side wireless device until it receives the deletion request from the alarm-side wireless device.

[0008] The gas management system of the present invention comprises a gas alarm, an alarm-side wireless device built into or externally connected to the gas alarm, a gas meter capable of storing alarm information of the gas alarm in a wireless connection state and deleting the alarm information of the gas alarm when it cannot receive a connection call indicating that it is wirelessly connected to the gas alarm, and a meter-side wireless device built into or externally connected to the gas meter, wherein the gas management system transmits and receives information wirelessly between the alarm-side wireless device and the meter-side wireless device, wherein the alarm-side wireless device does not transmit the connection call to the meter-side wireless device, but transmits a deletion request to the meter-side wireless device that denies the wireless connection state when a predetermined deletion event occurs, and the meter-side wireless device makes the connection call to the gas meter at a predetermined timing even if it does not receive the connection call from the alarm-side wireless device, until it receives the deletion request from the alarm-side wireless device.

[0009] The alarm-side wireless device of the present invention is capable of storing alarm information of a gas alarm that is in a wireless connection state, and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that it is in a wireless connection state with the gas alarm. It transmits and receives information wirelessly with a meter-side wireless device which is built into or externally connected to the gas meter, and the alarm-side wireless device which is built into or externally connected to the gas alarm does not transmit the connection call to the meter-side wireless device, but transmits a deletion request which denies the wireless connection state when a predetermined deletion event occurs to the meter-side wireless device.

[0010] The meter-side wireless device of the present invention is capable of storing alarm information of a gas alarm that is in a wireless connection state, and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that the gas alarm and itself are in a wireless connection state. The meter-side wireless device is built into or externally connected to a gas meter and transmits and receives information wirelessly with an alarm-side wireless device built into or externally connected to a gas alarm, and until it receives a deletion request from the alarm-side wireless device that denies that the gas alarm and the gas meter are in a wireless connection state, it will make the connection call to the gas meter at a predetermined timing even if it does not receive a connection call indicating that the gas alarm and the gas meter are in a wireless connection state from the alarm-side wireless device. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a wireless system, a gas management system, a wireless alarm device on the alarm side, and a wireless meter side that can suppress power consumption related to connection calls while preventing the deletion of alarm information of a wirelessly connected gas alarm on the gas meter side. [Brief explanation of the drawing]

[0012] [Figure 1] This is a configuration diagram of a gas management system according to an embodiment of the present invention. [Figure 2] Figure 1 is a block diagram showing the configuration of the gas alarm and the wireless device on the alarm side. [Figure 3] Figure 1 is a block diagram showing the configuration of the meter-side wireless device and the gas meter. [Figure 4] This is a first configuration diagram showing an overview of the control method for the gas management system according to this embodiment. [Figure 5] This is a second configuration diagram showing an overview of the control method for the gas management system according to this embodiment. [Figure 6] This is a third configuration diagram showing an overview of the control method for the gas management system according to this embodiment. [Figure 7] This is the fourth configuration diagram, which shows an overview of the control method for the gas management system according to this embodiment. [Figure 8]It is a flowchart showing the control method for the gas alarm device illustrated in Fig. 2. [Figure 9] It is a flowchart showing the control method for the alarm-side wireless device illustrated in Fig. 2. [Figure 10] It is a flowchart showing the control method for the meter-side wireless device illustrated in Fig. 3. [Figure 11] It is a flowchart showing the control method for the gas meter illustrated in Fig. 3. [Figure 12] It is a second flowchart showing the control method for the meter-side wireless device illustrated in Fig. 3. [Figure 13] It is a configuration diagram of the gas management system according to the second embodiment. [Figure 14] It is a block diagram showing the configuration of the gas alarm device illustrated in Fig. 13. [Figure 15] It is a block diagram showing the configuration of the gas meter illustrated in Fig. 13. MODE FOR CARRYING OUT THE INVENTION

[0013] The present invention will be described below with reference to preferred embodiments. The present invention is not limited to the embodiments described below, and can be appropriately modified without departing from the scope of the spirit of the present invention. Furthermore, in the embodiments described below, illustration and description of a part of the configuration are omitted in some places, but it goes without saying that publicly known or well-known techniques are appropriately applied to the details of the omitted techniques within a range that does not conflict with the content described below.

[0014] FIG. 1 is a configuration diagram of a gas management system according to an embodiment of the present invention. A gas management system 1 shown in FIG. 1 includes a plurality of gas alarms 10, a wireless system WS, and a gas meter 40. The wireless system WS is configured to include a plurality of alarm-side wireless devices 20 and a meter-side wireless device 30. In the example shown in FIG. 1, the plurality of gas alarms 10 and the gas meter 40 are in a wireless connection state via the plurality of alarm-side wireless devices 20 and the meter-side wireless device 30. For this reason, storage units 36 and 45 of the meter-side wireless device 30 and the gas meter 40, which will be described later, store respective IDs (an example of alarm information) of the plurality of alarm-side wireless devices 20 that are in a wireless connection state.

[0015] Each of the plurality of gas alarms 10 issues an alarm when a gas leak occurs in a monitoring area. Each of the plurality of alarm-side wireless devices 20 is wired-connected (an example of external connection) to an individual gas alarm 10, and transmits and receives information to and from the meter-side wireless device 30 by wireless. The gas meter 40 integrates and displays the flow rate of fuel gas supplied to a consumer side. The meter-side wireless device 30 is wired-connected (an example of external connection) to the gas meter 40, and transmits and receives information to and from each of the plurality of alarm-side wireless devices 20 by wireless.

[0016] In such a gas management system 1, transmission and reception of information is performed between the plurality of gas alarms 10 and the gas meter 40 via the wireless system WS (relaying the plurality of alarm-side wireless devices 20 and the meter-side wireless device 30). For example, when a gas leak is detected in a specific gas alarm 10a, the specific gas alarm 10a transmits the notification to the gas meter 40 through the specific alarm-side wireless device 20a and the meter-side wireless device 30 that are wired-connected. Accordingly, the gas meter 40 can close, for example, a shutoff valve (not shown). Further, when the shutoff valve is closed or opened, the gas meter 40 transmits the notification to the plurality of gas alarms 10 through the plurality of alarm-side wireless devices 20 and the meter-side wireless device 30. Accordingly, the plurality of gas alarms 10 can notify, for example, that the shutoff valve has been closed or opened.

[0017] Figure 2 is a block diagram showing the configuration of the gas alarm 10 and the alarm-side wireless device 20 shown in Figure 1. Each of the multiple gas alarms 10 is equipped with a gas sensor 11, a control unit 12, a notification unit 13, a communication unit 14, a timer 15, and a storage unit 16, as shown in Figure 2.

[0018] The gas sensor 11 outputs a signal corresponding to the concentration of the target gas in the monitoring area. The control unit 12 controls the entire gas alarm 10 and determines whether the target gas has reached an abnormal concentration based on the signal from the gas sensor 11. The notification unit 13 is composed of a speaker capable of outputting sound and notifies, for example, when the target gas has reached an abnormal concentration. Furthermore, the notification unit 13 also notifies when it receives a valve closing signal from the shut-off valve of the gas meter 40.

[0019] The communication unit 14 communicates with the alarm-side wireless device 20 via a wired connection. This communication unit 14 is equipped with a connection call transmission unit 14a. The connection call transmission unit 14a transmits a connection call to the alarm-side wireless device 20, which is connected via a wired connection, indicating that it is wirelessly connected to the gas meter 40. This connection call transmission unit 14a transmits the connection call to the alarm-side wireless device 20 at predetermined intervals. In the following explanation, it is assumed that the connection call is transmitted at predetermined intervals, such as every 10 minutes.

[0020] Timer 15 is a timing function unit, used, for example, to measure a predetermined time when a connection call is transmitted at predetermined intervals. Note that Timer 15 is used not only for timing connection calls but also for timing other functions.

[0021] The memory unit 16 stores programs for controlling the gas alarm 10. In particular, the memory unit 16 in this embodiment stores an ID for identifying itself from among a large number of gas alarms 10. This ID consists of, for example, a number of more than ten digits, and is a different value for each gas alarm 10. The ID is stored in advance when the gas alarm 10 is shipped. In particular, since the ID is assigned a value to identify the manufacturer of the gas alarm 10, it prevents the ID from being duplicated between manufacturers.

[0022] Furthermore, the control unit 12 is equipped with an abnormal state detection unit 12a. The abnormal state detection unit 12a detects abnormal conditions that cause the gas alarm 10 to cease functioning normally. For example, the abnormal state detection unit 12a detects a malfunction of the gas sensor 11 or the like. Also, if the gas alarm 10 is plugged into an outlet, the abnormal state detection unit 12a detects a power plug disconnection. Similarly, if the gas alarm 10 is battery-powered, the abnormal state detection unit 12a detects a drop in battery voltage. In this way, the abnormal state detection unit 12a detects abnormal conditions in the gas alarm 10.

[0023] In addition, the communication unit 14 is equipped with an abnormal signal transmission unit 14b. The abnormal signal transmission unit 14b transmits an abnormal signal to the alarm-side wireless device 20 when an abnormal condition is detected by the abnormal condition detection unit 12a, such as a malfunction of the gas sensor 11, a disconnected power plug, or a drop in battery voltage.

[0024] Each of the multiple alarm-side wireless devices 20 includes a control unit 21, a first communication unit 22, a second communication unit 23, a timer 24, and a storage unit 25, as shown in Figure 2.

[0025] The first communication unit 22 communicates with the gas alarm 10 via a wired connection. In particular, in this embodiment, the first communication unit 22 receives connection calls transmitted from the connection call transmission unit 14a and abnormal signals transmitted from the abnormal signal transmission unit 14b.

[0026] The control unit 21 controls the entire alarm-side wireless device 20. This control unit 21 includes a deletion event determination unit 21a. The deletion event determination unit 21a determines whether an event (a predetermined deletion event) has occurred that should negate the wireless connection state with the gas meter 40.

[0027] In this embodiment, the deletion event determination unit 21a determines that a predetermined deletion event has occurred if no connection call is received from the gas alarm 10. More specifically, the timer 24 of the alarm-side wireless device 20 in this embodiment measures a predetermined time, similar to the timer 15 of the gas alarm 10. When a normal gas alarm 10 is connected to the alarm-side wireless device 20, one connection call should be transmitted while the timer 24 is measuring the predetermined time, and the first communication unit 22 should receive one connection call during the predetermined time. On the other hand, if the timer 24 fails to receive a connection call while measuring the predetermined time, it can be inferred that the gas alarm 10 and the alarm-side wireless device 20 have been disconnected, or that the gas alarm 10 is not functioning properly. The deletion event determination unit 21a determines that a predetermined deletion event has occurred if no connection calls are received even once while the predetermined time is being measured. In this embodiment, the deletion event determination unit 21a may determine that a predetermined deletion event has occurred if, from the viewpoint of improving accuracy, no connection calls are received for N consecutive times (where N is an integer of 2 or more) while a predetermined time is being measured.

[0028] Furthermore, in this embodiment, the deletion event determination unit 21a determines that a predetermined deletion event has occurred when it receives an abnormal signal from the gas alarm 10. As described above, the abnormal signal indicates that the gas alarm 10 is no longer functioning properly, such as due to a malfunction or the power plug being disconnected. Therefore, the deletion event determination unit 21a determines that a predetermined deletion event has occurred when it receives an abnormal signal.

[0029] The second communication unit 23 communicates wirelessly with the meter-side wireless device 30 (see Figure 1). This second communication unit 23 is equipped with a deletion request transmission unit 23a. When the deletion event determination unit 21a determines that a predetermined deletion event has occurred, the deletion request transmission unit 23a transmits a deletion request to the meter-side wireless device 30 to negate the wireless connection state. In addition, the storage unit 25 of the alarm-side wireless device 20 stores the ID of the gas alarm 10. When transmitting a deletion request, the deletion request transmission unit 23a also transmits the ID information.

[0030] As is clear from the above, the second communication unit 23 does not have a transmission unit for connection calls. In other words, the alarm-side wireless device 20 does not transmit connection calls to the meter-side wireless device 30. Therefore, connection calls are not transmitted wirelessly at predetermined intervals, and the power consumption of the alarm-side wireless device 20 is reduced.

[0031] Figure 3 is a block diagram showing the configuration of the meter-side wireless device 30 and gas meter 40 shown in Figure 1. As shown in Figure 3, the meter-side wireless device 30 includes a control unit 31, a first communication unit 32, a second communication unit 33, a first timer 34, a second timer 35, and a storage unit (storage means) 36.

[0032] The second communication unit 33 communicates wirelessly with the alarm-side wireless device 20 (see Figure 1). The second communication unit 33 receives a deletion request when it is transmitted from the alarm-side wireless device 20.

[0033] The control unit 31 controls the entire meter-side wireless device 30. This control unit 31 includes a deletion processing unit 31a. The deletion processing unit 31a executes a deletion process when it receives a deletion request from the alarm-side wireless device 20. Here, the storage unit 36 ​​of the meter-side wireless device 30 stores an ID for each of the multiple gas alarms 10 (see Figure 1) that are in a wireless connection state. When the deletion processing unit 31a receives a deletion request, it deletes the ID from the storage unit 36 ​​for the gas alarm 10 for which the wireless connection state has been denied.

[0034] The first communication unit 32 communicates with the gas meter 40 via a wired connection. In particular, in this embodiment, the first communication unit 32 includes a connection call transmission unit 32a. The first timer 34, like the timers 15 and 24 described above, measures a predetermined time interval. The connection call transmission unit 32a sends a connection call to the gas meter 40 at predetermined intervals (an example of a predetermined timing) measured by the first timer 34. This connection call transmission unit 32a sends a connection call to the gas alarm 10 whose ID is stored in the storage unit 36. Therefore, the connection call transmission unit 32a sends a connection call at predetermined intervals for gas alarms 10 whose ID has not been deleted from the storage unit 36 ​​by the deletion processing unit 31a and for which a deletion request has not been received. On the other hand, the connection call transmission unit 32a does not send a connection call to gas alarms 10 whose ID has been deleted from the storage unit 36 ​​by the deletion processing unit 31a and for which a deletion request has been received.

[0035] Thus, the connection call transmission unit 32a initiates a connection call for gas alarms 10 from which a deletion request has not been sent from the alarm-side wireless device 20, and prohibits the initiation of a connection call for gas alarms 10 from which a deletion request has been sent from the alarm-side wireless device 20. In other words, in this embodiment, if there is no deletion request from the alarm-side wireless device 20, the meter-side wireless device 30 initiates a connection call to the gas meter 40, assuming that the gas alarm 10 and the gas meter 40 are wirelessly connected.

[0036] Furthermore, the first communication unit 32 includes a deletion request transmission unit 32b. The deletion request transmission unit 32b sends a deletion request to the gas meter 40 for the gas alarm 10 whose ID has been deleted. As a result, the ID of the gas alarm 10 that is managed as being in a wireless connection state by the gas meter 40 is deleted, and the wireless connection state between the gas alarm 10 and the gas meter 40 is denied. As will be described later, the deletion request transmission unit 32b is not mandatory and may be omitted.

[0037] The gas meter 40 includes a flow rate measuring unit 41, a control unit 42, a communication unit 43, a timer 44, and a storage unit 45.

[0038] The flow rate measuring unit 41 measures the flow rate of fuel gas supplied to the consumer via the gas meter 40. The flow rate measured by this flow rate measuring unit 41 is cumulatively displayed on a display unit (not shown) located on the front of the gas meter 40.

[0039] The control unit 42 controls the entire gas meter 40 and, in this embodiment, includes a deletion processing unit 42a. Here, the storage unit 45 stores the ID of each of the multiple gas alarms 10 that are in a wireless connection state. The deletion processing unit 42a executes a process to delete the ID of the gas alarm 10 whose wireless connection state has been denied.

[0040] More specifically, when the deletion processing unit 42a receives a deletion request from the deletion request transmission unit 32b of the meter-side wireless device 30, it deletes the ID of the gas alarm 10 in question from the storage unit 45. Furthermore, if the deletion processing unit 42a does not receive any connection calls while a predetermined time is being measured, it deletes the ID of the gas alarm 10 in question from the storage unit 45. The predetermined time is measured by the timer 44. Also, from the viewpoint of improving accuracy, the deletion processing unit 42a may execute the deletion process if the state of not receiving any connection calls while a predetermined time is being measured occurs N times in a row.

[0041] Here, the meter-side wireless device 30 does not necessarily have a deletion request transmission unit 32b. This is because even if the meter-side wireless device 30 does not send a deletion request to the gas meter 40, the meter-side wireless device 30 will perform the deletion process, preventing connection calls from being made. In other words, when connection calls are no longer made from the meter-side wireless device 30, the deletion processing unit 42a of the gas meter 40 will perform the deletion process based on the fact that it cannot receive connection calls. Of course, if the meter-side wireless device 30 sends a deletion request, the ID will be deleted more quickly in the gas meter 40, so it is preferable to have a deletion request transmission unit 32b if you want to delete it quickly.

[0042] As described above, in the gas management system 1 according to this embodiment, the gas alarm 10 initiates a connection call, but this connection call is not transmitted from the alarm-side wireless device 20 to the meter-side wireless device 30. Furthermore, the meter-side wireless device 30 initiates a connection call to the gas meter 40, assuming that the gas alarm 10 is in a wireless connection state, unless a deletion request is received from the alarm-side wireless device 20. Therefore, the increase in power consumption due to wireless communication for connection calls is suppressed, and because a connection call is made to the gas meter 40, the deletion of the ID of the gas alarm 10, which is in a wireless connection state, is also prevented from happening at the gas meter 40.

[0043] Furthermore, in this embodiment, the meter-side wireless device 30 is equipped with a search request transmission unit 33a in the second communication unit 33. This search request transmission unit 33a transmits a search request to the alarm-side wireless device 20 corresponding to the gas alarm 10 in order to confirm that the gas alarm 10 with the ID stored in the storage unit 36 ​​is in a wireless connection state. Furthermore, the meter-side wireless device 30 measures a specific time (for example, one day, which is longer than a predetermined time) using the second timer 35. The search request transmission unit 33a transmits a search request at specific time intervals (an example of a specific timing) measured by the second timer 35.

[0044] As shown in Figure 2, the alarm-side wireless device 20 receives a connection call from the gas alarm 10 and does not receive an abnormal signal. Upon receiving a search request, the second communication unit 23 sends back a predetermined response signal. As shown in Figure 3, the control unit 31 of the meter-side wireless device 30 confirms that the gas alarm 10 is in a wireless connection state when it receives the predetermined response signal. On the other hand, if the control unit 31 does not receive the predetermined response signal, it determines that the gas alarm 10 is not in a wireless connection state. In this case, the deletion processing unit 31a deletes the ID of the gas alarm 10 from the storage unit 36, and the deletion request transmission unit 32b sends a deletion request to the gas meter 40 for the gas alarm 10 in question.

[0045] In this embodiment, the meter-side wireless device 30 transmits a connection call to the gas meter 40 unless a deletion request is received. Therefore, even if, for example, the alarm-side wireless device 20 malfunctions and is unable to transmit a deletion request, the meter-side wireless device 30 will continue to transmit a connection call to the gas meter 40. In this case, the gas meter 40 will continue to recognize the gas alarm 10, which is not in a wireless connection state, as being in a wireless connection state. However, by sending a search request from the meter-side wireless device 30, it is possible to confirm that the alarm-side wireless device 20 is in a wireless connection state even if it malfunctions.

[0046] Next, with reference to Figure 4, an overview of the wireless connection method according to this embodiment will be described. Figure 4 is a first configuration diagram showing an overview of the control method of the gas management system 1 according to this embodiment. First, the memory unit 16 (see Figure 2) of each gas alarm 10 shown in Figure 4 stores an ID. For the sake of convenience in the following explanation, the ID will be represented by a single digit, with the ID of the first gas alarm 10a being A, the ID of the second gas alarm 10b being B, and the ID of the third gas alarm 10c being C.

[0047] These gas alarms 10 perform connection calls (see connection calls A to C) at predetermined intervals, for example. At this time, the first to third gas alarms 10a to 10c also transmit their own IDs along with the connection call. Furthermore, the deletion event determination unit 21a (see Figure 2) of the first to third alarm-side wireless devices 20a to 20c determines that no predetermined deletion event has occurred when a connection call has been received and no abnormal signal has been received. For this reason, the deletion request transmission unit 23a (see Figure 2) of the first to third alarm-side wireless devices 20a to 20c does not transmit a deletion request.

[0048] Furthermore, the connection call transmission unit 32a (see Figure 3) of the meter-side wireless device 30, unless it receives a deletion request, makes connection calls (see connection calls A to C) at predetermined intervals for the gas alarm 10 with IDs stored in the memory unit 36 ​​(see Figure 3). This allows the gas meter 40 to understand that the first to third gas alarms 10a to 10c are in a wireless connection state, preventing the IDs from being deleted from the gas meter 40's memory unit 45 (see Figure 3) (see IDs A to C). In particular, as is clear from Figure 4, connection calls are not wirelessly transmitted from each alarm-side wireless device 20 to the meter-side wireless device 30, thus reducing power consumption.

[0049] Figure 5 is a second configuration diagram showing an overview of the control method of the gas management system 1 according to this embodiment. As shown in Figure 5, for example, suppose the wired connection between the first gas alarm 10a and the first alarm-side wireless device 20a is disconnected. In this case, the connection call from the first gas alarm 10a will not be received by the first alarm-side wireless device 20a. Therefore, the deletion event determination unit 21a (see Figure 2) of the first alarm-side wireless device 20a will determine that a predetermined deletion event has occurred, and the deletion request transmission unit 23a (see Figure 2) of the first alarm-side wireless device 20a will transmit a deletion request. The second and third alarm-side wireless devices 20b and 20c will determine that no predetermined deletion event has occurred, as shown in Figure 4, and will not transmit a deletion request.

[0050] Furthermore, since the meter-side wireless device 30 receives a deletion request regarding the first gas alarm 10a, the deletion processing unit 31a (see Figure 3) deletes ID:A of the first gas alarm 10a from the storage unit 36 ​​(see Figure 3). For this reason, the connection call transmission unit 32a (see Figure 3) transmits connection calls for the second and third gas alarms 10b and 10c (see connection calls B and C), but does not transmit a connection call for the first gas alarm 10a.

[0051] As a result, the deletion processing unit 42a (see Figure 3) of the gas meter 40 deletes the ID of the first gas alarm 10a from the memory unit 45 (see Figure 3) if no connection call has been received for a predetermined period of time. On the other hand, for the second and third gas alarms 10b and 10c, which have received connection calls, the IDs are not deleted from the memory unit 45 (see IDs: B and C), and the gas meter 40 can recognize that the second and third gas alarms 10b and 10c are in a wireless connection state.

[0052] Furthermore, if the meter-side wireless device 30 is equipped with a deletion request transmission unit 32b (see Figure 3), the deletion processing unit 42a will delete the ID of the first gas alarm 10a from the storage unit 45 in accordance with the deletion request without confirming that no connection call has been received for a predetermined period of time.

[0053] Figure 6 is a third configuration diagram showing an overview of the control method of the gas management system 1 according to this embodiment. In Figure 6, it is assumed that the first alarm-side wireless device 20a is malfunctioning. Because the first alarm-side wireless device 20a is malfunctioning, the first gas alarm 10a and the gas meter 40 cannot communicate wirelessly, and it cannot be said that they are in a wireless connection state. However, if the first alarm-side wireless device 20a is malfunctioning, a deletion request will not be sent either. For this reason, the meter-side wireless device 30 will continue to send connection calls to the first gas alarm 10a, from which it has not received a deletion request (see connection call A).

[0054] Figure 7 is a fourth configuration diagram showing an overview of the control method of the gas management system 1 according to this embodiment. However, as shown in Figure 7, the above problem is resolved by sending a search request from the meter-side wireless device 30. That is, the search request transmission unit 33a (see Figure 3) of the meter-side wireless device 30 sends a search request to each alarm-side wireless device 20 (see search requests A to C).

[0055] The second and third alarm-side wireless devices 20b and 20c respond to this search request (see responses B and C). As a result, the meter-side wireless device 30 determines that the second and third gas alarms 10b and 10c are in a wireless connection state via the second and third alarm-side wireless devices 20b and 20c. On the other hand, the first alarm-side wireless device 20a does not respond to the search request, and the meter-side wireless device 30 determines that the first gas alarm 10a is not in a wireless connection state.

[0056] Therefore, the deletion processing unit 31a (see Figure 3) of the meter-side wireless device 30 deletes ID:A of the first gas alarm 10a from the storage unit 36 ​​(see Figure 3). Consequently, the connection call transmission unit 32a (see Figure 3) transmits connection calls for the second and third gas alarms 10b and 10c (see connection calls B and C), but does not transmit a connection call for the first gas alarm 10a.

[0057] As a result, the deletion processing unit 42a (see Figure 3) of the gas meter 40 deletes the ID of the first gas alarm 10a from the memory unit 45 (see Figure 3) if no connection call has been received for a predetermined period of time. On the other hand, for the second and third gas alarms 10b and 10c, which have received connection calls, the IDs are not deleted from the memory unit 45 (see IDs: B and C), and the gas meter 40 can recognize that the second and third gas alarms 10b and 10c are in a wireless connection state.

[0058] Furthermore, if the meter-side wireless device 30 is equipped with a deletion request transmission unit 32b (see Figure 3), the deletion processing unit 42a will delete the ID of the first gas alarm 10a from the storage unit 45 in accordance with the deletion request, without confirming that no connection call has been received for a predetermined period of time, as in the case shown in Figure 5.

[0059] Next, with reference to Figures 8 to 12, the control methods for each part 10, 20, 30, and 40 will be described in detail.

[0060] Figure 8 is a flowchart illustrating the control method for the gas alarm 10 shown in Figure 2. As shown in Figure 8, in the gas alarm 10 which is wired to the alarm-side wireless device 20, the control unit 12 first starts the timer 15 (S1). Next, the control unit 12 determines whether the value of the timer 15 has reached a predetermined value (S2). If the value of the timer 15 has not reached the predetermined value (S2: NO), the process proceeds to step S5.

[0061] When the value of timer 15 reaches a predetermined value (S2: YES), the connection call transmission unit 14a transmits a connection call to the alarm-side wireless device 20 (S3). Subsequently, the control unit 12 initializes timer 15 (S4), and the process proceeds to step S5.

[0062] In step S5, the abnormal condition detection unit 12a of the control unit 12 determines whether an abnormal condition such as a sensor malfunction has occurred (S5). If no abnormal condition has occurred (S5: NO), the process proceeds to step S7. If an abnormal condition has occurred (S5: YES), the abnormal signal transmission unit 14b transmits an abnormal signal to the alarm-side wireless device 20 (S6). Then, the process proceeds to step S7.

[0063] In step S7, the control unit 12 determines whether the power is turned off (S7). If the power is not turned off (S7:NO), the process proceeds to step S2. On the other hand, if the power is turned off (S7:YES), the process shown in Figure 8 is terminated.

[0064] Figure 9 is a flowchart showing the control method for the alarm-side wireless device 20 shown in Figure 2. As shown in Figure 9, the control unit 21 of the alarm-side wireless device 20 starts the timer 24 (S11). Next, the deletion event determination unit 21a determines whether a connection call has been received (S12). If a connection call has been received (S12: YES), the control unit 21 initializes the timer 24 (S13), and the process proceeds to step S16.

[0065] If no connection call has been received (S12:NO), the deletion event determination unit 21a determines whether the value of timer 24 has reached a predetermined value (S14). If the value of timer 24 has not reached a predetermined value (S14:NO), the process proceeds to step S16.

[0066] If the value of timer 24 reaches a predetermined value (S14: YES), the deletion event determination unit 21a determines whether the state of reaching the predetermined value has occurred N times consecutively (S15). If the state of reaching the predetermined value has not occurred N times consecutively (S15: NO), the control unit 21 initializes timer 24 (S13), and the process proceeds to step S16.

[0067] In step S16, the deletion event determination unit 21a determines whether an abnormal signal has been received (S16). If no abnormal signal has been received (S16: NO), the process proceeds to step S18.

[0068] On the other hand, if the predetermined value is reached N times in a row (S15:YES), or if an abnormal signal is received (S16:YES), the deletion event determination unit 21a determines that a predetermined deletion event has occurred, and the deletion request transmission unit 23a transmits a deletion request to the meter-side wireless device 30 (S17). After that, the process moves to step S18.

[0069] In step S18, the control unit 21 determines whether the power is turned off (S18). If the power is not turned off (S18: NO), the process proceeds to step S12. On the other hand, if the power is turned off (S18: YES), the process shown in Figure 9 is terminated.

[0070] Figure 10 is a flowchart showing the control method for the meter-side wireless device 30 shown in Figure 3. As shown in Figure 10, the control unit 31 of the meter-side wireless device 30 starts the first timer 34 (S21). Next, the control unit 31 determines whether the value of the first timer 34 has reached a predetermined value (S22). If the value of the first timer 34 has not reached the predetermined value (S22: NO), the process proceeds to step S25.

[0071] When the value of the first timer 34 reaches a predetermined value (S22: YES), the connection call transmission unit 32a transmits a connection call to the gas meter 40 (S23). Subsequently, the control unit 31 initializes the first timer 34 (S24), and the process proceeds to step S25.

[0072] In step S25, the control unit 31 determines whether a deletion request has been received (S25). If no deletion request has been received (S25: NO), the process proceeds to step S28. If a deletion request has been received (S25: YES), the deletion processing unit 31a deletes the ID of the corresponding gas alarm 10 from the storage unit 36 ​​(S26). Subsequently, the deletion request transmission unit 32b sends a deletion request to the gas meter 40 to delete the ID of the corresponding gas alarm 10 (S27). The process then proceeds to step S28.

[0073] In step S28, the control unit 31 determines whether the power is turned off (S28). If the power is not turned off (S28: NO), the process proceeds to step S22. On the other hand, if the power is turned off (S28: YES), the process shown in Figure 10 is terminated.

[0074] Figure 11 is a flowchart showing the control method for the gas meter 40 shown in Figure 3. As shown in Figure 11, the control unit 42 of the gas meter 40 starts the timer 44 (S31). Next, the control unit 42 determines whether a deletion request has been received (S32). If a deletion request is received (S32: YES), the process proceeds to step S37.

[0075] If no deletion request has been received (S32: NO), the control unit 42 determines whether a connection call has been received (S33). If a connection call has been received (S33: YES), the control unit 42 initializes the timer 44 (S34), and the process proceeds to step S38.

[0076] If no connection call has been received (S33:NO), the control unit 42 determines whether the value of the timer 44 has reached a predetermined value (S35). If the value of the timer 44 has not reached a predetermined value (S35:NO), the process proceeds to step S38.

[0077] If the value of timer 44 reaches a predetermined value (S35: YES), the control unit 42 determines whether the state of reaching the predetermined value has occurred N times consecutively (S36). If the state of reaching the predetermined value has not occurred N times consecutively (S36: NO), the control unit 42 initializes timer 44 (S34), and the process proceeds to step S38.

[0078] If the predetermined value is reached N times in a row (S36: YES), the deletion processing unit 42a deletes the ID of the gas alarm 10 from the storage unit 45 based on the fact that no connection call was received or a deletion request (S37). Then the process moves on to step S38.

[0079] In step S38, the control unit 42 determines whether the power is turned off (S38). If the power is not turned off (S38: NO), the process proceeds to step S32. On the other hand, if the power is turned off (S38: YES), the process shown in Figure 11 is terminated.

[0080] Figure 12 is a second flowchart showing the control method for the meter-side wireless device 30 shown in Figure 3. As shown in Figure 12, the control unit 31 of the meter-side wireless device 30 starts the second timer 35 (S41). Next, the control unit 31 determines whether the value of the second timer 35 has reached a predetermined value (S42). If the value of the second timer 35 has not reached the predetermined value (S42: NO), the process proceeds to step S45.

[0081] When the value of the second timer 35 reaches a predetermined value (S42: YES), the search request transmission unit 33a transmits a search request to the alarm-side wireless device 20 (S43). Subsequently, the control unit 31 initializes the second timer 35 (S44), and the process proceeds to step S45.

[0082] In step S45, the control unit 31 determines whether a predetermined response has been received (S45). If a predetermined response has been received (S45: YES), the process proceeds to step S48. If no predetermined response has been received (S45: NO), the deletion request transmission unit 32b sends a deletion request to the gas meter 40 to delete the ID of the gas alarm 10 in question (S46). Subsequently, the deletion processing unit 31a deletes the ID of the gas alarm 10 in question from the storage unit 36 ​​(S47). Then, the process proceeds to step S48.

[0083] In step S48, the control unit 31 determines whether the power is turned off (S48). If the power is not turned off (S48: NO), the process proceeds to step S42. On the other hand, if the power is turned off (S48: YES), the process shown in Figure 12 is terminated.

[0084] In this way, according to the wireless system WS and gas management system 1 of this embodiment, the alarm-side wireless device 20 transmits a deletion request to the meter-side wireless device 30, but does not transmit a connection call to the meter-side wireless device 30, thereby reducing power consumption due to wireless communication for connection calls. Furthermore, until the meter-side wireless device 30 receives a deletion request, it assumes that the gas alarm 10 and the gas meter 40 are in a wireless connection state and makes a connection call to the gas meter 40. This prevents the gas alarm 10's ID from being deleted in the gas meter 40 due to the connection call not being transmitted wirelessly. Therefore, it is possible to suppress power consumption related to connection calls while preventing the deletion of the gas alarm 10's ID in a wireless connection state in the gas meter 40.

[0085] Furthermore, if the alarm-side wireless device 20 cannot receive a connection call transmitted from the gas alarm 10, it determines that a predetermined deletion event has occurred and sends a deletion request. Therefore, it can send a deletion request when there is a high probability that the gas alarm 10 has been removed, and can send an appropriate deletion request.

[0086] Furthermore, the meter-side wireless device 30 includes a storage unit 36 ​​that stores the IDs of gas alarms 10 that are in a wireless connection state, and when it receives a deletion request, it deletes the ID corresponding to the deletion request from the storage unit 36. In this way, the meter-side wireless device 30 can prevent future connection calls from being made to gas alarms 10 with the ID corresponding to the deletion request. In addition, the meter-side wireless device 30 includes a deletion request transmission unit 32b, and when it receives a deletion request from the alarm-side wireless device 20, it also transmits the deletion request to the gas meter 40. As a result, the gas meter 40 can quickly delete the ID in response to a deletion request from the meter-side wireless device 30 without having to go through the procedure of confirming that no connection calls will be received before deleting the ID.

[0087] Furthermore, if a search request is sent and no predetermined response is received, the ID is deleted. Therefore, even if, for example, the alarm-side wireless device 20 is malfunctioning and a deletion request is not sent in the first place, the meter-side wireless device 30 can confirm that the wireless connection is not active through an inquiry.

[0088] Furthermore, the alarm-side wireless device 20 and meter-side wireless device 30 according to this embodiment can contribute to providing a wireless system WS that can suppress power consumption related to connection calls while preventing the deletion of the ID of the gas alarm 10 in a wireless connection state on the gas meter 40 side.

[0089] Next, a second embodiment of the present invention will be described. The gas management system 2 according to the second embodiment is similar to that of the first embodiment, but some of its components differ from those of the first embodiment. The differences from the first embodiment will be explained below.

[0090] Figure 13 is a diagram showing the configuration of the gas management system according to the second embodiment. As shown in Figure 13, the gas management system 2 according to the second embodiment includes a plurality of gas alarms 50 and a gas meter 60. In the second embodiment, the configurations corresponding to the alarm-side wireless device 20 and meter-side wireless device 30 shown in the first embodiment (see reference numerals 52 and 61 described later) are built into the gas alarms 50 and gas meters 60. This built-in configuration constitutes the wireless system WS (see Figures 14 and 15).

[0091] Figure 14 is a block diagram showing the configuration of the gas alarm 50 shown in Figure 13. The gas alarm 50 according to the second embodiment includes a gas alarm function unit 51 and a wireless function unit (alarm-side wireless device) 52, as shown in Figure 14.

[0092] The gas alarm function unit 51 includes a gas sensor 51a, a control unit 51b, a notification unit 51c, a communication unit 51d, a timer 51e, and a storage unit 51f. The control unit 51b includes an abnormal state detection unit 51b1. The communication unit 51d includes a connection call transmission unit 51d1 and an abnormal signal transmission unit 51d2. Here, the gas sensor 51a, control unit 51b, notification unit 51c, timer 51e, and storage unit 51f are the same as the gas sensor 11, control unit 12, notification unit 13, timer 15, and storage unit 16 shown in Figure 2. Furthermore, the communication unit 51d according to the second embodiment is the same as the communication unit 14 shown in Figure 2, except that the communication partner is the wireless function unit 52. This communication unit 51d transmits connection call and abnormal signals to the wireless function unit 52.

[0093] Furthermore, the wireless function unit 52 includes a control unit 52a, a first communication unit 52b, a second communication unit 52c, a timer 52d, and a storage unit 52e. The control unit 52a includes a deletion event determination unit 52a1. The second communication unit 52c includes a deletion request transmission unit 52c1. Here, the control unit 52a, timer 52d, and storage unit 52e are the same as the control unit 21, timer 24, and storage unit 25 shown in Figure 2. Also, the first communication unit 52b in the second embodiment is the same as the first communication unit 22 shown in Figure 2, except that the communication partner is the gas alarm function unit 51. The second communication unit 52c is the same as the second communication unit 23 shown in Figure 2, except that the communication partner is the wireless function unit 61, which will be described later. In the second embodiment, the first communication unit 52b receives connection call and abnormal signal from the gas alarm function unit 51, and the second communication unit 52c transmits a deletion request to the wireless function unit 61, which will be described later.

[0094] Figure 15 is a block diagram showing the configuration of the gas meter 60 shown in Figure 13. The gas meter 60 according to the second embodiment includes a wireless function unit (meter-side wireless device) 61 and a meter function unit 62, as shown in Figure 15.

[0095] The wireless function unit 61 comprises a control unit 61a, a first communication unit 61b, a second communication unit 61c, a first timer 61d, a second timer 61e, and a storage unit (storage means) 61f. The control unit 61a includes a deletion processing unit 61a1. The first communication unit 61b includes a connection call transmission unit 61b1 and a deletion request transmission unit 61b2. The second communication unit 61c includes a search request transmission unit 61c1. The control unit 61a, the first timer 61d, the second timer 61e, and the storage unit 61f are the same as the control unit 31, the first timer 34, the second timer 35, and the storage unit 36 ​​shown in Figure 3. Furthermore, the first communication unit 61b according to the second embodiment is the same as the first communication unit 32 shown in Figure 3, except that the communication partner is the meter function unit 62. The second communication unit 61c is the same as the second communication unit 33 shown in Figure 3, except that its communication partner is the wireless function unit 52 of the gas alarm 50. In the second embodiment, the first communication unit 61b transmits a connection call and deletion request to the meter function unit 62, and the second communication unit 61c transmits a search request to the wireless function unit 52 of the gas alarm 50.

[0096] The meter function unit 62 comprises a flow rate measurement unit 62a, a control unit 62b, a communication unit 62c, a timer 62d, and a storage unit 62e. The flow rate measurement unit 62a, control unit 62b, timer 62d, and storage unit 62e are the same as the flow rate measurement unit 41, control unit 42, timer 44, and storage unit 45 shown in Figure 3. Furthermore, the communication unit 62c according to the second embodiment is the same as the communication unit 43 shown in Figure 3, except that its communication partner is the wireless function unit 61. This communication unit 62c receives connection call initiation and deletion requests from the wireless function unit 61.

[0097] In this second embodiment of the gas management system 2, similar to the first embodiment, the wireless function unit 52 receives connection calls from the gas alarm function unit 51, but the wireless function unit 52 does not transmit connection calls to the wireless function unit 61 of the gas meter 60. On the other hand, if the wireless function unit 52 of the gas alarm 50 is unable to receive connection calls from the gas alarm function unit 51 or receives an abnormal signal, it transmits a deletion request to the wireless function unit 61 of the gas meter 60. Furthermore, the wireless function unit 61 of the gas meter 60 transmits connection calls to the meter function unit 62 unless it receives a deletion request from the wireless function unit 52 of the gas alarm 50.

[0098] The processing according to the second embodiment is the same as that shown in Figures 8 to 12.

[0099] In this way, according to the wireless system WS, gas management system 2, and wireless function units 52 and 61 of the second embodiment, it is possible to prevent the deletion of the ID of the gas alarm 50 in a wireless connection state on the gas meter 60 side, similar to the first embodiment, while suppressing power consumption related to connection calls.

[0100] Although the present invention has been described above based on embodiments, the present invention is not limited to the above embodiments, and technologies from the embodiments and other technologies may be combined as appropriate without departing from the spirit of the present invention.

[0101] For example, in the first embodiment, the gas alarm 10 and the alarm-side wireless device 20 are connected by a wire, but the connection is not limited to this; they may also be externally connected without using signal lines, such as by connecting connectors. The same applies to the meter-side wireless device 30 and the gas meter 40.

[0102] Furthermore, in the above embodiment, the alarm-side wireless device 20 and the wireless function unit 52 are configured not to transmit connection calls wirelessly, but a period of time for temporarily transmitting connection calls may be provided. For example, instead of transmitting 20 connection calls conventionally, a reduction process may be implemented such that 3 out of 4 calls are not transmitted and only one is transmitted. In this case as well, the period during which "connection calls are not transmitted to the meter-side wireless device 30" is still provided, and power consumption is reduced.

[0103] Furthermore, while timers 15, 24, 34, 44, 51e, 52d, 61d, and 62d all measure predetermined time intervals as described above, this is not limited to this configuration, and it is not necessary for at least one of them to measure predetermined time intervals. For example, if the gas alarm 10 transmits a connection call once every 10 minutes, timer 15 will measure 10 minutes. On the other hand, if the alarm-side wireless device 20 determines that a predetermined deletion event has occurred when it has not received a connection call within 10 minutes for two consecutive periods, timer 24 will also measure 10 minutes. In this case, the alarm-side wireless device 20 may also determine that a predetermined deletion event has occurred when timer 24 measures 20 minutes and does not receive a connection call even once.

[0104] In addition, each timer 15, 24, 34, 44, 51e, 52d, 61d, and 62d does not need to be synchronized. Furthermore, each timer 15, 24, 34, 35, 44, 51e, 52d, 61d, 61e, and 62d may be either a count-up type or a count-down type.

[0105] Furthermore, in the above embodiment, if the meter-side wireless device 30 or wireless function unit 61 is equipped with deletion request transmission units 32b, 61b2 and sends a deletion request to the gas meter 40 or meter function unit 62, it may request the gas meter 40 or meter function unit 62 to return an ID that is managed as being in a wireless connection state within the storage units 45, 52e in order to confirm whether the deletion was performed appropriately.

[0106] Furthermore, in the second embodiment, the gas alarm function unit 51 initiates a connection call to the wireless function unit 52, but this is not limited to this, and it is not necessary to initiate a connection call if possible. For example, in the second embodiment, both the gas alarm function unit 51 and the wireless function unit 52 are built into the gas alarm 50. Therefore, the possibility that the connection between the two is secured is extremely high, and compared to the first embodiment, there is less need to initiate a connection call to confirm the connection. The same applies to the gas meter 60. [Explanation of Symbols]

[0107] 1,2: Gas Management System 10: Gas alarm 16: Storage section 20: Alarm side wireless device 21a: Deletion event determination unit 22: First Communications Department 23: Second Communications Department 23a: Deletion request transmission unit 25: Storage section 30: Meter-side wireless device 31a: Deletion processing unit 32: First Communications Department 32a: Connection Call Transmission Unit 32b: Deletion request transmission unit 33: Second Communications Department 33a: Search request transmission unit 36: Storage unit (storage means) 40: Gas meter 50: Gas alarm 51: Gas alarm function unit 51f: Storage section 52: Wireless function section (alarm side wireless device) 52a: Control Unit 52a1: Deletion Event Determination Unit 52b: First Communications Section 52c: Second Communications Department 52c1: Deletion request transmission unit 52e: Storage section 60: Gas meter 61: Wireless function unit (meter-side wireless device) 61a1: Deletion Processing Unit 61b: First Communications Department 61b1: Connection Call Transmission Unit 61b2: Deletion request transmission unit 61c: Second Communications Department 61c1: Search request transmission unit 61f: Memory unit (memory means) 62: Meter function unit WS: Wireless System

Claims

1. A wireless system comprising a wireless alarm device built into or externally connected to a gas alarm, and a wireless meter device built into or externally connected to a gas meter, which is capable of storing alarm information of a gas alarm that is in a wireless connection state and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that it is in a wireless connection state with the gas alarm, wherein information is transmitted and received wirelessly between the wireless alarm device and the wireless meter device, The alarm-side wireless device does not transmit the connection call to the meter-side wireless device, but transmits a deletion request to the meter-side wireless device that negates the wireless connection state when a predetermined deletion event occurs. The meter-side wireless device will initiate the connection call to the gas meter at a predetermined timing, even if it does not receive the connection call from the alarm-side wireless device, until it receives the deletion request from the alarm-side wireless device. A wireless system characterized by the following features.

2. The aforementioned alarm-side wireless device is externally connected to the gas alarm, and if it cannot receive the connection call transmitted from the gas alarm, it determines that the predetermined deletion event has occurred and transmits the deletion request. The wireless system according to feature 1.

3. The meter-side wireless device includes a storage means that stores alarm information of gas alarms that are in a wireless connection state, and transmits the connection call to the gas meter for the gas alarms in the alarm information stored by the storage means, and upon receiving the deletion request, deletes the alarm information corresponding to the deletion request from the storage means and transmits the deletion request to the gas meter. The wireless system according to feature 1.

4. The meter-side wireless device includes a storage means that stores alarm information of gas alarms that are in a wireless connection state, and sends a search request to the alarm-side wireless device corresponding to the gas alarm in the alarm information stored in the storage means at a specific timing to confirm whether the gas alarm is in a wireless connection state, and if there is no predetermined response from the alarm-side wireless device, the alarm information of the gas alarm corresponding to the alarm-side wireless device that did not give a predetermined response is deleted from the storage means. The wireless system according to feature 1.

5. A gas management system comprising a gas alarm, a wireless alarm-side device built into or externally connected to the gas alarm, a gas meter capable of storing alarm information of the gas alarm in a wireless connection state and deleting the alarm information of the gas alarm when it cannot receive a connection call indicating that it is wirelessly connected to the gas alarm, and a wireless meter-side device built into or externally connected to the gas meter, wherein information is transmitted and received wirelessly between the wireless alarm-side device and the wireless meter-side device, The alarm-side wireless device does not transmit the connection call to the meter-side wireless device, but transmits a deletion request to the meter-side wireless device that negates the wireless connection state when a predetermined deletion event occurs. The meter-side wireless device will initiate the connection call to the gas meter at a predetermined timing, even if it does not receive the connection call from the alarm-side wireless device, until it receives the deletion request from the alarm-side wireless device. A gas management system characterized by the following features.

6. A gas meter that can store the alarm information of a gas alarm that is in a wireless connection state and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that the gas alarm and itself are in a wireless connection state, transmits and receives information wirelessly with a meter-side wireless device that is built into or externally connected to the gas alarm, and an alarm-side wireless device that is built into or externally connected to the gas alarm, The connection call will not be transmitted to the meter-side wireless device. When a predetermined deletion event occurs, a deletion request that negates the wireless connection status is transmitted to the meter-side wireless device. A wireless alarm device characterized by the following features.

7. A gas meter-side wireless device that is built into or externally connected to a gas meter and transmits and receives information wirelessly with an alarm-side wireless device built into or externally connected to a gas alarm, which is capable of storing alarm information of a gas alarm that is in a wireless connection state and deletes the alarm information of the gas alarm when it cannot receive a connection call indicating that it is in a wireless connection state with the gas alarm, Until a deletion request is received from the gas alarm's wireless device indicating that the gas alarm and gas meter are wirelessly connected, the gas alarm will initiate a connection call to the gas meter at a predetermined timing, even if it does not receive a connection call from the gas alarm's wireless device indicating that the gas alarm and gas meter are wirelessly connected. A meter-side wireless device characterized by the following features.

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