JP7743324B2 - Fault Monitoring System - Google Patents

Description

The present invention relates to a fault monitoring system .

In clean environments (places where air purity is ensured) such as clean rooms and data centers, it is important to detect and deal with risks such as fires early. Therefore, when minute amounts of smoke that are invisible to the naked eye are generated, high-performance smoke detectors are sometimes used to detect them.

Patent Document 1 can be cited as a document related to the prior art. The remote monitoring system for fire alarm equipment described in Patent Document 1 uses a shutoff switch to shut off the alarm, and is designed to prevent the shutoff switch from being forgotten to be returned to its original position after testing is complete.

Japanese Patent Application Laid-Open No. 2005-258600

While it is of course important to use a high-performance smoke detector to detect minute amounts of smoke that are invisible to the naked eye, it is just as important to know when a high-performance smoke detector has malfunctioned. This is because if you do not notice that a high-performance smoke detector has malfunctioned, you will not be able to detect the generation of minute amounts of smoke.

Furthermore, even if it is known that a high-performance smoke detector or similar device has failed, if the subsequent response is not clear, there is a risk of a serious accident occurring. For example, it is conceivable that when a high-performance smoke detector or similar device fails, there will be no clear decision on how to respond, such as to whom to notify the device of the failure. As a result, there is a risk that the response to the failure will be inconsistent each time a failure occurs, leading to a serious accident.

The present invention aims to provide a failure monitoring system that can prevent serious accidents from occurring when a failure occurs in a high-performance smoke detector or the like that detects the generation of minute amounts of smoke in a place where air cleanliness is ensured.

The first invention is a fault monitoring system comprising an ultra-high sensitivity smoke detection device that detects the generation of minute amounts of smoke in a location where air cleanliness is ensured, a pipe for collecting minute amounts of smoke in the location where air cleanliness is ensured and sending it to the ultra-high sensitivity smoke detection device, a flow rate detection device that detects the flow rate of air flowing through the pipe and emits a second fault occurrence signal when the detected flow rate is outside a predetermined range, and a monitoring device that, when it receives the second fault occurrence signal from the flow rate detection device via a third network , sends a notification that a fault has occurred in the pipe to a terminal via a fourth network, wherein a plurality of the pipes extend from the ultra-high sensitivity smoke detection device, and a plurality of the flow rate detection devices are provided, each of which is configured to detect the flow rate of air flowing through each of the plurality of pipes, and each of the plurality of pipes is provided with a switching valve, and by switching these multiple switching valves, air can be allowed to flow through any of the plurality of pipes .

A second invention is a fault monitoring system in which the flow detection device sends a signal to the monitoring device at predetermined time intervals to check whether an abnormality has occurred in the third network, and the monitoring device is configured to send a notification to the terminal that a fault has occurred in the third network when it is unable to receive the signal to check whether an abnormality has occurred.

In a third invention, the monitoring device is configured to, when it receives a first fault occurrence signal from the ultra-high sensitivity smoke detection device via a first network, send a notification that a fault has occurred in the ultra-high sensitivity smoke detection device to a terminal via a second network, and the ultra-high sensitivity smoke detection device is a fault monitoring system comprising a laser light source that emits laser light, three photodiodes that detect light generated when the laser light emitted by the laser light source hits smoke or dust and is scattered, and a control board for these three photodiodes .

A fourth invention is a fault monitoring system in which the ultra-high sensitivity smoke detection device is configured to send a signal to the monitoring device at predetermined time intervals to check whether an abnormality has occurred on the first network, and the monitoring device is configured to send a notification to a terminal that a fault has occurred on the first network when the signal to check whether an abnormality has occurred cannot be received.

This invention has the effect of preventing serious accidents from occurring when a high-performance smoke detector, which detects the generation of even trace amounts of smoke in a location where air cleanliness is ensured, malfunctions.

1 is a diagram showing a schematic configuration of a fire monitoring system according to an embodiment of the present invention; FIG. 2 is a diagram showing a verification operation of the LAN of the fire monitoring system shown in FIG. 1; FIG. 10 is a diagram showing a schematic configuration of another fire monitoring system according to an embodiment of the present invention. FIG. 4 is a diagram showing a verification operation of the fire monitoring system shown in FIG. 3 . FIG. 2 is a diagram showing an example of a monitoring screen in the fire monitoring system according to the embodiment of the present invention. 10A and 10B are diagrams illustrating an example of an email notification in the fire monitoring system according to the embodiment of the present invention. 1 is a diagram showing an example of installation of piping for collecting minute amounts of smoke in a fire monitoring system according to an embodiment of the present invention. FIG. FIG. 10 is a diagram showing another example of installation of piping for collecting trace amounts of smoke in a fire monitoring system according to an embodiment of the present invention. 1 is a diagram showing a schematic configuration of a first ultra-high sensitivity smoke detection device used in a fire monitoring system according to an embodiment of the present invention. 1 is a diagram showing a schematic configuration of a first ultra-high sensitivity smoke detection device used in a fire monitoring system according to an embodiment of the present invention. FIG. 10 is a diagram showing a schematic configuration of another fire monitoring system according to an embodiment of the present invention. FIG. 12 is a diagram showing the operation of the fire monitoring system shown in FIG. FIG. 10 is a diagram showing a schematic configuration of another fire monitoring system according to an embodiment of the present invention. FIG. 14 is a diagram showing the operation of the fire monitoring system shown in FIG. 13. FIG. 1 is a diagram showing the general configuration of a first ultra-high sensitivity smoke detection device used in a fire monitoring system according to an embodiment of the present invention, showing the parts excluding the laser chamber, etc.

As shown in Figures 1, 3, 11, and 13, a fire monitoring system 1 according to an embodiment of the present invention is configured with a first ultra-high sensitivity smoke detection device 3 and a monitoring device 5.

The first ultra-sensitive smoke detector 3 emits a first alarm signal when it detects the generation of minute amounts of smoke invisible to the naked eye in a location where air cleanliness is ensured (for example, a room 7 where air cleanliness is ensured (see Figures 7 and 8)).

An example of a place 7 where air cleanliness is ensured is a clean room or a data center. The first ultra-sensitive smoke detector 3 detects minute amounts of smoke present in the air within the clean room or other such place 7. Note that such minute amounts of smoke are impossible to detect with the naked eye.

9 and 10, the first ultra-sensitive smoke detector 3 is configured to include a housing 11 in which a laser chamber 9 is provided, a laser light source (laser light oscillator) 13, a suction unit 15 that sucks in air, a photodiode 17, a camera 19, and a control unit 21. A CMOS camera, for example, is used as the camera 19.
The laser light source 13, photodiode 17, camera 19, and control unit 21 are also provided in the housing 11. The control unit 21 is configured to include a CPU and a memory (not shown).

In the first ultra-sensitive smoke detection device 3, under the control of the control unit 21, air is sucked in from outside the housing 11 (e.g., a clean room) by the suction unit 15 and enters the laser chamber 9. The laser light source 13 emits laser light 23 into the laser chamber 9. If smoke or dust is present in the laser chamber 9, the laser light 23 emitted by the laser light source 13 hits the smoke or dust particles and is scattered.

The photodiode 17 detects light scattered by smoke or dust particles. The concentration of smoke or dust is determined based on the detection results from the photodiode 17. Note that reference numeral 25 in Figure 10 denotes a laser light absorbing material (e.g., a prism) that absorbs the laser light 23 emitted by the laser light source 13.

In addition, under the control of the control unit 21, the first ultra-sensitive smoke detection device 3 uses a camera (e.g., a CMOS camera) 19 to photograph particles in the laser chamber 9, and determines whether the photographed particles are smoke particles or particles other than smoke (e.g., dust). This determination is made, for example, by measuring the diameter and color of the smoke particles with the camera 19 and distinguishing between smoke and non-smoke substances (dust and water vapor) based on the diameter and color of the smoke particles.

Then, when the particles photographed by the camera 19 are determined to be smoke particles, and the smoke density exceeds a predetermined threshold, a first signal transmission is emitted from a first signal transmission generator (not shown).

The sensitivity range (smoke detection range) of the first ultra-high sensitivity smoke detector 3 is 0.001%/m to 20%/m. The sensitivity range of a typical smoke detector is around 10%/m. The first ultra-high sensitivity smoke detector 3 uses technology described in U.S. Patent No. 6,184,537, for example. Another example of the first ultra-high sensitivity smoke detector 3 is the "VESDA" from Nippon Dry Chemical Co., Ltd. Here, we will explain the unit of sensitivity range, "%/m." For example, if 100% of the light intensity from a light source is attenuated by 99% at a light receiving element located 1 m away, this is expressed as 1%/m.

As shown in Figures 11 and 13, the monitoring device 5 is installed in a guard post 27, a control room, or a guard room. Here, the monitoring device 5 is composed of a dedicated PC, and when it receives a first signal transfer from the first ultra-high sensitivity smoke detection device 3, it sends a notification (such as a first signal transfer signal) to the terminal 29, for example, by push notification, that a small amount of smoke has been detected. Note that the monitoring device 5 does not have to be a dedicated PC, but may be a general-purpose PC with dedicated software installed.

The first report signal is sent from the first ultra-high sensitivity smoke detection device 3 via the monitoring device 5 to the terminal 29 via a network 31 such as a LAN, WAN, Ethernet, or the Internet. The terminal 29 may be, for example, at least one of a general-purpose PC, a first mobile terminal carried by the person in charge of the room 7 where air cleanliness is ensured, and a second mobile terminal (not shown) carried by the monitor 45 (see Figure 13) of the room 7 where air cleanliness is ensured. A third mobile terminal, etc. may also be added to the terminal 29.

Furthermore, upon receiving the first notification signal, the monitoring device 5 or terminal 29 outputs audio, light, or video from the output section to indicate that a small amount of smoke has been generated in room 7, where air cleanliness is ensured.

The first alarm signal is an electrical signal transmitted via network 31. However, in addition to this electrical signal, the first alarm signal may also be composed of, for example, light or sound emitted from an output unit provided in first ultra-sensitive smoke detection device 3. In this case, a person near first ultra-sensitive smoke detection device 3 can know that first ultra-sensitive smoke detection device 3 has detected the generation of a small amount of smoke.

Furthermore, as shown in Figures 7 and 8, the fire monitoring system 1 is provided with a pipe 33 for collecting trace amounts of smoke and dust generated in the room 7 where air cleanliness is ensured. The first ultra-sensitive smoke detection device 3 is configured to detect trace amounts of smoke present in the air collected by the pipe 33.

In a room 7 where air cleanliness is ensured, there are multiple devices 35 installed that may generate smoke due to malfunctions or other issues. While the devices 35 almost never generate smoke, this does not mean that they will never generate smoke. Here, devices that may generate smoke are referred to as smoke-generating devices 35.

The piping 33 has multiple air suction holes 37 formed along its extension direction. Each of the multiple air suction holes 37 is located near each of the multiple smoke generation devices 35. This allows the small amount of smoke generated from each of the multiple smoke generation devices 35 to be quickly sucked in.

In other words, the air suction hole 37 of the piping 33 is positioned in a location where smoke generated by the smoke generation prevention device 35 can be sucked into the piping 33 as quickly and reliably as possible. For example, if the housing of the smoke generation prevention device 35 is provided with an air exhaust hole for exhausting air from within the housing, the air suction hole 37 of the piping 33 is positioned near the air exhaust hole.

Figures 7 and 8 show computer rooms such as those in data centers, with the white arrows representing the bottom-to-top airflow used to cool the heat generated by equipment 35 in room 7. Also, although not shown, in clean rooms such as those in semiconductor factories, clean air flows from top to bottom. Therefore, it is preferable that the air suction hole 37 of the piping 33 be positioned in the direction of the room's air flow, from the housing or air exhaust hole of the smoke-generating device 35. In the case of a computer room, the equipment 35 is primarily a computer, while in the case of a clean room in a semiconductor factory, the equipment 35 is primarily semiconductor manufacturing equipment (cleaners, coaters, exposure machines, vacuum equipment such as CVD, annealing equipment, etc.).

The base end of the pipe 33 is connected to an air suction port 39 (see Figure 9) provided in the housing 11 of the first ultra-sensitive smoke detection device 3. By operating the air suction unit 15 of the first ultra-sensitive smoke detection device 3, air is sucked into the pipe 33 through the air suction hole 37 of the pipe 33, and this sucked air passes through the pipe 33 and enters the laser chamber 9. The air that has entered the laser chamber 9 is exhausted to the outside of the housing 11 through an air exhaust port 41 (see Figure 9) provided in the housing 11.

The fire monitoring system 1 also includes a second ultra-sensitive smoke detector 43, as shown in FIG. 13. The second ultra-sensitive smoke detector 43 is portable. The second ultra-sensitive smoke detector 43 is used to identify the source of a small amount of smoke in a room 7 where air cleanliness is ensured when the first ultra-sensitive smoke detector 3 issues a first alarm signal.

As described above, multiple smoke detection devices 25 are installed in the room 7 where air cleanliness is ensured. When the first ultra-high sensitivity smoke detection device 3 emits the first alarm signal, the portable second ultra-high sensitivity smoke detection device 43 is moved appropriately to identify the smoke detection device 35 that is the source of the smoke from among the multiple smoke detection devices 35. In more detail, it may be possible to identify which part of the smoke detection device 35 is the source of the smoke.

To explain further, when the first ultra-high sensitivity smoke detection device 3 emits the first alarm signal, it is determined that smoke has been generated in the room 7 where air cleanliness is ensured. However, it is not possible to identify which of the multiple smoke detection devices 35 installed in the room 7 where air cleanliness is ensured has generated the smoke. Therefore, a monitor (on-site person in charge; security guard) 45 uses a portable second ultra-high sensitivity smoke detection device 43 to identify the source of the small amount of smoke.

The second ultra-sensitive smoke detector 43 detects minute amounts of smoke using a principle similar to that of the first ultra-sensitive smoke detector 3.

To explain further, when the first ultra-sensitive smoke detector 3 emits the first notification signal, the first mobile terminal notifies the supervisor carrying the first mobile terminal that a small amount of smoke has been generated in the room 7, where air cleanliness is ensured.

When the above-mentioned report is transmitted, the person in charge instructs the first mobile terminal, the network 31, and the monitor 45 (see Figure 13) at the location 7 where air cleanliness is ensured to identify the source of the small amount of smoke in the room 7 where air cleanliness is ensured. This instruction is given via a second mobile terminal (not shown) carried by the monitor 45.

The person in charge is the person who has the authority to operate the room 7 where air cleanliness is ensured and the smoke generation warning device 35 installed in this room 7. For example, the person in charge can stop the operation of the smoke generation warning device 35 at their discretion. Furthermore, the person in charge is usually one person who lives in a remote location away from the room 7 where air cleanliness is ensured.

The monitor 45 waits in a room (for example, guard post 27; see Figure 13) near the room 7 where air cleanliness is ensured, and constantly monitors the room 7 where air cleanliness is ensured and the smoke generation alarm device 35 installed in this room 7 for any abnormalities. Multiple people work as monitors 45 in shifts.

The monitor 45, having received the above instructions, carries the second ultra-sensitive smoke detection device 43 and enters the area where smoke generation was detected (room 7 where air cleanliness is ensured). The monitor 45 then uses the second ultra-sensitive smoke detection device 43 to check whether or not a trace amount of smoke is being generated from each of the multiple smoke generation warning devices 35, and identifies the smoke generation warning device 35 that is the source of the trace amount of smoke.

The second ultra-high sensitivity smoke detection device 43 is configured to emit a second alarm signal when it detects the generation of even a small amount of smoke. The second alarm signal is composed of light, sound, or the like emitted from an output unit provided in the second ultra-high sensitivity smoke detection device 43. The second alarm signal may also be a signal transmitted via the network 31, similar to the first alarm signal.

When a monitor 45 senses the second notification signal (a signal consisting of light, sound, etc.) emitted by the second ultra-high sensitivity smoke detection device 43, he uses the second mobile terminal to call the first mobile terminal (the first mobile terminal carried by the person in charge). He then conveys to the person in charge information (type, installation location, smoke concentration, changes in smoke concentration, location where the smoke was collected) about the smoke generation warning device 35 that is the source of the trace amount of smoke (smoke generation warning device identified as the smoke source).

The monitor 45 notifies the person in charge of the source of the small amount of smoke via the network 31 and an information terminal connected to this network 31, and asks for instructions from the person in charge.

When the monitor 45 notifies the person in charge of the source of a small amount of smoke, the person in charge instructs the monitor 45 on how to respond to the source of a small amount of smoke in the room 7 where air cleanliness is ensured (such as shutting down the smoke alarm device or waiting to see what happens). This instruction is given via the first mobile terminal, network 31, and second mobile terminal. When this instruction is given, the monitor 45 carries out the above-mentioned response method.

The monitoring device 5 is configured to record the first and second signal transfers, along with the time at which the signals were received, etc.

The second ultra-sensitive smoke detection device 43 may also serve as the first ultra-sensitive smoke detection device 3. In other words, instead of using two ultra-sensitive smoke detection devices, the first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43, a single ultra-sensitive smoke detection device may be used as both the first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43.

Furthermore, in the fire monitoring system 1, at least one of the first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43 is configured to be able to distinguish between smoke and dust, as described above. That is, only the first ultra-sensitive smoke detection device 3 is configured to be able to distinguish between smoke and dust. Alternatively, only the second ultra-sensitive smoke detection device 43 is configured to be able to distinguish between smoke and dust. Alternatively, both the first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43 are configured to be able to distinguish between smoke and dust.

The first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43 emit a transfer signal when smoke is identified, and do not emit a transfer signal when dust is identified. The first ultra-sensitive smoke detection device 3 and the second ultra-sensitive smoke detection device 43 may also be configured to emit a transfer signal (smoke detection transfer signal) when smoke is identified, and emit a transfer signal (dust detection transfer signal) when dust is identified.

Here, we will explain, for example, a fire monitoring method (fire monitoring procedure) performed using fire monitoring system 1.

The fire monitoring method comprises a detection stage (smoke detection stage), a reporting stage (responsible person reporting stage), a first instruction stage (first responsible person instruction stage), and an identification stage (smoke source identification stage). The fire monitoring method also comprises a notification stage (smoke source notification stage), a second instruction stage (second responsible person instruction stage), and an execution stage (countermeasure execution stage).

During the detection stage, a first ultra-sensitive smoke detector 3 installed in a designated location is used to detect the generation of even trace amounts of smoke in a room 7 where air cleanliness is ensured.

In the reporting stage, when a trace amount of smoke is detected in the detection stage, the fact that a trace amount of smoke has been detected is reported to the person in charge of the room 7 where air cleanliness is ensured. The above reporting is performed by the first ultra-high sensitivity smoke detection device 3 via the network 31 and an information terminal connected to this network 31.

To explain further, when the first ultra-sensitive smoke detector 3 detects the generation of even a small amount of smoke in a room 7 where air cleanliness is ensured during the detection stage, the first ultra-sensitive smoke detector 3 emits a first notification signal. This notification signal is received by the monitoring device 5 via the network 31.

The monitoring device 5 sends a message via the network 31 to the first mobile terminal carried by the person in charge that a small amount of smoke has been detected in the room 7, where air cleanliness is ensured. This makes the person in charge aware that a small amount of smoke has been detected in the room 7, where air cleanliness is ensured.

In the first instruction stage, when a report is sent in the report transfer stage, the person in charge instructs the monitor 45 in the room where air cleanliness is ensured to identify the source of the small amount of smoke in the room 7 where air cleanliness is ensured. The above instruction is given via the network 31 and an information terminal connected to this network 31.

To explain further, in the first instruction stage, the person in charge uses the first mobile terminal to send a command via network 31 to the second mobile terminal carried by monitor 45 to identify the source of a small amount of smoke in room 7, where air cleanliness is ensured. This allows monitor 45 to recognize that a small amount of smoke has been generated in room 7, where air cleanliness is ensured, and that a command has been issued to identify the source of the small amount of smoke.

In the identification stage, upon receiving the instruction in the first instruction stage, the monitor 45 uses the portable second ultra-sensitive smoke detection device 43 to identify the source of the small amount of smoke in the room 7 where air cleanliness is ensured.

In the notification stage, when a source of a small amount of smoke is identified in the identification stage, the monitor 45 notifies the person in charge of the source of the small amount of smoke. This notification is made via the network 31 and an information terminal connected to this network 31. In the notification stage, for example, the monitor 45 calls the person in charge's first mobile terminal using the second mobile terminal and notifies the person in charge of the identified source of the small amount of smoke.

The monitor 45 notifies the person in charge of the source of the small amount of smoke via the network 31 and an information terminal connected to this network 31, and asks for instructions from the person in charge.

In the second instruction stage, when a notification of a source of a small amount of smoke is received in the notification stage, the person in charge instructs the monitor 45 on how to deal with the generation of a small amount of smoke in the room 7 where air cleanliness is ensured (how to deal with the source of the small amount of smoke). This instruction is given via the network 31 and an information terminal connected to this network 31. In the second instruction stage, the person in charge calls the second mobile terminal of the monitor 45 using the first mobile terminal and tells the monitor 45 how to deal with the room 7 where air cleanliness is ensured.

In the execution stage, when a response method (countermeasure) is instructed in the second instruction stage, the monitor 45 carries out the instructed response method.

In addition, when a trace amount of smoke is detected during the first detection stage, the fact that a trace amount of smoke has been detected may also be transmitted (reported) to the monitor 45 in the room 7 where air cleanliness is ensured during the reporting stage. This reporting (reporting) is also performed by the first ultra-high sensitivity smoke detection device 3 via the network 31 and an information terminal connected to this network 31.

Now, we will explain the fire monitoring system 1 in more detail.

The fire monitoring system 1 shown in Figure 1 is composed of a first ultra-high sensitivity smoke detection device 3 and integrated software (dedicated software). Reference numeral 47 denotes a LAN cable, reference numeral 49 denotes a hub, reference numeral 31 (31A) denotes a LAN, and reference numeral 51 denotes an access point. When a PC (monitoring device) on which the integrated software is installed receives a first notification signal from the first ultra-high sensitivity smoke detection device 3, it sends an email (notification) to a terminal (not shown) indicating that a small amount of smoke has been detected.

Figure 5 shows an example of the monitoring screen of the monitoring device 5. On the monitoring screen shown in Figure 5, the change in air transparency (smoke concentration) over time is indicated by line L5. Figure 6 shows an example of the display content of the email notification. The monitoring screen shown in Figure 5 and the display content of the email notification shown in Figure 6 are used not only in the fire monitoring system 1 shown in Figure 1, but also in the fire monitoring systems 1 shown in Figures 3, 11, and 13.

The LAN verification operation of the fire monitoring system 1 shown in Figure 1 will be explained with reference to Figure 2. In step S21, the integrated software for the LAN function of the first ultra-high sensitivity smoke detection device 3 is checked, and monitoring by the integrated software is confirmed.

In step S23, the email function of the integrated software is checked, and email delivery linked to the ultra-high sensitivity smoke detection device to an internal company email address is confirmed.

The fire monitoring system 1 shown in Figure 3 is composed of a first ultra-high sensitivity smoke detection device 3 and integrated software. Reference numeral 47 denotes a LAN cable, reference numeral 49 denotes a HUB, reference numeral 31 (31B) denotes a WAN, reference numeral 51 denotes an access point, and reference numeral 53 denotes a router. When the integrated software receives a first notification signal from the first ultra-high sensitivity smoke detection device 3, it sends an email (notification) to a terminal (not shown) indicating that a small amount of smoke has been detected.

The LAN verification operation of the fire monitoring system 1 shown in Figure 3 will be explained with reference to Figure 4. In step S31, the integrated software for the LAN function of the first ultra-high sensitivity smoke detection device 3 is checked, and monitoring by the integrated software is confirmed.

In step S33, the email function of the integrated software is checked, and email delivery linked to the ultra-high sensitivity smoke detection device to an internal company email address is confirmed.

The fire monitoring system 1 shown in Figure 11 is composed of multiple first ultra-high sensitivity smoke detection devices (dedicated network) 3, a monitoring device (dedicated PC) 5, dedicated PCs 55 and 57, and a general-purpose PC 29. The multiple first ultra-high sensitivity smoke detection devices (dedicated network) 3 and the dedicated PC 55 are installed in a clean room data center, which is an example of a room 7 where air cleanliness is ensured. The monitoring device (dedicated PC) 5 is installed in a guard post 27. The dedicated PC 57 is installed in a satellite office. The general-purpose PC 29 is installed in the office.

The clean room data center 7 is also provided with a light-emitting unit 59. When the first ultra-high sensitivity smoke detection device 3 detects the generation of even a small amount of smoke, the light-emitting unit (LED) 59 emits light. When the first ultra-high sensitivity smoke detection device 3 detects the generation of even a small amount of smoke, the first ultra-high sensitivity smoke detection device 3 emits a beep.

In Figure 11, reference numeral 47 denotes an Ethernet cable or transmission line, reference numeral 31 (31C) denotes a LAN, and reference numeral 31 (31D) denotes a WAN. In the fire monitoring system 1 shown in Figure 11, the dedicated PCs 55 and 57 also function as monitoring devices 5. When the dedicated PC 55 receives a first notification signal from the first ultra-high sensitivity smoke detection device 3, it sends an email (notification) to the terminal 29 indicating that a small amount of smoke has been detected.

The alarm flow in the fire monitoring system 1 shown in Figure 11 will be explained with reference to Figure 12.

In step S121, when a fire alert is issued by the ultra-high sensitivity smoke detector, a beep is emitted, LED 59 lights up, and if a rotating light (not shown) is provided, the rotating light is turned on.

In step S123, the dedicated PC issues an alert via the dedicated network. This alert is an audio alarm, and the location of the fire alert pops up on the dedicated PC's screen. The smoke concentration detected by the ultra-high sensitivity smoke detector, a trend graph, and other information are also displayed on the screen.

In step S125, a notification is sent by email. That is, a notification of, for example, "fire" is sent from the dedicated PC to the configured email address (see Figure 6).

In step S127, the area where the fire occurred is confirmed on a dedicated PC, and on-site personnel and security guards rush to the scene of the fire.

In step S129, the person in charge (supervisor) who received the "fire" notification by email gives instructions to the on-site person in charge and security guards.

In step S131, after the fire has been extinguished, remote control is performed using a dedicated PC.

The fire monitoring system 1 shown in Figure 13 differs from the fire monitoring system 1 shown in Figure 11 in that a monitor 45 carries a second ultra-sensitive smoke detection device 43 and enters the clean room data center 7.

The alarm flow in the fire monitoring system 1 shown in Figure 13 will be explained with reference to Figure 14.

In step S141, when a fire alert is issued by the ultra-high sensitivity smoke detector, a beep is emitted, LED 59 lights up, and if a rotating light (not shown) is provided, the rotating light is turned on.

In step S143, the dedicated PC issues an alert via the dedicated network. This alert is an audio warning, and the location of the fire alert pops up on the dedicated PC's screen. The smoke concentration detected by the ultra-high sensitivity smoke detector, as well as a trend graph, are also displayed on the screen.

In step S145, a notification is sent by email. That is, a notification of, for example, "fire" is sent from the dedicated PC to the configured email address (see Figure 6).

In step S147, the area where the fire occurred is confirmed on a dedicated PC, and on-site personnel and security guards rush to the scene of the fire carrying handheld ultra-high sensitivity smoke detectors 43.

In step S149, the handheld ultra-high sensitivity smoke detector 43 is used to pinpoint the exact location of the fire (the location where the small amount of smoke is coming from) and respond to the fire. In addition, the person in charge (supervisor) who receives the "fire" notification by email gives instructions to the on-site person in charge and security guards.

In step S151, after the fire has been extinguished, remote control is performed using a dedicated PC.

The fire monitoring system 1 is comprised of a first ultra-sensitive smoke detection device 3 and a monitoring device 5. The first ultra-sensitive smoke detection device 3 emits a first alarm signal when it detects the generation of even a small amount of smoke in a room 7 where air cleanliness is ensured. When the monitoring device 5 receives the first alarm signal from the first ultra-sensitive smoke detection device 3, it sends a notification to a terminal (which may be a mobile terminal) 29 that a small amount of smoke has been generated.

This allows, for example, a person in charge of a room 7 with guaranteed air cleanliness to be notified without delay, no matter where they are, that a small amount of smoke has been generated in the room 7 with guaranteed air cleanliness. Simply by detecting the generation of invisible smoke, appropriate action can be taken immediately under the direction of a person in charge who is familiar with the knowledge and response methods for the room 7 with guaranteed air cleanliness. This makes it possible to prevent serious accidents from occurring in the room 7 with guaranteed air cleanliness.

Furthermore, in the fire monitoring system 1, a pipe 33 is provided in the room 7 where air cleanliness is ensured to collect trace amounts of smoke, and the first ultra-sensitive smoke detection device 3 is configured to detect trace amounts of smoke present in the air collected by the pipe 33.

This allows the room 7, where air cleanliness is ensured, to be large, and allows even trace amounts of smoke from the entire large room 7 to be sent to the first ultra-high sensitivity smoke detection device 3 without omission or delay, thereby preventing serious accidents from occurring in the large room 7, where air cleanliness is ensured.

The fire monitoring system 1 also includes a portable second ultra-high sensitivity smoke detector 43 for identifying the source of a small amount of smoke in a room 7 where air cleanliness is ensured when the first ultra-high sensitivity smoke detector 3 emits a first alarm signal.

This allows the portable second ultra-sensitive smoke detector 43 to be moved to reliably identify the source of even the smallest amounts of smoke, further reliably preventing serious accidents from occurring in the room 7 where air cleanliness is ensured.

Furthermore, if a portable second ultra-sensitive smoke detector 43 is not installed, the generation of even a small amount of smoke will be detected only by the display on the monitoring device 5 installed in the security guard room, for example. This may result in the inability to quickly identify the source of the small amount of smoke, which may delay the implementation of countermeasures.

Furthermore, in the fire monitoring system 1, at least one of the first ultra-high sensitivity smoke detection device 3 and the second ultra-high sensitivity smoke detection device 43 is configured to be able to distinguish between smoke and dust. This means that an alarm signal is emitted only when a trace amount of smoke is generated, thereby reducing the generation of unnecessary alarm signals. Note that the ultra-high sensitivity smoke detection devices 3 and 43 may be configured to emit a different type of alarm signal when they detect the generation of a trace amount of dust than when they detect the generation of a trace amount of smoke.

The fire monitoring method also includes a detection stage, a reporting stage, a first instruction stage, an identification stage, a notification stage, a second instruction stage, and an execution stage. This allows appropriate action to be taken quickly at the direction of the person in charge when even a small amount of smoke is generated in a room 7 where air cleanliness is ensured. This also minimizes damage to smoke generation warning devices 35 and the like installed in the room 7 where air cleanliness is ensured, and prevents serious accidents from occurring in the room 7 where air cleanliness is ensured.

Furthermore, in the fire monitoring method, when a trace amount of smoke is detected in the first detection stage, the fact that a trace amount of smoke has been detected is transmitted not only to the person in charge of the room 7 where air cleanliness is ensured, but also to the monitor 45.

This allows ample time to prepare for identifying the source of minute amounts of smoke using the portable second ultra-sensitive smoke detector 43, enabling the source of minute amounts of smoke to be identified more quickly.

By the way, the following methods may be used as fire monitoring methods.

In other words, the following fire monitoring method may be adopted, which has a detection stage, a reporting stage, an identification stage, a notification stage, an instruction stage, and an execution stage.

The detection stage is a stage in which a first ultra-sensitive smoke detection device 3 installed in a predetermined location is used to detect the generation of even trace amounts of smoke in a location 7 where air cleanliness is ensured.

The reporting stage is a stage in which, when a trace amount of smoke is detected during the detection stage, a report is sent to a monitor 45 at a location 7 where air cleanliness is ensured, to notify the monitor 45. This report is sent by the first ultra-high sensitivity smoke detection device 3 via the network 31 and an information terminal 29 connected to this network 31.

In addition, during the above-mentioned reporting stage, the fact that a small amount of smoke has been detected may be reported to the person in charge in addition to the monitor 45 at the location 7 where air cleanliness is ensured. In this case, the reporting is also done via the first ultra-high sensitivity smoke detection device 3, the network 31, and the information terminal 29 connected to this network 31.

The identification stage is a stage in which, when a report is transmitted in the report transmission stage, a monitor 45 uses a portable second ultra-sensitive smoke detection device 43 to identify the source of a small amount of smoke in a location 7 where air cleanliness is ensured.

The notification stage is a stage in which, when the source of the slight amount of smoke is identified in the identification stage, the monitor 45 notifies the person in charge of the source of the slight amount of smoke via the network 31 and the information terminal 29 connected to this network 31. The monitor 45 notifies the person in charge of the source of the slight amount of smoke via the network 31 and the information terminal 29 connected to this network 31, and asks for instructions from the person in charge.

The instruction stage is a stage in which, when a notification of a trace smoke source is received in the notification stage, the person in charge instructs the monitor 45 via the network 31 and the information terminal 29 connected to this network 31 on how to respond at the location 7 where air cleanliness is ensured. The response method is a method for dealing with the generation of trace smoke at the trace smoke source.

The execution stage is the stage in which the monitor 45 carries out the response method when a response measure is instructed in the second instruction stage.

In the above description, the first ultra-sensitive smoke detector 3 and the second ultra-sensitive smoke detector 43 are designed to detect smoke and dust, but the ultra-sensitive smoke detectors 3 and 43 may also be composite sensors capable of detecting _O2 , _CO2 , CO, etc.

Smell sensors can also be used to search for the source of smoke or other issues on-site. Smell sensors use AI to automatically detect fires in IT equipment such as servers, cables, circuit boards, etc. in data centers.

Furthermore, if a source of fire or a suspicious location is identified on-site, inert gases such as _CO2 , _N2 , or IG541 may be used to suppress or prevent a fire. The network 31 may be a dedicated transmission line, Wi-Fi, or a public line.

The above description concerns the generation of a small amount of smoke in a location 7 where air cleanliness is ensured, but the fire monitoring system 1 may also be understood as a failure monitoring system 1 for monitoring for failures in the first ultra-high sensitivity smoke detection device 3, etc.

This section explains what happens when a malfunction occurs in the first ultra-sensitive smoke detector 3 in the malfunction monitoring system 1. The malfunction monitoring system 1 is composed of the ultra-sensitive smoke detector 3 and the monitoring device 5. The ultra-sensitive smoke detector 3 detects the generation of minute amounts of smoke in a location 7 where air cleanliness is ensured, and emits a first malfunction signal when a malfunction occurs.

The monitoring device 5 receives the first fault occurrence signal from the ultra-high sensitivity smoke detection device 3 via the first network 65 (see Figures 11 and 13). Upon receiving this signal, the monitoring device 5 sends a notification to the terminal 29 via the second network 67 (see Figures 11 and 13) that a fault (malfunction) has occurred in the ultra-high sensitivity smoke detection device 3. The terminal 29 may be, for example, a mobile terminal of the person in charge of the location 7 where air cleanliness is ensured. Furthermore, upon receiving the first fault occurrence signal, the monitoring device 5 outputs a signal indicating the occurrence of a fault using light, sound, or the like.

Failures of the ultra-high sensitivity smoke detection device 3 (failures that will cause the first failure occurrence signal to be generated) include failure of the photodiode 17 (see Figure 10) itself, failure of the control board 61 (see Figure 15) for the photodiode 17, and failure of the laser light source 13 (see Figure 10).

To explain further, suppose that when the laser light source 13 emits laser light 23, the difference between the detection value of one of the three photodiodes 17 and the detection values of the other two diodes is greater than a predetermined threshold. In this case, it is determined that a failure has occurred in the photodiode 17 itself or in the control board 61 of the photodiode 17, and a first failure occurrence signal is emitted. Furthermore, if the photodiode 17 does not detect scattered light even though the laser light source 13 emits laser light 23, it is determined that a failure has occurred in the laser light source 13, and a first failure occurrence signal is emitted. It is desirable that the form of the first failure occurrence signal differ depending on the type of failure.

The fault monitoring system 1 receives a first fault occurrence signal from the ultra-high sensitivity smoke detection device 3 via the first network 65. At this time, the monitoring device 5 sends a notification that a fault has occurred in the ultra-high sensitivity smoke detection device 3 to a terminal 29 (a mobile terminal of the person in charge of the location where air cleanliness is ensured) via the second network 67.

This makes it clear how to respond when a malfunction occurs in the ultra-sensitive smoke detection device 1, preventing serious accidents from occurring.

In the fault monitoring system 1, the ultra-high sensitivity smoke detection device 3 sends a signal to the monitoring device 5 at predetermined time intervals to check whether any abnormalities have occurred on the first network 65. In other words, the monitoring device 5 receives a fault occurrence signal from the ultra-high sensitivity smoke detection device 3 via the first network 65.

When the monitoring device 5 cannot receive a signal to check whether an abnormality has occurred, it sends a notification that a failure has occurred in the first network 65 (a notification that an abnormality has occurred in the network 65) to a terminal 29 (for example, a mobile terminal of a person in charge of the location 7 where air cleanliness is ensured).

An example will be given. The ultra-high sensitivity smoke detection device 3 sends a signal to the monitoring device 5 via the first network 65 every 10 minutes to check whether any abnormalities have occurred on the first network 65. If the monitoring device 5 does not receive a signal to check whether a new abnormality has occurred even after 10 minutes have passed since receiving the signal to check whether any abnormalities have occurred, the monitoring device 5 sends a notification to the terminal 29 that a failure has occurred on the first network 65.

In the fault monitoring system 1, when a signal for checking whether an abnormality has occurred cannot be received, the monitoring device 5 sends a notification to the terminal 29 that a fault has occurred on the first network 65. This clarifies how to respond when a fault occurs on the first network 65, and makes it possible to prevent serious accidents from occurring.

Fault monitoring system 1 can also be the following. This fault monitoring system 1 is configured with an ultra-sensitive smoke detector 3, a flow rate detector 63 (see Figure 15), and a monitoring device 5. The ultra-sensitive smoke detector 3 detects the generation of even small amounts of smoke in a location 7 where cleanliness is ensured.

A pipe 33 extends from the ultra-sensitive smoke detector 3. The pipe 33 is installed in the area 7 where air cleanliness is ensured in order to collect trace amounts of smoke in the area 7 where air cleanliness is ensured and send it to the ultra-sensitive smoke detector 3 (see Figures 7 and 8).

The ultra-sensitive smoke detector 3 is provided with a suction section 15 (see Figures 9 and 15) that sucks in air from the piping 33. This suction section 15 allows air from the area 7, where air cleanliness is ensured (air containing or not containing traces of smoke), to flow through the piping 33 to the ultra-sensitive smoke detector 3.

The flow rate detection device 63 (see Figure 15) detects the flow rate of air flowing through the pipe 33, and issues a second fault occurrence signal when the detected flow rate falls outside a predetermined range. The detected flow rate falls outside the predetermined range when the air flow rate does not fall within the predetermined range. More specifically, this occurs when the air flow rate is less than a predetermined first threshold value or greater than a predetermined second threshold value. Note that the predetermined first threshold value is less than the predetermined second threshold value.

The flow rate detector 63 is provided, for example, in the ultra-high sensitivity smoke detector 3, but it may also be provided in a location different from the ultra-high sensitivity smoke detector 3. For example, it may be provided in the middle of the piping 33, near the ultra-high sensitivity smoke detector 3.

Moreover, multiple flow rate detection devices 63 (three in Figure 15) are provided. Any one of the multiple flow rate detection devices 63 (63A, 63B, 63C) detects the flow rate of air flowing through the piping.

More specifically, flow rate detection device 63A detects the flow rate of air flowing through pipe 33A. Flow rate detection device 63B detects the flow rate of air flowing through pipe 33B. Flow rate detection device 63C detects the flow rate of air flowing through pipe 33C. Switching valves (not shown) are provided midway through each of pipes 33A, 33B, and 33C (at locations near flow rate detection device 63).

By appropriately switching the multiple switching valves, air flows through one of the pipes 33A, 33B, or 33C, and one of the flow rate detection devices 63 (63A, 63B, or 63C) can detect the flow rate. The multiple switching valves are switched at predetermined time intervals, and the flow rate detection devices 63A, 63B, and 63C sequentially detect the air flow rate as time passes. For example, from 12:00 to 12:02, only flow rate detection device 63A detects the flow rate; from 12:02 to 12:04, only flow rate detection device 63B detects the flow rate; and from 12:04 to 12:06, only flow rate detection device 63C detects the flow rate. This operation is repeated.

The monitoring device 5 receives the second fault occurrence signal from the flow rate detection device 63 via the third network 69. At this time, a notification that a fault has occurred in the piping 33 (a notification that a problem has occurred in the piping 33) is sent via the fourth network 71 to the terminal 29 (for example, a mobile terminal of the person in charge of the location where air cleanliness is ensured).

Faults in the pipe 33 (faults that will cause the second fault occurrence signal to be generated) include a bent pipe 33, a loose or disconnected pipe 33, or a clogged pipe 33.

If the flow rate value detected by the flow rate detection device 63 is smaller than a predetermined first threshold, it is determined that the piping 33 is bent or clogged, and a second fault occurrence signal is emitted. If the flow rate value detected by the flow rate detection device 63 is smaller than a predetermined second threshold, it is determined that the piping 33 has come loose or become disconnected, and a second fault occurrence signal is emitted. Here, the form of the second fault occurrence signal when the flow rate value is larger than the predetermined second threshold may be different from the form of the second fault occurrence signal when the flow rate value is smaller than the predetermined first threshold.

In the fault monitoring system 1, when a second fault occurrence signal is received from the flow detection device 63 via the third network 69, the monitoring device 5 sends a notification to the terminal 29 via the fourth network 71 that a fault has occurred in the piping 33.

This will clarify how to respond if a malfunction occurs in the piping 33, preventing serious accidents from occurring.

In addition, the fault monitoring system 1 that notifies of a fault in the pipe 33 may be configured to send a notification to the terminal 29 that a fault has occurred in the first network 65.

Here, the description of the fault monitoring system 1, etc., for monitoring the occurrence of a fault, may be understood as the fault monitoring method described below.

This fault monitoring method comprises a detection stage (fault detection stage), a first notification stage, a first instruction stage, an investigation stage, a second notification stage, a second instruction stage, and an execution stage.

During the detection stage, the ultra-sensitive smoke detector 3, which detects even the slightest amount of smoke in a location 7 where air cleanliness is ensured, detects any malfunction in its smoke detection function by itself.

In the first notification stage, the ultra-high sensitivity smoke detection device 3 notifies the person in charge of the location 7 where air cleanliness is ensured that a malfunction has been detected via the monitoring device 5, network 31, and first terminal 29 (e.g., the person in charge's mobile terminal).

When a notification is made at the first notification stage, the person in charge instructs the monitor at the location 7 where air cleanliness is ensured to investigate the malfunction in detail via the first terminal, network 31, and first terminal (e.g., the monitor's mobile terminal) 29.

In the investigation stage, upon receiving the instruction in the first instruction stage, the monitor operates the first ultra-high sensitivity smoke detection device 3 to investigate the details of the malfunction in the first ultra-high sensitivity smoke detection device 3.

In the second notification stage, when the cause or details of the failure in the first ultra-high sensitivity smoke detection device 3 are determined during the investigation stage, or when the cause or details of the failure in the first ultra-high sensitivity smoke detection device 3 are not determined during the investigation stage, the monitor notifies the responsible person. This notification is made via the second terminal, network 31, and first terminal.

In the second instruction stage, when notified in the second notification stage, the person in charge instructs the monitor on how to deal with the failure of the first ultra-high sensitivity smoke detection device 3 via the first terminal, network, and second terminal. In the execution stage, when the monitor is instructed on how to deal with the failure in the second instruction stage, he or she carries out the method of action.

As described above, the fault monitoring method comprises a fault detection stage, a first notification stage, a first instruction stage, an investigation stage, a second notification stage, a second instruction stage, and an execution stage.

This allows the manager to know the details or cause of any malfunctions in the smoke detection function of the ultra-high sensitivity smoke detector 3, and to instruct the monitor on the appropriate countermeasures, allowing the monitor to take appropriate action. This in turn makes it possible to prevent serious accidents from occurring.

Furthermore, the description regarding the fault monitoring system 1, etc., for monitoring the occurrence of a fault, may also be understood as the fault monitoring method described below.

This fault monitoring method comprises a first notification stage, a first instruction stage, an investigation stage, a second notification stage, a second instruction stage, and an execution stage.

In the first notification stage, the flow rate detector 63 detects the flow rate of air flowing through the pipe 33, which collects air from the area 7 where air cleanliness is ensured and sends it to the ultra-high sensitivity smoke detector 3, which detects the generation of even the smallest amounts of smoke. When this detected flow rate falls outside a predetermined range, the flow rate detector 63 notifies the person in charge of the area 7 where air cleanliness is ensured that a fault has been detected in the pipe 33. This notification is made via the monitoring device 5, the network, and a first terminal (e.g., the person in charge's mobile terminal) 29.

In the first instruction stage, when a notification is made in the notification stage 1, the person in charge instructs the monitor at location 7 where air cleanliness is ensured to investigate the malfunction in detail via the first terminal, the network, and a second terminal (for example, the monitor's mobile terminal).

In the investigation stage, when instructions are received in the first instruction stage, the monitor investigates the details of the failure in pipe 33. In the second notification stage, when the cause or details of the failure in pipe 33 are determined in the investigation stage, or when the cause or details of the failure in pipe 33 are not determined in the investigation stage, the monitor notifies the responsible person. This notification is made via the second terminal, the network, and the first terminal.

In the second instruction stage, when notified in the second notification stage, the person in charge instructs the monitor on how to deal with the failure in pipe 33 via the first terminal, network, and second terminal. In the execution stage, when the monitor is instructed on the method of dealing with the failure in pipe 33 in the second instruction stage, the monitor executes the method of dealing with the failure.

As described above, the fault monitoring method comprises a first notification stage, a first instruction stage, an investigation stage, a second notification stage, a second instruction stage, and an execution stage.

This allows the manager to know the details or cause of the problem in the piping, instruct the supervisor on the appropriate countermeasures, and the supervisor can then take appropriate action. This in turn makes it possible to prevent serious accidents from occurring.

The above-mentioned fault monitoring can also be further enhanced as follows:

In other words, the ultra-sensitive smoke detection device 3 may be configured to send a notification in the first notification stage via the network and the monitoring device. The ultra-sensitive smoke detection device 3 may be configured to send a signal to the monitoring device at predetermined time intervals to check whether an abnormality has occurred on the network.

The monitoring device 5 may also be configured to receive a fault signal from the ultra-high sensitivity smoke detection device 3 via the network. When the monitoring device 5 is unable to receive a signal to check for any abnormalities in the network (the network connecting the ultra-high sensitivity smoke detection device 3 and the monitoring device 5), it notifies the user that a fault has occurred in the network. This notification may be sent to the terminal 29 of the person in charge of the location 7 where air cleanliness is ensured.

The present embodiment has been described above, but it is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment.

1. Failure monitoring system 3. Ultra-high sensitivity smoke detection device 5. Monitoring device 7. Air cleanliness guaranteed location 29. Terminal (PC or mobile terminal)
33 Piping 63 Flow rate detection device 65 First network 67 Second network 69 Third network 71 Fourth network

Claims (4)

An ultra-sensitive smoke detector that detects even the slightest amount of smoke in places where air cleanliness is ensured,
A pipe for collecting a small amount of smoke in the place where the air cleanliness is ensured and sending it to the ultra-high sensitivity smoke detection device;
a flow rate detection device that detects the flow rate of air flowing through the piping and issues a second fault occurrence signal when the detected flow rate falls outside a predetermined range;
a monitoring device that, when receiving a second fault occurrence signal from the flow rate detection device via a third network, sends a notification that a fault has occurred in the piping to a terminal via a fourth network;
and
A plurality of the pipes extend from the ultra-high sensitivity smoke detection device,
a plurality of the flow rate detection devices are provided, and each of the plurality of flow rate detection devices is configured to detect the flow rate of air flowing through each of the plurality of pipes;
A fault monitoring system in which a switching valve is provided in each of the plurality of pipes, and air is allowed to flow through any one of the plurality of pipes by switching these switching valves . the flow rate detection device is configured to send a signal to the monitoring device at predetermined time intervals to check whether or not an abnormality has occurred in the third network;
The fault monitoring system of claim 1, wherein the monitoring device is configured to send a notification to the terminal that a fault has occurred in the third network when it is unable to receive a signal for checking whether or not the abnormality has occurred. the monitoring device is configured to, when receiving a first fault occurrence signal from the ultra-high sensitivity smoke detection device via a first network, send a notification that a fault has occurred in the ultra-high sensitivity smoke detection device to a terminal via a second network;
The fault monitoring system described in claim 1, wherein the ultra-high sensitivity smoke detection device comprises a laser light source that emits laser light, three photodiodes that detect light generated when the laser light emitted by the laser light source hits smoke or dust and is scattered, and a control board for these three photodiodes . the ultra-high sensitivity smoke detection device is configured to send a signal to the monitoring device at predetermined time intervals to check whether or not an abnormality has occurred in the first network;
The fault monitoring system according to claim 3, wherein the monitoring device is configured to send a notification to the terminal that a fault has occurred in the first network when it is unable to receive a signal for checking whether or not the abnormality has occurred.