JP5085979B2 - Gas leak alarm and gas leak alarm system - Google Patents

Description

  The present invention relates to a gas leak alarm and a gas leak alarm system including the gas leak alarm.

  In a gas leak alarm system including a gas meter and a gas leak alarm, when a gas leak is detected by the gas leak alarm, a shutoff signal is transmitted from the gas leak alarm to the gas meter, and when the gas meter receives the shutoff signal, Close the built-in shut-off valve to shut off the gas. This interruption signal is transmitted, for example, in the form of a no-voltage signal that is repeatedly turned on for 5 seconds and turned off for 5 seconds.

  Further, the gas meter outputs various signals representing the operation state of the gas meter from an alarm terminal which is one of the external output terminals to the gas leak alarm. Various signals representing the operating state of the gas meter are transmitted in a non-voltage signal format having different ON / OFF repeated forms, for example, as shown in FIG.

  In FIG. 6, (a) the shut-off notice signal is a signal that outputs a signal with a 5-second cycle of 0.1 seconds on and 4.9 seconds off twice, and (b) the valve shut-off signal is on for 0.1 seconds. , 0.3 seconds off, 0.1 seconds on, 9.5 seconds off, and a 10-second cycle signal. (C) The return safety confirmation signal is 0.1 seconds on, 0.1 seconds off, 0. 1 second on, 0.1 second off, 0.1 second on, 4.5 second off, 5 second period signal. (D) Gas use permission signal is 0.5 second on, 4.5 second off. (E) The pre-pay warning signal is a signal that outputs a signal having a 5-second cycle of 0.1 second on and 4.9 seconds off three times.

  The gas leak alarm device receives a signal transmitted from the gas meter, identifies which signal is in a repeated form of ON and OFF, and notifies it by voice or LED display.

On the other hand, as a gas leak alarm system provided with a gas meter and a gas leak alarm device, for example, there is one proposed by the applicant. In this gas leak alarm system, the gas meter detects the use of gas equipment based on the detected gas flow rate, and sends usage information according to the detection result to the gas leak alarm device via the terminal block. To do. Based on the received usage information, the gas leakage alarm device determines whether or not the gas device is currently used, and performs a gas usage notification while it is determined that the gas device is being used (see Patent Document 1). ).
JP 2004-19956 A

  However, in the gas leak alarm system described in the above-mentioned Patent Document 1, the gas appliance use information signal transmitted through the terminal block is a code signal, and is not a repeated on / off signal format. On the device side, the circuit for identifying various signals shown in FIG. 7 cannot be used for identification, and a separate identification circuit is required, which increases the cost.

  In addition, the gas leak alarm is always energized even when the gas appliance usage information signal is not received, even when the gas appliance is not in use, and is in a standby state for detecting gas leaks, resulting in a large power consumption. There is.

  In view of the above-described problems, an object of the present invention is to provide a gas leak alarm device and a gas leak alarm system that can save power and can inform the use status of gas appliances with an inexpensive configuration.

  In order to solve the above-mentioned problems, the gas leak alarm device according to claim 1 has a gas sensor for detecting a gas leak in a monitoring region, and an alarm means for notifying an alarm when the gas leak occurs. A gas leak alarm connected to the gas meter in a communicable manner, receiving means for receiving a gas appliance discrimination signal transmitted from the gas meter, and determining whether or not the gas appliance discrimination signal is received by the receiving means Reception determination means, first storage means for storing a gas appliance identification table for identifying a gas appliance installed in the gas leakage monitoring area, and the reception determination means receiving the gas appliance discrimination signal When it is determined that the gas appliance corresponding to the gas appliance discrimination signal is leaked with reference to the gas appliance identification table stored in the first storage means. Gas appliance determination means for determining whether or not the gas appliance is installed in the viewing area, and a gas appliance corresponding to the gas appliance discrimination signal by the gas appliance determination means is installed in the gas leakage monitoring area. And a sensor drive control means for driving the gas sensor when it is determined that the gas appliance is a gas appliance.

  According to the first aspect of the present invention, a gas leak alarm device having a gas sensor for detecting a gas leak in the monitoring region and an alarm means for notifying an alarm when the gas leak occurs and is communicably connected to the gas meter. Includes a receiving means for receiving a gas appliance discrimination signal transmitted from the gas meter, a reception determining means for judging whether or not the gas appliance discrimination signal is received in the receiving means, and a gas appliance installed in the gas leakage monitoring area And a gas appliance identification table stored in the first storage means when the reception determination means determines that the gas appliance identification signal is received. The gas appliance determination means for determining whether or not the gas appliance corresponding to the gas appliance discrimination signal is a gas appliance installed in the gas leakage monitoring area, When the gas appliance corresponding to the gas appliance determination signal device determination means determines that the gas appliance which is installed within the monitoring area of the gas leak, and a sensor drive control means for driving the gas sensor. Thereby, since the sensor is driven only when the gas appliance in the monitoring area is used, power consumption can be reduced.

  In order to solve the above-mentioned problem, the invention according to claim 2 is the gas leak alarm device according to claim 1, wherein when the reception determination means determines that the gas appliance determination signal is received, the gas appliance is used. It is further characterized by further comprising an informing means for informing inside.

  In a second aspect of the present invention, the gas leak alarm device further includes notification means for performing notification that the gas appliance is in use when it is determined by the reception determination means that the gas appliance discrimination signal has been received. Thereby, it is possible to notify the user that the gas is being used regardless of the inside or outside of the monitoring area. Therefore, the user can grasp whether or not the gas is being used by looking at the gas leak alarm when going out, and can take measures such as closing the gas stopper.

A gas leak alarm system according to a third aspect of the present invention , which has been made to solve the above-mentioned problems, includes the gas leak alarm device according to the first or second aspect, and a gas flow rate detection unit for detecting the flow rate of gas flowing to the gas appliance A second storage means for storing a gas appliance use determination table representing a correspondence relationship between a type of the gas appliance and a flow rate category to which a gas flow rate consumed during use of the gas appliance belongs, and the gas flow rate detection A gas appliance discriminating means for discriminating the gas appliance in use by referring to the gas appliance usage discrimination table stored in the second storage means on the basis of the gas flow rate detected by the unit; And a gas meter having a transmission means for transmitting a gas appliance discrimination signal corresponding to the discrimination result in the discrimination means.

In invention of Claim 3, it consists of a gas leak alarm device of Claim 1 or 2, and a gas meter. The gas meter has a gas appliance use discrimination table that indicates the correspondence between the gas flow rate detection unit that detects the flow rate of gas flowing to the gas appliance, and the flow rate category to which the gas flow rate consumed during use of the gas appliance belongs. Based on the stored second storage means and the gas flow rate detected by the gas flow rate detector, the gas appliance in use is referred to by referring to the gas appliance use determination table stored in the second storage means. Gas appliance discrimination means for discrimination, and transmission means for transmitting a gas appliance discrimination signal corresponding to the discrimination result in the gas appliance discrimination means. Thereby, since the sensor is driven only when the gas appliance in the monitoring area is used, it is possible to realize a gas leak alarm system that can reduce power consumption.

In order to solve the above-mentioned problem, the invention according to claim 4 is the gas leak alarm system according to claim 3, wherein the gas meter also transmits a signal indicating an operation state of the gas meter to the gas leak alarm device. Both of the gas appliance discrimination signal and the signal indicating the operating state of the gas meter are pulse signals having different ON / OFF repetitive forms.

In the invention according to claim 4, the gas meter also transmits a signal indicating the operation state of the gas meter to the gas leak alarm, and both the gas appliance discrimination signal and the signal indicating the operation state of the gas meter are repeatedly turned on and off. The pulse signals have different forms. Thereby, the gas appliance in use can be discriminated based on the reception of the gas appliance discriminating signal with the same configuration as before, and can be realized with an inexpensive configuration.

  According to the first aspect of the present invention, since the sensor is driven only when the gas appliance in the monitoring area is used, it is possible to realize a gas leak alarm capable of reducing power consumption.

  According to invention of Claim 2, it can alert | report to a user that gas is used regardless of the monitoring area | region inside and outside.

According to the invention described in claim 3, since the sensor is driven only when the gas appliance in the monitoring area is used, it is possible to realize a gas leak alarm system capable of reducing power consumption.

  According to the fourth aspect of the present invention, the gas appliance in use can be discriminated based on the reception of the gas appliance discriminating signal with the same configuration as before, and can be realized with an inexpensive configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a gas leak alarm system provided with a gas leak alarm device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing details of a communication interface in the gas leak alarm system of FIG. It is.

  The gas leak alarm system includes a gas meter 1 and a gas leak alarm device 2 connected to the gas meter 1 via a signal line L.

  The gas meter 1 is supplied via a gas supply pipe 3 to gas appliances 4 such as a gas stove 4a, a gas stove 4b, and a hot water heater 4c installed outside the house H. This is for integrating and measuring the amount of gas to be accumulated and displaying it as the amount of accumulated gas used. The gas meter 1 is obtained by measuring and measuring the instantaneous gas flow rate based on the gas flow rate detection unit 11 provided in the gas flow path of the gas supply pipe 3 and the flow rate detection signal from the gas flow rate detection unit 11. A gas meter control unit 13 that performs a metering process for integrating and measuring the instantaneous gas flow rate value and displaying it on the display unit 12;

  The gas meter control unit 13 is realized by, for example, a microcomputer in which a control program is installed, and includes a CPU 13a that executes the control program, a ROM 13b that stores the control program and data, and a RAM 13c that temporarily stores data. Accordingly, the battery 14 is connected to the gas meter controller 13 as an operating power source. Furthermore, the gas meter 1 has a communication interface 15 that communicates with the gas leak alarm 2 via a signal line. In addition, the gas meter 1 is provided with various sensors and actuators in addition to the above, but since they are not directly related to the present invention, they are not shown here and the description thereof is omitted.

  The gas flow rate detector 11 sends ultrasonic waves bidirectionally along the gas flow path, detects the gas flow rate from each propagation time, and outputs an instantaneous gas flow rate signal from the relationship with the cross-sectional area of the gas flow path. It is an ultrasonic flow rate measuring means.

  The gas meter control unit 13 determines whether or not the gas appliance 4 such as the gas stove 4a, the gas stove 4b, and the water heater 4c is used in addition to the above-described gas flow rate metering process. Gas appliance discrimination processing is performed in which a gas appliance discrimination signal representing the inside is sent from the communication interface 15 to the gas leak alarm device 2 via the signal line L. The gas appliance identification signal includes a cutoff notice signal, a valve cutoff signal, a return safety confirmation signal, a gas use permission signal, and the like transmitted and received for other functions between the gas meter 1 and the gas leak alarm 2 (see FIG. 6). ) In the same signal format.

  For example, when the gas appliance 4 is used, the gas flow rate value flowing through the gas flow path during the combustion of the gas appliance 4 is detected and detected by the gas flow rate detection unit 11. The gas flow rate value is determined by determining which one of the flow rate segments divided into a plurality of flow rate ranges from a predetermined small flow rate to a large flow rate. In order to use for this determination, the gas stove 4a, the gas stove 4b as gas appliances installed in the monitoring area of the gas leak alarm device 2, that is, the same room (for example, kitchen) as the gas leak alarm device 2, and the gas leak alarm Of the gas appliance 4 such as the water heater 4c as a gas appliance installed outside the monitoring area of the appliance 2, that is, not in the same room as the gas leak alarm 2, and the gas flow rate consumed by the gas appliance 4 during combustion A gas appliance use determination table showing a correspondence relationship with the flow rate classification to which the gas meter belongs is stored in advance in a ROM 13b as an electrically rewritable storage means in the gas meter control unit 13. This gas appliance use determination table is stored in the ROM 13b using a setting device or the like when the gas meter 1 is installed.

  As the flow rate classification, for example, the flow rate classification used for the use time cutoff function is also used. This flow rate is divided into a flow rate category of 21 (l (liters) / h (hours)), a flow rate category 2-1 of 21 l / h or more and less than 63 l / h, a flow rate category 2 of 63 l / h or more and less than 125 l / h. -2, divided into 15 flow rate segments such as a flow rate segment 2-3 of 125 l / h or more and less than 210 l / h, a flow rate segment 3 of 210 l / h or more and less than 250 l / h, ..., a flow rate segment 13 of 1460 l / h or more It has been.

  The CPU 13a corresponds to the gas appliance discrimination means in the claims, the ROM 13b corresponds to the second storage means in the claims, and the communication interface 15 corresponds to the transmission means in the claims.

  The gas leak alarm 2 is installed in the kitchen (monitoring area) in the house H where the gas stove 4a and the gas stove 4b are installed, and the gas concentration in the atmosphere exceeds a predetermined threshold value. Is detected, a gas leak is determined and a warning is issued to notify the gas leak. The gas leak alarm 2 includes a communication interface 21 that communicates with the gas meter 1 via a signal line, an alarm unit 22, a control unit 23, a gas sensor 24, and a sensor drive control unit 25.

  The control unit 23 is realized by, for example, a microcomputer in which a control program is installed, and includes a CPU 23a that executes the control program, a ROM 23b that stores the control program and data, and a RAM 23c that temporarily stores data. The control unit 23 performs gas leak detection at a predetermined detection timing. When the gas concentration in the atmosphere detected by the gas sensor 24 is equal to or higher than a predetermined threshold value, the control unit 23 determines that there is a gas leak, and an alarm unit. The gas leak notification is performed from 22. Although not shown, the alarm unit 22 includes an LED that performs alarm display by blinking display, a buzzer or a speaker that generates an alarm sound, and the like.

  In addition, the control unit 23 determines whether or not the gas appliance determination signal sent from the gas meter 1 is received via the signal line L and the communication interface 21, and when the gas appliance determination signal is received, The alarm unit 22 informs that it is in use by LED display or voice. Further, the control unit 23 determines whether the gas appliance in use is a gas appliance that falls within the monitoring area of the gas leak alarm 2. In order to use for this determination, a gas appliance table indicating the type of gas appliance installed in the monitoring area of the gas leak alarm device 2, that is, the same room (for example, kitchen) as the gas leak alarm device 2 is provided in the control unit 23. Is stored in advance in a ROM 23b as an electrically rewritable storage means. This gas appliance table is stored in the ROM 23b using a setting device or the like when the gas leak alarm device 2 is installed.

  When the control unit 23 determines that the gas appliance is within the monitoring area, the control unit 23 drives the gas sensor 24 to monitor the gas leak. When the gas leak is detected in this monitoring state, the control unit 23 issues a gas leak alarm from the alarm unit 22. Generate a gas leak to the user.

  As shown in FIG. 2, the communication interface 15 of the gas meter 1 is connected to a power source, and is connected to the switch 151 controlled by a control signal output from the output port O1 of the CPU 13a of the gas meter control unit 13, and to the power source. A switch 152 controlled by a control signal output from the output port O2 of the CPU 13a of the control unit 13, an impedance element 153 connected between the switch 151 and the ground, and an impedance element 154 connected between the switch 152 and the ground It is composed of The connection point of the switch 151 and the impedance element 153 is connected to the alarm device connection terminal T11 included in the terminal block and the input port I1 of the CPU 13a.

  The communication interface 21 of the gas leak alarm 2 includes a photocoupler 211 composed of a light emitting diode 211a and a phototransistor 211b having an anode connected to a meter connection terminal T21 included in the terminal block and a cathode connected to T22, and an anode connected to a power source. Is connected to the output port O11 of the CPU 23a of the control unit 23, and a photocoupler 212 including a phototransistor 212b. The collector of the phototransistor 211b of the photocoupler 211 is connected to the power supply via the resistor 213, and is connected to the input port I11 of the CPU 23a, and the emitter is grounded. The collector of the phototransistor 212b of the photocoupler 212 is connected to a meter connection terminal T22 included in the terminal block, and the emitter is connected to a meter connection terminal T21 included in the terminal block.

  The alarm connection terminals T11 and T12 of the gas meter 1 are connected to the meter connection terminals T21 and T22 of the gas leak alarm 2 via signal lines L1 and L2, respectively.

  The CPU 23a corresponds to the reception determination means and the gas appliance determination means in the claims, the ROM 23b corresponds to the first storage means in the claims, the communication interface 21 corresponds to the reception means in the claims, and the sensor drive control unit 25 It corresponds to the sensor drive control means in the claims, and the alarm unit 22 corresponds to the alarm means and the notification means in the claims.

  Next, the gas appliance determination process performed by the CPU 13a in accordance with the control program stored in the ROM 13b in the gas meter control unit 13 of the gas meter 1 will be described with reference to the flowchart of FIG.

  The CPU 13a of the gas meter control unit 13 starts its operation when a power supply (not shown) is turned on, and measures an instantaneous gas flow rate based on a flow rate detection signal from the gas flow rate detection unit 11 at a predetermined measurement timing (step S1). Next, the flow rate classification of the measured gas flow value is detected (step S3). Next, a gas appliance corresponding to the detected flow rate classification is determined (step S5). This determination is made by referring to the gas appliance use determination table stored in advance in the ROM 13b, if the detected flow rate classification corresponds to any one of the gas stove 4a, gas stove 4b, or hot water heater 4c. The gas stove 4a, the gas stove 4b or the gas appliance 4 of the water heater 4c is determined to be in use.

  Next, a gas appliance discrimination signal corresponding to the discriminated gas appliance is transmitted to the gas leak alarm 2 via the communication interface 15 and the signal line L (step S7), and then the process returns to step S1.

  For example, as shown in FIG. 4 (A), the transmitted gas appliance discrimination signal has a different number of on-pulses of an on-off signal with a period of 5 seconds different from the signals shown in FIG. As an example, when the gas appliance determined in step S5 is the gas stove 4a, the continuous number of on-pulses is set to four times, the gas stove 4b is set to five times, and the hot water heater 4c is set to six times.

  Specifically, for example, when the gas appliance determined in step S5 is the gas stove 4a, in FIG. 2, the switch 151 is continuously set at 0.1 second intervals by outputting a control signal from the output port O1 of the CPU 13a. Repeatedly turning on and off four times at intervals of 5 seconds. Thereby, while the switch 151 is on, the power source is connected to the ground via the switch 151, the alarm connection terminal T11, the signal line L1, the meter connection terminal T21, the light emitting diode 211a, the alarm connection terminal T22, and the impedance element 153. When the current flows, the light emitting diode 211a is turned on, and the phototransistor 211b is turned on, whereby the gas appliance discrimination signal shown in FIG. 4A is input to the input port I11 of the CPU 23a.

  In FIG. 2, the signal transmitted from the gas leak alarm 2 to the gas meter 1 turns on and off the light emitting diode 212a of the photocoupler 212 by outputting a control signal from the output port O11 of the CPU 23a of the gas meter 1. Thus, the phototransistor 212b is turned on and off, and is input to the input port I1 of the CPU 13a of the gas meter 1 through the gas meter connection terminals T21 and T22 and the gas leak alarm connection terminals T11 and T12.

  Next, the gas leak detection process performed by the CPU 23a in accordance with the control program stored in the ROM 23b in the control unit 23 of the gas leak alarm device 2 will be described with reference to the flowchart of FIG.

  The CPU 23a of the control unit 23 in the gas leak alarm 2 starts its operation by turning on a power supply (not shown), and determines whether or not a gas appliance discrimination signal from the gas meter 1 has been received (step S21).

  If the gas appliance discrimination signal is not received, the process then returns to step S21. If the gas appliance discrimination signal is received, then the fact that the gas appliance is being used is informed by the LED display or sound of the alarm unit 22. (Step S23). For example, you may alert | report with a voice message, such as "A gas stove is being used."

  Next, based on the received gas appliance discrimination signal, it is determined whether or not the gas appliance in use is a gas appliance within the monitoring area of the gas leak alarm 2 (step S25). This determination is made with reference to a gas appliance table indicating the types of gas appliances in the monitoring area stored in advance in the ROM 23b of the control unit 23.

If the gas appliance in use is a gas appliance within the monitoring area of the gas leak alarm 2, then
The CPU 23a sends a control signal to the sensor drive control unit 25, and drives the gas sensor 24 by the sensor drive control unit 25 (step S27). The sensor drive control unit 25 is configured to normally cut off the drive power supplied to the gas sensor 24 and supply the drive power of the gas sensor 24 on when receiving a control signal from the CPU 23a. Yes.

  Next, the CPU 23a performs the gas detection process by the driven gas sensor 24 as usual (step S29). That is, in this gas detection process, the gas sensor 24 monitors the gas leak, and when the gas leak is detected in this monitoring state, the alarm unit 22 generates a gas leak alarm and notifies the user of the gas leak.

  On the other hand, if it is determined in step S25 that the gas appliance in use is not a gas appliance in the monitoring area, the process is terminated without driving the gas sensor 24.

  Thus, according to the present invention, the gas leak alarm device 2 notifies that the gas appliance is being used while the gas appliance 4 is being used, and the gas appliance in use is within the monitoring area. If it is a gas sensor, the gas sensor 24 can be driven to detect a gas leak, so that it can be informed that the gas is being used, and if the gas instrument being used is not within the monitoring area, the gas sensor 24 can be used. Is not driven, and the gas leak detection operation is not performed, so that power saving in the gas leak alarm 2 can be achieved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the gas appliance discrimination signal has the signal form shown in FIG. 4A, but instead, the signal form shown in FIG. 4B or C may be used. That is, in FIG. 4B, the ON pulse of the ON / OFF signal with a period of 5 seconds is set to one time, and the pulse width is set to a pulse width of 0.6 seconds or more different from each signal shown in FIG. As an example, when the gas appliance determined in step S5 is the gas stove 4a, the pulse width of the on-pulse is 0.6 seconds, when the gas stove 4b is 0.7 seconds, and when the gas heater 4c is used, the pulse width is 0.8 seconds. Seconds. In FIG. 4C, an on / off signal having a period of 5 seconds is set to a period of 6 seconds or more different from each signal shown in FIG. 4 seconds. For example, when the gas appliance determined in step S5 is the gas stove 4a, the cycle is 6 seconds, when the gas stove 4b is 7 seconds, and when the gas heater 4c is 8 seconds.

  In the above-described embodiment, the gas appliance determination signal from the gas meter is transmitted to the gas leak alarm device 2 via the signal line L. However, instead, it may be transmitted wirelessly.

  In the above-described embodiment, the gas flow rate detection unit 11 employs ultrasonic flow rate measurement means. However, the present invention is not limited to this, and other types of flow rate measurement means such as membrane flow rate measurement means are used. You may do it.

  Further, the presence / absence of use of the gas appliance is detected based on the gas flow rate, but the present invention is not limited to this, and other detection methods may be used.

  In the above-described embodiment, the gas appliance discrimination signal is transmitted from the gas meter 1 to the gas leak alarm device 2 in a pulse signal format including repetition of ON / OFF. However, as another embodiment, it is transmitted in a telegram format. You may comprise so that it may do.

  As another example, when the gas appliance alarm signal is no longer received on the gas leak alarm side, the use stop of the gas appliance may be notified by the LED display or sound of the alarm unit 22. For example, you may alert | report with a voice message, such as "The gas stove was stopped."

  Further, as another embodiment, an identification code for identifying a gas appliance installed in the same room (in the monitoring area) as the gas leak alarm 2 and a gas appliance installed in the different place (outside the monitoring area) is provided. It is added to the gas appliance identification signal and transmitted, and on the gas leak alarm 2 side, it is configured so that it can be determined by this identification code whether or not it is a gas appliance installed in the same room as the gas leak alarm 2. Also good.

  Further, the gas leak alarm device 2 may be any of an LP gas alarm device, a city gas alarm device, a CO alarm device, or a combined alarm device thereof.

It is a block diagram which shows the gas leak alarm system provided with the gas leak alarm device which concerns on embodiment of this invention. It is a circuit diagram which shows the detail of the communication interface in the gas leak warning system of FIG. It is a flowchart which shows the gas appliance discrimination | determination process of the gas meter in FIG. (A), (B) and (C) are figures which show the signal form of a gas appliance discrimination | determination signal. It is a flowchart which shows the gas leak detection process of the gas leak alarm device in FIG. It is a figure which shows the example of a signal transmitted to the gas leak alarm from the gas meter in the conventional gas leak alarm system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas meter 2 Gas leak alarm 11 Gas flow rate detection part 13 Control part 13a CPU (gas appliance discrimination means)
13b ROM (second storage means)
15 Communication interface (transmission means)
21 Communication interface (receiving means)
22 Alarm section (alarm means, notification means)
23 control unit 23a CPU (reception determination means, gas appliance determination means)
23b ROM (first storage means)
24 gas sensor 25 sensor drive control unit (sensor drive control means)
4 Gas appliance 4a Gas stove (gas appliance)
4b Gas stove (gas appliance)
4c Water heater (gas appliance)

Claims (4)

A gas leak alarm having a gas sensor for detecting a gas leak in a monitoring area and an alarm means for notifying an alarm when a gas leak occurs, and connected to a gas meter so as to be communicable, and transmitted from the gas meter Receiving means for receiving a gas appliance discrimination signal;
Reception determination means for determining whether or not the gas appliance discrimination signal is received by the reception means, and a first storage storing a gas appliance identification table for identifying a gas appliance installed in a gas leakage monitoring area Means,
When the reception determination means determines that the gas appliance discrimination signal is received, the gas appliance corresponding to the gas appliance discrimination signal is referred to by referring to the gas appliance identification table stored in the first storage means Gas appliance determination means for determining whether or not is a gas appliance installed in a gas leak monitoring area;
When it is determined by the gas appliance determination means that the gas appliance corresponding to the gas appliance determination signal is a gas appliance installed in a gas leakage monitoring area, sensor drive control means for driving the gas sensor;
A gas leak alarm device comprising: The gas leak alarm according to claim 1,
A gas leak alarm device further comprising a notifying means for notifying that the gas appliance is being used when the reception determining means determines that the gas appliance discriminating signal has been received. A gas leak alarm according to claim 1 or 2,
A gas appliance use determination table that indicates a correspondence relationship between a gas flow rate detection unit that detects a gas flow rate flowing to the gas appliance, and a flow rate category to which a gas flow rate consumed during use of the gas appliance belongs. Based on the stored second storage means and the gas flow rate detected by the gas flow rate detector, the gas appliance use discrimination table stored in the second storage means is referred to and in use. A gas meter having a gas appliance discriminating means for discriminating the gas appliance, and a transmitting means for transmitting a gas appliance discriminating signal corresponding to a discrimination result in the gas appliance discriminating means;
A gas leak warning system comprising: The gas leak alarm system according to claim 3,
The gas meter also transmits a signal indicating the operation state of the gas meter to the gas leak alarm, and both the gas appliance determination signal and the signal indicating the operation state of the gas meter are pulses having different ON / OFF repetitive forms. Gas leak warning system characterized by being signaled.

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