JP2004145824A - Gas leak alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas leak alarm capable of easily and speedily performing an operation test without costs. <P>SOLUTION: The alarm comprises a power source monitoring circuit 12 for monitoring on and off of a power source, a count memory circuit 13 for counting the number of times in every time when the power source is detected as turned on by the power source monitoring circuit 12, and a quasi test signal generating circuit 14 for generating and outputting a quasi test signal after starting a test mode when the count memory circuit 13 counts the predetermined number of times. The alarm further comprises a signal processing unit 11 for activating alarm means when a gas detection signal outputted from a gas detecting circuit 10 exceeds a predetermined alarm level or when the quasi test signal is received, and a reset circuit 18 for resetting the number of times of the count memory circuit 13 at the time when a predetermined time elapses from the on time of the power source after the count memory circuit 13 starts to count the number of times, or at the time when the test mode is started during the predetermined period. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a gas leak alarm device that determines a gas leak when a gas detection signal output from a gas detection circuit exceeds a predetermined alarm level and outputs an alarm.
[0002]
[Prior art]
Conventionally, a gas leak alarm as disclosed in Patent Document 1 has been widely used.
[0003]
In this type of gas leak alarm, it is required to periodically conduct an operation check test. As a conventional test method, there is one shown in FIG.
[0004]
That is, in FIG. 9A, butane gas is sprayed on the gas detector circuit 110 with the writer-type test gas G to the alarm device 100, butane gas G is attached to the detection element of the gas detector circuit 110, and the alarm output circuit 120 is activated. ing.
[0005]
In FIG. 9B, a test is performed by attaching an inspection jig 200 to the alarm device 110. The inspection jig 200 includes a support cylinder B, a gas cylinder G packed with methane gas, hydrogen gas, CO gas, or the like, a tube T for passing gas discharged from the gas cylinder G, and an attachment A for contacting the alarm 110. ing.
[0006]
The gas discharged from the gas cylinder G is blown to the gas detection circuit 110 of the alarm device 110 through the tube T, which is detected by the detection element and activates the alarm output circuit 120. Since the attachment A is provided, gas from the tube T does not leak to the outside.
[0007]
Further, FIG. 9C shows a test method of the gas leak alarm with the fire detection function, in which the heat of the dryer D is blown to the heat detection circuit 111 to perform a test.
[0008]
[Patent Document 1]
JP, 7-296278, A [Problems to be solved by the invention]
However, the conventional gas leak alarm has the following problems.
[0009]
That is, when the test method as shown in FIG. 9A is used, butane gas adheres to the detection element, so that it is necessary to incinerate and remove the adhered gas to recover the alarm, which is troublesome. .
[0010]
Also, the alarm device 110 usually has a false alarm prevention time (30 seconds to 3 minutes) for preventing false alarms. During the false alarm prevention time, the gas adhering to the sensing element is incinerated, and then the sensing element is inactivated. Gas detection is performed. Therefore, it takes time for the test, and a quick test has been desired.
[0011]
When the test method shown in FIG. 9B is used, the gas has a small molecular weight, so that the gas does not adhere as described above. However, methane gas and hydrogen gas are easily ignited, and CO gas has high killing ability. Therefore, the risk is high, the management is troublesome, and the cost of hiring a qualified worker is high.
[0012]
When the test method shown in FIG. 9C is used, it is a heavy burden for the operator to carry around the dryer and to route the dryer D to the alarm 110 mounted on the ceiling or the like.
[0013]
An object of the present invention is to provide a gas leak alarm which is proposed to solve the above-mentioned problem and which can perform an operation test easily and speedily without cost.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the first aspect of the present invention proposes the first aspect of the present invention, wherein a power supply monitoring circuit for monitoring power on / off, and each time power on is detected by the power supply monitoring circuit A count memory circuit for performing counting, a pseudo test signal generation circuit for starting an inspection mode and outputting a pseudo test signal when the count memory circuit counts a preset count value, and a gas output from a gas detection circuit. When the detection signal exceeds a predetermined alarm level, or when a pseudo test signal is output, a signal processing unit that activates an alarm unit and a predetermined time from a power-on time at which a count memory circuit starts time measurement. When the check mode is started, or when the inspection mode is started until the predetermined time has elapsed, the reset value of the count memory circuit is cleared. And a door circuit.
[0015]
Claim 2 proposes an additional function of the first invention, wherein a gas detection circuit, a fire detection circuit which detects heat, smoke and the like and outputs a detection signal, and a fire detection circuit for discriminating these detection signals are provided. A signal processing unit is provided to output a pseudo test signal output from the pseudo test signal generation circuit to a different pseudo test signal corresponding to each of the gas detection circuit and the fire detection circuit to detect gas leakage and fire. The corresponding alarm is output.
[0016]
Claim 3 proposes a second present invention, wherein a check switch, a pseudo test signal generating circuit for starting a check mode and outputting a pseudo test signal when the check switch is operated, and a gas detection device. A signal processing unit that activates the alarm unit when the gas detection signal output from the circuit exceeds a predetermined alarm level or when a pseudo test signal is output.
[0017]
Claims 4 to 8 respectively propose additional functions of the second present invention. According to a fourth aspect of the present invention, the inspection switch is a push button switch, and the pseudo test signal is output while the push button switch is pressed and held.
[0018]
According to a fifth aspect of the present invention, the inspection switch is a residual type push button switch, and is configured to output a pseudo test signal for a predetermined time if pressed once.
[0019]
According to a sixth aspect of the present invention, the inspection switch selectively slides between the inspection mode and the normal mode, and outputs a pseudo test signal when the inspection mode is switched to the inspection mode.
[0020]
Claim 7 includes a gas detection circuit, a fire detection circuit that detects heat, smoke, and the like, and outputs a detection signal, and a signal processing unit for discriminating these detection signals. Each time the push button switch is pressed, a different pseudo test signal corresponding to each of the gas detection circuit and the fire detection circuit is output, and an alarm corresponding to gas leak and fire detection is output. It has a configuration.
[0021]
Claim 8 includes a gas detection circuit, a fire detection circuit that detects heat, smoke and the like and outputs a detection signal, and a signal processing unit for determining these detection signals, and the inspection switch is a push button. When the push button switch is pressed and operated, different pseudo test signals corresponding to the gas detection circuit and the fire detection circuit are output, and the alarm corresponding to the gas leak and the fire detection is simultaneously output. And
[0022]
Claims 9 to 11 propose first and second common additional functions. A ninth aspect of the present invention includes an alarm prohibiting function for prohibiting the operation of the alarm unit for a time set in advance as the power-on initial false alarm prevention time from the time of the first power-on, and the signal processing unit outputs the pseudo test signal. When it is received, the alarm prohibition function is invalidated and the alarm means is activated.
[0023]
According to a tenth aspect of the present invention, the apparatus further includes a transfer unit for transmitting the pseudo test signal output from the pseudo test generation circuit to another monitoring receiving device such as a house information panel.
[0024]
The eleventh aspect is configured to further include an alarm timer that defines an output time of an alarm output by the alarm unit.
[0025]
Claim 12 proposes, in the first and second aspects of the present invention, a configuration that facilitates identification of an alarm operation when a fire detection function is added. The system can be identified by using a notification lamp, an alarm, a sound notification, and the like.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the internal configuration of the first present invention.
[0027]
This constitutes a gas detection circuit 10 for detecting gas and outputting a gas detection signal including its concentration, and a signal processing unit, and the gas detection signal output from the gas detection circuit 10 exceeds a predetermined alarm level. The microcomputer 11 operates the alarm output circuit 15 when receiving the pseudo test signal, or receives the output of the pseudo test signal; the power supply monitoring circuit 12 monitors on / off of the power supply circuit 17; A count memory circuit 13 for counting each time the power supply is turned on by the power supply monitoring circuit 12, and a pseudo test for starting an inspection mode and outputting a pseudo test signal when the count memory circuit 13 counts a count value. A signal generation circuit 14, an alarm output circuit 15 including a display lamp and a speaker, a power supply 16, a power supply circuit 17 for turning on and off the power supply 16, And a reset circuit 18 for clearing the count value of the count memory circuit 13 when a predetermined time has elapsed from the time of turning on the camera, or when the inspection mode has been started until the predetermined time has elapsed. ing.
[0028]
The gas detection circuit 10 includes at least a gas element 10A that detects a gas to be detected. The more the gas adheres to the gas element 10A, the lower its resistance value, and as a result, the voltage at the point P increases. The higher voltage is input to the microcomputer 11 as a gas detection signal.
[0029]
That is, since a larger voltage is input to the microcomputer 11 as the gas adheres to the gas element 10A, it is determined that the higher the voltage input, the higher the gas concentration around the gas element 10A.
[0030]
The alarm output circuit 15 includes an alarm timer. The alarm timer is set with a time for outputting an alarm, and automatically stops the alarm when a certain period of time elapses from the alarm output. As setting contents, the output time of only the gas detection alarm and the output time when performing the gas detection alarm and the fire detection alarm are considered.
[0031]
According to the first aspect of the present invention having such a configuration, the operation shown in FIG. 2 can be performed. That is, when the power is turned on and turned on (100), the power supply circuit 17 operates and power is supplied to the entire alarm 1 circuit.
[0032]
This is monitored by the power supply monitoring circuit 12, and the power supply monitoring circuit 12 notifies this to the microcomputer 11 and starts a timer (here, built in the microcomputer 11) to start time measurement (101).
[0033]
This time is monitored by the microcomputer 11, and then the microcomputer 11 performs a false alarm prevention process for a predetermined period of time as a power-on initial false alarm prevention period. Although the operation of the circuit 15 is prohibited, when the pseudo test signal is received, the operation of the alarm output circuit 15 is enabled and activated (102).
[0034]
In other words, during the energization initial false alarm prevention time, no alarm is issued even if the gas detection signal is output during execution of the normal mode processing described later, but an alarm is issued if a pseudo test signal is output during execution of the inspection mode processing described later. You do it.
[0035]
When the power is turned on, the count memory circuit 13 causes the count to be incremented by one by the notification from the power supply monitoring circuit 12 to the microcomputer 11 (103). If the count value at that time (also referred to as a count value) is a preset value, the count value is reset to 0 by the reset circuit 18 (105), and the inspection mode process is started (106).
[0036]
When such an inspection mode process is started, the voltage from the microcomputer 11 is applied from the pseudo test signal output circuit 14 to the base of the transistor, and the voltage from the power supply applied to the emitter is amplified. Output from the collector. That is, the transistor performs the function of a switching circuit.
[0037]
The amplified voltage is input to the microcomputer 11 as a pseudo test signal. At this time, the microcomputer 11 activates the alarm output circuit 15 to output an alarm. The alarm output mode includes, for example, display by a display lamp, output of an alarm and a voice message by a speaker, and is not limited.
[0038]
In such an inspection mode, if the microcomputer 11 determines that a predetermined time has elapsed since the output of the pseudo test signal, the microcomputer 11 ends the inspection mode and shifts to a normal mode described later.
[0039]
On the other hand, in step 104, if the time counted by the timer has counted a predetermined time (107), the microcomputer 11 resets the count value to 0 by the reset circuit 18 (108), and starts the normal mode processing. (109).
[0040]
When such normal mode processing is started, the concentration level is determined based on the gas detection signal input from the gas detection circuit 10, and if the concentration level exceeds a predetermined alarm level, the alarm output circuit 15 is activated. To output an alarm.
[0041]
FIG. 3 is a diagram showing another example of the configuration of the first present invention. The alarm 1A has a configuration in which a fire detection circuit 19 that detects heat, smoke, and the like and outputs a detection signal is added to the configuration of the alarm 1 described above.
[0042]
In the normal mode processing, the microcomputer 11 issues an alarm based on the gas detection signal input from the gas detection circuit 10 and also issues an alarm based on the fire detection signal input from the fire detection circuit 19. At this time, in order to clarify which alarm is to be made, a distinction is made in the lighting or blinking state of the display lamp, the distinction is made in the output form of the alarm, and the alarm type is specified by a voice message or the like.
The signal format of the fire detection signal is different from that of the gas detection signal.
[0043]
In the inspection mode processing, the pseudo test signal generation circuit 14 sequentially outputs a pseudo test signal of the same format as the gas detection signal and a pseudo test signal of the same format as the fire detection signal, and responds to each test signal. The alarms are sequentially output from the alarm output circuit 15. In addition, each alarm mode is the same as that of the normal mode. The microcomputer 11 may create each format by changing the voltage application interval to the pseudo test signal generation circuit 14. Then, a different pulse is output as a pseudo test signal.
[0044]
The reset circuit 18 is provided independently here, but may be built in the microcomputer 11.
[0045]
Next, the second invention will be described. FIG. 4 is a diagram showing an example of the internal configuration of the second embodiment of the present invention, and FIG. 5 is a diagram showing an example of this external appearance. This alarm device 1B is different from the above-described alarm device 1 in that an inspection switch SW is added and that the alarm device 1B does not include the count memory circuit 13 and the reset circuit 18.
[0046]
This operates as shown in FIG. The details of each step process are the same as those in FIG.
When the power is turned on, the microcomputer 11 starts a built-in timer, performs a false alarm prevention process for a predetermined time, and then performs a normal mode process (200 to 203).
[0047]
However, when the inspection switch SW is operated after the start of the normal mode processing, the microcomputer 11 performs the inspection mode processing (204, 205).
[0048]
Note that the inspection switch SW can be configured by a push button switch, a residual type push button switch, a slide type switch, or the like.
[0049]
In the case of a push-button switch, a signal notifying the signal is output to the microcomputer 11 while the button is pressed and held, and the microcomputer 11 sends a signal to the pseudo test signal generation circuit 14 while receiving the signal from the push-button switch. The voltage is applied and the pseudo test signal is continuously output.
[0050]
In the case of a residual push button switch, if the switch is pressed once, a signal to that effect is output to the microcomputer 11 once. When the microcomputer 11 receives this signal, it performs a pseudo test for a certain period of time. The configuration is such that a signal is continuously output.
[0051]
In the case of a configuration using a slide switch, the inspection mode and the normal mode are selectively slid, and a signal corresponding to each of them is output to the microcomputer 11. , To output a pseudo test signal.
[0052]
FIG. 7 is a diagram showing another example of the internal configuration of the second invention.
[0053]
The alarm 1C has a configuration in which a fire detection circuit 19 that detects heat, smoke, and the like and outputs a detection signal is added to the configuration of the alarm 1B described above. The inspection switch SW is constituted by the above-described push button switch or slide switch.
[0054]
In this device, every time the check switch SW is pressed and held, the microcomputer 11 outputs a pseudo test signal of the same format as the gas detection signal and a pseudo test signal of the same format as the fire detection signal from the pseudo test signal generation circuit 14. The alarms are sequentially output, and alarms corresponding to the respective test signals are sequentially output from the alarm output circuit 15.
[0055]
Each time the check switch SW is operated, in addition to sequentially outputting the gas detection alarm and the fire detection alarm, once the check switch SW is pressed once, the gas and fire alarm functions can be automatically checked. It may be.
[0056]
To this end, while the check switch SW is pressed and held, the microcomputer 11 outputs a pseudo test signal in the same format as the gas detection signal, a fire test signal and a pseudo test signal in the same format from the pseudo test signal generation circuit 14. The alarms are sequentially output, and alarms corresponding to the respective test signals are sequentially output from the alarm output circuit 15.
[0057]
At this time, in order to clarify which alarm is to be made, a distinction is made in the lighting or blinking state of the display lamp, the distinction is made in the output form of the alarm, and the alarm type is specified by a voice message or the like.
[0058]
In the first and second embodiments of the present invention, as shown in FIG. 8, a transfer circuit 20 is provided, and a pseudo test signal from the pseudo test generation circuit 14 is sent to a monitoring receiver such as a house information panel. You may do so. In this case, a warning is issued even on a house information panel or the like, which is convenient and can also serve as an alarm operation test in the monitoring and receiving device.
[0059]
In such a case, it is desirable to turn on the power of the alarm device 1D before the monitoring and receiving device. In this case, even if the monitoring and receiving device has the disconnection detection function of the alarm device 1D, the power supply is turned on to the alarm device 1D, so that the monitoring and receiving device may determine that the alarm device 1D is disconnected. Absent.
[0060]
Note that, here, the transfer circuit 20 is added to the alarm device 1 described above, but the present invention is not limited to this, and the transfer circuit 20 may be added to the alarm devices 1A to 1C.
[0061]
【The invention's effect】
As can be understood from the above description, in claim 1 of the present invention, the counting is performed every time the power is turned on, and when the number of counts within a predetermined time reaches a certain number, the mode is automatically set to the inspection mode and the pseudo test signal is used. Since the operation test can be performed, the operation test can be performed easily and speedily without any cost.
[0062]
In addition, since the count is reset after a predetermined time has elapsed since the power was turned on, the count value cannot be set to a constant value unless the power is repeatedly turned on within the predetermined time, and the power supply to the alarm device due to a power failure or breaker down etc. Is restored after the power supply is shut off, the count value accumulated up to that point reaches a certain number, and a pseudo test signal is output and no alarm is issued. Therefore, after the recovery, the recoverer and the surrounding people are not surprised.
[0063]
Furthermore, even if the predetermined time has not elapsed since the power was turned on, the count value is reset when the mode is changed to the inspection mode. Not surprisingly, the recoverer and those around him are not surprised.
[0064]
According to the second aspect of the present invention, both the gas alarm and the fire alarm are performed by the pseudo test signals corresponding to the gas detection circuit and the fire test circuit, respectively. Can be convenient.
[0065]
According to the third aspect, when the inspection switch is operated, the inspection mode is set, and the operation test is performed. Therefore, the operation test can be performed only by operating the inspection switch, which is convenient.
[0066]
According to the fourth aspect, the inspection switch is a push button switch, and the pseudo test signal is output while the push button switch is pressed and held. Therefore, the alarm test can be continued as long as the push button switch is kept pressed. , Is convenient.
[0067]
According to a fifth aspect of the present invention, the inspection switch is a residual type push button switch, and if the switch is pressed once, a pseudo test signal is output for a predetermined time, so that the push operation is not continued as in the push button switch. The operation test can be performed only by touching and pressing once, and the burden on the operator is reduced.
[0068]
The inspection switch is configured to selectively slide the inspection mode between the inspection mode and the normal mode, and to output a pseudo test signal when the inspection mode is switched to the inspection mode. It can be easily confirmed whether the mode is the normal mode or the inspection mode.
[0069]
Further, both modes can be selectively executed only by sliding, which is convenient and reduces the burden on the operator.
[0070]
In the seventh aspect, each time the check switch is pressed, both the gas alarm and the fire alarm are sequentially performed by the pseudo test signals corresponding to the gas detection circuit and the fire test circuit, respectively. The test can be performed only once by pressing the check switch, which is convenient.
[0071]
According to the present invention, while the check switch is pressed, both the gas alarm and the fire alarm are simultaneously performed by the pseudo test signals corresponding to the gas detection circuit and the fire test circuit, respectively. The test can be performed once by simply pressing the check switch, which is convenient.
[0072]
According to the ninth aspect of the present invention, an alarm disabling function for inhibiting the operation of the alarm means is provided for a time set in advance as the power-on initial false alarm prevention time from the time of the first power-on. Can be prevented.
[0073]
Further, when there is a pseudo test signal, the alarm prohibiting function is invalidated and the alarm means is operated, so that the operation test can be performed even within the initial power failure prevention time, and the time required for the operation test can be further reduced.
[0074]
According to the tenth aspect, a pseudo test signal output from the pseudo test generation circuit is further provided with a transfer means for transmitting the pseudo test signal to another monitoring receiving device such as a house information panel. An alarm is also output from a device located away from the alarm, and it can be confirmed that the device is operating normally, which is convenient.
[0075]
According to the eleventh aspect, since an alarm timer for defining the output time of the alarm output by the alarm means is further provided, the alarm is not continuously output during the execution of the inspection mode, and the troublesome operation of the recovery operation can be omitted. , The labor of the operator can be reduced.
[0076]
In particular, when the alarm output time specified by the alarm timer elapses after the alarm in the inspection mode is output, the mode is automatically shifted to the normal mode, and the alarm recovery and the mode switching operation become unnecessary, and the burden on the operator is reduced. Can be reduced.
[0077]
According to the twelfth aspect, the alarm operation at the time of gas leak detection or fire detection can be identified by using a notification lamp, an alarm, an audio notification, or the like, so that it is possible to easily identify which alarm operation is being performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of the internal configuration of the first invention. FIG. 2 is a flowchart showing the operation of the first invention. FIG. 3 is a diagram showing another example of the internal configuration of the first invention. FIG. 4 is a diagram showing an example of the internal configuration of the second invention. FIG. 5 is a diagram showing an external appearance example of the second invention. FIG. 6 is a flowchart showing the operation of the second invention. 2 is a diagram showing another example of the internal configuration of the present invention. FIG. 8 is a diagram showing still another example of the first and second inventions. FIG. 9 is a diagram showing a conventional alarm device operation test.
1, 1A to 1D gas leak alarm 10 gas detection circuit 11 microcomputer 12 power supply monitoring circuit 13 count memory circuit 14 pseudo test signal generation circuit 15・ Alarm output circuit 16 ・ ・ ・ Power supply 18 ・ ・ ・ Reset circuit 19 ・ ・ ・ Fire detection circuit 20 ・ ・ ・ Transfer circuit SW ・ ・ ・ Inspection switch

Claims (12)

In a gas leak alarm device that determines a gas leak when a gas detection signal output from a gas detection circuit exceeds a predetermined alarm level and outputs an alarm,
A power monitoring circuit that monitors power on / off,
A count memory circuit that counts each time power-on is detected by the power supply monitoring circuit;
A pseudo test signal generation circuit for starting an inspection mode and outputting a pseudo test signal when the count memory circuit counts a preset count value;
When the gas detection signal output from the gas detection circuit exceeds a predetermined alarm level, or when receiving the output of a pseudo test signal, a signal processing unit that operates alarm means,
At the time when a predetermined time has elapsed from the time when the power is turned on at which the count memory circuit starts measuring time, or at the time when the inspection mode is started until the predetermined time has elapsed, the count memory circuit is started. A gas leak alarm including a reset circuit for clearing a count value. In claim 1,
The gas detection circuit, a fire detection circuit that detects heat, smoke and the like and outputs a detection signal, and a signal processing unit for determining these detection signals are provided,
The pseudo test signal output from the pseudo test signal generation circuit outputs different pseudo test signals respectively corresponding to the gas detection circuit and the fire detection circuit, and outputs an alarm corresponding to gas leak and fire detection. Gas leak alarm that is configured. In a gas leak alarm device that determines a gas leak when a gas detection signal output from a gas detection circuit exceeds a predetermined alarm level and outputs an alarm,
An inspection switch,
When the check switch is operated, a test signal generation circuit for starting a check mode and outputting a test signal;
A signal processing unit that activates an alarm unit when a gas detection signal output from a gas detection circuit exceeds a predetermined alarm level or when the pseudo test signal is output; . In claim 3,
A gas leak alarm device, wherein the inspection switch is a push button switch, and the pseudo test signal is output while the push button switch is pressed and held. In claim 3,
The gas leak alarm device is configured such that the inspection switch is a residual type push button switch, and if the switch is pressed once, the pseudo test signal is output for a predetermined time. In claim 3,
The gas leak alarm device, wherein the inspection switch selectively slides between an inspection mode and a normal mode and outputs the pseudo test signal when the inspection switch is switched to the inspection mode. In claim 3,
The gas detection circuit, a fire detection circuit that detects heat, smoke and the like and outputs a detection signal, and a signal processing unit for determining these detection signals,
In addition, the inspection switch is constituted by a push button switch, and every time the push button switch is pressed, a different pseudo test signal corresponding to each of the gas detection circuit and the fire detection circuit is output, and a gas leak is generated. A gas leak alarm that is configured to output an alarm corresponding to fire detection. In claim 3,
The gas detection circuit, a fire detection circuit that detects heat, smoke and the like and outputs a detection signal, and a signal processing unit for determining these detection signals,
In addition, the inspection switch is constituted by a push button switch. When the push button switch is pressed, different pseudo test signals corresponding to the gas detection circuit and the fire detection circuit are output, and gas leakage and fire are detected. A gas leak alarm that is configured to output an alarm corresponding to the detection at the same time. In any one of claims 1 to 8,
During the time set as the power-on initial false alarm prevention time in advance from the time of the first power-on, an alarm prohibition function for prohibiting the operation of the alarm means is provided.
The gas leak alarm device, wherein the signal processing unit, when receiving the pseudo test signal, invalidates the alarm prohibition function and activates the alarm unit. In any one of claims 1 to 9,
A gas leak alarm device further comprising a transfer means for sending a pseudo test signal output from the pseudo test generation circuit to another monitoring and receiving device such as a house information panel. In any one of claims 1 to 10,
A gas leak alarm device further comprising an alarm timer for defining an output time of an alarm output by the alarm means. 9. A gas leak alarm device according to claim 2, 7 or 8, wherein an alarm operation at the time of gas leak detection or fire detection can be identified by using a notification lamp, an alarm, an audio notification, or the like.

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