JP5032373B2 - Alarm and release method - Google Patents

Description

  The present invention relates to an alarm device and a canceling method, and in particular, a gas sensor for detecting a carbon monoxide concentration, and the generation of carbon monoxide at an alarm level based on a carbon monoxide concentration of a predetermined level or more detected by the gas sensor. An abnormality detecting means for detecting that it has reached, and a combustion stopping means for stopping the combustion of the gas combustion appliance when the abnormality detecting means detects that the generation of carbon monoxide has reached an alarm level. The present invention relates to an alarm device and a canceling method for canceling the combustion stop of the gas combustion appliance by the alarm device.

  When the gas burning instrument is incompletely burned, carbon monoxide (hereinafter, CO) is generated. If the user of the gas combustor continues to use the gas combustion device without noticing CO generation due to incomplete combustion, the concentration of carbon monoxide hemoglobin (hereinafter referred to as COHb) in the blood reaches a dangerous level. Therefore, an alarm device that determines whether or not the generation of CO has reached an alarm level based on the CO concentration of a predetermined level or more detected by the gas sensor, and generates an alarm to notify that when it has been determined. Has been proposed. There has also been proposed an alarm device that outputs a shut-off signal to a gas meter for shutting off the combustion of the gas combustion appliance by interrupting the gas supply to the gas combustion appliance when an alarm is generated (for example, Patent Document 1). When the shut-off signal from the alarm is input, the gas meter closes the built-in shut-off valve to shut off the gas supply to the gas combustion appliance. Thereby, combustion of a gas burning instrument stops.

  The alarm device automatically or manually ventilates after the alarm, and when the CO concentration falls below the predetermined level, or when a uniform delay time elapses after falling below the predetermined level, the alarm signal is sent to the gas meter. Output. When the release signal from this alarm is input, the gas meter can open the shut-off valve in accordance with the operation of the valve opening switch. The gas burning instrument can be reburned by opening the shut-off valve.

By the way, according to a report from Coburn et al., COHb accumulated in the human body due to exposure in a CO atmosphere is considered to change exponentially, and is a UL standard used as a standard for CO alarms in the United States. In 2034, it is used in a partially simplified form as shown in the following formula (1).
% COHb _t =% COHb ₀ [e ^{− (t / 2398B)} ] +218 [1-e ^{− (t / 2398B)} ] × [0.0003 + CO concentration / 1316]] (1)
(% COHb _t : COHb after elapse of t minutes,% COHb ₀ : COHb of elapsed time 0 minutes, B = 0.0404)

FIG. 4 shows the relationship between the elapsed time after COHb reaches 5%, 10%, 15%, 20%, 25%, 30% and COHb using the above-described equation (1). As shown in the figure, the time for removing COHb which is considered to be accumulated in the human body differs depending on the size of COHb accumulated in the human body. Further, even when an alarm is issued when COHb reaches an alarm value (for example, 20%), the conditions from the alarm to ventilation are actually different. For this reason, there may be a case where the uniform delay time becomes excessive or insufficient. In other words, there are cases where the gas combustion appliances cannot be re-burned even though the ventilation is performed immediately after the alarm and the COHb is sufficiently lowered, or the COHb is sufficiently lowered without the ventilation immediately after the alarm is issued. There was a case where the gas combustion appliance was reburned even though it was not.
Japanese Utility Model Publication No. 6-11093

  Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide an alarm device capable of setting a delay time without excess or deficiency.

The invention according to claim 1, which has been made to solve the above problems, includes a gas sensor for detecting a carbon monoxide concentration, and the gas sensor from the time when the carbon monoxide concentration detected by the gas sensor exceeds a predetermined level to the present time. An abnormality detection means for detecting that the generation of carbon monoxide has reached an alarm level based on the carbon monoxide concentration detected by the method, and that the generation of carbon monoxide has reached an alarm level by the abnormality detection means Combustion stop means for stopping the combustion of the gas combustion appliance when detected, the carbon monoxide concentration detected by the gas sensor before the combustion stop by the combustion stop means is after exceeding a predetermined level, wherein the detected carbon monoxide concentration by the gas sensor after the combustion stop by is performed combustion stop means before To below a predetermined level, carbon monoxide hemoglobin concentration in the blood that is accumulated during, or, the delay time determination means for determining a delay time corresponding to the value, corresponding to the carbon monoxide hemoglobin concentration, the combustion The combustion of the gas combustion appliance is stopped after the delay time determined by the delay time determining means has elapsed since the carbon monoxide concentration detected by the gas sensor has dropped below the predetermined level after the combustion stop by the stop means has been performed. And a release means for releasing the alarm.

According to a second aspect of the invention, the storage means the relationship between arrival time to carboxyhemoglobin concentration of carbon monoxide concentration and the blood in the predetermined oxygen concentration is in the alarm value is stored in advance, the storage The reciprocal time of the arrival time corresponding to the carbon monoxide concentration detected by the gas sensor from the time when the carbon monoxide concentration detected by the gas sensor exceeds the predetermined level from the relationship stored in the means. Integrating means for obtaining a product, and when the time product of the reciprocal of the arrival time obtained by the integrating means exceeds a threshold value, the abnormality detecting means reaches the alarm value when the carbon monoxide hemoglobin concentration reaches an alarm value. It is set to detect that the generation of carbon monoxide has reached an alarm level, and the delay time determining means is stopped by the combustion stopping means. The time product of the reciprocal of the arrival time obtained by the integration means when the integration by the integration means is performed until the carbon monoxide concentration detected by the gas sensor falls below the predetermined level and falls below the predetermined level. 2. The alarm device according to claim 1, wherein a delay time corresponding to a time product of a reciprocal of the arrival time is determined as a value corresponding to the concentration of carbon monoxide hemoglobin. .

According to a third aspect of the present invention, there is provided a gas sensor for detecting a carbon monoxide concentration, and a carbon monoxide concentration detected by the gas sensor from when the carbon monoxide concentration detected by the gas sensor exceeds a predetermined level to the present time. On the basis of an abnormality detection means for detecting that the generation of carbon monoxide has reached an alarm level, and when the occurrence of carbon monoxide has been detected to have reached an alarm level by the abnormality detection means, In a release method for releasing the combustion stop of the gas combustion appliance by an alarm device provided with a combustion stop means for stopping combustion, the one detected by the gas sensor before the combustion stop by the combustion stop means is performed. from carbon oxides concentration exceeds the predetermined level, the combustion stop by the combustion stop means is detected by the gas sensor after being made And determining to carbon oxides concentration is below the predetermined level, carbon monoxide hemoglobin concentration in the accumulated blood during, or a value corresponding to the carbon monoxide hemoglobin concentration, the delay time corresponding to, The combustion stop of the gas combustion appliance is released after the lapse of the delay time determined by the step after the carbon monoxide concentration detected by the gas sensor falls below the predetermined level after the combustion stop by the combustion stop means is performed. And a step of sequentially performing the steps.

  As described above, according to the first and third aspects of the present invention, the delay time determining unit is configured to perform the process after the carbon monoxide concentration detected by the gas sensor before the combustion stop by the combustion stop unit exceeds a predetermined level. The carbon monoxide concentration in the blood accumulated until the carbon monoxide concentration detected by the gas sensor falls below a predetermined level after the combustion is stopped by the combustion stopping means, or the carbon monoxide hemoglobin concentration. Since the delay time corresponding to the corresponding value is determined, the delay time can be set without excess or deficiency.

  According to the second aspect of the present invention, since the delay time can be set by diverting the integrating means provided for detecting the abnormality by the abnormality detecting means, the configuration can be simplified and the cost can be reduced.

  The alarm device and release method of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of an alarm device that implements the release method of the present invention. As shown in the figure, the alarm device includes a gas sensor 10. As the gas sensor 10, for example, an electrochemical sensor in which a current corresponding to the CO concentration flows by an oxidation reaction of carbon monoxide (hereinafter referred to as CO) is used. The data is output to the computer (μCOM) 12.

  The μCOM 12 is a central processing unit (hereinafter referred to as CPU) 12A that performs various processes according to a processing program, a ROM 12B that is a read-only memory that stores a program for processing performed by the CPU 12A, and various processing steps in the CPU 12A. A RAM 12C, which is a readable / writable memory having a work area to be used, a data storage area for storing various data, and the like, are connected by a bus line.

  CPU12A mentioned above takes in the output of the gas sensor 10, and detects CO density | concentration. Further, the alarm device includes a speaker 13, a sound alarm output circuit 14, and an external connection terminal 15. The speaker 13 outputs a CO generation alarm. The audio alarm output circuit 14 is a circuit that drives the speaker 13 and is controlled by the CPU 12A. The external connection terminal 15 is a terminal for connecting to, for example, a gas meter (not shown) as an external device. Under the control of the CPU 12A, a cut-off signal and a release signal are output from the external connection terminal 15 to a gas meter (not shown). When a gas meter (not shown) receives a shut-off signal, the built-in shut-off valve is closed to shut off the gas supply to the gas combustion appliance. Thereby, combustion of a gas burning instrument stops. In addition, when a gas meter (not shown) receives the release signal, the built-in shut-off valve is opened to resume the supply of gas to the gas combustion appliance. Thereby, the combustion stop of a gas combustion instrument is cancelled | released.

  Next, the interruption condition for outputting the interruption signal of the alarm device described above will be described below with reference to FIG. FIG. 2 is a log-log graph showing the relationship between the CO concentration in an oxygen concentration of 20% and the arrival time until the carbon monoxide hemoglobin concentration (hereinafter referred to as COHb) in the blood reaches 20%. As shown in FIG. 2, for example, when the oxygen concentration is 20%, if 300 (ppm) CO continues to be generated, COHb = 20% after 30 minutes, and if 400 (ppm) CO continues to be generated, 20%. After minutes, COHb = 20%.

As is clear from FIG. 2, the arrival time decreases exponentially as the CO concentration increases. That is, the relationship between the CO concentration and the arrival time until COHb reaches 20% can be expressed by a power function equation or a logarithmic function equation as shown in the following equations (2) and (2) ′.
T _R = a1 · X ^−b1 (T _R : arrival time, X: CO concentration, a1, b1: constant) (2)
LogT _R = −b1 · LogX + Loga1
= −b1 · LogX + c (∵Loga1 = c) (2) ′

Next, in the present embodiment, a case where a CO abnormality alarm is generated when the oxygen concentration is assumed to be 20% and COHb = 20% (alarm value) will be described. In this case, the power as shown in the above formulas (2) and (2) ′ representing the relationship between the CO concentration in the oxygen concentration of 20% as shown in FIG. 2 and the arrival time until COHb reaches 20%. A function expression or a logarithmic function expression is stored in advance in, for example, the ROM 12B (= storage means). Next, the reciprocal-time product of the arrival time T _R which corresponds to the CO concentration detected by the gas sensor 10, the relationship between the CO concentration will be described. First, when 300 ppm of CO is generated, the arrival time corresponding to this CO concentration is about 30 minutes as shown in FIG. Therefore, the reciprocal is 1/30, and the reciprocal / time product increases with a slope of 1/30 as shown in FIG. If 300 ppm of CO continues for 10 minutes, the reciprocal / time product is 10/30.

  Thereafter, when the CO concentration changes to 200 ppm, the arrival time corresponding to this CO concentration is about 50 minutes, as shown in FIG. Therefore, the reciprocal is 1/50, and the reciprocal / time product increases with a slope of 1/50 smaller than the slope 1/30 when CO of 300 ppm is generated as shown in FIG. If 200 ppm of CO continues for 3 minutes, the reciprocal / time product is (10/30 + 3/50). Furthermore, when the CO concentration changes to 400 ppm, the arrival time corresponding to this CO concentration is about 20 minutes, as shown in FIG. Therefore, the reciprocal becomes 1/20, and the reciprocal / time product increases with a slope of 1/50 of the generation time of 200 and 300 ppm, and a slope of 1/20 larger than 1/30, as shown in FIG.

  As is clear from this, the reciprocal / time product described above increases more rapidly as the CO concentration is higher, and gradually increases as the CO concentration is lower. That is, the current reciprocal / time product corresponds to the current COHb for COHb = 20%. Therefore, when the current reciprocal / time product reaches 1, it can be determined that COHb is 20%. Note that the relationship between the reciprocal of the arrival time / time product and COHb is described in Japanese Patent Application Laid-Open No. 2007-58838, and thus detailed description thereof is omitted here. Thus, even when COHb is not directly calculated using a complicated high-order regression equation, an alarm when COHb reaches 20% can be generated.

Therefore, CPU 12A starts the integral of the inverse-time product .SIGMA.1 / T _R of the CO concentration detected by the gas sensor 10 exceeds a predetermined level or higher the arrival time T _R. Then, CPU 12A outputs relative gas meter integrating the inverse-time product .SIGMA.1 / T _R is not shown cut-off signals from the external connection terminal 15 with generating an alarm to reach 1. When the gas meter receives the cutoff signal, the gas meter closes the built-in cutoff valve to shut off the gas supply to the gas combustor. Thereby, combustion of a gas combustor is stopped. The predetermined level is set to such a value that COHb reaches the alarm level when the generation of the CO concentration equal to or higher than the predetermined level is continued. Conversely, the value is set such that COHb does not reach the alarm level even if the generation of the CO concentration below the predetermined level continues.

Next, release conditions for releasing the combustion stop of the gas combustor described above will be described. As described in the background art described above, the time during which COHb accumulated in the human body is removed varies depending on conditions from when an alarm is generated until ventilation is performed. In other words, even when COHb reaches 20% and an alarm is generated, ventilation is performed and the CO concentration falls below a predetermined level, the case where ventilation is performed immediately after alarming, and after alarming The COHb accumulated in the human body is different from the case where ventilation is not performed immediately. Further, as shown in FIG. 4, the time for removing COHb that is considered to be accumulated in the human body differs depending on the magnitude of COHb accumulated in the human body. FIG. 4 is a graph showing the relationship between COHb and the elapsed time after the CO concentration becomes almost 0 after COHb reaches 5%, 15%, 20%, 10%, 25%, and 30%. Therefore, the decay time T _A until COHb of 5%, 10%, 15%, 20%, 25%, and 30% decays below a certain value is expressed by Equation (3), which is a reverse calculation value of Equation (1). Can be represented.
T _A = a2 · Ln (COHb) + b2 (a2 and b2 are constants corresponding to constant values) (3)

FIG. 5 shows the relationship between the decay time T _A and COHb until COHb determined using the above equation (3) decays below a certain value (1%, 2%, 5%, 10%). As shown in the figure, the relationship between the decay time T _A and COHb is a straight line in semi-log plot. Now, let COHb be COHbn when ventilation is performed after the alarm is generated and the CO concentration falls below a predetermined level. The decay time T _A shown in the following equation (3) ′ in which COHbn is substituted into equation (3) is set as the delay time T _D. Then, by outputting a release signal after a delay time T _D has elapsed CO concentration was set as described above from the point of below a predetermined level after an alarm occurs, COHb be different ventilation conditions after an alarm occurrence constant value A release signal can be output at the time when:
T _D = T _A = a 2 · Ln (COHbn) + b 2 (3) ′

In the present embodiment, as a value corresponding to the COHbn, CO concentration accumulated a place of reciprocal-time product .SIGMA.1 / T _R the COHbn the arrival time T _R during the period from exceeding a predetermined level to below the predetermined level As shown in the following equation (4), the decay time T _A until COHb falls below a certain value is calculated, and the decay time T _A is set as the delay time T _D. To do.
T _D = T _A = A · Ln (Σ1 / T _R ) + B (A and B are constants corresponding to constant values) (4)

The detailed operation of the alarm device described above will be described below with reference to the flowchart showing the processing procedure of the CPU 12A in FIG. First, when power is supplied to the alarm device, the CPU 12A detects the CO concentration using the gas sensor 10 (step S1). Next, CPU 12A, when CO concentration detected in step S1 exceeds a predetermined level C1 (at step S2 Y), serves as integration means performs the integration of the reciprocal of the arrival time T _R which corresponds to the CO concentration inverse-time A product Σ (1 / T _R ) is obtained (step S3).

In step S <b> 3, the CPU 12 </ b> A detects the CO concentration at regular intervals t using the gas sensor 10. Then, for example, the exponential function expression of the above equations (2) and (2) ′ showing the relationship between the CO concentration in the oxygen concentration of 20% stored in advance in the ROM 12B and the arrival time until COHb becomes 20%. Then, the detected CO concentration is substituted into the logarithmic function equation, and the arrival time T _Rn corresponding to the current CO concentration is obtained. Thereafter, the inverse of this time by adding the value t / T _Rn obtained by multiplying the reciprocal 1 / T _Rn of the constant interval t and the arrival time T _Rn to the inverse-time product Σ previously calculated (1 / T _R) · Let time product Σ (1 / T _R ).

Next, the CPU 12A determines that COHb has not reached 20% if the inverse number / time product Σ (1 / T _R ) obtained in step S3 is less than a threshold A (for example, 1) (N in step S4). Then, the process returns to step S3 again to continue the reciprocal integration.

On the other hand, the CPU 12A functions as an abnormality detection means, and if the reciprocal / time product (1 / T _R ) is equal to or greater than the threshold A (Y in step S4), COHb reaches 20% and the occurrence of CO is alarmed. After detecting that the level has been reached, the process proceeds to step S5. In step S <b> 5, the CPU 12 </ b> A functions as a combustion stop unit, outputs a CO alarm signal to the sound alarm output circuit 14, and outputs a cutoff signal for stopping combustion of the gas combustion appliance from the external connection terminal 15. In response to the CO alarm signal, the audio alarm output circuit 14 controls the speaker 13 to generate an alarm indicating the occurrence of CO. In addition, when a shut-off signal is received via the external connection terminal 15, a gas meter (not shown) closes a built-in shut-off valve and stops the supply of gas to the gas combustion appliance. Thereby, combustion of a gas burning instrument is stopped.

Then, CPU 12A until CO concentration detected by the gas sensor 10 is below a predetermined level C1 (at step S7 Y), and continues the integral of the inverse of the arrival time T _R which corresponds to the CO concentration (step S6). When the CO concentration detected by the gas sensor 10 falls below the predetermined level C1 (Y in Step S7), the CPU 12A functions as a delay time determining means, and the reciprocal / time product Σ (1 / T _R of the arrival time T _R at this time point. ) Is substituted into the above-described equation (4), and the decay time T _A obtained is set as the delay time T _D (step S8). Next, CPU 12A starts the countdown of the delay time T _D of the step S8 (step S9). When the delay time T _D is 0 (Y in step S10), CPU 12A acts as release means, after outputting a release signal for releasing the combustion stop of the gas combustion appliances from the external connection terminal 15 (step S11 ), The process returns to step S1.

According to the alarm device described above, the CPU 12A outputs a cutoff signal after the CO concentration detected by the gas sensor 10 exceeds a predetermined level before the cutoff signal is output (before the combustion of the gas combustion appliance is stopped). reciprocal of the arrival time T _R the CO concentration detected by the gas sensor 10 (the combustion after the stop of the gas combustion appliances) after being corresponds to COHb of stored blood until below a predetermined level Since the delay time T _D corresponding to the time product Σ1 / T _R is determined, the delay time can be set without excess or deficiency.

Further, according to the alarm device as described above, CPU 12A is integral to the determined COHb when inverse-time product .SIGMA.1 / T _R of the arrival time T _R has exceeded the threshold value A is CO reaches the alarm value 20% the generation is set to detect that it has reached the alarm level, the CO concentration detected by the gas sensor 10 the integral of the inverse-time time reached after the blocking signal is output T _R product .SIGMA.1 / T _R made to perform to below a predetermined level, the inverse-time product .SIGMA.1 / T _R of the arrival time T _R when below a predetermined level as a value corresponding to the COHb, inverse-time product of the arrival time T _R .SIGMA.1 / T It is configured to determine a delay time T _D corresponding to _R. Accordingly, it is possible to set the inverse-time product .SIGMA.1 / T _R diverted by the delay time T _D of the arrival time T _R determined in order to perform the CO occurrence detection, reducing the cost structure is simple Can do.

In the above-described embodiment, the exponential function expression and the logarithmic function expression of Expressions (2) and (2) ′ indicating the relationship between the generation time of each CO concentration and COHb are stored. It was also stores the logarithmic relationship of Equation (4) showing the relationship between the inverse-time product .SIGMA.1 / T _R and the delay time T _D. However, when the index calculation and logarithmic calculation are difficult due to the performance of the CPU 12A, the above exponential function expression and logarithmic function expression are approximated by a combination of several linear functions, and the arrival time with respect to the CO concentration is determined by the approximate expression. it is conceivable to determine the T _R and the delay time T _D. Moreover, and tables showing the relationship between the generation time of each CO concentration and COHb, may be stored a table showing the relationship between the inverse-time product .SIGMA.1 / T _R and the delay time T _D.

  In the above-described embodiment, the electrochemical sensor is used as the gas sensor 10. However, the gas sensor 10 used in the present invention is not limited to the electrochemical type, and may be, for example, a semiconductor type or a catalytic combustion type as long as it detects CO.

Further, in the embodiment described above, but had set directly delay time T _D from the reciprocal-time product .SIGMA.1 / T _R using Equation (4), the present invention is not limited thereto. For example, by using a conversion formula or table that shows the relationship between the inverse-time product .SIGMA.1 / T _R and COHb, seeking COHb, the COHb obtained by setting the assignment to the delay time T _D in the formula (3) Also good.

Further, in the embodiment described above, but had sought inverse-time product .SIGMA.1 / T _R of the arrival time T _R as a value corresponding to the COHb, the present invention is not limited thereto. If the installation conditions are limited, as in the case of current household incomplete combustion alarms that JIA has standardized, the cutoff signal will be output after the CO concentration exceeds a predetermined level before the cutoff signal is output. The elapsed time until the CO concentration falls below the predetermined level after being output, or until the CO concentration falls below the predetermined level after the cutoff signal is output after the CO concentration exceeds the predetermined level before the cutoff signal is output The integrated value of the CO concentration may be a value corresponding to COHb when the CO concentration falls below a predetermined level after the cutoff signal is output. In this case, a table of the elapsed time or the integrated value of the CO concentration and the COHb when the CO concentration falls below a predetermined level after the cutoff signal is output is stored in advance in the ROM 12B. Then, COHb at the time when the CO concentration falls below a predetermined level after the cutoff signal is output from the accumulated value of the elapsed time and CO concentration obtained using this table is obtained, and the obtained COHb is substituted into equation (3). It is also conceivable to set the decay time T _A obtained in this way as the delay time T _D.

  In the above-described embodiment, the alarm device outputs the cutoff signal and the release signal to the gas meter as an external device, but the present invention is not limited to this. For example, it is also conceivable to output a cutoff signal and a release signal to a gas water heater as an external device.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a circuit diagram which shows one Embodiment of the alarm device which implemented the cancellation | release method of this invention. It is a log-log graph which shows the relationship between CO concentration in oxygen concentration 20%, and the arrival time until COHb becomes 20%. It is a time chart which shows the relationship between CO density | concentration and a reciprocal number and a time product. It is a graph which shows the relationship of COHb with respect to the elapsed time after CO density | concentration becomes substantially 0 after COHb reaches 5%, 10%, 15%, 20%, 25%, 30%. It is a graph which shows the relationship of time until COHb with respect to COHb falls below 1%, 2%, 5%, 10%. It is a flowchart which shows the process sequence of CPU which comprises the alarm device shown in FIG.

Explanation of symbols

10 Gas sensor 12A CPU (abnormality detection means, combustion stop means, delay time determination means, release means, integration means)
12B ROM (storage means)

Claims (3)

A gas sensor for detecting a carbon monoxide concentration, and based on the carbon monoxide concentration detected by the gas sensor from the time when the carbon monoxide concentration detected by the gas sensor exceeds a predetermined level to the present time , Abnormality detection means for detecting that the occurrence has reached an alarm level, and combustion stop means for stopping the combustion of the gas combustion appliance when the occurrence of carbon monoxide is detected to have reached the alarm level by the abnormality detection means In an alarm device comprising:
One combustion stop by the combustion stop means is detected by the gas sensor the detected concentration of carbon monoxide by the gas sensor from exceeding a predetermined level before, after combustion stop by the combustion stop means is made to be performed Delay time determination for determining a delay time corresponding to a carbon monoxide hemoglobin concentration in blood accumulated until the carbon oxide concentration falls below the predetermined level, or a value corresponding to the carbon monoxide hemoglobin concentration. Means,
Combustion of the gas combustion appliance after the lapse of the delay time determined by the delay time determining means after the carbon monoxide concentration detected by the gas sensor falls below the predetermined level after the combustion stop by the combustion stop means is performed. Release means for releasing the stop,
An alarm device comprising: Storage means for storing in advance the relationship between the carbon monoxide concentration in the predetermined oxygen concentration and the arrival time until the carbon monoxide hemoglobin concentration in the blood reaches the alarm value;
The reciprocal of the arrival time corresponding to the carbon monoxide concentration detected by the gas sensor from the time when the carbon monoxide concentration detected by the gas sensor exceeds the predetermined level from the relationship stored in the storage means. Integrating means for obtaining a time product of
When the time product of the reciprocal of the arrival time obtained by the integration means exceeds the threshold value, the abnormality detection means reaches the alarm value when the carbon monoxide hemoglobin concentration reaches the alarm level. Is set to detect that
The delay time determining means performs integration by the integrating means after the combustion stop by the combustion stopping means is performed until the carbon monoxide concentration detected by the gas sensor falls below the predetermined level, and the predetermined level is set. The time product of the reciprocal of the arrival time obtained by the integration means when the value is lower is set to determine the delay time corresponding to the time product of the reciprocal of the arrival time as a value corresponding to the carbon monoxide hemoglobin concentration The alarm device according to claim 1, wherein the alarm device is provided. Generation of carbon monoxide based on a gas sensor for detecting a carbon monoxide concentration and the carbon monoxide concentration detected by the gas sensor from the time when the carbon monoxide concentration detected by the gas sensor exceeds a predetermined level to the present time An abnormality detecting means for detecting that the alarm level has been reached, and a combustion stopping means for stopping the combustion of the gas combustion appliance when the abnormality detecting means detects that the generation of carbon monoxide has reached the alarm level; In a release method for releasing the combustion stop of the gas combustion appliance by an alarm device comprising:
One combustion stop by the combustion stop means is detected by the gas sensor the detected concentration of carbon monoxide by the gas sensor from exceeding a predetermined level before, after combustion stop by the combustion stop means is made to be performed Determining a delay time corresponding to a carbon monoxide hemoglobin concentration in blood accumulated until the carbon oxide concentration falls below the predetermined level, or a value corresponding to the carbon monoxide hemoglobin concentration;
The combustion stop of the gas combustion appliance is released after the lapse of the delay time determined by the step after the carbon monoxide concentration detected by the gas sensor falls below the predetermined level after the combustion stop by the combustion stop means is performed. And a process of
The release method characterized by performing sequentially.

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