JP2002222472A - Fire alarm, fire alarm processing method, and recording medium with fire alarm processing program recorded thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a slave alarm system by evading the alarm loss and wrong alarm of the slave alarm system such as a gas detection part and a smoke detection part by utilizing a temperature detecting element for a main alarm if a temperature detecting element for a slave alarm is out of order. SOLUTION: The alarm 1 is equipped with a heat sensitive type fire detection part 2 and a temperature compensation part 5 which generates a temperature compensating voltage Vc for compensating the temperature of an arbitrary internal circuit and equipped with an abnormality decision means (fault decision part 6d) which decides abnormality of the temperature compensation part. When the abnormality decision means decides abnormality of the temperature compensation part 5, the temperature compensating voltage is generated according to the detection output of the fire detection part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm, and more particularly, to a heat-detection type fire alarm which detects a fire using a temperature detecting element such as a thermistor. In addition to the "main alarm system"), this is a compound alarm device that implements a secondary alarm system such as a gas detection unit with a temperature compensation function and a smoke detection unit with the same function. It relates to a fire alarm intended for improvement.

[0002]

2. Description of the Related Art Generally, a temperature detecting element such as a thermistor is an element that changes a physical characteristic such as a resistance value according to a change in an ambient temperature. A fire is sensed using a sensing element.
That is, the voltage between both ends of the temperature detecting element is taken out as the temperature detecting voltage, and when the temperature detecting voltage falls below the reference voltage corresponding to the environmental temperature at the time of the fire (if it has a negative temperature characteristic), a fire alarm is issued. Today, such an alarm device is a combined alarm device that can detect not only a fire alarm but also gas and smoke, such as a heat-sensing fire alarm system (a main alarm). System), and a compound alarm device incorporating a secondary alarm system such as a gas detection unit or a smoke detection unit is used.

In this type of compound alarm, for example, a gas leak alarm will be described as an example. When an oxidation reaction proceeds with the contact of a combustible gas such as city gas, the resistance value is increased by the reaction heat. The sensor has a characteristic that changes the gas, that is, a so-called gas detection element. The voltage across the gas detection element is taken out as a gas detection voltage Vb (corresponding to the “gas or smoke detection voltage” described in the gist of the invention), When the detection voltage Vb falls below a reference voltage (threshold voltage for gas leak determination) corresponding to the lower-limit gas concentration of explosion, the gas leak is determined. Therefore, a temperature compensation function for correcting (compensating) the gas detection voltage Vb in accordance with the ambient temperature is indispensable because of the temperature dependency, and a dedicated temperature near the gas detection element is required. Intellectual elements are arranged, correction is performed in the gas detection voltage Vb with the detected voltage.

[0004] By the way, the heat-sensing type fire alarm can no longer detect the temperature or only inaccurate temperature can be detected if any trouble occurs in the temperature detecting element. In the former, there is an inconvenience of causing a fire alarm and in the latter, a fire alarm.

[0005] On the other hand, as described above, the combined alarm device has a secondary alarm temperature detecting element in addition to the main alarm temperature detecting element. The present inventors have a temperature sensing element,
When a failure occurs in the temperature detection element for the main alarm, the temperature detection element for the secondary alarm is diverted to solve the above-mentioned inconvenience by using a `` fire alarm, a fire alarm processing method and a fire alarm processing program. '' Storage medium "(Japanese Patent Application No. 20
No. 00-294101) has already been proposed.

[0006] In short, the above-mentioned proposed technique is a fire alarm having a heat detecting type fire detecting unit and a temperature compensating unit for generating a temperature compensating voltage for performing temperature compensation of an arbitrary internal circuit. A main fire determining unit that determines a fire based on the fire detection voltage output from the fire detecting unit, and a sub-fire determining unit that determines a fire based on the temperature compensation voltage. " . According to this, in addition to the main fire determination based on the fire detection voltage, a secondary fire determination based on the temperature compensation voltage is performed. For example, even if a trouble occurs in the detection element of the fire detection unit, the secondary fire determination is performed. As a result, the determination operation can be continued, and unreported and false reports of the fire alarm can be avoided to improve the reliability of the fire alarm.

[0007]

However, in the above-mentioned prior art, when the temperature detection element for the main alarm breaks down, the temperature detection element for the secondary alarm is diverted, and a fire alarm or fire Although it is useful in that false alarms can be avoided, no measures are taken when a failure occurs in the temperature detection element for the secondary alarm, so there is no false alarm in the secondary alarm system, that is, the gas detection unit, smoke detection unit, etc. It is still inadequate in that it cannot avoid false alarms and there is room for improvement.

Accordingly, the present invention provides a method of using a main alarm temperature detecting element in the event of a failure of a secondary alarm temperature detecting element, thereby losing a secondary alarm system such as a gas detecting section or a smoke detecting section. The purpose of the present invention is to avoid information and misinformation, and to improve the reliability of the secondary alarm system.

[0009]

SUMMARY OF THE INVENTION The present invention provides a fire alarm including a heat detecting type fire detecting section and a temperature compensating section for generating a temperature compensating voltage for performing temperature compensation of an arbitrary internal circuit. The apparatus further includes abnormality determination means for determining abnormality of the temperature compensation unit, and when the abnormality determination means determines abnormality of the temperature compensation unit, the temperature compensation voltage is determined based on a detection output of the fire detection unit. It is configured to occur.

According to the present invention, when an abnormality occurs in the temperature compensator, a temperature compensation voltage for performing temperature compensation of an arbitrary internal circuit is generated based on the detection output of the fire detector.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, taking a combined alarm for detecting fire and gas leakage as an example.

FIG. 1 is a diagram showing an example of a combined alarm (hereinafter simply referred to as "alarm"). An alarm device 1 corresponding to the fire alarm device described in the gist of the invention includes a fire detection unit 2 and a gas leak detection unit 3 (“A” described in the gist of the invention) inside a case of any shape attachable to a wall or a ceiling. A central control unit 6 that performs a fire determination process, a gas leak determination process, and the like based on a detection voltage from each detection unit, a lamp drive unit 7 that drives various alarm lamps according to the determination result, A voice warning unit 11 that generates a voice warning according to the determination result and outputs the voice warning to a loudspeaker 12, a power supply unit 13 that supplies power to each unit, and the like are mounted. Here, the illustrated alarm lamps are three types of a power lamp 8, a fire alarm lamp 9, and a gas leak alarm lamp 10, but are not limited thereto. It is sufficient that an appropriate type of alarm lamp corresponding to the type of alarm is provided.

The fire detecting section 2 has a heat detecting type temperature detecting element. That is, as shown in FIG. 2A, the most basic configuration is such that a fixed resistance element 2a and a temperature detection element 2b are connected in series between a power supply voltage E and a ground, and the temperature detection element 2b Is taken out as a temperature detection voltage Va. Temperature sensing element 2
As the element b, for example, a thermistor (official name: a thermal sensible register) can be used among elements whose physical characteristics change with a change in ambient temperature. The resistance value of the thermistor has a temperature dependence, for example, NTC (Negative Temperature Coefficient
This is because the thermistor of the rmistor type has a negative temperature characteristic that the resistance value decreases with increasing temperature.

When an NTC type thermistor is used for the temperature detecting element 2b shown in the figure, the temperature detecting voltage Va exhibits a characteristic that the voltage value (Va) "decreases" with an increase in the ambient temperature. Therefore, the temperature detection voltage Va
However, the occurrence of a fire can be determined when the temperature falls below a reference voltage corresponding to the environmental temperature at the time of the occurrence of the fire (hereinafter, referred to as “fire determination threshold voltage”).

In addition, as temperature detecting elements, there are also temperature-sensitive resistance elements called CTRs (Critical Temperature Resistors), current-collecting infrared sensors, platinum wire thermocouples, and the like.
Various types of infrared photodiodes, thermal fuses (micro-temp) thermo paints, IC temperature sensors, etc. are known, but in essence, elements that change physical properties such as resistance with changes in ambient temperature. If it is,
An appropriate element may be used for the temperature detecting element 2b in consideration of sensitivity, response characteristics, cost, and the like.

On the other hand, the gas leak detector 3 is provided with a gas detector 4
And the temperature compensating unit 5, and the most basic configuration thereof is shown in FIGS. 2 (b) and 2 (c). In FIG. 2 (b), the gas detection unit 4 has a
Fixed resistance element 4a and gas detection element 4b between
(Corresponding to the “detection element” described in the gist of the invention) in series, and the voltage between both ends of the gas detection element 4b is taken out as a gas detection voltage Vb. As the gas detection element 4b, for example, an oxidation reaction type gas detection element can be used among the elements whose physical characteristics change according to a change in the surrounding gas concentration. This sensing element has a characteristic that, when an oxidation reaction proceeds with the contact of a combustible gas such as a city gas, the resistance value changes in a decreasing direction due to the reaction heat. Therefore, the gas detection voltage Vb is Gas leakage can be determined when the voltage falls below a reference voltage equivalent to the explosion lower limit gas concentration (hereinafter referred to as “gas leakage determination threshold voltage”).

Incidentally, the voltage across the gas detecting element 4b (gas detecting voltage Vb) depends on the resistance value of the gas detecting element 4b, and the resistance value has a required temperature characteristic. Correction (temperature compensation) is indispensable. In an extreme case, the gas detection voltage Vb changes due to the flame heat at the time of the fire, and if correction is not performed, a false report of the gas leak is issued even though the gas is not leaking. This is because the initial countermeasures are mistaken. Also, even if you do not anticipate such extreme situations,
For example, it is known that the detection sensitivity becomes low when the ambient temperature is low, and the detection sensitivity tends to be sharp when the ambient temperature is high. In any case, the gas detection element 4b having such temperature dependency is known. In order to properly use, proper temperature correction (compensation) is indispensable.

The temperature compensator 5 is a component for generating a temperature compensation voltage Vc required for the above-mentioned correction (compensation).
That is, the temperature compensator 5 is arranged as close as possible to the gas detection element 4b, and its most basic configuration is fixed between the power supply voltage E and the ground as shown in FIG. The resistance element 5a and the temperature detection element 5b are connected in series, and a voltage between both ends of the temperature detection element 5b is taken out as a temperature compensation voltage Vc. As the temperature detecting element 5b, a thermistor can be used, for example, among the elements whose physical characteristics change with a change in the ambient temperature, similarly to (the temperature detecting element 2b of) the fire detecting unit 2. When an NTC type thermistor is used, the temperature compensation voltage Vc exhibits a characteristic that the voltage value decreases with an increase in the ambient temperature, so that the temperature compensation voltage Vc is used to calculate the gas detection voltage Vb. By performing the temperature correction (compensation), the above-described inconvenience (false notification of gas leak) can be avoided.

It should be noted that the alarm device 1 shown in the figure is provided with a double element (temperature detecting element) for changing a physical characteristic such as a resistance value in accordance with a change in ambient temperature. It is in. In other words, two points, that is, the temperature detecting element 2b of the fire detecting unit 2 and the temperature detecting element 5b of the temperature compensating unit 5 are provided. The present invention has been devised by paying attention to such a point, and is a crucial component that is indispensable for performing an accurate gas leak alarm, and is a pseudo component of the temperature detecting element 5b of the temperature compensating unit 5. A multiplex configuration is realized,
Even if any trouble occurs in the temperature detecting element 5b of the temperature compensating part 5, the temperature correction (compensation) of the gas detection voltage Vb is accurately performed, and as a result, the alarm leak and the false alarm of the gas leak alarm can be avoided to ensure the alarm reliability. It is intended to improve the performance.

Hereinafter, technical matters for achieving this intention will be specifically described with reference to an example in which an NTC type thermistor is used as a temperature detecting element.

FIG. 3 is an internal block diagram of the central control unit 6. The central control unit 6 includes a CPU 21, and a ROM 23 and a RAM 2
4, input port 25, output port 26 and EPROM2
7 (or a battery backup RAM) and the like. The input port 25 converts output voltages (fire detection voltage Va, gas detection voltage Vb, and temperature compensation voltage Vc) from the fire detection unit 2, the gas detection unit 4, and the temperature compensation unit 5 into digital voltages, and CPU 21
Tell The CPU 21 expands the control program stored in the ROM 23 into the RAM 24 and executes the control program while taking in these digital voltages (represented by “Va”, “Vb”, and “Vc” for convenience). A required process defined by the control program, such as a gas leak determination process and a temperature compensation process, is executed, and signals (Da, Db) corresponding to the execution result are output via the output port 26 to each unit (the lamp driving unit 7 or the like). Output to the voice alarm unit 11).

FIG. 4 is a diagram schematically showing a functional block realized by software in the central control unit 6, and this functional block is provided for convenience of explanation.
a, gas leak determination unit 6b (corresponding to "gas leak or smoke determination unit" described in the gist of the invention), gas leak determination correction unit 6c
(Corresponding to the "alternative temperature compensator" described in the gist of the invention), a failure determination unit 6d (corresponding to "abnormality determination means" described in the gist of the invention), and an alarm generator 6e.

The fire judging section 6a compares the fire detection voltage Va with the fire judgment threshold voltage, and judges the occurrence of a fire when the fire detection voltage Va is lower than the fire judgment threshold voltage. Further, the gas leak determination unit 6b compares the gas detection voltage Vb with a threshold voltage for gas leak determination,
When the gas detection voltage Vb is lower than the gas leakage determination threshold voltage, the occurrence of gas leakage is determined.

Further, the gas leak determination and correction section 6c normally compensates the temperature of the gas detection voltage Vb based on the temperature compensation voltage Vc. On the other hand, when the temperature compensation voltage Vc is abnormal, the gas detection voltage Vb is determined based on the fire detection voltage Va. Temperature compensation. Further, the failure determination unit 6d outputs the temperature compensation voltage Vc
And an alarm generator 6e.
Generates a signal (Da) for lighting an appropriate alarm lamp or generates a signal (Db) of an appropriate voice alarm phrase at the time of fire determination or gas leak determination.

In such a configuration, the fire occurrence part 6a
The "fire determination process" is sequentially performed according to, for example, a flowchart shown in FIG. Fire detector 2
In this flowchart, an example in which an NTC-type thermistor is used as the temperature detecting element 2b of FIG.
11) Next, the fetched Va is compared with a predetermined threshold voltage “SL1” (step S12). here,
SL1 corresponds to the above-mentioned "fire determination threshold voltage". NTC for temperature detection element 2b of fire detection unit 2
When a thermistor of the type is used, the output voltage (fire detection voltage Va) of the temperature detection element 2b changes in a decreasing direction due to the heat of the fire, so this SL1 is set to a voltage corresponding to the environmental temperature at the time of fire occurrence. Va ≦ S
When L1 is reached, it is possible to determine the occurrence of a fire and output a fire alarm (step S13).

On the other hand, the "gas leak judging process" of the gas leak judging section 6b is sequentially executed according to, for example, a flowchart shown in FIG. This flowchart taking an example in which an NTC type thermistor is used as the temperature detecting element 5b of the temperature compensating unit 5 first takes in the temperature compensation voltage Vc at that time (step S21), and then takes in the taken-in Vc and a predetermined value. Failure judgment threshold (SL
2) is compared (step S22).

SL2 corresponds to the voltage value of the temperature compensation voltage Vc which cannot be obtained in a normal use environment. For example, when an NTC type thermistor is used for the temperature detection element 5b of the temperature compensation unit 5, If a disconnection fault occurs in the thermistor, the voltage between both ends of the thermistor (temperature compensation voltage Vc) becomes a high value corresponding to the power supply voltage E, and the value corresponding to the power supply voltage E or a value close thereto is set to SL.
It should just be set to 2. Incidentally, when a preferable value of SL2 is presented in terms of temperature, it can be set to a temperature range that cannot be achieved in a normal use environment, for example, about -30 ° C.

In step S22, when Vc ≧ SL2 is not satisfied ("NO" determination), the voltage value of the temperature compensation voltage Vc falls within the value of the normal use environment.
Since the temperature detecting element 5b of the temperature compensating unit 5 is operating normally (no failure has occurred), the gas leak determination process performs the temperature compensation of the gas detecting voltage Vb based on the temperature compensating voltage Vc at that time. I do. On the other hand, if Vc ≧ SL2 in step S22 (determination of “YES”), the voltage value of the temperature compensation voltage Vc is out of the value of the normal use environment, and therefore, the temperature detection element 5b of the temperature compensation unit 5 Is not working properly (a failure has occurred).
In the gas leak determination process, the fire detection voltage Va at that time is used instead of the temperature compensation voltage Vc, and the fire detection voltage Va is used.
, The temperature of the gas detection voltage Vb is compensated.

There are several methods for temperature compensation.
In this flowchart, for example, a temperature correction coefficient (k) is generated using Vc or Va, and Vb is corrected using the temperature correction coefficient (k). That is,
If no failure has occurred in the temperature detecting element 5b of the temperature compensating unit 5, a temperature correction coefficient (k) is generated from the temperature compensation voltage Vc (step S23), and the gas detection voltage Vb is calculated based on the temperature correction coefficient (k). Is corrected (step S24),
If a failure has occurred in the temperature detection element 5b of the temperature compensation unit 5, the fire detection voltage Va is used instead of the temperature compensation voltage Vc.
Is used to generate a temperature correction coefficient (k) (step S2).
7) The gas detection voltage Vb is corrected by the temperature correction coefficient (k) (step S24). In any case, next, the corrected Vb is compared with the gas leak determination threshold voltage (SL3) (step S25), and if Vb ≦ SL3 after the correction, a gas leak alarm is output. (Step S26).

Incidentally, the temperature detecting element 5 of the temperature compensating section 5
If a failure has occurred in b, an alarm for clearly indicating the occurrence of the failure may be output. This failure alarm may be, for example, an alarm mode in which the power supply lamp 8 is blinked, or an alarm mode in which a voice message such as "a failure has occurred in the temperature compensation unit" is output. Good.

As described above, in the present embodiment, when any trouble occurs in the temperature detecting element 5b of the temperature compensating section 5, the temperature detecting element 2 of the fire detecting section 2
The temperature compensation of the gas leak detection voltage Vb can be performed by using the voltage between both ends (fire detection voltage Va) of b as a substitute. Therefore, it is as if the temperature detection element 5b of the temperature compensation unit 5
Can be realized as a multiplexed configuration of the alarm devices, and a remarkable effect that reliability can be greatly improved by avoiding unreported or false reports of gas leak alarms can be obtained. In addition, in order to obtain such an effect, only a part of the software needs to be modified, and there is also obtained a beneficial manufacturing advantage that no increase in the number of parts is required.

Here, when examining the positional relationship between the two temperature detecting elements 2b and 5b inside the alarm 1, the temperature detecting element 5b of the temperature compensator 5 is generally housed inside the case of the alarm 1. The temperature correction coefficient (k) in step S27 in FIG. 6 is a value that takes into account the temperature difference because it is exposed to a relatively higher environmental temperature than the temperature detection element 2b of the fire detection unit 2 located outside the case. Must. For example, according to actual measurements by the present inventors,
The temperature detecting element 5b of the temperature compensating unit 5 is about 10 ° C. lower than the temperature detecting element 2b of the fire detecting unit 2 located outside the case due to the influence of a heat source (for example, a power transformer) inside the alarm device 1. Since it has been confirmed that the temperature correction coefficient (k) is exposed to a high temperature, the temperature correction coefficient (k) in step S27 in FIG. 6 is different from the temperature correction coefficient (k) in step S23 in FIG. ℃)
Must be taken into account.

The method of temperature compensation is not limited to the correction of the gas leak detection voltage Vb performed using the temperature correction coefficient (k). For example, a gas leak determination threshold (SL
3) may be changed. That is, if no failure is determined in step S22 of FIG. 6, gas leakage determination (step S25) is performed using a predetermined gas leakage determination threshold value (SL3), and if a failure is determined, The gas leak determination threshold value (SL3) is changed in consideration of the temperature difference (+ 10 ° C.), and the gas leak determination is performed using the changed gas leak determination threshold value (SL3) (step S25). May be performed. That is, if the predetermined gas leakage determination threshold value (SL3) is a voltage corresponding to X ° C., the gas leakage determination threshold value (SL
3) may be a voltage corresponding to X + α ° C. (α is the above temperature difference). In this case, step S24 of FIG. 6 is unnecessary, and the processing content of step S23 is replaced with “use a predetermined gas leakage determination threshold value (SL3)”, and the processing content of step S27 is replaced with “2. The threshold value for gas leak determination (SL3) is changed in consideration of the environmental temperature difference between the two temperature sensing elements 2b and 5b. "

Further, in the above-described embodiment, the combined alarm having the gas leak detecting section has been described as an example.
For example, it may be a compound alarm provided with a photoelectric smoke detector. The light emitting element of the photoelectric smoke detector also has a temperature dependency in which the light emission luminance changes with the ambient temperature, and a configuration similar to that of FIG. 2C for correcting (compensating) this temperature dependency. This is because the temperature compensating section is provided.

[0035]

According to the present invention, when an abnormality occurs in the temperature compensation unit, a temperature compensation voltage for performing temperature compensation of an arbitrary internal circuit is generated based on the detection output of the fire detection unit. Therefore, for example, even when a trouble such as disconnection occurs in the temperature detecting element of the temperature compensating unit, the temperature compensation voltage for performing temperature compensation of any internal circuit is not lost. As a result, when an arbitrary internal circuit is used as a secondary alarm system such as a gas detection unit or a smoke detection unit, it is possible to avoid unreporting and false alarms of the secondary alarm system, thereby improving the reliability of the secondary alarm system. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a compound alarm device.

FIG. 2 shows a fire detector 2, a gas detector 4, and a temperature compensator 5.
FIG.

FIG. 3 is an internal block diagram of a central control unit 6;

FIG. 4 is a diagram schematically showing functional blocks realized by software in a central control unit 6;

FIG. 5 is a diagram illustrating a flowchart of a fire determination processing program executed by a fire determination unit 6a.

FIG. 6 is a flowchart showing a main part of a gas leak determination processing program executed by a gas leak determination unit 6b.

[Explanation of symbols]

 Va Fire detection voltage Vb Gas detection voltage (gas or smoke detection voltage) Vc Temperature compensation voltage 1 Fire alarm 2 Fire detection unit 3 Gas leak detection unit (any internal circuit) 4 Gas detection unit 4b Gas detection element (detection element) 5 Temperature compensation unit 6a Fire determination unit 6b Gas leak determination unit (gas leak or smoke determination unit) 6c Gas leak determination correction unit (alternate temperature compensation unit) 6d Failure determination unit (abnormality determination unit)

Claims (5)

[Claims] 1. A fire alarm comprising a heat sensing type fire detecting section and a temperature compensating section for generating a temperature compensating voltage for performing temperature compensation of an arbitrary internal circuit. Abnormality detecting means for determining an abnormality, wherein the temperature compensating voltage is generated based on a detection output of the fire detecting section when the abnormality determining means determines an abnormality in the temperature compensating section. Features a fire alarm. 2. The fire alarm according to claim 1, wherein the temperature compensator generates a temperature compensation voltage for compensating a temperature dependency of a detection element of the gas detector or the smoke detector. 3. A fire judging unit for judging a fire based on a fire detection voltage output from a heat detection type fire detection unit; and a gas or smoke detection voltage output from a gas detection unit or a smoke detection unit. A gas leak or smoke determination unit that determines the generation of smoke due to a gas leak or a fire, a temperature compensation unit that outputs a temperature compensation voltage for performing temperature compensation of the gas detection unit or the smoke detection unit, and the temperature compensation unit Abnormality determining means for determining the failure of the temperature compensating section, and when the abnormality determining means determines a failure in the temperature compensating section, the temperature compensating voltage for compensating the temperature of the gas detecting section or the smoke detecting section is changed to the fire. A fire alarm, comprising: an alternative temperature compensator generated based on a detected voltage. 4. A step of judging a fire on the basis of a fire detection voltage output from a heat detection type fire detection unit, and detecting a gas leak based on a gas or smoke detection voltage output from a gas detection unit or a smoke detection unit. Or determining the generation of smoke due to a fire, outputting a temperature compensation voltage for performing temperature compensation of the gas detection unit or the smoke detection unit, and determining an abnormality of the temperature compensation voltage. Generating a temperature compensation voltage for performing temperature compensation of the gas detection unit or the smoke detection unit based on the fire detection voltage when an abnormality of the temperature compensation voltage is determined. Fire alarm handling method. 5. A fire determination unit for determining a fire based on a fire detection voltage output from a heat detection type fire detection unit, and a gas or smoke detection voltage output from a gas detection unit or a smoke detection unit. A gas leak or smoke determination unit that determines the generation of smoke due to a gas leak or a fire, a temperature compensation unit that outputs a temperature compensation voltage for performing temperature compensation of the gas detection unit or the smoke detection unit, and the temperature compensation unit Abnormality determining means for determining the failure of the temperature compensating section, and when the abnormality determining means determines a failure in the temperature compensating section, the temperature compensating voltage for compensating the temperature of the gas detecting section or the smoke detecting section is changed to the fire. A recording medium storing a program for realizing an alternative temperature compensator generated based on a detected voltage.