JPH0128901B2 - - Google Patents
Info
- Publication number
- JPH0128901B2 JPH0128901B2 JP56021396A JP2139681A JPH0128901B2 JP H0128901 B2 JPH0128901 B2 JP H0128901B2 JP 56021396 A JP56021396 A JP 56021396A JP 2139681 A JP2139681 A JP 2139681A JP H0128901 B2 JPH0128901 B2 JP H0128901B2
- Authority
- JP
- Japan
- Prior art keywords
- alarm circuit
- gas sensor
- alarm
- voltage comparator
- control element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000007423 decrease Effects 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 230000004397 blinking Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、屋内等でガス漏れが生じた時は勿論
のことガスセンサーの線路断線時、接触不良時、
ヒーター断線時にも警報を発するようにしたガス
漏れ警報器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is useful not only when a gas leak occurs indoors, but also when a line of a gas sensor is disconnected, there is a poor contact,
This invention relates to a gas leak alarm that issues an alarm even when a heater is disconnected.
半導体式ガスセンサーを設けた従来のガス漏れ
警報器においては、ガスセンサーの線路が断線し
たりセンサー内部で接触不良が生じたりヒーター
が断線したりした場合にはガス漏れが生じてもこ
れを検出することは不可能であり十分なガス漏れ
警報器とは言えなかつた。
Conventional gas leak alarms equipped with semiconductor gas sensors cannot detect gas leaks if the gas sensor line is disconnected, there is a poor contact inside the sensor, or the heater is disconnected. It was impossible to do so, and it could not be said to be a sufficient gas leak alarm.
そこで、このような欠点を解消するために、例
えば特開昭53−114394号公報に示されるように通
常のガス漏れ警告機能に加えガスセンサーの異常
状態を検出し警告することが提案されている。 Therefore, in order to eliminate these drawbacks, it has been proposed, for example, as shown in Japanese Patent Application Laid-Open No. 53-114394, to detect and issue a warning in addition to the normal gas leak warning function. .
このものは、正常時には警告用の作動表示灯を
点灯したままとしガス漏れ検出時には作動表示灯
を点滅させ、ガスセンサー異常時には滅灯させる
ように、１つの作動表示灯の点灯モードを切り換
えることにより、異なる状態を警告するように構
成されている。 This device switches the lighting mode of one operation indicator light so that the warning operation indicator light remains lit during normal conditions, blinks when a gas leak is detected, and turns off when the gas sensor is abnormal. , configured to alert you to different conditions.
このものによれば構成は簡単になる反面、使用
者は表示灯のモードが点灯、点滅、消灯のどのモ
ードであるのかを若干時間注視し、その後判断し
なければならず、ガス漏れ等に対する緊急を要す
る対策を施すタイミングを逸し易いものである。
Although this method simplifies the configuration, the user has to keep an eye on whether the indicator light is on, blinking, or off for a while, and then make a decision, and in case of an emergency such as a gas leak, etc. It is easy to miss the timing to take necessary measures.
本発明はこのような事情を鑑みて成されたもの
で、ガスの濃度によつて抵抗値が変化するガスセ
ンサーと、前記ガスセンサーの抵抗変化による電
圧変化を検出する第１の電圧比較器と、この第１
の電圧比較器の出力によつて作動し第１の警報回
路を駆動させる第１の制御素子と、ガスセンサー
の異状出力低下状態を検出する第２の電圧比較器
とこの第２の電圧比較器の出力によつて作動し第
２の警報回路を駆動させる第２の制御素子とを備
え、該第２の警報回路の駆動時に前記第１の警報
回路も駆動するように第１の警報回路と第２の警
報回路との間を一方向制御素子で接続したもので
ある。
The present invention has been made in view of the above circumstances, and includes a gas sensor whose resistance value changes depending on the concentration of gas, a first voltage comparator that detects a voltage change due to a change in the resistance of the gas sensor. , this first
a first control element that is activated by the output of the voltage comparator to drive the first alarm circuit; a second voltage comparator that detects an abnormal output decrease state of the gas sensor; and the second voltage comparator. a second control element that is activated by the output of the second alarm circuit to drive the second alarm circuit, and the first alarm circuit is configured such that the first alarm circuit is also driven when the second alarm circuit is driven. A one-way control element is connected to the second alarm circuit.
室内等の設置個所でガス漏れ事故が発生した場
合、ガスセンサーの抵抗値が減少しガスセンサー
の両端に発生する電圧が変化する。この電圧変化
を第１の電圧比較器で検出し、その出力信号によ
つて第１の制御素子が作動し第１の警報回路が駆
動することによつて警報が行われる。
If a gas leak occurs at a location where the gas sensor is installed, such as indoors, the resistance value of the gas sensor decreases and the voltage generated across the gas sensor changes. This voltage change is detected by the first voltage comparator, and the first control element is actuated by the output signal thereof, and the first alarm circuit is driven, thereby issuing an alarm.
次に何らかの事情によつて、例えばガスセンサ
ー内のヒーターの断線、ヒーターへの電力供給ス
トツプ等の異常がガスセンサーに発生した場合、
ガスセンサーの出力は低下するため、これを第２
の電圧比較器で検出し、その出力信号によつて第
２の制御素子を作動させ、これによつて第２の警
報回路が駆動する。 Next, if for some reason an abnormality occurs in the gas sensor, such as a disconnection of the heater in the gas sensor or a stop in the power supply to the heater,
Since the output of the gas sensor decreases, this is
A second control element is activated by the output signal of the voltage comparator, thereby driving a second alarm circuit.
このとき、第１の警報回路と第２の警報回路と
の間を一方向制御素子で接続しているため、第２
の警報回路が駆動すると同時に第１の警報回路も
駆動し、こうしてガスセンサー自体に異常が生じ
ると両方の警報が行われ使用者は、事故がガス漏
れであるか、ガスセンサーの異常であるかを直ち
に判断対処することができる。 At this time, since the first alarm circuit and the second alarm circuit are connected by a one-way control element, the second alarm circuit
When the first alarm circuit is activated, the first alarm circuit is also activated, and if an abnormality occurs in the gas sensor itself, both alarms will be issued and the user will be able to determine whether the accident is due to a gas leak or an abnormality in the gas sensor. can be judged and dealt with immediately.
また第１の警報回路が駆動したときは、前記一
方向制御素子により第２の警報回路の駆動は阻止
され誤発報を生じることはない。 Furthermore, when the first alarm circuit is activated, the one-way control element prevents the second alarm circuit from being activated, thereby preventing false alarms from occurring.
このように本発明によれば、簡単な構成で２つ
の警報回路間に優先性を与えることができ、特
に、ガスセンサーの異常という基本的な事故に対
しては警報回路を全部駆動させ、使用者に事故が
重大であることを確実に認識させることができ
る。 As described above, according to the present invention, priority can be given between two alarm circuits with a simple configuration, and in particular, in the case of a basic accident such as a gas sensor abnormality, all alarm circuits are activated and used. It is possible to ensure that the person involved in the accident is aware of the seriousness of the accident.
以下本発明の一実施例を図面を用いて説明す
る。図において、直流電源１は定電圧回路２を介
して回路に一定電圧を供給している。ガスセンサ
ー３はガス漏れ検知用の素子であつて、本実施例
においては警報器本体の外部に設けてある。ガス
センサー３はヒーター４、半導体素子５、正側電
極６、負側電極７よりなつていて、線路８、線路
９、線路１０によつて警報器本体に接続されてい
る。ガスセンサー３の出力は抵抗１１の端子電圧
となつて現れるようになつている。抵抗１１の端
子電圧は、第１の電圧比較器１２によつて差動入
力電圧１３（V1）と比較される。また、ガスセ
ンサー３の出力は第２の電圧比較器１４によつて
差動入力電圧１５（V2）と比較される。第１の
電圧比較器１２の出力は、抵抗１６、抵抗１７を
介して第１の制御素子であるトランジスタ１８を
ONし第１の警報回路１９を作動するようになつ
ている。第２の電圧比較器１４の出力は、抵抗２
０、抵抗２１を介して第２の制御素子であるトラ
ンジスタ２２をONし、一方向制御素子２３を介
して警報回路１９を作動し、かつ発光ダイオード
のような第２の警報回路２４を点灯するようにな
つている。抵抗２５、抵抗２６および抵抗２７、
抵抗２８、抵抗２９、ダイオード３０は、それぞ
れ差動入力電圧１３（V1）と差動入力電圧１５
（V2）を設定するためのものである。また、第１
の電圧比較器１２、第２の電圧比較器１４の特性
を十分に発揮させるために抵抗３１および抵抗３
２が設けてある。
An embodiment of the present invention will be described below with reference to the drawings. In the figure, a DC power supply 1 supplies a constant voltage to the circuit via a constant voltage circuit 2. The gas sensor 3 is an element for detecting gas leakage, and in this embodiment is provided outside the alarm main body. The gas sensor 3 consists of a heater 4, a semiconductor element 5, a positive electrode 6, and a negative electrode 7, and is connected to the alarm main body by lines 8, 9, and 10. The output of the gas sensor 3 appears as a terminal voltage of a resistor 11. The terminal voltage of resistor 11 is compared with differential input voltage 13 (V 1 ) by first voltage comparator 12 . Further, the output of the gas sensor 3 is compared with a differential input voltage 15 (V 2 ) by a second voltage comparator 14 . The output of the first voltage comparator 12 is connected to a transistor 18 which is a first control element via a resistor 16 and a resistor 17.
When turned on, the first alarm circuit 19 is activated. The output of the second voltage comparator 14 is the resistor 2
0, turns on the transistor 22 which is the second control element via the resistor 21, activates the alarm circuit 19 via the one-way control element 23, and lights up the second alarm circuit 24 such as a light emitting diode. It's becoming like that. resistor 25, resistor 26 and resistor 27,
The resistor 28, the resistor 29, and the diode 30 are connected to the differential input voltage 13 (V 1 ) and the differential input voltage 15, respectively.
(V 2 ). Also, the first
In order to fully exhibit the characteristics of the voltage comparator 12 and the second voltage comparator 14, the resistor 31 and the resistor 3 are
2 is provided.
この状態においてガスセンサー３に漏洩ガスが
接すると、その抵抗値が低下しガスセンサー３の
半導体素子５を流れる電流が増大する。この増大
した電流によつて、抵抗１１の端子電圧が上昇す
る。この端子電圧が差動入力電圧１３（V1）の
値を越えると、第１の電圧比較器１２の出力電圧
はLowレベルからHighレベルに移り、その結果
トランジスタ１８がONして第１の警報回路１９
が作動する。一方、ガスセンサー３はヒーター４
によつてある温度に加熱されている。この状態に
おいて何らかの原因で線路８、線路９、ヒーター
４の何れかが断線すると、ヒーター４による加熱
が不可能となりガスセンサー３の温度は低下す
る。温度が低下すると半導体素子５の抵抗値が高
くなり半導体素子５を流れる電流が減少する。電
流が減少すると抵抗１１の端子電圧が下がり、そ
の電圧値が予め設定されていた差動入力電圧１５
（V2）より低くなり第２の電圧比較器１４の出力
がLowレベルからHighレベルに移り、その結果
トランジスタ２２がONして第２の警報回路２４
が点灯してこの警報が線路断線時またはヒーター
断線時の警報であることを示す。そして第１の警
報回路１９と第２の警報回路２４との間を一方向
制御素子２３で接続しているため、これと同時
に、第１の警報回路１９が警報する。線路１０が
断線した場合は、抵抗１１の端子電圧は零ボルト
になり線路８、線路９、ヒーター４の断線時と同
様に警報および点灯する。 When leaking gas comes into contact with the gas sensor 3 in this state, its resistance value decreases and the current flowing through the semiconductor element 5 of the gas sensor 3 increases. This increased current causes the terminal voltage of resistor 11 to rise. When this terminal voltage exceeds the value of the differential input voltage 13 (V 1 ), the output voltage of the first voltage comparator 12 shifts from the low level to the high level, and as a result, the transistor 18 turns on and the first alarm is activated. circuit 19
is activated. On the other hand, the gas sensor 3 is connected to the heater 4
is heated to a certain temperature by In this state, if any of the line 8, line 9, or heater 4 is disconnected for some reason, heating by the heater 4 becomes impossible and the temperature of the gas sensor 3 decreases. When the temperature decreases, the resistance value of the semiconductor element 5 increases and the current flowing through the semiconductor element 5 decreases. When the current decreases, the terminal voltage of the resistor 11 decreases, and that voltage value becomes the preset differential input voltage 15.
(V 2 ), the output of the second voltage comparator 14 shifts from Low level to High level, and as a result, the transistor 22 turns on and the second alarm circuit 24
lights up to indicate that this alarm is a line break or heater break alarm. Since the first alarm circuit 19 and the second alarm circuit 24 are connected by the one-way control element 23, the first alarm circuit 19 issues an alarm at the same time. When the line 10 is disconnected, the terminal voltage of the resistor 11 becomes zero volts, and an alarm is issued and the light is lit in the same way as when the lines 8, 9, and heater 4 are disconnected.
上記説明からわかるように、ガスセンサー３の
線路８、線路９、線路１０、ヒーター４のうち少
なくとも一本が断線した場合には、これを第１の
警報回路と第２の警報回路の両者で警報すること
ができる。 As can be seen from the above explanation, when at least one of the line 8, line 9, line 10, and heater 4 of the gas sensor 3 is disconnected, this is detected by both the first alarm circuit and the second alarm circuit. It can be alarmed.
以上詳述したように、本発明によれば、外部に
設けたガスセンサーの線路やセンサー内部のヒー
ター線が断線した場合でも、これを検知し警報す
ることができる。特に本発明によれば２つの警報
回路の間に簡単な構成で優先性を持たせることが
できるので、使用者はその事故状態を確実に判断
することができる。 As described in detail above, according to the present invention, even if the line of the gas sensor provided outside or the heater wire inside the sensor is disconnected, this can be detected and an alarm can be issued. In particular, according to the present invention, priority can be given between the two alarm circuits with a simple configuration, so the user can reliably determine the accident state.
図面は本発明の一実施例を示す回路図である。
３……ガスセンサー、１２……第１の電圧比較
器、１４……第２の電圧比較器、１８……第１の
制御素子としてのトランジスタ、１９……第１の
警報回路、２２……第２の制御素子としてのトラ
ンジスタ、２３……一方向制御素子、２４……第
２の警報回路。
The drawing is a circuit diagram showing an embodiment of the present invention. 3... Gas sensor, 12... First voltage comparator, 14... Second voltage comparator, 18... Transistor as a first control element, 19... First alarm circuit, 22... A transistor as a second control element, 23... one-way control element, 24... second alarm circuit.
Claims (1)
ンサーと、前記ガスセンサーの抵抗変化による電
圧変化を検出する第１の電圧比較器と、この第１
の電圧比較器の出力によつて作動し第１の警報回
路を駆動させる第１の制御素子と、ガスセンサー
の異状出力低下状態を検出する第２の電圧比較器
とこの第２の電圧比較器の出力によつて作動し第
２の警報回路を駆動させる第２の制御素子とを備
え、該第２の警報回路の駆動時に前記第１の警報
回路も駆動するように第１の警報回路と第２の警
報回路との間を一方向制御素子で接続したことを
特徴とするガス漏れ警報器。1 a gas sensor whose resistance value changes depending on the gas concentration; a first voltage comparator that detects a voltage change due to a change in resistance of the gas sensor;
a first control element that is activated by the output of the voltage comparator to drive the first alarm circuit; a second voltage comparator that detects an abnormal output decrease state of the gas sensor; and the second voltage comparator. a second control element that is activated by the output of the second alarm circuit to drive the second alarm circuit, and the first alarm circuit is configured such that the first alarm circuit is also driven when the second alarm circuit is driven. A gas leak alarm, characterized in that it is connected to a second alarm circuit by a one-way control element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56021396A JPS57136153A (en) | 1981-02-18 | 1981-02-18 | Gas leakage warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56021396A JPS57136153A (en) | 1981-02-18 | 1981-02-18 | Gas leakage warning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57136153A JPS57136153A (en) | 1982-08-23 |
| JPH0128901B2 true JPH0128901B2 (en) | 1989-06-06 |
Family
ID=12053891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56021396A Granted JPS57136153A (en) | 1981-02-18 | 1981-02-18 | Gas leakage warning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57136153A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6119756U (en) * | 1984-07-11 | 1986-02-05 | リンナイ株式会社 | Flammable gas detection device |
| JPH067111B2 (en) * | 1986-03-01 | 1994-01-26 | リコ−精器株式会社 | Gas detector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53114394A (en) * | 1977-03-10 | 1978-10-05 | Matsushita Electric Ind Co Ltd | Detector for gas leakage |
-
1981
- 1981-02-18 JP JP56021396A patent/JPS57136153A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53114394A (en) * | 1977-03-10 | 1978-10-05 | Matsushita Electric Ind Co Ltd | Detector for gas leakage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57136153A (en) | 1982-08-23 |
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