JPH028656B2 - - Google Patents
Info
- Publication number
- JPH028656B2 JPH028656B2 JP17778183A JP17778183A JPH028656B2 JP H028656 B2 JPH028656 B2 JP H028656B2 JP 17778183 A JP17778183 A JP 17778183A JP 17778183 A JP17778183 A JP 17778183A JP H028656 B2 JPH028656 B2 JP H028656B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- frequency
- voltage
- alarm
- concentration
- 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
- 238000001514 detection method Methods 0.000 claims description 14
- 239000003086 colorant Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 50
- 239000010949 copper Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000005566 electron beam evaporation Methods 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 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
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital using a threshold to release an alarm or displaying means
Description
【発明の詳細な説明】
本発明は漏れたガスの濃度に応じて警報表示部
の色が変化するガス漏れ警報装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leak alarm device in which the color of an alarm display section changes depending on the concentration of leaked gas.
近年、ガス爆発が多発し、ガス警報装置にてガ
ス漏れを警報し、ガス爆発を未然に防止する傾向
にある。従来のガス漏れ警報装置は漏れたガス濃
度がある所定値を越えるとブザーやパイロツトラ
ンプ等で警報を行つている。そのため、警報装置
が作動しても漏れているガス濃度すなわち爆発等
を引き越す危険度がわからず、例えば小量のガス
漏れであつても警報器が作動したことによりあわ
てて対処したり、一方大量のガス濃度であつても
大事には至らないと考え迅速に対処せず危険を招
いたりする。これは、ガス濃度の大小が検知者に
判断出来ないためであり、警報器の作動によりあ
わて、冷静な判断が出来ないという問題がある。 In recent years, gas explosions have occurred frequently, and there is a trend to prevent gas explosions by using gas alarm devices to warn of gas leaks. Conventional gas leak alarm devices issue an alarm using a buzzer, pilot lamp, etc. when the concentration of leaked gas exceeds a certain predetermined value. Therefore, even if the alarm is activated, the concentration of the leaking gas, that is, the risk of an explosion, etc., is not known, and even if the alarm is activated, for example, even a small amount of gas leaks, people may have to deal with it hurriedly. Even if there is a large concentration of gas, they think that it will not cause any serious problems and do not take prompt action, resulting in danger. This is because the detector cannot judge the magnitude of the gas concentration, and there is a problem in that the detector is flustered by the activation of the alarm and cannot make a calm judgment.
本発明は上記事情に基づいてなされたものであ
り、ガス漏れ警報装置が作動するとガス濃度に応
じて警報表示部の色が変化して、検知者がガス濃
度を把握することができるため、迅速かつ適切な
対処を取り得るガス漏れ警報装置を提供すること
を目的とするものである。 The present invention was made based on the above circumstances, and when the gas leak alarm device is activated, the color of the alarm display changes according to the gas concentration, allowing the detector to quickly grasp the gas concentration. It is an object of the present invention to provide a gas leak alarm device that can take appropriate measures.
以下添付図面に基づいて本発明の一実施例を詳
述する。 An embodiment of the present invention will be described in detail below based on the accompanying drawings.
第１図は本発明のガス漏れ警報装置のブロツク
図であり、１はガス漏れを検出しガス濃度に応じ
た信号を発生するガス検出部、２は上記信号に基
づく電圧を周波数に変換する電圧−周波数変換
器、３は後述する警報表示部４を駆動させる表示
部駆動回路、４は前記周波数を含む交流電圧によ
つて駆動し、周波数の変化によつて発光色が異な
り、ガス濃度の大小を認識できる警報表示部であ
る。 FIG. 1 is a block diagram of the gas leak alarm device of the present invention, in which 1 is a gas detection unit that detects gas leaks and generates a signal according to the gas concentration, and 2 is a voltage that converts the voltage based on the signal into a frequency. - Frequency converter, 3 is a display drive circuit that drives an alarm display 4, which will be described later; 4 is driven by an alternating current voltage that includes the frequency, and the color of the emitted light varies depending on the frequency, and the gas concentration varies; This is an alarm display section that allows you to recognize.
ガス検出部１はガス漏れがあつた場合、それを
検知する検知素子を備えており、この検知素子
は、一酸化炭素、プロパン、メタン、都市ガス等
の還元性気体と接触することによりその電気的抵
抗値が減小する還元型半導体を使用しており、例
えばプロパン（C3H8）と接触することにより上
記抵抗値が第２図に示すように変化するものであ
る。なおこのような特性を有する検知素子として
は周知のもの（たとえば実公昭54−17435号公報
や実公昭56−16540号公報等）を使用すればよい
ので詳細は省略する。 The gas detection unit 1 is equipped with a detection element that detects gas leakage when there is a gas leak, and this detection element releases electricity by contacting with reducing gases such as carbon monoxide, propane, methane, and city gas. A reduced type semiconductor whose physical resistance value decreases is used, and the resistance value changes as shown in FIG. 2 when it comes into contact with, for example, propane (C 3 H 8 ). As a detection element having such characteristics, a well-known detection element (for example, Japanese Utility Model Publication No. 17435/1983, Japanese Utility Model Publication No. 16540/1983, etc.) may be used, so the details thereof will be omitted.
電圧−周波数変換器（以下Ｖ−ｆ変換器と云
う）２は例えば第３図に示す周知の回路によつて
構成される。図中、A1は積分器、A2はコンパレ
ータである。Ｖ−ｆ変換器２の入力電圧V1は例
えば前記検知素子５と抵抗６と電源Ｅとの直列回
路７を構成した場合において上記抵抗６の端子間
電圧とする。このようにすればガス検出部１のガ
ス濃度に応じた信号に基づく電圧をＶ−ｆ変換器
２へ供給できる。このＶ−ｆ変換器２において、
入力電圧V1によつてコンデンサC1が充電され、
積分器A1の出力が下がつてくる。コンパレータ
A2はその入力端子の電圧を基準にして積分器
A1の出力を他の入力端子より入力し比較する。
そして積分器A1の出力によつてコンパレータA2
の端子が端子の電圧を下回るとコンパレータ
A2の出力は上がりトランジスタTrはオンする。
次にコンデンサC1の電荷が放電されるとコンパ
レータA2の出力が下がり、トランジスタTrはオ
フし、コンデンサC1は再び入力電圧V1により充
電される。このＶ−ｆ変換器２において積分器
A1、コンパレータA2の出力はそれぞれ第４図に
示すようにノコギリ波、パルス波となる。このパ
ルス波の周波数ｆは
ｆ＝１／V2・V1／R1・１／C1 ………(1)
として表わされる。そして、この周波数ｆを含む
交流電圧V2が表示駆動回路３で所定のレベル設
定が行なわれ警報表示部４へ出力される。 The voltage-frequency converter (hereinafter referred to as a V-f converter) 2 is constituted by a well-known circuit shown in FIG. 3, for example. In the figure, A 1 is an integrator and A 2 is a comparator. The input voltage V 1 of the Vf converter 2 is, for example, the voltage between the terminals of the resistor 6 in the case where a series circuit 7 of the detecting element 5, the resistor 6, and the power source E is configured. In this way, a voltage based on a signal corresponding to the gas concentration of the gas detection section 1 can be supplied to the Vf converter 2. In this V-f converter 2,
The input voltage V 1 charges the capacitor C 1 ,
The output of integrator A1 begins to decrease. comparator
A 2 is an integrator with reference to the voltage at its input terminal.
Input the output of A1 from other input terminals and compare.
And by the output of integrator A 1 comparator A 2
When the terminal of is below the voltage of the terminal, the comparator
The output of A2 increases and transistor Tr turns on.
Next, when the charge in the capacitor C1 is discharged, the output of the comparator A2 falls, the transistor Tr is turned off, and the capacitor C1 is charged again by the input voltage V1 . In this V-f converter 2, an integrator
The outputs of A 1 and comparator A 2 are a sawtooth wave and a pulse wave, respectively, as shown in FIG. The frequency f of this pulse wave is expressed as f=1/V 2 ·V 1 /R 1 ·1/C 1 (1). Then, the AC voltage V 2 including this frequency f is set at a predetermined level in the display drive circuit 3 and output to the alarm display section 4 .
警報表示部４は電界発光表示素子（以下ELと
云う）をその前面に備えている。EL８は第５図
に示すように表示面を構成する透明なガラス基板
９、ガラス基板９上に電極材料として酸化スズを
膜厚約2000Åに電子ビーム蒸着法により成膜し、
熱処理を施して形成した透明電極１０、発光中心
を形成する活性材料として銅（Cu）を母体材料
である硫化亜鉛粉末（ZuS）に添加し高誘電率を
有する誘電体中に分散させ生成したものを膜厚約
10μｍにシルクスクリーン法により形成した蛍光
層１１、蛍光層１１上にアルミニウムを膜厚約
2000Åに電子ビーム蒸着法によつて形成した反射
性を有する金属背面電極１２によつて構成されて
いる。このEL８は電圧を印加することにより蛍
光層１１が電界発光するもので、印加される交流
電圧の周波数によつてその発光色が変化する。第
６図は上記構成によるEL８の発光スペクトルを
表わし、周波数50Hzでは530μｍ付近にピークを
持つ緑色成分の強い発光、又1000Hzでは450μｍ
付近にピークを持つ青色成分の強い発光となつて
いる。 The alarm display section 4 includes an electroluminescent display element (hereinafter referred to as EL) on its front surface. As shown in FIG. 5, EL8 is made by forming a film of tin oxide as an electrode material on a transparent glass substrate 9 forming a display surface to a thickness of about 2000 Å by electron beam evaporation.
Transparent electrode 10 formed by heat treatment, produced by adding copper (Cu) as an active material to form a luminescent center to zinc sulfide powder (ZuS) as a base material and dispersing it in a dielectric material having a high dielectric constant. The film thickness is approx.
The fluorescent layer 11 was formed to a thickness of 10 μm using a silk screen method, and the aluminum film was coated on the fluorescent layer 11 to a thickness of about 10 μm.
It is composed of a reflective metal back electrode 12 formed to a thickness of 2000 Å by electron beam evaporation. In this EL8, the fluorescent layer 11 emits electroluminescence when a voltage is applied, and the color of the emitted light changes depending on the frequency of the applied alternating current voltage. Figure 6 shows the emission spectrum of EL8 with the above configuration.At a frequency of 50Hz, the emission has a strong green component with a peak around 530μm, and at a frequency of 1000Hz, it emits light at 450μm.
The emission has a strong blue component with a peak nearby.
次に上記構成による本発明の動作を説明する。 Next, the operation of the present invention with the above configuration will be explained.
先ず、ガスが漏れるとガス検出部１内の検知素
子５の抵抗値がガス濃度の上昇に伴なつて減少す
る。検知素子の抵抗値の減少に伴ない抵抗６の端
子間電圧V1が大きくなる。前記(1)式より抵抗R1、
コンデンサC1、出力電圧V2が一定であれば入力
電圧V1が大きくなるに伴ない周波数ｆも大きく
なる。この周波数ｆを含む交流電圧が表示部駆動
回路３を介して警報表示部４へ印加される。この
警報表示部４に設けたEL８は周波数に依存して
その発光色が変化する。すなわち、周波数の増加
に伴ない発光色は緑から青へ変化する。尚、ガス
が漏れていない正常の場合には常にEL８が緑色
で発光され（周波数約50Hz）かつガスが漏れてそ
の最大濃度例えば１％で青色で発光される（周波
数約1000Hz）ように(1)式において抵抗R1、コン
デンサC1を設定すればガス濃度に応じてEL８が
アナログ的に緑から青に変化する。このため検知
者は色を観て漏れているガス濃度を認識できるた
め、ガス濃度に応じて迅速かつ適切な対処が可能
となる。尚、EL８の付近にガス濃度を示す色見
本シール等を貼つておけば、EL８の発光色と色
見本シールを比較してより正確にガス濃度を認識
できる。又、ガスが漏れていない正常な場合には
常にEL８が緑色に発光しているため、警報装置
が断線等して正常に動作しない等の不安感を抱く
ことがない。 First, when gas leaks, the resistance value of the sensing element 5 in the gas detection section 1 decreases as the gas concentration increases. As the resistance value of the sensing element decreases, the voltage V 1 between the terminals of the resistor 6 increases. From the above formula (1), the resistance R 1 ,
If the capacitor C 1 and the output voltage V 2 are constant, the frequency f also increases as the input voltage V 1 increases. An AC voltage including this frequency f is applied to the alarm display section 4 via the display section drive circuit 3. The EL 8 provided in this alarm display section 4 changes its emitted light color depending on the frequency. That is, the color of the emitted light changes from green to blue as the frequency increases. In addition, in the normal case where there is no gas leaking, EL8 always emits green light (frequency of about 50Hz), and when gas leaks and its maximum concentration is 1%, it emits blue light (frequency of about 1000Hz) (1 ), if the resistor R 1 and capacitor C 1 are set, EL8 changes from green to blue in an analog manner depending on the gas concentration. Therefore, the detector can recognize the leaking gas concentration by looking at the color, and can take prompt and appropriate measures depending on the gas concentration. If a color sample sticker indicating the gas concentration is pasted near the EL8, the gas concentration can be more accurately recognized by comparing the emitted color of the EL8 with the color sample sticker. In addition, since the EL8 always emits green light when there is no gas leakage and there is no gas leakage, there is no fear that the alarm device will not operate normally due to disconnection or the like.
第７図はガス漏れ警報装置の例えば前面に設け
られたEL８の色変化を示したグラフで、EL８は
正常時Ａで緑色に発光し、漏れたガス濃度が上昇
するにつれ、Ｂ→Ｃと青色成分をより多く含んで
発光し、Ｄで例えばガス濃度が１％になると青色
に発光する。このようなアナログによる段階的な
表示が可能となる。 Figure 7 is a graph showing the color change of EL8, which is installed on the front side of a gas leak alarm device. EL8 emits green light at A during normal operation, and changes from B to C as the concentration of leaked gas increases. It emits light when it contains more components, and when the gas concentration reaches 1% in D, for example, it emits blue light. This kind of analog step-by-step display becomes possible.
以上本発明の一実施例について詳述したが、本
発明は他の実施例をも包含できる。 Although one embodiment of the present invention has been described above in detail, the present invention may include other embodiments.
例えば、前記実施例では、検知素子として還元
型半導体を用いたが周知な熱線式の検知素子を用
いても良い。又、警報表示部に用いるELも銅
（Cu）を活性材料として用いるものの他に銀、銅
を用いるもの（ZnS：Ag、Cu）や銀、塩素、銅
を用いるもの（ZnS：Ag、Cl、Cu）であつても
同様の発光動作を得ることができる。さらに、他
の警報手段としてブザー等の聴覚方法を伴用すれ
ば一層警報手段として有効である。 For example, in the embodiment described above, a reduced semiconductor is used as the detection element, but a well-known hot wire type detection element may also be used. Furthermore, in addition to the EL used for alarm display parts, in addition to those that use copper (Cu) as an active material, there are also those that use silver and copper (ZnS: Ag, Cu) and those that use silver, chlorine, and copper (ZnS: Ag, Cl, Similar light emitting behavior can be obtained even with Cu). Furthermore, if an auditory method such as a buzzer is used as another alarm means, it will be even more effective as an alarm means.
なお、第８図はEL８の印加電圧の大きさと発
光の明るさの強さとの実験結果を表わしており、
印加電圧の大きさを一定したとき、印加電圧の周
波数に応じて発光の明るさの強さに差が生じるこ
とが分かる。これより、ガス濃度に応じてEL８
の印加電圧の周波数を変える場合、印加電圧の大
きさも同時に変化させる構成、すなわち周波数が
高くなるにつれて印加電圧を低くすることによ
り、EL８の発光の強さがさほど大きく変わらず、
使用者に違和感を与えにくくすることができる。 Furthermore, Figure 8 shows the experimental results of the magnitude of the applied voltage and the intensity of the luminescence brightness of EL8.
It can be seen that when the magnitude of the applied voltage is kept constant, the intensity of the brightness of the emitted light varies depending on the frequency of the applied voltage. From this, depending on the gas concentration, EL8
When changing the frequency of the applied voltage, by simultaneously changing the magnitude of the applied voltage, that is, by lowering the applied voltage as the frequency increases, the intensity of the light emission from EL8 does not change significantly.
This can make it difficult for the user to feel uncomfortable.
以上詳述したように本発明によれば警報表示部
にELを設けたことにより、ガス濃度に応じて発
光色が変化するため、検知者がガス濃度を把握し
かつ爆発等の危険度を認識できるため、迅速かつ
適切な対処を取り得るガス漏れ警報装置を提供す
ることができる。 As detailed above, according to the present invention, by providing an EL in the alarm display section, the emitted light color changes depending on the gas concentration, so the detector can grasp the gas concentration and recognize the degree of danger such as explosion. Therefore, it is possible to provide a gas leak alarm device that can take prompt and appropriate measures.
第１図は本発明の一実施例であるガス漏れ警報
装置のブロツク図、第２図は検知素子の抵抗値一
ガス濃度特性、第３図はＶ−ｆ変換器の一実施例
である電気回路図、第４図は同回路の出力波形
図、第５図はELの断面図、第６図はELの発光ス
ペクトル、第７図はELの発光色の遷移を示すグ
ラフ、第８図はELの電圧−輝度特性図である。
１……ガス検出部、２……Ｖ−ｆ変換器、４…
…警報表示部、５……検知素子、８……EL。
Fig. 1 is a block diagram of a gas leak alarm device which is an embodiment of the present invention, Fig. 2 is a resistance value-gas concentration characteristic of a detection element, and Fig. 3 is an electrical diagram which is an embodiment of a V-f converter. The circuit diagram, Fig. 4 is the output waveform diagram of the circuit, Fig. 5 is a cross-sectional view of the EL, Fig. 6 is the emission spectrum of the EL, Fig. 7 is a graph showing the transition of the emission color of the EL, and Fig. 8 is the graph showing the transition of the emission color of the EL. It is a voltage-luminance characteristic diagram of EL. 1... Gas detection section, 2... V-f converter, 4...
...Alarm display section, 5...Detection element, 8...EL.
Claims (1)
生するガス検出部と、この信号に基づく電圧を周
波数に変換する電圧−周波数変換器と、前記周波
数を含む交流電圧により駆動し、ガス濃度に応じ
た周波数の変化により発光色が異なる警報表示部
とを備えたことを特徴とするガス漏れ警報装置。1. A gas detection unit that detects gas leakage and generates a signal according to the gas concentration; a voltage-frequency converter that converts the voltage based on this signal into a frequency; and a voltage-frequency converter that is driven by an alternating current voltage that includes the frequency, and 1. A gas leak alarm device comprising: an alarm display unit that emits light in different colors depending on a change in frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17778183A JPS6069543A (en) | 1983-09-26 | 1983-09-26 | Warning device for gas leak |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17778183A JPS6069543A (en) | 1983-09-26 | 1983-09-26 | Warning device for gas leak |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6069543A JPS6069543A (en) | 1985-04-20 |
| JPH028656B2 true JPH028656B2 (en) | 1990-02-26 |
Family
ID=16036993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17778183A Granted JPS6069543A (en) | 1983-09-26 | 1983-09-26 | Warning device for gas leak |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6069543A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6417459U (en) * | 1987-07-22 | 1989-01-27 | ||
| WO2006097114A1 (en) * | 2005-03-16 | 2006-09-21 | Mohamed Rejdal | Automated device for protecting and fighting against gas leakage |
| JP4750484B2 (en) * | 2005-06-30 | 2011-08-17 | 新コスモス電機株式会社 | Gas detector |
| EP3794339A1 (en) | 2018-05-17 | 2021-03-24 | ams International AG | Sensor arrangement and method for sensor measurement |
| CN111599138A (en) * | 2020-06-22 | 2020-08-28 | 山东恒光电子科技有限公司 | Dual remote-transmission combustible gas on-line monitoring alarm system |
-
1983
- 1983-09-26 JP JP17778183A patent/JPS6069543A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6069543A (en) | 1985-04-20 |
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