DK159167B - DEVICE FOR FLAMMABLE GAS DETECTION - Google Patents
DEVICE FOR FLAMMABLE GAS DETECTION Download PDFInfo
- Publication number
- DK159167B DK159167B DK185582A DK185582A DK159167B DK 159167 B DK159167 B DK 159167B DK 185582 A DK185582 A DK 185582A DK 185582 A DK185582 A DK 185582A DK 159167 B DK159167 B DK 159167B
- Authority
- DK
- Denmark
- Prior art keywords
- circuit
- detector element
- gas
- bridge
- gas detection
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Emergency Alarm Devices (AREA)
- Control Of Combustion (AREA)
Description
DK 159167 BDK 159167 B
Opfindelsen angår et apparat til detektering af brændbar gas, og omfattende en modstandsbrokobling, hvor den ene gren udgøres af et detektorelement til gasdetektering og i form af en trådspiral af platinlegering, og 5 en alarmtransducer.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an apparatus for detecting combustible gas, and comprising a resistance bridge coupling, wherein one branch is a gas detector element and in the form of a platinum alloy wire coil, and an alarm transducer.
Fra US-patentskrift nr. 3.221.320 kender man et gasalarmapparat, som omfatter en som modstandsbro udformet kreds til måling af farlig gaskoncentration, og hvor en med målekredsen forbundet oscillatorkreds på forhånd 10 justeres således, at den svinger, når signalet fra målekredsen overstiger den på forhånd bestemte grænse, hvorhos et kredsløb forbinder oscillatorkredsen med en forstærker, der er koblet til en elektromagnetisk alarmgiver, som afgiver et alarmsignal, som svar på det forstær-15 kede signal. To grene af modstandsbrokoblingen udgøres af identiske platinspiraler, hvoraf den ene i fri luft virker som gasdetektorelement og den anden i rør, der indeholder ren luft, virker som kompenseringselement.US Patent No. 3,221,320 discloses a gas alarm apparatus which comprises a circuit designed to measure dangerous gas concentration and wherein an oscillator circuit associated with the measurement circuit is adjusted in advance to oscillate as the signal from the measurement circuit exceeds it. a predetermined limit at which a circuit connects the oscillator circuit to an amplifier coupled to an electromagnetic alarm sensor which produces an alarm signal in response to the amplified signal. Two branches of the resistance bridge coupling are made of identical platinum coils, one of which in the open air acts as a gas detector element and the other in tubes containing clean air acts as a compensating element.
En variabel modstand balancerer brokoblingen. Oscilla-20 torkredsen omfatter en tunneldiode, en kondensator og en induktansspole koblet til en forstærkerspole. Forstærkeren omfatter en kondensator, transistorer, og en udgangstransformer til en højttaler.A variable resistance balances the bridge coupling. The Oscilla-20 drying circuit comprises a tunnel diode, a capacitor and an inductor coil coupled to an amplifier coil. The amplifier includes a capacitor, transistors, and an output transformer for a speaker.
Det er kendt både til industribrug og hjemmebrug 25 af brændbar gas, at høj driftssikkerhed er af meget stor betydning, eftersom det er nødvendigt mest muligt at nedsætte mulighederne for lækage og tilhørende risiko for brand og skader på udstyr og/eller personer, eftersom de brændbare gasser ofte er meget toksiske.It is known both for industrial and domestic use of combustible gas that high reliability is of great importance as it is necessary to reduce the potential for leakage and associated risk of fire and damage to equipment and / or persons, since the combustible Gases are often very toxic.
30 Apparatet ifølge opfindelsen adskiller sig fra den indledningsvis angivne, kendte teknik ved, at der til brokoblingen er sluttet en første kreds, der virker som differensforstærker med regulerbar tærskel og som er indrettet til at arbejde på grundlag af den ubalance, 35 der forekommer mellem klemmerne på nævnte første kreds, når mængden af gas omkring detektorelementet overstiger den på forhånd fastsatte grænse, for at igangsætte funk-The apparatus according to the invention differs from the prior art, in that a first circuit which acts as an adjustable threshold differential amplifier and which is adapted to operate on the basis of the imbalance occurring between the terminals is connected to the bridge coupling. on said first circuit, when the amount of gas around the detector element exceeds the predetermined limit, to initiate the function.
DK 159167BDK 159167B
2 tionen af en anden kreds, som er indrettet til at virke som lavfrekvensoscillator og til at aktivere alarmtransduceren.2 shows another circuit designed to act as a low frequency oscillator and to activate the alarm transducer.
Er således udformet detekteringsapparat besidder 5 en række fordele. En første fordel ligger i, at brokoblingen, netop fordi den virker med en differensforstær-kerkreds, sikrer en høj følsomhed og giver desuden mulighed for ændring, af detektorapparatets aktiveringstærskel og dermed udvidelse af værdiområdet for følsom-10 hed.Thus, the design apparatus 5 has a number of advantages. A first advantage lies in the fact that the bridge coupling, precisely because it operates with a differential amplifier circuit, ensures a high sensitivity and also allows for the change of the detector device's activation threshold and thus the extension of the range of sensitivity.
En anden fordel ligger i, at brokoblingen - sammenlignet med den kendte teknik - kun har én enkelt platinspiral, der danner detektorelementet, hvilket repræsenterer en væsentlig forenkling af kredsløbsudformning 15 og sikrer dermed en højere pålidelighed.Another advantage is that the bridge coupling - compared to the prior art - has only a single platinum coil which forms the detector element, which represents a substantial simplification of circuit design 15 and thus ensures a higher reliability.
En tredie fordel ligger i', at medens den ovenfor nævnte kendte teknik ganske vist anvender halvlederkom-ponenter, der dog er sammenkoblet via transformere fordi denne kendte kobling fungerer med vekselstrøm, 20 bruger apparatet ifølge opfindelsen kredse, der som det vil fremgå mere detaljeret af beskrivelsen fortrinsvis er integrerede kredse, der direkte er koblet sammen.A third advantage lies in the fact that while the above-mentioned prior art utilizes semiconductor components which are however connected via transformers because this known coupling operates with alternating current, the apparatus according to the invention uses circuits which, as will be seen in more detail by the description is preferably integrated circuits which are directly coupled together.
Dette bidrager også til den ønskede pålidelighed, navnlig fordi der ikke er transformere mellem trinnene til 25 vekselstrømfunktion.This also contributes to the desired reliability, especially since there are no transformers between the steps of 25 AC power.
Opfindelsen giver således mulighed for at opfylde de strenge krav til høj følsomhed- og driftspålide— lighed, som sådanne detektorapparater til industribrug og hjemmebrug bør udvise.Thus, the invention allows to meet the stringent requirements for high sensitivity and reliability that such detectors for industrial and home use should exhibit.
30 Opfindelsen forklares nærmere i det følgende un der henvisning til den skematiske tegning, hvor fig. 1 viser et blokdiagram over et apparat ifølge opfindelsen til detektering af brændbar gas, ogThe invention is explained in more detail below with reference to the schematic drawing, in which fig. 1 is a block diagram of an apparatus according to the invention for detecting combustible gas; and
DK 159167 BDK 159167 B
3 fig. 2 et koblingsdiagram over dette apparat.3 FIG. 2 is a wiring diagram of this apparatus.
Apparatet omfatter <sn netdel A med transformer, ensretterbro og elektroniske stabiliseringskredse af i og for sig kendt art, en modstandsbro PM, hvor den ene 5 gren udgøres af et detektorelement R til gasdetektering, hvilket element har form som en spole af tynd tråd af platinlegering i et bur af metalnet (element af Davy's type) for at forhindre flammeudbredelse i tilfælde af gasantænding omkring spolen, eventuelt midler til 10 opsugning og videreføring af den omgivende luft, der skal undersøges, indbefattende en sugepumpe og ledninger for at forøge detektorelementet R's følsomhed, og en tonegenerator G i serie med en elektroakustisk transducer.The apparatus comprises a high power section A with transformer, rectifier bridge and electronic stabilization circuits of a kind known per se, a resistance bridge PM, where one branch is constituted by a detector element R for gas detection, which element is in the form of a thin wire coil of platinum alloy. in a metal mesh cage (Davy's type element) to prevent flame propagation in the event of gas ignition around the coil, optionally means for aspirating and passing on the ambient air to be examined, including a suction pump and conduits to increase the sensitivity of the detector element R, and a tone generator G in series with an electroacoustic transducer.
15 I henhold til en foretrukken udførelsesform for op findelsen omfatter netdelen A med henblik på opnåelse af stor stabilitet en transistor Ti, en Zener-diode Zl og en integreret kreds IC1.In accordance with a preferred embodiment of the invention, the mains part A, for high stability, comprises a transistor Ti, a Zener diode Z1 and an integrated circuit IC1.
Broen PM består af to modstande R2 og R4 med 20 fast modstandsværdi, en modstand R3 med varierbar modstandsværdi og den nævnte detektor R. To hjørner af broen er forbundet med indgangene 2 og 3 til en differensforstærker Ad, hvis udgang 6 er tilsluttet indgangen 4 til en integreret kreds IC2 i tonegenera-25 toren G, der frembringer lavfrekvente svingninger.The bridge PM consists of two resistors R2 and R4 of 20 fixed resistance value, a resistor R3 of variable resistance value and said detector R. Two corners of the bridge are connected to the inputs 2 and 3 to a differential amplifier Ad, whose output 6 is connected to the inputs 4 to an integrated circuit IC2 in the tone generator G, which produces low frequency oscillations.
Udgangen 3 fra denne integrerede kreds IC2 har forbindelse med den nævnte elektroakustiske transducer TA gennem en serieforbindelse af en kondensator C8 og en modstand R7.The output 3 of this integrated circuit IC2 connects to said electroacoustic transducer TA through a series connection of capacitor C8 and resistor R7.
30 For at forhindre fejlfunktion af apparatet i til fælde af udfald af netspændingen er der indbygget en hjælpeforsyning A' bestående af et bufferbatteri forbundet med en passende automatisk genopladningskreds, en advarselskreds for netspændingsudfald eller tomt bat-35 teri, og en tidskreds Tp til aktivering af hjælpeforsyningen efter en valgfrit indstillelig mellemtid.In order to prevent malfunction of the apparatus in case of mains failure, an auxiliary supply A 'consisting of a buffer battery connected to an appropriate automatic recharge circuit, a mains voltage or empty battery warning circuit and a time circuit Tp for activating the auxiliary supply after an optional adjustable interval.
Apparatet virker på følgende måde: En forøgelse af koncentrationen af brændbar gas omkring detektoren RThe apparatus works as follows: An increase in the concentration of combustible gas around the detector R
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT09399/81A IT1167878B (en) | 1981-05-05 | 1981-05-05 | FLAMMABLE GAS DETECTOR |
| IT939981 | 1981-05-05 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK185582A DK185582A (en) | 1982-11-06 |
| DK159167B true DK159167B (en) | 1990-09-10 |
| DK159167C DK159167C (en) | 1991-02-11 |
Family
ID=11129547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK185582A DK159167C (en) | 1981-05-05 | 1982-04-26 | DEVICE FOR FLAMMABLE GAS DETECTION |
Country Status (21)
| Country | Link |
|---|---|
| EP (1) | EP0065497B1 (en) |
| JP (2) | JPS57186160A (en) |
| AR (1) | AR228973A1 (en) |
| AT (1) | ATE15562T1 (en) |
| AU (2) | AU8322682A (en) |
| BR (1) | BR8202411A (en) |
| CA (1) | CA1237505A (en) |
| DE (1) | DE3266133D1 (en) |
| DK (1) | DK159167C (en) |
| ES (1) | ES8304343A1 (en) |
| FI (1) | FI75430C (en) |
| GR (1) | GR75842B (en) |
| IE (1) | IE52445B1 (en) |
| IL (1) | IL65497A0 (en) |
| IT (1) | IT1167878B (en) |
| MX (1) | MX151271A (en) |
| NO (1) | NO153236C (en) |
| NZ (1) | NZ200307A (en) |
| PT (1) | PT74843B (en) |
| YU (1) | YU44342B (en) |
| ZA (1) | ZA823039B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004027724A2 (en) * | 2002-06-28 | 2004-04-01 | Sts Stillasservice | Device for security systems for operation of habitats on installations |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1198606B (en) * | 1983-05-17 | 1988-12-21 | Controfugas Srl | FLAMMABLE GAS DETECTOR APPARATUS WITH PRECONDITIONED INTERVENTION |
| JPS6071999U (en) * | 1983-10-21 | 1985-05-21 | 矢崎総業株式会社 | gas alarm |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3221320A (en) * | 1961-04-13 | 1965-11-30 | Komyo Rikagaku Kogyo Kabushiki | Gas alarm circuit |
| US3482233A (en) * | 1967-04-13 | 1969-12-02 | Eastern Co | Gas detector system |
| BE788001A (en) * | 1971-11-01 | 1973-02-26 | T J Connelly Construction Cy I | SMOKE SENSITIVE CIRCUIT, WITH BACKUP BATTERY |
| IT951304B (en) * | 1972-04-11 | 1973-06-30 | Rimoldi V E C Spa | OCN SEWING MACHINE UPPER ROTEL WORK CONVEYOR THE ADJUSTABLE INDEPENDENTLY FROM THE LOWER JAW CONVEYOR |
| US3950739A (en) * | 1974-10-30 | 1976-04-13 | Campman James P | Detector for detecting and locating the source of a contaminating gas or smoke in the atmosphere |
| GB1474700A (en) * | 1974-12-16 | 1977-05-25 | Neotronics Ltd | Device for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent |
| JPS51106674A (en) * | 1975-03-16 | 1976-09-21 | Masanori Mochizuki | BENDEINGUROORUKI |
| JPS5216987U (en) * | 1975-07-24 | 1977-02-05 | ||
| JPS5511496Y2 (en) * | 1975-11-17 | 1980-03-12 | ||
| JPS5433185U (en) * | 1977-08-09 | 1979-03-05 |
-
1981
- 1981-05-05 IT IT09399/81A patent/IT1167878B/en active
-
1982
- 1982-04-13 IL IL65497A patent/IL65497A0/en not_active IP Right Cessation
- 1982-04-15 NZ NZ200307A patent/NZ200307A/en unknown
- 1982-04-16 AR AR289119A patent/AR228973A1/en active
- 1982-04-26 DE DE8282830111T patent/DE3266133D1/en not_active Expired
- 1982-04-26 AT AT82830111T patent/ATE15562T1/en not_active IP Right Cessation
- 1982-04-26 DK DK185582A patent/DK159167C/en not_active IP Right Cessation
- 1982-04-26 EP EP82830111A patent/EP0065497B1/en not_active Expired
- 1982-04-27 BR BR8202411A patent/BR8202411A/en unknown
- 1982-04-28 JP JP57070574A patent/JPS57186160A/en active Pending
- 1982-04-28 ES ES511787A patent/ES8304343A1/en not_active Expired
- 1982-04-29 IE IE1010/82A patent/IE52445B1/en not_active IP Right Cessation
- 1982-05-03 MX MX192553A patent/MX151271A/en unknown
- 1982-05-03 NO NO821461A patent/NO153236C/en unknown
- 1982-05-03 AU AU83226/82A patent/AU8322682A/en not_active Abandoned
- 1982-05-04 CA CA000402237A patent/CA1237505A/en not_active Expired
- 1982-05-04 YU YU945/82A patent/YU44342B/en unknown
- 1982-05-04 PT PT74843A patent/PT74843B/en not_active IP Right Cessation
- 1982-05-04 ZA ZA823039A patent/ZA823039B/en unknown
- 1982-05-04 GR GR68058A patent/GR75842B/el unknown
- 1982-05-05 FI FI821569A patent/FI75430C/en not_active IP Right Cessation
-
1988
- 1988-06-27 AU AU18433/88A patent/AU1843388A/en not_active Abandoned
-
1990
- 1990-10-19 JP JP1990109076U patent/JPH0424439Y2/ja not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004027724A2 (en) * | 2002-06-28 | 2004-04-01 | Sts Stillasservice | Device for security systems for operation of habitats on installations |
| WO2004027724A3 (en) * | 2002-06-28 | 2004-05-13 | Sts Stillasservice | Device for security systems for operation of habitats on installations |
| GB2408370A (en) * | 2002-06-28 | 2005-05-25 | Sts Stillasservice As | Device for security systems for operation of habitats on installations |
| GB2408370B (en) * | 2002-06-28 | 2006-03-01 | Sts Stillasservice As | Device for security systems for operation of habitats on installations |
| US7397361B2 (en) | 2002-06-28 | 2008-07-08 | Sts Stillasservice | Device for security systems for operation of habitats on installations |
Also Published As
| Publication number | Publication date |
|---|---|
| ES511787A0 (en) | 1983-02-16 |
| DK185582A (en) | 1982-11-06 |
| ZA823039B (en) | 1983-03-30 |
| EP0065497B1 (en) | 1985-09-11 |
| JPH0424439Y2 (en) | 1992-06-09 |
| NO153236C (en) | 1986-02-05 |
| DK159167C (en) | 1991-02-11 |
| FI75430B (en) | 1988-02-29 |
| PT74843A (en) | 1982-06-01 |
| MX151271A (en) | 1984-10-29 |
| IL65497A0 (en) | 1982-07-30 |
| AU1843388A (en) | 1988-09-22 |
| CA1237505A (en) | 1988-05-31 |
| IT1167878B (en) | 1987-05-20 |
| PT74843B (en) | 1983-12-02 |
| NZ200307A (en) | 1985-05-31 |
| YU94582A (en) | 1985-03-20 |
| AU8322682A (en) | 1982-11-11 |
| FI75430C (en) | 1988-06-09 |
| JPH0374352U (en) | 1991-07-25 |
| IT8109399A0 (en) | 1981-05-05 |
| IE52445B1 (en) | 1987-10-28 |
| BR8202411A (en) | 1983-04-12 |
| ES8304343A1 (en) | 1983-02-16 |
| FI821569L (en) | 1982-11-06 |
| IE821010L (en) | 1982-11-05 |
| FI821569A0 (en) | 1982-05-05 |
| GR75842B (en) | 1984-08-02 |
| ATE15562T1 (en) | 1985-09-15 |
| AR228973A1 (en) | 1983-05-13 |
| EP0065497A1 (en) | 1982-11-24 |
| JPS57186160A (en) | 1982-11-16 |
| NO821461L (en) | 1982-11-08 |
| YU44342B (en) | 1990-06-30 |
| NO153236B (en) | 1985-10-28 |
| DE3266133D1 (en) | 1985-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |