EP0065497B1 - Inflammable gas detector device - Google Patents

Inflammable gas detector device Download PDF

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Publication number
EP0065497B1
EP0065497B1 EP82830111A EP82830111A EP0065497B1 EP 0065497 B1 EP0065497 B1 EP 0065497B1 EP 82830111 A EP82830111 A EP 82830111A EP 82830111 A EP82830111 A EP 82830111A EP 0065497 B1 EP0065497 B1 EP 0065497B1
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EP
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Prior art keywords
circuit
gas detector
detector device
inflammable gas
detector element
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EP82830111A
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German (de)
French (fr)
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EP0065497A1 (en
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Franco Maria Conte'
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    • 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

Definitions

  • the invention relates to a flammable gas detector.
  • a gas alarm device which includes a circuit for raising the dangerous concentration of gas, of the resistance bridge type, an oscillator circuit coupled to said recovery circuit and adjusted in advance to oscillate when the signal produced by the pick-up circuit exceeds the prefixed limit, a coupling circuit which couples said oscillator circuit with an amplifier, an electro-acoustic device connected to said amplifier and which produces a signal alarm in response to the amplified signal.
  • the oscillator circuit includes a tunnel diode, a capacitor and an inductor which is coupled to the amplifier coil.
  • the amplifier includes a capacitor, fixed resistors, transistors and an output transformer; to the said transformer is connected a speaker.
  • the object of the present invention is to propose a particularly advantageous prevention device for installations which use flammable gases in closed environments.
  • Fig. 1 shows the functional block diagram of the flammable gas detector device according to the invention
  • Fig. 2 shows the diagram relating to the circuit.
  • the mains supply (A) uses, to obtain a higher stability, a transistor (T1 of a Zeener diode (Z1) and a circuit integrated (Icl).).
  • the bridge circuit (PM) is formed by two fixed resistors (R2) and (R4), a variable resistance (R3) and the above-mentioned detector (R); two of the vertices of the bridge are connected to the input terminals (2-3) of a differential amplifier (Ad) whose output (6) is transferred to the terminal (4) of an integrated circuit (lc2) of the note oscillator (G), which functions as a generator of bass oscillations frequency; in addition, the output (3) of said integrated circuit (lc2) is connected, by a capacitor (C8) and a resistor (R7) in series, to the aforementioned electro-acoustic device (TA).
  • TA electro-acoustic device
  • an auxiliary power supply section comprising: a battery mounted in buffer with its automatic recharging circuit, a device for signaling of current interruption and battery failure as well as a timer circuit (Tp) which provides for activating the auxiliary power section with an intermittence which can be adjusted as desired.
  • This operating condition is maintained throughout the time that the sensor (R) continues to detect a percentage of gas greater than that prefixed, this percentage is preset at will by varying the intervention threshold obtained by acting, through of the potentiometer (R3), on the state of balance of the bridge.

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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

L'invention concerne un appareil détecteur de gaz inflammable.The invention relates to a flammable gas detector.

Dans le cas d'emploi industriel et domestique de gaz combustibles, on sait qu'avoir un haut degré de sécurité lors du fonctionnement des installations, représente un problème technique d'aspect prioritaire, car il est nécessaire de réduire au minimum toutes les possibilités de fuite de gaz et par conséquent, d'incendies ou de dégâts aux choses et/ou personnes, vu qu'en général les gaz inflammables sont hautement toxiques.In the case of industrial and domestic use of combustible gases, it is known that having a high degree of safety during the operation of the installations represents a technical problem of priority aspect, since it is necessary to minimize all the possibilities of gas leakage and therefore fire or damage to things and / or people, since in general flammable gases are highly toxic.

On connaît par le brevet US-A-3 221 320 un appareil d'alarme de gaz qui comprend un circuit de rélèvement de la concentration dangereuse de gaz, du type à pont de résistances, un circuit oscillateur accouplé au dit circuit de rélèvement et réglé d'avance pour osciller lorsque le signal, produit par le circuit de rélèvement, dépasse la limite préfixée, un circuit d'accouplement qui accouple le dit circuit oscillateur avec un amplificateur, un dispositif électro-acoustique connecté au dit amplificateur et qui produit un signal d'alarme en réponse au signal amplifié. Deux éléments, formés par une spirale identique d'un fil de platine, l'un en plein air et qui fonctionne comme élément détecteur de gaz et l'autre cacheté dans un étui contenant de l'air pur et qui fonctionne comme élément compensateur, composent deux branches dudit circuit à pont de résistances; une résistance variable est prévue pour l'équilibrage du pont.Known from US-A-3,221,320 a gas alarm device which includes a circuit for raising the dangerous concentration of gas, of the resistance bridge type, an oscillator circuit coupled to said recovery circuit and adjusted in advance to oscillate when the signal produced by the pick-up circuit exceeds the prefixed limit, a coupling circuit which couples said oscillator circuit with an amplifier, an electro-acoustic device connected to said amplifier and which produces a signal alarm in response to the amplified signal. Two elements, formed by an identical spiral of a platinum wire, one in the open air and which functions as a gas detector element and the other sealed in a case containing clean air and which functions as a compensating element, make up two branches of said resistance bridge circuit; a variable resistance is provided for balancing the bridge.

Le circuit oscillateur comprend une diode tunnel, un condensateur et une bobine d'inductance, laquelle est accouplée avec la bobine de l'amplificateur. L'amplificateur comprend un condensateur, des résistences fixes, des transistors et un transformateur de sortie; au dit transformateur est connecté un haut-parleur.The oscillator circuit includes a tunnel diode, a capacitor and an inductor which is coupled to the amplifier coil. The amplifier includes a capacitor, fixed resistors, transistors and an output transformer; to the said transformer is connected a speaker.

La présente invention a pour bout de proposer un appareil de prévention particulieurement avantageux pour les installations qui utilisent les gaz inflammables dans des milieux fermés.The object of the present invention is to propose a particularly advantageous prevention device for installations which use flammable gases in closed environments.

L'invention, telle qu'elle est caractérisée dans les revendications, résout le problème consistant à déceler la présence de gaz inflammable en quantité dangereuse et, en même temps, à contrôler le fonctionnement ou l'intervention d'un dispositif d'alarme ou de secours avec un élément détecteur inséré dans une branche d'un circuit à pont de résistances, lequel détecteur, en présence de gaz en quantité ou en pourcentage superieur à la limite prefixée, détermine, dans ledit circuit à pont de résistances, un degré de déséquilibre qui produit un signal de tension électrique à utiliser pour commander électroniquement un dispositif d'alarme ou de télésignalisation ou d'intervention. Les avantages obtenus grâce à cette invention consistent essentiellement en ce que:

  • - on obtient une sensibilité élevée et un grand degré de fiabilité;
  • - lesdites qualités sont durables dans le temps;
  • - on peut faire varier le seuil d'intervention du détecteur et ainsi augmenter la sensibilité;
  • - le fonctionnement électronique possède une réponse immédiate et une grande flexibilité d'emploi.
The invention, as characterized in the claims, solves the problem of detecting the presence of flammable gas in dangerous quantities and, at the same time, monitoring the operation or intervention of an alarm device or backup with a detector element inserted in a branch of a resistance bridge circuit, which detector, in the presence of gas in quantity or in percentage greater than the prefixed limit, determines, in said resistance bridge circuit, a degree of imbalance which produces an electrical voltage signal to be used to electronically control an alarm or remote signaling or intervention device. The advantages obtained thanks to this invention essentially consist in that:
  • - high sensitivity and a high degree of reliability are obtained;
  • - said qualities are durable over time;
  • - the intervention threshold of the detector can be varied and thus increase the sensitivity;
  • - electronic operation has an immediate response and great flexibility of use.

L'invention est exposée ci-après plus en détail à l'aide des dessins annexés représentant schématiquement la forme préférentielle de réalisation, donnée à titre d'exemple où;The invention is set out below in more detail with the aid of the appended drawings schematically showing the preferred embodiment, given by way of example where;

la Fig. 1 représente le bloc-diagramme fonctionnel de l'appareil détecteur de gaz inflammable conformément à l'invention;Fig. 1 shows the functional block diagram of the flammable gas detector device according to the invention;

la Fig. 2 en représente le schéma relatif au circuit.Fig. 2 shows the diagram relating to the circuit.

Réduite à sa structure essentielle et avec référence aux dessins en annexe, l'invention est formée par:

  • - une section d'alimentation comprenant un alimentateur de secteur (A) muni d'un transformateur à pont de redressement, stabilisé de façon opportune à l'aide de circuits électroniques connus;
  • - un circuit à pont de résistance (PM) dont une branche est composée par un élément détecteur (R) de gaz, lui-même formé par une spirale d'un mince fil d'alliage platineux, contenue de façon opportune dans une cage de fin grillage métallique (du type Davy) qui est connue en soi, afin d'interdire la propagation de la flamme en cas d'inflammation du gaz autour de la spirale;
  • - des moyens éventuels d'aspiration et d'acheminent (As) de l'air environnant à contrôler, comprenant une pompe aspirante et des conduits de canalisation ayant pour but d'augmenter la sensibilité du dit élément détecteur (R) ;
  • - un socillateur de note (G) et un transducteur électro-acoustique (TA) montés en cascade.
Reduced to its essential structure and with reference to the accompanying drawings, the invention is formed by:
  • - a power supply section comprising a power supply unit (A) provided with a rectifier bridge transformer, stabilized in a timely manner using known electronic circuits;
  • - a resistance bridge circuit (PM), one branch of which is composed of a gas detector element (R), itself formed by a spiral of a thin platinum alloy wire, appropriately contained in a cage fine metal mesh (of the Davy type) which is known per se, in order to prevent the propagation of the flame in the event of ignition of the gas around the spiral;
  • - possible means of suction and convey (As) of the surrounding air to be controlled, comprising a suction pump and pipe conduits intended to increase the sensitivity of said detector element (R);
  • - a note switcher (G) and an electro-acoustic transducer (TA) connected in cascade.

De façon plus détaillée et conformément à la forme préférentielle de réalisation, l'alimentation de secteur (A) se sert, pour obtenir une stabilité plus élevée, d'un transistor (T1 d'une diode Zeener (Z1 ) et d'un circuit intégré (Icl). ).In more detail and in accordance with the preferred embodiment, the mains supply (A) uses, to obtain a higher stability, a transistor (T1 of a Zeener diode (Z1) and a circuit integrated (Icl).).

Le circuit à pont (PM) est formé de deux résistances fixes (R2) et (R4), d'une résistance variable (R3) et du détecteur (R) susmentionné; deux des sommets du pont sont connectés aux bornes (2-3) d'entrée d'un amplificateur différentiel (Ad) dont la sortie (6) est reportée à la borne (4) d'un circuit integré (lc2) de l'oscillateur de notes (G), qui fonctionne comme un générateur d'oscillations de basse fréquence; de plus, la sortie (3) dudit circuit intégré (lc2) est connectée, par un condensateur (C8) et une résistance (R7) en série, au dispositif électro-acoustique (TA) susmentionné. Afin d'éviter le défaut de fonctionnement de l'appareil en cas d'interruption de courant, on a prévu une section d'alimentation auxiliaire (A') comprenant: une batterie montée en tampon avec son circuit de recharge automatique, un dispositif de signalisation d'interruption de courant et de panne de la batterie ainsi qu'un circuit temporisateur (Tp) qui pourvoit à activer la section d'alimentation auxiliaire avec une intermittence que l'on peut régler à volonté.The bridge circuit (PM) is formed by two fixed resistors (R2) and (R4), a variable resistance (R3) and the above-mentioned detector (R); two of the vertices of the bridge are connected to the input terminals (2-3) of a differential amplifier (Ad) whose output (6) is transferred to the terminal (4) of an integrated circuit (lc2) of the note oscillator (G), which functions as a generator of bass oscillations frequency; in addition, the output (3) of said integrated circuit (lc2) is connected, by a capacitor (C8) and a resistor (R7) in series, to the aforementioned electro-acoustic device (TA). In order to avoid the malfunction of the device in the event of a power outage, an auxiliary power supply section (A ') is provided comprising: a battery mounted in buffer with its automatic recharging circuit, a device for signaling of current interruption and battery failure as well as a timer circuit (Tp) which provides for activating the auxiliary power section with an intermittence which can be adjusted as desired.

Le fonctionnement est le suivant. En cas d'augmentation de la concentration de gaz inflammable aux alentours du détecteur (R), ce qui entraîne une variation de la propre résistance du détecteur (R), une tension électrique de déséquilibre se vérifie entre les bornes (2) et (3) de l'amplificateur (Ad); correctement amplifié, ce signal amorce le fonctionnement de l'oscillateur de notes (G) qui active le transducteur (TA).The operation is as follows. In the event of an increase in the concentration of flammable gas around the detector (R), which results in a variation of the detector's own resistance (R), an electrical imbalance voltage is verified between terminals (2) and (3 ) of the amplifier (Ad); correctly amplified, this signal initiates the operation of the note oscillator (G) which activates the transducer (TA).

Cette condition de fonctionnement se maintient pendant tout le temps que le capteur (R) continue à déceler un pourcentage de gaz supérieur à celui préfixé, ce pourcentage est préétabli à volonté en faisant varier le seuil d'intervention obtenu en agissant, par l'intermédiaire du potentio-métre (R3), sur l'état d'équilibrage du pont.This operating condition is maintained throughout the time that the sensor (R) continues to detect a percentage of gas greater than that prefixed, this percentage is preset at will by varying the intervention threshold obtained by acting, through of the potentiometer (R3), on the state of balance of the bridge.

Exemple de réalisationExample of realization

Nous indiquons ci-dessous les valeurs des principales composants de l'appareil utilisées dans la forme concrète de réalisation considérée:

Figure imgb0001
We indicate below the values of the main components of the device used in the concrete embodiment considered:
Figure imgb0001

Claims (5)

1. An inflammable gas detector device comprising a resistor bridge circuit (PM), one arm of which comprises a gas detector element (R) formed by a coil of platinum alloy wire, and an alarm transducer (TA), characterised in that a frist circuit (Ad) connected to the bridge circuit (PM) and operating as a variable threshold differential amplifier uses the imbalance occurring between the terminals (2-3) of said circuit (Ad) when the quantity of gas in the vicinity of the detector (R) exceeds the preset limit, in order to trigger a second circuit (lc2) which operates as a low-frequency oscillator and which actuates the alarm transducer (TA).
2. An inflammable gas detector device according to claim 1, characterised in that the said circuit (Ad) and (Ic2) are integrated circuits.
3. An inflammable gas detector device according to claim 1, characterised in that the threshold of the said circuit (Ad) is variable by means of a potentiometer (R3).
4. An inflammable gas detector device according to claim 1, characterised in that the gas detector element (R) is housed in a Davy cage.
5. An inflammable gas detector device according to claim 1, characterised in that means (As) for conveying the ambient air to the actual detector element (R) are associated with the gas detector element (R).
EP82830111A 1981-05-05 1982-04-26 Inflammable gas detector device Expired EP0065497B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82830111T ATE15562T1 (en) 1981-05-05 1982-04-26 DETECTING DEVICE FOR FLAMMABLE GAS.

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 (2)

Publication Number Publication Date
EP0065497A1 EP0065497A1 (en) 1982-11-24
EP0065497B1 true EP0065497B1 (en) 1985-09-11

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EP82830111A Expired EP0065497B1 (en) 1981-05-05 1982-04-26 Inflammable gas detector device

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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)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
NO317999B3 (en) * 2002-06-28 2010-07-05 Sts Gruppen As Device for securing the operation of a habitat

Family Cites Families (10)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
ES511787A0 (en) 1983-02-16
DK185582A (en) 1982-11-06
ZA823039B (en) 1983-03-30
JPH0424439Y2 (en) 1992-06-09
NO153236C (en) 1986-02-05
DK159167C (en) 1991-02-11
DK159167B (en) 1990-09-10
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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