EP0065497A1 - Inflammable gas detector device - Google Patents

Inflammable gas detector device Download PDF

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Publication number
EP0065497A1
EP0065497A1 EP82830111A EP82830111A EP0065497A1 EP 0065497 A1 EP0065497 A1 EP 0065497A1 EP 82830111 A EP82830111 A EP 82830111A EP 82830111 A EP82830111 A EP 82830111A EP 0065497 A1 EP0065497 A1 EP 0065497A1
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EP
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Prior art keywords
detector
flammable gas
gas detector
circuit
bridge circuit
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EP82830111A
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German (de)
French (fr)
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EP0065497B1 (en
Inventor
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.
  • the object of the present invention is to propose a particularly advantageous prevention device for installations which use flammable gases in closed environments.
  • the invention solves the problem of detecting the presence of flammable gas in dangerous quantity and, at the same time, controlling the operation or intervention of a device for alarm or emergence, with a detector element inserted in a branch of a circuit with bridge of re sistances which detector, in the presence of gas in quantity in percentage greater than the prefixed limit, determines, in said circuit with resistance bridge, a degree of imbalance which produces an electrical voltage signal to be used to control electronically a tear device or remote signaling or intervention.
  • FIG. 1 shows the functional block diagram of a flammable gas detection device according to the invention
  • Fig. 2 shows the diagram relating to the circuit.
  • the mains power supply (A) uses, to obtain higher stability, a transistor (T1), a Zeener diode (Z1) and an integrated circuit (Ic1).
  • the bridge circuit (PM) is formed by two resistors (Ces) (R2) and (R4), a variable resistor (R3) and the detector (R) mentioned above; 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 (Ic2) of the 'note oscillator (G) which functions as a generator of low frequency oscillations; in addition, the output (3) of said integrated circuit (Ic2) is connected, by a capacitor (C8) and a resistor (R7) in series, to the above-mentioned electro-acoustic device (TA).
  • TA electro-acoustic device
  • an auxiliary power supply section comprising: a buffer battery with its relative automatic recharging circuit, a device for signaling a power interruption and failure the battery as well as a timer circuit (Tp) which activates 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 balance state 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)

Abstract

The detector (R) is formed of a spiral of thin platinum alloy wire enclosed in a Davy cage of fine metallic grids to prevent flame propagation in the event of ignition within. It is connected in a bridge circuit with potentiometer (R3) and two fixed resistor (R2, R4), supplied with rectified AC from a series transistor (T1) and Zener diode stabiliser (Z1). The unbalance of the bridge is monitored by a differential amplifier (Ad) which controls a low-frequency tone generator (IC2). When the threshold of unbalance is exceeded due to a concn. of gas within the detector, an alarm is given by an electroacoustic device (TA). A standby battery and delay circuit may be provided to ensure operation following failure of the AC supply or rectifier.

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 étant 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 being necessary to minimize all the possibilities of gas leakage and consequently, fires or damage to things and / or people, since in general flammable gases are highly toxic.

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 a déceler la présence de gaz inflammable en quan - tité dangereuse et, en même temps, de contrôler le fonctionnement ou l'intervention d'un dispositif d'allarme ou d'émergence, avec un élément détecteur inséré dans une branche d'un circuit à pont de résistances lequel détecteur, en présence de gaz en quantité en pourcentage superieure 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'al larme ou de télésignalisation ou d'intervention. Les avantages obtenus grâce à cette invention consistent essentiellement en ceci qu'on obtient une sensibilité élevée et un grand degré de fiabilité; que lesdites qualités sont durables dans le temps; qu'on peut varier le seuil d'intervention du détecteur et ainsi augmenter la sensibilité; que le fonctionnement électronique possède une réponse immédiate et une grande flexibilité d'emploi. L'invention est exposée ci-après plus en détail à l'aide des dessins annexés représentant schématiquement une forme préférentielle de réalisation, donnée uniquement à titre de démostration pratique et ne deaant pas être prise dans un sens restreint ou: la Fig. 1 représente le bloc-diagramme fonctionnel d'un appareil détecteur de gaz inflammable conformément à l'invention; la Fig. 2 en représente le schéma relatif au circuit.The invention, as characterized in the claims, solves the problem of detecting the presence of flammable gas in dangerous quantity and, at the same time, controlling the operation or intervention of a device for alarm or emergence, with a detector element inserted in a branch of a circuit with bridge of re sistances which detector, in the presence of gas in quantity in percentage greater than the prefixed limit, determines, in said circuit with resistance bridge, a degree of imbalance which produces an electrical voltage signal to be used to control electronically a tear device or remote signaling or intervention. The advantages obtained thanks to this invention consist essentially in that a high sensitivity and a high degree of reliability are obtained; that the said qualities are durable over time; that the intervention threshold of the detector can be varied and thus increase the sensitivity; that electronic operation has an immediate response and great flexibility of use. The invention is set out below in more detail with the aid of the appended drawings schematically showing a preferred embodiment, given solely by way of practical demonstration and which should not be taken in a restricted sense or: FIG. 1 shows the functional block diagram of a flammable gas detection device according to the invention; Fig. 2 shows the diagram relating to the circuit.

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

  • - une section d'alimentation comprenant un alimenta- teur 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 oppor tune dans une cage de fin grillage métallique (du type Davy) afin d'interdire la propagation de la flamme en cas d'inflammation du gaz autour de la spirale;
  • - des moyens éventuels d'aspination et d'acheminent (As) de l'air environnant à contrôler, comprenant une pompe aspirante et des conduits de canalisaton ayant pour but d'augmenter la sensibilité du dit élément détecteur (R);
  • - un oscillateur de note (G) et un transducteur électro-acoustique (TA) montés en cascade.
deduced from its essential structure and by reference to the appended 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) including one branch che is composed by a gas detector element (R), itself formed by a spiral of a thin platinum alloy wire, contained in a timely manner in a fine wire mesh cage (of the Davy type) in order to prohibit the propagation of the flame in the event of ignition of the gas around the spiral;
  • - possible means of aspiration and convey (As) of the surrounding air to be controlled, comprising a suction pump and ducting conduits intended to increase the sensitivity of said detector element (R);
  • - a note oscillator (G) and an electro-acoustic transducer (TA) connected in cascade.

De façon plus détaillée et conformément à la forme préférentielle de réalisation, l'alimentateur 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 (Ic1).In more detail and in accordance with the preferred embodiment, the mains power supply (A) uses, to obtain higher stability, a transistor (T1), a Zeener diode (Z1) and an integrated circuit (Ic1).

Le circuit à pont (PM) est formé par deux résistan_ cesfixes (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 cir cuit integré (Ic2) de l'oscillateur de note (G) qui fonctionne comme un générateur d'oscillations de basse fréquence; de plus, la sortie (3) du dit circuit intégré (Ic2) est connectée, par un conden sateur (C8) et une résistance (R7) en série, au dispositif électro-acoustique (TA) susmetionné. Afin d'éviter le défaut de fonctionnement de l'ap pareil en cas d'interruption de courant, on a prévu une section d'alimentation auxiliaire (A') comprenant: une batterie montée en tampon avec son circuit relatif de recharge automatique, un dispositif de signalisation d'interruption de courant et de panne de la batterie amnsi 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 resistors (Ces) (R2) and (R4), a variable resistor (R3) and the detector (R) mentioned above; 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 (Ic2) of the 'note oscillator (G) which functions as a generator of low frequency oscillations; in addition, the output (3) of said integrated circuit (Ic2) is connected, by a capacitor (C8) and a resistor (R7) in series, to the above-mentioned electro-acoustic device (TA). In order to avoid malfunction of the ap similar in the event of a power interruption, an auxiliary power supply section (A ′) has been provided comprising: a buffer battery with its relative automatic recharging circuit, a device for signaling a power interruption and failure the battery as well as a timer circuit (Tp) which activates 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 note (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 leads to a variation in 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-mètre (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 balance state of the bridge.

Exemple de réalisation.Example of realization.

Nous indiquons ci-dessous les valeurs des principa les composantes de l'appareil utilisées dans la forme concrète de réalisation considérée;

Figure imgb0001
Figure imgb0002
 We indicate below the values of the principal components of the apparatus used in the concrete embodiment considered;
Figure imgb0001
Figure imgb0002

Claims (6)

1) Appareil détecteur de gaz inflammable caractérisé par le fait qu'il comprend en combinaison: une section d'alimentation (A), un circuit à pont de résistances (PM) dont une des branches est formée par un élément détecteur (R) de gaz, un oscillateur de note (G) et un transducteur électro-acou_ stique (TA), disposés conformément au bloc-diagram me fonctionnel de la Fig. 1 et au schéma du circuit de la Fig. 2 des dessins en annexe.1) Flammable gas detector apparatus characterized in that it comprises in combination: a supply section (A), a resistance bridge circuit (PM) of which one of the branches is formed by a detector element (R) of gas, a note oscillator (G) and an electro-acoustic transducer (TA), arranged in accordance with the functional block diagram of FIG. 1 and to the circuit diagram of FIG. 2 of the attached drawings. 2) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que le dit élément détecteur (R) est formé par une spirale d'un mince fil d'alliage platineux, contenue dans une cage de Davy.2) flammable gas detector device according to claim 1) characterized in that said detector element (R) is formed by a spiral of a thin platinum alloy wire, contained in a Davy cage. 3) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que le dit élément détecteur (R) détermine, dans le dit circuit à pont (PM) lorceque la quantité de gaz aux alentours du détecteur dépasse la limite pre- fixée, un degré de déséquilibre qui produit un signal de tension électrique qui est utilisé pour commander électroniquement le fonctionnement d'un dispositif d'allarme et/ou de télésignalisation et/ou d'intervention.3) flammable gas detector according to claim 1) characterized in that said detector element (R) determines, in said bridge circuit (PM) lorceque the amount of gas around the detector exceeds the preset limit , a degree of imbalance which produces an electrical voltage signal which is used to electronically control the operation of an alarm and / or remote signaling and / or intervention device. 4) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que le dit circuit à pont (PM) comprend une résistance potentiométrique (R3) de réglage de l'état d'équilibre du circuit à pont capable de faire varier le seuil d'intervention de l'élément détecteur (R).4) flammable gas detector device according to claim 1) characterized in that said bridge circuit (PM) comprises a potentiometric resistance (R3) for adjusting the equilibrium state of the bridge circuit capable of varying the detector element intervention threshold (R). 5) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait qu'il comprend des moyens d'acheminement (As) de l'air environnant sur l'élément détecteur (R).5) Flammable gas detector according to the claim 1) characterized in that it comprises means for conveying (As) the surrounding air to the detector element (R). 6) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que la section d'alimentation primaire est associée à une section d'alimentation auxiliaire (A') comprenant une batterie en tampon avec un circuit de recharge automatique et un dispositif de signalisation de l'interruption de courant et de panne de la batterie ainsi qu'un circuit tomporisateur (Ip) pour permettre à l'appareil de fonctionner par intermittence.6) flammable gas detector device according to claim 1) characterized in that the primary supply section is associated with an auxiliary supply section (A ') comprising a buffer battery with an automatic recharging circuit and a device signaling of current interruption and battery failure as well as a booster circuit (Ip) to allow the device to operate intermittently.
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)

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

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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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0126036B1 (en) * 1983-05-17 1987-08-26 Controfugas S.R.L. Inflammable gas detection apparatus with predetermined intervention

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* 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
US3750123A (en) * 1971-11-01 1973-07-31 T J Connelly Constr Co Inc Smoke sensing circuit with battery standby
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

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
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
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

Patent Citations (5)

* 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
US3750123A (en) * 1971-11-01 1973-07-31 T J Connelly Constr Co Inc Smoke sensing circuit with battery standby
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0126036B1 (en) * 1983-05-17 1987-08-26 Controfugas S.R.L. Inflammable gas detection apparatus with predetermined intervention

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
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
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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