EP0197257B1 - Appareillage pour détecter la présence d'un gaz dans un espace clos - Google Patents

Appareillage pour détecter la présence d'un gaz dans un espace clos Download PDF

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Publication number
EP0197257B1
EP0197257B1 EP86101572A EP86101572A EP0197257B1 EP 0197257 B1 EP0197257 B1 EP 0197257B1 EP 86101572 A EP86101572 A EP 86101572A EP 86101572 A EP86101572 A EP 86101572A EP 0197257 B1 EP0197257 B1 EP 0197257B1
Authority
EP
European Patent Office
Prior art keywords
control unit
environment
gas
sensor
current
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 - Lifetime
Application number
EP86101572A
Other languages
German (de)
English (en)
Other versions
EP0197257A1 (fr
Inventor
Giovanni Salutati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PROTECTOR SAL Sas di Giovanni Salutati
Original Assignee
PROTECTOR SAL Sas di Giovanni Salutati
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PROTECTOR SAL Sas di Giovanni Salutati filed Critical PROTECTOR SAL Sas di Giovanni Salutati
Priority to AT86101572T priority Critical patent/ATE49313T1/de
Publication of EP0197257A1 publication Critical patent/EP0197257A1/fr
Application granted granted Critical
Publication of EP0197257B1 publication Critical patent/EP0197257B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • This invention relates to an apparatus for detecting the presence in a closed environment of even small quantities of gases which form an explosive mixture with air, for indicating said gas presence, and for switching off the electricity supply to any appliance present in said environment.
  • the danger of gas presence in a closed environment, especially a domestic environment is a well known problem where this derives from accidental leakages from domestic appliances such as water heaters, gas fires or gas cookers, or from fractures in their connection pipes, when they are fed with combustible gas either from the mains or from cylinders.
  • This gas forms an explosive mixture with air, which easily ignites by accidental triggering with a spark from any automatic switch for appliances present in the environment (such as a refrigerator) or from any switch for other equipment present in said environment which is operated either intentionally or accidentally (such as lighting or bell switches), to result in considerable damage.
  • the apparatus according to the present invention provides a totally satisfactory solution to said explosion problem and the problem of indicating gas presence in a closed environment, by immediately switching off the electricity supply to any appliance present in said environment while at the same time activating an optical and acoustic warning system making timely intervention possible for correcting the dangerous situation.
  • the apparatus of the present invention is provided with a self-contained power supply system in the form of a rechargeable battery which operates every time the mains electricity fails, either because of power failure deriving from the electricity supply company or because said apparatus according to the invention has operated to switch off the electricity supply to the environment in which it is situated and in which gas has been found to be present.
  • the apparatus according to the invention therefore consists essentially of a control unit with an incorporated power supply battery, said unit being connected to a gas sensor sensitive to the presence of gas, in particular of the hydrogen, carbon monoxide, hydrocarbon and combustible organic compound type, and further connected to an optical and acoustic alarm system and to a switch for switching off the electricity supply to the environment in which the gas presence has been detected.
  • control unit can be connected to other apparatus, such as servo-mechanisms or electronic processing or remote transmission systems, in order to provide other types of intervention or indication even at large distances from the place in which said control unit or gas sensor is present.
  • the terminals 101, 102 and 103 of the control unit 100 are connected to the gas sensor 200.
  • the terminals 104 and 105 are connected to the control unit power supply battery 130, which operates should the mains supply fail.
  • Theterminals 109, 1 10, 1 11 and 112 are connected to the acoustic alarms 201 and/or optical alarms 202 which indicate the gas presence detected by the sensor 200.
  • the terminal 106 is free, and the terminals 107 and 108 are available for feeding control signals to other types of servo mechanisms or systems to be connected to the control unit.
  • the control unit is normally fed with 220 V alternating current which, by means of a power circuit 204 comprising a transformer and rectifier (not shown in the figures), is converted into 24 V direct current and enters the control unit circuit through the terminal 113, the terminal 115 being connected to earth.
  • a power circuit 204 comprising a transformer and rectifier (not shown in the figures)
  • 24 V direct current enters the control unit circuit through the terminal 113, the terminal 115 being connected to earth.
  • the voltage of the supply current is regulated to the optimum value for charging the battery 130.
  • the LED 131 indicates the presence of power in the control unit circuit, and the zener 132 further reduces the current voltage to 6 V for feeding the electronic circuit.
  • the switch 133 is used for switching off the power to the circuit of the control unit during lengthy periods of system inactivity, such as during storage or transportation.
  • the gas sensor 200 is fed by the timer circuit formed from the oscillators 140, 141, 142,' 143 and the counter 144.
  • the counter is reset by the circuit comprising the capacitor 150 and resistor 151, and with the counter at zero the sensor 200 is fed by way of the transistors 145 and 146.
  • the circuit formed from the oscillators 160 and 161 forms a bistable multivibrator which memorises the alarm state.
  • the oscillator 162 activates the oscillators 163, 164, 165 and 166, which by way of the transistor 167 feed the optical alarms 202 and acoustic alarms 201 connected to the terminals 109,110,111,112.
  • the transistor 170 operates a system comprising one or more relays (not shown in the figures) which are connected to the terminal 114 and operate the switch 203 to switch off the mains supply to the environment in which the gas presence has been detected.
  • the circuit formed by the oscillators 160 and 161 enables the sensor 200 to be fed only intermittently, by way of the counter 144 and oscillator 143, for example for only two minutes in every ten minutes, or for shorter times or with longer intervals, to thus prevent useless energy consumption.
  • the alarm cycle continues in accordance with the predetermined time interval, for example ten minutes, by feeding current to the sensor 200 for two minutes (or less), memorising any alarm state and then remaining inactive until the end of the interval, ie from the second to the tenth minute.
  • the predetermined time interval for example ten minutes
  • the alarm could be made to operate only on opening the entrance door to the environment in which the gas is present, by fitting a sealed magnetic switch to the door and connecting it to the control unit 100 by the terminals 107 and 108.
  • the sensor 200 which is of TGS type, ie a sintered gas-sensitive semiconductor, is fed at 5 volts by the stabiliser 300.
  • the transistor 301 ensures that current is always present in the sensor 200. If the supply to the heating resistor of the sensor 200 becomes interrupted or if the gas-sensitive resistor breaks down, the current which keeps the transistor 301 in its conducting state either disappears or decreases with the result that this transistor becomes inhibited, to inhibit the transistor 302, which puts the two transistors 303 and 304 into the conducting state to generate the alarm signal.
  • the sensor resistance decreases if gas is present, to operate the trigger circuit formed by the circuit containing the transistors 303 and 305.
  • the transistor 305 conducts current to put the transistor 303 into the conducting state, which causes the transistor 304 to conduct so generating the alarm signal.
  • the diode 306 protects the circuit against current polarity reversal.
  • the purpose of the resistor 307 is to discharge the power dissipated by the regulator 300.
  • the LED 308 which is of the green light type, indicates the presence of current in the circuit, whereas the LED 309, which is of the red light type, lights when the alarm operates either due to the presence of gas or due to a fault in the sensor.
  • trimmer 310 The purpose of the trimmer 310 is to adjust the sensitivity of the sensor 200.

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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)
  • Pipeline Systems (AREA)
  • Air Bags (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Catalysts (AREA)

Claims (3)

1. Appareil de détection de la présence, dans un environnement fermé, de gaz qui forment des mélanges explosifs avec l'air, pour indiquer leur présence et pour couper l'alimentation électrique au niveau de tout appareil présent dans cet environnement, caractérisé en ce qu'il comprend une unité de commande électronique (100) avec une batterie d'alimentation incorporée (130), ladite unité de commande électronique permettant au courant d'alimenter un détecteur de gaz (200) pendant une durée prédéterminée et à des intervalles de temps prédéterminés et mémorisant tout état d'alarme détecté pendant la durée pendant laquelle le courant est délivré audit détecteur (200), et en ce qu'il est relié à des alarmes optique (202) et acoustique (201), à un commutateur (203) pour couper l'alimentation électrique et à deux bornes de connexion (107 et 108) pour alimenter en signaux de commande d'autres systèmes qui peuvent être reliés à l'unité de commande.
2. Appareil selon la revendication 1, caractérisé par le fait que lesdites alarmes optique (202) et acoustique (201) sont actionnées seulement en ouvrant la porte d'entrée de l'environnement dans lequel le gaz est présent, en installant un commutateur magnétique hermétique à la porte et en le reliant à ladite unité de commande (100) par l'intermédiaire des bornes de connexion (107 et 108).
3. Appareil selon la revendication 1, caractérisé par le fait que l'alimentation en courant de la résistance dudit détecteur (200) est commandée par un système qui engendre le signal d'alarme en cas de rupture ou de diminution de ladite alimentation.
EP86101572A 1985-02-13 1986-02-07 Appareillage pour détecter la présence d'un gaz dans un espace clos Expired - Lifetime EP0197257B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101572T ATE49313T1 (de) 1985-02-13 1986-02-07 Einrichtung zum aufspueren von gas in einem geschlossenen raum.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8511544U IT212760Z2 (it) 1985-02-13 1985-02-13 Sistema di protezione contro le fughe di gas 'protector-gas'
IT1154485U 1985-02-13

Publications (2)

Publication Number Publication Date
EP0197257A1 EP0197257A1 (fr) 1986-10-15
EP0197257B1 true EP0197257B1 (fr) 1990-01-03

Family

ID=11135590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101572A Expired - Lifetime EP0197257B1 (fr) 1985-02-13 1986-02-07 Appareillage pour détecter la présence d'un gaz dans un espace clos

Country Status (5)

Country Link
EP (1) EP0197257B1 (fr)
AT (1) ATE49313T1 (fr)
DE (1) DE3668087D1 (fr)
ES (1) ES292267Y (fr)
IT (1) IT212760Z2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636502A1 (de) * 1986-10-27 1988-04-28 Gaertner Paul Dipl Kaufm Schutzvorrichtung gegen gasexplosionen in wohnraeumen
DE3812416A1 (de) * 1988-04-14 1989-10-26 Asea Brown Boveri Sicherheitsbedingte stromunterbrechung
GB8924004D0 (en) * 1989-10-25 1989-12-13 Johnson & Starley Ltd Fire alarm system
ES2078840B1 (es) * 1993-01-28 1997-10-16 Roberto Cuenca Pedro Dispositivo para la deteccion de gases.
GB2275556A (en) * 1993-02-26 1994-08-31 Sohail Malik Fire alarm system in appliances
IT1299493B1 (it) * 1998-06-05 2000-03-16 Feliciano Cauzzo Impianto di sicurezza per sospendere l'erogazione di gas quando viene rilevata una dispersione
GB9907520D0 (en) * 1999-04-01 1999-05-26 Central Research Lab Ltd A gas sensor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2180423B3 (fr) * 1972-04-17 1975-06-20 Securitex Sarl
NL7313897A (nl) * 1973-10-10 1975-04-14 Visser Robertus Gerardus Gasindicator.
US4007456A (en) * 1975-12-01 1977-02-08 Craftor Inc. Gas detecting and warning system
US4126790A (en) * 1976-09-20 1978-11-21 Solomon Elias E Strobed smoke detector
DE3102924A1 (de) * 1981-01-29 1982-12-09 Jakob 2000 Hamburg Granek Gaswarnsystem
FR2543839B1 (fr) * 1983-04-08 1986-04-18 Pgep Dispositif autonome de protection d'un ensemble electrique contre l'incendie

Also Published As

Publication number Publication date
IT212760Z2 (it) 1989-09-20
DE3668087D1 (de) 1990-02-08
ES292267Y (es) 1987-05-01
ATE49313T1 (de) 1990-01-15
EP0197257A1 (fr) 1986-10-15
IT8511544V0 (it) 1985-02-13
ES292267U (es) 1986-08-16

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