EP0065497B1 - Appareil détecteur de gaz inflammable - Google Patents
Appareil détecteur de gaz inflammable Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- gas detector
- detector device
- inflammable gas
- detector element
- 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
Images
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
- 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.
Landscapes
- 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)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82830111T ATE15562T1 (de) | 1981-05-05 | 1982-04-26 | Detektorgeraet fuer entzuendbares gas. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT09399/81A IT1167878B (it) | 1981-05-05 | 1981-05-05 | Apparecchio rivelatore di gas infiammabile |
| IT939981 | 1981-05-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0065497A1 EP0065497A1 (fr) | 1982-11-24 |
| EP0065497B1 true EP0065497B1 (fr) | 1985-09-11 |
Family
ID=11129547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82830111A Expired EP0065497B1 (fr) | 1981-05-05 | 1982-04-26 | Appareil détecteur de gaz inflammable |
Country Status (21)
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1198606B (it) * | 1983-05-17 | 1988-12-21 | Controfugas Srl | Apparecchio rivelatore di gas infiammabile ad intervento precondizionato |
| JPS6071999U (ja) * | 1983-10-21 | 1985-05-21 | 矢崎総業株式会社 | ガス警報器 |
| NO317999B3 (no) * | 2002-06-28 | 2010-07-05 | Sts Gruppen As | Anordning for sikring av driften av et habitat |
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 (fr) * | 1971-11-01 | 1973-02-26 | T J Connelly Construction Cy I | Circuit sensible a la fumee, avec batterie de secours |
| IT951304B (it) * | 1972-04-11 | 1973-06-30 | Rimoldi V E C Spa | Macchina per cucire ocn trasporta tore superiore del lavoro a rotel la regolabile indipendentemente dal trasportatore inferiore a griffa |
| 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 (ja) * | 1975-03-16 | 1976-09-21 | Masanori Mochizuki | Bendeingurooruki |
| JPS5216987U (US20100056889A1-20100304-C00004.png) * | 1975-07-24 | 1977-02-05 | ||
| JPS5511496Y2 (US20100056889A1-20100304-C00004.png) * | 1975-11-17 | 1980-03-12 | ||
| JPS5433185U (US20100056889A1-20100304-C00004.png) * | 1977-08-09 | 1979-03-05 |
-
1981
- 1981-05-05 IT IT09399/81A patent/IT1167878B/it active
-
1982
- 1982-04-13 IL IL65497A patent/IL65497A0/xx not_active IP Right Cessation
- 1982-04-15 NZ NZ200307A patent/NZ200307A/en unknown
- 1982-04-16 AR AR289119A patent/AR228973A1/es active
- 1982-04-26 DE DE8282830111T patent/DE3266133D1/de not_active Expired
- 1982-04-26 AT AT82830111T patent/ATE15562T1/de not_active IP Right Cessation
- 1982-04-26 DK DK185582A patent/DK159167C/da not_active IP Right Cessation
- 1982-04-26 EP EP82830111A patent/EP0065497B1/fr not_active Expired
- 1982-04-27 BR BR8202411A patent/BR8202411A/pt unknown
- 1982-04-28 JP JP57070574A patent/JPS57186160A/ja active Pending
- 1982-04-28 ES ES511787A patent/ES8304343A1/es not_active Expired
- 1982-04-29 IE IE1010/82A patent/IE52445B1/en not_active IP Right Cessation
- 1982-05-03 MX MX192553A patent/MX151271A/es unknown
- 1982-05-03 NO NO821461A patent/NO153236C/no 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/xx unknown
- 1982-05-04 PT PT74843A patent/PT74843B/pt not_active IP Right Cessation
- 1982-05-04 ZA ZA823039A patent/ZA823039B/xx unknown
- 1982-05-04 GR GR68058A patent/GR75842B/el unknown
- 1982-05-05 FI FI821569A patent/FI75430C/fi 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
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