EP0126036B1 - Detektorgerät für brennbares Gas mit vorherbestimmtem Eingreifer - Google Patents

Detektorgerät für brennbares Gas mit vorherbestimmtem Eingreifer Download PDF

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Publication number
EP0126036B1
EP0126036B1 EP84830113A EP84830113A EP0126036B1 EP 0126036 B1 EP0126036 B1 EP 0126036B1 EP 84830113 A EP84830113 A EP 84830113A EP 84830113 A EP84830113 A EP 84830113A EP 0126036 B1 EP0126036 B1 EP 0126036B1
Authority
EP
European Patent Office
Prior art keywords
gas
resistance
cathode
detector
diode
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
Application number
EP84830113A
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English (en)
French (fr)
Other versions
EP0126036A1 (de
Inventor
Roberto Ferraro
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.)
CONTROFUGAS Srl
Original Assignee
CONTROFUGAS Srl
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 CONTROFUGAS Srl filed Critical CONTROFUGAS Srl
Priority to AT84830113T priority Critical patent/ATE29183T1/de
Publication of EP0126036A1 publication Critical patent/EP0126036A1/de
Application granted granted Critical
Publication of EP0126036B1 publication Critical patent/EP0126036B1/de
Expired legal-status Critical Current

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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

  • a flammable gas detector device comprises a detector element in the form of a narrow spiral made of a thin wire of platinum alloy, inserted in a resistance bridge circuit by which the variation in resistance of the detector as a function of the density of the gas which surrounds it determines, in the bridge circuit, an imbalance which makes it possible to obtain a control signal from a device d alarm and / or intervention.
  • the detector element used has a sensitivity varying according to variations in the operating electric voltage: the value of this voltage being related to the type of gas with which the detector is present. More precisely, it appeared that the supply voltage of maximum sensitivity, and therefore optimal response, of said detector is 2 V DC for methane gas at a concentration of 2% and 1.6 V DC for propane gas. butane at a concentration of 0.8% and that the variation of the voltage measured at the ends of the detector thus supplied is 0.2 V while passing, in the vicinity of the detector, from the condition of absence of gas to that of presence of gas according to the aforementioned percentage.

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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)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Claims (1)

1. Detektorgerät für brennbares Gas, das eine Widerstandsmessbrückenschaltung, die aus zwei Festwiderständen (R1, R2), einem Regelwiderstand (P2) besteht, und einer der Zweige aus einem Detektorelement (R) für Gas besteht, das aus einer aus einem dünnen Platin (11) legierungsdraht engen Spirale gemacht ist, und einen elektronischen Stromkreis, der mit der Widerstandsmessbrückenschaltung, zum Aktivieren eines oder mehreren Signal- und/oder Monitorsysteme, enthält, dadurch gekennzeichnet dass die elektrische Brückenschaltung einen zweiten Regelwiderstand (P1) zu der von dem Type und der Konzentration des zu detektierenden Gases abhängigen Regelung der Höchstempfindlichkeitsspannung des Detektorelements (R) enthält, und dass der elektronische Stromkreis eine erste Diode (DS1), deren Kathode (A) mit dem genannten ersten Regelwiderstand (P2) verbunden ist, der zu der von einem mit der Höchstempfindlichkeitsspannung des Detektorelements (R) entsprechenden Wert abhängigen Regelung ihres Potentials auf einem als das Schwellenpotential der ersten Diode (DS1) niedrigeren Wert befähigt ist, zwei Reihendioden (DS2, DS3) zur Sperr-Vorspannung der Basis eines ersten Transistors (TR1) solange das Potential der genannten Kathode (A) als des genannten Schwellenwertes, in Abwesenheit des zu detektierenden Gases, niedriger bleibt, einen zweiten mit dem Ersten verbündeten Transistor (TR2) zur Erregerung eines Relais (RL) zum Aktiveren des genannten Signal- und/oder Monitorsystems wenn, in Anwesenheit des detektierten Gases, das Potential der genannten Kathode auf dem genannten Schwellenwert gebracht ist, so dass die beiden Transistoren (TR1, TR2) leitende sind, enthält.
EP84830113A 1983-05-17 1984-04-12 Detektorgerät für brennbares Gas mit vorherbestimmtem Eingreifer Expired EP0126036B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84830113T ATE29183T1 (de) 1983-05-17 1984-04-12 Detektorgeraet fuer brennbares gas mit vorherbestimmtem eingreifer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT943383 1983-05-17
IT09433/83A IT1198606B (it) 1983-05-17 1983-05-17 Apparecchio rivelatore di gas infiammabile ad intervento precondizionato

Publications (2)

Publication Number Publication Date
EP0126036A1 EP0126036A1 (de) 1984-11-21
EP0126036B1 true EP0126036B1 (de) 1987-08-26

Family

ID=11130072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84830113A Expired EP0126036B1 (de) 1983-05-17 1984-04-12 Detektorgerät für brennbares Gas mit vorherbestimmtem Eingreifer

Country Status (5)

Country Link
US (1) US4652831A (de)
EP (1) EP0126036B1 (de)
AT (1) ATE29183T1 (de)
DE (1) DE3465645D1 (de)
IT (1) IT1198606B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5218347A (en) * 1991-11-12 1993-06-08 Lindale Industries, Inc. Apparatus for detecting hazardous gases
US5918260A (en) * 1997-06-11 1999-06-29 Cts Corporation Gas sensor with multi-level sensitivity circuitry
US20220336170A1 (en) * 2019-09-04 2022-10-20 Shanghai Roye Electric Co., Ltd. Transformation method for gas density relay, and gas density relay having online self-check function and check method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065497A1 (de) * 1981-05-05 1982-11-24 Franco Maria Conte' Detektorgerät für entzündbares Gas

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239828A (en) * 1962-07-27 1966-03-08 Erdco Eng Corp Combustible gas detector
US3399398A (en) * 1965-07-27 1968-08-27 Mine Safety Appliances Co Combustible gas monitoring system
US3577167A (en) * 1968-02-29 1971-05-04 Rca Corp Integrated circuit biasing arrangements
CH579309A5 (de) * 1973-11-09 1976-08-31 Nohmi Bosai Kogyo Co Ltd
DE2714040C3 (de) * 1977-03-30 1979-10-04 Auergesellschaft Gmbh, 1000 Berlin Gasmeßgerät
US4384934A (en) * 1978-05-31 1983-05-24 The Flinders University Of South Australia Means for determining the partial pressure of oxygen in an atmosphere
US4352087A (en) * 1981-04-22 1982-09-28 Marie C. Kercheval Fume detector and alarm system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065497A1 (de) * 1981-05-05 1982-11-24 Franco Maria Conte' Detektorgerät für entzündbares Gas

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELEKTOR, vol. 8, no. 9, septembre 1982, Canterbury, Kent (GB); "24 hour protection against gas leaks", pages 916-919. *
THE RADIO AND ELECTRONIC ENGINEER, vol. 44, no. 2, février 1974, Londres (GB); J. WATSON et al.: "Applications of the Taguchi gas sensor to alarms for inflammable gases", pages 85-91. *

Also Published As

Publication number Publication date
ATE29183T1 (de) 1987-09-15
EP0126036A1 (de) 1984-11-21
IT8309433A0 (it) 1983-05-17
DE3465645D1 (en) 1987-10-01
IT1198606B (it) 1988-12-21
US4652831A (en) 1987-03-24

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