EP0197371B1 - Agencement pour détecteur d'incendie avec un système d'aspiration - Google Patents

Agencement pour détecteur d'incendie avec un système d'aspiration Download PDF

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Publication number
EP0197371B1
EP0197371B1 EP86103608A EP86103608A EP0197371B1 EP 0197371 B1 EP0197371 B1 EP 0197371B1 EP 86103608 A EP86103608 A EP 86103608A EP 86103608 A EP86103608 A EP 86103608A EP 0197371 B1 EP0197371 B1 EP 0197371B1
Authority
EP
European Patent Office
Prior art keywords
flow
speed
value
central station
sensor
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
EP86103608A
Other languages
German (de)
English (en)
Other versions
EP0197371A1 (fr
Inventor
Peer Dr.-Ing. Thilo
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT86103608T priority Critical patent/ATE49484T1/de
Publication of EP0197371A1 publication Critical patent/EP0197371A1/fr
Application granted granted Critical
Publication of EP0197371B1 publication Critical patent/EP0197371B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a method for early fire detection in a fire alarm system with an extraction system according to the preamble of claim 1.
  • Suction systems are used for fire detection under special conditions, such as those found in warehouses or factories, high-bay warehouses or aircraft halls.
  • the decisive factor for use is that the measuring points, i.e. the places where the fire detectors should be arranged, are inaccessible, confined to space or too high in very high rooms, so that normal point detectors cannot be used.
  • a fire alarm system with an exhaust system generally consists of one or more exhaust pipes, which are connected in a star shape to a measuring chamber.
  • a fan which sucks the air through the pipes via a smoke detector which is also arranged in the measuring chamber.
  • the possibly smoky air enters the suction system through suitable suction openings in the suction pipes. If the smoke concentration is sufficiently high, the fire detector responds so that the associated control panel can give an alarm.
  • the smoke detector needs a high sensitivity which is adapted to the respective configuration, because smoke that penetrates through one or more suction openings is to be detected, although this is diluted by the pure air flowing into the other openings. For this reason, an external, difficult setting of the smoke detector is required.
  • reliable operation is only ensured if all openings for the air inlet are actually free. Even a slight increase in the flow resistance can cause the suction to be shifted to other pipes or openings, so that fires at the point in question are poorly or not recognized at all.
  • a suction system with at least one pipe network for smoke detection is already known, in which a probe for measuring the flow rate of the extracted air is arranged in at least one suction pipe.
  • the probe delivers an electrical signal depending on the flow rate, so that it can be recognized whether openings in the pipe network are blocked or whether the pipe network is open.
  • a method for increasing the response sensitivity in a fire alarm system which has at least one detector and a control center with a data processing device, the detector querying its measured value from the control center and forming a detector idle value in the control center and is stored and wherein an alarm message is derived from the queried measured values if the queried measured value of the detector deviates from the detector idle value by a predeterminable amount.
  • the object of the invention is to provide a method for early fire detection in a fire detection system with a known suction system, which avoids the disadvantages described above and does not require any special, highly sensitive and expensive fire detectors and no complex adjustment of the detectors.
  • the method is based on a fire alarm system with an extraction system and with a control center which has a data processing device which regularly polls and processes the smoke detectors for their measured values, so that an alarm message can be derived therefrom.
  • a respective idle value is formed and stored in the control center from the queried analog detector measurement values.
  • An alarm message is derived from the queried measured values by comparison with the stored idle value when the queried measured value of the smoke detector in question increases the corresponding idle value by a predetermined amount, i.e. the adjustable alarm threshold, falls below or exceeds.
  • a sensor is arranged in each exhaust pipe of the fire alarm system, which measures the flow rate.
  • these analog measured values for the flow velocity are also regularly queried from the control center.
  • a flow rate mean value is formed and stored in the control center for each flow rate sensor. The measured flow velocity measured values are compared with the corresponding mean value; If the queried measured value deviates by a predetermined amount, a fault message is issued.
  • the amount of the alarm threshold is changed as a function of the determined flow velocity measured values.
  • the amount of the alarm threshold is advantageously set as a function of the measured flow velocity measured values. For example, increasing the flow rate reduces the amount of the alarm threshold.
  • the setting and the adjustment can advantageously be formed from the start-up of the fire alarm system or also at predeterminable time intervals from several successive measured values of the smoke detector idle values and the respective mean flow velocity values.
  • the calibration or the individual setting of the measuring chamber takes place automatically when the device is switched on, i.e. during the commissioning of the fire alarm system, and can also be repeated at predetermined intervals, so that even a change in the idle value of the smoke detectors has no disruptive influence.
  • Another advantage is that changes in the smoke detector behavior can be taken into account when the rest value is formed.
  • the components and the method of the known pulse alarm system can be used in an advantageous manner, so that component aging or slow contamination of an individual detector is also taken into account by the rest value of the smoke detector and accordingly also the mean value of the each sensor for the flow velocity measurement can be tracked.
  • the individual display of the smoke detector it is also possible to display the relevant exhaust pipe in the event of a fault.

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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)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Claims (4)

1. Procédé pour indentifier de façon précoce un incendie dans une installation d'avertissement d'incendie comportant un système d'aspiration, qui possède au moins une chambre de mesure comportant un détecteur de fumée et plusieurs tubes d'aspiration ainsi qu'un central comportant un dispositif de traitement des données, et selon lequel dans chaque tube d'aspiration se trouve disposé un capteur de la vitesse d'écoulement, qui délivre un signal électrique en fonction de la vitesse d'écoulement mesurée, caractérisé par le fait que les valeurs analogiques de mesure de chaque capteur de vitesse sont interrogées de façon régulière à partir du central, qu'une valeur de mesure de la vitesse d'écoulement est mémorisée dans le central pour chaque capteur de la vitesse d'écoulement, une signalisation d'une perturbation étant délivrée lorsque la valeur de mesure instantanée de la vitesse d'écoulement s'écarte, d'une valeur pouvant être prédéterminée, par rapport à la valeur moyenne correspondante, que le détecteur de fumée est formé par un capteur de mesure qui exécute la mesure d'une valeur analogique et dont la valeur de mesure analogique est interrogée régulièrement à partir du central, une valeur de repos du détecteur de fumée étant formée et mémorisée dans le central et une signalisation d'alarme étant dérivée des valeurs de mesure interrogées lorsque la valeur de mesure interrogée du capteur de fumée s'écarte par le bas ou par le haut, de la valeur de repos du détecteur de fumée, d'une valeur pouvant être prédéterminée, qui constitue le seuil d'alarme, et que la valeur du seuil d'alarme peut être modifiée en fonction des valeurs de mesure déterminées de la vitesse d'écoulement.
2. Procédé suivant la revendication 1, caractérisé par le fait que lors de la mise en service de l'installation d'avertissement d'incendie ou à des intervalles de temps prédéterminés, la valeur de repos du détecteur de fumée et les valeurs moyennes de la vitesse d'écoulement sont formées à partir de valeurs de mesure successives.
3. Procédé suivant la revendication 1 ou 2, caractérisé par le fait que lors de la mise en service de l'installation d'avertissement d'incendie, des valeurs assez élevées de mesure de la vitesse d'écoulement provoquent une réduction du seuil d'alarme.
4. Procédé suivant l'une des revendications précédentes, caractérisé par le fait que, dans le cas de la signalisation d'une perturbation, le tube d'aspiration concerné est affiché.
EP86103608A 1985-03-20 1986-03-18 Agencement pour détecteur d'incendie avec un système d'aspiration Expired - Lifetime EP0197371B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103608T ATE49484T1 (de) 1985-03-20 1986-03-18 Brandmeldeanlage mit einem absaugsystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3510100 1985-03-20
DE3510100 1985-03-20

Publications (2)

Publication Number Publication Date
EP0197371A1 EP0197371A1 (fr) 1986-10-15
EP0197371B1 true EP0197371B1 (fr) 1990-01-10

Family

ID=6265823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103608A Expired - Lifetime EP0197371B1 (fr) 1985-03-20 1986-03-18 Agencement pour détecteur d'incendie avec un système d'aspiration

Country Status (3)

Country Link
EP (1) EP0197371B1 (fr)
AT (1) ATE49484T1 (fr)
DE (1) DE3668247D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11609144B2 (en) 2020-05-08 2023-03-21 Carrier Corporation Detection of leakage in an aspirating fire detection system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4428694C2 (de) 1994-08-12 1996-06-20 Wagner Alarm Sicherung Luftdruckkompensierte Branderkennungsvorrichtung und Verfahren
DE10231230B4 (de) * 2002-05-13 2004-07-22 F & B GmbH Feuerschutz & Brandbekämpfung Wassersprühnebel-System zur Brandort-Lokalisierung
AU2003902318A0 (en) 2003-05-14 2003-05-29 Vision Fire And Security Pty Ltd Improved Sensing Apparatus And Method
ATE498169T1 (de) 2003-09-24 2011-02-15 Xtralis Technologies Ltd Verfahren und vorrichtung zur bestimmung des betriebszustands von verschmutzungsüberwachungseinrichtungen
DE102004044094A1 (de) * 2004-09-09 2006-03-30 Hekatron Vertriebs Gmbh Ansaugender Brandmelder und Verfahren zu dessen Betrieb
US7504962B2 (en) 2005-11-22 2009-03-17 Joseph Stephen Smith Apparatus for enclosing a smoke detector
US20100194575A1 (en) * 2009-01-30 2010-08-05 Carlos Pedrejon Rodriguez Dual channel aspirated detector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1232841A (fr) * 1968-05-09 1971-05-19
US4254414A (en) * 1979-03-22 1981-03-03 The United States Of America As Represented By The Secretary Of The Navy Processor-aided fire detector
DE3127324A1 (de) * 1981-07-10 1983-01-27 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur erhoehung der ansprechempfindlichkeit und der stoersicherheit in einer gefahren-, insbesondere brandmeldeanlage
FR2518287A1 (fr) * 1981-12-10 1983-06-17 Cerberus Guinard Installation de prelevement de fluides a l'etat gazeux, notamment pour detecteur de fumees

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11609144B2 (en) 2020-05-08 2023-03-21 Carrier Corporation Detection of leakage in an aspirating fire detection system

Also Published As

Publication number Publication date
DE3668247D1 (de) 1990-02-15
EP0197371A1 (fr) 1986-10-15
ATE49484T1 (de) 1990-01-15

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