EP0197371A1 - Fire detector arrangement with a suction system - Google Patents
Fire detector arrangement with a suction system Download PDFInfo
- Publication number
- EP0197371A1 EP0197371A1 EP86103608A EP86103608A EP0197371A1 EP 0197371 A1 EP0197371 A1 EP 0197371A1 EP 86103608 A EP86103608 A EP 86103608A EP 86103608 A EP86103608 A EP 86103608A EP 0197371 A1 EP0197371 A1 EP 0197371A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- smoke detector
- flow
- measured
- measured values
- 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.)
- Granted
Links
- 239000000779 smoke Substances 0.000 claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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 fire alarm system with an exhaust system according to the preamble of claim 1.
- Extraction 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, spatially cramped 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 stem form 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 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. Therefore, an extremely 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 relevant location are poorly or not at all recognized.
- the object of the invention is therefore to avoid the disadvantages described above in a fire detection system with a suction system and to provide measures for a fire detection system that do not require special, highly sensitive and expensive fire detectors and with which a complex adjustment of the detectors and the vacuum in the Measuring chamber is omitted.
- a sensor is also arranged in each suction tube and measures the flow rate. This analog measured value for the flow velocity is also queried regularly from the control center. A flow velocity mean value is formed and stored in the control center for each flow velocity sensor. The queried 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 fire alarm system according to the invention with an extraction system has the following advantages.
- the smoke detector idle value and the respective mean flow velocity value can be advantageously formed when the fire alarm system is started up or at predeterminable time intervals from several successive measured values.
- the calibration or the individual setting of the measuring chamber takes place automatically when the system 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 detector has no disruptive influence.
- the flow velocity measured values are used to control the alarm threshold during the commissioning of the fire alarm system.
- the amount of the alarm threshold is changed depending on the measured flow velocity measured values, e.g. an increase in the flow rate reduces the amount of the alarm threshold.
- 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)
Abstract
Description
Die Erfindung bezieht sich auf eine Brandmeldeanlage mit einem Absaugsystem gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a fire alarm system with an exhaust system according to the preamble of claim 1.
Zur Branderkennung unter speziellen Bedingungen, wie sie beispielsweise in Lager-oder Fabrikhallen, Hochregallagern oder Flugzeughallen, gegeben sind, werden Absaugsysteme verwendet. Maßgebend für den Einsatz ist in der Regel, daß die Meßstellen, also die Orte, wo die Brandmelder anzuordnen wären, unzugänglich, räumlich beengt oder in sehr hohen Räumen zu hoch angeordnet sind, so daß normale Punktmelder nicht verwendet werden können.Extraction systems are used for fire detection under special conditions, such as those found in warehouses or factories, high-bay warehouses or aircraft halls. As a rule, the decisive factor for use is that the measuring points, i.e. the places where the fire detectors should be arranged, are inaccessible, spatially cramped or too high in very high rooms, so that normal point detectors cannot be used.
Eine Brandmeldeanlage mit einem Absaugsystem besteht im allgemeinen aus einem oder mehreren Absaugrohren, die stemförmig an eine Meßkammer angeschlossen sind. In der Meßkammer befindet sich ein Ventilator, der die Luft durch die Rohre über einen ebenfalls in der Meßkammer angeordneten Rauchmelder saugt. Die gegebenenfalls rauchhaltige Luft tritt über geeignete Ansaugöffnungen in den Ansaugrohren in das Absaugsystem ein. Bei hinreichend großer Rauchkonzentration spricht der Brandmelder an, so daß die dazugehörige Zentrale einen Alarm geben kann.A fire alarm system with an exhaust system generally consists of one or more exhaust pipes, which are connected in stem form to a measuring chamber. In the measuring chamber there is 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.
Bei den bisher bekannten Brandmeldeanlagen mit einem Absaugsystem ergeben sich in nachteiliger Weise einige Schwierigkeiten. Der Rauchmelder benötigt eine der jeweiligen Konfiguration angepaßte hohe Ansprech empfindlichkeit, weil bereits Rauch, der durch ein oder mehrere Ansaugöffnungen eindringt, erkannt werden soll, obgleich dieser durch die in die anderen Öffnungen strömende reine Luft verdünnt wird. Daher ist eine äußerst diffizile Einstellung des Rauchmelders erforderlich. Eine zuverlässige Funktion ist aber auch nur dann sichergestellt, wenn tatsächlich alle Öffnungen für den Lufteintritt frei sind. Bereits eine geringfügige Erhöhung des Strömungswiderstandes kann eine Verlagerung des Ansaugens auf andere Rohre oder Öffnungen bewirken, so daß Brände an der betreffenden Stelle - schlecht oder gar nicht erkannt werden.In the previously known fire alarm systems with an exhaust system, there are some difficulties. The smoke detector needs a high sensitivity 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. Therefore, an extremely difficult setting of the smoke detector is required. However, 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 relevant location are poorly or not at all recognized.
In derartigen Brandrneldeanlagen werden daher zur Detektion im Absaugsystem in der Regel spezielle, hochempfindliche Rauchmelder eingesetzt, die vor Ort in ihrer Empfindlichkeit einreguliert werden müssen. Diese Melder sind naturgemäß relativ teuer und bedingen einen hohen Justageaufwand. Zur Überwachung des Lufteintritts wird im allgemeinen der Unterdruck in der Meßkammer bestimmt. Auch hierfür ist eine hohe Meßgenauigkeit erforderlich, um einerseits einzelne verstopfte Ansaugöffnungen erkennen zu können und andererseits unnötige Fehlmeldungen der Überwachungsschaltung zu vermeiden. Die daher notwendige individuelle Einstellung vor Ort führt zu hohen Kosten.In fire detection systems of this type, special, highly sensitive smoke detectors are therefore generally used for detection in the extraction system, and their sensitivity must be adjusted on site. Naturally, these detectors are relatively expensive and require a lot of adjustment. In order to monitor the air inlet, the vacuum in the measuring chamber is generally determined. This also requires a high level of measurement accuracy, on the one hand to be able to identify individual blocked suction openings and on the other hand to avoid unnecessary error messages from the monitoring circuit. The necessary individual setting on site leads to high costs.
Aufgabe der Erfindung ist es daher, bei einer eingangs genannten Brandmeldeanlage mit einem Absaugsystem die oben geschilderten Nachteile zu vermeiden und Maßnahmen für eine Brandmeldeanlage anzugeben, die keine speziellen, hochempfindlichen und teueren Brandmelder erfordem und mit denen eine aufwendige Einstellung der Melder und des Unterdrucks in der Meßkammer entfällt.The object of the invention is therefore to avoid the disadvantages described above in a fire detection system with a suction system and to provide measures for a fire detection system that do not require special, highly sensitive and expensive fire detectors and with which a complex adjustment of the detectors and the vacuum in the Measuring chamber is omitted.
Diese Aufgabe wird erfindungsgemäß bei einer eingangs geschilderten Brandmeldeanlage mit den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst. Dabei wird von einer Brandmeideanlage ausgegangen, die eine Zentrale mit einer Datenverarbeitungseinrichtung aufweist, zu der die Meßwerte der Rauchmelder übertragen werden, und in der die einzelnen Meßwerte verarbeitet werden, so daß daraus eine Alarmmeldung abgeleitet werden kann. Der Rauchmelder der Meßkammer ist von einem Rauchsensor gebildet, der von der Zentrale aus regelmäßig auf seinen analogen Meldermeßwert abgefragt wird. In der Zentrale wird für den betreffenden Rauchmelder ein Ruhewert gebildet und gespeichert. Aus den abgefragten Meßwerten wird durch Vergleich mit dem gespeicherten Ruhewert eine Alarmmeldung abgeleitet, wenn der abgefragte Meßwert des betreffenden Rauchmelders den entsprechenden Rauchmefder-Ruhewert um einen vorgegebenen Betrag, die einstellbare Alarmschwelle, unter-bzw. überschreitet. Femer ist in jedem Absaugrohr ein Sensor angeordnet, der die Strömungsgeschwindigkeit mißt. Dieser analoge meßwert für die Strömungsgeschwindigkeit wird ebenfalls regelmäßig von der Zentrale aus abgefragt. In der Zentrale wird für jeden Strömungsgeschwindigkeits-Sensor ein Strömungsgeschwindigkeits-Mittefwert gebildet und gespeichert. Die abgefragten Strömungsgeschwindigkeits-Meßwerte werden mit dem entsprechenden Mittelwert verglichen, weicht der abgefragte Meßwert um einen vorgegebenen Betrag ab, so wird eine Störungsmeldung abgegeben.This object is achieved according to the invention in a fire alarm system described at the outset with the characterizing features of patent claim 1. It is assumed that there is a fire prevention system which has a control center with a data processing device, to which the measured values of the smoke detectors are transmitted and in which the individual measured values are processed, so that an alarm message can be derived therefrom. The smoke detector in the measuring chamber is formed by a smoke sensor, which is regularly queried from the central station for its analog detector measurement value. A quiescent value is formed and stored in the control center for the smoke detector in question. An alarm message is derived from the queried measured values by comparison with the stored idle value when the queried measured value of the relevant smoke detector undershoots the corresponding smoke detector idle value by a predetermined amount, the adjustable alarm threshold. exceeds. A sensor is also arranged in each suction tube and measures the flow rate. This analog measured value for the flow velocity is also queried regularly from the control center. A flow velocity mean value is formed and stored in the control center for each flow velocity sensor. The queried 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.
Die erfindungsgemäße Brandmeldeanlage mit einem Absaugsystem hat dabei folgende Vorteile.The fire alarm system according to the invention with an extraction system has the following advantages.
Mit der Erfassung der Strömungsgeschwindigkeit in den einzelnen Absaugrohren und durch die Auswertung der analogen Meßwerte sowohl des Rauchmelders als auch der Geschwindigkeitssensoren in der Zentrale sind keine individuellen Einstellungen, die diffizil und kostenintensiv sind, weder des Rauchmelders noch der Strömungssensoren in der Meßkammer vor Ort erforderlich. Damit entfallen sämtliche Einstellmittel und Einstellarbeiten vor Ort. Die Einstellung und der Abgleich erfolgt mit Hilfe der Datenverarbeitungseinrichtung in der Zentrale.With the detection of the flow velocity in the individual suction pipes and through the evaluation of the analogue measured values of both the smoke detector and the speed sensors in the control center, there are none Individual settings, which are difficult and costly, are not required for the smoke detector or the flow sensors in the measuring chamber on site. This eliminates all setting means and setting work on site. The setting and the adjustment takes place with the help of the data processing device in the central office.
Dazu kann in vorteilhafter Weise mit der Inbetriebnahme der Brandmeldeanlage oder auch in vorgebbaren Zeitabständen aus mehreren aufeinanderfolgenden Meßwerten der Rauchmelder-Ruhewert und der jeweilige Strömungsgeschwindigkeits-Mittelwert gebildet werden. Es erfolgt also automatisch das Abgleichen bzw. das individuelle Einstellen der Meßkammer mit dem Einschalten, also während der Inbetriebnahme der Brandmeldeanlage, und kann auch in vorgegebenen Abständen wiederholt werden, so daß auch eine Veränderung des Ruhewerts des Rauchmelders keinen störenden Einfluß hat.For this purpose, the smoke detector idle value and the respective mean flow velocity value can be advantageously formed when the fire alarm system is started up or at predeterminable time intervals from several successive measured values. The calibration or the individual setting of the measuring chamber takes place automatically when the system 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 detector has no disruptive influence.
In einer Weiterbildung der Erfindung werden die Strömungsgeschwindigkeits-Meßwerte während der Inbetriebnahme der Brandmeldeanlage zur Steuerung der Alarmschwelle herangezogen. Dabei wird der Betrag der Alarmschwelle in Abhängigkeit von den ermittelten Strömungsgeschwindigkeit Meßwerten verändert, wobei z.B. eine Vergrößerung der Strömungsgeschwindigkeit den Betrag der Alarmschwelle verringert. Dies hat den Vorteil, daß ohne manuelle Einstellung ein Absaugsystem mit vielen Ansaugöffnungen, also hoher Strömungsgeschwindigkeit, ebenso empfindlich auf Rauch an einer Öffnung reagiert wie Absaugsysteme mit weniger Ansaugöffnungen, also niedriger Strömungsgeschwindigkeit.In a further development of the invention, the flow velocity measured values are used to control the alarm threshold during the commissioning of the fire alarm system. The amount of the alarm threshold is changed depending on the measured flow velocity measured values, e.g. an increase in the flow rate reduces the amount of the alarm threshold. This has the advantage that, without manual adjustment, a suction system with many suction openings, that is to say a high flow rate, is just as sensitive to smoke at an opening as suction systems with fewer suction openings, that is to say a low flow rate.
Ein weiterer Vorteil besteht darin, wie oben - schon erwähnt, daß mit der Neubildung des Ruhewerts Veränderungen im Rauchmelderverhalten berücksichtigt werden können. Bei der erfindungsgemäßen Brandmeldeanlage mit Absaugsystem können in vorteilhafter Weise die Komponenten und das Verfahren des bekannten Puls-Melde-Systems verwendet werden, so daß auch eine Bauteilealterung oder langsame Verschmutzung eines einzelnen Melders berücksichtigt wird, indem der Ruhewert des Rauchmelders und entsprechend auch der Mittelwert des jeweiligen Sensors für die Strömungsgeschwindigkeitsmessung nachgeführt werden kann. Dabei ist es neben der individuellen Anzeige des Rauchmelders möglich, im Störungsfall auch das betreffende Absaugrohr anzuzeigen.Another advantage, as already mentioned above, is that changes in the smoke detector behavior can be taken into account when the rest value is formed. In the fire alarm system according to the invention with an extraction system, 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. In addition to the individual display of the smoke detector, it is also possible to display the relevant exhaust pipe in the event of a fault.
Claims (5)
dadurch gekennzeichnet, daß der Rauchmelder von einem analogwertmessenden Rauchsensor gebildet ist, der von der Zentrale aus regelmäßig auf seinen analogen Meßwert abgefragt wird, wobei in der Zentrale ein Rauchmelder-Ruhewert gebildet und gespeichert wird und aus den abgefragten Meßwerten eine Alarmmeldung abgeleitet wird, wenn der abgefragte Meßwert des Rauchsensors den Rauchmelder-Ruhewert um einen vorgebbaren Betrag, der die Alarmschwelle bildet, unter-bzw. überschreitet,
daß in jedem Absaugrohr ein StrömungsgeschwindigkeitsSensor angeordnet ist, der von der Zentrale aus regelmäßig auf seine analogen Meßwerte abgefragt wird, wobei in der Zentrale für jeden Strömungsgeschwindigkeits-Sensor ein Strömungsgeschwindigkeits-Mittelwert gebildet und gespeichert wird,
und daß eine Störungsmeldung abgegeben wird, wenn der momentane Meßwert der Strömungsgeschwindigkeit von dem entsprechenden Mittelwert um einen vorgebbaren Betrag abweicht.1. Fire alarm system with an extraction system, which has at least one measuring chamber with a smoke detector and several extraction pipes, and a control center with a data processing device,
characterized in that the smoke detector is formed by a smoke sensor which measures the analog value and is regularly queried for its analog measured value from the control center, a smoke detector idle value being formed and stored in the control center and an alarm message being derived from the measured values queried when the queried measured value of the smoke sensor below or below the rest value of the smoke detector by a predeterminable amount which forms the alarm threshold. exceeds
that a flow rate sensor is arranged in each suction pipe and is regularly queried for its analog measured values from the control center, an average flow rate value being formed and stored in the control center for each flow rate sensor,
and that a fault message is given if the current measured value of the flow velocity deviates from the corresponding mean value by a predeterminable amount.
dadurch gekennzeichnet, daß mit der Inbetriebnahme der Brandmeldeanlage oder in vorgegebenen Zeitabständen aus mehreren aufeinanderfolgenden Meßwerten der Rauchmelder-Ruhewert und die Strömungsgeschwindigkeits-Mittelwerte gebildet werden.2. Fire alarm system according to claim 1,
characterized in that when the fire alarm system is started up or at predetermined time intervals, the smoke detector idle value and the flow rate mean values are formed from several successive measured values.
dadurch gekennzeichnet, daß der Betrag der Alarmschwelle in Abhängigkeit von den ermittelten Strömungsgeschwindigkeits-Meßwerten
veränderbar ist.3. Fire alarm system according to claim 1 or 2,
characterized in that the amount of the alarm threshold as a function of the measured flow velocity measured values
is changeable.
dadurch gekennzeichnet, daß mit der Inbetriebnahme der Brandmeldeanlage größere Strömungsgeschwindigkeits-Meßwerte eine Absenkung der Alarmschwelle bewirken.4. Fire alarm system according to claim 3,
characterized in that when the fire alarm system is started up, larger flow velocity measured values lower the alarm threshold.
dadurch gekennzeichnet, daß bei einer Störungsmeldung das betreffende Absaugrohr angezeigt wird.5. Fire alarm system according to one of the previous ones Expectations,
characterized in that the suction pipe in question is displayed in the event of a fault message.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86103608T ATE49484T1 (en) | 1985-03-20 | 1986-03-18 | FIRE DETECTION SYSTEM WITH AN EXHAUST SYSTEM. |
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 true EP0197371A1 (en) | 1986-10-15 |
EP0197371B1 EP0197371B1 (en) | 1990-01-10 |
Family
ID=6265823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86103608A Expired - Lifetime EP0197371B1 (en) | 1985-03-20 | 1986-03-18 | Fire detector arrangement with a suction system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0197371B1 (en) |
AT (1) | ATE49484T1 (en) |
DE (1) | DE3668247D1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0696787A1 (en) | 1994-08-12 | 1996-02-14 | Wagner Alarm- und Sicherungssysteme GmbH | Fire detecting device and method with air-pressure compensation |
DE10231230A1 (en) * | 2002-05-13 | 2004-02-05 | F & B GmbH Feuerschutz & Brandbekämpfung | Water sprinkler system for fire fighting in road tunnels has fire detector and sprinklers arranged in sections along tunnel with spray heads at intervals with nozzles to produce water with impulse type flows forming hollow cone water sprays |
EP1627366A1 (en) | 2003-05-14 | 2006-02-22 | Vision Fire & Security Pty Ltd. | Improved sensing apparatus and method |
EP1638062A1 (en) * | 2004-09-09 | 2006-03-22 | HEKATRON Technik GmbH | Aspirating smoke detector and method of its operation |
EP1665189A1 (en) * | 2003-09-24 | 2006-06-07 | Vision Fire & Security Pty Ltd. | Method and apparatus for determining operational condition of pollution monitoring equipment |
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 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3907484B1 (en) | 2020-05-08 | 2023-08-30 | Carrier Corporation | Detection of leakage in an aspirating fire detection system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1232841A (en) * | 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 |
EP0070449A1 (en) * | 1981-07-10 | 1983-01-26 | Siemens Aktiengesellschaft | Method and device for increasing the reaction sensitivity and the disturbance security in a hazard, particularly a fire alarm installation |
FR2518287A1 (en) * | 1981-12-10 | 1983-06-17 | Cerberus Guinard | Electrical conductor free smoke detector pipe networks - includes air flow sensor to indicate blockage of any air sampling holes in network using wheatstone bridge and heating resistors |
-
1986
- 1986-03-18 DE DE8686103608T patent/DE3668247D1/en not_active Expired - Fee Related
- 1986-03-18 AT AT86103608T patent/ATE49484T1/en active
- 1986-03-18 EP EP86103608A patent/EP0197371B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1232841A (en) * | 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 |
EP0070449A1 (en) * | 1981-07-10 | 1983-01-26 | Siemens Aktiengesellschaft | Method and device for increasing the reaction sensitivity and the disturbance security in a hazard, particularly a fire alarm installation |
FR2518287A1 (en) * | 1981-12-10 | 1983-06-17 | Cerberus Guinard | Electrical conductor free smoke detector pipe networks - includes air flow sensor to indicate blockage of any air sampling holes in network using wheatstone bridge and heating resistors |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0696787A1 (en) | 1994-08-12 | 1996-02-14 | Wagner Alarm- und Sicherungssysteme GmbH | Fire detecting device and method with air-pressure compensation |
DE10231230A1 (en) * | 2002-05-13 | 2004-02-05 | F & B GmbH Feuerschutz & Brandbekämpfung | Water sprinkler system for fire fighting in road tunnels has fire detector and sprinklers arranged in sections along tunnel with spray heads at intervals with nozzles to produce water with impulse type flows forming hollow cone water sprays |
DE10231230B4 (en) * | 2002-05-13 | 2004-07-22 | F & B GmbH Feuerschutz & Brandbekämpfung | Water spray system for localizing the location of the fire |
EP2278567A2 (en) | 2003-05-14 | 2011-01-26 | VFS Technologies Limited | Improved sensing apparatus and method |
EP1627366A1 (en) | 2003-05-14 | 2006-02-22 | Vision Fire & Security Pty Ltd. | Improved sensing apparatus and method |
US8224621B2 (en) | 2003-05-14 | 2012-07-17 | Vision Fire & Security Pty Ltd | Sensing apparatus and method |
US8892399B2 (en) | 2003-05-14 | 2014-11-18 | Xtralis Technologies Ltd | Sensing apparatus and method |
EP1627366B1 (en) * | 2003-05-14 | 2015-04-22 | Xtralis Technologies Ltd | Improved sensing apparatus and method |
US9746363B2 (en) | 2003-05-14 | 2017-08-29 | Garrett Thermal Systems Limited | Sensing apparatus and method |
EP1665189A1 (en) * | 2003-09-24 | 2006-06-07 | Vision Fire & Security Pty Ltd. | Method and apparatus for determining operational condition of pollution monitoring equipment |
EP1665189A4 (en) * | 2003-09-24 | 2008-06-18 | Vfs Technologies Ltd | Method and apparatus for determining operational condition of pollution monitoring equipment |
US8412481B2 (en) | 2003-09-24 | 2013-04-02 | Vision Fire & Security Pty Ltd | Method and apparatus for determining operational condition of pollution monitoring equipment |
EP1638062A1 (en) * | 2004-09-09 | 2006-03-22 | HEKATRON Technik GmbH | Aspirating smoke detector and method of its operation |
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 |
Also Published As
Publication number | Publication date |
---|---|
DE3668247D1 (en) | 1990-02-15 |
ATE49484T1 (en) | 1990-01-15 |
EP0197371B1 (en) | 1990-01-10 |
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