EP1783713B1 - Tamper-proofing for a fire detector - Google Patents

Tamper-proofing for a fire detector Download PDF

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Publication number
EP1783713B1
EP1783713B1 EP05110342A EP05110342A EP1783713B1 EP 1783713 B1 EP1783713 B1 EP 1783713B1 EP 05110342 A EP05110342 A EP 05110342A EP 05110342 A EP05110342 A EP 05110342A EP 1783713 B1 EP1783713 B1 EP 1783713B1
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EP
European Patent Office
Prior art keywords
light
sensor unit
fire
fire detector
receiver
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.)
Not-in-force
Application number
EP05110342A
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German (de)
French (fr)
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EP1783713A1 (en
Inventor
Kurt Müller
Peter Steiner
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
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Siemens AG
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Filing date
Publication date
Priority to ES05110342T priority Critical patent/ES2306026T3/en
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP05110342A priority patent/EP1783713B1/en
Priority to DE502005004298T priority patent/DE502005004298D1/en
Priority to AT05110342T priority patent/ATE397261T1/en
Priority to PCT/EP2006/068035 priority patent/WO2007051819A1/en
Priority to US12/089,787 priority patent/US7812708B2/en
Priority to CN2006800411676A priority patent/CN101300612B/en
Publication of EP1783713A1 publication Critical patent/EP1783713A1/en
Application granted granted Critical
Publication of EP1783713B1 publication Critical patent/EP1783713B1/en
Not-in-force legal-status Critical Current
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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/043—Monitoring of the detection circuits of fire detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a method for distinguishing a fire from a manipulation in a sensor unit comprising at least two light sources and a light receiver and a cover plate with fire detectors comprising at least two light emission and entrance windows, with at least one fire characteristic in the exterior of the fire detector the scattered light method is monitored
  • the DE 199 1 911 A1 discloses a device for detecting smoke, for example in a room, comprising a transmitter for emitting a radiation which can be reflected by the smoke, and a receiver which detects the radiation reflected by the smoke and a cover which transmits a beam emitted by the transmitter. It is further disclosed how it can be detected that the cover was either soiled or covered. For this purpose, a further transceiver unit is used, which measures the reflected radiation from the inside of the cover.
  • Each attached to the ceiling of a structurally limited space optical fire detector which has no closed measuring chamber, so receives stray light from the outside of the fire detector can be blocked or manipulated by large-scale objects such as a hand, cleaning instruments, etc., that, for example Either no monitoring of a fire characteristic by the fire alarm can be done more or a false alarm due to false information such as water vapor, fog, etc., which are interpreted as a fire characteristic size of the fire alarm triggered.
  • Such manipulations must be clear from smoke or a fire can be distinguished, so that a secure monitoring of a structurally limited space is guaranteed.
  • Fire detectors which are a fire characteristic according to the scattered light method on the outside of the fire detector, generally consist of at least two sensor units, each consisting of a transmitting and a receiver unit and can be integrated in the ceiling or fixed to the ceiling.
  • a cover plate is used with entrance and exit windows for the light. If the manipulation is close to an exit window, the fire detector can detect this by the scattered light. Is the manipulation however, on the exit window or if it is even steam, additional measures must be taken.
  • the object of the present invention is to provide the simplest and most efficient way for the detection of a manipulation of a fire detector, which monitors a fire characteristic size in the outdoor area of the fire detector according to the scattered light method to propose.
  • a core of the invention is to be seen in that to distinguish a fire from a manipulation of a fire detector with at least two sensor units each containing a light source and a light receiver and a cover plate, each with at least two light output and entrance window, with this in the outdoor area of the fire detector at least one fire characteristic is monitored according to the scattered light method.
  • the light emission and light entrance windows are each connected to a light-conducting element in such a way that the light reflected by the light source of the one sensor unit and reflected on the outer surface of the cover is received by the light receiver of the further sensor unit.
  • the light-conducting element for example, a tunnel, a trench and / or a glass fiber connection is used in the cover plate.
  • the light-conducting element can be lined with a light-reflecting material, such as a reflective metal coating to increase efficiency. This is especially necessary when using highly concentrated laser light for the scattered light method is because the backscattered from the outside of the window, so the outer boundary surface of the light exit window, light must be conducted safely into the light guide.
  • the cover plate can be made of plastic, metal, wood, glass, etc.
  • As the light emitted from the light source it is preferable to use high-collimated laser light or other suitable light.
  • the fire detector with the at least two sensor units is attached to the ceiling of the structurally limited space. It can be integrated into the ceiling or mounted on the ceiling.
  • a great advantage of the invention is that it can be easily distinguished from the fire detector, whether a fire or a manipulation exists.
  • the triggering of a false alarm at the fire detector by manipulation for example by covering the light exit window or by steam on the light exit window can be avoided in a very simple manner.
  • FIG. 1 shows a fire detector which monitors a fire characteristic in the outdoor area R of the fire detector BM according to the scattered light method.
  • the fire detector BM has two sensor units SE1, SE2 each with a light source or light-emitting unit S1, S2 and a light-receiver unit E1, E2.
  • optical elements O such as optical lenses, are used.
  • highly concentrated laser light is used to monitor the fire characteristic according to the scattered light method, but is in principle any kind of light imaginable.
  • a cover plate AP is used in the fire detector BM. This cover plate may have any shape such as a round shape.
  • the cover plate AP can be made of wood, metal, plastic, glass, etc., and has light entrance EF and light exit window AF.
  • light conducting elements LL so-called light guides are present, so that the light source S2 is connected to the light receiver E1 and the light source S1 to the light receiver E2.
  • a part of the light reflected on the outer surface of the exit window AF is coupled into the respective light guides LL.
  • only a small amount of light of known intensity is reflected back and conducted via the light guide LL to the receiver E1, E2 of the respective sensor unit SE2, SE1.
  • the associated signal level ie the strength of the received light, can be used as a monitoring signal for the correct operation of the respective transmitter S1, S2.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire Alarms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

The method involves connecting a light exit window (AF) and a light entry window of a cover plate (AP) with a light conducting unit (LL) such that light from a light source of one of two sensor units (SE1, SE2) of a fire alarm (BM) is received with a photo receiver of another sensor unit of the alarm. The light conducting unit is coated with a light reflecting material, and the cover plate is made up of plastic, metal and/or wood. The alarm is fixed on a cover of a constructionally limited space. An independent claim is also included for a fire alarm for differentiating fire from a manipulation of the fire alarm.

Description

Die Erfindung betrifft ein Verfahren zur Unterscheidung eines Brandes von einer Manipulation bei einem mindestens zwei je eine Lichtquelle und einen Lichtempfänger enthaltenden Sensoreinheiten und eine Abdeckplatte mit jeweils mindestens zwei Licht-Aus- und Eintrittsfenster umfassenden Brandmelder, mit dem im Außenbereich des Brandmelders zumindest eine Brandkenngrösse nach dem Streulichtverfahren überwacht wirdThe invention relates to a method for distinguishing a fire from a manipulation in a sensor unit comprising at least two light sources and a light receiver and a cover plate with fire detectors comprising at least two light emission and entrance windows, with at least one fire characteristic in the exterior of the fire detector the scattered light method is monitored

Die DE 199 1 911 A1 offenbart eine Vorrichtung zur Erkennung von Rauch beispielsweise in einem Raum, mit einem Sender zum Aussenden einer von dem Rauch reflektierbaren Strahlung und ein die vom Rauch reflektierten Strahlung erkennender Empfänger und einer Abdeckung, die einen vom Sender ausgesandten Strahl durchlässt. Es wird weiter offenbart, wie detektiert werden kann, dass die Abdeckung entweder verschmutzt oder abgedeckt wurde. Dazu wird eine weitere Sender-EmpfängerEinheit verwendet, welche die von der Innenseite reflektierte Strahlung der Abdeckung misst.The DE 199 1 911 A1 discloses a device for detecting smoke, for example in a room, comprising a transmitter for emitting a radiation which can be reflected by the smoke, and a receiver which detects the radiation reflected by the smoke and a cover which transmits a beam emitted by the transmitter. It is further disclosed how it can be detected that the cover was either soiled or covered. For this purpose, a further transceiver unit is used, which measures the reflected radiation from the inside of the cover.

Jeder an der Decke eines baulich begrenzten Raumes befestigter optischer Brandmelder, der keine geschlossene Messkammer hat, also Streulicht aus dem Außenbereich des Brandmelders empfängt, kann durch großflächige Objekte wie zum Beispiel einer Hand, Putzinstrumente etc. blockiert bzw. derart manipuliert werden, dass zum Beispiel entweder keine Überwachung einer Brandkenngrösse seitens des Brandmelders mehr erfolgen kann oder ein Fehlalarm aufgrund falscher Informationen wie zum Beispiel Wasserdampf, Nebel etc., die als Brandkenngrösse vom Brandmelder interpretiert werden, ausgelöst wird. Derartige Manipulationen müssen klar von Rauch bzw. einem Brand unterschieden werden können, damit eine sichere Überwachung eines baulich begrenzten Raumes gewährleistet ist. Brandmelder, die eine Brandkenngrösse nach dem Streulichtverfahren im Außenbereich des Brandmelders, bestehen im Allgemeinen aus mindestens zwei Sensoreinheiten, die je aus einer Sende- und einer Empfängereinheit bestehen und in die Decke integriert oder auf der Decke befestigt sein können. Zum Schutz der Sensoreinheiten wird meist eine Abdeckplatte mit Ein- und Austrittsfenstern für das Licht verwendet. Ist die Manipulation in der Nähe eines Austrittsfensters, so kann der Brandmelder dies u. a. durch das Streulicht feststellen. Liegt die Manipulation jedoch auf dem Austrittsfenster auf oder handelt es sich gar um Dampf, so müssen zusätzliche Massnahmen getroffen werden.Each attached to the ceiling of a structurally limited space optical fire detector, which has no closed measuring chamber, so receives stray light from the outside of the fire detector can be blocked or manipulated by large-scale objects such as a hand, cleaning instruments, etc., that, for example Either no monitoring of a fire characteristic by the fire alarm can be done more or a false alarm due to false information such as water vapor, fog, etc., which are interpreted as a fire characteristic size of the fire alarm triggered. Such manipulations must be clear from smoke or a fire can be distinguished, so that a secure monitoring of a structurally limited space is guaranteed. Fire detectors, which are a fire characteristic according to the scattered light method on the outside of the fire detector, generally consist of at least two sensor units, each consisting of a transmitting and a receiver unit and can be integrated in the ceiling or fixed to the ceiling. To protect the sensor units usually a cover plate is used with entrance and exit windows for the light. If the manipulation is close to an exit window, the fire detector can detect this by the scattered light. Is the manipulation however, on the exit window or if it is even steam, additional measures must be taken.

Die Aufgabe der vorliegenden Erfindung ist darin zu sehen, eine möglichst einfache und effiziente Möglichkeit für die Erkennung einer Manipulation eines Brandmelders, der im Außenbereich des Brandmelders eine Brandkenngrösse nach dem Streulichtverfahren überwacht, vorzuschlagen.The object of the present invention is to provide the simplest and most efficient way for the detection of a manipulation of a fire detector, which monitors a fire characteristic size in the outdoor area of the fire detector according to the scattered light method to propose.

Die Aufgabe wird erfindungsgemäß jeweils durch die Gegenstände der unabhängigen Patentansprüche gelöst. Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved in each case by the subject matters of the independent claims. Further developments of the invention are specified in the subclaims.

Ein Kern der Erfindung ist darin zu sehen, dass zur Unterscheidung eines Brandes von einer Manipulation eines Brandmelders mit mindestens zwei je eine Lichtquelle und einen Lichtempfänger enthaltenden Sensoreinheiten und eine Abdeckplatte mit jeweils mindestens zwei Licht-Aus- und Eintrittsfenster, mit diesem im Außenbereich des Brandmelders zumindest eine Brandkenngrösse nach dem Streulichtverfahren überwacht wird. Erfindungsgemäss sind bei der Abdeckplatte jeweils die Licht-Aus- und Licht-Eintrittsfenster mit einem Licht leitenden Element derart verbunden, dass das an der Außenfläche der Abdeckung reflektierte von der Lichtquelle der einen Sensoreinheit stammende Licht mit dem Lichtempfänger der weiteren Sensoreinheit empfangen wird. Als Licht leitendes Element wird zum Beispiel ein Tunnel, ein Graben bzw. eine Vertiefung und/oder eine Glasfaserverbindung in der Abdeckplatte verwendet. Dabei kann das Licht leitende Element mit einem Licht reflektierenden Material, wie zum Beispiel einer spiegelnden Metallbeschichtung zur Effizienzsteigerung ausgekleidet werden. Dies ist vor allem dann notwendig, wenn stark gebündeltes Laserlicht für das Streulichtverfahren verwendet wird, da das von der Außenseite des Fensters, also der äußeren Grenzfläche des Licht-Austrittsfensters, zurück gestreute Licht sicher in den Lichtleiter geleitet werden muss. Die Abdeckplatte kann aus Kunststoff, Metall, Holz, Glas etc. bestehen. Als Licht, das von der Lichtquelle ausgesandt wird, kann vorzugsweise stark gebündeltes Laserlicht oder ein anderes dafür geeignetes Licht verwendet werden. Der Brandmelder mit den mindestens zwei Sensoreinheiten wird an der Decke des baulich begrenzten Raumes befestigt. Dabei kann er in die Decke integriert oder auf der Decke montiert werden.A core of the invention is to be seen in that to distinguish a fire from a manipulation of a fire detector with at least two sensor units each containing a light source and a light receiver and a cover plate, each with at least two light output and entrance window, with this in the outdoor area of the fire detector at least one fire characteristic is monitored according to the scattered light method. According to the invention, in the case of the cover plate, the light emission and light entrance windows are each connected to a light-conducting element in such a way that the light reflected by the light source of the one sensor unit and reflected on the outer surface of the cover is received by the light receiver of the further sensor unit. As a light-conducting element, for example, a tunnel, a trench and / or a glass fiber connection is used in the cover plate. In this case, the light-conducting element can be lined with a light-reflecting material, such as a reflective metal coating to increase efficiency. This is especially necessary when using highly concentrated laser light for the scattered light method is because the backscattered from the outside of the window, so the outer boundary surface of the light exit window, light must be conducted safely into the light guide. The cover plate can be made of plastic, metal, wood, glass, etc. As the light emitted from the light source, it is preferable to use high-collimated laser light or other suitable light. The fire detector with the at least two sensor units is attached to the ceiling of the structurally limited space. It can be integrated into the ceiling or mounted on the ceiling.

Ein großer Vorteil der Erfindung besteht darin, dass auf einfache Weise vom Brandmelder unterschieden werden kann, ob ein Brand oder eine Manipulation vorliegt. Insbesondere das Auslösen eines Fehlalarms beim Brandmelder durch eine Manipulation zum Beispiel durch Abdeckung des Licht-Austrittsfensters oder durch Dampf auf dem Licht-Austrittfensters kann auf sehr einfache Art und Weise vermieden werden.A great advantage of the invention is that it can be easily distinguished from the fire detector, whether a fire or a manipulation exists. In particular, the triggering of a false alarm at the fire detector by manipulation, for example by covering the light exit window or by steam on the light exit window can be avoided in a very simple manner.

Die Erfindung wird anhand eines in einer Figur dargestellten Ausführungsbeispiels näher erläutert. Dabei zeigt die folgende Figur eine Anordnung mittels Licht leitende Elemente, die in der Brandmelderabdeckung bzw. Abdeckplatte integriert sind.The invention will be explained in more detail with reference to an embodiment shown in a figure. The following figure shows an arrangement by means of light-conducting elements which are integrated in the fire detector cover or cover plate.

Figur 1 zeigt einen Brandmelder, der nach dem Streulichtverfahren eine Brandkenngrösse im Außenbereich R des Brandmelders BM überwacht. Der Brandmelder BM weißt zwei Sensoreinheiten SE1, SE2 mit je einer Lichtquelle bzw. Licht-Sendeeinheit S1, S2 und einer Licht-Empfängereinheit E1, E2 auf. Zur Licht-Strahlenbündelung werden Optikelemente O wie zum Beispiel optische Linsen verwendet. Idealerweise wird stark gebündeltes Laserlicht zur Überwachung der Brandkenngrösse gemäss dem Streulichtverfahren verwendet, jedoch ist prinzipiell jede Art von Licht vorstellbar. Zum Abdecken insbesondere zum Schutz der Sensoreneinheiten SE1, SE2 wird beim Brandmelder BM eine Abdeckplatte AP verwendet. Diese Abdeckplatte kann eine beliebige Form wie zum Beispiel eine runde Form haben. Die Abdeckplatte AP kann aus Holz, Metall, Kunststoff, Glas etc. hergestellt werden und besitzt Licht-Eintritt- EF und Licht-Austrittfenster AF. In der Abdeckplatte AP sind Licht leitende Elemente LL, so genannte Lichtleiter vorhanden, sodass die Lichtquelle S2 mit dem Lichtempfänger E1 und die Lichtquelle S1 mit dem Lichtempfänger E2 verbunden ist. Ein Teil des an der äußeren Oberfläche des Austrittfenster AF reflektierten Lichtes wird in die jeweiligen Lichtleiter LL eingekoppelt. Im normalen Betrieb wird nur wenig Licht mit bekannter Stärke zurückgeworfen und über den Lichtleiter LL zum Empfänger E1, E2 der jeweiligen Sensoreinheit SE2, SE1 geleitet. Der zugehörige Signalpegel d. h. die Stärke des empfangenen Lichtes kann als Überwachungssignal für die korrekte Funktion des jeweiligen Senders S1, S2 verwendet werden. Liegt jedoch eine Manipulation oder eine Verschmutzung des Austrittsfensters AF in unzulässiger Weise vor, so wird dieses zusätzliche Licht diffus reflektiert und in den Lichtleiter LL gekoppelt. Auf Grund der Signalzunahme bzw. des Anstiegs der Stärke des am Lichtempfänger E1, E2 empfangenen Lichtes kann dann eine solche Situation (Manipulation) vom Normalbetrieb unterschieden werden. Eine Manipulation des Brandmelders kann also angenommen werden, wenn ein zum Beispiel vorher definierter Schwellwert für die Stärke des am Lichtempfänger E1, E2 empfangenen Lichtes überschritten wird. Da Licht vom einen Austrittsfenster AF auf den Lichtempfänger des anderen Kanals geleitet wird, ist es nun möglich zu unterscheiden ob bei der Überwachung einer Brandkenngrösse tatsächlich ein Brand oder eine Manipulation vorliegt. Als Manipulation wird zum Beispiel die Abdeckung eines Licht-Austrittsfensters AF, Dampf, Nebel etc. angesehen.FIG. 1 shows a fire detector which monitors a fire characteristic in the outdoor area R of the fire detector BM according to the scattered light method. The fire detector BM has two sensor units SE1, SE2 each with a light source or light-emitting unit S1, S2 and a light-receiver unit E1, E2. For light beamforming, optical elements O, such as optical lenses, are used. Ideally, highly concentrated laser light is used to monitor the fire characteristic according to the scattered light method, but is in principle any kind of light imaginable. For covering in particular for the protection of the sensor units SE1, SE2, a cover plate AP is used in the fire detector BM. This cover plate may have any shape such as a round shape. The cover plate AP can be made of wood, metal, plastic, glass, etc., and has light entrance EF and light exit window AF. In the cover plate AP, light conducting elements LL, so-called light guides are present, so that the light source S2 is connected to the light receiver E1 and the light source S1 to the light receiver E2. A part of the light reflected on the outer surface of the exit window AF is coupled into the respective light guides LL. In normal operation, only a small amount of light of known intensity is reflected back and conducted via the light guide LL to the receiver E1, E2 of the respective sensor unit SE2, SE1. The associated signal level, ie the strength of the received light, can be used as a monitoring signal for the correct operation of the respective transmitter S1, S2. However, if manipulation or contamination of the exit window AF in an inadmissible manner before, this additional light is diffusely reflected and coupled into the light guide LL. Due to the signal increase or increase in the strength of the light received at the light receiver E1, E2, such a situation (manipulation) can then be distinguished from the normal operation. A manipulation of the fire detector can therefore be assumed if, for example, a previously defined threshold value for the intensity of the light received at the light receiver E1, E2 is exceeded. Since light is passed from one exit window AF to the light receiver of the other channel, it is now possible to distinguish whether there is actually a fire or a manipulation in the monitoring of a fire characteristic. As a manipulation, for example, the coverage of a light-exit window AF, steam, fog, etc. is considered.

Claims (9)

  1. Method for distinguishing a fire from a manipulation in a fire detector (BM), wherein at least one fire parameter is monitored according to the scattered light method in the region surrounding the fire detector (BM), with two sensor units (SE1, SE2), which each contain one light source (S1, S2) and one light receiver (E1, E2), and with a cover plate (AP) having in each case at least two light exit (AF) and entrance windows (EF),
    characterized in that
    in the cover plate (AP), the at least two light exit (AF) and light entrance windows (EF) are connected to a light-guiding element (LL) such that the light source (S1) of the first sensor unit (SE1) is connected to the light receiver (E2) of the second sensor unit (SE2) and the light source (S2) of the second sensor unit (SE2) is connected to the light receiver (E1) of the first sensor unit (SE1) and
    in that the light, which is reflected at the external interface of the light exit windows (AF), from the light source (S1, S2) of the one sensor unit (SE1, SE2) is received using the light receiver (E2, E1) of the further sensor unit (SE2, SE1).
  2. Method according to Claim 1,
    characterized in that
    the light-guiding element (LL) used is a tunnel, a trench and/or an optical-fiber connection in the cover plate (AP).
  3. Method according to either Claim 1 or 2,
    characterized in that
    the light-guiding element (LL) is coated with a light-reflecting material.
  4. Method according to one of the preceding claims,
    characterized in that
    the light-guiding element (LL) is coated with a light-reflecting material.
  5. Method according to one of the preceding claims,
    characterized in that
    strongly focused laser light is used as light.
  6. Method according one of the preceding claims,
    characterized in that
    the fire detector (BM) is fastened to the ceiling of a spatially delimited space.
  7. Method according to one of the preceding claims,
    characterized in that
    the intensity of the light received at the light receiver (E1, E2) is measured.
  8. Method according to Claim 7,
    characterized in that
    a manipulation of the fire detector is assumed if a threshold value is exceeded.
  9. Fire detector (BM) for distinguishing a fire from a manipulation in a fire detector (BM), wherein at least one fire parameter is monitored according to the scattered light method in the region surrounding the fire detector,
    - with two sensor units (SE1, SE2), which each contain one light source (S1, S2) and one light receiver (E1, E2) for transmitting and receiving light,
    - with a cover plate (AP) comprising in each case at least two light exit (AF) and entrance windows (EF) which are connected to a light-guiding element (LL) such that the light source (S1) of the first sensor unit (SE1) is connected to the light receiver (E2) of the second sensor unit (SE2) and the light source (S2) of the second sensor unit (SE2) is connected to the light receiver (E1) of the first sensor unit (SE1),
    - with the light receiver (E2, E1) of the one sensor unit (SE2, SE1) for receiving the light, which is reflected at the external interface of the light exit windows (AF), of the light source (S1, S2) of the further sensor unit (SE1, SE2).
EP05110342A 2005-11-04 2005-11-04 Tamper-proofing for a fire detector Not-in-force EP1783713B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP05110342A EP1783713B1 (en) 2005-11-04 2005-11-04 Tamper-proofing for a fire detector
DE502005004298T DE502005004298D1 (en) 2005-11-04 2005-11-04 Manipulation protection of a fire detector
AT05110342T ATE397261T1 (en) 2005-11-04 2005-11-04 TAMPER PROTECTION OF A FIRE DETECTOR
ES05110342T ES2306026T3 (en) 2005-11-04 2005-11-04 INSURANCE AGAINST THE HANDLING OF A FIRE WARNING.
PCT/EP2006/068035 WO2007051819A1 (en) 2005-11-04 2006-11-02 Manipulation protection for a fire detector
US12/089,787 US7812708B2 (en) 2005-11-04 2006-11-02 Manipulation protection for a fire detector
CN2006800411676A CN101300612B (en) 2005-11-04 2006-11-02 Method for distinguishing operation of fire detector and fire and the fire detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05110342A EP1783713B1 (en) 2005-11-04 2005-11-04 Tamper-proofing for a fire detector

Publications (2)

Publication Number Publication Date
EP1783713A1 EP1783713A1 (en) 2007-05-09
EP1783713B1 true EP1783713B1 (en) 2008-05-28

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EP05110342A Not-in-force EP1783713B1 (en) 2005-11-04 2005-11-04 Tamper-proofing for a fire detector

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US (1) US7812708B2 (en)
EP (1) EP1783713B1 (en)
CN (1) CN101300612B (en)
AT (1) ATE397261T1 (en)
DE (1) DE502005004298D1 (en)
ES (1) ES2306026T3 (en)
WO (1) WO2007051819A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006015553U1 (en) 2006-10-09 2006-12-14 Schako Klima Luft Ferdinand Schad Kg Zweigniederlassung Kolbingen Detecting device for smoke in room has transmitter for transmitting radiation and receiver that detects radiation whereby radiation transparent cover placed over transmitter or receiver is made up of an unbreakable material
DE102007039401B4 (en) * 2007-08-21 2012-07-12 Hekatron Vertriebs Gmbh Smoke detector with contamination monitoring
EP2093732A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Device and method for detecting smoke through joint evaluation of two optical backscattering signals
DE202009015335U1 (en) * 2009-11-09 2010-03-25 Job Lizenz Gmbh & Co. Kg alarm Devices
DE102010039230B3 (en) 2010-08-11 2012-01-26 Siemens Aktiengesellschaft Evaluate scattered light signals in an optical hazard detector and issue a dust / steam warning or a fire alarm
FR2964743B1 (en) 2010-09-14 2015-06-26 Finsecur SMOKE DETECTION CIRCUIT, SMOKE DETECTOR COMPRISING IT, AND ALARM DEVICE COMPRISING SAME.
EP3029647B1 (en) 2014-12-04 2017-05-31 Siemens Schweiz AG Open scattered light smoke detector, particularly with a sidelooker LED
US10600057B2 (en) * 2016-02-10 2020-03-24 Kenexis Consulting Corporation Evaluating a placement of optical fire detector(s) based on a plume model
EP3452998B1 (en) * 2016-05-03 2021-01-06 Autronica Fire & Security AS Automatic cover detection system and method
US20190293556A1 (en) * 2018-03-26 2019-09-26 Kidde Technologies, Inc. Protective cover for chamberless point sensor
US11138853B2 (en) 2019-05-17 2021-10-05 Carrier Corporation Intrusion entry protection

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56100342A (en) * 1980-01-14 1981-08-12 Matsushita Electric Works Ltd Photoelectric type smoke sensor
US4769550A (en) * 1987-07-29 1988-09-06 Quantum Group, Inc. Dual scattering-type smoke detector with cross-checking
JP3163699B2 (en) * 1991-12-25 2001-05-08 キヤノン株式会社 Image recording device
US5576697A (en) * 1993-04-30 1996-11-19 Hochiki Kabushiki Kaisha Fire alarm system
US5568130A (en) * 1994-09-30 1996-10-22 Dahl; Ernest A. Fire detector
JPH1123458A (en) * 1997-05-08 1999-01-29 Nittan Co Ltd Smoke sensor and monitoring control system
DE19902319B4 (en) * 1999-01-21 2011-06-30 Novar GmbH, Albstadt-Ebingen Zweigniederlassung Neuss, 41469 Scattered light fire detectors
DE19912911C2 (en) * 1999-03-22 2001-07-19 Schako Metallwarenfabrik Device for detecting smoke
DE19951403B4 (en) * 1999-10-26 2010-01-07 Schako Metallwarenfabrik Ferdinand Schad Kg Zweigniederlassung Kolbingen Method for detecting smoke
DE10046992C1 (en) * 2000-09-22 2002-06-06 Bosch Gmbh Robert Scattered light smoke
EP1349127A1 (en) * 2002-03-28 2003-10-01 Siemens Building Technologies AG Obscuration smoke detector and use thereof
DE102004001699A1 (en) * 2004-01-13 2005-08-04 Robert Bosch Gmbh fire alarm
DE102004002591B4 (en) * 2004-01-16 2016-03-03 Robert Bosch Gmbh fire alarm

Also Published As

Publication number Publication date
US20080252468A1 (en) 2008-10-16
EP1783713A1 (en) 2007-05-09
DE502005004298D1 (en) 2008-07-10
ES2306026T3 (en) 2008-11-01
US7812708B2 (en) 2010-10-12
WO2007051819A1 (en) 2007-05-10
CN101300612A (en) 2008-11-05
CN101300612B (en) 2010-11-03
ATE397261T1 (en) 2008-06-15

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