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EP0707207B1 - Smoke detector - Google Patents

Smoke detector Download PDF

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Publication number
EP0707207B1
EP0707207B1 EP95113253A EP95113253A EP0707207B1 EP 0707207 B1 EP0707207 B1 EP 0707207B1 EP 95113253 A EP95113253 A EP 95113253A EP 95113253 A EP95113253 A EP 95113253A EP 0707207 B1 EP0707207 B1 EP 0707207B1
Authority
EP
European Patent Office
Prior art keywords
smoke detector
detection chamber
smoke
signal processing
housing
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
EP95113253A
Other languages
German (de)
French (fr)
Other versions
EP0707207A3 (en
EP0707207A2 (en
Inventor
Reiner Künzel
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.)
Novar GmbH
Original Assignee
Novar GmbH
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 Novar GmbH filed Critical Novar GmbH
Publication of EP0707207A2 publication Critical patent/EP0707207A2/en
Publication of EP0707207A3 publication Critical patent/EP0707207A3/en
Application granted granted Critical
Publication of EP0707207B1 publication Critical patent/EP0707207B1/en
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
    • 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
    • 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 detection chamber according to the invention has only a few cheap components. she Therefore, it can also be designed for use as a disposable insert.
  • the matching circuit in particular the electrical and / or photoelectric Tolerances of the smoke sensor and the mechanical tolerances of the optical system be matched to the detection chamber.
  • This adjustment can be advantageously in the factory respectively. It is preferably carried out such that the output signal of the electrical matching circuit is proportional to the smoke density. The same applies to an adjustment of the signal processing and alarm evaluation circuit.

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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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The smoke detector has a housing enclosing a detection chamber (2) which is provided by a replaceable insert, incorporating a smoke sensor (4,5) and an electrical adaption circuit (6). The electronic signal evaluation and alarm activation circuit (3) is contained within the smoke detector housing, with the adaption circuit coupled to it via an interface circuit for transfer of the smoke sensor signals. The housing pref. has a fixed upper part (1) and a removable lower part (9) between which the detection chamber insert is fitted, with the evaluation and alarm activation circuit contained in the lower part.

Description

Die Erfindung betrifft einen Rauchmelder, insbesondere einen optischen Rauchmelder, der nach dem Prinzip der Streulichtmessung (Tyndall-Effekt) arbeitet.The invention relates to a smoke detector, in particular an optical smoke detector based on the principle of Scattered light measurement (Tyndall effect) works.

Optische Rauchmelder haben den Vorteil eines sehr schnellen Ansprechens bei Kunststoffschwelbränden, offenen Bränden sowie Bränden von Flüssigkeiten mit Rauchentwicklung.Optical smoke detectors have the advantage of a very fast Response to plastic smoldering fires, open fires as well as fires of liquids with smoke.

Bei einem bekannten optischen Rauchmelder sind in einer Meßkammer eine Leuchtdiode und ein Fotoelement so angeordnet, daß das von der Leuchtdiode ausgesandte Licht nicht direkt zum Fotoelement gelangen kann. Darüber hinaus ist die Meßkammer als Labyrinth oder "optischer Sumpf" ausgebildet, in dem eventuell eindringendes Fremdlicht absorbiert wird.In a known optical smoke detector are in one Measuring chamber arranged a light emitting diode and a photoelement so that the light emitted by the light emitting diode is not can get directly to the photo element. In addition, it is the measuring chamber is designed as a labyrinth or "optical sump", absorbed in the possibly penetrating extraneous light becomes.

In die Meßkammer eindringende Rauchpartikel streuen und reflektieren den von der Leuchtdiode ausgesandten Meßlichtstrahl. Das gestreute oder reflektierte Licht wird vom Fotoelement erfaßt, in ein Spannungssignal umgewandelt und in einer nachgeschalteten elektronischen Schaltung ausgewertet, die gegebenenfalls einen Alarm auslöst.Scatter into the measuring chamber penetrating smoke particles and reflect the measuring light beam emitted by the LED. The scattered or reflected light is from the photo element detected, converted into a voltage signal and in a downstream electronic circuit evaluated, which triggers an alarm if necessary.

Die Rauchmelder unterliegen im Betrieb den üblichen Umweltbedingungen wie Schmutz, Staub, Rauch usw.. Daher muß insbesondere die sensible Meßkammer turnusgemäß überprüft und gegebenenfalls gereinigt werden, damit die geforderte Ansprechempfindlichkeit gewährleistet bleibt. The smoke detectors are subject to normal environmental conditions during operation such as dirt, dust, smoke, etc. Therefore, in particular the sensitive measuring chamber checked regularly and be cleaned if necessary, so that the required sensitivity remains guaranteed.

Bisher erfolgt die Reinigung der Messkammer beim Hersteller des Rauchmelders. Dazu muss der Rauchmelder "gepflückt" und durch einen neuen ersetzt werden. Der gepflückte Rauchmelder wird dann an den Hersteller zur Reinigung geschickt. Diese Vorgehensweise ist recht umständlich und bedingt einen erheblichen zeitlichen und finanziellen Aufwand.So far, the cleaning of the measuring chamber is done by the manufacturer of the smoke detector. This must be the Smoke detector "picked" and replaced by a new one. The picked smoke detector will be sent to the manufacturer for cleaning. This procedure is quite cumbersome and requires a considerable amount of time and money.

Die DE-AS 2 130 889 offenbart einen Rauchmelder, der zwei unabhängig lösbare Teile enthält, wobei das erste Teil eine elektronische Signalverarbeitungs- und Alarmauswertungsschaltung enthält und das zweite Teil eine wartungsanfällige Detektionskammer enthält. Beim Warten dieser Wartungskammer braucht das erste Teil mit der empfindlichen Signalverarbeitungs- und Alarmauswertungsschaltung nicht entnommen zu werden.DE-AS 2 130 889 discloses a smoke detector which contains two independently detachable parts, the first part being an electronic signal processing and alarm evaluation circuit contains and the second part contains a maintenance-prone detection chamber. While waiting for this Maintenance chamber needs the first part with the sensitive signal processing and alarm evaluation circuit not to be removed.

Die Druckschriften DE 26 52 970; EP 0 399 244 A2; FR 2 524 179; DE-OS 2 250 820; EP 0 349 403 A2; US-4,672,217 und DE-OS 2 205 797 zeigen allesamt Rauchmelder, welche mindestens zweiteilig aufgebaut sind, und bei denen die wartungsanfällige Detektionskammer bei Wartungsarbeiten vor Ort vom Rauchmelder entnommen werden kann, ohne dass die (empfindliche) elektronische Signalverarbeitungs- und Alarmauswertungsschaltung vom Rauchmelder getrennt wird.The documents DE 26 52 970; EP 0 399 244 A2; FR 2 524 179; DE-OS 2 250 820; EP 0 349 403 A2; US-4,672,217 and DE-OS 2,205,797 all show smoke detectors, which at least are constructed in two parts, and where the maintenance-prone detection chamber during maintenance Can be taken on site from the smoke detector without the (sensitive) electronic signal processing and alarm evaluation circuit separated from the smoke detector becomes.

Bei den oben beschriebenen Rauchmeldern kann allerdings nicht sichergestellt werden, dass die geforderte Ansprechempfindlichkeit des Rauchmelders bei Rauchaerosolen auch bei einem beliebigen Tausch und Zuordnung von Detektionskammer und elektronischer Signalverarbeitungs- und Alarmauswertungsschaltung eingehalten wird.In the case of the smoke detectors described above, however, it can not be ensured that the demanded responsiveness of the smoke detector in smoke aerosols also at any Exchange and assignment of detection chamber and electronic signal processing and Alarm evaluation circuit is maintained.

Es ist daher Aufgabe der vorliegenden Erfindung, einen Rauchmelder anzugeben, bei welchem sichergestellt wird, dass jede Detektionskammer mit jeder elektronischen Signalverarbeitungs- und Alarmauswertungsschaltung kompatibel ist.It is therefore an object of the present invention to provide a Indicate smoke detector, in which it is ensured that each detection chamber with each electronic signal processing and alarm evaluation circuit is compatible.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß durch einen Rauchmelder mit den im Anspruch 1 angegebenen Merkmalen.The solution of this object is achieved by a smoke detector with the in claim 1 specified characteristics.

Somit weist die erfindungsgemäße Detektionskammer nur wenige billige Bauelemente auf. Sie kann daher auch zur Verwendung als Einwegeinsatz ausgelegt sein.Thus, the detection chamber according to the invention has only a few cheap components. she Therefore, it can also be designed for use as a disposable insert.

Ferner lässt sich durch die Anpassungsschaltung sicherstellen, dass jede Detektionskammer mit jeder Signalverarbeitungs- und Alarmauswertungsschaltung kompatibel ist, d.h. beispielsweise die Signalausgänge der Detektionskammern und die Signaleingänge der Signalverarbeitungs- und Alarmauswertungsschaltungen vorbestimmte Spezifikationen erfüllen. Dadurch wird sichergestellt, dass die geforderte Ansprechempfindlichkeit des Rauchmelders bei Rauchaerosolen auch bei einem beliebigen Tausch und Zuordnung von Detektionskammer und Signalverarbeitungs- und Alarmauswertungsschaltung eingehalten wird.Furthermore, it can be ensured by the matching circuit that each detection chamber with each signal processing and alarm evaluation circuit is compatible, i. for example the Signal outputs of the detection chambers and the signal inputs of the signal processing and Alarm evaluation circuits meet predetermined specifications. This will ensure that the required responsiveness of the smoke detector in smoke aerosols also at any exchange and assignment of detection chamber and signal processing and Alarm evaluation circuit is maintained.

Durch die Anpassungsschaltung können insbesondere die elektrischen und/oder photoelektrischen Toleranzen des Rauchsensors sowie die mechanischen Toleranzen des optischen Systems der Detektionskammer abgeglichen werden. Dieser Abgleich kann vorteilhafterweise im Werk erfolgen. Er wird vorzugsweise so durchgeführt, dass das Ausgangssignal der elektrischen Anpassungsschaltung proportional zur Rauchdichte ist. Entsprechendes gilt für eine Justage der Signalverarbeitungs- und Alarmauswertungsschaltung. Through the matching circuit, in particular the electrical and / or photoelectric Tolerances of the smoke sensor and the mechanical tolerances of the optical system be matched to the detection chamber. This adjustment can be advantageously in the factory respectively. It is preferably carried out such that the output signal of the electrical matching circuit is proportional to the smoke density. The same applies to an adjustment of the signal processing and alarm evaluation circuit.

Die Anpassungsschaltung und die Signalverarbeitungs- und Alarmauswertungsschaltung sind vorteilhafterweise durch eine Schnittstelle miteinander verbindbar, über die Signale übertragen werden können. Vorzugsweise enthält die Schnittstelle einen elektrischen Steckverbinder.The matching circuit and the signal processing and alarm evaluation circuit are advantageously connectable to each other by an interface, transmitted via the signals can be. Preferably, the interface includes an electrical connector.

Auf diese Weise lässt sich die Detektionskammer besonders einfach auswechseln.In this way, the detection chamber is particularly easy to replace.

Als Rauchsensor enthält die Detektionskammer vorzugsweise ein lichtemittierendes Element, beispielsweise eine Leuchtdiode, und ein lichtempfindliches Element, beispielsweise ein Fotoelement. As a smoke sensor, the detection chamber preferably contains a light-emitting element, For example, a light emitting diode, and a photosensitive element, such as a photoelement.

Bei dieser Ausführungsform kann in einfacher Weise das Gehäuse geöffnet werden, um die Detektionskammer zu überprüfen bzw. auszutauschen. Außerdem ist auf diese Weise auch die Signalverarbeitungs- und Alarmauswertungsschaltung leicht zugänglich.In this embodiment, the housing can be easily opened to check the detection chamber or exchange. Besides, this is also true the signal processing and alarm evaluation circuit easily accessible.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert, das in den Figuren dargestellt ist. Es zeigt:

Fig. 1
einen zerlegten, erfindungsgemäßen Rauchmelder
Fig. 2
schematisch ein elektrisches Blockschaltbild für einen erfindungsgemäßen Rauchmelder.
The invention will be explained in more detail with reference to an embodiment which is shown in the figures. It shows:
Fig. 1
a disassembled, smoke detector according to the invention
Fig. 2
schematically an electrical block diagram for a smoke detector according to the invention.

Gemäß Fig. 1 weist der Rauchmelder ein Gehäuseoberteil 1, eine Detektionskammer 2 und ein Gehäuseunterteil 9 auf. Das Gehäuseoberteil 1 weist einen oberen Abschnitt, in den die Detektionskammer 2 hineinpaßt, und einen unteren Abschnitt auf, in dem das Gehäuseunterteil 9 versenkt befestigbar ist. Im oberen Abschnitt weist das Gehäuseobertei 1 mehrere Öffnungen 10 auf, durch die Rauch ins Gehäuseinnere und somit in die Detektionskammer 2 gelangen kann.1, the smoke detector has an upper housing part 1, a detection chamber 2 and a housing lower part 9. The upper housing part 1 has an upper portion into which the detection chamber 2 fits, and a lower portion on, in which the lower housing part 9 sunk fastened is. In the upper section, the housing top shows 1 several openings 10, through the smoke into the housing interior and thus can get into the detection chamber 2.

Die Detektionskammer 2 ist im Prinzip genauso aufgebaut wie beim eingangs genannten Stand der Technik, d.h. enthält eine Leuchtdiode 4 als lichtemittierendes Element, ein Fotoelement 5 als lichtempfindliches Element und ein Labyrinth 7 als optischen Sumpf. Zusätzlich weist die Detektionskammer 2 an ihrer Unterseite eine Platine mit einer elektrischen Anpassungsschaltung 6 auf. Auf dieser Platine ist auch die eine Hälfte eines elektrischen Steckverbinders 8 angebracht. The detection chamber 2 is basically the same as in the aforementioned prior art, i. contains a light emitting diode 4 as a light emitting element, a photoelement 5 as a photosensitive element and a labyrinth 7 as optical sump. In addition, the detection chamber 2 on its underside a board with a electrical matching circuit 6. On this board is also one half of an electrical connector 8 attached.

Im Gehäuseunterteil 9 ist eine weitere Platine mit einer elektronischen Signalverarbeitungs- und Alarmauswertungsschaltung 3 angebracht. Auf dieser weiteren Platine ist die andere Hälfte des elektrischen Steckverbinders 8 befestigt.In the lower housing part 9 is another board with a electronic signal processing and alarm evaluation circuit 3 attached. On this further board is the other half of the electrical connector 8 attached.

Die Detektionskammer 2 ist als leicht auswechselbarer Einsatz ausgebildet und weist dazu an ihrer Oberseite einen Schnappmechanismus 11 sowie eine Führungshülse 12 auf, mit deren Hilfe die Detektionskammer 2 in an sich bekannter Weise in entsprechenden Vertiefungen im Gehäuseoberteil 1 einhakbar bzw. zentrierbar ist. An ihrer Unterseite weist die Detektionskammer 2 Vertiefungen auf, in die Führungshülsen 13 des Gehäuseunterteils 9 in gleicher Weise eingreifen können.The detection chamber 2 is an easily replaceable insert formed and has one at its top Snap mechanism 11 and a guide sleeve 12, with whose help the detection chamber 2 in known per se Way in corresponding wells in the upper housing part. 1 can be hooked or centered. On its underside points the detection chamber 2 recesses, in the guide sleeves 13 of the lower housing part 9 engage in the same way can.

Bei einer bevorzugten Ausführung des Rauchmelders ist das Gehäuseunterteil 9 durch die Führungshülsen 12; 13 und die Detektionskammer 2 hindurch direkt mit dem Gehäuseoberteil 1 verschraubbar. Bei der Wartung des Rauchmelders läßt sich daher nach Lösen der Schrauben das Gehäuseunterteil 9 samt Detektionskammer 2 aus dem Gehäuseoberteil 1 herausnehmen. Falls die Detektionskammer 2 verschmutzt ist und ausgewechselt werden muß, wird sie vom Gehäuseunterteil 9 abgenommen. Danach wird eine neue Detektionskammer 2 auf das Gehäuseunterteil 9 aufgesteckt und beide Teile mit dem Gehäuseoberteil 1 verschraubt. Statt der Schraubverbindung können natürlich auch andere bekannte Verbindungstechniken, wie beispielsweise Schnappverschlüsse oder dergleichen vorgesehen sein.In a preferred embodiment of the smoke detector is Housing lower part 9 through the guide sleeves 12; 13 and the detection chamber 2 passes directly to the upper housing part 1 screwed. When maintaining the smoke detector leaves Therefore, after loosening the screws, the lower housing part. 9 remove the detection chamber 2 from the upper housing part 1. If the detection chamber 2 is dirty and must be replaced, it is from the lower housing part. 9 decreased. Thereafter, a new detection chamber 2 the lower housing part 9 attached and both parts with the Housing top 1 screwed. Instead of the screw connection Of course, other known joining techniques, such as snap closures or the like provided be.

Wie in Fig. 2 schematisch dargestellt, ist die Leuchtdiode 4 und das Fotoelement 5 mit der elektrischen Anpassungsschaltung 6 verbunden. Die elektrische Anpassungsschaltung 6 und die Signalverarbeitungs- und Alarmauswertungsschaltung 3 sind mit einer Schnittstelle 14 ausgerüstet, die vorzugsweise einen elektrischen Steckverbinder enthält. Die Signalverarbeitungs- und Alarmauswertungsschaltung 3 weist ferner einen Alarmausgang und einen Störungsausgang auf, durch den ein Alarm ausgelöst bzw. eine Störungsanzeige bewirkt werden kann.As shown schematically in Fig. 2, the light emitting diode 4 and the photoelement 5 with the electrical matching circuit 6 connected. The electrical matching circuit 6 and the signal processing and alarm evaluation circuit 3 are equipped with an interface 14, the preferably includes an electrical connector. The signal processing and alarm evaluation circuit 3 also has an alarm output and a fault output through which an alarm is triggered or a fault indication can be effected.

Bei einer anderen Ausführung erfolgt die Signalübertragung zwischen der Anpassungsschaltung 6 und der Signalverarbeitungs- und Alarmauswertungsschaltung 3 sowie die Stromversorgung für die Leuchtdiode 4, das Fotoelement 5 und die Anpassungsschaltung 6 auf induktivem Weg.In another embodiment, the signal transmission takes place between the matching circuit 6 and the signal processing and alarm evaluation circuit 3 and the power supply for the light emitting diode 4, the photo element 5 and the Matching circuit 6 by inductive means.

Claims (7)

  1. A smoke detector, especially an optical smoke detector, with a housing comprising a housing upper part (1) and a housing bottom part (9), a detection chamber (2) which is situated in the housing and comprises a smoke sensor (4, 5), with the detection chamber (2) being configured as an exchangeable insert, and an electronic signal processing and alarm evaluation circuit (3) arranged in the housing, characterized in that the electronic signal processing and alarm evaluation circuit (3) is attached to the bottom part (9) of the housing and the detection chamber (2) comprises an electric interface circuit (6) which ensures that each detection chamber (2) is compatible with each electronic signal processing and alarm evaluation circuit (3).
  2. A smoke detector according to claim 1, characterized in that the electric interface circuit (6) and the electronic signal processing and alarm evaluation circuit (3) can be connected by an interface through which the signals can be transferred.
  3. A smoke detector according to claim 2, characterized in that the interface comprises an electric plug-in connector.
  4. A smoke detector according to one of the preceding claims, characterized in that the detection chamber (2) comprises a light-emitting element (4) and a light-sensitive element (5) as the smoke sensor.
  5. A smoke detector according to one of the preceding claims, characterized in that the electric interface circuit (6) ensures that signal outputs of the detection chamber (2) and signal outputs of the electronic signal processing and alarm evaluation circuit (3) fulfil predetermined specifications.
  6. A smoke detector according to one of the preceding claims, characterized in that the electric interface circuit (6) is arranged in such a way that electric and/or photo-electric tolerances of the smoke sensor (4, 5) are adjustable.
  7. A smoke detector according to one of the preceding claims, characterized in that the electric interface circuit (6) is arranged in such a way that mechanical tolerances of an optical system of the detection chamber (2) are adjustable.
EP95113253A 1994-10-10 1995-08-23 Smoke detector Expired - Lifetime EP0707207B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9416314U DE9416314U1 (en) 1994-10-10 1994-10-10 smoke detector
DE9416314U 1994-10-10

Publications (3)

Publication Number Publication Date
EP0707207A2 EP0707207A2 (en) 1996-04-17
EP0707207A3 EP0707207A3 (en) 1998-05-13
EP0707207B1 true EP0707207B1 (en) 2005-02-09

Family

ID=6914712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113253A Expired - Lifetime EP0707207B1 (en) 1994-10-10 1995-08-23 Smoke detector

Country Status (4)

Country Link
EP (1) EP0707207B1 (en)
CN (1) CN1133461A (en)
AT (1) ATE289062T1 (en)
DE (2) DE9416314U1 (en)

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FR2813428B1 (en) * 2000-08-25 2002-12-13 Arana Juan Carlos Ceron DEVICE FOR THE PROTECTION, INSTALLATION AND MAINTENANCE OF SURVEILLANCE CAMERAS IN PUBLIC TRANSPORT
TWI235965B (en) * 2001-04-24 2005-07-11 Matsushita Electric Works Ltd Fire detector unit
DE10135762A1 (en) * 2001-07-23 2003-02-13 Luxmate Controls Gmbh Dornbirn Room sensor with mounting adapter
DK1376505T3 (en) * 2002-06-20 2006-06-19 Siemens Schweiz Ag fire Detector
ES2451915R1 (en) 2012-09-27 2014-06-02 Utc Fire & Security Americas Corporation, Inc. MODULAR SMOKE DETECTION SYSTEM AND PROCEDURE FOR MOUNTING A SMOKE DETECTION SYSTEM
CN107195160A (en) * 2017-06-21 2017-09-22 深圳市泰和安科技有限公司 Smoke detector and its installation detection method
ES2977482T3 (en) 2018-05-09 2024-08-26 Carrier Corp Smoke chamber for multi-angle multi-wave smoke detector
DE102018125494A1 (en) * 2018-10-15 2020-04-16 Bombardier Transportation Gmbh Smoke detector for detecting smoke in sections, and vehicle having a smoke detector

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DE2130889A1 (en) * 1970-07-23 1972-02-03 Cerberus Ag Ionization fire alarms
DE2205797A1 (en) * 1971-02-09 1972-08-24 Langeron R Automatic monitoring device
DE2250820A1 (en) * 1971-10-20 1973-04-26 Securitas Ab Bevaknings MEASURING OR INDICATOR FOR SMOKE OD. DGL
DE2652970A1 (en) * 1976-11-22 1978-05-24 Hartwig Ing Grad Beyersdorf IONIZATION FIRE DETECTOR
FR2524179A2 (en) * 1977-04-08 1983-09-30 Hugon Emile Smoke detector using ionisation chamber - where detector is assembled from inexpensive, interchangeable polymer mouldings and uses electronic velocimeter circuit
US4672217A (en) * 1985-04-05 1987-06-09 General Signal Corporation Easily cleaned photoelectric smoke detector
EP0349403A2 (en) * 1988-06-30 1990-01-03 Emile Hugon Smoke detector with an integrated address circuit

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US3980997A (en) * 1974-07-17 1976-09-14 General Signal Corporation Smoke detector
US4249082A (en) * 1977-09-20 1981-02-03 Cybernet Electronics Corporation Photoelectric smoke sensor box
CH621640A5 (en) * 1977-11-21 1981-02-13 Cerberus Ag
US4906978A (en) * 1986-12-24 1990-03-06 Cerberus Ag Optical smoke detector
US5021677A (en) 1989-05-02 1991-06-04 Nohmi Bosai Kabushiki Kaisha Light-scattering-type smoke detector
WO1993008461A1 (en) * 1991-10-14 1993-04-29 I.E.I. Pty. Ltd. Improvements relating to a sampling chamber for a pollution detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2130889A1 (en) * 1970-07-23 1972-02-03 Cerberus Ag Ionization fire alarms
DE2205797A1 (en) * 1971-02-09 1972-08-24 Langeron R Automatic monitoring device
DE2250820A1 (en) * 1971-10-20 1973-04-26 Securitas Ab Bevaknings MEASURING OR INDICATOR FOR SMOKE OD. DGL
DE2652970A1 (en) * 1976-11-22 1978-05-24 Hartwig Ing Grad Beyersdorf IONIZATION FIRE DETECTOR
FR2524179A2 (en) * 1977-04-08 1983-09-30 Hugon Emile Smoke detector using ionisation chamber - where detector is assembled from inexpensive, interchangeable polymer mouldings and uses electronic velocimeter circuit
US4672217A (en) * 1985-04-05 1987-06-09 General Signal Corporation Easily cleaned photoelectric smoke detector
EP0349403A2 (en) * 1988-06-30 1990-01-03 Emile Hugon Smoke detector with an integrated address circuit

Also Published As

Publication number Publication date
EP0707207A3 (en) 1998-05-13
DE59510989D1 (en) 2005-03-17
ATE289062T1 (en) 2005-02-15
EP0707207A2 (en) 1996-04-17
CN1133461A (en) 1996-10-16
DE9416314U1 (en) 1994-12-01

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