EP0079011A1 - Smoke detector - Google Patents

Smoke detector Download PDF

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Publication number
EP0079011A1
EP0079011A1 EP82110014A EP82110014A EP0079011A1 EP 0079011 A1 EP0079011 A1 EP 0079011A1 EP 82110014 A EP82110014 A EP 82110014A EP 82110014 A EP82110014 A EP 82110014A EP 0079011 A1 EP0079011 A1 EP 0079011A1
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EP
European Patent Office
Prior art keywords
radiation
smoke detector
detector according
diaphragm
solid angle
Prior art date
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Granted
Application number
EP82110014A
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German (de)
French (fr)
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EP0079011B1 (en
Inventor
Jürg Dr. sc. nat. Dipl.-Phys. Muggli
Peter Gruber
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Cerberus AG
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Cerberus AG
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Priority to AT82110014T priority Critical patent/ATE17061T1/en
Publication of EP0079011A1 publication Critical patent/EP0079011A1/en
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Publication of EP0079011B1 publication Critical patent/EP0079011B1/en
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    • 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 invention relates to a smoke detector with a radiation source which emits radiation in a specific spatial area and at least one radiation receiver which is arranged outside the direct radiation area and to which radiation scattered on particles in the radiation area is supplied.
  • Such a smoke detector is known for example from CH-PS 592 932. It contains an evaluation circuit which triggers an alarm when a predetermined signal level of the received scattered light is reached. The smoke concentration at which the alarm is triggered is fixed.
  • the invention has for its object to provide a smoke detector which has the disadvantages of the known smoke Detector does not have and in particular to create an optical smoke detector, the sensitivity of which can be changed in a defined manner by purely mechanical changes to optical parts.
  • the radiation source emits light in a conical shape.
  • the receiver is located outside the direct radiation area in the cone axis.
  • the outer aperture of the receiver is moved along the cone axis towards the transmitter. This reduces the stray volume viewed by the receiver, which means that a larger smoke density is required to generate the specified signal at the receiver.
  • the amount of radiation scattered by the smoke onto the radiation receiver 16 is smaller or larger. It has been shown that a shift of the diaphragm 3 by a few millimeters is sufficient; to make the detector less sensitive by a factor of two.
  • the above-described configuration of the smoke detector according to the invention mechanically changes the solid angle visible by the radiation receiver.
  • the aperture 3 it is readily possible to mount a corresponding aperture, not shown in the figure, in such a way that the solid angle irradiated by the radiation source 1 is changed mechanically, for example below the central aperture 18 in the vicinity of the radiation source 1.
  • Fig. 2 a possible form for actuating the cam 4 is shown in supervision.
  • the cam disk 4 can be rotated through an elongated hole 5 in the cover 10.
  • the small recess 11 can be pushed from one stop to another, for example. So that the height of the diaphragm 3 is more precisely defined in both positions, the groove 7 can Cam 4 instead of a uniformly rising shape have a horizontal part at each of the two end stops.
  • Another possibility of the mechanical adjustment consists in a variable covering of the reference cell 12.
  • the proportion of the received light from the radiation source 1 becomes smaller.
  • this is controlled for a stronger transmission power, as a result of which the radiation scattered on the smoke, which is received by the radiation receiver 16, becomes larger.
  • This makes the smoke detector more sensitive.
  • This can be done, for example, by changing the opening 8 in the diaphragm 3.
  • This change can take place through inserts into the opening 8, which change the cross section of the opening 8 or through a ring which can be rotated about the axis of the smoke detector and which contains openings of different cross sections.
  • the opening 8 so ge be designed that a shift of the diaphragm 3 simultaneously causes a change in the cross section of the beam falling through the opening 8 onto the reference cell 12.

Abstract

A smoke detector is disclosed containing a radiation source and a radiation receiver arranged externally of a direct radiation region of the radiation source. In the presence of smoke or other combustion particles in the radiation region the radiation receiver is impinged by scattered radiation. The smoke detector contains optical elements which can be altered by external mechanical actuation, by means of which it is possible to alter in a predetermined manner an output signal of the radiation receiver. In this regard it is possible to either mechanically alter the solid angle which is so-to-speak viewed by the radiation receiver or the solid angle irradiated by the radiation source. The constriction of the active solid angle is preferably accomplished by a diaphragm or membrane displaceable along the radiation direction. Displacement of the diagram is preferably achieved in that, this diaphragm engages by means of dogs or detents in a cam groove, such as a helical-shaped groove of a cam disk, and by rotating the cam disk there can be achieved a defined displacement of the diaphragm.

Description

Die Erfindung betrifft einen Rauchdetektor mit einer Strahlungsquelle, welche Strahlung in einen bestimmten Raumbereich aussendet und mindestens einem Strahlungsempfänger, der ausserhalb des direkten Strahlungsbereichs angeordnet ist und dem an Partikeln im Strahlungsbereich gestreute Strahlung zugeführt wird.The invention relates to a smoke detector with a radiation source which emits radiation in a specific spatial area and at least one radiation receiver which is arranged outside the direct radiation area and to which radiation scattered on particles in the radiation area is supplied.

Ein solcher Rauchdetektor ist beispielsweise aus der CH-PS 592 932 bekannt. Er enthält eine Auswerteschaltung, welche bei Erreichen eines vorbestimmten Signalpegels des empfangenen Streulichts Alarm auslöst. Die Rauchkonzentration, bei welcher Alarm ausgelöst wird, ist fest eingestellt.Such a smoke detector is known for example from CH-PS 592 932. It contains an evaluation circuit which triggers an alarm when a predetermined signal level of the received scattered light is reached. The smoke concentration at which the alarm is triggered is fixed.

Um den Rauchdetektor unterschiedlichen Umgebungsbedinguncen anpassen zu können, ist es erforderlich, eine Empfindlichkeitseinstellung vornehmen zu können. Dies kann beispielsweise durch Veränderung der Alarmschwelle erreicht werden. Es ist aber häufig vorteilhaft, die einzelnen Melder individuell einstellen zu können. Für Ionisationsrauchmelder wurde in der CH-PS 468 683 eine elektrische Schaltungsanordnung zur Empfindlichkeitsveränderung vorgeschlagen, bei welcher die Einstellung der Ansprechschwelle eines als Verstärker und Schwellenwertdetektor dienenden Feldeffektransistors mittel eines Potentiometers erfolgt, der Teil eines Spannungsteilers ist,mit dem die Source-Elektrode vorgespannt wird. Auch wenn die Einstellung nicht kontinuierlich mit einem Potentiometer vorgenommen wird, sondern mittels eines Schalters, mit dem Festwiderstände unterschiedlicher Grösse in den Stromkreis geschaltet werden, sind solche elektrischen Einstellmöglichkeiten störanfällig und nicht korrosionsfest.In order to be able to adapt the smoke detector to different environmental conditions, it is necessary to be able to make a sensitivity setting. This can be achieved, for example, by changing the alarm threshold. However, it is often advantageous to be able to set the individual detectors individually. For ionization smoke detectors, an electrical circuit arrangement for changing the sensitivity was proposed in CH-PS 468 683, in which the setting of the response threshold of a field-effect transistor serving as an amplifier and threshold value detector takes place by means of a potentiometer, which is part of a voltage divider with which the source electrode is biased. Even if the setting is not carried out continuously with a potentiometer, but rather by means of a switch with which fixed resistors of different sizes are switched into the circuit, such electrical setting options are prone to failure and are not corrosion-resistant.

Der Erfindung liegt die Aufgabe zu Grunde, einen Rauchdetektor zu schaffen, der die erwähnten Nachteile der bekannten Rauchmelder nicht aufweist und insbesondere einen optischen Rauchdetektor zu schaffen, dessen Empfindlickeit durch rein mechanische Veränderung optischer Teile definiert verändert werden kann.The invention has for its object to provide a smoke detector which has the disadvantages of the known smoke Detector does not have and in particular to create an optical smoke detector, the sensitivity of which can be changed in a defined manner by purely mechanical changes to optical parts.

Diese Aufgabe wird erfindungsgemäss durch die im kennzeichnenden Teil des Patentanspruches 1 definierte Merkmale gelöst. Bevorzugte Ausführungsformen und weitere Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen definiert.According to the invention, this object is achieved by the features defined in the characterizing part of patent claim 1. Preferred embodiments and further refinements of the invention are defined in the dependent claims.

Gemäss einer bevorzugten Ausführungsform des erfindungsgemässen Rauchdetektors sendet die Strahlungsquelle hohlkegelförmig Licht aus. Der Empfänger ist ausserhalb des direkten Strahlungsbereichs in der Kegelachse angeordnet. Die äussere Blende des Empfängers wird längs der Kegelachse in Richtung Sender verschoben. Dadurch verringert sich das vom Empfänger eingesehene Streuvolumen, wodurch eine grössere Rauchdichte benötigt wird, um das vorgegebene Signal am Empfänger zu erzeugen.According to a preferred embodiment of the smoke detector according to the invention, the radiation source emits light in a conical shape. The receiver is located outside the direct radiation area in the cone axis. The outer aperture of the receiver is moved along the cone axis towards the transmitter. This reduces the stray volume viewed by the receiver, which means that a larger smoke density is required to generate the specified signal at the receiver.

Die Erfindung wird im folgenden an Hand der Zeichnungen beispielshalber erläutert. Es zeigen:

  • Fig. 1 den Aufbau einer Ausführungsform eines Rauchdetektors in Seitenansicht teilweise geschnitten.
  • Fig. 2 die Verstelleinrichtung in Draufsicht.
  • Fig. 3 eine Aüsführungsform der Verstelleinrichtung in Seitenansicht.
The invention is explained below by way of example with reference to the drawings. Show it:
  • Fig. 1 shows the structure of an embodiment of a smoke detector partially cut in side view.
  • Fig. 2, the adjustment device in plan view.
  • F ig. 3 shows an embodiment of the adjusting device in a side view.

Im Rauchdetektor gemäss Fig. l liegt die Strahlungsquelle 1, z.B. ein IR-Strahlung aussendendes Halbleiterelement, im unteren Teil des Melders. Die IR-Strahlung wird durch die Optik 17 hohlkegelförmig gebündelt. Die Zentralblende 19 hält die direkte Strahlung vom Strahlungsempfänger 16 fern. Die Referenzzelle 12 misst und regelt die von der Strahlungsquelle 1 ausgesandte Strahlung. Die Blende 3 begrenzt das durch Rauch auf den Empfänger gestreute Licht. Die Blende 3 greift über einen Nocken 6 in eine in der Kurvenscheibe 4 befindliche, schraubenförmige Nut 7 ein. Durch Drehen der Kurvenscheibe 4 verschiebt sich die Blende 3 durch den Eingriff der Nocken 6 in die Nut 7 in Richtung der Achse auf- oder abwärts. Je nach der Lage der Kurvenscheibe 4 und damit zwangsläufig der Lage der Blende 3, ist die vom Rauch auf den Strahlungsempfänger 16 gestreute Strahlungsmenge kleiner oder grösser. Es hat sich gezeigt, dass eine Verschiebung der Blende 3 um einige Millimeter nach unten genügt; um den Melder um einen Faktor zwei unempfindlicher zu machen.In the smoke detector according to FIG. 1, the radiation source 1, for example a semiconductor element emitting IR radiation, is located in the lower part of the detector. The IR radiation is bundled in a hollow cone by the optics 17. The central aperture 19 keeps the direct radiation away from the radiation receiver 16. The reference cell 12 measures and regulates the radiation emitted by the radiation source 1. The aperture 3 limits this by smoke light scattered on the receiver. The diaphragm 3 engages via a cam 6 in a helical groove 7 located in the cam plate 4. By turning the cam plate 4, the diaphragm 3 moves up or down in the direction of the axis due to the engagement of the cams 6 in the groove 7. Depending on the position of the cam plate 4 and thus inevitably the position of the diaphragm 3, the amount of radiation scattered by the smoke onto the radiation receiver 16 is smaller or larger. It has been shown that a shift of the diaphragm 3 by a few millimeters is sufficient; to make the detector less sensitive by a factor of two.

Wichtig ist dabei, dass die Blende 3 bei ihrer Bewegung den Strahlengang von der Strahlungsquelle 1 zur Referenzzelle 16 nicht stört. Daher ist in der Blende 3 eine Oeffnung 8 angebracht, die so bemessen ist, dass bei jeder Stellung der Blende 3 ein ungehinderter Strahlungsdurchtritt erfolgen kann. Diese Oeffnung kann jedoch auch zur mechanischen Empfindlichkeitsver- änderung des Rauchdetektors benutzt werden, wie weiter unten beschrieben wird.It is important that the aperture 3 does not disturb the beam path from the radiation source 1 to the reference cell 16 during its movement. Therefore, an opening 8 is provided in the diaphragm 3, which is dimensioned such that an unimpeded radiation passage can take place in each position of the diaphragm 3. However, this opening can also be used to change the mechanical sensitivity of the smoke detector, as will be described below.

Durch die vorstehend beschriebene Ausgestaltung des erfindungsgemässen Rauchdetektors wird der vom Strahlungsempfänger einsehbare Raumwinkel mechanisch verändert. Es ist jedoch ohne weiteres möglich, an Stelle der Blende 3 eine entsprechende, in der Figur nicht dargestellte Blende so anzubringen, dass der von der Strahlungsquelle 1 bestrahlte Raumwinkel mechanisch verändert wird, beispielsweise unterhalb der Zentralblende 18 in der Nähe der Strahlungsquelle l.The above-described configuration of the smoke detector according to the invention mechanically changes the solid angle visible by the radiation receiver. However, instead of the aperture 3, it is readily possible to mount a corresponding aperture, not shown in the figure, in such a way that the solid angle irradiated by the radiation source 1 is changed mechanically, for example below the central aperture 18 in the vicinity of the radiation source 1.

In Fig. 2 ist in Aufsicht eine mögliche Form zur Betätigung der Kurvenscheibe 4 dargestellt. Durch ein längliches Loch 5 in der Abdeckung 10 lässt sich die Kurvenscheibe 4 drehen. Dabei kann die kleine Vertiefung 11 z.B. von einem Anschlag zum anderen geschoben werden. Damit die Höhe der Blende 3 in beiden Stellungen noch genauer definiert wird, kann die Nut 7 der Kurvenscheibe 4 statt einer gleichmässig steigenden Form an beiden Endanschlägen je einen waagrechten Teil besitzen.In Fig. 2 a possible form for actuating the cam 4 is shown in supervision. The cam disk 4 can be rotated through an elongated hole 5 in the cover 10. The small recess 11 can be pushed from one stop to another, for example. So that the height of the diaphragm 3 is more precisely defined in both positions, the groove 7 can Cam 4 instead of a uniformly rising shape have a horizontal part at each of the two end stops.

In Figur 4 ist eine bevorzugte Ausführungsform der Kurvenscheibe 4 dargestellt. Dabei weist die Nut 7 ausser an den Enden auch im mittleren Teil mindestens ein horizontales Teilstück auf. In diesem Fall ist auch mehr als eine kleine Vertiefung 11 vorhanden. Der Abstand der Vertiefungen 11 und die Länge des Lochs 5 sind in diesem Fall so aufeinander abgestimmt, dass die Verschiebung einer Vertiefung 11 von einem Ende des Lochs 5 zum anderen den Nocken 6 gerade bis zum nächsten horizontalen Teilstück gleiten lässt und dass gerade die nächste Vertiefung 11 am anderen Ende des Lochs erscheint. Wird diese zweite Vertiefung 11 zum anderen Ende des Lochs 5 verschoben, so gleitet der Nocken 11 genau bis zum nächsten horizontalen Teilstück, usw.A preferred embodiment of the cam disk 4 is shown in FIG. In addition to the ends, the groove 7 also has at least one horizontal section in the central part. In this case there is also more than one small depression 11. The distance between the depressions 11 and the length of the hole 5 are in this case coordinated with one another in such a way that the displacement of a depression 11 from one end of the hole 5 to the other causes the cam 6 to slide straight to the next horizontal section and that the next depression in particular 11 appears at the other end of the hole. If this second recess 11 is moved to the other end of the hole 5, the cam 11 slides exactly to the next horizontal section, etc.

Eine weitere Ausführungsform der erfindungsgemässen mechanischen Verstellvorrichtung besteht in einer - in den Figuren nicht dargestellten - Irisblende oder einem Blendenring, d.h. einer drehbaren Scheibe mit unterschielich grossen Oeffnungen, die sich zwischen Zentralblende 18 und Strahlungsquelle 1 oder Strahlungsempfänger 16 befinden.A further embodiment of the mechanical adjustment device according to the invention consists of an iris diaphragm or a diaphragm ring, not shown in the figures, i.e. a rotatable disc with different sized openings, which are located between the central aperture 18 and radiation source 1 or radiation receiver 16.

Eine andere Möglichkeit der mechanischen Verstellung besteht in einer variablen Abdeckung der Referenzzelle 12. Durch Abdecken der Referenzzelle 12 wird der Anteil des empfangenen Lichts von der Strahlungsquell 1 kleiner. Dadurch wird diese auf eine stärkere Sendeleistung gesteuert, wodurch die am Rauch gestreute Strahlung, die vom Strahlungsempfänger 16 aufgenommen wird, grösser wird. Der Rauchdetektor wird dadurch empfindlicher. Dies kann beispielsweise durch eine Veränderung der Oeffnung 8 in der Blende 3 erfolgen. Diese Veränderung kann durch Einsätze in die Oeffnung 8 erfolgen, welche den Querschnitt der Oeffnung 8 verändern oder durch einen um die Achse des Rauchdetektors drehbaren Ring, der Oeffnungen verschiedener Querschnitte enthält. Schliesslich kann die Oeffnung 8 so gestaltet sein, dass eine Verschiebung der Blende 3 gleichzeitig eine Veränderung des Querschnitts des durch die Oeffnung 8 auf die Referenzzelle 12 fallenden Strahlenbündels bewirkt.Another possibility of the mechanical adjustment consists in a variable covering of the reference cell 12. By covering the reference cell 12, the proportion of the received light from the radiation source 1 becomes smaller. As a result, this is controlled for a stronger transmission power, as a result of which the radiation scattered on the smoke, which is received by the radiation receiver 16, becomes larger. This makes the smoke detector more sensitive. This can be done, for example, by changing the opening 8 in the diaphragm 3. This change can take place through inserts into the opening 8, which change the cross section of the opening 8 or through a ring which can be rotated about the axis of the smoke detector and which contains openings of different cross sections. Finally, the opening 8 so ge be designed that a shift of the diaphragm 3 simultaneously causes a change in the cross section of the beam falling through the opening 8 onto the reference cell 12.

Claims (11)

1. Rauchdetektor mit einer Strahlungsquelle (1), einem ausserhalb des direkten Strahlungsbereiches der Strahlungsquelle (1) angeordneten, bei Anwesenheit von Rauch im Strahlungsbereich durch Streustrahlung beaufschlagten und ein Ausgangssignal abgebenden Strahlungsempfänger (16), dadurch gekennzeichnet, dass durch von aussen betätigbare mechanische Veränderung von optischen Elementen (3, 8) das Ausgangssignal des Strahlungsempfängers (16) in vorbestimmtem Masse verändert wird.1. Smoke detector with a radiation source (1), one located outside the direct radiation area of the radiation source (1), in the presence of smoke in the radiation area acted upon by scattered radiation and emitting an output signal emitting radiation receiver (16), characterized in that by externally operable mechanical change of optical elements (3, 8) the output signal of the radiation receiver (16) is changed to a predetermined extent. 2. Rauchdetektor gemäss Patentanspruch 1, dadurch gekennzeichnet, dass der vom Strahlungsempfänger (16) einsehbare Raumwinkel mechanisch verändert wird. 2nd Smoke detector according to claim 1, characterized in that the solid angle visible by the radiation receiver (16) is changed mechanically. 3. Rauchdetektor gemäss Patentanspruch 1, dadurch gekennzeichnet, dass der von der Strahlungsquelle (1) bestrahlte Raumwinkel mechanisch verändert wird. 3rd Smoke detector according to claim 1, characterized in that the solid angle irradiated by the radiation source (1) is changed mechanically. 4. Rauchdetektor gemäss einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, dass die Strahlungsquelle (1) so ausgebildet ist, dass sie hohlkegelförmig Licht aussendet und dass der Strahlungsempfänger (16) so ausgebildet ist, dass er auf der Kegelachse einen hohlkegelförmigen Raumwinkel einsieht. 4th Smoke detector according to one of Claims 1 to 3, characterized in that the radiation source (1) is designed such that it emits light in a conical shape and that the radiation receiver (16) is designed in such a way that it sees a conical solid angle on the cone axis. 5. Rauchdetektor gemäss einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, dass die Einengung des aktiven Raumwinkels durch eine längs der Strahlungsrichtung verschiebbare Blende (3) geschieht.5. Smoke detector according to one of the claims 1 to 4, characterized in that the narrowing of the active solid angle takes place by means of an aperture (3) which can be displaced along the radiation direction. 6. Rauchdetektor gemäss Patentanspruch 5, dadurch gekennzeichnet, dass die längs verschiebbare Blende (3) über Nocken (6) in eine schraubenförmige Nut (7) eingreift, welche sich auf der Kurvenscheibe (4) befindet, wobei durch Drehung der Kurvenscheibe (4) eine definierte Verschiebung der Blende (3) erfolgt. 6 . Smoke detector according to claim 5, characterized in that the longitudinally displaceable diaphragm (3) over Cam (6) engages in a helical groove (7) which is located on the cam disc (4), a defined displacement of the diaphragm (3) taking place by rotating the cam disc (4). 7. Rauchdetektor gemäss Patentanspruch 6, dadurch gekennzeichnet, dass die Nut (7) auf der Kurvenscheibe (4) mindestens zwei waagrechte Stücke enthält, welche eine definierte Einstellung der Blende (3) bewirken.7. Smoke detector according to claim 6, characterized in that the groove (7) on the cam disc (4) contains at least two horizontal pieces, which bring about a defined setting of the diaphragm (3). 8. Rauchdetektor gemäss Patentansprüchen 6 und 7, dadurch gekennzeichnet, dass die Kurvenscheibe (4) durch mindestens ein längliches Loch (5) in der Abdeckung betätigbar ist.8. Smoke detector according to claims 6 and 7, characterized in that the cam disc (4) can be actuated by at least one elongated hole (5) in the cover. 9. Rauchdetektor gemäss einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, dass zur Einengung des Raumwinkels eine Irisblende vorgesehen ist.9. Smoke detector according to one of the claims 1 to 4, characterized in that an iris diaphragm is provided to narrow the solid angle. 10. Rauchdetektor gemäss einem der Patentansprüche 1 und 4, dadurch gekennzeichnet, dass der Anteil des von einer Referenzzelle direkt vom Sender empfangene Licht mechanisch verändert wird.10. Smoke detector according to one of claims 1 and 4, characterized in that the proportion of the light received directly from the transmitter by a reference cell is mechanically changed. 11. Rauchdetektor gemäss einem der Patentansprüche 1 bis 10, dadurch gekennzeichnet, dass eine Auswerteschaltung vorgesehen ist, welche bei Ueberschreiten des Empfangssignals über einen vorgegebenen Schwellenwert ein Signal an eine Kippstufe zur Abgabe eines Alarmsignals weiterleitet.11. Smoke detector according to one of the claims 1 to 10, characterized in that an evaluation circuit is provided which, when the received signal exceeds a predetermined threshold value, forwards a signal to a flip-flop for emitting an alarm signal.
EP82110014A 1981-11-11 1982-10-29 Smoke detector Expired EP0079011B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82110014T ATE17061T1 (en) 1981-11-11 1982-10-29 SMOKE DETECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7250/81A CH656474A5 (en) 1981-11-11 1981-11-11 SMOKE DETECTOR.
CH7250/81 1981-11-11

Publications (2)

Publication Number Publication Date
EP0079011A1 true EP0079011A1 (en) 1983-05-18
EP0079011B1 EP0079011B1 (en) 1985-12-18

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EP82110014A Expired EP0079011B1 (en) 1981-11-11 1982-10-29 Smoke detector

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US (1) US4524281A (en)
EP (1) EP0079011B1 (en)
JP (1) JPS5888643A (en)
AT (1) ATE17061T1 (en)
AU (1) AU556837B2 (en)
BR (1) BR8206535A (en)
CA (1) CA1208333A (en)
CH (1) CH656474A5 (en)
DE (1) DE3268057D1 (en)
DK (1) DK502482A (en)
ES (1) ES517588A0 (en)
FI (1) FI75438C (en)
IL (1) IL67159A0 (en)
NO (1) NO157156C (en)
NZ (1) NZ202364A (en)
YU (1) YU252282A (en)
ZA (1) ZA828096B (en)

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GB2177505A (en) * 1985-07-03 1987-01-21 Nittan Co Ltd Photoelectric smoke detectors
EP1993083A3 (en) * 2007-05-18 2009-07-29 Elkron S.p.A. Smoke detection device and method

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Publication number Priority date Publication date Assignee Title
US4814748A (en) * 1987-11-09 1989-03-21 Southwest Laboratories, Inc. Temporary desensitization technique for smoke alarms
GB2259763B (en) * 1991-09-20 1995-05-31 Hochiki Co Fire alarm system
GB2537940B (en) 2015-05-01 2018-02-14 Thorn Security Fire detector drift compensation

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2177505A (en) * 1985-07-03 1987-01-21 Nittan Co Ltd Photoelectric smoke detectors
GB2177505B (en) * 1985-07-03 1989-07-12 Nittan Co Ltd Photoelectric smoke detectors
EP1993083A3 (en) * 2007-05-18 2009-07-29 Elkron S.p.A. Smoke detection device and method

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CH656474A5 (en) 1986-06-30
FI823838A0 (en) 1982-11-09
DE3268057D1 (en) 1986-01-30
AU9017582A (en) 1983-05-19
FI823838L (en) 1983-05-12
ATE17061T1 (en) 1986-01-15
AU556837B2 (en) 1986-11-20
DK502482A (en) 1983-05-12
EP0079011B1 (en) 1985-12-18
NZ202364A (en) 1986-04-11
YU252282A (en) 1985-10-31
NO823754L (en) 1983-05-13
JPS5888643A (en) 1983-05-26
NO157156B (en) 1987-10-19
FI75438C (en) 1988-06-09
ES8309022A1 (en) 1983-10-01
US4524281A (en) 1985-06-18
FI75438B (en) 1988-02-29
ZA828096B (en) 1983-09-28
BR8206535A (en) 1983-09-27
IL67159A0 (en) 1983-03-31
CA1208333A (en) 1986-07-22
NO157156C (en) 1988-01-27
ES517588A0 (en) 1983-10-01

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