EP0253709A1 - Monitoring installation with detectors in the form of a loop - Google Patents

Monitoring installation with detectors in the form of a loop Download PDF

Info

Publication number
EP0253709A1
EP0253709A1 EP87401525A EP87401525A EP0253709A1 EP 0253709 A1 EP0253709 A1 EP 0253709A1 EP 87401525 A EP87401525 A EP 87401525A EP 87401525 A EP87401525 A EP 87401525A EP 0253709 A1 EP0253709 A1 EP 0253709A1
Authority
EP
European Patent Office
Prior art keywords
oscillator
detector
loop
fault
indicator
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.)
Ceased
Application number
EP87401525A
Other languages
German (de)
French (fr)
Inventor
Patrick Marmet
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.)
Ferco International Usine de Ferrures de Batiment
Original Assignee
Ferco International Usine de Ferrures de Batiment
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 Ferco International Usine de Ferrures de Batiment filed Critical Ferco International Usine de Ferrures de Batiment
Publication of EP0253709A1 publication Critical patent/EP0253709A1/en
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop

Definitions

  • the invention relates to a monitoring installation which comprises detectors supplied in parallel from a two-wire loop which is connected to a central station.
  • a monitoring installation which comprises detectors supplied in parallel from a two-wire loop which is connected to a central station.
  • Each detector which can for example be a smoke detector comprises an alarm signal generator which actuates an indicator associated with said detector and an oscillator which is connected to the loop, when the detector is activated; a fault signal generator is also provided for each detector which is activated when a fault occurs on the detector itself.
  • the oscillator of said detector injects a signal on the loop, and the indicator of this detector lights up.
  • the signal sent by the oscillator is detected by the central station and we can identify the detector that has been activated thanks to the indicator associated with it.
  • These monitoring installations generally also include a device detecting faults such as short-circuits or interruptions in the supply loop of the detectors. To improve the reliability of these devices, it is now requested that the sensors of the various detectors are continuously monitored and that the detectors can generate a fault signal at the central station when a fault occurs on the detector itself.
  • a fault signal generator which, when activated, causes the loop to open, so that at the station central, a fault signal is obtained as in the case of a fault occurring on the loop (short-circuit or break).
  • This device has a number of drawbacks.
  • First of all at the central station one cannot differentiate between a fault occurring on the loop and a fault occurring on one of the detectors; moreover, even if it is known that it is a fault on a detector, the faulty detector can only be found by replacing all the detectors one by one with a new detector.
  • Finally, when we couple the loop we eliminate the possibility of detecting other events, in particular, since the detectors are no longer supplied with power, we can no longer detect monitored incidents such as the start of a fire.
  • the present invention relates to a monitoring installation of the type described above, in which, at the central station, it is possible to distinguish between the faults due to the loop and those due to a sensor, and this without disturbing normal operation. of the installation in the event of a fault appearing on a detector, the failure of a detector does not stop normal monitoring.
  • the monitoring installation according to the invention is notably remarkable in that the fault signal generator activates a second oscillator which is also connected to said loop and whose frequency is different from that of the first oscillator.
  • a fault concerning a detector can be reported to the central station without the monitoring installation being put out of service; since the frequencies of the two oscillators are different, it is easy to distinguish at the central station between detecting an incident to be monitored and a fault relating to a detector.
  • the aforementioned fault signal generator controls the lighting of the indicator lamp associated with the fault detector. In this way, by examining all the detectors, one can quickly determine which one is out of order and proceed with its replacement or repair.
  • the frequency of the second oscillator is a very low frequency of less than 10 Hz and the output signal of said second oscillator controls the lighting of the indicator light of the detector.
  • the indicator associated with it starts to flash, while it is continuously lit when the detector has detected an incident. This allows in particular in the event that both an incident and a fault occur on another detector, to quickly and unambiguously identify the detector having detected an incident and the faulty detector.
  • FIG. 1 represents a monitoring installation comprising a central station 1 which feeds a two-wire loop 2 to which detectors 3 are connected in parallel; these include specialized sensors intended to detect an incident. These sensors can for example be constituted by ionization chambers for detectors ionic, dark rooms for optical smoke detectors, etc. for an installation intended to monitor the appearance of fire.
  • the two-wire loop 2 comprises two conductors 4 and 5 which are for example connected to a DC voltage source arranged in the central station 1, the conductor 4 being the positive conductor and the conductor 5 being connected to the ground of this supply.
  • each detector 3 injects into the loop 2 a low frequency signal which is detected by the central station 1 and which constitutes a fire alarm for example.
  • an indicator is associated with each of the detectors 3 and this indicator lights up when the detector has detected an incident.
  • a low value resistor 6 is inserted into the positive conductor 4 at the central station 1; it is used to detect the signals injected into the loop by the detectors and also to detect variations in the intensity of the current flowing in loop 2, which makes it possible to detect breaks or short-circuits occurring on loop 2.
  • the end opposite to the central station 1 of the loop 2 is closed by a component such as a low resistance or an oscillator 7 so as to allow detection by the resistance 6 of a cut in the loop 2.
  • FIG. 2 represents the active electronic part of a detector of known type. It comprises an alarm signal generator constituted in the example represented by a comparator 11 which supplies an alarm signal when the detector sensor is activated; this alarm signal is stored in a memory 12 and controls a low-frequency oscillator 13, the output signal of which is injected into the loop via a transistor 14 connected between the positive conductor 4 and the ground 5 of the loop.
  • an alarm signal generator constituted in the example represented by a comparator 11 which supplies an alarm signal when the detector sensor is activated; this alarm signal is stored in a memory 12 and controls a low-frequency oscillator 13, the output signal of which is injected into the loop via a transistor 14 connected between the positive conductor 4 and the ground 5 of the loop.
  • the alarm signal memorized by the memory 12 also controls the lighting of an indicator 15 via a transistor 16.
  • This device comprises a fault signal generator constituted, for example, represented by a comparator 17, the fault signal of which actuates, via a transistor 18, the coil 19 of a normally closed relay, which causes the opening of a contact 21 disposed in the supply loop 2.
  • a fault signal generator constituted, for example, represented by a comparator 17, the fault signal of which actuates, via a transistor 18, the coil 19 of a normally closed relay, which causes the opening of a contact 21 disposed in the supply loop 2.
  • this known device has many drawbacks due to the fact that the fault signal causes the loop 2 to be cut.
  • FIG. 3 represents the active electronic part of a detector of an installation in accordance with the present invention. There are elements 11 to 16 relating to the alarm signal and the fault signal generator 17.
  • the fault signal which is stored in a memory 31 controls an oscillator 32, the output signal of which is injected into loop 2.
  • the output signal from oscillator 32 is sent to loop 2 via an OR logic circuit 33 which receives the signals from the two oscillators 13 and 32 and whose output signal controls transistor 14.
  • the fault signal controls the lighting of the indicator 15; advantageously, this command is made by means of the oscillator 32, the output signal of which is sent to an OR logic circuit 34 which receives the stored alarm signal at its other input and the output of which controls the base of the transistor.
  • the signal delivered by the oscillator 32 is a very low frequency signal whose frequency is less than 10Hz so that a blinking of the indicator 15 is obtained when a fault is detected on the detector concerned. In this way we can discern at first glance on the indicator if it is an alarm or a fault with the detector.
  • the indicator 15 can be constituted by a light-emitting diode.
  • a light-emitting diode with two junctions can be used, one of which is controlled by the stored alarm signal and the other by the stored fault signal; in this case, the OR circuit 34 is not used and a different color display is obtained for an alarm and for a fault in the detector.
  • the oscillator 32 provides a square signal whose frequency is from 1 to 3 Hz, which allows the indicator 15 to flash efficiently.

Abstract

The detectors are supplied in parallel from a two-wire loop connected to a central station. Each detector contains an alarm signal generator (11), which actuates an indicator lamp (15), and a first oscillator (13), which is connected to the said loop when the detector is activated. A malfunction signal generator (17) is activated when a fault appears in the detector itself. The malfunction signal generator (17) activates a second oscillator (32) whose frequency is different from that of the first oscillator (13). Application especially to fire alarms. <IMAGE>

Description

L'invention concerne une installation de sur­veillance qui comporte des détecteurs alimentés en parallèle à partir d'une boucle à deux fils qui est reliée à un poste central. Une telle installation peut par exemple être utilisée pour la détection d'incendies dans des locaux. Chaque détec­teur qui peut par exemple être un détecteur de fumée comporte un générateur de signal d'alarme qui actionne un voyant associé audit détecteur et un oscillateur qui est branché sur la boucle, lorsque le détecteur est activé; on prévoit également pour chaque détecteur, un générateur de signal de dérangement qui est activé lorsque qu'un défaut apparait sur le détecteur lui-mê­me. Lorsqu'un détecteur est activé, par exemple en pré­sence de fumée, l'oscillateur dudit détecteur injecte un signal sur la boucle, et le voyant de ce détecteur s'allume. Le signal envoyé par l'oscillateur est détec­té par le poste central et l'on peut identifier le dé­tecteur qui a été activé grace au voyant qui lui est associé.The invention relates to a monitoring installation which comprises detectors supplied in parallel from a two-wire loop which is connected to a central station. Such an installation can for example be used for the detection of fires in premises. Each detector which can for example be a smoke detector comprises an alarm signal generator which actuates an indicator associated with said detector and an oscillator which is connected to the loop, when the detector is activated; a fault signal generator is also provided for each detector which is activated when a fault occurs on the detector itself. When a detector is activated, for example in the presence of smoke, the oscillator of said detector injects a signal on the loop, and the indicator of this detector lights up. The signal sent by the oscillator is detected by the central station and we can identify the detector that has been activated thanks to the indicator associated with it.

Ces installations de surveillance comportent généralement également un dispositif détectant des dérangements tels que des courts-circuits ou des coupures de la boucle d'alimentation des détecteurs. Pour amé­liorer la fiabilité de ces dispositifs, il est demandé maintenant que les capteurs des différents détecteurs soient surveillés en permanence et que les détecterus puissent engendrer un signal de dérangement au poste central lorsqu'apparaît un défaut sur le détecteur lui-même.These monitoring installations generally also include a device detecting faults such as short-circuits or interruptions in the supply loop of the detectors. To improve the reliability of these devices, it is now requested that the sensors of the various detectors are continuously monitored and that the detectors can generate a fault signal at the central station when a fault occurs on the detector itself.

Actuellement, on prévoit un générateur de signal de dérangement qui, lorsqu'il est activé, en­traîne l'ouverture de la boucle, si bien qu'au poste central on obtient un signal de dérangement comme dans le cas d'un dérangement survenant sur la boucle (court-­circuit ou coupure).Currently, a fault signal generator is provided which, when activated, causes the loop to open, so that at the station central, a fault signal is obtained as in the case of a fault occurring on the loop (short-circuit or break).

Ce dispositif présente un certain nombre d'inconvénients. Tout d'abord au niveau du poste central, on ne peut faire la différence entre un dérangement sur­venu sur la boucle et un dérangement survenu sur un des détecteurs; par ailleurs, même si l'on arrive à savoir qu'il s'agit d'un défaut sur un détecteur, on ne peut trouver le détecteur en défaut qu'en remplacant tous les détecteurs un par un par un détecteur neuf. Enfin, lorsque l'on couple la boucle, on supprime la possibilité de détection d'autres évènements, en parti­culier, les détecteurs n'étant plus alimentés, on ne peut plus détecter les incidents surveillés tels qu'un début d'incendie.This device has a number of drawbacks. First of all at the central station, one cannot differentiate between a fault occurring on the loop and a fault occurring on one of the detectors; moreover, even if it is known that it is a fault on a detector, the faulty detector can only be found by replacing all the detectors one by one with a new detector. Finally, when we couple the loop, we eliminate the possibility of detecting other events, in particular, since the detectors are no longer supplied with power, we can no longer detect monitored incidents such as the start of a fire.

La présente invention a pour objet une ins­tallation de surveillance du type décrit ci-dessus, dans laquelle, au poste central, on peut faire la distinc­tion entre les dérangements dus à la boucle et ceux dus à un capteur, et cela sans perturber le fonctionnement normal de l'installation dans le cas d'un défaut appa­raissant sur un détecteur, la défaillance d'un détecteur n'entraînant pas l'arrêt de la surveillance normale.The present invention relates to a monitoring installation of the type described above, in which, at the central station, it is possible to distinguish between the faults due to the loop and those due to a sensor, and this without disturbing normal operation. of the installation in the event of a fault appearing on a detector, the failure of a detector does not stop normal monitoring.

L'installation de surveillance selon l'in­vention, est notamment remarquable en ce que le généra­teur de signal de dérangement active un deuxième oscil­lateur qui est également branché sur ladite boucle et dont la fréquence est différente de celle du premier oscillateur. De cette manière, un dérangement concernant un détecteur peut être signalé au poste central sans que l'installation de surveillance se soit mise hors service; du fait que les fréquences des deux oscillateurs sont différentes, on peut facilement faire la distinction au poste central entre une détection d'incident à surveiller et un dérangement concernant un détecteur.The monitoring installation according to the invention is notably remarkable in that the fault signal generator activates a second oscillator which is also connected to said loop and whose frequency is different from that of the first oscillator. In this way, a fault concerning a detector can be reported to the central station without the monitoring installation being put out of service; since the frequencies of the two oscillators are different, it is easy to distinguish at the central station between detecting an incident to be monitored and a fault relating to a detector.

Avantageusement, le générateur de signal de dérangement précité commande l'allumage du voyant as­socié au détecteur en dérangement. De cette façon en examinant tous les détecteurs, on peut déterminer très rapidement celui qui est en dérangement et procéder à son remplacement ou à sa remise en état.Advantageously, the aforementioned fault signal generator controls the lighting of the indicator lamp associated with the fault detector. In this way, by examining all the detectors, one can quickly determine which one is out of order and proceed with its replacement or repair.

Selon un mode de réalisation de l'invention, la fréquence du deuxième oscillateur est une très bas­se fréquence inférieure à 10 Hz et le signal de sortie dudit deuxième oscillateur commande l'allumage du vo­yant du détecteur. De cette manière, dans le cas d'un dérangement surveyant à un détecteur, le voyant qui lui est associé se met à clignoter, alors qu'il est allumé de manière continue lorsque le détecteur à dé­tecté un incident. Ceci permet en particulier dans le cas où apparaissent à la fois un incident et un dérange­ment sur un autre détecteur, d'identifier rapidement et sans ambiguïté le détecteur ayant détecté un inci­dent et le détecteur en dérangement.According to one embodiment of the invention, the frequency of the second oscillator is a very low frequency of less than 10 Hz and the output signal of said second oscillator controls the lighting of the indicator light of the detector. In this way, in the event of a fault monitoring a detector, the indicator associated with it starts to flash, while it is continuously lit when the detector has detected an incident. This allows in particular in the event that both an incident and a fault occur on another detector, to quickly and unambiguously identify the detector having detected an incident and the faulty detector.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui suit ainsi que des dessins ci-annexés sur lesquels :

  • - la figure 1 représente une installation de surveillance comportant des détecteurs alimentés par une boucle à deux fils;
  • - la figure 2 représente un circuit électro­nique d'un détecteur de l'art antérieur, et
  • - la figure 3 représente un circuit électro­nique d'un détecteur conforme à la présente invention.
Other characteristics and advantages of the invention will emerge from the description which follows as well as from the appended drawings in which:
  • - Figure 1 shows a monitoring installation comprising detectors supplied by a two-wire loop;
  • FIG. 2 represents an electronic circuit of a detector of the prior art, and
  • - Figure 3 shows an electronic circuit of a detector according to the present invention.

La figure 1 représente une installation de surveillance comportant un poste central 1 qui alimente une boucle à deux fils 2 sur laquelle sont branchés en parallèle des détecteurs 3; ces derniers comprennent des capteurs spécialisés destinés à détecter un inci­dent. Ces capteurs peuvent être par exemple constitués par des chambres d'ionisation pour des détecteurs ioniques, des chambres noires pour des détecteurs opti­ques de fumée, etc. pour une installation destinée à surveiller l'apparition d'incendie. La boucle à deux fils 2 comporte deux conducteurs 4 et 5 qui sont par exemple reliés à une source de tension continue dis­posée dans le poste central 1, le conducteur 4 étant le conducteur positif et le conducteur 5 étant relié à la masse de cette alimentation. En cas de détection d'un incident, chaque détecteur 3 injecte sur la boucle 2 un signal à basse fréquence qui est détecté par le poste central 1 et qui constitue une alarme d'incendie par exemple. Comme cela est décrit plus bas, un voyant est associé à chacun des détecteurs 3 et ce voyant s'allume lorsque le détecteur a détecté un incident. Une résistance de faible valeur 6 est insérée dans le conducteur positif 4 au niveau du poste central 1; elle sert à détecter les signaux injectés dans la bou­cle par les détecteurs et également à détecter des variations de l'intensité du courant circulant dans la boucle 2, ce qui permet de détecter des coupures ou des courts-circuits se produisant sur la boucle 2. L'extrémité opposée au poste central 1 de la boucle 2 est fermée par un composant telle qu'une faible résis­tance ou un oscillateur 7 de manière à permettre la détection par la résistance 6 d'une coupure de la boucle 2.FIG. 1 represents a monitoring installation comprising a central station 1 which feeds a two-wire loop 2 to which detectors 3 are connected in parallel; these include specialized sensors intended to detect an incident. These sensors can for example be constituted by ionization chambers for detectors ionic, dark rooms for optical smoke detectors, etc. for an installation intended to monitor the appearance of fire. The two-wire loop 2 comprises two conductors 4 and 5 which are for example connected to a DC voltage source arranged in the central station 1, the conductor 4 being the positive conductor and the conductor 5 being connected to the ground of this supply. In the event of detection of an incident, each detector 3 injects into the loop 2 a low frequency signal which is detected by the central station 1 and which constitutes a fire alarm for example. As described below, an indicator is associated with each of the detectors 3 and this indicator lights up when the detector has detected an incident. A low value resistor 6 is inserted into the positive conductor 4 at the central station 1; it is used to detect the signals injected into the loop by the detectors and also to detect variations in the intensity of the current flowing in loop 2, which makes it possible to detect breaks or short-circuits occurring on loop 2. The end opposite to the central station 1 of the loop 2 is closed by a component such as a low resistance or an oscillator 7 so as to allow detection by the resistance 6 of a cut in the loop 2.

La figure 2 représente la partie électroni­que active d'un détecteur de type connu. Il comporte un générateur de signal d'alarme constitué dans l'exem­ple représenté par un comparateur 11 qui fournit un signal d'alarme lorsque le capteur du détecteur est activé; ce signal d'alarme est mémorisé dans une mé­moire 12 et commande un oscillateur 13 à basse fré­quence dont le signal de sortie est injecté dans la boucle par l'intermédiaire d'un transistor 14 branché entre le conducteur positif 4 et la masse 5 de la boucle.FIG. 2 represents the active electronic part of a detector of known type. It comprises an alarm signal generator constituted in the example represented by a comparator 11 which supplies an alarm signal when the detector sensor is activated; this alarm signal is stored in a memory 12 and controls a low-frequency oscillator 13, the output signal of which is injected into the loop via a transistor 14 connected between the positive conductor 4 and the ground 5 of the loop.

Le signal d'alarme mémorisé par la mémoire 12 commande également l'allumage d'un voyant 15 par l'intermédiaire d'un transistor 16.The alarm signal memorized by the memory 12 also controls the lighting of an indicator 15 via a transistor 16.

Afin d'améliorer la fiabilité de telles ins­tallations de surveillance, on leur adjoint un disposi­tif permettant de surveiller en permanence les capteurs de chacun des détecteurs et de signaler tous dérangements survenant dans un des capteurs. Ce dispositif comporte un,générateur de signal de dérangement constitué dans exemple représenté par un comparateur 17 dont le signal de dérangement actionne par l'intermédiaire d'un transistor 18 la bobine 19 d'un relais normalement fermé, ce qui entraîne l'ouverture d'un contact 21 disposé dans la boucle d'alimentation 2. Comme cela est indiqué plus haut, ce dispositif connu présente de nombreux inconvénients dus au fait que le signal de dérangement entraîne la coupure de la boucle 2.In order to improve the reliability of such monitoring installations, a device is added to them which makes it possible to continuously monitor the sensors of each of the detectors and to report any faults occurring in one of the sensors. This device comprises a fault signal generator constituted, for example, represented by a comparator 17, the fault signal of which actuates, via a transistor 18, the coil 19 of a normally closed relay, which causes the opening of a contact 21 disposed in the supply loop 2. As indicated above, this known device has many drawbacks due to the fact that the fault signal causes the loop 2 to be cut.

La figure 3 représente la partie électroni­que active d'un détecteur d'une installation conforme à la présente invention. On y retrouve les éléments 11 à 16 concernant le signal d'alarme et le générateur de signal de dérangement 17.FIG. 3 represents the active electronic part of a detector of an installation in accordance with the present invention. There are elements 11 to 16 relating to the alarm signal and the fault signal generator 17.

Conformément à l'invention, le signal de dé­rangement qui est mémorisé dans une mémoire 31 commande un oscillateur 32 dont le signal de sortie est injecté dans le boucle 2.In accordance with the invention, the fault signal which is stored in a memory 31 controls an oscillator 32, the output signal of which is injected into loop 2.

Avantageusment, le signal de sortie de l'oscillateur 32 est envoyé sur la boucle 2 par l'in­termédiaire d'un circuit logique OU 33 qui reçoit les signaux des deux oscillateur 13 et 32 et dont le signal de sortie commande le transistor 14.Advantageously, the output signal from oscillator 32 is sent to loop 2 via an OR logic circuit 33 which receives the signals from the two oscillators 13 and 32 and whose output signal controls transistor 14.

On peut prévoir également que le signal de dérangement commande l'allumage du voyant 15; avantageusement, cette commande est faite par l'intermé­diaire de l'oscillateur 32 dont le signal de sortie est envoyé sur un circuit logique OU 34 qui reçoit sur son autre entrée le signal d'alarme mémorisé et dont la sortie commande la base du transistor. Le signal délivré par l'oscillateur 32 est un signal à très basse fréquence dont la fréquence est inférieure à 10Hz si bien que l'on obtient un clignotement du voyant 15 lorsque l'on détecte un dérangement sur le détecteur concerné. De cette manière on peut discerner du premier coup d'oeil sur le voyant s'il s'agit d'une alarme ou du dérangement du détecteur.It is also possible to provide that the fault signal controls the lighting of the indicator 15; advantageously, this command is made by means of the oscillator 32, the output signal of which is sent to an OR logic circuit 34 which receives the stored alarm signal at its other input and the output of which controls the base of the transistor. The signal delivered by the oscillator 32 is a very low frequency signal whose frequency is less than 10Hz so that a blinking of the indicator 15 is obtained when a fault is detected on the detector concerned. In this way we can discern at first glance on the indicator if it is an alarm or a fault with the detector.

Le voyant 15 peut être constitué par une diode électroluminescente. Selon une variante de réali­sation on peut utiliser une diode électroluminescente à deux jonctions dont l'une est commandée par le signal d'alarme mémorisé et l'autre par le signal de dérangement mémorisé; dans ce cas, on n'utilise pas le circuit OU 34 et on obtient une visualisation de couleur différente pour une alarme et pour un dérangement du détecteur.The indicator 15 can be constituted by a light-emitting diode. According to an alternative embodiment, a light-emitting diode with two junctions can be used, one of which is controlled by the stored alarm signal and the other by the stored fault signal; in this case, the OR circuit 34 is not used and a different color display is obtained for an alarm and for a fault in the detector.

Selon un mode de réalisation de l'invention, l'oscillateur 32 fournit un signal carré dont la fré­quence est de 1 à 3 Hz, ce qui permet un clignotement efficace du voyant 15.According to one embodiment of the invention, the oscillator 32 provides a square signal whose frequency is from 1 to 3 Hz, which allows the indicator 15 to flash efficiently.

Claims (7)

1°. Installation de surveillance comportant des détecteurs (3) alimentés en parallèle à partir d'une boucle (2) à deux fils reliée à un poste central (1), chaque détecteur (3) comportant un générateur de signal d'alarme (11) actionnant un voyant (15) et un premier oscillateur (13) qui est branché sur ladite boucle (2), lorsque le détecteur est activé et un gé­nérateur de signal de dérangement (17) qui est activé lorsqu'un défaut apparaît sur le détecteur lui-même, caractérisé en ce que le générateur de signal de déran­gement (17) active un deuxième oscillateur (32) dont la fréquence est différente de celle du premier oscil­lateur (13).1 °. Monitoring installation comprising detectors (3) supplied in parallel from a two-wire loop (2) connected to a central station (1), each detector (3) comprising an alarm signal generator (11) actuating an indicator (15) and a first oscillator (13) which is connected to said loop (2), when the detector is activated and a fault signal generator (17) which is activated when a fault appears on the detector itself same, characterized in that the fault signal generator (17) activates a second oscillator (32) whose frequency is different from that of the first oscillator (13). 2°. Installation de surveillance selon la revendication 1, caractérisée en ce que le générateur de signal de dérangement (17) commande l'allumage du voyant (15).2 °. Monitoring installation according to claim 1, characterized in that the fault signal generator (17) controls the lighting of the indicator (15). 3°. Installation de surveillance selon la revendication 2, caractérisé en ce que la fréquence du deuxième oscillateur 32 est une très basse fréquence inférieure à 10 Hz, et en ce que le signal de sortie du deuxième oscillateur (32) commande l'allumage du voyant (15).3 °. Monitoring installation according to claim 2, characterized in that the frequency of the second oscillator 32 is a very low frequency less than 10 Hz, and in that the output signal of the second oscillator (32) controls the lighting of the indicator (15 ). 4°. Installation de surveillance selon la revendication (3), caractérisée en ce que l'allumage du voyant (15) du détecteur (3) est commandé par l'in­termédiaire d'un circuit logique OU 34 qui reçoit sur ses deux entrées, d'une part le signal d'alarme mémo­risé, et d'autre part, le signal de sortie du deuxième oscillateur (32).4 °. Monitoring installation according to claim (3), characterized in that the lighting of the indicator (15) of the detector (3) is controlled by means of an OR 34 logic circuit which receives on its two inputs, a firstly the stored alarm signal, and secondly, the output signal from the second oscillator (32). 5°. Installation de surveillance selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le signal de sortie du premier oscillateur (12) et le signal de sortie du deuxième oscillateur (32) sont injectés dans la boucle (2) par l'intermédiaire d'un circuit OU (33).5 °. Monitoring installation according to any one of Claims 1 to 4, characterized in that the output signal from the first oscillator (12) and the output signal from the second oscillator (32) are injected into the loop (2) via an OR circuit (33). 6°. Installation de surveillance selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le voyant de détection (15) est une diode électro­luminescente.6 °. Monitoring installation according to any one of claims 1 to 5, characterized in that the detection indicator (15) is a light-emitting diode. 7°. Installation de surveillance selon la revendication 6, caractérisé en ce que le voyant de détection (15) est une diode électroluminescente à deux jonctions, une première jonction étant commandée par le signal d'alarme mémorisé et une deuxième jonc­tion étant commandée par le signal de dérangement mémorisé.7 °. Monitoring installation according to claim 6, characterized in that the detection indicator (15) is a light-emitting diode with two junctions, a first junction being controlled by the stored alarm signal and a second junction being controlled by the fault signal memorized.
EP87401525A 1986-07-11 1987-07-01 Monitoring installation with detectors in the form of a loop Ceased EP0253709A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610245 1986-07-11
FR8610245A FR2601483B1 (en) 1986-07-11 1986-07-11 MONITORING INSTALLATION COMPRISING SENSORS SUPPLIED BY A LOOP

Publications (1)

Publication Number Publication Date
EP0253709A1 true EP0253709A1 (en) 1988-01-20

Family

ID=9337417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401525A Ceased EP0253709A1 (en) 1986-07-11 1987-07-01 Monitoring installation with detectors in the form of a loop

Country Status (6)

Country Link
EP (1) EP0253709A1 (en)
JP (1) JPS6320599A (en)
DK (1) DK358687A (en)
FI (1) FI872835A (en)
FR (1) FR2601483B1 (en)
NO (1) NO872641L (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257313A (en) * 1991-06-26 1993-01-06 Int Computers Ltd Variable intensity digital display
GB2286735A (en) * 1994-02-05 1995-08-23 Thorn Security Monitoring system and unit with fault detection
EP0991042A2 (en) * 1998-09-28 2000-04-05 Apollo Fire Detectors Limited Signalling device and monitoring system
FR2897968A1 (en) * 2006-02-24 2007-08-31 Airbus France Sas Concerned area`s fire detection system for aircraft, has two detectors connected to terminals of fire detection unit and providing respective values of electrical magnitude in their determined state, where two values differ from each other
CN107715362A (en) * 2017-09-08 2018-02-23 深圳市智物联网络有限公司 Fire fighting monitoring method, apparatus and system based on Internet of Things

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886534A (en) * 1973-01-08 1975-05-27 Polar Corp Security system
GB2006955A (en) * 1977-10-28 1979-05-10 Nittan Co Ltd Optical smoce detector
US4302753A (en) * 1978-01-26 1981-11-24 Pittway Corporation Multi-function combustion detecting device
US4306230A (en) * 1979-12-10 1981-12-15 Honeywell Inc. Self-checking photoelectric smoke detector
EP0066879A1 (en) * 1981-06-05 1982-12-15 Hekatron GmbH Circuit arrangement for the transmission of measured values to a central station, especially for a fire signalling system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886534A (en) * 1973-01-08 1975-05-27 Polar Corp Security system
GB2006955A (en) * 1977-10-28 1979-05-10 Nittan Co Ltd Optical smoce detector
US4302753A (en) * 1978-01-26 1981-11-24 Pittway Corporation Multi-function combustion detecting device
US4306230A (en) * 1979-12-10 1981-12-15 Honeywell Inc. Self-checking photoelectric smoke detector
EP0066879A1 (en) * 1981-06-05 1982-12-15 Hekatron GmbH Circuit arrangement for the transmission of measured values to a central station, especially for a fire signalling system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257313A (en) * 1991-06-26 1993-01-06 Int Computers Ltd Variable intensity digital display
GB2257313B (en) * 1991-06-26 1995-01-04 Int Computers Ltd Visual indication
GB2286735A (en) * 1994-02-05 1995-08-23 Thorn Security Monitoring system and unit with fault detection
GB2286735B (en) * 1994-02-05 1998-03-04 Thorn Security A monitoring system
EP0991042A2 (en) * 1998-09-28 2000-04-05 Apollo Fire Detectors Limited Signalling device and monitoring system
EP0991042A3 (en) * 1998-09-28 2001-01-10 Apollo Fire Detectors Limited Signalling device and monitoring system
GB2341964B (en) * 1998-09-28 2002-12-11 Apollo Fire Detectors Ltd Signalling device and monitoring system
FR2897968A1 (en) * 2006-02-24 2007-08-31 Airbus France Sas Concerned area`s fire detection system for aircraft, has two detectors connected to terminals of fire detection unit and providing respective values of electrical magnitude in their determined state, where two values differ from each other
WO2007096523A3 (en) * 2006-02-24 2007-10-11 Airbus France Fire detection system and aircraft equipped with such a system
US8094030B2 (en) 2006-02-24 2012-01-10 Airbus Operations Sas Fire detection system and aircraft equipped with such a system
CN107715362A (en) * 2017-09-08 2018-02-23 深圳市智物联网络有限公司 Fire fighting monitoring method, apparatus and system based on Internet of Things

Also Published As

Publication number Publication date
FI872835A0 (en) 1987-06-26
FR2601483A1 (en) 1988-01-15
FI872835A (en) 1988-01-12
DK358687D0 (en) 1987-07-10
NO872641L (en) 1988-01-12
NO872641D0 (en) 1987-06-24
JPS6320599A (en) 1988-01-28
DK358687A (en) 1988-01-12
FR2601483B1 (en) 1988-09-16

Similar Documents

Publication Publication Date Title
EP0048192B1 (en) Arrangement for automatically checking a plurality of indicating lamps
US4220949A (en) Electric fence monitor and alarm apparatus and method
FR2570897A1 (en) ALARM SYSTEM FOR A SECURITY DEVICE, PARTICULARLY FOR A CIRCUIT BREAKER PANEL
FR2575119A1 (en) LIGHTING CONTROL DEVICE FOR A VEHICLE
FR2563352A1 (en) ALARM APPARATUS WITH REMOTE CONTROL OF OPERATING MODE
EP0253709A1 (en) Monitoring installation with detectors in the form of a loop
US4568923A (en) Fire alarm system
FR2932917A1 (en) Safety installation, has central monitoring station connected to end of double-wire line, and time delay circuit for placing, after triggered, terminal connection formed of two parallel branches, in impedance state during monitoring phase
EP0715172A1 (en) Testing device for earthed wall socket
EP0239463B1 (en) Device for the electrical supply of a central unit, connected to a least one local reception station, by at least one command signal
EP0777896B1 (en) Device for detecting a fire in a closed-off enclosure
FR2700873A1 (en) Anti-jamming radio anti-jamming device for intrusion monitoring systems.
EP0694893B1 (en) Alarm detecting device with currant loops and beacon for locating sub-zones for such a device
FR2631754A1 (en) SELF-POWERED TEST APPARATUS FOR SAFETY LIGHTING BLOCK
FR2741737A1 (en) FIRE ALARM SYSTEM
BE894055A (en) METHOD AND APPARATUS FOR IDENTIFYING THE LOCATION OF CHANGE OF STATE OF A PART OF AN ELECTRIC CIRCUIT
FR2831980A1 (en) METHOD FOR MANAGING A LUMINOUS INFORMATION DEVICE AND DEVICE USING THE SAME, IN PARTICULAR IN THE AVIONIC DOMAIN
WO1992012505A1 (en) Alarm condition detector such as dangerous concentration detector of noxious gases in a medium
EP0121521B1 (en) Self-controlled and self protected alarm device
FR2675266A1 (en) Detector of operational state with meter
JPH0565918B2 (en)
FR2659744A1 (en) Device for detecting faults in electrical insulation for a current-carrying installation
FR2654941A1 (en) Fibre-optic fire detector
FR2534049A1 (en) Method and device for monitoring premises, especially dwellings
GB1604634A (en) Signalling apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19880229

17Q First examination report despatched

Effective date: 19891214

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19920131

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MARMET, PATRICK