EP0253709A1 - Installation de surveillance comportant des détecteurs alimentés par une boucle - Google Patents

Installation de surveillance comportant des détecteurs alimentés par une boucle 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)
English (en)
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/fr
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.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
EP87401525A 1986-07-11 1987-07-01 Installation de surveillance comportant des détecteurs alimentés par une boucle Ceased EP0253709A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610245A FR2601483B1 (fr) 1986-07-11 1986-07-11 Installation de surveillance comportant des detecteurs alimentes par une boucle
FR8610245 1986-07-11

Publications (1)

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

Family

ID=9337417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401525A Ceased EP0253709A1 (fr) 1986-07-11 1987-07-01 Installation de surveillance comportant des détecteurs alimentés par une boucle

Country Status (6)

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

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 (fr) * 2006-02-24 2007-08-31 Airbus France Sas Systeme de detection d'incendie et aeronef equipe d'un tel systeme
CN107715362A (zh) * 2017-09-08 2018-02-23 深圳市智物联网络有限公司 基于物联网的消防监控方法、装置及系统

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 (de) * 1981-06-05 1982-12-15 Hekatron GmbH Schaltungsanordnung zur Übertragung von Messwerten, insbesondere in einem Brandmeldesystem zu einer Zentrale

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 (de) * 1981-06-05 1982-12-15 Hekatron GmbH Schaltungsanordnung zur Übertragung von Messwerten, insbesondere in einem Brandmeldesystem zu einer Zentrale

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 (fr) * 2006-02-24 2007-08-31 Airbus France Sas Systeme de detection d'incendie et aeronef equipe d'un tel systeme
WO2007096523A3 (fr) * 2006-02-24 2007-10-11 Airbus France Systeme de detection d'incendie et aeronef equipe d'un tel systeme
US8094030B2 (en) 2006-02-24 2012-01-10 Airbus Operations Sas Fire detection system and aircraft equipped with such a system
CN107715362A (zh) * 2017-09-08 2018-02-23 深圳市智物联网络有限公司 基于物联网的消防监控方法、装置及系统

Also Published As

Publication number Publication date
FR2601483B1 (fr) 1988-09-16
NO872641L (no) 1988-01-12
FR2601483A1 (fr) 1988-01-15
JPS6320599A (ja) 1988-01-28
FI872835A (fi) 1988-01-12
DK358687D0 (da) 1987-07-10
NO872641D0 (no) 1987-06-24
DK358687A (da) 1988-01-12
FI872835A0 (fi) 1987-06-26

Similar Documents

Publication Publication Date Title
EP0048192B1 (fr) Dispositif pour la vérification automatique d'une pluralité de voyants électriques
US4220949A (en) Electric fence monitor and alarm apparatus and method
FR2570897A1 (fr) Systeme d'alarme pour dispositif de securite, notamment pour panneau de disjoncteurs
FR2575119A1 (fr) Dispositif de commande d'eclairage pour un vehicule
FR2563352A1 (fr) Appareil d'alarme avec commande a distance du mode de fonctionnement
FR2551215A1 (fr) Dispositif de surveillance de la vitesse du flux d'un gaz dans un canal
EP0253709A1 (fr) Installation de surveillance comportant des détecteurs alimentés par une boucle
US4568923A (en) Fire alarm system
FR2932917A1 (fr) Installation de securite a auto-diagnostic perfectionne.
EP0715172A1 (fr) Appareil de contrÔle pour socle de prise de courant à contact de terre
EP0777896B1 (fr) Dispositif de detection d'incendie dans une enceinte fermee
EP0239463A1 (fr) Dispositif d'alimentation électrique d'une unité centrale par au moins un signal de commande, laquelle unité est reliée à au moins une station locale réceptrice
FR2700873A1 (fr) Dispositif antibrouillage radio infraudable pour systèmes de surveillance d'intrusions.
FR2458295A1 (fr) Circuit de controle du dispositif d'allumage d'une installation d'extinction rapide d'incendie
EP0694893B1 (fr) Dispositif de détection d'alarme à boucles de courant, et balise de repérage de sous-zones pour un tel dispositif
FR2631754A1 (fr) Appareil de test d'autonomie pour bloc d'eclairage de securite
FR2741737A1 (fr) Systeme d'alarme a incendie
BE894055A (fr) Procede et appareil d'identification du lieu de changement d'etat d'une partie d'un circuit electrique
FR2831980A1 (fr) Procede de gestion d'un dispositif d'information lumineuse et dispositif mettant en oeuvre ce procede, notamment dans le domaine avionique
EP0121521B1 (fr) Dispositif d'alarme autocontrole et autoprotege
FR2675266A1 (fr) Detecteur de fonction a compteur.
FR2659744A1 (fr) Dispositif de detection de defauts d'isolement electrique pour installation sous tension.
FR2654941A1 (fr) Detecteur d'incendie a fibre optique.
FR2534049A1 (fr) Procede et dispositif pour la surveillance de locaux, notamment d'habitation
CH504743A (fr) Dispositif de surveillance des conditions d'enneigement

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