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EP0676733A1 - Système de détection et son procédé de fonctionnement - Google Patents

Système de détection et son procédé de fonctionnement Download PDF

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Publication number
EP0676733A1
EP0676733A1 EP95302274A EP95302274A EP0676733A1 EP 0676733 A1 EP0676733 A1 EP 0676733A1 EP 95302274 A EP95302274 A EP 95302274A EP 95302274 A EP95302274 A EP 95302274A EP 0676733 A1 EP0676733 A1 EP 0676733A1
Authority
EP
European Patent Office
Prior art keywords
detectors
signals
detection system
detector
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95302274A
Other languages
German (de)
English (en)
Inventor
Thomas Lovell
Thomas Vlasits
Peter Gale
Peter David Minns
Edward Korolkiewicz
David Llewellyn Lewis
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.)
Harrison Brothers (Steeplejacks) Ltd
Original Assignee
Harrison Brothers (Steeplejacks) Ltd
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 Harrison Brothers (Steeplejacks) Ltd filed Critical Harrison Brothers (Steeplejacks) Ltd
Publication of EP0676733A1 publication Critical patent/EP0676733A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G08B25/10—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 wireless transmission systems

Definitions

  • the present invention is concerned with detection systems comprising a multiplicity of detectors.
  • the invention includes a method of operating such a detection system.
  • the system and method are particularly suitable for detecting fires but may be used, suitably adapted, for detecting other eventualities, such as intrusions or other events threatening the security of a location.
  • Detectors which operate to give warning of the existence of conditions signifying a fire for example are widely used, either singly or as a group of detectors spread around the site protected by them. Single detectors may give a direct audible signal but such a signal may be of little value on an extensive site and may pass unheard. It is therefore usual for the warning signals from a group of detectors to be received at a central control unit, at which it is possible to respond quickly to any signal received.
  • signals may be generated at a detector in two ways.
  • the signal is a direct response to the occurrence of an incident, for example the onset of fire conditions or the presence of a fault in the detector, or the signal is produced as a matter of routine at a pre-determined interval, for example to verify that the detector is functioning correctly. It may be a statutory requirement or a strong recommendation that such latter verification signals be transmitted, say, every half-hour or every few minutes.
  • signals from two or more detectors may be transmitted at overlapping times, although the intention is that the signals should not overlap.
  • the difficulty is that the timing of the individual transmissions becomes increasingly critical as the number of detectors and/or the planned frequency of verification increases, with the result that the accuracy of the individual timers controlling the individual detectors becomes a more important factor. Timers of adequate accuracy over a prolonged period are not readily available; the timing achievable by available timers which are otherwise suitable for the purpose tends to drift over a period.
  • the detection system comprises a number of detectors for fire or other eventualities, each detector including a radio receiver, a radio transmitter and a timer adapted to determine the timing of the operation of said receiver and of said transmitter, and a monitoring unit adapted to transmit to each detector a synchronisation signal whereby the operations of said timers are co-ordinated and to receive signals from said detectors in predetermined sequence.
  • the method according to the invention of operating a detection system comprising a number of detectors each including a radio receiver, a radio transmitter and a timer, comprises transmitting to said detectors synchronisation signals to co-ordinate the operations of said timers and receiving and monitoring, in predetermined sequence, signals from said detectors.
  • each detector may send its required signal, for example an "OK" signal verifying that the detector is functioning properly, only in its own, unique time-slot, at the time set by its timer, which is synchronised by the signals from the monitoring unit.
  • the required signal for example an "OK” signal verifying that the detector is functioning properly
  • only in its own, unique time-slot at the time set by its timer, which is synchronised by the signals from the monitoring unit.
  • the transmission of "emergency" signals for example a fire warning
  • the monitoring unit transmits to the detector an acknowledgement of receipt of the information, in a time-slot reserved for such acknowledgements.
  • a receiver at the site of each detector requires a source of power to enable the detector to receive and transmit signals. While that power may be provided from the mains electrical supply, it is convenient, and simplifies installation of the detectors, for them to be powered by batteries, which may advantageously be of a "long-life" type. It is not necessary for the receiver to operate continuously, ready to receive synchronisation signals from the monitoring unit; such continuous operation would require an unduly high consumption of power and would, in the case of a battery, greatly limit its operating life.
  • the provision of a timer at each detector allows the receiver to be switched on just before it is due to receive a signal and to be switched off after the signal has been received, and for the transmitter to be operated only at the time when it is due to transmit a message.
  • a signal transmitted from the monitoring unit at predetermined intervals includes a check signal whereby the local timer is brought into alignment with the required timing sequence if it has departed from it.
  • the illustrated detection system is based upon just two monitoring units in the form of control panels 11, 12 but may readily include several control panels, depending essentially upon the total number of detectors in the system.
  • three detectors 13, 14, 15 are associated with control panel 11 and three detectors 16, 17, 18 are similarly controlled by control panel 12.
  • An alarm sounder 19 is associated with control panel 11 and two further alarm sounders 20, 21 are associated with control panel 12.
  • the arrows in Fig. 1 represent radio links and as shown, signals can be sent and received in both directions between each of the control panels and its associated detectors and sounders, and also between the control panels.
  • Each of the detectors 13 to 18 includes within it four components, as represented schematically in Fig. 2. Those components are a radio signal receiver 22, a transmitter 23, a timer unit 24 and a battery 25 which provides the electrical power for the other three components.
  • the receiver 22 is designed to receive radio signals transmitted by the control panel with which it is associated, while the transmitter 23 is designed to send radio signals to the control panel, either at a predetermined interval to report the status of the detector or, in a time-slot reserved for that purpose, to indicate an "alarm" condition (for example fire or an intruder) detected by a sensor (not shown) in the detector.
  • each type of signal for example status-reporting signals, alarm signals and signals confirming the receipt of transmitted information, is consigned a specific short time slot or several time slots within which it may be transmitted.
  • Each timer unit 24 controls the timing of those time-slots in sequence and the synchronising of the operation of the timer units 24 is controlled by the regular transmission of a common time reference signal (called in this example the "broadcast" signal) by the control units 11, 12 to their associated detectors or, preferably, by a master panel (not shown).
  • Time slots bearing the letter 'B' are the slots reserved for the transmission of the synchronising "broadcast" signal.
  • Time slots 'C' are for signals between control panels.
  • the time slots identified by the letter 'S' are dedicated to signals from the detectors reporting their status at predetermined intervals, for example that the individual detector is operating satisfactorily or requires attention.
  • time slots 'A' are reserved for alarm signals. Power from the battery 25 to the receiver 22, to enable it to receive the "broadcast" signal or an acknowledgement of a signal previously transmitted, is provided only in those time slots in which the receiver is required to operate.
  • the detection system and method according to the present invention make it possible for a multiplicity of detectors to be monitored by radio from a central control position without the potential for conflict of signals which is a feature of presently available such systems.
  • the detectors may all be associated with the same monitoring unit or several such units may be provided, each synchronised by a central unit and each associated with several of the detectors, thereby achieving overall synchronisation of all of the detectors.
  • adjacent detection systems in nearby locations may be so controlled that potential conflict of signals from the adjacent systems is also avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
EP95302274A 1994-04-09 1995-04-05 Système de détection et son procédé de fonctionnement Withdrawn EP0676733A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9407098A GB9407098D0 (en) 1994-04-09 1994-04-09 Detection system and method of operating same
GB9407098 1994-04-09

Publications (1)

Publication Number Publication Date
EP0676733A1 true EP0676733A1 (fr) 1995-10-11

Family

ID=10753319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95302274A Withdrawn EP0676733A1 (fr) 1994-04-09 1995-04-05 Système de détection et son procédé de fonctionnement

Country Status (2)

Country Link
EP (1) EP0676733A1 (fr)
GB (2) GB9407098D0 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811959A1 (fr) * 1996-06-07 1997-12-10 GRUNDIG Aktiengesellschaft Système d'alarme commandé par radio avec sous-stations et transmission sûr de données
WO1999059868A1 (fr) * 1998-05-15 1999-11-25 Deep Blue Technology Ag Dispositif pour produire un signal d'avertissement, en particulier pour helicoptere
EP0911775A3 (fr) * 1997-09-30 2000-12-27 Siemens Aktiengesellschaft Procédé de transmission radio dans un système de signalisation d'alarmes
WO2001078033A3 (fr) * 2000-04-07 2002-01-31 Seca Gmbh Dispositif d'alarme
WO2002084620A1 (fr) * 2001-04-18 2002-10-24 Harrison Brothers (Steeplejacks) Limited Systeme de communication alarme radiofrequence
FR2839593A1 (fr) * 2002-05-07 2003-11-14 Radio Systemes Ingenierie Procede de communication radiofrequence entre plusieurs dispositifs et systeme de surveillance mettant en oeuvre un tel procede
WO2003098134A1 (fr) * 2002-05-16 2003-11-27 BSH Bosch und Siemens Hausgeräte GmbH Appareil de congelation pourvu d'une fonction de degivrage et son procede de fonctionnement
EP1901256A1 (fr) * 2006-09-18 2008-03-19 Siemens Building Technologies Fire & Security Products GmbH & Co. oHG Procédé destiné à la transmission radio dans une cellule de système de détection des dangers
US7463145B2 (en) 2005-09-22 2008-12-09 Rsi Video Technologies, Inc. Security monitoring arrangement and method using a common field of view
US7835343B1 (en) 2006-03-24 2010-11-16 Rsi Video Technologies, Inc. Calculating transmission anticipation time using dwell and blank time in spread spectrum communications for security systems
US8081073B2 (en) 2005-09-22 2011-12-20 Rsi Video Technologies, Inc. Integrated motion-image monitoring device with solar capacity
US8155105B2 (en) 2005-09-22 2012-04-10 Rsi Video Technologies, Inc. Spread spectrum wireless communication and monitoring arrangement and method
EP2360980A4 (fr) * 2008-12-19 2013-08-14 Panasonic Corp Système de communication sans fil
US8714449B2 (en) 2008-02-07 2014-05-06 Rsi Video Technologies, Inc. Method and device for arming and disarming status in a facility monitoring system
US9679455B2 (en) 2005-09-22 2017-06-13 Rsi Video Technologies, Inc. Security monitoring with programmable mapping

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3529127A1 (de) * 1985-08-14 1987-02-19 Bbc Brown Boveri & Cie Verfahren zur datenuebertragung bei alarmanlagen
EP0390666A1 (fr) * 1989-03-28 1990-10-03 Elf Antar France Système de surveillance d'installations industrielles
WO1994003881A1 (fr) * 1992-08-06 1994-02-17 Menvier (Electronic Engineers) Ltd. Systeme de detection d'incendie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8726830D0 (en) * 1987-11-17 1987-12-23 Martin J A Monitoring system
GB2271691A (en) * 1992-09-21 1994-04-20 Oconnor P J Synchronisation of a radio telemetry system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3529127A1 (de) * 1985-08-14 1987-02-19 Bbc Brown Boveri & Cie Verfahren zur datenuebertragung bei alarmanlagen
EP0390666A1 (fr) * 1989-03-28 1990-10-03 Elf Antar France Système de surveillance d'installations industrielles
WO1994003881A1 (fr) * 1992-08-06 1994-02-17 Menvier (Electronic Engineers) Ltd. Systeme de detection d'incendie

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811959A1 (fr) * 1996-06-07 1997-12-10 GRUNDIG Aktiengesellschaft Système d'alarme commandé par radio avec sous-stations et transmission sûr de données
EP0911775A3 (fr) * 1997-09-30 2000-12-27 Siemens Aktiengesellschaft Procédé de transmission radio dans un système de signalisation d'alarmes
WO1999059868A1 (fr) * 1998-05-15 1999-11-25 Deep Blue Technology Ag Dispositif pour produire un signal d'avertissement, en particulier pour helicoptere
WO2001078033A3 (fr) * 2000-04-07 2002-01-31 Seca Gmbh Dispositif d'alarme
WO2002084620A1 (fr) * 2001-04-18 2002-10-24 Harrison Brothers (Steeplejacks) Limited Systeme de communication alarme radiofrequence
FR2839593A1 (fr) * 2002-05-07 2003-11-14 Radio Systemes Ingenierie Procede de communication radiofrequence entre plusieurs dispositifs et systeme de surveillance mettant en oeuvre un tel procede
EP1363260A1 (fr) * 2002-05-07 2003-11-19 Radio Systèmes Ingenierie (Société Anonyme) Procédé de communication radiofréquence entre plusieurs dispositifs et système de surveillance mettant en oeuvre un tel procédé
RU2313742C2 (ru) * 2002-05-16 2007-12-27 Бсх Бош Унд Сименс Хаусгерете Гмбх Морозильник с функцией оттаивания и способ работы этого морозильника
WO2003098134A1 (fr) * 2002-05-16 2003-11-27 BSH Bosch und Siemens Hausgeräte GmbH Appareil de congelation pourvu d'une fonction de degivrage et son procede de fonctionnement
US7320226B2 (en) 2002-05-16 2008-01-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Freezer with defrost function and method for operating the freezer
US7463145B2 (en) 2005-09-22 2008-12-09 Rsi Video Technologies, Inc. Security monitoring arrangement and method using a common field of view
US8081073B2 (en) 2005-09-22 2011-12-20 Rsi Video Technologies, Inc. Integrated motion-image monitoring device with solar capacity
US8155105B2 (en) 2005-09-22 2012-04-10 Rsi Video Technologies, Inc. Spread spectrum wireless communication and monitoring arrangement and method
US9679455B2 (en) 2005-09-22 2017-06-13 Rsi Video Technologies, Inc. Security monitoring with programmable mapping
US7835343B1 (en) 2006-03-24 2010-11-16 Rsi Video Technologies, Inc. Calculating transmission anticipation time using dwell and blank time in spread spectrum communications for security systems
EP1901256A1 (fr) * 2006-09-18 2008-03-19 Siemens Building Technologies Fire & Security Products GmbH & Co. oHG Procédé destiné à la transmission radio dans une cellule de système de détection des dangers
US8714449B2 (en) 2008-02-07 2014-05-06 Rsi Video Technologies, Inc. Method and device for arming and disarming status in a facility monitoring system
EP2360980A4 (fr) * 2008-12-19 2013-08-14 Panasonic Corp Système de communication sans fil

Also Published As

Publication number Publication date
GB9407098D0 (en) 1994-06-01
GB9507126D0 (en) 1995-05-31
GB2288263A (en) 1995-10-11

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