EP1035528B1 - Fire alarm system - Google Patents

Fire alarm system Download PDF

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Publication number
EP1035528B1
EP1035528B1 EP00301624A EP00301624A EP1035528B1 EP 1035528 B1 EP1035528 B1 EP 1035528B1 EP 00301624 A EP00301624 A EP 00301624A EP 00301624 A EP00301624 A EP 00301624A EP 1035528 B1 EP1035528 B1 EP 1035528B1
Authority
EP
European Patent Office
Prior art keywords
detector
activated
control panel
smoke
alarm system
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.)
Revoked
Application number
EP00301624A
Other languages
German (de)
French (fr)
Other versions
EP1035528A2 (en
EP1035528A3 (en
Inventor
Manhar Amlani
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.)
RAFIKI HOLDINGS LIMITED
Original Assignee
RAFIKI HOLDINGS 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
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Application filed by RAFIKI HOLDINGS Ltd filed Critical RAFIKI HOLDINGS Ltd
Publication of EP1035528A2 publication Critical patent/EP1035528A2/en
Publication of EP1035528A3 publication Critical patent/EP1035528A3/en
Application granted granted Critical
Publication of EP1035528B1 publication Critical patent/EP1035528B1/en
Anticipated expiration legal-status Critical
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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
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components

Definitions

  • This invention relates to a fire alarm system of the type disclosed in US 4 568 924 comprising a control panel and a plurality of remote smoke detectors connected to the control panel, each detector being arranged to change from a standby condition to an alarm condition when activated by smoke, the control panel being arranged to trigger an alarm signal only when the same detector has changed from its standby condition to the alarm condition at least twice within a predetermined time period.
  • control panel is triggered to emit an audible warning signal and perhaps alert the emergency services when one or more of the smoke detectors changes from a standby condition to an alarm condition when smoke is detected.
  • a fire alarm system of the type disclosed in US 4 568 924 which is characterised in that whenever a detector changes from a standby condition to an alarm condition, a sounder associated therewith is energised to produce an audible output.
  • the smoke detector in the flat will change from its standby condition to an alarm condition, whereupon the sounder associated therewith provides a localised warning that its associated detector has been activated, so that the occupant can take steps to clear the smoke before the detector is activated again and the alarm condition is triggered.
  • control panel is arranged to reset an activated detector to said standby condition at least once. If the detector was activated by smoke from cooking or from burnt toast, the smoke will diffuse quickly and the detector will not be activated again, and the alarm will not be triggered.
  • the detector will be reactivated immediately and the alarm will be triggered.
  • control panel is arranged to reset an activated detector, a predetermined time period after it has been activated.
  • the time period is preferably sufficiently long to allow the smoke from a false alarm to diffuse before the alarm is reset.
  • the time period is adjustable.
  • the number of successive times that each detector has to be activated before the alarm signal is triggered is adjustable.
  • control panel is arranged to silence the sounder in the event that its associated detector is not activated again within said predetermined time period.
  • control panel is arranged to trigger an alarm signal, when two different detectors are activated by smoke, signalling that the fire is spreading.
  • a fire alarm system comprising a control panel 13, which is connected to an alarm circuit consisting of two zones 17, 18.
  • Each zone comprises a plurality of combined detector and sounder devices 10 connected in parallel across a pair of wires 11, 12 extending from the control panel 13.
  • a plurality of manual call points 14 are also connected in parallel across the wires 11, 12.
  • Each detector/sounder device 10 comprises a heat sensor and a smoke sensor, say of the optical-scatter type.
  • the system may be installed in a house, which is divided into a plurality of self-contained flats, with the control panel 13 being located in the entrance hall and one or more detector/sounder devices 10 located in each flat.
  • control panel is triggered to energise the sounder in each device 10, so as to provide an audible indication that there is a fire.
  • a disadvantage of this arrangement is that smoke is often created whilst cooking, say when toast is burnt and this smoke can trigger an alarm condition, which causes annoyance to the occupant of each flat, especially if it is a common occurrence.
  • the alarm system in accordance with this invention alleviates this problem, as will be explained.
  • a detector/sounder device 10 When a detector/sounder device 10 detects smoke, it changes from its Standby Mode to an Alarm Mode, wherein it latches into a condition in which an alarm signal is applied to the wires 11, 12. The sounder in the device 10 is also activated to produce an audible alarm signal.
  • the control panel 13 detects the alarm signal and after a period of 5-10 seconds, the control panel sends signal along the wires 11, 12 to rest the activated detector/sounder device 10 back into its Standby Mode.
  • the detector/sounder device 10 was triggered by smoke from cooking, the smoke will disperse quickly and the detector/sounder device 10 will not be reactivated.
  • the control panel 13 is programmed to send a signal to energise each of the sounders in the devices 10 only when any particular detector/sounder device 10 has been activated at least twice within a predetermined time period, although the control panel 13 preferably resets the activated detector/sounder device 10 several times before energising the sounders, in order to make allow time for smoke from cooking to disperse.
  • the sounders are only energised to produce an audible warning signal when a detector is activated on say three successive occasions over a 30 second period, thereby indicating that smoke is persisting in the room and that a real fire must have broken out.
  • the number of times which the detector/sounder devices 10 are reset is preferably adjustable and time between activation and resetting is preferably also adjustable.

Abstract

A fire alarm system comprises a control panel 13 and a plurality of combined smoke detectors and sounders 10 connected to a wire extending from the control panel 13. Each detector 10 is arranged to change from a standby condition to an alarm condition when activated by smoke, however the control panel 13 is only arranged to trigger the sounders 10 when the activated detector 10 has changed from its standby condition to the alarm condition at least twice within a predetermined time period. In use, if the detector 10 was activated by smoke eg. from cooking, the smoke will diffuse quickly and the detector will not be activated again, and the sounders will not be triggered. However, if there is a real fire, the detector will be reactivated immediately and the sounders will be triggered. <IMAGE>

Description

  • This invention relates to a fire alarm system of the type disclosed in US 4 568 924 comprising a control panel and a plurality of remote smoke detectors connected to the control panel, each detector being arranged to change from a standby condition to an alarm condition when activated by smoke, the control panel being arranged to trigger an alarm signal only when the same detector has changed from its standby condition to the alarm condition at least twice within a predetermined time period.
  • In use, the control panel is triggered to emit an audible warning signal and perhaps alert the emergency services when one or more of the smoke detectors changes from a standby condition to an alarm condition when smoke is detected.
  • It is a requirement in many countries that flats or apartments, tenements, bedsitters and halls of residence etc. are fitted with a fire alarm system of the above-mentioned type.
  • It is common for each flat etc. to have some kind of cooking facility and we have found that many false alarms are triggered when toast is burnt or when smoke is inadvertently created whilst cooking. These false alarms are annoying to the occupants of other flats connected to the system. Furthermore, if the emergency services are called to attendance, there could be a charge imposed for the unnecessary call out.
  • I have now devised a fire alarm system which alleviates the above-mentioned problems.
  • In accordance with this invention there is provided a fire alarm system of the type disclosed in US 4 568 924 which is characterised in that whenever a detector changes from a standby condition to an alarm condition, a sounder associated therewith is energised to produce an audible output.
  • In use, if smoke is sensed in one of the flats connected to the alarm system, the smoke detector in the flat will change from its standby condition to an alarm condition, whereupon the sounder associated therewith provides a localised warning that its associated detector has been activated, so that the occupant can take steps to clear the smoke before the detector is activated again and the alarm condition is triggered.
  • Preferably the control panel is arranged to reset an activated detector to said standby condition at least once. If the detector was activated by smoke from cooking or from burnt toast, the smoke will diffuse quickly and the detector will not be activated again, and the alarm will not be triggered.
  • However, if there is a real fire, the detector will be reactivated immediately and the alarm will be triggered.
  • Preferably, the control panel is arranged to reset an activated detector, a predetermined time period after it has been activated. The time period is preferably sufficiently long to allow the smoke from a false alarm to diffuse before the alarm is reset.
  • Preferably the time period is adjustable.
  • Preferably, the number of successive times that each detector has to be activated before the alarm signal is triggered is adjustable.
  • Preferably the control panel is arranged to silence the sounder in the event that its associated detector is not activated again within said predetermined time period.
  • Preferably the control panel is arranged to trigger an alarm signal, when two different detectors are activated by smoke, signalling that the fire is spreading.
  • An embodiment of this invention will now be described by way of example only and with reference to the accompanying drawing, the single figure of which is a schematic diagram of a fire alarm system in accordance with this invention.
  • Referring to the drawing, there is shown a fire alarm system comprising a control panel 13, which is connected to an alarm circuit consisting of two zones 17, 18.
  • Each zone comprises a plurality of combined detector and sounder devices 10 connected in parallel across a pair of wires 11, 12 extending from the control panel 13. A plurality of manual call points 14 are also connected in parallel across the wires 11, 12.
  • Each detector/sounder device 10 comprises a heat sensor and a smoke sensor, say of the optical-scatter type.
  • The system may be installed in a house, which is divided into a plurality of self-contained flats, with the control panel 13 being located in the entrance hall and one or more detector/sounder devices 10 located in each flat.
  • In the past, whenever smoke is detected by one of the devices 10, the control panel is triggered to energise the sounder in each device 10, so as to provide an audible indication that there is a fire.
  • A disadvantage of this arrangement, is that smoke is often created whilst cooking, say when toast is burnt and this smoke can trigger an alarm condition, which causes annoyance to the occupant of each flat, especially if it is a common occurrence.
  • The alarm system in accordance with this invention alleviates this problem, as will be explained.
  • When a detector/sounder device 10 detects smoke, it changes from its Standby Mode to an Alarm Mode, wherein it latches into a condition in which an alarm signal is applied to the wires 11, 12. The sounder in the device 10 is also activated to produce an audible alarm signal.
  • The control panel 13 detects the alarm signal and after a period of 5-10 seconds, the control panel sends signal along the wires 11, 12 to rest the activated detector/sounder device 10 back into its Standby Mode.
  • If the detector/sounder device 10 was triggered by smoke from cooking, the smoke will disperse quickly and the detector/sounder device 10 will not be reactivated.
  • If smoke is still present, the detector/sounder device 10 will be reactivated immediately. The control panel 13 is programmed to send a signal to energise each of the sounders in the devices 10 only when any particular detector/sounder device 10 has been activated at least twice within a predetermined time period, although the control panel 13 preferably resets the activated detector/sounder device 10 several times before energising the sounders, in order to make allow time for smoke from cooking to disperse.
  • In this manner, the sounders are only energised to produce an audible warning signal when a detector is activated on say three successive occasions over a 30 second period, thereby indicating that smoke is persisting in the room and that a real fire must have broken out.
  • Smoke from cooking diffuses quickly and is unlikely to persist around the detector for 30 seconds. Thus, the detector will not be re-activated on the second or third occasion that it is reset and thus the sounders are not activated.
  • The number of times which the detector/sounder devices 10 are reset is preferably adjustable and time between activation and resetting is preferably also adjustable.

Claims (7)

  1. A fire alarm system comprising a control panel and a plurality of remote smoke detectors (10) connected to the control panel (13), each detector (10) being arranged to change from a standby condition to an alarm condition when activated by smoke, said control panel (13) being arranged to trigger an alarm signal only when the same detector (10) has changed from its standby condition to said alarm condition at least twice within a predetermined time period, characterised in that whenever a detector (10) changes from a standby condition to an alarm condition, a sounder associated therewith is energised to produce an audible output.
  2. A fire alarm system as claimed in claim 1, characterised in that the control panel (13) is arranged to reset an activated detector (10) to said standby condition at least once.
  3. A fire alarm system as claimed in claim 2, characterised in that the control panel (13) is arranged to reset an activated detector (10), a predetermined time period after it has been activated.
  4. A fire alarm system as claimed in claim 3, characterised in that the time period is adjustable.
  5. A fire alarm system as claimed in any preceding claim, characterised in that the number of successive times that each detector (10) has to be activated before the alarm signal is triggered is adjustable.
  6. A fire alarm system as claimed in any preceding claim, characterised in that the control panel (13) is arranged to silence the sounder in the event that its associated detector (10) is not activated again within said predetermined time period.
  7. A fire alarm system as claimed in any preceding claim, characterised in that the control panel (13) is arranged to trigger an alarm signal, when two different detectors (10) are activated by smoke.
EP00301624A 1999-03-12 2000-02-29 Fire alarm system Revoked EP1035528B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9905588A GB2347772B (en) 1999-03-12 1999-03-12 Fire alarm system
GB9905588 1999-03-12

Publications (3)

Publication Number Publication Date
EP1035528A2 EP1035528A2 (en) 2000-09-13
EP1035528A3 EP1035528A3 (en) 2001-03-07
EP1035528B1 true EP1035528B1 (en) 2003-06-18

Family

ID=10849413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00301624A Revoked EP1035528B1 (en) 1999-03-12 2000-02-29 Fire alarm system

Country Status (5)

Country Link
EP (1) EP1035528B1 (en)
AT (1) ATE243355T1 (en)
DE (1) DE60003351T2 (en)
GB (1) GB2347772B (en)
PT (1) PT1035528E (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0509955D0 (en) * 2005-05-14 2005-06-22 Rafiki Holdings Ltd Fire alarm system
DE102011006470B4 (en) * 2011-03-31 2016-07-28 Siemens Aktiengesellschaft Combined fire detection and control device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1052399A (en) * 1963-06-21
JPS59201193A (en) * 1983-04-30 1984-11-14 松下電工株式会社 Fire alarm system
DE3467267D1 (en) * 1983-10-17 1987-12-10 Cerberus Ag Alarm signalling method and application device therefor
GB8531002D0 (en) * 1985-12-17 1986-01-29 Weyrad Electronics Ltd Alarm systems
US4808972A (en) * 1986-05-29 1989-02-28 Cadin Electronics Pty. Ltd. Security system with false alarm inhibiting

Also Published As

Publication number Publication date
EP1035528A2 (en) 2000-09-13
DE60003351T2 (en) 2004-04-29
PT1035528E (en) 2003-11-28
EP1035528A3 (en) 2001-03-07
GB2347772A (en) 2000-09-13
GB9905588D0 (en) 1999-05-05
DE60003351D1 (en) 2003-07-24
GB2347772B (en) 2003-05-07
ATE243355T1 (en) 2003-07-15

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