EP0345798B1 - Brandmeldeanlage - Google Patents

Brandmeldeanlage Download PDF

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Publication number
EP0345798B1
EP0345798B1 EP89110449A EP89110449A EP0345798B1 EP 0345798 B1 EP0345798 B1 EP 0345798B1 EP 89110449 A EP89110449 A EP 89110449A EP 89110449 A EP89110449 A EP 89110449A EP 0345798 B1 EP0345798 B1 EP 0345798B1
Authority
EP
European Patent Office
Prior art keywords
fire
sensor
alarm system
detector
fire alarm
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.)
Expired - Lifetime
Application number
EP89110449A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0345798A1 (de
Inventor
Hannes Güttinger
Mark Jäggi
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Publication of EP0345798A1 publication Critical patent/EP0345798A1/de
Application granted granted Critical
Publication of EP0345798B1 publication Critical patent/EP0345798B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion

Definitions

  • the invention relates to a fire alarm system according to the preamble of claim 1.
  • fire alarm systems are generally known.
  • a gas and fire alarm system is described in CH-A-629'905, in which fire alarms are connected to a signaling center via lines, the fire alarms having threshold values for the fire phenomena to be detected, when exceeded, an alarm signal is forwarded to a signaling center.
  • the object of the present invention is to provide a fire alarm system which avoids the disadvantages of the known fire alarm systems and which in particular reduces the susceptibility to false alarms of known fire alarm systems, without impairing the security of the detection of real alarm situations.
  • the switching elements for linking the output signals of the fire sensors can either be arranged in a fire detector or they can be provided in a signal center. Separate switching devices can also be provided for partial areas, for example larger halls or halls.
  • the fire alarm system according to the invention has the significant advantage that, in the presence of people, the sensitivity of the fire detectors can be reduced without reducing security, since people can not only be the cause of false alarms, but can also reliably differentiate between disturbance variables and real alarm situations. Since the false alarm rate strongly depends on the response behavior of the fire detectors, a significant reduction in the false alarm rate can be achieved by changing the response behavior.
  • the fire alarm system according to the invention has the further advantage that even static sources of interference as the cause of false alarms can be switched off.
  • the output signal of the acoustic sensor can be filtered by frequency analysis and a more reliable decision can be made.
  • the fire sensor consists of an ionization chamber and the acoustic sensor consists of a microphone.
  • the acoustic sensor is structurally connected to the fire detector, wherein it is preferably arranged in the housing of the fire detector, in its base or on one of these parts.
  • the acoustic sensor is arranged spatially separate from the fire detector, an acoustic sensor being provided for controlling the sensitivity of one or more fire detectors.
  • the fire alarm system can also be designed in such a way that a plurality of acoustic sensors are provided for controlling the sensitivity of a fire alarm, it also being possible for a plurality of acoustic sensors to control a group of fire detectors.
  • the switching elements for changing the sensitivity of the fire detectors are designed so that either the output signal of the fire detector is influenced or that the response threshold of the threshold value detector is changed.
  • the switching elements for changing the sensitivity of the fire detectors can preferably be designed such that, after a fire detector has responded, all fire detectors of the same group are switched to full sensitivity.
  • FIG. 1 shows a block diagram of the circuitry of a fire alarm system according to the invention.
  • the fire alarm system consists of an ionization smoke detector BM, an acoustic sensor 10 and a signaling center SZ connected to the smoke detector BM via lines.
  • the fire sensor 12 of the fire detector BM works according to the ionization principle, and a microphone is used as the acoustic sensor 10.
  • the sensor 12 of the ionization smoke detector BM consists of a measuring chamber KM, in which the air is made electrically conductive (ionized) by a radiation source, and a reference chamber KR, which is connected in series with the measuring chamber KM; both chambers form a voltage divider, which is connected to the operating voltage UB via the matching resistor 9.
  • the reference chamber KR is closed, while the measuring chamber KM is accessible to the room air to be monitored.
  • the connection point VP of the voltage divider is connected to a first impedance converter 1, the output signal of which is fed to the threshold value detector 2.
  • the threshold value detector 2 in turn is functionally connected to a flip-flop 3, which may generate an alarm signal.
  • a trigger circuit 3 is triggered via the first impedance converter 1 and the threshold value detector 2, whereby an alarm is triggered.
  • An acoustic is used to control the sensitivity of the fire detector BM Sensor 10, whose output signal is amplified by a second impedance converter 11 and fed to the threshold detector 2.
  • the threshold value detector 2 is designed in such a way that it raises the response threshold for triggering an alarm if the output signal of the second impedance converter 11 connected to the acoustic sensor 11 exceeds a certain value, that is to say the occurrence of a disturbance variable, for example the presence of a person or the switching on of a Machine or the like.
  • An electrical function check and a check of the response sensitivity of the fire detector BM is possible via the measuring point MP3.
  • the voltage between the measuring points MP1 and MP3 can be measured via the matching resistor 9.
  • KR By changing the resistance value of the matching resistor 9, a change in the voltage at the connection point of the chambers KM, KR can be achieved, as a result of which the electrical sensitivity of the fire detector BM is changed. This makes it possible to adapt the sensitivity of the BM fire detectors to special environmental conditions, such as the presence of people, vehicle traffic, etc.
  • a fire detection system in which the signals from the fire sensor KM and the acoustic sensor 10 are linked in switching elements which are arranged in the fire detector BM.
  • the acoustic sensor 10 can be integrated in the fire detector BM, or it can be arranged spatially separate from the fire detector (s).
  • the figure does not show a further design option for the fire alarm system according to the invention, in which the output signals of the fire detectors BM and the acoustic sensors 10 are linked in the signal center.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
EP89110449A 1988-06-10 1989-06-09 Brandmeldeanlage Expired - Lifetime EP0345798B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2242/88A CH677413A5 (enrdf_load_stackoverflow) 1988-06-10 1988-06-10
CH2242/88 1988-06-10

Publications (2)

Publication Number Publication Date
EP0345798A1 EP0345798A1 (de) 1989-12-13
EP0345798B1 true EP0345798B1 (de) 1994-07-27

Family

ID=4229180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89110449A Expired - Lifetime EP0345798B1 (de) 1988-06-10 1989-06-09 Brandmeldeanlage

Country Status (7)

Country Link
US (1) US4975684A (enrdf_load_stackoverflow)
EP (1) EP0345798B1 (enrdf_load_stackoverflow)
AT (1) ATE109294T1 (enrdf_load_stackoverflow)
CA (1) CA1316234C (enrdf_load_stackoverflow)
CH (1) CH677413A5 (enrdf_load_stackoverflow)
DE (1) DE58908097D1 (enrdf_load_stackoverflow)
NO (1) NO174126C (enrdf_load_stackoverflow)

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DE69026014T2 (de) * 1989-01-25 1996-10-17 Nohmi Bosai Ltd Feueralarmsystem
US5084696A (en) * 1991-01-24 1992-01-28 Aritech Corporation Signal detection system with dynamically adjustable detection threshold
US5483222A (en) * 1993-11-15 1996-01-09 Pittway Corporation Multiple sensor apparatus and method
US5627515A (en) * 1995-02-24 1997-05-06 Pittway Corporation Alarm system with multiple cooperating sensors
AU701191B2 (en) * 1995-08-18 1999-01-21 Ge Infrastructure Security Pty Ltd Fire detection system
US5726633A (en) * 1995-09-29 1998-03-10 Pittway Corporation Apparatus and method for discrimination of fire types
US5920259A (en) * 1997-11-10 1999-07-06 Shmuel Hershkovitz Motion detection with RFI/EMI protection
US6229439B1 (en) 1998-07-22 2001-05-08 Pittway Corporation System and method of filtering
US6222456B1 (en) 1998-10-01 2001-04-24 Pittway Corporation Detector with variable sample rate
EP1124210B1 (de) * 2000-02-11 2008-04-09 Siemens Aktiengesellschaft Brandmeldesystem und Brandmelder für dieses
US6753786B1 (en) 2000-08-11 2004-06-22 Walter Kidde Portable Equipment, Inc. Microprocessor-based combination smoke and carbon monoxide detector having intelligent hush feature
US6850788B2 (en) 2002-03-25 2005-02-01 Masimo Corporation Physiological measurement communications adapter
US20040002724A1 (en) * 2002-05-23 2004-01-01 Falahee Mark H. Navigable trocar with safety tip
US7221260B2 (en) * 2003-11-21 2007-05-22 Honeywell International, Inc. Multi-sensor fire detectors with audio sensors and systems thereof
US7327247B2 (en) * 2004-11-23 2008-02-05 Honeywell International, Inc. Fire detection system and method using multiple sensors
US7804402B2 (en) * 2007-01-26 2010-09-28 Honeywell International Inc. Fire detectors with environmental data input
US7642924B2 (en) * 2007-03-02 2010-01-05 Walter Kidde Portable Equipment, Inc. Alarm with CO and smoke sensors
US8508356B2 (en) * 2009-02-18 2013-08-13 Gary Stephen Shuster Sound or radiation triggered locating device with activity sensor
US10032002B2 (en) 2009-03-04 2018-07-24 Masimo Corporation Medical monitoring system
US10007758B2 (en) 2009-03-04 2018-06-26 Masimo Corporation Medical monitoring system
US9323894B2 (en) 2011-08-19 2016-04-26 Masimo Corporation Health care sanitation monitoring system
US9218454B2 (en) 2009-03-04 2015-12-22 Masimo Corporation Medical monitoring system
US8754775B2 (en) 2009-03-20 2014-06-17 Nest Labs, Inc. Use of optical reflectance proximity detector for nuisance mitigation in smoke alarms
US9724024B2 (en) 2010-03-01 2017-08-08 Masimo Corporation Adaptive alarm system
JP2012159985A (ja) * 2011-01-31 2012-08-23 Panasonic Corp 設備機器制御システム
FR3017232B1 (fr) * 2014-02-03 2017-09-01 Finsecur Boitier de securisation d'un local, systemes de securisation et de commande d'un local et procede de construction d'un mur
GB2537940B (en) * 2015-05-01 2018-02-14 Thorn Security Fire detector drift compensation

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US3594751A (en) * 1968-02-29 1971-07-20 Brk Electronics Detection of products of combustion
CH506147A (de) * 1968-02-29 1971-04-15 Brk Electronics Elektrische Branddetektoreinrichtung
USRE28915E (en) * 1968-02-29 1976-07-20 BRK Shareholders' Committee Detection of products of combustion
US3548205A (en) * 1968-08-08 1970-12-15 Brk Electronics Warning device
US3611335A (en) * 1968-11-13 1971-10-05 Bbk Electronics Inc Multiple combustion sensing device with false alarm prevention
US3713128A (en) * 1970-08-07 1973-01-23 Systron Donner Corp Vault alarm system and method
US3838408A (en) * 1973-02-09 1974-09-24 Detection Syst Inc Environmental test switch for intruder detection systems
CH572252A5 (enrdf_load_stackoverflow) * 1973-11-09 1976-01-30 Nohmi Bosai Kogyo Co Ltd
US4195234A (en) * 1978-02-02 1980-03-25 Optical Coating Laboratory, Inc. Infrared intrusion alarm system with temperature responsive threshold level
CH629905A5 (de) * 1978-07-17 1982-05-14 Cerberus Ag Gas- und/oder brandmeldeanlage.
AU5026479A (en) * 1978-08-26 1980-03-06 Hochiki Corp. Fire sensing system
DE2937686A1 (de) * 1979-02-21 1980-09-11 Gamewell Corp Kombinationsdetektor
US4313110A (en) * 1980-02-19 1982-01-26 Thomas Subulak Smoke alarm having temporary disabling features
JPS56132690A (en) * 1980-03-19 1981-10-17 Hochiki Co Fire detector
FR2485773A1 (fr) * 1980-06-24 1981-12-31 Promocab Systeme de protection d'une zone contre l'agression humaine
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JPS59173898A (ja) * 1983-03-23 1984-10-02 能美防災株式会社 家庭用などの火災報知機
JPS6081698A (ja) * 1983-10-07 1985-05-09 東京電力株式会社 電磁波を用いた監視および指令誘導システム
US4691196A (en) * 1984-03-23 1987-09-01 Santa Barbara Research Center Dual spectrum frequency responding fire sensor
JPS62269293A (ja) * 1986-05-19 1987-11-21 石井　弘允 火災報知装置
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US4814748A (en) * 1987-11-09 1989-03-21 Southwest Laboratories, Inc. Temporary desensitization technique for smoke alarms

Also Published As

Publication number Publication date
CH677413A5 (enrdf_load_stackoverflow) 1991-05-15
DE58908097D1 (de) 1994-09-01
NO892389D0 (no) 1989-06-09
NO892389L (no) 1989-12-11
US4975684A (en) 1990-12-04
NO174126B (no) 1993-12-06
EP0345798A1 (de) 1989-12-13
ATE109294T1 (de) 1994-08-15
CA1316234C (en) 1993-04-13
NO174126C (no) 1994-03-16

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