EP0418411A1 - Système d'avertissement d'incendie avec un avertisseur combiné - Google Patents

Système d'avertissement d'incendie avec un avertisseur combiné Download PDF

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Publication number
EP0418411A1
EP0418411A1 EP89117329A EP89117329A EP0418411A1 EP 0418411 A1 EP0418411 A1 EP 0418411A1 EP 89117329 A EP89117329 A EP 89117329A EP 89117329 A EP89117329 A EP 89117329A EP 0418411 A1 EP0418411 A1 EP 0418411A1
Authority
EP
European Patent Office
Prior art keywords
fire
temperature
measured
stored
humidity
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.)
Granted
Application number
EP89117329A
Other languages
German (de)
English (en)
Other versions
EP0418411B1 (fr
Inventor
Helfried Dipl.-Ing. Lappe
Otfried Dipl.-Ing. Post
Peer Dr.-Ing. Thilo
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to DE89117329T priority Critical patent/DE58907131D1/de
Priority to AT89117329T priority patent/ATE102374T1/de
Priority to EP89117329A priority patent/EP0418411B1/fr
Priority to ES89117329T priority patent/ES2049787T3/es
Publication of EP0418411A1 publication Critical patent/EP0418411A1/fr
Application granted granted Critical
Publication of EP0418411B1 publication Critical patent/EP0418411B1/fr
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
    • 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
    • G08B29/183—Single detectors using dual technologies
    • 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
    • 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
    • G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds

Definitions

  • the invention relates to a fire alarm system with a fire alarm center, primary alarm lines and connected smoke detectors, which record different fire parameters, with a smoke sensor the smoke density and with a temperature sensor the heat or temperature is measured and stored for further processing.
  • a physical fire parameter either smoke or temperature
  • a physical fire parameter is generally used for the early detection of damage fires for alarm detection. This can more easily lead to malfunctions or deceptions, for example caused by cigarette smoke.
  • the parameter under consideration does not change or changes only slightly. For example, when burning alcohol, a liquid fire, no aerosol formation, i.e. no smoke occurs, a smoke detector does not respond. A heat detector would recognize such a combustion process, but relatively late.
  • liquid fires such as alcohol
  • the temperature change is not always detected early, ie quickly enough.
  • the object of the invention is therefore to detect damage fire early and reliably with the aid of multi-criteria detectors and to take into account the water vapor formation that occurs.
  • a fire sensor is additionally arranged in the fire alarm, with which the relative atmospheric humidity is measured and temporarily stored
  • a microcomputer and at least one read-only memory in which the water vapor saturation curve is stored are provided by means of of the microcomputer and the stored data of the saturation curve from the measured temperature and the measured relative air humidity
  • the absolute air humidity is calculated and stored as a new and additional fire parameter, namely absolute humidity, for further processing
  • the three fire parameters smoke density, temperature and absolute humidity, about a linking device can be related in such a way that fire alarm criteria for forming an alarm signal are derived from it.
  • the fire events described at the outset can be recognized at an early stage, for example if there is a rise in temperature and a simultaneous rapid increase in the absolute air humidity due to the combustion of a certain liquid, such as eg alcohol, can be recognized.
  • a certain liquid such as eg alcohol
  • the fire parameter smoke density is also advantageously recorded, and from the three fire parameters, namely also the additional fire parameter absolute humidity, by means of a suitable one, in a festival detection algorithms stored in the value memory form an early and safe alarm signal.
  • the calculation of the absolute air humidity and the linking of the various measured values to form an alarm signal can either take place in a fire detector, which is designed as a combination detector, or else in the fire alarm center, with the individual detector measured values being periodically transmitted to the alarm center.
  • FIG. 1 shows the measured value curve for the fire parameters temperature T, absolute humidity AF and smoke density RD of an optical smoke detector over a time axis.
  • the same scale factors are used for the measurement axis for all drawings.
  • the time axis is based on 14 minutes. It can be seen very clearly here that the three fire parameters increase relatively evenly.
  • FIG. 1 A typical cigarette fire over a time axis of 25 minutes is shown in FIG.
  • Fig. 4 a spirit fire is now shown over the time axis of thirty minutes. Here you can see very clearly that this fire has a very strong part in the temperature increase T and a very strong part in the increase in the absolute humidity AF. The percentage of smoke density RD is negligible.
  • the fire characteristic curve when boiling water is shown in Fig. 5.
  • the timeline is 90 minutes long.
  • a high proportion of the absolute humidity AF can be seen.
  • a small amount of heat can also be seen in the course of the measured temperature T.
  • a very sensitive heat detector could possibly trigger a false alarm, but this can be prevented here with a multi-criteria detector according to the invention if an extremely strong course of the absolute humidity is detected in relation to the weak temperature course.
  • the three fire parameters smoke density, temperature and absolute air humidity are taken into account in the fire alarm system according to the invention.
  • the acquisition of the measured values and the processing expediently take place with an intelligent, microprocessor-supported combination detector which periodically records these values.
  • the smoke density is measured according to the principle of optical backscattering and a measurement value for the smoke density is made available for further processing with a downstream electronic circuit.
  • the moisture sensor for detecting the relative air humidity is expediently formed by a capacitance which generates a frequency-analog signal with the aid of an oscillator circuit.
  • the downstream microcomputer measures this frequency with a quartz-controlled time base counter and uses this to determine the value of the relative air humidity from a linearization table which is stored in a read-only memory.
  • the sensor for the ambient temperature can be formed by a temperature-dependent resistor, for example an NTC resistor (thermistor), which uses a second oscillator circuit to generate a second frequency-analog signal.
  • the microcomputer measures this frequency with a quartz-controlled time base counter and uses this to determine the value of the ambient temperature using a second linearization table.
  • the absolute humidity is calculated using the water vapor saturation curve, which e.g. is in the form of a table.
  • the corresponding maximum possible water content is assigned to the corresponding temperature.
  • the instantaneous absolute humidity is multiplied by the relative humidity.
  • the absolute humidity is determined in the combination detector. This measured value of the absolute humidity is linked to the determined temperature and smoke density measured values with the aid of a detection algorithm located in the combination detector to form an alarm signal which is output to the fire alarm control panel.
  • the absolute humidity can be calculated and the alarm signal can be generated in the fire alarm control panel itself.
  • the combination detector transmits its periodically determined measured values of the relative humidity, the temperature and the smoke density to the fire alarm control panel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
EP89117329A 1989-09-19 1989-09-19 Système d'avertissement d'incendie avec un avertisseur combiné Expired - Lifetime EP0418411B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE89117329T DE58907131D1 (de) 1989-09-19 1989-09-19 Brandmeldeanlage mit einem Kombinationsmelder.
AT89117329T ATE102374T1 (de) 1989-09-19 1989-09-19 Brandmeldeanlage mit einem kombinationsmelder.
EP89117329A EP0418411B1 (fr) 1989-09-19 1989-09-19 Système d'avertissement d'incendie avec un avertisseur combiné
ES89117329T ES2049787T3 (es) 1989-09-19 1989-09-19 Instalacion de aviso de incendio con un avisador combinado.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89117329A EP0418411B1 (fr) 1989-09-19 1989-09-19 Système d'avertissement d'incendie avec un avertisseur combiné

Publications (2)

Publication Number Publication Date
EP0418411A1 true EP0418411A1 (fr) 1991-03-27
EP0418411B1 EP0418411B1 (fr) 1994-03-02

Family

ID=8201907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117329A Expired - Lifetime EP0418411B1 (fr) 1989-09-19 1989-09-19 Système d'avertissement d'incendie avec un avertisseur combiné

Country Status (4)

Country Link
EP (1) EP0418411B1 (fr)
AT (1) ATE102374T1 (fr)
DE (1) DE58907131D1 (fr)
ES (1) ES2049787T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021208A1 (fr) * 1995-01-04 1996-07-11 Caradon Gent Limited Perfectionnements apportes a des detecteurs de fumee ou s'y rapportant
EP0729123A1 (fr) * 1995-02-21 1996-08-28 Pittway Corporation Appareil avec un détecteur d'incendie et un détecteur sensible aux autres conditions
EP1596349A1 (fr) * 2004-05-13 2005-11-16 Job Lizenz GmbH & Co. KG Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée
EP1732049A1 (fr) * 2005-06-10 2006-12-13 Siemens S.A.S. Détecteur de feux ou de fumée à haute rejection de fausses alarmes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125485A1 (fr) * 1983-04-12 1984-11-21 Siemens Aktiengesellschaft Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée
DE3337330A1 (de) * 1983-10-13 1985-04-25 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur analogen messwertuebertragung der jeweiligen brandkenngroessen eines mehrkriterien-brandmelders
EP0140502A1 (fr) * 1983-08-12 1985-05-08 Martin Terence Cole Appareil pour la détection de fumée
GB2175392A (en) * 1985-04-26 1986-11-26 Hochiki Co Output correction system for analogue sensor
GB2190777A (en) * 1986-05-19 1987-11-25 Hochiki Co Fire alarm system, sensor and method of fire alarm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125485A1 (fr) * 1983-04-12 1984-11-21 Siemens Aktiengesellschaft Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée
EP0140502A1 (fr) * 1983-08-12 1985-05-08 Martin Terence Cole Appareil pour la détection de fumée
DE3337330A1 (de) * 1983-10-13 1985-04-25 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur analogen messwertuebertragung der jeweiligen brandkenngroessen eines mehrkriterien-brandmelders
GB2175392A (en) * 1985-04-26 1986-11-26 Hochiki Co Output correction system for analogue sensor
GB2190777A (en) * 1986-05-19 1987-11-25 Hochiki Co Fire alarm system, sensor and method of fire alarm

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 16, Nr. 237 (P-157), 25. November 1982; & JP-A-57 136 154 (MATSUSHITA DENKI SANGYO K.K.) 23-08-1982 *
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 157 (P-369), 2. Juli 1985; & JP-A-60 033 035 (HOCHIKI K.K.) 02-02-1985 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021208A1 (fr) * 1995-01-04 1996-07-11 Caradon Gent Limited Perfectionnements apportes a des detecteurs de fumee ou s'y rapportant
EP0729123A1 (fr) * 1995-02-21 1996-08-28 Pittway Corporation Appareil avec un détecteur d'incendie et un détecteur sensible aux autres conditions
EP1596349A1 (fr) * 2004-05-13 2005-11-16 Job Lizenz GmbH & Co. KG Méthode pour la détection et l'annoncer de la condensation dans des détecteurs de fumée
EP1732049A1 (fr) * 2005-06-10 2006-12-13 Siemens S.A.S. Détecteur de feux ou de fumée à haute rejection de fausses alarmes
WO2006131204A1 (fr) * 2005-06-10 2006-12-14 Siemens S.A.S. Detecteur d'incendie ou de fumee a hautes capacites de rejet des fausses alarmes
US7760102B2 (en) 2005-06-10 2010-07-20 Siemens Ag Fire or smoke detector with high false alarm rejection performance

Also Published As

Publication number Publication date
EP0418411B1 (fr) 1994-03-02
ATE102374T1 (de) 1994-03-15
DE58907131D1 (de) 1994-04-07
ES2049787T3 (es) 1994-05-01

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