EP0696787A1 - Dispositif et méthode de détection d'incendie à compensation de la pression d'air - Google Patents

Dispositif et méthode de détection d'incendie à compensation de la pression d'air Download PDF

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Publication number
EP0696787A1
EP0696787A1 EP95112411A EP95112411A EP0696787A1 EP 0696787 A1 EP0696787 A1 EP 0696787A1 EP 95112411 A EP95112411 A EP 95112411A EP 95112411 A EP95112411 A EP 95112411A EP 0696787 A1 EP0696787 A1 EP 0696787A1
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EP
European Patent Office
Prior art keywords
air
output signal
sensor
pressure
air flow
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
EP95112411A
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German (de)
English (en)
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EP0696787B1 (fr
Inventor
Ernst-Werner Wagner
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.)
Wagner Alarm- und Sicherungssysteme GmbH
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Wagner Alarm- und Sicherungssysteme GmbH
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Publication of EP0696787A1 publication Critical patent/EP0696787A1/fr
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Publication of EP0696787B1 publication Critical patent/EP0696787B1/fr
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    • 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
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means

Definitions

  • the present invention relates to a method for detecting fires and gases in rooms or in electrical or electronic devices, in which a representative volume fraction of the room air or the cooling air flow of the device is tapped and fed to a measuring chamber with at least one detector for detecting a fire parameter, and in which the mass flow of the supplied air is monitored for changes.
  • the present invention further relates to a fire detection device for carrying out the above method, with a detector for detecting a fire parameter, to which a representative volume fraction of room or device air is supplied, and with an air flow sensor, with which the mass flow of the supplied air is monitored for changes.
  • Fire or gas detection devices are also known, for example, under the technical term "facility protection systems". Typical areas of application for fire or gas detection devices are EDP systems and in particular individual components thereof, and similar electronic devices, such as, for example, measuring, control and regulating systems, switching devices and private branch exchanges and the like.
  • the term "fire parameter" is understood to mean physical parameters which are subject to measurable changes in the vicinity of an incipient fire, e.g. the ambient temperature, the proportion of solid or liquid or gas in the ambient air (formation of smoke in the form of particles or aerosols, or steam) or the ambient radiation.
  • a fire or gas detection device to which the present invention relates branches off a representative part of the device cooling air via a pipe or duct system or actively draws in room or device air at certain points, and then guides this representative part of the measuring chamber with the detector to record a fire parameter.
  • the suction pipes are for sucking in the room or device air or ducts with suction openings.
  • thermal air flow sensors are usually used, in which the cooling of a heated sensor element is the measure of the air flow. This cooling depends on how many air molecules flow past the heated sensor element per unit of time. The output signal of the thermal air flow sensor is thus a measure of the mass flow ⁇ .
  • the air flow sensor monitors the mass flow within a bandwidth between an upper threshold and a lower threshold.
  • experience has shown that the output signal of the airflow sensor was also exposed to fluctuations in air pressure fluctuations or temperature fluctuations, so that the output signal of the airflow sensor exceeded or fell below the predetermined threshold values without the presence of a real malfunction and to avoid this effect the bandwidth between the upper one and the lower threshold had to be increased.
  • this has the disadvantage that the sensitivity of the fire detection device could not be sensitive enough to detect changes in the amount of room or device air drawn in.
  • This object is achieved according to the invention in a method with the known method steps mentioned at the outset by compensating for pressure fluctuations acting on the tapped and supplied air, in particular the atmospheric air pressure.
  • a fire detection device for carrying out the method, which, in addition to the known features mentioned at the outset, has a pressure sensor whose output signal represents the pressure acting on the air supplied, and a first compensation device for compensating the output signal of the airflow sensor as a function of the output signal of the pressure sensor.
  • volume flow V ⁇ of the tapped representative partial air quantity or its flow velocity is of interest.
  • equation (III.) By inserting equation (III.) Into equation (I.), there is a dependency on what is measured by the airflow sensor Mass flow ⁇ from the temperature T L and from the pressure p that acts on the air.
  • the advantages of these solutions according to the invention are, in particular, that weather-related changes in air pressure which change the density of the representative air subset can be compensated for.
  • the advantage of the solutions according to the invention is particularly clear in the case of fire detection devices in mobile use, for example in a mountain locomotive or the like. There, the pressure differences are up to 300 hPa when there are large differences in height.
  • the more sensitive monitoring of a possible infarction of the outlet openings allows the monitoring area of a device to be enlarged, thereby achieving greater economic benefits.
  • the compensation is preferably carried out in that the output signal (actual value) of an air flow sensor for measuring the mass flow of the supplied air is corrected by the output signal of a pressure sensor.
  • a temperature sensor is accordingly provided, the output signal of which represents the temperature of the air supplied, and a second compensation device for compensating the output signal of the air flow sensor as a function of the output signal of the temperature sensor.
  • FIG. 2 shows a block diagram of a pressure-compensated air flow sensor in a fire detection device.
  • a fan 11 continuously sucks a representative volume fraction a room air or a cooling air flow of a bone and leads this to a measuring chamber (not shown) with a detector for detecting a fire parameter.
  • the air flow is monitored by a thermal air flow sensor 2 in accordance with the explanations for FIG. 1.
  • a pressure sensor 4 is provided which supplies a signal which is proportional to the absolute air pressure and which is fed to a first compensation device 6.
  • This first compensation device 6 also receives the output signal 9 of the air flow sensor.
  • the output signal 9 of the air flow sensor 2 is corrected. This compensates for the influence of the changes in air density by the air pressure both on the intake power of the fan and on the mass flow ⁇ flowing through the air flow sensor 2.
  • a temperature sensor 10 is used to compensate for the influence of temperature on the air density.
  • the output signal of the temperature sensor 10 is fed to a second compensation device 8, which receives the output signal of the first compensation device 6 as a further input signal.
  • the temperature influence on the suction power of the fan 11 and on the air flow and pressure sensors can thus be corrected.
  • the double-compensated output signal of the second compensation device 8 is first fed to an amplifier 12 and then to a matching device 13 and finally to a comparator 14.
  • the comparator 14 receives the upper threshold value 1 and the lower threshold value 3 as comparison values at two further inputs.
  • the output signal of the balancing device 13 is greater than the upper threshold value 1, there is probably a break in the intake system; If the output signal of the adjustment device 13 is less than the lower threshold value 3, there is probably a blockage in the intake system or a fan failure.
  • the area 21 of the block diagram according to FIG. 2 represents a possible further processing of the double-compensated air flow sensor signal 9.
  • Reference numeral 15 denotes the signal for a break in the intake system, and reference numeral 16 the signal for a possible blockage or fan failure.
  • These signals are fed via an OR gate 17 and a time delay element 18 to a fault display 19 and a switching relay 20 for further measures.
  • An airflow fault is indicated by the fault LED of the fault indicator 19 flashing. After a delay time that can be set via the time delay element 18 has elapsed, the display changes to a steady light and the message is forwarded via the fault relay 20 to a fire alarm control panel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Measuring Fluid Pressure (AREA)
EP95112411A 1994-08-12 1995-08-07 Dispositif et méthode de détection d'incendie avec détection d'un courant d'air à compensation de la pression d'air Expired - Lifetime EP0696787B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4428694A DE4428694C2 (de) 1994-08-12 1994-08-12 Luftdruckkompensierte Branderkennungsvorrichtung und Verfahren
DE4428694 1994-08-12

Publications (2)

Publication Number Publication Date
EP0696787A1 true EP0696787A1 (fr) 1996-02-14
EP0696787B1 EP0696787B1 (fr) 1999-06-16

Family

ID=6525604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112411A Expired - Lifetime EP0696787B1 (fr) 1994-08-12 1995-08-07 Dispositif et méthode de détection d'incendie avec détection d'un courant d'air à compensation de la pression d'air

Country Status (3)

Country Link
EP (1) EP0696787B1 (fr)
AT (1) ATE181438T1 (fr)
DE (2) DE4428694C2 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964378A1 (fr) * 1998-02-24 1999-12-15 F F SEELEY NOMINEES PTY. Ltd Détecteur d'incendie
EP1056062A2 (fr) * 1999-05-27 2000-11-29 Securiton AG Détecteur d'incendie
EP1638062A1 (fr) * 2004-09-09 2006-03-22 HEKATRON Technik GmbH Détecteur de fumée à aspiration et méthode de son fonctionnement
EP2407946A1 (fr) 2010-07-15 2012-01-18 Siemens Schweiz AG Détection d'encrassements et de ruptures dans un détecteur de fumées par aspiration (ASD)
EP3023953A1 (fr) * 2014-11-19 2016-05-25 Honeywell International Inc. Système et procédé de surveillance de flux d'air pour des environnements de flux d'air variable
EP4109429A1 (fr) 2021-06-21 2022-12-28 Carrier Corporation Fonctionnement d'un système de détecteur d'incendie à aspiration
USD990330S1 (en) 2021-06-01 2023-06-27 Honeywell International Inc. Detector housing
US11721189B2 (en) 2021-06-01 2023-08-08 Honeywell International Inc. Aspirating smoke detector device
US11761875B2 (en) 2021-06-01 2023-09-19 Honeywell International Inc. Adjusting for air flow temperature changes in an aspirating smoke detector
US11867532B2 (en) 2021-06-01 2024-01-09 Honeywell International Inc. Aspirating smoke detector packaging
US11900776B2 (en) 2021-06-01 2024-02-13 Honeywell International Inc. Lid of an aspirating smoke detector device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006055617A1 (de) * 2006-11-24 2008-05-29 Funa Gmbh Brandschutzsysteme für technische Anlagen
EP3907484B1 (fr) 2020-05-08 2023-08-30 Carrier Corporation Détection de fuite dans un système de détection de feu d'aspiration
US11605916B2 (en) 2021-06-01 2023-03-14 Honeywell International Inc. Sealed electrical connector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2551215A1 (fr) * 1983-08-30 1985-03-01 Securiton Ag Dispositif de surveillance de la vitesse du flux d'un gaz dans un canal
DE3109224C2 (de) 1981-03-05 1986-09-18 Auergesellschaft Gmbh, 1000 Berlin Schaltungsanordnung zum Nachweis von Gasanteilen in einer zu überwachenden Gasatmosphäre
EP0197371A1 (fr) 1985-03-20 1986-10-15 Siemens Aktiengesellschaft Agencement pour détecteur d'incendie avec un système d'aspiration
US4764758A (en) 1987-07-01 1988-08-16 Environment/One Corporation Incipient fire detector II
EP0418409A1 (fr) 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Procédé et dispositif pour éviter les influences climatiques de l'environnement sur les indicateurs automatiques d'incendie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3109224C2 (de) 1981-03-05 1986-09-18 Auergesellschaft Gmbh, 1000 Berlin Schaltungsanordnung zum Nachweis von Gasanteilen in einer zu überwachenden Gasatmosphäre
FR2551215A1 (fr) * 1983-08-30 1985-03-01 Securiton Ag Dispositif de surveillance de la vitesse du flux d'un gaz dans un canal
DE3331203A1 (de) 1983-08-30 1985-03-14 Securiton AG, Zollikofen, Bern Vorrichtung zur ueberwachung der geschwindigkeit eines gasstromes in einem kanal
EP0197371A1 (fr) 1985-03-20 1986-10-15 Siemens Aktiengesellschaft Agencement pour détecteur d'incendie avec un système d'aspiration
US4764758A (en) 1987-07-01 1988-08-16 Environment/One Corporation Incipient fire detector II
EP0418409A1 (fr) 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Procédé et dispositif pour éviter les influences climatiques de l'environnement sur les indicateurs automatiques d'incendie

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964378A1 (fr) * 1998-02-24 1999-12-15 F F SEELEY NOMINEES PTY. Ltd Détecteur d'incendie
EP1056062A2 (fr) * 1999-05-27 2000-11-29 Securiton AG Détecteur d'incendie
EP1056062A3 (fr) * 1999-05-27 2002-02-20 Securiton AG Détecteur d'incendie
EP1638062A1 (fr) * 2004-09-09 2006-03-22 HEKATRON Technik GmbH Détecteur de fumée à aspiration et méthode de son fonctionnement
EP2407946A1 (fr) 2010-07-15 2012-01-18 Siemens Schweiz AG Détection d'encrassements et de ruptures dans un détecteur de fumées par aspiration (ASD)
WO2012007434A1 (fr) 2010-07-15 2012-01-19 Siemens Schweiz Ag Détection d'obturations et d'interruptions dans un détecteur de fumée à aspiration
AU2011278441B2 (en) * 2010-07-15 2013-09-12 Siemens Schweiz Ag Detection of blockages and interruptions with an aspirating smoke detector (ASD)
US9134716B2 (en) 2010-07-15 2015-09-15 Siemens Schweiz Ag Detection of blockages and interruptions with an aspirating smoke detector (ASD)
EP3023953A1 (fr) * 2014-11-19 2016-05-25 Honeywell International Inc. Système et procédé de surveillance de flux d'air pour des environnements de flux d'air variable
US9959726B2 (en) 2014-11-19 2018-05-01 Honeywell International Inc. System and method of airflow monitoring for variable airflow environments
USD990330S1 (en) 2021-06-01 2023-06-27 Honeywell International Inc. Detector housing
US11721189B2 (en) 2021-06-01 2023-08-08 Honeywell International Inc. Aspirating smoke detector device
US11761875B2 (en) 2021-06-01 2023-09-19 Honeywell International Inc. Adjusting for air flow temperature changes in an aspirating smoke detector
US11867532B2 (en) 2021-06-01 2024-01-09 Honeywell International Inc. Aspirating smoke detector packaging
US11900776B2 (en) 2021-06-01 2024-02-13 Honeywell International Inc. Lid of an aspirating smoke detector device
EP4109429A1 (fr) 2021-06-21 2022-12-28 Carrier Corporation Fonctionnement d'un système de détecteur d'incendie à aspiration

Also Published As

Publication number Publication date
DE59506207D1 (de) 1999-07-22
DE4428694A1 (de) 1996-02-22
ATE181438T1 (de) 1999-07-15
EP0696787B1 (fr) 1999-06-16
DE4428694C2 (de) 1996-06-20

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