EP0772851B1 - Dispositif de detection d'incendie comportant un capteur analogique - Google Patents
Dispositif de detection d'incendie comportant un capteur analogique Download PDFInfo
- Publication number
- EP0772851B1 EP0772851B1 EP95926439A EP95926439A EP0772851B1 EP 0772851 B1 EP0772851 B1 EP 0772851B1 EP 95926439 A EP95926439 A EP 95926439A EP 95926439 A EP95926439 A EP 95926439A EP 0772851 B1 EP0772851 B1 EP 0772851B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- value
- reference value
- cpu
- fire
- 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
Links
Classifications
-
- 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
-
- 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
- the present invention relates to devices fire detection system with analog sensors.
- the invention relates to a alarm system with multiple fire detectors communicating with a remote alarm center, at least one of these fire detectors comprising, on the one hand, an electronic central unit and, on the other hand, a sensor of fire which measures a physical quantity whose variations indicate the existence of a fire, this sensor transmitting the central unit an analog electrical signal which has a value representative of said quantity physical, the central unit comprising means for measure the signal value at regular time intervals, and this central unit being designed to calculate a difference between this measured value and a value of signal reference and to send to the control panel an alarm signal representative of a fire if and only if this difference is greater than a prime predetermined threshold.
- the electrical signal analog received by the central unit of the fire detector is subject to parasitic variations independent of the existence or not of a fire.
- parasitic variations can be due to variations in ambient temperature or variations other ambient physical parameters.
- the fire sensor is an ion sensor
- variations in ambient pressure and humidity change the signal electric analog transmitted by the fire sensor to the central unit of the detector.
- the first predetermined threshold aforementioned is usually chosen large enough, so that these parasitic variations do not cause reactions nuisance alarm
- EP-A-70 449 discloses such a solution using numerous variable thresholds.
- the object of the present invention is in particular to remedy this drawback.
- a device for fire detection of the genre in question is basically characterized in that the reference value taken account for each new measurement of the signal value depends on at least some of the values of said signal previously measured by the central unit, and in that the first predetermined threshold is between 10% and 20% of the reference value of the signal.
- a detector 1 is connected to an alarm center 5 by through a pair 2 of conductors 3, 4 which extends between a first end 2a where the two conductors 3, 4 are connected respectively to two terminals 5a, 5b of the alarm center, and a second end 2b where the two conductors 3, 4 are connected to each other by a resistance R.
- detectors 1 are connected to the pair 2 of conductors along it.
- pairs 2 of conductors can be connected to the alarm center 5, on several pairs of terminals 5a, 5b of this alarm center.
- each pair of terminals 5a and 5b of the alarm center are connected in series with a generator voltage 11 and a resistor R0, so that a current i is generated in pair 2 of conductors.
- the two terminals of the resistor R0 are connected to the two inputs 9a and 9b of a voltage amplifier 9, whose output 9c is itself connected to an input analog 10a of a microprocessor 10, which thus receives a voltage representative of current i: in other words, the microprocessor 10 can indirectly measure current i.
- detector 1 is connected to the pair 2 of conductors by means of four terminals 3a, 3b, 4a, 4b, conductor 3 being connected on the one hand to terminal 3a and on the other hand at terminal 3b, and conductor 4 being connected on the one hand to terminal 4a and on the other hand to terminal 4b.
- terminals 3a and 3b are short-circuited to each other, as are the terminals 4a and 4b.
- the fire detector 1 includes a sensor 7 fire, including an ion sensor for detecting smoke, an optical smoke detection sensor, a sensor thermal, etc.
- Sensor 7 measures a physical quantity the variations of which indicate the existence of a fire.
- the fire detector 1 comprises also a microprocessor 6, which has an input analog 6a connected to sensor 7. Sensor 7 transmits to this input 6 has an analog electrical signal u, for example a voltage, which is representative of the magnitude physical measured by sensor 7, and which is therefore susceptible to indicate to microprocessor 6 the existence of a fire in the vicinity of the fire detector.
- a microprocessor 6 which has an input analog 6a connected to sensor 7.
- Sensor 7 transmits to this input 6 has an analog electrical signal u, for example a voltage, which is representative of the magnitude physical measured by sensor 7, and which is therefore susceptible to indicate to microprocessor 6 the existence of a fire in the vicinity of the fire detector.
- the microprocessor 6 also has an output 6b which is connected to the base of a transistor T whose emitter and the collector are connected in series with at least one resistance R1 between conductors 3 and 4.
- the microprocessor 6 of the detector alarm 1 measures the value of the voltage u it receives from sensor 7, at regular time intervals. These intervals for example could be between 3 and 10 seconds.
- the microprocessor 6 compares the measured value to a reference value u0 which depends on the values measured previously, and which can be constituted for example by the last measured value, or by a function of the last measured values, for example a weighted average of the n last measured values, n being an integer at least equal to 2.
- At least some of the values predetermined measured values which are taken into account for calculate the reference value u0 have been measured more half an hour or more than an hour before the comparison between u and u0.
- the microprocessor 6 activates the transistor T via its output 6b, by example for a period of one second, which constitutes a alarm signal indicating to the control panel 5 the existence of a fire.
- the threshold ⁇ 3 can be relatively small, so the fire detector 1 may exhibit optimal sensitivity without risk generating false alarms.
- the resistance R0 of the alarm center is traversed by a increased current i which increases for example from 5 to 20 mA by compared to normal.
- This variation of the current i crossing the resistance R0 is transmitted to the analog input 10a of the microprocessor 10 of the alarm center in the form of a voltage signal, so the microprocessor 10 can detecting the passage into alarm state of detector 1, and then trigger an alarm reaction such as operation a siren, the transmission of an alarm message to a monitoring station, etc.
- the microprocessor 10 of the central alarm 5 is designed to measure at time intervals regular, for example every 3 to 10 seconds the current i which crosses resistance R0, via the voltage it receives at its analog input 10a.
- the microprocessor 10 determines whether the current i indicates that one of the fire detectors 1 connected to the pair 2 of conductors is in alarm state, calculating the difference between the measured value of current i and a reference value i0, and determining if this difference is greater than or not above a predetermined threshold ⁇ 1 which may possibly have a different value depending on whether i is greater than or less than i0, and which can be example 10 to 20% of the reference value or who can be fixed at a determined electrical current for example between 3 and 15 mA.
- control panel 5 When the control panel 5 has determined that one of the detectors 1 is in the alarm state, it in turn emits a alarm signal which may be an audible signal, or which may be a phone call, or whatever.
- the microprocessor 6 of the detector 1 may have in memory an initial reference value U of the signal u, and be programmed to send a fault signal on pair 2 of conductors if the difference between the measured value of signal u and the reference value initial U is greater than a second predetermined threshold ⁇ 2 higher than the threshold ⁇ 3.
- the second predetermined threshold ⁇ 2 can be equal to example 50% of the initial reference value U, and it can possibly have a first value if the value measured u is less than the initial reference value U and a second value if the measured value u is greater to the initial reference value U.
- microprocessor 6 activates transistor T at by means of its output 6b, but by carrying the tension of the output 6b at a value different from the voltage taken by said output to generate an alarm signal, so that the increase in current i perceived by the microprocessor 10 of alarm center 5 is different from the increase in current that occurs when detector 1 has detected a fire.
- the microprocessor 10 of the alarm center 5 is then informed that one of the fire detector 1 of the pair 2 of conductors has a fault, so that the alarm center 5 can react accordingly, for example by transmitting a fault message to a monitoring station, Or other.
- the microprocessor 6 of the fire detector 1 when it detects a sensor fault 7 as indicated above, it can sequentially activate and deactivate transistor T so as to generate in the pair 2 of conductors a coded binary signal consisting of successive increases and decreases in current i, this coded binary signal being specific to detector 1.
- this alarm center 5 can identify the detector 1 which is in default.
- the output 6b of the microprocessor 6 could be an analog output to generate sinusoidal voltage, in which case the fault signal may be constituted by a frequency sent on the pair 2 of conductors and received by the microprocessor 10, this frequency preferably being specific to the fire detector 1, so that the control panel 5 can identify the fire detector that is faulty.
Landscapes
- 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 Alarms (AREA)
Description
- au moins certaines des valeurs susmentionnées qui ont été mesurées précédemment par l'unité centrale et dont dépend la valeur de référence, ont été mesurées plus d'une demi-heure avant la nouvelle mesure susmentionnée ;
- l'intervalle de temps entre deux mesures de la valeur du signal est compris entre 3 et 10 secondes ;
- la valeur de référence prise en compte pour chaque nouvelle mesure de la valeur du signal est la dernière valeur mesurée dudit signal ;
- la valeur de référence prise en compte pour chaque nouvelle mesure de la valeur du signal est une moyenne pondérée des n dernières mesures dudit signal, n étant un nombre entier au moins égal à 2 ;
- l'unité centrale a en mémoire une valeur de référence initiale, ladite unité centrale étant prévue pour calculer une différence entre cette valeur de référence initiale et la valeur mesurée du signal, et pour déclencher une signalisation de défaut si ladite différence est supérieure à un deuxième seuil prédéterminé supérieure au premier seuil.
- la figure 1 est une vue schématique montrant un exemple de détecteur d'incendie selon l'invention, connecté à une centrale également selon l'invention, et
- la figure 2 représente les signaux u et i reçus respectivement par le microprocesseur du détecteur d'incendie et par la centrale d'alarme lorsque le détecteur signale une alarme.
Claims (6)
- Système d'alarme comprenant plusieurs détecteurs d'incendie (1) communiquant avec une centrale d'alarme (5) éloignée, au moins l'un de ces détecteurs d'incendie (1) comportant, d'une part, une unité centrale électronique (6) et, d'autre part, un capteur d'incendie (7) qui mesure une grandeur physique dont les variations indiquent l'existence d'un incendie, ce capteur (7) transmettant à l'unité centrale (6), un signal électrique analogique qui a une valeur (u) représentative de ladite grandeur physique, l'unité centrale comportant des moyens (6a) pour mesurer la valeur du signal à intervalles de temps réguliers, et cette unité centrale étant conçue pour calculer une différence entre cette valeur mesurée et une valeur de référence (u0) du signal et pour émettre vers la centrale d'alarme (5) un signal d'alarme représentatif d'un incendie si et seulement si cette différence est supérieure à un premier seuil prédéterminé (δ3),
caractérisé en ce que la valeur de référence (u0) prise en compte pour chaque nouvelle mesure de la valeur du signal dépend d'au moins certaines des valeurs dudit signal mesurées précédemment par l'unité centrale (6),
et en ce que le premier seuil prédéterminé (δ3) est compris entre 10 % et 20 % de la valeur de référence (u0) du signal. - Système d'alarme selon la revendication 1, dans lequel au moins certaines des valeurs susmentionnées qui ont été mesurées précédemment par l'unité centrale (6) et dont dépend la valeur de référence, ont été mesurées plus d'une demi-heure avant la nouvelle mesure susmentionnée.
- Système d'alarme selon l'une quelconque des revendications précédentes, dans lequel l'intervalle de temps entre deux mesures de la valeur du signal est compris entre 3 et 10 secondes.
- Système d'alarme selon l'une quelconque des revendications précédentes, dans lequel la valeur de référence (u0) prise en compte pour chaque nouvelle mesure de la valeur (u) du signal est la dernière valeur mesurée dudit signal.
- Système d'alarme selon l'une quelconque des revendications 1 à 3, dans lequel la valeur de référence (u0) prise en compte pour chaque nouvelle mesure de la valeur (u) du signal est une moyenne pondérée des n dernières mesures dudit signal, n étant un nombre entier au moins égal à 2.
- Système d'alarme selon l'une quelconque des revendications précédentes, dans lequel l'unité centrale (6) a en mémoire une valeur de référence initiale (U), ladite unité centrale étant prévue pour calculer une différence entre cette valeur de référence initiale (U) et la valeur mesurée (u) du signal, et pour déclencher une signalisation de défaut si ladite différence est supérieure à un deuxième seuil prédéterminé (δ2) supérieur au premier seuil (δ3).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9409477 | 1994-07-29 | ||
FR9409477A FR2723237B1 (fr) | 1994-07-29 | 1994-07-29 | Dispositif de detection d'incendie avec transmission de signal electrique analogique a une unite centrale |
PCT/FR1995/001013 WO1996004625A1 (fr) | 1994-07-29 | 1995-07-27 | Dispositif de detection d'incendie comportant un capteur analogique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772851A1 EP0772851A1 (fr) | 1997-05-14 |
EP0772851B1 true EP0772851B1 (fr) | 1998-05-13 |
Family
ID=9465925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95926439A Expired - Lifetime EP0772851B1 (fr) | 1994-07-29 | 1995-07-27 | Dispositif de detection d'incendie comportant un capteur analogique |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0772851B1 (fr) |
JP (1) | JPH11509340A (fr) |
DE (1) | DE69502502T2 (fr) |
ES (1) | ES2115390T3 (fr) |
FR (1) | FR2723237B1 (fr) |
WO (2) | WO1996004624A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8681011B2 (en) | 2011-02-21 | 2014-03-25 | Fred Conforti | Apparatus and method for detecting fires |
CN103745553A (zh) * | 2013-12-25 | 2014-04-23 | 广西科技大学 | 一种火灾自动报警装置 |
US9117360B1 (en) | 2014-06-06 | 2015-08-25 | Fred Conforti | Low battery trouble signal delay in smoke detectors |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3127324A1 (de) * | 1981-07-10 | 1983-01-27 | Siemens AG, 1000 Berlin und 8000 München | Verfahren und anordnung zur erhoehung der ansprechempfindlichkeit und der stoersicherheit in einer gefahren-, insbesondere brandmeldeanlage |
JPS6219999A (ja) * | 1985-07-18 | 1987-01-28 | ホーチキ株式会社 | 火災報知装置 |
JPS62215848A (ja) * | 1986-03-18 | 1987-09-22 | Hochiki Corp | 感知装置 |
CH669859A5 (fr) * | 1986-06-03 | 1989-04-14 | Cerberus Ag | |
JPS6383900A (ja) * | 1986-09-29 | 1988-04-14 | ニツタン株式会社 | 環境異常検出器 |
-
1994
- 1994-07-29 FR FR9409477A patent/FR2723237B1/fr not_active Expired - Fee Related
-
1995
- 1995-07-27 EP EP95926439A patent/EP0772851B1/fr not_active Expired - Lifetime
- 1995-07-27 WO PCT/FR1995/001012 patent/WO1996004624A1/fr active Application Filing
- 1995-07-27 WO PCT/FR1995/001013 patent/WO1996004625A1/fr active IP Right Grant
- 1995-07-27 JP JP8506245A patent/JPH11509340A/ja active Pending
- 1995-07-27 ES ES95926439T patent/ES2115390T3/es not_active Expired - Lifetime
- 1995-07-27 DE DE69502502T patent/DE69502502T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ES2115390T3 (es) | 1998-06-16 |
JPH11509340A (ja) | 1999-08-17 |
FR2723237B1 (fr) | 1996-10-04 |
FR2723237A1 (fr) | 1996-02-02 |
WO1996004625A1 (fr) | 1996-02-15 |
DE69502502D1 (de) | 1998-06-18 |
WO1996004624A1 (fr) | 1996-02-15 |
EP0772851A1 (fr) | 1997-05-14 |
DE69502502T2 (de) | 1998-12-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1880373B1 (fr) | Dispositif de detection de la chute d' un corps dans un bassin | |
FR2596180A1 (fr) | Systeme de detection de fumees et analogues et detecteur correspondant | |
FR2689280A1 (fr) | Circuit de mise en silence d'alarme pour détecteur photoélectrique de fumée. | |
EP1446783B1 (fr) | Dispositif de securite filaire pour la detection du vol d'un objet a proteger et procede de fonctionnement. | |
FR2664973A1 (fr) | Dispositif de detection de rotation d'un element tournant tel que la turbine d'un compteur d'eau. | |
FR2830495A1 (fr) | Dispositif d'identification d'impact lateral ou de collision laterale dans un vehicule | |
FR2525006A1 (fr) | Detecteur d'intrusion | |
CH665724A5 (fr) | Detecteur de flamme. | |
EP3384592B1 (fr) | Procede et dispositif de detection d'un arc electrique dans une installation photovoltaïque | |
EP0772851B1 (fr) | Dispositif de detection d'incendie comportant un capteur analogique | |
WO2004051211A2 (fr) | Detecteur par voie optique de la presence de bulles de gaz dans un liquide | |
FR2509046A1 (fr) | Circuit de controle pour la protection de dispositifs s'appuyant sur plusieurs pieds, notamment des pylones pour conducteurs haute tension | |
EP0772855B1 (fr) | Dispositif de detection d'incendie avec correction de parametres perturbateurs | |
FR2598217A1 (fr) | Detecteur de proximite autocontrole | |
EP3552034B1 (fr) | Procede de fabrication d'un capteur de mesure pour un disjoncteur | |
FR2687240A1 (fr) | Dispositif de protection detectant la sollicitation du mecanisme d'une fermeture (serrure, verrou) et generant un signal d'information, d'alerte ou d'alarme. | |
EP0681723A1 (fr) | Dispositif antibrouillage radio infraudable pour systemes de surveillance d'intrusions | |
EP0266282B1 (fr) | Dispositif d'alarme détectant la modification d'assiette d'un corps | |
EP0694893B1 (fr) | Dispositif de détection d'alarme à boucles de courant, et balise de repérage de sous-zones pour un tel dispositif | |
FR2691822A1 (fr) | Procédé et système d'alarme par analyse d'un signal de réception d'un capteur. | |
EP0383649B1 (fr) | Appareil de détection et de signalisation des chutes des corps dans l'eau | |
EP1130403A1 (fr) | Détecteur pour contrôle de rotation | |
FR2741737A1 (fr) | Systeme d'alarme a incendie | |
FR2904525A1 (fr) | Dispositif d'evaluation de donnees physiologiques provenant de detecteurs | |
WO2005022174A1 (fr) | Systeme de detection et de localisation de defaillances dans une cloture electrifiee |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19970131 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE ES FR GB |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19970923 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE ES FR GB |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2115390 Country of ref document: ES Kind code of ref document: T3 |
|
REF | Corresponds to: |
Ref document number: 69502502 Country of ref document: DE Date of ref document: 19980618 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980601 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20000706 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20000711 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20000721 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20000801 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010727 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010728 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010731 |
|
BERE | Be: lapsed |
Owner name: SMYCZ EUGENIUSZ Effective date: 20010731 Owner name: LEWINER JACQUES Effective date: 20010731 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20010727 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020501 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20020810 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20130725 Year of fee payment: 19 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140731 |