EP0180907B1 - Dispositif avertisseur dans un système de signalisation de risque - Google Patents

Dispositif avertisseur dans un système de signalisation de risque Download PDF

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Publication number
EP0180907B1
EP0180907B1 EP85113784A EP85113784A EP0180907B1 EP 0180907 B1 EP0180907 B1 EP 0180907B1 EP 85113784 A EP85113784 A EP 85113784A EP 85113784 A EP85113784 A EP 85113784A EP 0180907 B1 EP0180907 B1 EP 0180907B1
Authority
EP
European Patent Office
Prior art keywords
sensor
detector
circuit
contacts
voltage
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
EP85113784A
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German (de)
English (en)
Other versions
EP0180907A3 (en
EP0180907A2 (fr
Inventor
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 AT85113784T priority Critical patent/ATE67878T1/de
Publication of EP0180907A2 publication Critical patent/EP0180907A2/fr
Publication of EP0180907A3 publication Critical patent/EP0180907A3/de
Application granted granted Critical
Publication of EP0180907B1 publication Critical patent/EP0180907B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade

Definitions

  • the invention relates to a detector arrangement in a hazard alarm system, in particular a fire alarm system, according to the features of the preamble of claim 1.
  • the detection is of great importance insofar as the detection should be reliable and, on the other hand, it should be inexpensive to manufacture.
  • the number of electrical contacts and their load form an important aspect for the connection technology of the detectors in a hazard detection system.
  • Conventional limit detectors generally use two contacts between the actual detector and its associated detector detection, via which all detectors of a detector line are connected in parallel between the wires of a two-wire line. A series connection of several detectors, each with two contacts, is also common.
  • At least three contacts are required for analog detectors, i.e. detectors with sensors (sensors) that record analog measured values and transmit them to the control center.
  • the sensor is supplied with energy via two contacts, while a third contact supplies a signal which is dependent on the measured variable.
  • This signal is then processed in an electronic circuit, which can be arranged in the detector, so that the signal can be transmitted to the control center in an addressed manner via the two-wire line.
  • further contacts can be provided to enable the identification of the detector type, the connection of parallel displays or the setting of a detector address.
  • the electronic circuit is integrated in the respective detector and actuates a switch which is activated as a function of the measured value. to interrupt or switch on one wire of the two-wire line while the other wire is connected.
  • This known detector arrangement also requires at least three contacts between the actual detector and the detector detection.
  • the object of the invention is therefore to provide a detector arrangement for a hazard alarm system which has a large number of analog value-measuring detectors, which allows both conventional limit value detectors or simple sensors (for example thermistor for heat detectors) and analog value-measuring sensors (for example for smoke detectors) few circuit and contact elements in the same detector connection.
  • the detector arrangement according to the invention has a sensor circuit with a sensor, which forms the actual plug-in detector, and an electronic circuit arrangement in the detector detection, a socket circuit. These two circuits are connected to each other via only two contacts, so that an analog value measuring sensor with only two connection contacts is connected in the detector.
  • the Sensor circuit on a sensor that is connected to the two contacts with a capacitor connected in parallel to the sensor via a diode.
  • a transistor is connected to the two contacts via a measuring resistor. This transistor is driven by a measuring output of the sensor, so that the sensor voltage at the measuring point of the sensor generates a proportional measuring current.
  • the detector arrangement according to the invention only requires two contacts for analog value measuring sensors. These are fritted with the operational voltage, for example the quiescent voltage of 20 volts, and with currents of several milliamperes, which increases the contact reliability. In the measuring phase, however, the sensor causes a current to flow in the microampere range, which thus allows considerable contact resistance. In this way it is possible to make the two contacts particularly robust and inexpensive.
  • analog value measuring sensors can be implemented in the same construction and operated in the same detector recording as limit detectors. This standardization enables savings in both development and production as well as in assembly and maintenance.
  • the sensor S forms the measuring element or the sensor, for example an optical scattered light sensor.
  • the sensor S is connected to the connections (+) and (-) at a voltage of e.g. 20 volts operated via the connection contacts K1 and K2.
  • the sensor circuit SES is connected via the connection contacts K1 and K2, as shown in FIG. 2, via a current measuring device SME to the detection line ML and is operated with the line voltage UL.
  • the sensor voltage US proportional to the measured variable of the sensor is created. If necessary, the sensor S at the input T can be triggered via the resistor RT by the measuring voltage UM at the beginning of the measuring time MZ of an interrogation cycle AZ.
  • the sensor voltage US is fed to the transistor TR and generates a measuring current IM via the measuring resistor RM which is proportional to the sensor voltage US and thus to the measured variable of the sensor S.
  • the capacitor C lying parallel to the sensor S serves on the one hand as an energy store and on the other hand generates the increased current IS for frying the contacts K1 and K2 during the idle time RZ, during which the idle voltage UR is applied.
  • the sensor S and the capacitor C are connected in the sensor circuit SES via the diode D to the contacts K1 and K2. If the detector arrangement according to the invention is operated in pulse detection technology, in which the individual detectors are connected in a chain to the detection line ML, the sensor circuit SES is arranged according to FIG. 2.
  • the circuit arrangement for the socket circuit is known in principle from the German patent DE-C-25 33 382.
  • the timing element ZG which is dependent on the analog measured value and can be controlled in terms of its running time, is located on the detection line ML. After the running time of the timer ZG, the switch SCH arranged in a wire of the message line ML is actuated by it and switches the next analog detector (M2) to the message line.
  • the sensor circuit SES is connected to the signal line ML via the two contacts K1 and K2 via a current measuring device SME.
  • the current measuring device SME controls the timing element ZG.
  • the individual detectors M1 to Mi of a signaling line ML are cyclically queried from the central station Z for their respective analog detector measured value, the respective detector address being determined in the central station and the alarm or fault criteria in the central station from the individual detector measured values of the respective detector.
  • a query cycle is composed of a long rest time RZ, a short start time SZ and a measurement time MZ as shown in the voltage and current diagram in FIGS. 3 and 4.
  • the line voltage UL is, for example, 20 volts.
  • the respective capacitors C of the sensor circuit SES are charged with this open-circuit voltage UR.
  • the measuring voltage UM which is lower than the rest voltage UR, is applied from the control center to the message line ML for the measuring time MZ.
  • a new interrogation cycle AZ begins with the open circuit voltage UR.
  • the sensor S is removed from the Storage capacitor C supplied with the voltage UC (UC ⁇ UR).
  • UC UC ⁇ UR
  • a measuring current IM cannot flow due to the missing line voltage UL.
  • the diode D blocks the current flow between the sensor S or the sensor circuit SES and the signal line ML or the socket electronics FS.
  • the line voltage UL is increased to the measurement voltage UM, for example 13 volts.
  • a measuring current IM now flows to the socket circuit, while the sensor S continues to be supplied with energy from the capacitor C.
  • the capacitor C is dimensioned such that the capacitor voltage UC, even if it decreases by a few volts, always remains greater than the measuring voltage UM, so that the diode D is blocked.
  • the line voltage UL is increased again from the measuring voltage UM to the open circuit voltage UR.
  • the diode D thus becomes conductive and the sensor current IS increases by the supply current for the sensor S.
  • FIG. 4 the corresponding current diagram of the line current IL is shown.
  • the process repeats itself continuously with each polling cycle.
  • the detector arrangement according to the invention can also be used for other transmission methods in addition to the embodiment described for the pulse detector technology.
  • at least two voltage levels must be generated either in the circuit electronics of the detector, which can then be used in the manner described.
  • Another possibility is to replace the diode with a switch which is replaced by a signal superimposed on the line voltage, e.g. a sound frequency signal, is controlled in a suitable manner.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Claims (3)

  1. Dispositif de signalisation dans une installation d'avertissement de danger, notamment une installation d'avertissement d'incendie, comportant un central (Z) possédant plusieurs lignes bifilaires de signalisation (ML), à laquelle est raccordée respectivement une multiplicité (i) de transmetteurs (M1...Mi), qui sont alimentés à partir du central (Z) par une tension de repos (UR) et dont les valeurs analogiques de mesure sont interrogées de façon cylique, pour l'obtention de critères d'alarme ou de perturbation, avec une tension de mesure (UM) qui diffère de la tension de repos (UR), et dans lequel chaque cycle d'interrogation (AZ) est constitué par une durée de repos (RZ), une durée de démarrage (SZ) brève par rapport à la durée de repos, et une durée de mesure (MZ), et dans lequel le circuit du transmetteur proprement dit est inséré dans une monture du transmetteur et le transmetteur est raccordé galvaniquement par plusieurs contacts à des bornes électriques et éventuellement à un dispositif de commutation placé dans la monture du transmetteur,
    caractérisé par le fait
    que le circuit du transmetteur est subdivisé en un circuit de détection (SES) et en un circuit (FS) inséré dans la monture, que seuls deux contacts (K1 et K2) sont prévus pour la liaison du circuit de détection (SS) au circuit (FS) situé dans la monture,
    que le circuit de détection (SES) contient un capteur (S), un condensateur (C) branché en parallèle avec le capteur et un transistor de commutation (TR), le capteur (S) étant raccordé par une diode (D) aux deux contacts (K1 et K2), tandis que la sortie (M) du capteur est raccordée à la base du transistor de commutation (TR), dont la voie collecteur-émetteur est raccordée aux deux contacts (K1 et K2) par l'intermédiaire d'une résistance de mesure (RM), la diode (D) étant bloquée pendant la durée de mesure (MZ), alors que pendant cette durée, le capteur (S) est alimenté en énergie à partir du condensateur (C),
    que le circuit (FS) situé dans la monture contient le montage pour le raccordement du transmetteur (M1...) à la ligne de signalisation (ML) et pour la transmission des signaux des transmetteurs au central (Z), et
    que les deux contacts (K1 et K2) sont frittés par la tension de repos (UR) pendant la durée de repos (RZ).
  2. Dispositif de signalisation suivant la revendication 1, caractérisé par le fait que le circuit de détection (SES) équipé du capteur (S) forme une unité de détection pouvant être enfichés dans la monture du transmetteur, et qu'il est prévu deux capteurs qui travaillent selon des principes physiques différents.
  3. Dispositif de signalisation suivant la revendication 1 ou 2, caractérisé par le fait que le capteur (S) possède une borne supplémentaire (T), qui peut être chargée par la tension de mesure (UM) par l'intermédiaire d'une résistance (RT).
EP85113784A 1984-10-31 1985-10-29 Dispositif avertisseur dans un système de signalisation de risque Expired - Lifetime EP0180907B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113784T ATE67878T1 (de) 1984-10-31 1985-10-29 Melderanordnung in einer gefahrenmeldeanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439895 1984-10-31
DE3439895 1984-10-31

Publications (3)

Publication Number Publication Date
EP0180907A2 EP0180907A2 (fr) 1986-05-14
EP0180907A3 EP0180907A3 (en) 1988-07-20
EP0180907B1 true EP0180907B1 (fr) 1991-09-25

Family

ID=6249209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113784A Expired - Lifetime EP0180907B1 (fr) 1984-10-31 1985-10-29 Dispositif avertisseur dans un système de signalisation de risque

Country Status (3)

Country Link
EP (1) EP0180907B1 (fr)
AT (1) ATE67878T1 (fr)
DE (1) DE3584228D1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1046761B (de) * 1955-09-02 1958-12-18 Ernst Fey Dipl Ing Verfahren und Anordnung zur Verminderung des UEbergangswiderstandes von Kontakten in Messanordnungen
DE1254241B (de) * 1965-02-08 1967-11-16 Licentia Gmbh Vorrichtung zur Sicherstellung einer gleichmaessig guten Kontaktgabe bei einer Anordnung zur Messstellenumschaltung
US4361833A (en) * 1980-03-25 1982-11-30 Monitran International, Inc. Multi-sensor alarm system and method of protecting a premises
DE3225106C2 (de) * 1982-07-05 1985-04-11 Siemens AG, 1000 Berlin und 8000 München Verfahren und Einrichtung zur automatischen Abfrage des Meldermeßwerts und der Melderkennung in einer Gefahrenmeldeanlage

Also Published As

Publication number Publication date
EP0180907A3 (en) 1988-07-20
EP0180907A2 (fr) 1986-05-14
ATE67878T1 (de) 1991-10-15
DE3584228D1 (de) 1991-10-31

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