EP0121102B1 - Dispositif pour la commutation d'avertisseurs individuels à l'opération de contrôle dans des installations de signalisation de danger - Google Patents

Dispositif pour la commutation d'avertisseurs individuels à l'opération de contrôle dans des installations de signalisation de danger Download PDF

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Publication number
EP0121102B1
EP0121102B1 EP84102148A EP84102148A EP0121102B1 EP 0121102 B1 EP0121102 B1 EP 0121102B1 EP 84102148 A EP84102148 A EP 84102148A EP 84102148 A EP84102148 A EP 84102148A EP 0121102 B1 EP0121102 B1 EP 0121102B1
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EP
European Patent Office
Prior art keywords
alarm
detector
inspection
measured value
pulse
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Expired
Application number
EP84102148A
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German (de)
English (en)
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EP0121102A3 (en
EP0121102A2 (fr
Inventor
Carl Dipl.-Ing. Koch
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Siemens AG
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Siemens AG
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Priority to AT84102148T priority Critical patent/ATE31986T1/de
Publication of EP0121102A2 publication Critical patent/EP0121102A2/fr
Publication of EP0121102A3 publication Critical patent/EP0121102A3/de
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Publication of EP0121102B1 publication Critical patent/EP0121102B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • 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
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits

Definitions

  • the invention relates to an arrangement according to the preamble of claim 1.
  • the inspector then goes to the respective detectors that he triggers.
  • the detector is triggered by a detector tester by applying test gas to the detector. Acknowledgment is given by the indicator lamp in the detector. This is successively checked area by area. However, the area switched to inspection is not ready to report, so that no alarm message can be issued.
  • the test is generally carried out by switching the detection area to be checked at the control center to inspection.
  • One person triggers the individual detectors in sequence.
  • a receipt is issued by the second person at the control center, who notifies the first person that the detector has been triggered using a radio.
  • the area switched to inspection is also not ready to report.
  • this two-man inspection can be carried out on non-automatic detectors, such as push-button detectors.
  • a more or less large spatial area is therefore not monitored during the inspection, which represents a considerable security risk.
  • This risk is reduced if, in addition to the automatic detectors, manually triggered detectors are also installed, which however must not be connected to the same detection line as the automatic detectors. Then the detection line for automatic and the detection line for manual detectors may never be switched to inspection in the same spatial area, so that if necessary an alarm from the checked area with the activated detection line is still possible.
  • this has the disadvantage that a larger number of detectors are not always ready to alarm.
  • the maintenance technician has to walk through the same spatial area twice in order to walk through the different detection zones and to trigger the respective detectors. This means a considerable amount of time.
  • Another disadvantage is that in the meantime the switchover from one detection line to the other detection line must be carried out for the same area in the control center, which leads to a further expenditure of time in the one-man inspection if the reporting location and the control center are far apart.
  • EP-A-0 066 200 describes a method and an arrangement for revision in a hazard, in particular fire alarm system.
  • the individual identifiable detectors are polled cyclically from the control center and connected to an evaluation device.
  • the detectors to be revised can be switched on individually or in groups on a revision display, whereby a first message from a detector to be revised is evaluated and saved as a revision message and a subsequent message from the same detector is evaluated and displayed as an alarm message.
  • This procedure can be used for all signaling systems in which the detectors can be identified individually and their status is queried cyclically by the control center.
  • This procedure can also be used in so-called pulse detection technology, in which the detectors are polled cyclically from the central station for their analog detector measurement values, in that the individual detectors are connected to the detection line in sequence.
  • the control center switches to revision mode and the alarm signal from the revised detector is evaluated as a revision signal. Then there is a switch back to normal operation, so that an alarm signal then issued by the already revised detector can also be recognized and displayed as an alarm signal in the control center.
  • this has the disadvantage that it must be precisely determined, on the one hand, which detectors are to be switched to revision mode in the control center and, on the other hand, which detectors are actually to be triggered.
  • US-C-4 194 191 It is also known from US-C-4 194 191 to provide ionization smoke detectors with an externally actuable, mechanically movable test device which interrupts the alpha radiation of the radioactive preparation, so that the penetration of smoke is simulated and an alarm message is issued .
  • the known test device does not have any electrical switching device which can be actuated for test purposes and which detects the measured value another electrical quantity of the detector influences that an inspection alarm is sent to the control center, which differs from the actual danger alarm and is recognized and displayed in the control center as an inspection alarm.
  • DE-C-25 33 382 describes an alarm system with several detectors connected to a central unit via an alarm line, in which all detectors are electrically disconnected from the line voltage of the alarm line at the beginning of each polling cycle and are then switched on in a predetermined order in this manner that after a time delay corresponding to its measured value, each detector additionally connects the following detector to the line voltage.
  • An evaluation device is located in the control center, which determines the respective detector address from the number of previous increases in the line current and the measured value from the length of the relevant switching delays. There, the analog detector measurement values are linked to obtain differentiated alarm messages or faults.
  • DE-B-26 38 068 describes a fire alarm system with a plurality of detectors connected via a detection loop to a control center, in which the detectors can be connected to the line for querying by time elements that can be controlled by transducers.
  • the time element of each detector also briefly switches on a load resistor that increases the line current to the signaling loop.
  • the increase in the line current caused by the connection of the individual detectors is evaluated in the control center.
  • the signaling address is determined from the number of current increases and the analogue measured values from the times of the increase, i.e. from the respective delay times.
  • the additional current pulse of the respective detector is changed according to the invention in a defined manner, so that the inspection state and the triggering of the detector in question is recognized as an inspection alarm from the pulse shape of the additional current pulse in the control center.
  • the detector has an electrical switching device that can be actuated mechanically or magnetically, for example, which is actuated from the outside and changes the additional current pulse in a very specific manner.
  • a switching device is provided in the respective detector, which influences the amplitude or the duration of the additional current pulse in such a way that the inspection message can be derived in the control center from the pulse height or from the pulse width.
  • a further timing element is expediently provided in each detector, which acts upon a first timing element, which connects the known load resistance, for example via a controlled transistor, to the signaling line for a predefinable time, the running time of the second timing element determining the pulse width of the additional pulse .
  • the running time of the second timing element can be determined by an RC element that is assigned to the timing element.
  • the RC element is switched to inspection mode in a defined manner, e.g. by changing the resistance value of the resistance of the RC element, so influenced that a certain pulse duration of the additional pulse is generated. This specific pulse duration is recognized in the control center as an inspection switchover and a subsequent triggering of the detector is interpreted as an inspection alarm.
  • the resistance value of the load resistance can be changed in a specifiable manner by the switching device for inspection operation, so that the pulse height of the additional pulse is influenced and the switchover to inspection operation of the detector in question is derived therefrom in the control center.
  • the detector measurement signal of the detector subsequently triggered is interpreted as an inspection alarm.
  • the analog detector measurement values are evaluated along with other criteria using the integration process.
  • the change in the measured value is evaluated according to the amount and the time in order to be able to derive an alarm criterion.
  • the inspection is carried out on the one hand by switching to inspection mode by triggering the switching device for inspection on the detector, which causes a defined jump in measured values, which, according to the evaluation method of such detection systems, makes the detector less sensitive and identifies them as being under inspection.
  • the measured value jump is used as preparation for inspection and the measured value signal of the detector that is subsequently triggered as Inspection alarm evaluated.
  • the switch can be made on the detector by attaching the detector tester.
  • the subsequent application of test gas to the detector and the previously reduced detector sensitivity lead to a rapid decay of the relatively small change in measured values after the detectors have been switched back to normal operation.
  • the measured value of the detector After a certain time, which corresponds to the decay of the test gas in the detector, the measured value of the detector returns to the ready-to-report state (idle value), just as the evaluation device in the control center switches back to normal measured value evaluation.
  • the measured value can be changed by a certain amount with an additional circuit arrangement in the respective detector.
  • the idle measurement value for the inspection switchover is brought into an inspection alarm zone by a defined measurement jump, which differs from the actual alarm zone.
  • the detector measured value jumps from the rest area into the alarm area after it has been triggered.
  • the detector is switched to inspection mode, for example by inserting a short-circuit plug, the detector measured value jumps from the rest area into a specified inspection area after it has been triggered.
  • the measurement signal of the triggered detector does not represent an alarm but an inspection alarm. This message can be displayed optically on the detector itself and / or in the control center.
  • the respective detector is reset after the inspection test.
  • each alarm line of a control center can have both automatic and manual alarms, since line-by-line switching to inspection operation is unnecessary. This means that a reporting area needs to be inspected only once.
  • a center Z is indicated with, for example, two detection lines ML1 and ML2.
  • a plurality of detectors are connected to each detection line, detectors M11, M12 etc. on detection line ML1 and detectors M21 and M22 etc. on detection line ML2.
  • a reporting line is first switched to inspection at the central station Z for a reporting area. The inspector then goes from detector to detector in this zone and triggers the detector. For example, if automatic detectors are connected to the ML1 detection line, the detectors are triggered by a detector tester using test gas. A receipt is given by the indicator lamp in the detector.
  • the relevant detection line ML1 is switched back to alarm readiness in the control center and the next detection line ML2 of the same detection area is switched to inspection.
  • the tester then goes from detector to detector of this ML2 detection line, on which manually operated detectors are installed, for example, and triggers them one after the other.
  • the inspector then goes back to the control center and switches the inspected zone back to alarm.
  • one person is at the control center and the second person triggers the detectors of a respective detection line switched to inspection.
  • Acknowledgment can be made from the operator at the control center to the trigger at the detector using a radio.
  • the inspected reporting lines must then be switched back to ready to report.
  • FIG. 3 An inspection operation according to the invention is indicated in FIG. 3.
  • a man in the row can only switch one detector to inspection at a time and check the functionality by triggering the detector. With this inspection procedure, only one detector is not ready to report for the short period of the inspection test, while all other detectors of the same detection line are ready to report.
  • the detector 4 is a circuit arrangement of a Detector for switching to inspection mode shown.
  • the detector measured value is changed in a defined manner for inspection.
  • the push button alarm M is connected to an alarm line ML which consists of two conductors between which a voltage is applied.
  • the detector M essentially contains a timer TG1, which is started when the voltage is applied.
  • the running time of the timer TG1 is influenced by the transducer MW.
  • the line voltage is briefly switched off for synchronization.
  • the timer TG1 is only triggered when the voltage is applied. So that the transducer MW is supplied with current during the shutdown of the line voltage, a capacitor C is provided which supplies the transducer MW in the short time of the shutdown.
  • a diode D1 prevents feedback.
  • the transistor TR1 switches the detection line ML through to the subsequent detector. In this way, one detector after the other is switched on in a chain, the analog measured value influencing the timing element TG1 in accordance with its size.
  • the first timer TG1 is followed by a second timer TG2.
  • the output of the second timer TG2 drives a second transistor TG2, which is connected via the resistor R to the signal line ML.
  • the running time of the second timing element TG2 is determined by the RC element R T2 and C T2 .
  • the voltage transducer MW is assigned a voltage divider R1, R2, which influences the detector measured value in a defined manner.
  • a resistor R3 is connected in parallel with the resistor R1 in parallel via the detector switch MS. If the push button detector is actuated, ie the detector switch MS is opened, the detector measured value changes abruptly and thus triggers an alarm.
  • the detector M has a further resistor R 'parallel to the resistors R1, R3, which leads via a connection X1 - X2 for a short-circuit plug KS to the detector switch MS.
  • the detector switch MS is closed, ie the resistor R3 is connected in parallel with the resistor R1 of the voltage divider R1, R2.
  • the detector M is switched to inspection mode with the short-circuit plug KS in the connection points X1-X2 and the resistor R '.
  • the signaling switch MS is triggered, a defined jump in the measured value is brought about, which causes a change in the measured value, but which differs from the change in the measured value when the alarm is given, as shown in FIG. 8 and is still carried out there.
  • FIG. 5 shows the block diagram of an automatic detector M, in which the detector measured value is also changed in a defined manner for the switchover (S) to inspection mode.
  • the detector M shows a similar structure to the detector M according to FIG. 4, with the difference that no push button switch MS and therefore no resistor R3 must be provided.
  • the measured value of the measured value converter MW is influenced in a defined manner in that the switch R for inspection operation switches the resistor R 'in parallel with the resistor R1 of the voltage divider R1, R2. The resulting jump in the measured value and the change in the measured value when the detector is triggered is shown in FIG. 10 and is explained there.
  • FIG. 6 and 7 each show a detector M, which also has a switch S for switching over to inspection mode, with which the pulse amplitude (FIG. 6) or the pulse duration (FIG. 7) of the additional pulse is influenced.
  • the detector M is shown in the block diagram. It is connected to the ML reporting line.
  • the transducer MW is connected via the diode D to the signal line ML.
  • Connected in parallel with it is a capacitor C, which supplies the transducer with current in the short time when the line voltage is switched off.
  • the running time of the first timer TG1 connected to the detection lines ML is influenced by the transducer MW.
  • the line voltage is briefly switched off for synchronization, as already described, and then switched on again.
  • the first timer TG1 thus begins to run as a function of the detector measured value via the measured value converter MW. After the timer TG1 has elapsed, the transistor TR1 switches the detection line ML through to the subsequent detector. In this way, as already explained above, one detector after the other is switched on in a chain.
  • the first timer TG1 is followed by a second timer TG2, the output of which drives a second transistor TR2, which is connected to the detection line ML via the load resistor R.
  • An additional current pulse (A) flows through the load resistor R, which briefly amplifies the line current (IL).
  • a further resistor R ' is connected in parallel to the load resistor R via the switch S for switching over to inspection mode.
  • the pulse amplitude (A2) for the inspection operation is influenced in a defined manner, as shown in FIG. 12.
  • FIG. 7 shows the block diagram of a detector M, in which the pulse duration (t) of the additional pulse (A) is influenced for the switchover S to inspection mode.
  • the circuit arrangement of the detector M is similar to the circuit arrangement of FIG. 6. In this case, however, no further resistor is assigned in parallel to the load resistor R, rather, the additional resistor (R ') is assigned to the RC element R T2 and C T2 .
  • the RC element determines the running time of the second timing element TG2.
  • the further resistor R ' T2 is connected in series with the resistor R T2 of the RC element, but is short-circuited with the switch S. If the detector M is switched to inspection, the switch S is opened and the pulse duration (t) of the additional pulse (A2) is influenced in the desired manner. This is shown in Fig. 13.
  • FIG. 8 shows a measured value diagram for a push button detector according to FIG. 4 with a defined measured value change for the inspection operation.
  • the detector measurement value MMW is plotted over the time t. This corresponds to an idle value MMW1 when the detectors are at rest.
  • the short-circuit plug KS described in FIG. 4 is plugged in at the time TR1 in order to switch over to inspection operation in the push-button detector.
  • the push button detector is triggered by actuating the push button (switch MS), so that the detector measured value MMW drops suddenly.
  • the circuit arrangement in the detector is designed so that the detector measured value MMW2 as the inspection alarm value is higher than the actual alarm value (MMW3) when the detector is triggered.
  • the evaluation device provided there can recognize that an inspection alarm value MMW2 is present.
  • the change in the measured value of the detector MMW1 - MMW2 is interpreted as a criterion for the inspection alarm.
  • the detector is reset, so that the detector resumes its idle value MMW1.
  • the short-circuit plug is then pulled, for example at time T4, so that the detector is ready for normal operation again.
  • Fig. 9 the change in measured value for the alarm case is shown for a push button detector.
  • the detector measurement value MMW1 corresponds to the idle value. If the push-button detector is actuated with the switch MS (FIG. 4) at time T1, a defined measurement value jump takes place.
  • This change in measured value MMW1 - MMW3 which differs from the change in measured value in inspection operation, is evaluated in the control center as a criterion for alarm.
  • the push button detector must be reset after it has been triggered so that, for example, the detector returns to normal operation at time T2 and assumes its idle value MMW1.
  • FIG. 10 shows a detector measured value diagram for the defined measured value change in an automatic detector.
  • the detector measurement value MMW is also plotted against the time t.
  • the detector has a detector measured value (idle value) MMW1, which is changed abruptly at time T1 by actuating the switch (S) for inspection operation.
  • This jump in measured values IMMW1 - MMW21 is recognized in the control center as a switchover to inspection mode.
  • the detector which is exposed to a test gas at time T2 and is thus triggered, emits an alarm by changing its measured value (MMW3), which is evaluated in the control center as a criterion for an inspection alarm.
  • the detector measurement value MMW drops, so that it falls into the alarm threshold (MMW3).
  • the switch (S) is reset again at time T3, for example when the detector tester is switched off, the instantaneous detector measured value MMW jumps again by the increased value. Amount (IMMW1 - MMW21) back. After the test gas in the detector has decayed, for example at time T4, the detector returns to its idle value MMW1. After this time, the detector detects any changes in measured values in the control center as real alarms.
  • the detector has a rest value MMW1, which for example changes slowly at time T2 due to a hazard criterion and moves in the direction of the alarm threshold (MMW3). This is recognized in the control center as an alarm criterion, for example at time T3. If there is no longer an alarm criterion, the detector returns to its idle value MMW1 (time T4).
  • MMW1 hazard criterion
  • the current curve IL of a detection line (ML) is shown over time t, according to the influence of the pulse amplitude (A) of the additional pulse according to Fig. 6.
  • the time T1 corresponds to the measured value of the first detector (M1) corresponding to the running time of Timing element (TG1).
  • the additional pulse generated after the timer (TG1) has the amplitude A1 and the duration t.
  • the following detector (M2) has a time period T2 according to its measured value until the next detector is switched on to the detection line. If, for example, the second detector (M2) is switched to inspection, the amplitude (A) is changed according to the invention according to FIG. 6, here raised to the amplitude level A2.
  • the time T3 of the first timer (TG1) of the third detector (M3) elapses in accordance with the measured measured value of the third detector (M3) until the additional pulse A3 of the third detector (M3) is then generated without being influenced becomes.
  • the second detector (M2) is switched to inspection.
  • the detector measured value (tJT2) of the triggered detector that is switched to inspection (M2) is not interpreted as an alarm criterion, but recognized as an inspection alarm.
  • FIG. 13 shows the pulse diagram IL of a signal line (ML), the additional pulse A in its duration t2 in the second detector (M2), corresponding to the time value T2 was changed so that it can be seen in the control center that this detector (M2) is switched to inspection mode.
  • the detector measurement values (Cr2) of the relevant triggered detector (M2) are then also evaluated as an inspection alarm and are not regarded as an alarm criterion.
  • the detector is first switched to inspection mode with the switch provided for this purpose on the detector, and then the detector is triggered.
  • the resulting change in the measured value is recognized in the control center as an inspection message and an inspection alarm is displayed on the detector.
  • the detector is then switched back to normal operation, so that later changes in the detector's measured values are recognized again as real alarm messages in the control center.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)

Claims (7)

1. Dispositif pour commuter des transmetteurs individuels sur le mode en inspection dans une installation de signalisation de dangers, comportant un central (Z) et au moins une ligne de signalisation (ML), à laquelle sont raccordés plusieurs transmetteurs (M1, M2...), qui sont interrogés de façon cyclique, et dans lequel, lors de l'interrogation cyclique de la valeur respective de mesure (MMW) dans chaque transmetteur (M), un dispositif de temporisation (TG1), sur lequel peut agir une valeur de mesure (MMW) d'un transmetteur par l'intermédiaire d'un transformateur de valeur de mesure (MW), est raccordé à la ligne de signalisation (ML) et une impulsion supplémentaire de courant (A) est produite grâce à un raccordement (TR2) de brève durée (TG2) d'une résistance de charge à la ligne de signalisation (ML), et dans lequel, dans le central (Z), l'adresse du transmetteur est dérivée du nombre des accroissements, provoqués de ce fait, du courant (IL) dans la ligne de transmission et la valeur de mesure (MMW) du transmetteur est dérivée de la durée (T) du retard respectif de commutation, caractérisé par le fait que chaque transmetteur (M) possède un dispositif de commutation électrique (S) pouvant être actionné de l'extérieur et qui influe de façon définie, pour l'inspection des transmetteurs, sur l'impulsion supplémentaire de courant (A) du transmetteur respectif (M) et qu'à partir de là, dans le central, l'état d'inspection du transmetteur considéré et les signaux délivrés du transmetteur déclenché ultérieurement sont identifiés en tant qu'alarme d'inspection par un dispositif prévu à cet effet.
2. Dispositif suivant la revendication 1, caractérisé par le fait que le dispositif de commutation (S) modifie l'amplitude (A1, A2...) et la durée (t1, t2...) de l'impulsion supplémentaire de courant (A) et que, dans le central, une signalisation d'inspection est dérivée de l'amplitude (A2) ou de la durée (t2) de l'impulsion supplémentaire de courant (A).
3. Dispositif suivant la revendication 2, caractérisé par le fait que la valeur ohmique de la résistance de charge (R) détermine l'amplitude (A) de l'impulsion supplémentaire (A1, A2...), une résistance supplémentaire (R') pouvant être raccordée (S) à la résistance de charge (R).
4. Dispositif suivant la revendication 2, caractérisé par le fait que la durée de marche d'un second dispositif de temporisation (TG2) détermine la durée (t1, t2...) de l'impulsion supplémentaire (A), auquel cas le dispositif de commutation (S) peut agir sur un circuit RC (RT2,CT2,R'T2) déterminant la durée de marche du second dispositif de temporisation (TG2).
5. Dispositif suivant l'une des revendications précédentes, caractérisé par le fait que le dispositif de commutation (S) peut être actionné par voie mecanique ou magnétique.
6. Dispositif suivant l'une des revendications précédentes, caractérisé par le fait que le dispositif de commutation (S) peut être actionné au moyen du raccordement d'un générateur de gaz d'essai à un transmetteur automatique.
7. Dispositif suivant l'une des revendications 1 à 5, caractérisé par le fait que, dans le cas de transmetteurs actionnés manuellement (transmetteurs à bouton- poussoir), le dispositif de commutation (S) est formé par un connecteur de court-circuit (KS).
EP84102148A 1983-03-03 1984-02-29 Dispositif pour la commutation d'avertisseurs individuels à l'opération de contrôle dans des installations de signalisation de danger Expired EP0121102B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84102148T ATE31986T1 (de) 1983-03-03 1984-02-29 Anordnung zur umschaltung einzelner melder auf inspektionsbetrieb in einer gefahrenmeldeanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3307616 1983-03-03
DE19833307616 DE3307616A1 (de) 1983-03-03 1983-03-03 Anordnung zur umschaltung einzelner melder auf inspektionsbetrieb in einer gefahrenmeldeanlage

Publications (3)

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EP0121102A2 EP0121102A2 (fr) 1984-10-10
EP0121102A3 EP0121102A3 (en) 1984-11-14
EP0121102B1 true EP0121102B1 (fr) 1988-01-13

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EP84102148A Expired EP0121102B1 (fr) 1983-03-03 1984-02-29 Dispositif pour la commutation d'avertisseurs individuels à l'opération de contrôle dans des installations de signalisation de danger

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EP (1) EP0121102B1 (fr)
AT (1) ATE31986T1 (fr)
DE (2) DE3307616A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3671120D1 (de) * 1985-07-29 1990-06-13 Siemens Ag Verfahren und vorrichtung zur betriebsmaessigen ueberwachung optischer rauchmelder.
DE102013100487A1 (de) 2013-01-17 2014-07-17 Helmut Thate Vorrichtung zur Herstellung von Speiseeis

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH501284A (de) * 1969-11-14 1970-12-31 Cerberus Ag Vorrichtung zur Prüfung der Funktionsbereitschaft von Rauchmeldern
DE2533382C2 (de) * 1975-07-25 1980-07-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verfahren und Einrichtung zur Übertragung von Meßwerten in einem Brandmeldesystem
US4194191A (en) * 1975-11-10 1980-03-18 General Electric Company Smoke simulating test apparatus for smoke detectors
DE2638068C3 (de) 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Brandmeldeanlage mit mehreren über eine Meldeschleife betreibbaren Meldern
DE3120986A1 (de) 1981-05-26 1982-12-16 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur revision in einem gefahren-, insbesondere brandmeldesystem

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EP0121102A3 (en) 1984-11-14
DE3307616A1 (de) 1984-09-06
ATE31986T1 (de) 1988-01-15
EP0121102A2 (fr) 1984-10-10
DE3468761D1 (en) 1988-02-18

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