EP0125485B1 - Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée - Google Patents

Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée Download PDF

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Publication number
EP0125485B1
EP0125485B1 EP84103961A EP84103961A EP0125485B1 EP 0125485 B1 EP0125485 B1 EP 0125485B1 EP 84103961 A EP84103961 A EP 84103961A EP 84103961 A EP84103961 A EP 84103961A EP 0125485 B1 EP0125485 B1 EP 0125485B1
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EP
European Patent Office
Prior art keywords
alarm
voltage
time
mmv1
measured value
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Expired
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EP84103961A
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German (de)
English (en)
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EP0125485A1 (fr
Inventor
Karsten Dipl.-Ing. Poulsen
Peer Dr.-Ing. Thilo
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Siemens AG
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Siemens AG
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Priority to AT84103961T priority Critical patent/ATE25885T1/de
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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
    • G08B29/20—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
    • 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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • 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

Definitions

  • the invention relates to a circuit arrangement for suppressing interfering signals in optical smoke detectors with a light-emitting diode which emits in pulses and a photodiode receiving the scattered light from the light-emitting diode in a fire alarm system, with the individual detectors of a detection line being delayed in a chain-like manner in a predetermined sequence in a cyclical interrogation from a control center the detector line is switched on and the delay time until the subsequent detector is switched on corresponds to the respective analog detector measured value and the detector measured value and the address are determined in the control center from the time of connection.
  • electromagnetic interference e.g. interference light, interference pulses
  • shielding labele.g. metallic shielding
  • repeated scanning e.g., laser scanning
  • These multiple scans are often logically linked to the transmission signal.
  • the influence of changes in the ambient temperature on the reporting behavior is either accepted or compensated for by high-quality, temperature-constant components or by additional temperature-compensating elements.
  • the measured fire parameter is transmitted to the control center as an analog signal and processed there with high-quality evaluation algorithms.
  • the measured value determined must be available for the query for a few milliseconds. All faults that occur during this time inevitably falsify the actual detector measured value.
  • other interference can also occur.
  • an interference voltage arises which is caused by switching on the interrogation voltage. The size of the interference voltage depends on the steepness of the interrogation voltage and thus on the position of the detector on the detection line and can be larger than the useful signal.
  • the object of the invention is therefore to provide a circuit arrangement for optical smoke detectors which transmit the analog detector measured value in a fire alarm system according to the so-called pulse detector system, which reduces or eliminates such interference.
  • optical smoke detector has a voltage supply device, a transmission circuit that can be controlled with the detector interrogation, for generating transmission pulses for the light-emitting diode of a specific period of time, which is considerably shorter than the interrogation period of a detector is one of the photodiode with amplifier connected downstream, can be controlled by the transmitter circuit instantaneous value memory for the short-term storage of the analog detector measured value and a downstream voltage / time converter, which is delayed according to the detector measured value via a switching transistor, the subsequent detector to the detector line turns on.
  • an instantaneous value memory a so-called sample and hold circuit
  • the optical smoke detector has a transmission circuit for generating transmission pulses for the light-emitting diode and the above-mentioned instantaneous value storage circuit, the transmission circuit being started with the detector inquiry in order to generate only a very short light pulse of high power, so that the signal-to-noise ratio is further enlarged.
  • disturbances that occur synchronously with the pulsed measurement are damped by a time filter.
  • This time filter is implemented, for example, by a time-shifted opening of the sample and hold circuit, or in a particularly advantageous manner by delaying the measuring time and opening the sample and hold circuit together.
  • the sample and hold circuit expediently has a timing element whose time constant causes the sample and hold circuit to open at different times.
  • the transmission circuit is preceded by a delay element which is started when the interrogation voltage is applied to the optical fire detector and which controls the transmission circuit after the set delay time has expired.
  • a further embodiment of the invention avoids component-consuming and energy-consuming compensation networks to compensate for the temperature response, which preferably have electro-optical components. Rather, it advantageously uses the inevitable temperature dependency of the other functionally necessary components and also allows the use of particularly inexpensive components with normal, temperature-dependent, that is to say "apparently bad" temperature behavior. For this purpose, according to the invention, special switching measures are taken, as result from the subclaims.
  • a detection line ML is connected to a control center Z according to FIG. 1, wherein a plurality of detectors M1 to Mn can be connected to the detection line ML (two-wire line) in a predetermined order.
  • Each Mi detector has three connection terminals.
  • One line (+ UL) of the ML detection line is common to all Mi detectors.
  • the second line (-UL) of the detection line is switched in each Mi detector by the MKi detector contact.
  • All detection lines (MLi) are connected to a central detector connection module (not shown here) in the control center Z and are queried one after the other.
  • FIG. 2a shows the voltage curve and FIG. 2b shows the current profile of a detection line (ML) with four detectors (M).
  • the operation of the chain synchronization method is as follows.
  • the signal line (ML) is supplied with voltage, the idle voltage URU.
  • the detector contacts MKi according to Fig. 1 are closed in all detectors Mi.
  • the interrogation of an alarm line ML begins with a start signal TST, the line voltage UL being reduced almost to zero and to the start voltage UST.
  • the detector contacts MKi in all detectors Mi are opened.
  • the query TAB begins with the application of the query voltage UAB, which is less than the quiescent voltage URU, to the detection line ML. Since all detector contacts MKi are open, the voltage UAB is only present at the first detector M1 of this detection line ML, and only this pulls its supply current IL according to FIG. 2b over the detection line.
  • a timer not shown here, is started in detector M1, the running time T1 of which depends on the measured value of this detector M1. After the measurement-dependent delay time T1 has elapsed, the detector M1 consumes an increased current during the time t, shown in FIG. 2b with ILP, which is evaluated in the control center.
  • the known detector circuit for increased current consumption is described in DE-A-2638068.
  • the detector contact MK1 of the first detector is closed, and thus the interrogation voltage UAb is applied to the second detector M2, where the process just described is repeated.
  • the interrogation voltage UAb is applied to the second detector M2, where the process just described is repeated.
  • all detectors Mi of an ML detection line are switched on in sequence. If no further current pulse ILP is detected on the detection line ML by the control center (Z) during the time TE (FIG. 2b), which of course must be longer than the maximum delay time Ti max of a detector Mi, this means that all detector contacts MKi are switched through and the query of this line can be ended.
  • the line voltage UL is switched to the idle value URU.
  • the time intervals T1, T2, T3, ... between the successive current pulses ILP are measured and evaluated, which are dependent on measured values from the corresponding detectors M1, M2, M3, ...
  • the detector address can be determined by counting the current pulses ILP.
  • a storage capacitor is provided in the detector Mi, which is arranged in the voltage supply device SPV of the respective detector (FIG. 3 ). This capacitor, which is not specifically shown there, is almost charged to the value of the idle voltage URU during the idle state TRU and discharges during the time for the start signal TST and the query TAB.
  • This capacitor is dimensioned in such a way that it can never discharge below the interrogation voltage UAB during the stated time, so that charging currents which would interfere with the interrogation process are avoided. Reloading does not start again until the open circuit voltage URU is applied.
  • FIG. 3 An optical fire detector according to the invention for the chain synchronization principle is shown in FIG. 3 in the block diagram, but without the instantaneous value memory according to the invention.
  • the RM optical smoke detector is connected to the ML detection line, the two-wire line (+ UL) and (-UL).
  • the voltage supply device SPV is connected to the detection line ML and supplies the transmitter circuit MMV1 and the light-emitting diode LED on the one hand and the photodiode FD and the voltage / time converter VTC on the other hand via the amplifier VER.
  • the out The voltage / time converter VTC leads to the switching transistor TR, which switches depending on the detector measured value from the voltage / time converter to the next detector.
  • a light pulse of the light-emitting diode LED is caused via the transmitter device MMV1 according to FIG. 3, is scattered by smoke particles in the measuring chamber (not shown), received by the photodiode FD and a voltage / time via the amplifier VER -VC converter supplied, which in turn controls the switching transistor TR to the next detector.
  • a connection point A is drawn between the amplifier VER and the voltage / time converter VTC;
  • the sample and hold circuit according to the invention is arranged between the connection point A and the voltage / time converter VTC, as will be shown later.
  • FIG. 4 shows various voltage diagrams as a function of the time t, in order to illustrate the signal curve of a detector according to FIG. 3.
  • the transmission voltage US for the transmission pulse or the light pulse of the light-emitting diode is shown under the line voltage UL.
  • an interference level in the form of the interference voltage UST ⁇ which influences the useful voltage UN at the output of the photodiode FD or the amplifier VER according to FIG. 3, so that an effective output signal UA at the connection point A results from the sum of the interference voltage UST ⁇ and the useful voltage UN results in the output voltage UA.
  • FIG. 4 shows how a light pulse is triggered when the interrogation voltage UAB is switched on, the light is scattered and the scattered light is received. It is shown how the interference voltage UST ⁇ disturbs the useful signal UN and thus the result, i.e. falsifies the effective output signal UA. This is remedied with the sample and hold circuit according to the invention.
  • FIG. 5 shows a sample-and-hold circuit SHS (instantaneous value memory) for an optical smoke detector RM with the switching transistor TRH1, the control elements CH1 and DH and the measured value memory CH2.
  • the sample and hold circuit SHS is arranged between the amplifier VER at connection point A and the voltage / time converter VTC at connection point B. The interference signal suppression caused thereby is shown in FIG.
  • FIG. 6 shows voltage diagrams similar to FIG. 4, but with the interference signal suppression achieved.
  • the light pulse of the light-emitting diode represented by the voltage US of the transmission pulse below the line voltage UL
  • the interference, interference voltage UST ⁇ is reduced .
  • the useful signal UN at the output (connection point A) of the amplifier VER is shorter and more intensive in accordance with the transmission pulse.
  • the effective output signal UB after the sample and hold circuit SHS at connection point B clearly shows this.
  • the output voltage UB is the sum of the interference voltage UST ⁇ and the useful signal UN.
  • FIG. 7 shows the line voltage UL as the first voltage diagram, which has a steep interference edge ST ⁇ FL1 when the first detector of the detection line is switched on (application of the interrogation voltage UAB) (shown in dashed lines).
  • the interference edge ST ⁇ FLn of the last detector (Mn) of a detection line (drawn solid) is less steep.
  • the voltage diagram of the transmission signal US for the light-emitting diode and for the control of the delay-responding sample and hold circuit (SHS) is shown.
  • the measuring process i.e. the current pulses through the light-emitting diode (LED) and the opening time for the sample and hold circuit (SHS) are delayed according to the invention until the interference, d. H. experience has shown that the interference signal UST ⁇ and the transients in the amplifier have ended.
  • the transmission signal US is pending for a short time TP.
  • the interference signal UST ⁇ at connection point A according to FIG. 5 is significantly greater for the first detector M1 than for the nth detector Mn.
  • the interference signal UST ⁇ is here without the optical signal, i. H. the received signal of the photodiode shown.
  • the effective output signal UB at connection point B i.e. shown at the output of the sample and hold circuit (SHS). It can be clearly seen that after the short transmission time TP for the light pulse of the light-emitting diode (LED) the interference signals UST ⁇ have essentially subsided, so that the delayed opening of the sample and hold circuit (SHS) results in a significantly less disturbed output signal UB at connection point B.
  • FIG. 1 shows a circuit arrangement according to the invention in a block diagram for an optical smoke detector, in which the measurement process is delayed by a delay element MMV2, which is connected upstream of the transmit circuit MMV1.
  • the voltage curve at connection point A and at connection point B is shown in FIG. 9.
  • FIG. 9 This is shown in FIG. 9, below the diagram of the line voltage UL with the interference edges ST ⁇ FL1 and ST ⁇ FLn when the interrogation voltage UAB is applied, the delay (TV) of the Transmission signal US is shown.
  • the delay element MMV2 When the interrogation voltage UAB is applied, the delay element MMV2 is started in accordance with FIG. After the delay time TV has elapsed, the transmitter circuit MMV1 is activated, which in turn emits the current pulse for the light-emitting diode LED for the pulse duration TP.
  • the sample and hold circuit (SHS) is only opened after the delay time TVD and the pulse duration TP of the transmit pulse (US) have elapsed.
  • FIG. 9 shows that in this case the interference signal UST ⁇ at the time of the measurement TM, regardless of its original size, has decayed to such an extent that it can no longer falsify the measurement.
  • the profile of the interference voltage UST ⁇ is shown below the signal profile of the transmission voltage US, the interference signal UST ⁇ at connection point A having decayed to almost zero after these times (TV + TP).
  • the effective useful voltage UB at the connection point B can then reach the voltage / time converter at the time TM without influencing the interference signal.
  • 9 shows the interference voltage UST ⁇ and the output voltage UB at the connection point B without a signal voltage from the photodiode.
  • FIG. 10 shows an advantageous embodiment of the delay element MMV2 according to the invention in the optical smoke detector RM.
  • the delay element MMV2 When the interrogation voltage (UAB) is applied, the delay element MMV2 is started, which controls the downstream transmission circuit MMV1 after the delay time TV has elapsed.
  • the delay time TV arises here in that the base-emitter voltage UBE of the transistor TRV is kept below the switch-on threshold of the transistor TV by the capacitor CV until the delay time has expired.
  • CBE means the base-emitter capacitance and UBE the base-emitter voltage of the transistor TRV.
  • the delay time TV is determined not only by the time constant of the RC element from the resistor RV and the capacitor CV, but also by the base-emitter capacitance CBE.
  • a change in temperature also changes the useful signal UN at the output of the amplifier VER.
  • the useful signal becomes smaller with increasing temperature.
  • This effect is essentially due to the decreasing conversion efficiency of the electro-optical components, the light-emitting diode LED and the photodiode FD, with increasing temperature and cannot be avoided in principle.
  • advantageous temperature compensation is achieved by means of a special circuit arrangement of the transmission circuit MMV1, without having to use further, for example temperature-stabilized, components in addition to the components which are necessary anyway.
  • the circuit arrangement according to the invention, as described in FIG. 11, advantageously allows inexpensive, temperature-dependent components to be used.
  • FIG. 11 shows an exemplary embodiment of the transmission circuit MMV1 according to the invention.
  • the delay element MMV2 was also shown in accordance with FIG. 10.
  • the transistor TRV becomes conductive via the resistor RV of the delay element MMV2.
  • the transistors T1 and T2 of the transmit circuit MMV1 become conductive via the timing element R1, R2, R3, C of the transmit circuit MMV1, so that a current flows through the light-emitting diode LED.
  • the magnitude of this current is determined by the stabilized voltage Ucc and the resistor R4.
  • a Zener diode ZD with positive temperature coefficients and a carbon resistor with negative temperature coefficients are provided for the resistor R4.
  • UBE2 is the base-emitter voltage of transistor TR2 and UCE1 is the collective-emitter voltage of transistor TR2 and UCE1 is the collector-emitter voltage of transistor TR1.
  • SHS sample and hold circuit
  • FIG. 12 shows an advantageous circuit arrangement for the sample and hold circuit according to FIG. 10.
  • the sample and hold circuit SHS is again arranged between the connection points A and B and is controlled by the transmit circuit MMV 1.
  • the sample and hold circuit SHS has a field effect transistor TRH2, the gate of which is driven by the transmit circuit MMV1.
  • a resistor RH2 is arranged between the connection point A and the field effect transistor TRH2, which can also be arranged behind the transistor TRH2 or else can be the internal resistance of the amplifier (VER).
  • the capacitor CH2 is the measured value storage capacitor of the sample and hold circuit.
  • the effective useful voltage is tapped at connection point B, which reaches the voltage / time converter (VTC) and controls the switching transistor (TR) with a delay in accordance with the analog detector measured value of the optical smoke detector (RM) in order to switch on the next detector.
  • VTC voltage / time converter
  • the time constant TH for storing the measurement signal in the sample and hold circuit is determined by the RC element from the resistor RH2 and the capacitor CH2. This time constant TH is chosen so that it is the condition Fulfills.
  • TP is the transmit pulse duration according to the above equation. This ensures that the voltage with which the capacitor CH2 is recharged becomes dependent on the transmission pulse duration TP.
  • the mode of operation of the temperature compensation is explained in more detail with reference to FIG. 13.
  • the transmission signal UR4 of the light-emitting diode (LED) is shown in FIG. 13a as a function of the time t. Below this, the output voltage UA at the connection point A is shown in FIG. 13b and below the output voltage UB at the connection point B in FIG. 13c.
  • the transmission signal UR4 is proportional to the current ILD through the light-emitting diode LED and satisfies the equation
  • the sample and hold circuit SHS according to FIG. 12 is conductive for the duration TP of the transmission signal (US or UR4), otherwise it is blocked.
  • the temperature dependency which is shown for -30 ° C and + 70 ° C, affects not only the transmit signal UR4, but also the output signals at connection points A and B.
  • the output voltage UA at connection point A is equal to the received signal of the sample and hold circuit.
  • This signal is also shown for the two temperatures -30 ° C and + 70 ° C in Fig.13b.
  • the transmission pulse duration TP becomes longer as the temperature increases. With increasing temperature, the amplitude of the received signal UA before the sample and hold circuit at connection point A becomes lower, however, the received signal UA before the sample and hold circuit at connection point A is present longer with increasing temperature corresponding to the pulse duration TP.
  • the output signal UB at connection point B i.e. at the output of the sample and hold circuit (SHS), is independent of the temperature fluctuation (measurement time TM -30 ° C) or measurement time + 70 ° C), as with the one in Fig. 13c measurement signal MS is illustrated. In this way it is possible to obtain a largely temperature-independent output signal UB, ie detector measurement signal MS, at connection point B without additional elements for temperature compensation. This increases the measurement accuracy and improves fire detection.
  • SHS sample and hold circuit

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  • Business, Economics & Management (AREA)
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Claims (9)

1. Montage pour supprimer les signaux parasites dans des détecteurs optiques de fumée (RM), comportant une diode à luminescence (LED) émettant de façon impulsionnelle et une photo- diode (FD) recevant la lumière diffuse de la diode à luminescence (LED), dans un avertisseur d'incendie, et dans lequel lord de l'interrogation cyclique effectuée à partir d'un central (Z), les différents transmetteurs (Mi) d'une ligne de signalisation (ML) sont raccordés en chaîne, d'une manière retardée dans le temps et selon une séquence prédéterminée, à la ligne de signalisation (ML) et le temps de retard s'écoulant jusqu'au raccordement du transmetteur suivant correspont à la valeur de mesure analogique respective du transmetteur, et dans lequel la valeur de mesure du transmetteur et l'adresse de ce dernier sont déterminées par le central à partir de l'instant du raccordement, caractérisé par le fait que le détecteur optique de fumée (RM) comporte un dispositif d'alimentation en tension (SPV), un circuit émetteur (MMV1), qui peut être commandé au moyen de l'interrogation (UAB) du transmetteur et qui sert à produire, pour la diode à luminescence (LED), des impulsions d'émission (US) possédant une durée (TP) qui est essentiellement inférieure à la durée d'interrogation d'un transmetteur, une mémoire de valeurs instantanées (SHS), qui est branchée en aval de la photodiode (FD) munie d'un amplificateur (VER) et peut être commandée par le circuit émetteur (MMV1) et sert à mémoriser pendant un bref intervalle de temps la valeur de mesure analogique du transmetteur, et un convertisseur tension/temps (VTC), branché en aval et qui, en fonction de la valeur de mesure du transmetteur, raccorde d'une manière retardée dans le temps, par l'intermédiaire d'un transistor d'inter- connextion directe (TR), le transmetteur suivant (Mi) de la ligne de signalisation (ML).
2. Montage suivant la revendication 1, caractérisé par le fait qu'en amont du circuit d'émission (MMV1) se trouve branchée une ligne à retard (MMV2) qui est mise en action lors de l'interrogation (UAB) des transmetteurs et commande le circuit d'émission (MMV1), d'une manière retardée dans le temps (TV).
3. Montage suivant la revendication 1 ou 2, caractérisé par le fait que la mémoire de valeurs instantanées (SHS) comporte un circuit de temporisation (RH2, CH2), dont la constante de temps (TH) détermine la durée de la mémorisation du signal de mesure (MS) de la mémoire de valeurs instantanées (SHS).
4. Montage suivant l'une des revendications 1 à 3, caractérisé par le fait que la mémoire de valeurs instantanées (SHS) est formée par un transistor de commutation (TRH1), qui est branché entre l'amplificateur (VER) de la photodiode (FD) et le convertisseur tension/temps (VTC) et qui comporte une résistance (RH1), par un condensateur (CH2) de la mémoire des valeurs de mesure et par des organes de commende (CH1, DH).
5. Montage suivant l'une des revendications 1 à 3, caractérisé par le fait que la mémoire de valeurs instantanées (SHS) est constituée par un transistor de commutation (RH2), qui peut être commandé directement par le circuit d'émission (MMV1) et est raccordé par l'intermédiaire d'une résistance (RH2) à l'amplificateur (VER), et par un condensateur (CH2) de la mémoire de valeurs de mesure, raccordé au convertisseur tension/temps (TV).
6. Montage suivant la revendication 1 ou 2, caractérisé par le fait que le circuit d'émission (MMV1 ) est constitué par un multivibrateur monostable.
7. Montage suivant la revendication 6, caractérisé par le fait que le circuit d'émission (MMV1 ) est raccordé à une tension d'alimentation stabilisée (Ucc), formée au moyen d'une diode Zener (ZD) possédant un coefficient de température positif et d'une résistance additionnelle (R5), et est formé par deux transistors (TR1, TR2), par un circuit de temporisation (R1, R2, R3, C) et par une résistance (R4) possédant un coefficient de température négatif, le courant (ILD) traversant la diode à luminescence (LED) et la durée (TP) des impulsions augmentant lorsque la température augmente.
8. Montage suivant la revendication 2, caractérisé par le fait que la ligne à retard (MMV2) est formée par un multivibrateur monostable.
9. Montage suivant la revendication 8, caractérisé par le fait que la ligne à retard (MMV2) comporte un transistor (TRV) raccordé par l'intermédiaire d'une résistance (R) à une tension d'ali- mentaton (GV) et dont le collecteur est relié au circuit d'émission (MMV1) et dont la base est raccordée d'une part par l'intermédiaire d'une autre résistance (RV) au conducteur positif (+UL) et d'autre part par l'intermédiaire d'un condensateur (CV) au conducteur négatif (-UL) de la ligne de signalisation (ML).
EP84103961A 1983-04-12 1984-04-09 Aménagement de circuits pour supprimer des signaux dans des détecteurs de fumée Expired EP0125485B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103961T ATE25885T1 (de) 1983-04-12 1984-04-09 Schaltungsanordnung zur stoersignalunterdrueckung in optischen rauchmeldern.

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Application Number Priority Date Filing Date Title
DE19833313137 DE3313137A1 (de) 1983-04-12 1983-04-12 Schaltungsanordnung zur stoersignalunterdrueckung in optischen rauchmeldern
DE3313137 1983-04-12

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EP0125485A1 EP0125485A1 (fr) 1984-11-21
EP0125485B1 true EP0125485B1 (fr) 1987-03-11

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ATE52632T1 (de) * 1985-07-29 1990-05-15 Siemens Ag Verfahren und vorrichtung zur betriebsmaessigen ueberwachung optischer rauchmelder.
DE58908831D1 (de) * 1988-10-06 1995-02-09 Siemens Ag Verfahren zum energiesparenden Betrieb von Gefahrenmeldern in einer Gefahrenmeldeanlage.
DE58906937D1 (de) * 1988-10-06 1994-03-24 Siemens Ag Verfahren zum energiesparenden Betrieb von Gefahrenmeldern in einer Gefahrenmeldeanlage.
EP0418411B1 (fr) * 1989-09-19 1994-03-02 Siemens Aktiengesellschaft Système d'avertissement d'incendie avec un avertisseur combiné
DE58908329D1 (de) * 1989-09-19 1994-10-13 Siemens Ag Verfahren und Vorrichtung zur Kompensation der Luftfeuchtigkeit in einem optischen Rauchmelder.
EP3457369B1 (fr) 2017-09-19 2021-05-19 Elmos Semiconductor SE Circuit pour capteur de fumée

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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
DE2638068C3 (de) * 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Brandmeldeanlage mit mehreren über eine Meldeschleife betreibbaren Meldern
US4149162A (en) * 1977-06-20 1979-04-10 American District Telegraph Company Battery discriminator circuit for smoke detectors

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EP0125485A1 (fr) 1984-11-21
DE3462637D1 (en) 1987-04-16
DE3313137A1 (de) 1984-10-18
ATE25885T1 (de) 1987-03-15

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