EP0694893B1 - Alarmdetektionsvorrichtung mit Stromschleifen und Bake zur Lokalisierung von Waterzonen für eine solche Vorrichtung - Google Patents

Alarmdetektionsvorrichtung mit Stromschleifen und Bake zur Lokalisierung von Waterzonen für eine solche Vorrichtung Download PDF

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Publication number
EP0694893B1
EP0694893B1 EP19950401785 EP95401785A EP0694893B1 EP 0694893 B1 EP0694893 B1 EP 0694893B1 EP 19950401785 EP19950401785 EP 19950401785 EP 95401785 A EP95401785 A EP 95401785A EP 0694893 B1 EP0694893 B1 EP 0694893B1
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Prior art keywords
beacon
alarm
current
conductor pair
conductors
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EP19950401785
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English (en)
French (fr)
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EP0694893A1 (de
Inventor
Jacques Lewiner
Eugeniusz Smycz
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ORWIN
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Orwin
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Definitions

  • the present invention relates to devices alarm detection with current loops.
  • such a device comprises a alarm center and at least one pair of conductors which extends between a first end connected to the central alarm and a second end where the two conductors are connected to each other, possibly through of a resistance
  • the alarm center comprising a voltage or current generator to generate a voltage or an electric current between the two conductors at the first end of the pair, with alarm sensors being arranged along the pair of conductors and connected each bypass between the two conductors, each sensor presenting a normal state in which it does not leave pass at most only a weak derivative current between the two conductors and an alarm state in which it leaves pass a larger derivative current between the two conductors, the voltage generator thus delivering to the pair of conductors a relatively low current when all sensors are in their normal state, and a current higher when at least one sensor is in the alarm state
  • the alarm center also comprising means for detection to detect an increase in the current delivered to the pair of conductors by the generator following a passage in the alarm state of at least one sensor.
  • Document EP 602,570 discloses an alarm detection device in which the triggering an alarm changes the characteristic impedance of a pair of conductors so that the control panel can identify the location of the activated alarm.
  • a device for alarm detection of the genre in question is basically characterized in that at least one tag is placed on the pair of conductors by separating the sensors into at least two groups of sensors, each beacon comprising detection means for detecting an increase in current in the pair of conductors at said level beacon when a sensor located between said beacon and the second end of the pair of conductors goes to the state alarm, said beacon further comprising means of signaling to then generate on the pair of conductors a characteristic signal specific to said beacon, the alarm center comprising reception means for receive the characteristic signal of each beacon and identify the beacon which emitted this characteristic signal, thereby determining which group of sensors the sensor in alarm state.
  • the central determines what is the farther from the first end of the pair of drivers who issued their characteristic code, the central also determines which group the sensor which has entered the alarm state, this group being immediately adjacent to said tag and located between said beacon and the second end of the pair of conductors.
  • the invention relates to an alarm detection device with current loops, comprising an alarm center 1 and generally several pairs 2 of conductors 3, 4 (of which only one is shown), which each extend between a first end 2a connected to the alarm center and a second end 2b where the two conductors 3, 4 are connected to each other by a resistor R, thus forming a loop generally called "current loop”.
  • the two conductors 3 and 4 are connected respectively at two terminals 1a and 1b of the control unit alarm. Between these two terminals 1a and 1b are mounted in series a voltage or current generator 5 and a resistance R0 so that a current i0 is generated in the pair 2 of conductors.
  • the two terminals of the resistor R0 are connected to the two inputs 6a and 6b of a voltage amplifier 6, whose output 6c is itself connected to an input analog 7a of a microprocessor 7.
  • microprocessor 7 could be replaced by a non-programmable electronic circuit logic gates, including in particular a comparator.
  • D1-D6 sensors which can be for example detectors fire or intrusion detectors distributed in a building.
  • Each of these sensors is connected between the two conductors 3 and 4, and in the normal state, they do not leave pass no current, or only a weak current between the two conductors 3 and 4.
  • one of the sensors When one of the sensors enters the alarm state, it establishes a circuit of relatively low resistance between the two conductors 3 and 4, so that it is traversed by a relatively large derivative current between the conductors 3 and 4 for a predetermined period worth by example one second.
  • the current i0 which flows in the loop of current at terminals 1a and 1b increases suddenly a value ⁇ a (for example from 5 to 30 mA) when one of the sensors goes into alarm state.
  • This increase in current results in a voltage increase at analog input 7a of the microprocessor 7, so that the microprocessor 7 can detect the passage to the alarm state of one of the D1-D6 sensors of the current loop considered.
  • the microprocessor 7 As soon as the microprocessor 7 has detected the alarm, it triggers a reaction, for example the operation of a siren 17, the transmission of a message to a remote monitoring, or whatever.
  • a reaction for example the operation of a siren 17, the transmission of a message to a remote monitoring, or whatever.
  • the microprocessor 7 can only identify the loop of current that contains the sensor in the alarm state, so the area of the building that corresponds to this current loop, but cannot determine more precisely what is the sensor which has entered the alarm state.
  • tags L1, L2 which, in the example shown, are two in number and separate the sensors in three groups 8, 9, 10.
  • each of the tags L1, 12 have four terminals 3a, 3b, 4a, 4b which allow each tag to be mounted in series with the two conductors 3, 4, the conductor 3 being connected on the one hand at terminal 3a and on the other hand at terminal 3b, and the conductor 4 being connected on the one hand to terminal 4a and on the other hand leaves at terminal 4b.
  • the terminals 3a, 3b are connected to each other in short circuit, while the terminals 4a and 4b are connected to each other by a resistor R1 at the terminals of which the two inputs 11a, 11b of a voltage amplifier 11, of which the output 11c is connected to an analog input 12a of a microprocessor 12.
  • terminals 3a and 4a of the beacon are also connected in series a resistor R2 and the collector and the emitter of a transistor 13 whose base is connected to a logic output 12b of the microprocessor 12 which activates this transistor or turns it off depending on the voltage it applies to the base of the transistor.
  • the analog input 12a of the microprocessor 12 receives a voltage signal proportional to the current flowing the resistor R1, and the microprocessor 12, provided with a internal clock or time counter, is programmed to activate transistor 13 for a predetermined period T, after a time delay ⁇ t1, ⁇ t2 (for example 10 microseconds to one second) specific to each tag, to from the moment it detects an increase ⁇ a in the current i1, i2 which crosses resistance R1.
  • ⁇ t1, ⁇ t2 for example 10 microseconds to one second
  • transistor 13 causes the passage of a derivative current in resistance R2 between the conductors 3 and 4, so that the current i0 which flows in the pair 2 of conductors at the first end 2a of this pair of conductors then increases by a value ⁇ b (for example from 5 to 20 mA).
  • the time delay ⁇ t1, ⁇ t2 of each tag L1, L2 is increasing from one tag to another, since the second end 2b towards the first end 2a of the pair of conductors.
  • the time delay ⁇ t1 corresponding to the L1 beacon furthest from the alarm center can be of 100 milliseconds
  • the time delay ⁇ t2 of the beacon L2 closest to the alarm center can be 200 milliseconds.
  • the microprocessor 12 of each tag can be designed to activate transistor 13 during duration T if it detects an increase in current ⁇ a in the associated resistance R1, but in order not to activate the transistor 13, if between the moment it detects the increase in current ⁇ a and the end of its time delay, it detects also an increase in current ⁇ b in the resistance R1 associated.
  • the evolution over time of the current i0 which flows through resistor R0 and which is measured by microprocessor 7 of the alarm center corresponds to one of the three timing diagrams in Figures 3 to 5, according to the group to which the sensor which has passed in alarm state.
  • the timing diagram is that of Figure 3: the current i0 increases by one ⁇ a value when the sensor goes into the alarm state, the currents i1 and i2 which pass through the tags respectively L1 and L2 themselves also increasing by ⁇ a, then, after the flow of the time delay ⁇ t1, the microprocessor 12 of the tag L1 activates its transistor 13, so that the corresponding resistance R1 is crossed by a current derivative, which causes an increase in the currents i0 and i2 with a value ⁇ b.
  • This increase in the current of ⁇ b for the duration T after the expiration of the timer ⁇ t1 constitutes a signal s characteristic of the beacon L1.
  • the microprocessor 12 of the L2 beacon does not activate its transistor 13, to the extent that it perceived the increase of the current i2 of the value ⁇ b before the end of the time delay ⁇ t2.
  • the microprocessor 7, provided with a internal clock or time sensor, can therefore determine that the alarm has occurred in group 8 of sensor, which corresponds for example to a sub-area of the building to inside the area represented by pair 2 of conductors.
  • the current i0 always increases by the value ⁇ a, as well as the current i2, but not the current i1.
  • the microprocessor 12 of the tag L1 does not detect the increase in current ⁇ a, while this increase in current is detected by the microprocessor 12 of the L2 tag.
  • the microprocessor 12 of tag L2 activates its transistor 13, so that the corresponding resistance R2 is traversed by a derivative current, which increases the value of ⁇ b by current i0, during duration T.
  • the microprocessor 7 can determine that the sensor which has entered the alarm state belongs to the group 9.
  • microprocessor 7 of the alarm center does not detect a new increase in current i0 during a period ⁇ t3, which can be for example one second at 5 seconds, it deduces that the sensor which has passed to the alarm state belongs to group 10.
  • beacons that detect the first current increase ⁇ a due to the passage to the alarm state of a sensor send their characteristic signal after their own time delay, that is to say in the present case activate their transistors 13 during duration T, the determination of the area which contains the sensor which has entered the alarm state only by measuring the time elapsed between first and second increases in current i0.
  • each tag L1, L2 could include, instead of the switch 13 and resistor R2, an oscillating circuit 14 controlled by microprocessor 12, this oscillating circuit 14 being coupled to one of the two conductors, for example the conductor 4, via a transformer 15.
  • the characteristic signal s which is emitted by each beacon is a sinusoidal signal having a determined frequency f, emitted for a period T after a time delay ⁇ t from the moment the beacon detected an increase in current ⁇ a in the pair of conductors.
  • the frequency f can for example be chosen in the range from 1 to 10 kilohertz.
  • This sinusoidal signal of frequency f is transmitted to the microprocessor 7 of the alarm center through its input analog 7a and microprocessor 7 is programmed to determine the frequency f of this signal, which makes it possible to determine which group 8, 9, 10 the sensor belongs to went to the alarm state.
  • the time delay ⁇ t is the same for all the L1 beacons, L2, the determination of the beacon which emitted the signal s can only be done by spectral analysis of the signal received by the analog input 7a of the microprocessor 7.
  • the alarm center 1 could include a transformer 20 coupled to one of the conductors of pair 2 and connected to a frequency detector 21.
  • the detector 21 may include for example one or more filters to determine a frequency range in which the frequency is included f, and it is connected to one or more inputs 7d of the microprocessor 7 to indicate to the microprocessor the range of frequency which includes frequency f.
  • the frequency detector 21 can also be a frequency measurement circuit which sends to input 7d of the microprocessor a signal representative of the frequency measured, input 7d then being an analog input.
  • the signal characteristic s emitted by each tag can also be consisting of a coded binary signal, transmitted for a period T after a time delay ⁇ t from the increase in current ⁇ a detected by said tag.
  • the tags L1, L2 can be as shown in Figure 2, and the timers ⁇ t are different from one tag to another, and from increasing preference from second end 2b to the first end 2a of the pair of conductors.
  • the current i0 which crosses the resistance R0 and the currents i1, i2 which cross the different tags depend on the number of sensors connected the along pair 2 of conductors, as long as these sensors are crossed by a weak current even when are not in the alarm state.
  • the microprocessors 7 and 12 can be designed to measure respectively the currents i0, i1, i2 each time the power is turned on alarm center after a stop, these measured values being memorized.
  • the central unit microprocessor 7 alarm detects an alarm when it measures an increase of the current i0 at least equal to a predetermined value ⁇ a (for example 5 mA) relative to the stored value of the current i0.
  • each beacon L1, L2 detects an alarm state of a sensor located between said tag and the second end 2b of the pair of conductors, when the current i1, i2 measured by this microprocessor 12 increases from the predetermined value ⁇ a to from the stored value of the current i1, i2.
  • the alarm center may also include a device for reset 16, for example a contact controlled by a key which is connected to an input 7b of the microprocessor 7 so initiate a measurement and storage of the current i0 which crosses resistance R0.
  • a device for reset 16 for example a contact controlled by a key which is connected to an input 7b of the microprocessor 7 so initiate a measurement and storage of the current i0 which crosses resistance R0.
  • the microprocessor 7 can also include a logic output 7c connected to the generator voltage 5, to generate this voltage generator 5 a predetermined signal when the reset device 16 is activated.
  • this signal is received at analog input 12a of microprocessor 12 of each tag L1, L2, which triggers a reading and a memorization of the current i1, i2, crossing the resistor R1 associated with each of these microprocessors.
  • the alarm states are then detected when the measured currents i0, i1, i2 are by a predetermined value ⁇ a greater than the values memorized.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Measurement Of Current Or Voltage (AREA)

Claims (11)

  1. Stromschleifen-Alarmerfassungseinrichtung mit einer Alarmzentrale (1) sowie mindestens einem Paar (2) von Leitern (3, 4), das sich zwischen einem ersten, mit der Alarmzentrale verbundenen Ende (2a) und einem zweiten Ende (2b) erstreckt, an dem die beiden Leiter (3, 4) miteinander verbunden sind, wobei die Alarmzentrale einen Spannungs- bzw. Stromgenerator (5) zum Erzeugen einer Spannung bzw. eines elektrischen Stroms zwischen den beiden Leitern (3, 4) am ersten Ende (2a) des Paars aufweist, Alarmsensoren (D1-D6) entlang des Leiterpaars (2) angeordnet und jeweils parallel zwischen die beiden Leiter (3, 4) geschaltet sind, jeder Sensor (D1-D6) einen Normalzustand besitzt, in dem er allerhöchstens den Durchgang eines schwachen Zweigstroms zwischen den beiden Leitern (3, 4) zuläßt, sowie einen Alarmzustand, in dem er den Durchgang eines stärkeren Zweigstroms zwischen den beiden Leitern (3, 4) zuläßt, so daß der Spannungsgenerator (5) an das Leiterpaar (2) einen relativ schwachen Strom (i0) legt, wenn sich alle Sensoren (D1-D6) in ihrem Normalzustand befinden, und einen höheren Strom, wenn sich mindestens ein Sensor im Alarmzustand befindet, die Alarmzentrale (1) des weiteren Erfassungseinrichtungen (R0, 6, 7) zum Erfassen eines Anstiegs des vom Generator (5) an das Leiterpaar gelegten Stroms (i0) infolge des Übergangs mindestens eines Sensors (D1-D6) in den Alarmzustand aufweist, dadurch gekennzeichnet, daß mindestens eine Bake (L1, L2) derart auf dem Leiterpaar (2) angeordnet ist, daß sie die Sensoren (D1-D6) in mindestens zwei Gruppen (8, 9, 10) von Sensoren aufteilt, jede Bake (L1, L2) Erfassungseinrichtungen (R1, 11, 12) zum Erfassen eines Stromanstiegs in dem Leiterpaar (2) auf der Höhe dieser Bake aufweist, sobald ein zwischen der Bake und dem zweiten Ende (2b) des Leiterpaars angeordneter Sensor in den Alarmzustand übergeht, die Bake des weiteren Signalisierungseinrichtungen (12, 13; 12, 14, 15) zum darauffolgenden Erzeugen eines für diese Bake typischen charakteristischen Signals (s) auf dem Leiterpaar (2) aufweist, die Alarmzentrale (1) Empfangseinrichtungen (R0, 6, 7) zum Empfangen des charakteristischen Signals einer jeden Bake und Identifizieren derjenigen Bake aufweist, die dieses charakteristische Signal ausgegeben hat, wodurch bestimmt wird, welcher Gruppe (8, 9, 10) von Sensoren der im Alarmzustand befindliche Sensor angehört.
  2. Vorrichtung nach Anspruch 1 mit mehreren, entlang des Leiterpaars (2) zwischen dessen ersten und zweiten Ende (2a, 2b) angeordneten Baken (L1, L2), bei der die Signalisierungseinrichtungen (12, 13; 12, 14, 15) der verschiedenen Baken (L1, L2) dazu vorgesehen sind, ihr charakteristisches Signal nach einer für die jeweilige Bake typischen Verzögerung (Δt1, Δt2) auszugeben, nachdem die Erfassungseinrichtungen der Bake das Vorhandensein eines im Alarmzustand befindlichen Sensors zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars erfaßt haben.
  3. Vorrichtung nach Anspruch 2, bei der die charakteristische Verzögerung (Δt1, Δt2) einer jeden Bake (L1, L2) vom zweiten Ende (2b) des Leiterpaars aus auf das erste Ende (2a) hin von Bake zu Bake zunimmt.
  4. Vorrichtung nach Anspruch 3, bei der jede Bake Empfangseinrichtungen (Rl, 11, 12) zum Empfangen der von den gegebenenfalls vorhandenen, zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars angeordneten weiteren Baken ausgegebenen charakteristischen Signale aufweist, wobei die Signalisierungseinrichtungen dieser Bake dazu konzipiert sind, das charakteristische Signal (s) der Bake nicht auszugeben, falls die Empfangseinrichtungen dieser Bake ein charakteristisches Signal einer der weiteren, zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars angeordneten Baken empfangen haben.
  5. Vorrichtung nach einem der Ansprüche 3 und 4, bei der das von jeder Bake ausgegebene charakteristische Signal (s) in einem Anstieg des zwischen dieser Bake und dem ersten Ende (2a) des Leiterpaars durch das Leiterpaar (2) fließenden Stroms besteht, wobei dieser Stromanstieg während einer vorgegebenen Zeitdauer (T) nach dem Ablauf der für diese Bake charakteristischen Verzögerung (Δt1, Δt2) ab dem Zeitpunkt hervorgerufen wird, an dem diese Bake zwischen sich selbst und dem zweiten Ende (2b) des Leiterpaars einen im Alarmzustand befindlichen Sensor erfaßt hat, und dieser Stromanstieg durch das Herstellen eines Zweigkreises zwischen den beiden Leitern (3, 4) des Leiterpaars auf der Höhe dieser Bake hervorgerufen wird.
  6. Vorrichtung nach einem der Ansprüche 3 und 4, bei der das von jeder Bake ausgegebene charakteristische Signal ein codiertes Binärsignal ist.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der das von jeder Bake ausgegebene charakteristische Signal ein Sinussignal mit einer für diese Bake typischen Frequenz ist, das während einer vorgegebenen Zeitdauer (T) ausgegeben wird.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Erfassungseinrichtungen (R0, 6, 7; R1, 11, 12) der Alarmzentrale (1) und einer jeden Bake (L1, L2) dafür konzipiert sind, zumindest bei jeder Inbetriebnahme der Alarmzentrale (1) nach einer Abschaltung die Werte der Ströme (i0, i1, i2), die jeweils am ersten Ende (2a) des Leiterpaars und auf der Höhe einer jeden der Baken (L1, L2) durch das Leiterpaar (2) fließen, zu messen und zu speichern, die Erfassungseinrichtungen (R0, 6, 7) der Alarmzentrale (1) dazu konzipiert sind, einen Alarm zu erfassen, sobald der Strom (i0), der am ersten Ende (2a) des Leiterpaars durch das Leiterpaar (2) fließt, von dem gespeicherten Wert des Stromes, der am ersten Ende (2a) des Leiterpaars durch das Leiterpaar fließt, um einen vorgegebenen Wert ansteigt, und die Erfassungseinrichtungen (R1, 11, 12) einer jeden Bake (L1, L2) dazu konzipiert sind, einen Alarmzustand eines zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars angeordneten Sensors zu erfassen, wenn der Strom (i1, i2), der auf der Höhe dieser Bake durch das Leiterpaar fließt, von dem von den Erfassungseinrichtungen der Bake gespeicherten Wert um einen vorgegebenen Wert ansteigt.
  9. Vorrichtung nach einem der Ansprüche 1 bis 7, welche des weiteren eine Reinitialisierungs-Steuereinrichtung (16) aufweist, und bei der die Erfassungseinrichtungen (R0, 6, 7; R1, 11, 12) der Alarmzentrale (1) und einer jeden Bake (L1, L2) dazu konzipiert sind, bei jeder Betätigung der Reinitialisierungs-Steuereinrichtung (16) die Werte der Ströme (i0, il, i2), die jeweils am ersten Ende (2a) des Leiterpaars und auf der Höhe einer jeden der Baken (L1, L2) durch das Leiterpaar (2) fließen, zu messen und zu speichern, die Erfassungseinrichtungen (R0, 6, 7) der Alarmzentrale (1) dazu konzipiert sind, einen Alarm zu erfassen, wenn der Strom (i0), der am ersten Ende (2a) des Leiterpaars durch das Leiterpaar (2) fließt, von dem gespeicherten Wert des Stroms, der am ersten Ende (2a) des Leiterpaars durch das Leiterpaar (2) fließt, um einen vorgegebenen Wert ansteigt, und die Erfassungseinrichtungen (R1, 11, 12) einer jeden Bake (L1, L2) dazu konzipiert sind, einen Alarmzustand eines zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars angeordneten Sensors zu erfassen, wenn der Strom (i1, i2), der auf der Höhe dieser Bake durch das Leiterpaar fließt, von dem durch die Erfassungseinrichtungen der Bake gespeicherten Wert um einen vorgegebenen Wert ansteigt.
  10. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Alarmzentrale (1) und jede Bake (L1, L2) jeweils einen Mikroprozessor (7, 12) aufweisen, der Meßeinrichtungen (R0, 6; R1, 11) zum Messen der Ströme zugeordnet ist, die jeweils am ersten Ende (2a) des Leiterpaars und auf der Höhe einer jeden Bake durch das Leiterpaar (2) fließen, wobei der Mikroprozessor (12) einer jeden Bake einen Bestandteil der Signalisierungseinrichtungen (12, 13; 12, 14, 15) dieser Bake bildet.
  11. Bake (L1, L2) für eine Stromschleifen-Alarmerfassungseinrichtung nach einem der vorhergehenden Ansprüche, welche aufweist:
    Verbindungseinrichtungen (3a, 3b, 4a, 4b), welche das Anschließen der Bake an das mit der Alarmzentrale (1) verbundene Leiterpaar (2) ermöglichen,
    Erfassungseinrichtungen (R1, 11, 12) zum Erfassen eines Stromanstiegs in dem Leiterpaar (2) auf der Höhe dieser Bake, sobald ein zwischen dieser Bake und dem zweiten Ende (2b) des Leiterpaars angeordneter Sensor in den Alarmzustand übergeht,
    und Signalisierungseinrichtungen (12, 13; 12, 14, 15) zum darauffolgenden Erzeugen eines für diese Bake typischen charakteristischen Signals auf dem Leiterpaar (2).
EP19950401785 1994-07-29 1995-07-27 Alarmdetektionsvorrichtung mit Stromschleifen und Bake zur Lokalisierung von Waterzonen für eine solche Vorrichtung Expired - Lifetime EP0694893B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409475A FR2723234B1 (fr) 1994-07-29 1994-07-29 Dispositif de detection d'alarme a boucles de courant, et balise de reperage de sous-zone pour un tel dispositif
FR9409475 1994-07-29

Publications (2)

Publication Number Publication Date
EP0694893A1 EP0694893A1 (de) 1996-01-31
EP0694893B1 true EP0694893B1 (de) 1999-06-09

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EP19950401785 Expired - Lifetime EP0694893B1 (de) 1994-07-29 1995-07-27 Alarmdetektionsvorrichtung mit Stromschleifen und Bake zur Lokalisierung von Waterzonen für eine solche Vorrichtung

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EP (1) EP0694893B1 (de)
DE (1) DE69510135T2 (de)
ES (1) ES2133688T3 (de)
FR (1) FR2723234B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321747B (en) * 1997-01-30 2000-10-18 Rafiki Protection Limited Alarm system
NO346958B1 (en) * 2020-10-16 2023-03-20 Dimeq As An Alarm Detection System

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676877A (en) * 1970-04-18 1972-07-11 Mittan Co Ltd Fire alarm system with fire zone locator using zener diode voltage monitoring
EP0602570B1 (de) * 1992-12-18 1999-05-06 Siemens Aktiengesellschaft Gefahrenmeldeanlage

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FR2723234B1 (fr) 1996-10-18
DE69510135D1 (de) 1999-07-15
ES2133688T3 (es) 1999-09-16
DE69510135T2 (de) 2000-04-20
EP0694893A1 (de) 1996-01-31
FR2723234A1 (fr) 1996-02-02

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