EP2858046B1 - Dispositif d'alarme visuelle - Google Patents

Dispositif d'alarme visuelle Download PDF

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Publication number
EP2858046B1
EP2858046B1 EP13186979.4A EP13186979A EP2858046B1 EP 2858046 B1 EP2858046 B1 EP 2858046B1 EP 13186979 A EP13186979 A EP 13186979A EP 2858046 B1 EP2858046 B1 EP 2858046B1
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EP
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Prior art keywords
visual alarm
bus
vad
visual
alarm
Prior art date
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EP13186979.4A
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German (de)
English (en)
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EP2858046A1 (fr
Inventor
Robin Janßen
Carsten Menzel
Michael Barson
Waldemar Ollik
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Novar GmbH
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Novar GmbH
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • G08B5/38—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources using flashing light
    • 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
    • G08B25/04—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 using a single signalling line, e.g. in a closed loop
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Definitions

  • the present invention relates to a bus coupled visual alarm device and especially to a visual alarm device (AAD or VAD) coupled to a bus, e.g. a two wired bus, for informing people within a building about hazardous situations or events.
  • AAD visual alarm device
  • VAD visual alarm device
  • the European Standard EN54-23 which is intended to be binding in near future, specifies the requirements, test methods and performance criteria for visual alarm devices in a fixed installation intended to signal a visual warning of a fire between the fire detection and fire alarm system and the occupants of a building. It covers those devices which derive their operating power by means of a physical electrical connection to an external source such as a fire alarm system.
  • the visual alarm devices can be pulsing or flashing visual alarm devices.
  • VADs can be classified into three categories, namely ceiling mounted devices, wall mounted devices and an open class category. Each of these categories has specific targets for light distribution patterns. The devices will have to guarantee a coverage volume where a required illumination of 0.4 lux or 0.4 lm/m 2 is met.
  • the flash rate of a VAD should be between 0.5 Hz and 2 Hz and should emit either a red or white flash.
  • VADs Light dispersion characteristics are required according to the VADs intended mounting position.
  • Wall mounted VAD will be effective in a wide range of applications, but the manufacturer will be required to state a mounting height, which is a minimum 2.4 m, followed by the width of a square room over which the VAD will provide coverage. Therefore, the specification code with a VAD suitable for a wall application could read W-2.4-6, i.e. mounted at a height of 2.4 m the VAD will cover a room 36 m 2 .
  • the VAD will therefore be required to cover the volume below its mounting height.
  • Ceiling mounted VADs are suitable for broad coverage in regular shaped rooms. Ceiling VADs must state the height of the ceiling at which it is designed to operate. This can be 3 m, 6 m or 9 m. The VAD in this case needs to radiate light in a cylinder below the mounting point. Therefore the specification code could read C-6-6 i.e. mounted at a ceiling height of 6 m, the VAD will cover a cylinder 6 m in diameter.
  • VADs need to have higher light output levels than those generally used in the market today, leading to a significant increase in current consumption due to the use of higher output devices or to a greater number of less powerful units.
  • the present bus systems used to connect the VADs with a control panel and to supply power to the VADs have a limited cross section of the wires and allow only a limited amount of electrical current.
  • the number of VADs, which can be connected to the bus is therefore limited.
  • AAD acoustic alarm devices
  • a visual alarm device for a bus connected alarm system according to claim 1 is provided.
  • each set of operation setting values comprises at least one of a value for the duty ratio of the visual alarm element, an electrical power level of the visual alarm element, and time value for a flash of the visual alarm element.
  • the visual alarm element comprises a plurality of LEDs connected in series.
  • the visual alarm element comprises a selecting unit for selecting one set of operation setting values.
  • the storage unit is a write protected storage unit (EEPROM) storing only one set of operation setting values.
  • EEPROM write protected storage unit
  • the controller is configured to transmit data via the bus, the data being representative for the selected set of operation setting values.
  • the visual alarm element comprises a capacitor for supplying power to the visual alarm element during an alarm, said capacitor being connected to be charged through the bus.
  • the capacitor has a capacity for storing electrical energy, which can supply power to the visual alarm element at least for predefined alarm period.
  • Fig. 1 shows an exploded view of a combined audio and visual alarm device configured to be mounted at a wall.
  • This VAD comprises mounting box 1, an outer horn 3 and a horn cup 5, forming together a housing.
  • a main printed circuit board (pcb) 7 As can be seen in Fig. 3 within the housing there is provided a main printed circuit board (pcb) 7 and a strobe printed circuit board 9.
  • a piezoelectric sound element 11 and a LED based optic 13 is connected with the main pcb 7 and the strobe pcb 9, respectively.
  • the alarm device is configured so as to be connected to a two wired bus supplying power and commands to the alarm device.
  • Different bus configurations e.g. those having dedicated lines for power supply and for commands, can be used instead.
  • Fig. 2 shows in more detail the optical components of the VAD of Fig. 1 .
  • the VAD of this example comprises five LEDs 13 in total. Two of them are fixed on raised tabs.
  • a lens 15 is located near the three central LEDs.
  • a reflector 17 cooperates with the LEDs 13 so as to guide the light emitted from the LEDs 13 in the desired directions.
  • the VAD is equipped with five LEDs 13 and the corresponding optics, this is not essential for the present invention, and any number of LEDs or other light emitting elements might be used.
  • a reflector 17 and a lens 15 it will be possible to provide other light guide members, like fiber optics.
  • the VAD of Fig. 1 and Fig. 2 is intended as a wall mounted VAD. It is obvious for a skilled person that a VAD to be mounted at a ceiling will have a different configuration of the optic and/or a different number of LEDs.
  • the LEDs 13 in the VAD will be operated in case of an alarm or for testing purposes so as to emit light in form of pulses or flashes.
  • the luminous intensity of pulsed light is different compared to the intensity of non-pulsed light due to the behavior of the human eye.
  • the maximum value of effective intensity is obtained when t2 and t1 are chosen so that the effective intensity is equal to the instantaneous intensity at t2 and t1.
  • the Blondel-Rey factor is the reciprocal of the ratio between effective intensity to steady state intensity. It describes how much more luminous intensity in a pulse is needed to reach the steady state intensity of non-pulsed light.
  • the effective intensity is only about 20% of the steady state intensity.
  • the luminous intensity of the pulse needs to be five times higher to reach the steady state intensity. As consequence, five times more pulse power is needed.
  • the average power will always increase with increasing pulse duration because to double the pulse duration means not to double the effective intensity or to halve the pulse power.
  • Fig. 3 shows the ideal coverage area for a ceiling mounted VAD.
  • the lens 15 and any reflector 17 shall be optimized for the ceiling-mounted device.
  • the coverage area is indicated for a VAD fulfilling the standard for a C-3-7.2, this means for a signaling range in form of a cylinder with a height of 3 m and a diameter of 7.2 m.
  • the minimum light emission of the cylinder base and the shell surface should be 0.4 lx, as mentioned in the introductory part.
  • the light emission has to be adapted accordingly, so as to achieve the required minimum light emission of the cylinder base of 0.4 lx.
  • Fig. 4 shows an example of a circuit configuration for a VAD according to the invention.
  • LED driver current controlled switch mode power supply
  • the operational mode is preferably a pulse control with a pulse duration between 50ms to 200ms (0 to 200ms are allowed according to EN54-23).
  • the energy for the pulse is taken from an energy storage 21 (e.g. capacitor or accumulator).
  • the energy storage 21 is recharged by a bus 23 via a charging unit 25 controlled by a controller 27 (MCU).
  • MCU controller 27
  • the flash rate can be 0.5s to 2s (according to EN54-23, but may vary in different countries so local regulations need to be considered) and has a direct impact on the average current consumption and consequently on the main current limit of the device because the energy storage 21 needs to recharge within this time. Accordingly the VDA is equipped with a current limiter 29.
  • the current limiter 29 of this VAD is variable and can be controlled by the controller 27.
  • the current limiter 29 limits the maximum current the VAD can draw from the bus 23.
  • electrolytic capacitors e.g. gold cap, super cap
  • accumulators can be used for the energy storage 21.
  • electrolytic capacitors 21 as energy storages will be charged to the bus voltage of about 40 V while electrical double layer capacitors would be charged to a maximum voltage of about 5 V (due to their construction, physical properties). Special types are available with 9 V, 12 V or even 15 V, but at cost of capacitor size with increasing voltage.
  • an electrolytic capacitor needs more space in comparison to the electrical double layer capacitor due to the high voltage.
  • the electrical double layer capacitor is much smaller, but an additional charging circuitry might become necessary.
  • the main limiting factor is the available bus current to charge the capacitor 21 within the limits of the EN54-23 standard (0.5 s to 2 s) regardless of the used type.
  • the energy storage 21 There are mainly two possibilities how the energy storage 21 can be used. As supply of energy only for the above mentioned pulse duration, or as supply of energy for the whole time of alerting.
  • the energy storage 21 is used as in case of a self-oscillating regulator so that the peak current through the string of LEDs 13 is fixed and the effective luminous intensity/illuminance can be set indirectly by the pulse duration.
  • the peak current through the string of LEDs 13 can be directly set as a duty cycle.
  • the pulse duration can be set.
  • a PWM controlled regulator allows more flexibility in relation to an adjustable light output, but adds complexity to the circuit.
  • the LED driver 19 has to ensure a constant power output. Mainly variations in input voltage and LED current dependency have to be compensated.
  • Temperature compensation can be achieved with the help of a NTC, if desired.
  • the pulse period can be based on a 0.5 s watch timer period with the help of a coded counter handling.
  • the first pulse can be done e.g. 0.5 s delayed with respect to the synchronization. All further pulses will follow with a period of a multiple of 0.5 s (1 s, 1.5 s, 2 s).
  • a timer output can be used. This ensures constant pulse duration independent of controller usage and will therefore not be interrupted, e.g. by a high prioritized bus communication.
  • the timer is started by program.
  • EEPROM electrically erasable programmable read-only memory
  • This value is set / calculated and saved in the memory or storage unit like e.g. an EEPROM during manufacturing and can be rewritten at need, either through a dedicated bus command or by a special calibration apparatus to be connected with the VAD.
  • the VAD will be configured by corresponding values given in the device class as discussed at the beginning of the description. These values as well will be stored in the storage unit in a customer data block and might be re-written by a dedicated bus command or during installation.
  • a load factor i.e. the share of the load on the bus attributed to the VAD, will be calculated taking calibration and configuration values into consideration.
  • the calculated value is used to set the current limiter 29 and to control an LED driver 19.
  • the VAD will be deactivated by a further bus command on the bus.
  • the VAD will stop action at once.
  • the VAD is connected between the two wires of a bus 23.
  • a bus line is connected with the input of a main current limiter 29.
  • the main current limiter 29 is connected with a charging unit 25 which in turn is connected with an energy storage 21 respectively a capacitor.
  • the other side of the capacitor 21 is connected with the other bus line.
  • the VAD comprises furthermore the LED driver 19 and a series of LEDs 13, connected in series between the one side of the capacitor 21 and the second bus line.
  • the VAD of Fig. 4 furthermore comprises a main controller unit 27 for controlling the current limiter 29, the charging unit 25 and the LED driver 19. Additionally, if the VAD is intended to be used as an acoustic alarm device as well, a piezoelectric sound element 11 and a corresponding second capacitor 33 can be provided.
  • the LEDs 13 will be powered by the energy stored in the energy storage 21 respectively the capacitor.
  • the energy storage 21 is charged through the charging unit 25, receiving the current from the main current limiter 29, which in turn receives the respective current through the bus 23.
  • Controller 27 controls the charging unit and the LED driver 19 depending on the actual values indicating the configuration of this particular VAD, stored in the storage unit or memory therein. That is, if the VAD is intended to cover a large area, the energy stored in the capacitor 21 might be used completely during one flash emission of light by the LED 13. In this case, the charging unit 25 and the main current limiter 29 will be controlled by the controller 27 so as to draw a large amount of current from the bus 23 in order to charge the capacitor 21 in the time between two pulses of the alarm.
  • the capacitor 21 will not be depleted completely during a flash, and therefore, a smaller current will be enough to recharge the capacitor 21.
  • the capacitor 21 is intended to cover not only one flash but the entire alarm duration time of several minutes.
  • the configuration shown in the figure has different capacitors for powering the sound alarm and the light alarm. This helps to avoid the problem that the intensive light alarm will influence the sound emission, since during the light alarm a lot of power is needed to power the LEDs 13.
  • Another aspect of the invention is that at the beginning, when powering up the bus 23 the first time, all capacitors 21 of all VAD devices connected with the bus 23 will be empty. This means that simultaneously all capacitors 21 will try to charge. Due to the current limiter 29 provided with the VADs it can be ensured that even in this case the maximum allowed current of the bus 23 is not exceeded.
  • a DC/DC-converter 35 is provided in the VAD so as to allow the controller 27 to be operated at a low voltage 3.3 V for example.
  • Fig. 5 shows a slightly different configuration of the VAD of the invention.
  • a fault defect indication system can be implemented by the last LED 13 of the LED chain and the controller 27.
  • the controller 27 is provided with a sensing input monitoring the voltage on the line connecting the current limiter 29 and the charging unit 25.
  • This sensing input of the controller 27 is connected with the line connecting the charging unit 25 and the LED driver 19. Depending on the respective values detected by the sensing input, the LED will be powered or not.
  • Fig. 6 shows in detail a configuration of a current limiter 29 which can be used in connection with the present invention.
  • the current limiter 29 in this embodiment comprises a series connection of a resistor 29 and the power transistor 41.
  • the voltage drop of the resistor 41 is monitored by a dedicated monitoring circuit 43, which will provide an output to be supplied to the base, respectively the gate 45, of the transistor 41 so as to control the operating state of this transistor 41.
  • the monitoring circuit 43 in turn will receive a threshold value from the controller 27, which will be used to determine the operation of the monitoring circuit 43 for setting the current limit of this current limiter 29.
  • the monitoring circuit 43 controlling the operating state of the power transistor 41 is supplied with the output signal of a variable reference current setting unit 47, which in turn is controlled by the controller 27 of the VAD.
  • the variable reference current limit setting unit 47 will control the base/gate voltage of the power transistor depending on the voltage drop across the resistor in comparison with the variable reference values set by the controller 27 or the storage unit.
  • Fig. 7 shows an alternative configuration of the current limiter 29.
  • This current limiter comprises a plurality (three) of current limiter circuits connected in parallel.
  • Each current limiter circuit comprises a resistor 39 and a switching transistor 41 connected in series.
  • the bases/gates of the transistors 41 of all current limiting circuits can be controlled in a similar way by a controller 27, supplying switching signals to a dedicated one, or two (or all gates) of all transistors.
  • the current limiter configured by three series connections of resistors and transistors - as shown in Fig. 7 - can be controlled so as to either block the current entirely, to open a first current path through the first resistor and transistor, to open a second current path to the second resistor and transistor and/or to open a current paths through the third resistor and transistor.
  • different charging currents can be implemented for charging a capacitor connected with this circuit.
  • the controller 27 will be programmed depending on the actual intended location and use of the VAD so as to claim only a small part of the bus current (first current path), a medium size part of the bus current (first and second current path) or a large part of the bus current (all three current paths), depending e.g. on whether the VAD is intended for a room height of 3, 6 or 9 m respectively.
  • each VAD can be configured to comprise more than one current limiter, for example one current limiter can be used to limit the current for the current for charging the capacitor connected to a first and a second load, a second current limiter 53 can be used to charge a second capacitor connected to power a third and fourth load.
  • the first and second load for example can be the LEDs, whereas the third and fourth load can be electric elements.
  • the current limit implemented by the current limiter might be temporarily changed through a dedicated bus command. For example, in a testing environment, one VAD is tested, while the other VADs of the bus system remain idle. In his case the current limit of the tested VAD can be set to a higher value after the test, since only one of the VADs will need charging. Once the VAD is charged, the testing can proceed to the next VAD of the bus.
  • controller 27 controls the visual alarm element so as to emit the visual alarm signal in response to an electric alarm signal supplied through a bus.
  • the visual alarm signal should have a minimum luminous flux level within one of a plurality of predetermined alarm regions of a given dimension.
  • the storage unit stores at least one set of operation setting values for the controller 27 to control the visual alarm element. Each set of operation setting values can be predefined depending on the dimensions of the predetermined alarm region.
  • Each set of operation setting values may comprise at least one of a value for the duty ratio of the visual alarm element, an electrical power level of the visual alarm element, and time value for a flash of the visual alarm element.
  • the visual alarm element can include a selecting unit, e.g. a manually operated switch, for selecting one set of operation setting values.
  • a selecting unit e.g. a manually operated switch
  • the storage unit can be configured as a write protected storage unit (EEPROM) storing only one set of operation setting values.
  • EEPROM write protected storage unit
  • This VAD can be configured so as to allow an easy exchange of the storage unit.
  • the controller 27 can be configured to transmit data via the bus, the data can be representative for the selected set of operation setting values, so as to allow the central control panel of the system to operate the system depending on all received sets of operation setting values.
  • the visual alarm device comprises a plurality of LEDs or other light emitting devices for emitting light into a plurality of directions.
  • the controller 27 is configured so as to control the operation of the plurality of LEDs.
  • the controller 27 controls at least one of the plurality of operation parameters of at least two of the plurality of LEDs so as to have different values and so that the respective LEDs emit different amounts of light. By doing so, the form of the coverage area can be varied without wasting power.
  • At least one of the plurality of operation parameters is one of a duty cycle and a maximum electric power of the LED.
  • At least one of the plurality of LEDs is provided with dedicated means 15, 17 for guiding the emitted light into a predetermined area.
  • the storage unit can be used to store data representative of the operation parameters.
  • the storage unit can preferably be overwritten by a bus command received through the bus 23.
  • the respective LEDs of the plurality of LEDs can be controlled, so that less energy is supplied to those LEDs illuminating the area immediately below the visual alarm device, compared to those LEDs illuminating the surrounding.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)

Claims (7)

  1. Dispositif d'alarme visuelle pour un système d'alarme connecté à un bus, le dispositif d'alarme visuelle étant à connecter audit bus (23) fournissant l'alimentation et des ordres au dispositif d'alarme visuelle, le dispositif d'alarme visuelle comprenant :
    au moins un élément d'alarme visuelle pour émettre un signal d'alarme visuelle à une cadence de clignotement de 0,5 s à 2 s ;
    le signal d'alarme visuelle ayant un niveau de flux lumineux minimal au sein de l'une d'une pluralité de régions d'alarme prédéterminées d'une dimension donnée,
    au moins un dispositif de commande (27) pour commander l'élément d'alarme visuelle de façon à émettre le signal d'alarme visuelle en réponse à un signal d'alarme électrique fourni par le biais d'un bus (23) ;
    une unité de stockage stockant au moins deux jeux de valeurs de réglage de fonctionnement pour que le dispositif de commande (27) commande l'élément d'alarme visuelle ;
    chaque jeu de valeurs de réglage de fonctionnement étant prédéfini selon les dimensions de la région d'alarme prédéterminée.
  2. Dispositif d'alarme visuelle selon la revendication 1, dans lequel
    chaque jeu de valeurs de réglage de fonctionnement comprend au moins l'une d'une valeur pour le facteur de marche de l'élément d'alarme visuelle, un niveau de puissance électrique de l'élément d'alarme visuelle, une valeur de temps pour un clignotement de l'élément d'alarme visuelle, et une forme de forme d'impulsion.
  3. Dispositif d'alarme visuelle selon la revendication 1 ou 2, dans lequel
    l'élément d'alarme visuelle comprend une pluralité de DEL (13) connectées en série.
  4. Elément d'alarme visuelle selon l'une quelconque des revendications 1 à 3, comprenant en outre
    une unité de sélection pour sélectionner un jeu de valeurs de réglage de fonctionnement.
  5. Dispositif d'alarme visuelle selon l'une quelconque des revendications 1 à 4, dans lequel
    le dispositif de commande (27) est configuré pour transmettre des données via le bus (23), les données étant représentatives du jeu sélectionné de valeurs de réglage de fonctionnement.
  6. Dispositif d'alarme visuelle selon l'une quelconque des revendications précédentes, comprenant en outre :
    un condensateur (21) pour fournir l'alimentation à l'élément d'alarme visuelle pendant une alarme, ledit condensateur (21) étant connecté pour être chargé par le biais du bus (23).
  7. Dispositif d'alarme visuelle selon la revendication 6, dans lequel
    le condensateur (21) présente une capacité (C) pour stocker de l'énergie électrique, qui peut fournir l'alimentation à l'élément d'alarme visuelle au moins pendant un temps d'alarme prédéfini.
EP13186979.4A 2013-10-01 2013-10-01 Dispositif d'alarme visuelle Active EP2858046B1 (fr)

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EP2858046B1 true EP2858046B1 (fr) 2019-12-04

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GB2624678A (en) * 2022-11-25 2024-05-29 Apollo Fire Detectors Ltd Visual alarm device

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WO2011015975A2 (fr) 2009-08-05 2011-02-10 Koninklijke Philips Electronics N.V. Système de guidage de la lumière et procédé de commande associé
DE102010002940A1 (de) 2010-03-17 2011-09-22 Robert Bosch Gmbh Signalvorrichtung für eine Meldeanlage, Meldeanlage sowie Verfahren zum Betrieb der Signalvorrichtung
DE102011103242A1 (de) 2011-06-03 2012-12-06 Marco Systemanalyse Und Entwicklung Gmbh Eigensichere Leuchte
WO2012173771A1 (fr) 2011-06-14 2012-12-20 Simplexgrinnell Lp Dispositif stroboscopique à del à mode double

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Publication number Priority date Publication date Assignee Title
WO2003098565A2 (fr) 2002-05-13 2003-11-27 Edwards Systems Technology, Inc. Procede et appareil de reglage de sorties audibles et visuelles d'un dispositif d'alarme assemble
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