EP1006500A2 - Détecteur de fumée avec unité d'aspiration et capteur de débit - Google Patents

Détecteur de fumée avec unité d'aspiration et capteur de débit Download PDF

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Publication number
EP1006500A2
EP1006500A2 EP99309678A EP99309678A EP1006500A2 EP 1006500 A2 EP1006500 A2 EP 1006500A2 EP 99309678 A EP99309678 A EP 99309678A EP 99309678 A EP99309678 A EP 99309678A EP 1006500 A2 EP1006500 A2 EP 1006500A2
Authority
EP
European Patent Office
Prior art keywords
detector
sensor
filter
control circuit
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99309678A
Other languages
German (de)
English (en)
Other versions
EP1006500A3 (fr
Inventor
George A. Schoenfelder
Thomas Shoaff
Juliette C. Daly
Eric V. Gonzales
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pittway Corp
Original Assignee
Pittway Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pittway Corp filed Critical Pittway Corp
Publication of EP1006500A2 publication Critical patent/EP1006500A2/fr
Publication of EP1006500A3 publication Critical patent/EP1006500A3/fr
Withdrawn legal-status Critical Current

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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
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits
    • 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
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention pertains to ambient condition detectors. More particularly, it pertains to improvements in such detectors.
  • Ambient condition detectors have been found to be useful in providing an indication of the presence of the respective condition.
  • Smoke detectors have been found useful in providing early warnings of the presence of airborne particulate matter such as smoke.
  • Known smoke detectors often include a housing with an internal sensing region or smoke chamber. Either an ionization-type or a photoelectric-type smoke sensor can be located in the housing.
  • Vents are located in the housing. Ambient air circulates into and out of the housing in response to movement of the adjacent atmosphere.
  • Air circulation in a region being monitored does bring the airborne particulate matter into the housing. Depending on the nature of the air currents, this can be a faster or a slower process.
  • An aspirated detector includes at least one ambient condition sensor, such as a smoke or a gas sensor, which is in turn coupled to a control circuit.
  • the control circuit could be implemented, at least in part, as a programmed processor.
  • Read-write memory as well as read-only memory and electrically alterable programmable read-only memory can be coupled to the processor to provide storage for transient information, control programs or calibration information which might be subject to change either between units or as a function of time.
  • the detector can include a flow sensor coupled to the control circuitry.
  • the flow sensor could include, for example, at least one thermistor.
  • a second, reference, thermistor can be provided to null out temperature, aging, or ambient effects providing only an indication of flow.
  • the aspiration unit can incorporate a fan, centrifugal blower or pump configured to produce either positive or negative pressures so as to draw ambient air from outside of the detector into a sensing volume adjacent to the ambient condition sensor or sensors.
  • Operational temperature of the aspiration unit can be monitored via a temperature sensor.
  • One possible monitorable temperature is the air temperature at the outlet of the aspiration unit.
  • the output of one or more temperature sensors can be fed back to the control circuitry to provide another indication of detector operation.
  • the aspiration unit could be made small enough to fit within the smoke sensor chamber. If the unit is made small enough that it will not generate an appreciable pressure difference for the purpose of forcing ambient air into the sensing chamber, two approaches can be taken. First, the sensing chamber volume can be decreased until the aspiration unit's output volume becomes substantial enough to cause an inflow of ambient air into the chamber. Secondly, the intensity of the sensor can be increased and/or concentrated such that the sensing region is very small and the outlet of the aspirating mechanism is directly adjacent to the sensing region. For example, in a photoelectric smoke detector, the light producing element can be a focused laser diode rather than an LED. The aspirator outlet fan be directed at the focal point of the laser beam.
  • the control circuitry via drive circuits, can provide pulse modulated drive signals to an aspiration unit. Other types of modulation can also be used.
  • interface circuitry can be coupled to the control circuitry to enable the detector to communicate, perhaps via a communication link, to a remote system control unit.
  • Data pertaining to sensed ambient conditions as well as status information pertaining to the condition of the detector can be provided, via the interface circuitry, to the system control unit.
  • electrical energy for the purpose of energizing at least the aspiration unit can be provided via a separate power link from an auxiliary power supply which operates under the control of the system control unit.
  • the power supply for the aspiration unit can be incorporated into the detector.
  • the aspiration unit In normal operation, as set forth in the parent hereto, the aspiration unit is energized to bring ambient air into the sensing volume or chamber while the ambient condition sensor is active to respond to the presence of the selected condition to be sensed. Hence, the inflow of ambient air, produced by the aspiration unit, provides a higher concentration of the condition to be sensed sooner than would be the case if just the ambient air currents were present.
  • a flow parameter or parameters of the ambient air in the sensing volume as well as the temperature of the aspiration unit can be monitored by the local control circuitry.
  • Drive signals provided to the aspiration unit can be modulated in response to the monitored parameters.
  • Parameter monitoring can be simultaneous with ambient condition sensing or interleaved therewith. Signals from the ambient condition sensor can be filtered or processed.
  • the detector in one embodiment, can incorporate at least one, replaceable, filter.
  • the filter can, for example, be implemented as a planar element having one portion to filter inflowing ambient air and a second portion to filter outflowing ambient air from the sensing chamber.
  • the filter can be coated in whole or in part with a hydrophobic coating to resist moisture build up and clogging.
  • an impervious cover can be provided over the filter to protect it from directly incident streams of water or airborne moisture.
  • the replaceable filter can be combined with a permanent detector mounted filter.
  • the pore-size of the replaceable filter is selected to be smaller than or equal to the pore size of the permanent filter.
  • the replaceable filter can be changed in accordance with a predetermined maintenance schedule as it will tend to clog before the permanent filter does.
  • the permanent filter functions to prevent particulates from entering the sensing chamber of the detector.
  • the control circuitry can detect the presence of a filter that has been clogged to a predetermined degree by sensing a loss of flow of ambient air through the sensing chamber, or a temperature increase in the aspiration unit. That circuitry can, via the interface circuitry, communicate with the system control unit and transmit an appropriate status message. In yet another aspect, in response to a clogged filter or a failed aspiration unit, the local control processor can generate a local indicator. The ambient condition sensors could still be monitored by the local control circuitry and indicate via the interface circuitry any detected alarm conditions.
  • the local processor can carry out a calibration process in response to an initial power up after assembly. During this process, calibration information that was prestored during manufacture can be read by the processor and incorporated into the detector's control program for use after installation. If desired, the calibration information can then be erased.
  • a random delay in energizing a respective aspiration unit can be incorporated into each detector. This will minimize peak power demand needed to drive a plurality of aspiration units.
  • the detector can be part of a multi-processor communication system. Wired or wireless communication media can be used to communicate messages between devices.
  • the ambient condition sensor can be implemented as either a photoelectric or an ionization-type sensor.
  • Photoelectric sensors can incorporate a laser diode as a source of radiant energy. Other sources could be used.
  • Fig. 1 illustrates a block diagram of an alarm system 10.
  • the system 10 includes a common system control element 12 which could incorporate a programmed processor.
  • One exemplary medium 14 corresponds to an electric or optical cable.
  • a wireless medium could also be used.
  • the members of the plurality 16a could be ambient condition detectors, such as fire detectors, intrusion detectors or the like.
  • the members of the plurality 16b correspond to aspirated detectors with flow sensors.
  • the system 10 can also include an alarm indicating device bus 18 to which a plurality of audible and visual alarms such as horns, sirens or strobe lights 18a can be coupled.
  • the system 10 can also incorporate an auxiliary power supply 20 coupled to the control element 12.
  • the power supply 20 via an auxiliary power bus 20a can provide supplemental electrical energy to the members of the plurality 16b. It will also be understood that instead of a common auxiliary supply such as the supply 20, each of the members of the plurality 16b could be equipped with a local power supply which could be energized via batteries or local utility lines.
  • the members of the plurality 16b are substantially identical. A discussion of a representative member thereof, 16i, will also be applicable to the remaining members of the plurality.
  • the detector 16i includes a housing 30.
  • the housing 30 carries at least one ambient condition sensor, a smoke sensor 32a.
  • a variety of sensor structures can be used to implement the sensor 32a. The details of the structure of that sensor are not a limitation of the present invention.
  • the detector 16i can also incorporate at least one additional optional, ambient condition sensor 32b.
  • the sensor 32b could, for example, sense the presence of one or more selected gases.
  • carbon monoxide is a gas usually associated with a fire condition.
  • Various types of carbon monoxide or gas sensors are known and could be incorporated into the detector 16i. The details of the structure and operation of the sensor 32b are not a limitation of the present invention.
  • the outputs from the sensor 32a and/or 32b are coupled to control circuitry 34.
  • the circuitry 34 could be implemented using a programmed processor 34a.
  • Programs or instructions for the processor 34a can be stored in read-only memory 34b or electrically erasable read-only memory 34c.
  • Read-write memory 34d, coupled with the processor 34a, is available for temporary storage of data received from various sensors present in the detector.
  • the processor 34a is also electrically coupled to drive circuitry 36a.
  • the drive circuitry in turn is coupled to an aspirator 36b.
  • the aspirator could be implemented as a pump, fan or blower such as a centrifugal blower.
  • the aspirator 36b could be implemented as any other form of air moving device suitable to create either positive or negative pressures so as to cause ambient air to flow into a sensing region 32c associated at least with the smoke sensor 32a and/or the gas sensor 32b.
  • An optional temperature sensor 36c can be coupled to the aspirator 36b for the purpose of monitoring the temperature thereof during operation.
  • the temperature sensor 36c is in turn coupled to the processor 34a.
  • Flow into the sensing region 32c can be detected by a flow sensor 38a.
  • the flow sensor 38a can be implemented as a self-heating thermistor. Temperature variations therein due to a flow of ambient air thereacross due to aspirator 36b will be detectable by the processor 34a and can be used to control electrical signals provided to the aspirator 36b by drive circuits 36a.
  • a calibration value can be read off of thermistor 38a and stored in memory 34c for carrying out flow tests in the field.
  • the drive circuits 36a can provide modulated pulses, such as pulse width modulated pulses, to intermittently energize the aspirator 36b.
  • modulated pulses such as pulse width modulated pulses
  • a reference sensor 38b which could be a second thermistor, can be coupled to the processor 34a to null out any non-flow variations. These variations include, without limitation, temperature variations or aging which might affect the output of the flow sensor 38a.
  • the sensing thermistor 38a is normally not energized.
  • the aspirator 36b and thermistor 38a are both energized.
  • the output from thermistor 38a can then be sensed at processor 34a and compared to a prestored calibration constant stored in memory 34c. Any substantial deviation from the prestored value is indicative of a change in air flow.
  • the thermistor 38a can be de-energized. Drive circuits 36a can resume their energy saving intermittent energization of the aspirator 36b.
  • Interface circuits 40 coupled to the processor 34a enable the detector 16i to carry out bidirectional communications, via the link 14 with the control element 12.
  • a variety of communications protocols could be implemented on the link 14 without departing from the spirit and scope of the present invention.
  • circuits 40 could include an RF transceiver.
  • the EEPROM 34c can be, if desired, used to store calibrated threshold information for use in analyzing output signals from the flow sensor 38a alone or in combination with reference sensor 38b. It will be understood that the processor 34a can be implemented with any one of a variety of commercially available programmable control processors without departing from the spirit and scope of the present invention. The exact details of the processor 34a, ROM memory 34b, EEPROM memory 34c and read-write memory 34d are not limitations of the present invention.
  • Figs. 2A and 2B illustrate different views of a representative member of the plurality 16b, such as the detector 16i.
  • Fig. 2A a side elevational view, partly in section, illustrating various inter-relationships of the elements of the detector 16i.
  • Fig. 2B an exploded, side elevational view, partly in section, illustrates additional details of the detector 16i.
  • the housing 30 surrounds and contains ambient condition sensing elements, such as the smoke sensor 32a or alternately gas sensor 32b.
  • the processor 34a as well as associated storage circuitry 34b, c, d are all carried on and interconnected by a printed circuit board 40.
  • the ambient condition sensing elements such as 32a and 32b, are received within a surrounding skirt 30a.
  • the detector 16i can removably engage a base 30b.
  • the base 30b can be of a type which is intended to be attached to a ceiling or other mounting surface.
  • the link 14 as well as the supplemental power link 20a can be coupled to each of the respective detectors, such as the detector 16i through the mounting bracket or base 30b.
  • the housing 30 carries a non-replaceable filter element 42a.
  • the aspirator 36b which could be a centrifugal blower, draws in adjacent ambient atmosphere through a portion of the filter 42a into the sensing chamber 32c and in turn expels ambient air in the sensing chamber through another portion of the filter portion 42a.
  • a replaceable filter 42b overlays the permanent filter 42a.
  • the replaceable filter 42b is selected so as to have pore sizes that are the same as or smaller than the permanent filter 42a.
  • the cover 30c provides input and output ports for ambient air being drawn into and expelled from the sensing chamber 32c.
  • Figs. 3A, 3B and 3C illustrate further details of the replaceable filter 42b.
  • the filter 42b is formed with a planar generally circular frame 46a.
  • the frame 46a includes a plurality of region-defining elements 46b-1, -2, -3 and -4.
  • the frame 46a carries and supports a generally cylindrical filter element 48.
  • the filter element 48 can be formed of a nylon mesh having openings on the order of 25 micrometers.
  • the interwoven threads of the mesh can be treated with a hydrophobic coating.
  • Exemplary types of coatings include silicon or fluorinated carbon coatings. The coating will promote beading or rolling off of water droplets which come in contact with the element 48 thereby minimizing adherence to and ultimately clogging of the pores thereof.
  • a variety of materials can be used to form the element 48 depending on environmental considerations.
  • a magnetized metal mesh filter can be used in environments having airborne metallic dust.
  • Fig. 3B a side elevational view of the replaceable filter 42b, illustrates further details of the frame 46a.
  • the filter 42b defines a single contiguous inlet region 50a and a plurality of spaced-apart exhaust regions 50b.
  • the regions 50a and 50b are demarcated from one another by the elements 46b-1,-2, -3 and -4.
  • FIG. 4A an enlarged side sectional view of the detector 16i, illustrates exemplary air flow therein in response to activation of the centrifugal blower 30b. It will be understood that other configurations of flow are possible without departing from the scope and spirit of the present invention.
  • the cover 30c protects the filters 42a, b from any high velocity air or water streams directly incident upon the detector 16i.
  • the cover 30c also provides a torturous path for atmosphere both entering and exiting the sensing region 32c of the detector thereby aiding in the filtration process.
  • the cover 30c in part defines an inlet region 52a which circumferentially surrounds the housing 30. Ambient air brought into the inlet region 52a travels along the interior of the cover 30c to the central inlet region 50a of the filter 42b.
  • the interior of the cover 30c carries partitions, illustrated in Fig. 4A as partition 30c-1; which conform to the filter dividing elements 46b-1, -2, -3 and -4. These partitions form a manifold which segregates inlet air being taken via the circumferential slot 52a from outflowing air.
  • the circumferential slot 52a can be divided into inflow and outflow regions, consistent with the partitions, such as the partition 30c-1 in the interior of the cover 30c to provide inflow ports and separate outflow ports for the inflowing and outflowing ambient atmosphere.
  • Fig. 4B illustrates detector 16i in section and rotated 90° relative to the view of Fig. 4A. This view illustrates ambient air outflow from the sensing region 32c from exhaust ports on the circumferential opening 52a.
  • the circumferential slot 52a can, alternatively, be configured as a single continuous circumferential port whereat inflowing ambient and outflowing ambient respectively enter and leave the detector simultaneously. In the latter instance, there is a possibility of intermixing of inflowing and outflowing ambient. This intermixing does not have any substantial effect on the performance of the detector.
  • the cover 30c also carries drainage openings indicated as 30c-2.
  • the intent of the openings 30c-2 is to provide orifices from which moisture can drain from a respective detector. In normal operation and with a normal orientation, the cover 30c can be expected to be at a lower elevation, or below, the skirt 30a thereby promoting drainage.
  • the circumferential slot 52a can be used as an input port for drawing ambient air into the sensing chamber 32c.
  • Separate outflow paths could be provided at the base of the housing 30 adjacent to the decorative skirt 30a. This arrangement would provide unidirectional flow through the sensing chamber and then out through the base of the housing. Other configurations are also possible.
  • Fig. 5A is an enlarged side sectional view of another configuration of a detector 60 usable with the system 10 of Fig. 1.
  • Detector 60 exhibits an air flow unlike that of the detection 16i of Figs. 4A, 4B.
  • the detector 60 includes a cylindrical housing 30-1.
  • the housing 30-1 is closed with a cover 30-1c.
  • An annular inlet channel, or port, 62 surrounds the intersection of the housing 30-1 and the cover 30-1c.
  • a flow diagram of operation of exemplary detector 16i includes a plurality of calibration/setup steps 100, a plurality of steps 102 illustrative of normal operation, a plurality of steps 104 illustrative of processing in the presence of malfunctions, nonfunctions or trouble conditions, and a plurality of steps 106 illustrative of air flow monitoring of the aspiration unit 36b.
  • a step 120 the aspiration unit 36b would be energized.
  • a step 122 outputs from the reference and sensing thermistors 38a, 38b would be measured and representative parameter values established and stored in programmable memory 34c.
  • a step 124 a random fan or aspiration unit power up delay is created. That delay value could also be stored in programmable memory 34c.
  • prestored calibration information can be erased.
  • the respective detector for example the detector 16i, would be installed in a system such as the system 10.
  • the pre-established and prestored random delay interval would be permitted to lapse before energizing the aspiration unit or fan 36b.
  • a respective fan or aspiration unit 36b would be energized for a predetermined time interval such as five seconds.
  • a step 142 during this interval, continuity of the fan or aspiration unit circuitry is verified by processor 34a in a step 142. If in a step 144 no open or short circuits are detected, the fan or aspiration unit 36b will be de-energized for 30 seconds in a step 146.
  • a step 148 the duration of time since air flow has been monitored is compared to a predetermined interval such as four hours. If the time has not exceeded the preset interval, the aspiration unit or fan is again energized in the step 140.
  • a step 152 the number of such detects is compared to a preset value, such as three consecutive times. If the open or short circuit has not been detected in the step 152 for the requisite number of times, the aspiration unit or fan is again de-energized in the step 146. If however the open or short circuit condition has been detected for the requisite number of times, in a step 154, a predetermined trouble signal, discussed subsequently, can be generated for use by common control unit. Subsequent to generating the trouble signal, in a step 156, a predetermined interval is permitted to elapse before retesting continuity and verifying the operation of air flow circuitry in a step 158.
  • a preset value such as three consecutive times.
  • step 148 the air flow monitoring steps 106 will be executed.
  • aspiration unit 36b which could be implemented as a fan, and air flow sensing circuitry 38a, b are energized for a predetermined time interval, such as 15 seconds.
  • a predetermined time interval such as 15 seconds.
  • outputs from the flow sensing element 38a and reference element 38b are read. If those values do not fall within a predetermined range, stored for example in programmable memory 34c, the detector will return to normal operation, steps 102, for a predetermined time interval such as one hour.
  • step 104 in a step 178 a correlation is established between reference sensing elements 38b and the ambient temperature, which could be detected off of a selected temperature sensor carried by the respective detector.
  • a flow trouble threshold is established based on the sensed ambient temperature. If in a step 182, the output from the sensing element 38a has fallen below the threshold established in the step 180, the number of times this condition has been detected is compared in a step 184 to a predetermined value such as three times. If so, a trouble signal is generated in the step 154. If not, the aspiration unit 36b is de-energized for a preset time interval in a step 186. Subsequently, the unit is re-energized in this step 170.
  • the control circuitry 34a must allow for a fail-safe response to a number of occurrences in the field, such as a clogged filter, a broken fan, an open or short circuit, etc. In the process of Fig. 6, all of these field occurrences are communicated by a trouble signal to the control 12 for the respective aspirated detector. There are a variety of ways to produce a trouble signal, none of which is a limitation of the present invention.
  • One method is to produce a trouble signal at the control 12 by cutting the power loop between the detector and the panel using a switch at the detector. This method can be implemented by cutting power permanently, or cutting and restoring power intermittently to maintain smoke sensing ability and to discriminate between types of field occurrences.
  • trouble signal intervals There are a variety of trouble signal intervals that can be implemented, which may be based on the frequency of monitoring by control 12. For example, the intervals can be spaced to produce signals during various work shifts (i.e., every 3-7 hours), across several days (i.e., every 17-23 hours), or regularly (i.e., every 0.5-1 hours).
  • a trouble signal at the control 12 can also be generated by altering one of the detector's output signals so that power is maintained continuously, but the control 12 reads a deviation from normal output signals. This can also be achieved using a remote device connected within the medium 14 between the detector and the panel.
  • the aspiration module 36b may run off of an auxiliary power supply 20, separate from the control 12 power supply to the detector, the detector power source from the control 12 to the auxiliary power supply 20 can be switched in the event of a trouble condition. This way, the medium 14 to the control 12 is disconnected so the control 12 generates a trouble signal, but the detector is still powered (by the auxiliary power supply) so as not to lose smoke sensing ability. In the event of a fire during this condition, the medium 14 can be restored so the fire condition can be communicated through the control 12.
  • auxiliary alarm such as an annunciator or a visual display, either attached to the detector or the control 12, or remote from both.
  • the trouble switch can be connected between the detector and the auxiliary alarm rather than the control 12.
  • the alarm could sound in different patterns or indicate different visual signals to discriminate between field occurrences.
  • a visual display could show the air flow readings and indicate how close the readings are to the trouble threshold; perhaps the characters could turn colors to indicate pre-alarm states.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
EP99309678A 1998-12-04 1999-12-02 Détecteur de fumée avec unité d'aspiration et capteur de débit Withdrawn EP1006500A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US205440 1980-11-10
US20544098A 1998-12-04 1998-12-04

Publications (2)

Publication Number Publication Date
EP1006500A2 true EP1006500A2 (fr) 2000-06-07
EP1006500A3 EP1006500A3 (fr) 2001-04-11

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EP99309678A Withdrawn EP1006500A3 (fr) 1998-12-04 1999-12-02 Détecteur de fumée avec unité d'aspiration et capteur de débit

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EP (1) EP1006500A3 (fr)
JP (1) JP2000172964A (fr)
CN (1) CN1256411A (fr)
AU (1) AU6314499A (fr)
CA (1) CA2291203A1 (fr)

Cited By (32)

* Cited by examiner, † Cited by third party
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WO2002067217A1 (fr) * 2001-02-16 2002-08-29 Axel Kretzschmar Procede et dispositif pour surveiller des installations souterraines
WO2002095705A1 (fr) * 2001-05-23 2002-11-28 Minimax Gmbh Systeme de detection d'incendie a auto-aspiration
WO2003069571A1 (fr) * 2002-02-15 2003-08-21 Vision Products Pty Ltd Detecteur ameliore
GB2401468A (en) * 2003-05-07 2004-11-10 Edwards Systems Technolgy Inc Ambient condition detector with multiple sensors and a single control unit
WO2004102499A1 (fr) 2003-05-14 2004-11-25 Vision Fire & Security Pty Ltd Appareil et procede de detection amelioree
EP1524404A2 (fr) * 2003-10-09 2005-04-20 Industrie Elektronik Brandenburg Gmbh Procédé et dispositif pour la surveillance de bâtiments
DE10125687B4 (de) * 2001-05-25 2005-06-16 Wagner Alarm- Und Sicherungssysteme Gmbh Vorrichtung zum Detektieren von Brandherden oder Gasverunreinigungen
DE102008024085A1 (de) * 2008-05-17 2009-11-26 Eidmann, Jürgen Feuerschutzabsperrvorrichtung
WO2011098773A1 (fr) * 2010-02-11 2011-08-18 Thorn Security Limited Dispositifs de détection
US8015873B2 (en) 2008-04-25 2011-09-13 Hall David L Detector housing
EP2270762A3 (fr) * 2009-06-29 2012-01-04 ista International GmbH Détecteur de fumée et procédé de contrôle des impuretés sur les ouvertures de passage des fumées
EP2407946A1 (fr) * 2010-07-15 2012-01-18 Siemens Schweiz AG Détection d'encrassements et de ruptures dans un détecteur de fumées par aspiration (ASD)
US8141422B2 (en) 2008-04-25 2012-03-27 Hall David L Detector housing
EP2469492A1 (fr) * 2010-11-29 2012-06-27 Minimax GmbH & Co. KG Procédé et dispositif destinés à la détection d'incendie dans des volumes
EP2624229A1 (fr) * 2012-02-06 2013-08-07 Robert Bosch Gmbh Mesure du flux d'air permettant de contrôler l'état de bon fonctionnement d'un détecteur de type chambre à fumée.
FR3000268A1 (fr) * 2012-12-21 2014-06-27 Finsecur Dispositif de detection de fumee
GB2513854A (en) * 2013-05-04 2014-11-12 Protec Fire Detection Plc Improvements in and relating to aspirating smoke detectors
EP2857928A1 (fr) * 2013-10-01 2015-04-08 Novar GmbH Dispositif d'alarme à bus couplé
CN105148643A (zh) * 2015-06-29 2015-12-16 姜和信 布袋除尘器布袋堵塞的在线检测方法
EP2595132A3 (fr) * 2011-11-17 2016-09-14 Hekatron Vertriebs GmbH Dispositif d'alarme
EP3534346A1 (fr) * 2013-10-04 2019-09-04 Tyco Fire & Security GmbH Détecteur de conduit à capacité de test de passage de flux d'air à distance
US10508966B2 (en) 2015-02-05 2019-12-17 Homeserve Plc Water flow analysis
US10704979B2 (en) 2015-01-07 2020-07-07 Homeserve Plc Flow detection device
US10739323B2 (en) 2017-10-17 2020-08-11 Pierre Desjardins Interconnecting detector
EP3843057A1 (fr) * 2019-12-23 2021-06-30 Carrier Corporation Détecteur de points pour système d'alarme incendie
CN113160514A (zh) * 2020-01-22 2021-07-23 中移物联网有限公司 一种风道式烟感***
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US10739323B2 (en) 2017-10-17 2020-08-11 Pierre Desjardins Interconnecting detector
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US11783688B2 (en) 2018-03-13 2023-10-10 Carrier Corporation Aspirating detector system
EP3843057A1 (fr) * 2019-12-23 2021-06-30 Carrier Corporation Détecteur de points pour système d'alarme incendie
US11244551B2 (en) 2019-12-23 2022-02-08 Carrier Corporation Point detector for fire alarm system
CN113160514A (zh) * 2020-01-22 2021-07-23 中移物联网有限公司 一种风道式烟感***
US11609144B2 (en) 2020-05-08 2023-03-21 Carrier Corporation Detection of leakage in an aspirating fire detection system
EP4092645A1 (fr) * 2021-05-18 2022-11-23 Siemens Schweiz AG Augmentation de la puissance d'aspiration pour un détecteur de fumée par aspiration (asd) permettant de réduire le temps de transport à une valeur de niveau de signal minimum détecté sans émettre de message d'interruption
US11704987B2 (en) 2021-05-18 2023-07-18 Siemens Schweiz Ag Increasing the suction power in an aspirating smoke detector (ASD) to shorten the transport time from a detected minimum signal level value without the output of an interruption signal
US20220401776A1 (en) * 2021-06-21 2022-12-22 Carrier Corporation Operating an aspirating fire detector system
EP4246483A1 (fr) 2022-03-18 2023-09-20 Siemens Schweiz AG Détecteurs d'incendie à thermistances non chauffées, en particulier ntcs, destinés à la détection des fluctuations thermiques dans la zone des ouvertures d'entrée, ainsi que procédé correspondant
WO2024145335A1 (fr) * 2022-12-29 2024-07-04 Ademco Inc. Détecteur de danger à module détecteur remplaçable

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JP2000172964A (ja) 2000-06-23
AU6314499A (en) 2000-06-08
CN1256411A (zh) 2000-06-14
EP1006500A3 (fr) 2001-04-11

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