EP1413998A2 - Dispositif pour la reconnaissance de noyaux de feux couvants - Google Patents

Dispositif pour la reconnaissance de noyaux de feux couvants Download PDF

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Publication number
EP1413998A2
EP1413998A2 EP03023055A EP03023055A EP1413998A2 EP 1413998 A2 EP1413998 A2 EP 1413998A2 EP 03023055 A EP03023055 A EP 03023055A EP 03023055 A EP03023055 A EP 03023055A EP 1413998 A2 EP1413998 A2 EP 1413998A2
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EP
European Patent Office
Prior art keywords
displacement body
sleeve
delivery line
sensors
section
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.)
Granted
Application number
EP03023055A
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German (de)
English (en)
Other versions
EP1413998A3 (fr
EP1413998B1 (fr
Inventor
Dirk Lorenz
René De Vries
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.)
Forschungsgesellschaft fur Angewandte Systemsicherheit und Arbeitsmedizin
Original Assignee
Forschungsgesellschaft fur Angewandte Systemsicherheit und Arbeitsmedizin
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
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Publication of EP1413998A2 publication Critical patent/EP1413998A2/fr
Publication of EP1413998A3 publication Critical patent/EP1413998A3/fr
Application granted granted Critical
Publication of EP1413998B1 publication Critical patent/EP1413998B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Definitions

  • the invention relates to a device for detecting smoldering nests in a pneumatic delivery line.
  • such devices comprise a displacement body which is elongated in the flow direction of the delivery line, which is arranged in the delivery line and has at least one IR sensor for detecting smoldering nests.
  • glow nests can form under certain circumstances and conditions. Smoldering nests are clumps of the combustible or flammable dust-like components present in the mixture, which can heat up to several hundred degrees Celsius as a result of chemical reactions inside. The outer layers of such glow nests, on the other hand, consistently show temperatures below 100 ° C.
  • Smoldering nests can cause dangerous and devastating dust explosions.
  • dust explosions occur usually in such a way that the glow nests from the pneumatic conveying line, in which mostly no explosion can occur due to the high dust concentration, are introduced into silos or other parts of the plant and break open there.
  • silos or parts of the plant there are generally explosive dust-air mixtures which can be caused to explode by a bursting glow nest and the embers exposed in the process.
  • the consequences of such an explosion, which is caused by the bursting of smoldering nests are often devastating and can include high property damage, injuries and deaths.
  • the detection of CO in pneumatic conveying lines is not possible for technical reasons. Therefore in this case, hot objects are detected based on their infrared emission.
  • the detection systems known from the prior art consistently use several infrared-sensitive sensors, for example photoconductors made of lead sulfide, so-called PbS sensors, which are integrated in the tube wall of the pneumatic conveying line to be monitored in the form of a measuring head of a detector so that they are connected to it Look into the pipeline for infrared-sensitive areas of vision. Glow nests flying past the detectors emit heat radiation, which is registered by the detectors or PbS sensors and causes a change in resistance in them. This change in resistance leads to a change in current or voltage, which represents the measurement signal, which is amplified and further processed electronically.
  • a first disadvantage lies in the arrangement of the sensors in the pipe wall, which has the consequence that the IR radiation emitted by the glow nests in the direction of the sensors absorbs from the conveyed product due to the too long path length to be penetrated at higher than the above-mentioned product loads in the conveying pipe is and the sensors are not reached.
  • a second disadvantage is that by installing the sensors in the pipe wall, the sensors become less sensitive or even go blind due to dust deposited on the pipe wall. This is caused by the fact that the flow velocity in the delivery line on the pipe wall is lower than in the center.
  • a third disadvantage of common detection systems is given by this; that in these glass components are often perpendicular or oblique to the direction of the product flow conveyed in the delivery line. This can lead to glass breakage as a result of head-on collisions of these glass parts with solid bodies entrained in the flow, which entails a costly shutdown and repair.
  • a fourth disadvantage of known detection devices generally consists in the fact that they can only recognize objects (also due to the distance of the sensors from the glow nests) that have a surface temperature of more than 250 ° C. As mentioned at the beginning, however, glow nests show in most cases surface temperatures below 100 ° C, so that a higher sensitivity the detection device is required for reliable detection of the glow nests.
  • Document DE 4304890 A1 discloses a generic device for recognizing mica nests in a pneumatic delivery line, which comprises an elongated displacement body which is arranged in the delivery line and has one or more IR sensors for detecting mica nests.
  • the disadvantages described above are partially eliminated. Due to the arrangement of the IR sensors on a displacement body in the delivery line, the average distance to the glow nests flying past is reduced and, at the same time, the pollution problems caused by deposits on the pipe wall are reduced.
  • a device for detecting hot particles in a mass flow is known from document US Pat. No. 3,824,392, in which a light-sensitive sensor is seated in a dome-shaped, translucent spherical cap.
  • the calotte serves to protect the light sensors that are embedded in the tube wall. For this reason, the calotte is arranged on the inner tube edge.
  • a disadvantage of this known device is that the spherical cap tends to become soiled because it is arranged in the region of the tube wall, where the flow velocity is low, and is also unfavorably oriented transversely to the direction of flow.
  • a light-transmitting rod for a spark detector is known from document DE 691 24 165 T2.
  • the light-conducting rod transmits IR radiation to an IR sensor and is closed at one end with an IR-permeable quartz glass disk.
  • the invention is based on the object of providing a device for detecting glow nests in which the IR sensors are arranged in such a protected manner that permanent, reliable operation is made possible.
  • the device should enable safe operation both with regard to the contamination and deposit problems and with regard to possible damage to the sensors or glass parts.
  • a device for detecting glow nests in a pneumatic delivery line, comprising a displacement body which is elongated in the flow direction of the delivery line and which is arranged in the delivery line and has at least one IR sensor for detecting glow nests, thus comprises a displacement body which has a flow direction of the delivery line has elongated sleeve which is IR-transparent at least in some places, the IR sensors being arranged in the interior of the sleeve at IR-transparent points on the sleeve.
  • the inventive arrangement of the IR sensors inside an IR-permeable sleeve protects the IR sensors from dirt and damage.
  • the sleeve itself is protected from deposits due to its longitudinal arrangement in the direction of flow, in particular if it has an outer surface that is as smooth and flat as possible. In this way, a reliable arrangement of the IR sensors on a displacement body in the delivery line can be achieved.
  • the sleeve can be provided on the outside with mounts or covers, for example if special protective measures are required due to high pressures or large solid bodies conveyed in the delivery line. However, it is preferred if the sleeve forms the radial outside of the displacement body, ie it no longer has an outside cover. In this case, the elongated arrangement of the sleeve, which is as smooth as possible, provides optimal protection against deposits, dirt and damage to the sleeve and / or IR sensors.
  • the longitudinally displaced body has as few bumps on the outside as possible so that the flow in the pipeline is disturbed as little as possible.
  • the IR sensors are preferably arranged inside the sleeve.
  • the sleeve is not fitted with IR-permeable windows, but rather the sleeve is formed entirely from an IR-permeable material, because the outside of the sleeve which is as smooth as possible can thereby be achieved.
  • the displacement body or the sleeve in a device according to the invention not only serve to protect the IR sensors, but also have the task of disturbing the flow in the pipeline as little as possible by means of a favorable shaping and at the same time, due to shaping, alignment and placement in to achieve passive cleaning of the pipeline, which is based on the utilization of the high flow velocity in the middle of the pipe, the parallel alignment between the pipe axis and the sleeve axis, and the shape.
  • a device advantageously has a plurality of IR sensors which are arranged such that they are distributed over the circumference of the displacement body in such a way that their respective fields of view forming a sector around the displacement body cover the delivery line around the displacement body. This enables seamless monitoring of the space around the conveyor line.
  • the IR sensors can advantageously be offset from one another in the azimuthal and / or axial direction of the displacement body.
  • the number of IR sensors is advantageously between 3 and 10, preferably between 5 and 8.
  • IR sensors can also be provided for one sector. In this way, redundant monitoring can be carried out or, if one IR sensor fails, it can be switched to another.
  • a device for recognizing glow nests is created which enables reliable, permanent and sensitive detection of glow nests.
  • Another advantage of the invention is that it can be manufactured in a technically inexpensive manner and enables both simple installation in existing delivery lines and also inexpensive maintenance and repair.
  • the smoldering nest detection device comprises an elongated displacement body 3, which is arranged in the conveying line and has IR sensors 4 for detecting smoldering nests 1.
  • the delivery line 2 is wider in the area of the displacement body 3 reasons explained below.
  • the displacement body 3 is fastened to the tube wall of the delivery line 2 with a first holding device 5 and a second holding device 6 and is preferably arranged in the middle of the cross section of the delivery line 2. It comprises a sleeve 7 which is elongated in the direction of flow u of the delivery line and is IR-transparent at least in some places.
  • the IR sensors 4 are arranged in the interior of the sleeve 7 at IR-permeable points on the sleeve 7. At the front end 8 and at the rear end 9, the sleeve 7 is provided with streamlined closures.
  • the displacement body 3 is aerodynamically shaped.
  • the displacement body 3 is tapered at the front, upstream end 8 against the flow direction u, or if the displacement body 3 at the rear, downstream end 9 is tapered in the flow direction u.
  • the IR sensors are infrared-sensitive sensors, preferably photoconductors made of lead selenide or lead sulfide, so-called PbSe or PbS sensors. These IR sensors 4 react to the infrared radiation emitted by glow nests 1, and their signal is evaluated in order to detect glow nests 1 flying past.
  • the diameter d of the delivery line 2 is approximately 80 mm and the outer diameter of the displacement body 3 is approximately 25 mm.
  • the delivery line 2 is expanded in the area of the displacement body 3 to a diameter D of about 90 mm, so that the free cross-sectional area A (see 3) of the delivery line 2 is also available in the region of the displacement body 3 as a free cross section B (see FIG. 4) for the flow.
  • the distance between the wall of the delivery line 2 and the outer edge of the displacement body 3 is thus about 30 mm.
  • the length L of the expanded area of the delivery line 2 is approximately 300 mm.
  • FIG. 2 shows in a section AA 'to FIG. 1 the arrangement of the IR sensors 4 in the sleeve 7.
  • the IR sensors 4 are preferably arranged with the viewing direction oriented radially to the displacement body 3, so that they each have a sector S of the cross-section around the displacement body 3 that is free for the flow in the delivery line 2.
  • the device according to the invention advantageously comprises a plurality of IR sensors 4, which are arranged so distributed over the circumference of the displacement body 3 that their respective fields of view forming a sector S around the displacement body 3 cover the delivery line 2 around the displacement body 3. In this way, the free space for the flow around the displacement body 3 can be monitored for the presence of glow nests 1 without gaps.
  • the IR sensors 4 are advantageously in the azimuthal direction, ie in a cross-sectional plane perpendicular to the flow direction u, and / or in the axial direction, ie offset from one another in the longitudinal direction of the displacer 3.
  • the azimuthal offset and the axial offset of the IR sensors 4 are illustrated in FIG. 2. The fact that the IR sensors 4 are offset from their neighbors ensures complete monitoring of the space around the sleeve 7.
  • the number of IR sensors 4 depends on the respective structural conditions and the size of the detection range of the respective IR sensors 4. As a rule, it will be advantageous if the number of IR sensors 4 is between 3 and 10, preferably between 5 and 8. In the illustrated embodiment, six IR sensors 4 are used.
  • a smoldering nest 1 can only pass the IR sensors 4 at a maximum distance that is considerably smaller than the distance that occurs when the IR sensors 4 are arranged in the pipe wall of the delivery line 2 results in the absence of the use of a displacement body 3.
  • the radial distance between the outside of the displacer 3 or the sleeve 7 and the inner wall of the delivery line 2 in the region of the displacer 3 is chosen to be so small or that the diameter of the displacer 3 is chosen to be so large, that the IR sensors 4 along the inner wall of the conveying line 2, ie at a maximum distance from the IR sensors 4, can detect conveyed glow nests 1.
  • the IR sensors 4 along the inner wall of the conveying line 2, ie at a maximum distance from the IR sensors 4 can detect conveyed glow nests 1.
  • FIG. 3 illustrates in a section the free cross section A in the area of the delivery line 2 in front of or behind the displacement body 3, and in FIG. 4 the free cross section B of the delivery line 2 in the area of the displacement body 3 is shown.
  • the cross section or diameter of the delivery line 2 in the area of the displacement body 3 be enlarged compared to the upstream and / or downstream area of the delivery line 2.
  • a further advantageous embodiment can consist in that the cross section B remaining free in the area of the displacement body 3 for the flow in the delivery line 2 is at least as large as the cross section A of the delivery line 2 located further upstream and / or downstream.
  • the cross section B remaining free in the region of the displacement body 3 for the flow in the delivery line 2 is at least as large or larger than the cross section A of the delivery line 2 located further upstream and / or downstream, it is ensured that the arrangement of the displacement body 3 there is no significant narrowing of the delivery line or an increase in the flow rate in the delivery line 2.
  • FIG. 5 shows a longitudinal section of a device according to the invention for detecting glow nests 1 in a delivery line 2 corresponding to FIG. 1.
  • the displacement body 3 comprises a sleeve 7, in which the IR sensors 4 are arranged.
  • the sleeve 7 and the further elements of the displacement body 3 are held inside with a first holding device 5, preferably in the middle of the delivery line 2.
  • the first holding device 5 is designed as a holding elbow and is arranged on the rear, downstream end 9 of the displacer 3. This arrangement is advantageous compared to an attachment of the first holding device 5 to the front, upstream end 8 of the displacement body 3, because the flow against the sleeve 7 containing the IR sensors 4 can be better designed and is not impaired by a flow shadow of the first holding device 5 ,
  • the displacement body 3 is aerodynamically shaped, that is, it has a fluid mechanically favorable or favorable form.
  • the displacement body 3 is tapered at the front, upstream end 8 against the flow direction u and at the rear, downstream end 9 tapered in the flow direction u.
  • the front sleeve 11 is connected to a second holding device 6, with which the displacement body 3 in the delivery line 2 is held and which is arranged at an axial distance from the first holding device 5 on the displacement body 3.
  • the second holding device 6 arranged at the front end 8 essentially serves to stabilize the direction of the displacement body 3 in the flow. Since no electrical lines are led through the second holding device 6, the second holding device 6 is weaker than the first holding device 5. This has the advantage that the second holding device 6 generates the smallest possible flow shadow, which avoids deposits on the sleeve 7.
  • the cross section of the front sleeve 11 is at least so large that the elongated sleeve 7 is in the flow shadow of the front sleeve 11.
  • the sleeve 7 is well protected against damage from parts flying in the delivery line 2.
  • the front sleeve 11 is made of an impact-resistant material, in particular steel.
  • the front sleeve 11, the sleeve 7 and the end sleeve 12 are smooth on the outside and merge continuously and flush into one another.
  • the outside of the displacer 3 is thus largely smooth overall, in particular the part formed by the sleeve 7. This is both in relation to the flow resistance emanating from the displacement body 3 as well as in terms of avoiding deposits and dirt on the displacement body 3, in particular on the sleeve 7, advantageous.
  • the delivery line 2 has a cutout 15 provided with a closable cover 14 in the area of the displacement body 3.
  • the device is easily accessible, can be quickly installed and removed and, if necessary, can be exchanged for another preassembled unit overall in a brief interruption of operation.
  • a preamplifier housing 10 is mounted on the cover 14.
  • the upper end of the first holding device 5 is screwed to a threaded sleeve 19.
  • the inside of the preamplifier housing 10 is sealed with an O-ring 18 against the threaded bushing, the bottom of the preamplifier housing 10 and the first holding device 5.
  • FIG. 6 shows the front end 8.
  • the front sleeve 11 (shown in section) is connected to the second holding device 6 (screwed, welded or the like).
  • the key attachment 17 serves to secure the second holding device 6 and the front sleeve 11 connected thereto against rotation during assembly.
  • FIG. 7 shows the rear end 9.
  • the first holding device 5, which is designed as a manifold, is firmly connected to the end sleeve 12 attached to it.
  • the holding device 5 is hollow and the electrical connection lines for the IR sensors run in its interior 4.
  • the first connecting device 5 leads the electrical connecting lines from the receptacle 20 directly into a preamplifier housing 10.
  • the first holding device 5 is axially fixed in the cover 14 by a dowel pin 16. As shown in Figure 5, the interior of the preamplifier housing 10 is sealed with an O-ring 18.
  • FIG. 8 illustrates in a section D - D 'to FIG. 5 that the delivery line 2 has a closable cover 14 in the area of the displacement body 3.
  • the cover 14 is screwed to the flange 21 mounted on the delivery line during assembly.
  • the displacement body 3 is advantageously connected to the cover 14 by one or more holding devices.
  • FIG. 10 shows a top view of the delivery line 2 in the area of the displacement body 3, the cover 14 being removed. You can see the cutout 15 in the delivery line 2, in which the displacement body can be inserted.
  • the cover 14 is screwed to the flange 21 placed on the delivery line 2.
  • the use of a quick-closing device can also be expedient.
  • a thin seal can be inserted between cover 14 and flange 21, so that cutout 15 is sealed in delivery line 2.
  • FIG. 11 shows in detail to FIG. 5 a sleeve-shaped receiving bush 20 which is arranged in the sleeve 7 and carries the IR sensors 4.
  • the openings in the receptacle 20 in which the IR sensors 4 are inserted are also shown. It can be seen that the IR sensors 4 are offset from one another both in the azimuthal and in the axial direction of the receiving bushing 20, so that the sector-shaped fields of view covered by them cover the entire space around the displacement body 3.
  • the receiving bushing 20 advantageously consists of metal, for example aluminum or iron.
  • the receptacle 20 is constructed from two parts.
  • the two parts of the receptacle 20 can be constructed asymmetrically for reasons of assembly technology. During assembly, they can be held together by two precisely fitting metal rings, and the complete receptacle 20 with the IR sensors 4 can be supported by means of spacers between the two support points of the displacement body 3.
  • FIG. 12 shows the azimuthal arrangement of the IR sensors or of the sectors S detected by their fields of view in a top view of the receptacle 20.
  • IR sensors 4 with a field of view angle of 60 ° are used, so that a total of 6 IR sensors 4 are required for 360 ° monitoring of the delivery line.
  • the number of IR sensors required increases or decreases accordingly.
  • FIGS. 13 to 16 illustrate embodiments of the electronic circuit for operating the IR sensors 4 and evaluating their signals.
  • 13 shows an electronic circuit housed in the receptacle 20 is.
  • the IR sensors 4 labeled S1 to S6 are shown, each with associated 1 M resistors.
  • the operating voltage for the sensors is present at + V.
  • the outputs lead through the interior of the hollow first holding device 5 to a preamplifier.
  • the capacitors are used to smooth the operating voltage.
  • the IR sensors 4 are operated with a constant bias. The change in voltage due to a change in resistance when IR radiation is incident is amplified and measured.
  • An IR sensor 4 represents a changing ohmic resistance.
  • Each IR sensor 4 is connected in series with an ohmic resistance of 1 M such that a change in resistance of the IR sensor 4 causes a voltage drop between this resistor and the IR sensor 4 causes. This change in voltage is the useful signal.
  • the two capacitors connected in parallel serve to compensate for any fluctuations that may occur in the bias voltage.
  • the signals of the electronic circuit shown in FIG. 13 are amplified in preamplifiers, which are preferably located outside the delivery line 2 but as close as possible to the sensors.
  • the circuit diagram of such a preamplifier is shown in FIG. 14.
  • the entire preamplifier consists of six such individual non-inverting amplifiers. So that the voltage signal coming from the IR sensor can be amplified, the signal must be separated from the bias voltage. This is done with a capacitor at the input of the preamplifier.
  • Low-noise operational amplifiers are used to amplify very small voltages, since the subsequent one Amplifier level with the noise amplified.
  • the operational amplifier OPA 627 used in the preamplifier is such a low-noise operational amplifier with a very low input noise voltage.
  • the preamplifier circuit triples the input signals. To dampen high-frequency interference, the supply voltage of the operational amplifier of the preamplifier circuit is freed of high-frequency interference via a low-pass circuit.
  • the output signals of the preamplifier circuits are further amplified in main amplifier circuits.
  • the main amplifier is composed of six inverting amplifiers, one of which is shown in FIG. 15.
  • the precision operational amplifier LT 1028 was used for the amplifier circuit.
  • the gain can be set using 10 k precision potentiometers.
  • the signal goes through a high-pass circuit and is then freed from negative components by a diode.
  • the signal is then applied to a comparator circuit, which is also shown in FIG. 15.
  • This circuit was realized with a precise and inexpensive standard operational amplifier OP 07 E.
  • the response threshold of the comparator can be varied using a 10 k potentiometer. When this set trigger threshold voltage is exceeded, the comparator emits a high rectangular pulse, the duration of which corresponds to the duration of the threshold being exceeded.
  • the output signals of the six comparator circuits are fed to the six inputs of a logic circuit shown in FIG. 16, which controls seven light-emitting diodes via flip-flops.
  • a red LED is assigned to each IR sensor 4. These six LEDs are, according to the spatial orientation of the sensors in the tube, arranged in a circle and numbered consecutively.
  • a seventh, yellow LED serves for the general display of a detection event in which a glow nest 1 was recognized.
  • the red LEDs light up when there is a comparator square-wave signal from the corresponding IR sensor 4 and only go out when a reset button is pressed.
  • the red LEDs show where a glow nest 1 was detected in the delivery line 2.
  • the electronic circuit described above can preferably be used for a trial operation.
  • the electronic circuit can be modified, for example by automatically setting the trigger threshold using a peak value memory or by completely evaluating the signal using a computer.
  • the exemplary embodiment of a device according to the invention has a number of advantages.
  • the maximum possible distance between an IR sensor 4 and a glow nest 1 flying past is reduced to such an extent that reliable glow nest detection is possible.
  • the device thus does not have the disadvantage of detection systems in which the IR sensors 4 are arranged in the wall of the delivery line 2 and in which the absorption of the IR radiation emitted by the smoldering nests 1 by the material to be conveyed is essential.
  • the central attachment of the displacement body 3 carrying the IR sensors 4 in the middle of the delivery line 2 has the further advantage that the high flow rate in the middle of the pipeline, the sleeve 7 on the displacement body 3 is always kept clean; Dust deposits and the associated blindness of the IR sensors are avoided.
  • the IR sensors 4 and the electronic circuit of a device according to the invention can be designed in such a way that the limitation of conventional systems to the detection of smoldering nests 1 with surface temperatures above 250 ° C. is eliminated.
  • the device described can be designed so that even glow nests 1 with a surface temperature of less than 100 ° C can be reliably recognized. This represents a significant gain in security.
  • Another advantage achieved by the design is that the direction of flow u does not meet sensitive surfaces, for example made of glass, of the displacer 3 or the IR sensors 4 perpendicularly, but is oriented predominantly or preferably exclusively parallel to these sensitive surfaces is. This not only largely avoids contamination and deposits, but also direct impacts from the conveyed material or solid bodies carried in the flow. At least this constructive design significantly reduces the risk of glass breakage due to solids being transported in the flow.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Control Of Conveyors (AREA)
  • Optical Measuring Cells (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Volume Flow (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Earth Drilling (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP03023055A 2002-10-25 2003-10-14 Dispositif pour la reconnaissance de noyaux de feux couvants Expired - Lifetime EP1413998B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10249743 2002-10-25
DE10249743A DE10249743A1 (de) 2002-10-25 2002-10-25 Vorrichtung zum Erkennen von Glimmnestern

Publications (3)

Publication Number Publication Date
EP1413998A2 true EP1413998A2 (fr) 2004-04-28
EP1413998A3 EP1413998A3 (fr) 2004-11-17
EP1413998B1 EP1413998B1 (fr) 2008-04-02

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ID=32049608

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EP03023055A Expired - Lifetime EP1413998B1 (fr) 2002-10-25 2003-10-14 Dispositif pour la reconnaissance de noyaux de feux couvants

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Country Link
EP (1) EP1413998B1 (fr)
AT (1) ATE391326T1 (fr)
DE (2) DE10249743A1 (fr)
ES (1) ES2302889T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2244237A1 (fr) 2009-04-21 2010-10-27 Minimax GmbH & Co. KG Dispositif de reconnaissance et d'alerte de survenues d'incendies avec des matériaux inflammables

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824392A (en) * 1972-04-24 1974-07-16 Pak Const Ab Detector to indicate burning or glowing particles
DE4304890A1 (de) * 1992-04-27 1993-10-28 Jossi Hans Praezisionsmechanik Verfahren und Vorrichtung zum Ermitteln einer Meßgröße aus einem in einer Rohrleitung strömenden Medium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5061026A (en) * 1990-08-23 1991-10-29 Clarke's Sheet Metal, Inc. Light rod assembly for spark detection system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824392A (en) * 1972-04-24 1974-07-16 Pak Const Ab Detector to indicate burning or glowing particles
DE4304890A1 (de) * 1992-04-27 1993-10-28 Jossi Hans Praezisionsmechanik Verfahren und Vorrichtung zum Ermitteln einer Meßgröße aus einem in einer Rohrleitung strömenden Medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2244237A1 (fr) 2009-04-21 2010-10-27 Minimax GmbH & Co. KG Dispositif de reconnaissance et d'alerte de survenues d'incendies avec des matériaux inflammables

Also Published As

Publication number Publication date
DE10249743A1 (de) 2004-05-06
EP1413998A3 (fr) 2004-11-17
DE50309522D1 (de) 2008-05-15
ATE391326T1 (de) 2008-04-15
ES2302889T3 (es) 2008-08-01
EP1413998B1 (fr) 2008-04-02

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