EP2251846B1 - Fire alarm - Google Patents

Fire alarm Download PDF

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Publication number
EP2251846B1
EP2251846B1 EP09006433.8A EP09006433A EP2251846B1 EP 2251846 B1 EP2251846 B1 EP 2251846B1 EP 09006433 A EP09006433 A EP 09006433A EP 2251846 B1 EP2251846 B1 EP 2251846B1
Authority
EP
European Patent Office
Prior art keywords
radiation
flame detector
optical window
detector according
ring
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.)
Not-in-force
Application number
EP09006433.8A
Other languages
German (de)
French (fr)
Other versions
EP2251846A1 (en
Inventor
Hauke Dipl.-Ing. Dittmer
Axel Dipl.Ing. Grothoff
Dirk Dipl.-Ing. Siemer
Arne Dipl.-Ing. Stamer
Peter Dipl.-Ing. Zülzer
Kurt Dipl.-Phys. Dr. Lenkeit
Bernd Dipl.-Ing. Ziems
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.)
Minimax GmbH and Co KG
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Minimax GmbH and Co KG
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 Minimax GmbH and Co KG filed Critical Minimax GmbH and Co KG
Priority to EP09006433.8A priority Critical patent/EP2251846B1/en
Priority to RU2010119163/08A priority patent/RU2538940C2/en
Priority to US12/800,298 priority patent/US8400314B2/en
Priority to CN201010228100.1A priority patent/CN101894442B/en
Publication of EP2251846A1 publication Critical patent/EP2251846A1/en
Application granted granted Critical
Publication of EP2251846B1 publication Critical patent/EP2251846B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • 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
    • 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
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/043—Monitoring of the detection circuits of fire detection circuits

Definitions

  • the invention relates to a flame detector according to the preamble of the first claim.
  • the invention can be used anywhere where flame detectors are used to detect a fire and IR or UV radiation occurs, which is measured after passing through an optical window, whereby contamination of the optical window and the function is monitored and a protection against mechanical Damage to the window allows trouble-free detection of fire phenomena.
  • Flame detectors for detecting optical fire phenomena have long been known. They usually consist of a housing in which sensor elements and a corresponding signal processing electronics are arranged, wherein an optical window closes the housing in the direction of the fire phenomenon to be detected. Through the optical window, radiation falls into the housing and is detected by means of a sensor.
  • the problem is that the optical window can pollute, whereby less radiation enters the housing and errors in the detection can occur. Furthermore, the result of the detection can be falsified by influences such as sun rays, shadows and the like.
  • the optical window is exposed to mechanical influences that can lead to destruction or at least damage. In industrial areas or dust explosion hazardous areas there are high demands on the tightness and the mechanical strength of the housing and the optical entrance window.
  • a detector for detecting electromagnetic radiation with a cover plate which is transparent to the radiation and has a housing which is impermeable to the radiation which responds to electromagnetic radiation and generates an electrical output signal as a function of the radiation.
  • the contamination of the cover is measured by the electromagnetic radiation of a radiation source on the cover, so the optical window, passed and measured by the sensor element in the interior of the detector as a measure of pollution.
  • US 5,257,013 describes a flame detector on the underside of which a protection against mechanical stresses in the form of brackets or deflectors is arranged.
  • the detector does not have a large-area optical window and the mechanical protection does not serve to monitor the contamination of the entrance window or the function monitoring of the sensors.
  • a disadvantage of the existing flame detectors is that they must be set or rebuilt according to the expected flame event.
  • US 4,547,673 describes a flame or smoke detector with a radiation receiver element and a maximum of two radiation sources. This has specially arranged reflectors.
  • the reflective elements are optimized to affect a minimum of the surface of the entrance window.
  • the disadvantage is that due to the geometric conditions (large optical window and areal small reflectors) and lack of explanations on the mechanical strength of the reflector material, these reflectors do not provide sufficient mechanical protection.
  • the detection of fires by means of flame detectors can then lead to false alarms if sunlight, artificial light, welding, heaters or other sources of interference distort the result.
  • US 3952 196 A describes a UV flame detector with UV receiver element and UV transmitter, which has a bridge with reflective elements above the optical window.
  • the bridge and the reflective elements are intended only for the contamination monitoring of the optical window. Due to the geometric conditions (large optical window and areal small web) this reflector does not provide sufficient mechanical protection. There is also no functional monitoring of the sensors and the signal processing electronics provided. Furthermore, the reflector is not easily replaceable. Since the holder of the reflector simultaneously holds the optical window, the replacement of the reflector is expensive. Without this part of the detector is not functional, since the optical window has no support in the present construction.
  • the solution according to the invention provides a flame detector, consisting of the housing, in which sensors, one or more radiation sources and an optical window are arranged, in which a reflector guard basket or ring is arranged above the optical window, which is suitable for the optical window to protect against mechanical influences, transmits IR and UV radiation to a sufficient extent and on its inside is suitable to reflect UV and IR radiation.
  • the most favorable embodiment variant of the reflector protective basket is an exchangeable metal grid, which has a mirrored surface and which is elastic.
  • the reflector protective cage or ring made of elastic durable plastic, which is chromed or mirrored on its surface.
  • the elastic reflector guard basket may have interconnected webs, which open at their ends in a receiving flange to the optical window and engage in a recess or a groove in the receiving flange and thus are stably fixed.
  • wide and narrow tabs can be made, which are introduced into different width recesses in the receiving flange and anchored in this.
  • the reflector protection basket can cover the entire surface of the window as a concave hood, which by a Easily squeezable by hand, usable or screwed in as a bayonet lock, removable and replaceable.
  • the reflector guard basket or ring can also cover only a certain area at the edge of the optical window. Under certain circumstances, however, it is also sufficient to guide only one or more protective strips over the optical window in a protective manner.
  • the removal of the reflector protection basket has no influence on the tightness of the housing and the functionality of the flame detector. It can be removed or replaced at any time. Furthermore, most of the surface of the optical window is protected from mechanical destruction by the reflector guard basket or ring.
  • optical window it is advantageous to carry out the optical window as CaF 2 , sapphire or other UV / IR permeable materials such as mica or the like.
  • the housing consists of an upper and a lower part, wherein the supply lines for the energy and for the signals, for example, to an alarm station and in the upper part of the sensors and all signal processing components are arranged in the lower part.
  • the reflector guard In the upper housing part of the optical window, the reflector guard, sensors, the radiation source and possibly a microcontroller are arranged and an electrical plug connection to the lower part.
  • IR and / or UV radiation sensors can also be only or additionally imaging sensors.
  • a UV radiation sensor may be arranged, which detects a flame signal and the signal of the radiation source. It is also conceivable, however, one or more IR sensors or a combination of IR and UV sensors.
  • an IR radiation sensor can be arranged on the level immediately below the optical window and a UV radiation sensor one level lower.
  • an optical signal is sent through the optical window by the radiation source or the radiation sources in the upper part, which is reflected on the reflector guard and reflected to the IR and / or UV radiation sensor, so that after double penetration of the beam through
  • the optical window can be a measure of what pollution the optical window and the function of the sensors and the signal processing electronics can be tested.
  • one or more IR and / or several UV radiation sources may be arranged.
  • the housing upper part which is exchangeable, can be placed on the housing lower part.
  • sealing rubbers should be arranged between the housing parts.
  • Other types of seals may be advantageous.
  • This seal or an additional may be formed as an electrically conductive EMC gasket. Due to the interchangeability of the housing upper part, it is possible to respond quickly to current requirements, if required, according to the modular principle.
  • Another possible communication module could have integrated the industry-standard 4.4 .... 20mA interface for alarm transmission.
  • Digital communication modules make it possible with the fire alarm panel via Looptechnik, d. H. To communicate data exchange with the fire alarm panel via a protocol and thus to locate the alarm, retrieve the status of the flame detector at the fire panel or to parameterize the detector from the fire panel.
  • the service interface can be designed as a connector or socket.
  • the invention has the advantage that the optical window is protected even with the appropriate size from mechanical influences, with a pollution monitoring of Window, a function monitoring of the sensors and the signal processing electronics and easy replacement of components in the flame detector is given.
  • FIG. 1 shows a schematic representation of the flame detector according to the invention, consisting of the upper housing part 1.1 and the lower housing part 1.2, between which are seals, housing upper part and lower housing part 1.1, 1.2, are connected to each other by an electrical connector 14, in the signal lines and power supplies are arranged.
  • the housing upper part 1.1 there is an electronic module 18 on a plane consisting of the UV radiation sensor 8.1 with the UV filter 10.1 of the UV radiation source 9.1, the addressing switch 17 and the communication module 16 with its connector 15.
  • the optical window 7 is made of sapphire and is held by the receiving flange 4, in which the reflector guard basket 2.1 is arranged.
  • a flame phenomenon which emits UV radiation can be detected by the radiation sensor 8. 1 in an intended wave range.
  • a light signal corresponding to the wavelength emitted by the radiation source 9.1, which is reflected by the reflector guard basket 2.1 and by the UV radiation sensor 8.1 is detected.
  • the reflector protection cage 2.1 protects the optical window 7 against mechanical damage and reflects the radiation emitted by the UV radiation source 9.1 to the UV radiation sensor 8.1.
  • the reflected radiation is used for contamination analysis of the optical window 7 and for monitoring the function of the sensors and the subsequent signal processing.
  • About the replaceable communication module 16 of the flame detector communicates with the fire panel.
  • the addressing switch 17 serves, in the case of using a digital communication module, which makes the detector to a subscriber in a signaling ring, with the set address an alarm or fault signal to assign this detector clearly.
  • a connector is arranged as a service interface 20, which also in the Figures 2 and 3 you can see.
  • FIG. 2 shows an embodiment of the flame detector according to the invention, consisting of housing upper part 1.1 and lower housing part 1.2, in which two electronic modules 18, 19 are arranged, the lower electronic module containing the addressing switch 17 and the communication module 16 with connector 15 and the upper assembly 19 each have three IR radiation sensors 8.2 with IR filter 10.2 and IR radiation sources 9.2, which emit an IR beam on the reflector protection ring 2.2, which reflects this over the IR filter 10.2 to the IR radiation sensor 8.2. Between the modules 18, 19, a connector 13 is arranged.
  • FIG. 3 shows a similar arrangement of the electronic components in a schematic representation, which is located above the optical window 7 a reflector guard basket 2.1 and in the lower electronic module 18 additionally a UV radiation source 9.1 and a UV radiation sensor are 8.1 with UV filter 10.1. With this version of the flame detector both UV and IR radiation can be detected.
  • FIG. 4 shows the hood-shaped designed reflector guard basket 2.1, through whose free spaces the UV and / or IR radiation can enter unhindered, with different width tabs 3.2, 3.1 are present, with which the elastic reflective reflector guard 2.1 in the receiving flange 4 can be screwed.
  • the reflector guard 2.1 is made of reflective metal sheet, the tabs 3.2, 3.1 by hand in the bayonet mount or recess 5.1 and 5.2 of the flange Fig. 6 be arrested.
  • reflector protection ring 2.2 which has a very large transmissive surface for the UV and IR radiation.
  • Both reflector protection basket 2.1 and the reflector protection ring 2.2 can be used with their tabs 3.1, 3.2 in the recesses 5.1, 5.2 of the receiving flange 4 and can be rotated in this.
  • the stop notch 6 serves to limit this twisting movement.
  • the receiving flange 4 holds both the optical window 7 and the reflection guard or the reflection protection ring 2.1, 2.2.
  • FIG. 7 shows the schematic representation of the radiation sensors 8.1, 8.2 for trouble-free detection of flames, with three IR radiation sensors 8.2 are arranged side by side with IR filter 10.2, the signal of a signal processing 11 is supplied.
  • This signal processing 11 represents an A / D converter, an amplifier or a signal adaptation, which leads to a microcontroller 12 with memory which processes and stores the signal.
  • an IR radiation source 9.2 is arranged, which emits an IR radiation for checking the degree of soiling of the optical window 7.
  • a UV radiation sensor can be arranged 8.1 with UV filter 10.1, the signal from the sensor is forwarded via a signal adjustment to the microcontroller with memory 12 and from a UV radiation source 9.1 UV signals to the optical window 7 for checking the Pollution degree and the function of the sensors can be sent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

Die Erfindung betrifft einen Flammenmelder entsprechend dem Oberbegriff des ersten Patentanspruches.The invention relates to a flame detector according to the preamble of the first claim.

Die Erfindung ist überall dort einsetzbar, wo Flammenmelder zum Detektieren eines Brandes eingesetzt sind und IR- oder UV-Strahlung auftritt, welche nach Durchtritt durch ein optisches Fenster gemessen wird , wobei eine Verschmutzung des optischen Fensters und die Funktion überwacht wird sowie ein Schutz vor mechanischer Beschädigung des Fensters eine störungsfreie Erfassung von Feuererscheinungen ermöglicht.The invention can be used anywhere where flame detectors are used to detect a fire and IR or UV radiation occurs, which is measured after passing through an optical window, whereby contamination of the optical window and the function is monitored and a protection against mechanical Damage to the window allows trouble-free detection of fire phenomena.

Flammenmelder zum Erfassen von optischen Feuererscheinungen sind seit langem bekannt. Sie bestehen in der Regel aus einem Gehäuse, in dem Sensorelemente und eine entsprechende Signalverarbeitungselektronik angeordnet sind, wobei ein optisches Fenster das Gehäuse in Richtung auf die zu detektierende Feuererscheinung verschließt. Durch das optische Fenster fällt eine Strahlung in das Gehäuse und wird mittels Sensor detektiert. Problematisch ist, daß das optische Fenster verschmutzen kann, wodurch weniger Strahlung in das Gehäuse gelangt und Fehler bei der Detektion auftreten können. Weiterhin kann das Ergebnis der Detektion durch Einflüsse wie Sonnenstrahlen, Schatten und ähnliches verfälscht werden. Weiterhin ist das optische Fenster mechanischen Einflüssen ausgesetzt, die zur Zerstörung oder zumindest zur Beschädigung führen können. In Industriebereichen oder Staubexplosionsgefährdeten Bereichen bestehen hohe Anforderungen an die Dichtigkeit und die mechanisch Festigkeit an das Gehäuse und das optische Eintrittsfenster. Auch ein möglicher Ausfall oder Störung der Sensoren und der Signalverarbeitungselektronik können die Zuverlässigkeit und Verfügbarkeit der Branderkennung stark beeinträchtigen. Nach der Installation und Inbetriebnahme eines Flammenmelders kommt es vor, dass dieser nach einer gewissen Zeit technisch bedingt oder durch Änderung des Brandrisikos durch einen baugleichen Flammenmelder, durch einen Flammenmelder mit anderen Spezifikationsdaten wie z.B. der Empfindlichkeitsklasse oder sogar durch einen Brandmelder getauscht werden muss, der eine andere Brandkenngröße z.B Wärme oder Brandgase detektiert. Dies ist bei bekannten Flammenmeldern mit einem hohen Montageaufwand verbunden. Bei bekannten Flammenmeldern muss der gesamte Melder demontiert und die gesamte Verkabelungsanschlüsse zur elektrischen Versorgung und der Verbindung zu einer Brandnielderzentrale oder einer anderen Empfangseinrichtung gelöst werden. Im Anschluss daran muss der neue Brandmelder neu montiert und verkabelt werden. Dies erfordert zusätzliche Kosten und in der langen Zeitdauer der Umrüstung ist kein Brandschutz durch automatische Detektion gewährleistet.Flame detectors for detecting optical fire phenomena have long been known. They usually consist of a housing in which sensor elements and a corresponding signal processing electronics are arranged, wherein an optical window closes the housing in the direction of the fire phenomenon to be detected. Through the optical window, radiation falls into the housing and is detected by means of a sensor. The problem is that the optical window can pollute, whereby less radiation enters the housing and errors in the detection can occur. Furthermore, the result of the detection can be falsified by influences such as sun rays, shadows and the like. Furthermore, the optical window is exposed to mechanical influences that can lead to destruction or at least damage. In industrial areas or dust explosion hazardous areas there are high demands on the tightness and the mechanical strength of the housing and the optical entrance window. Even a possible failure or malfunction of the sensors and the signal processing electronics can greatly affect the reliability and availability of fire detection. After the installation and commissioning of a flame detector it happens that after a certain time due to technical reasons or due to a change of the fire risk by an identical flame detector, by a flame detector with other specifications such as the sensitivity class or even by a fire alarm must be exchanged, the one other fire parameters such as heat or combustion gases detected. This is associated with known flame detectors with a high installation cost. In known flame detectors, the entire detector must be dismantled and the entire wiring connections for electrical supply and the connection to a fire control panel or other receiving device to be solved. Following this, the new fire detector must be re-assembled and wired. This requires additional costs and in the long period of retrofitting no fire protection is guaranteed by automatic detection.

Aus DE 42 40 395 A1 ist ein Detektor zur Erfassung elektromagnetischer Strahlung mit einem unter einer für die Strahlung durchlässigen Abdeckscheibe mit einem für die Strahlung undurchlässigen Gehäuse angeordneten Sensorelement bekannt, das auf elektromagnetische Strahlung anspricht und in Abhängigkeit von der Strahlung ein elektrisches Ausgangssignal erzeugt. Die Verschmutzung der Abdeckscheibe wird gemessen, indem die elektromagnetische Strahlung einer Strahlungsquelle auf die Abdeckscheibe, also das optische Fenster, geleitet und vom Sensorelement im Inneren des Detektors als Maß der Verschmutzung gemessen wird.Out DE 42 40 395 A1 For example, a detector for detecting electromagnetic radiation with a cover plate which is transparent to the radiation and has a housing which is impermeable to the radiation is known which responds to electromagnetic radiation and generates an electrical output signal as a function of the radiation. The contamination of the cover is measured by the electromagnetic radiation of a radiation source on the cover, so the optical window, passed and measured by the sensor element in the interior of the detector as a measure of pollution.

Eine ähnliche Vorrichtung ist in US 5,914,489 beschrieben, bei der ein Lichtstrahl von einer Strahlungsquelle von oben auf das optische Fenster geleitet wird und durch einen Sensor unterhalb des optischen Fensters erfaßt wird, in welchem Maß die Strahlung das optische Fenster durchdringt, so daß Rückschlüsse auf den Verschmutzungsgrad des optischen Fensters möglich sind.A similar device is in US 5,914,489 described, in which a light beam from a radiation source is directed from above the optical window and is detected by a sensor below the optical window, to which extent the radiation penetrates the optical window, so that conclusions about the degree of contamination of the optical window are possible.

Bei beiden Lösungen ist das optische Fenster nicht vor mechanischen Einflüssen geschützt.In both solutions, the optical window is not protected against mechanical influences.

US 5,257,013 beschreibt einen Flammendetektor, an dessen Unterseite ein Schutz vor mechanischen Beanspruchungen in Form von Bügeln oder Abweisern angeordnet ist. Der Detektor weist allerdings kein großflächiges optisches Fenster auf und der mechanische Schutz dient nicht der Verschmutzungsüberwachung des Eintrittsfensters oder der Funktionsüberwachung der Sensoren. US 5,257,013 describes a flame detector on the underside of which a protection against mechanical stresses in the form of brackets or deflectors is arranged. However, the detector does not have a large-area optical window and the mechanical protection does not serve to monitor the contamination of the entrance window or the function monitoring of the sensors.

Nachteilig an den vorhandenen Flammenmeldern ist weiterhin, daß diese jeweils entsprechend dem zu erwartenden Flammenereignis eingestellt oder umgebaut werden müssen.A disadvantage of the existing flame detectors is that they must be set or rebuilt according to the expected flame event.

DE 203 06 590.5 beschreibt eine Gehäuseschale für einen Brandmelder, der einen raschen Umbau ermöglicht. Eine Ausführung für einen Flammenmelder ist weder beschrieben noch bezeichnet. DE 203 06 590.5 describes a housing shell for a fire detector, which allows a quick conversion. A design for a flame detector is neither described nor designated.

US 4,547,673 beschreibt einen Flammen- oder Rauchmelder mit einem Strahlungsempfängerelement und maximal zwei Strahlungsquellen. Dieser weist speziell angeordnete Reflektoren auf. Die reflektierenden Elemente sind so optimiert, daß sie ein Minimum der Oberfläche des Eintrittsfensters beeinflussen. Nachteilig ist, daß durch die geometrischen Verhältnisse (großes optisches Fenster und flächenmäßig kleine Reflektoren) und durch fehlende Ausführungen zur mechanischen Belastbarkeit des Reflektormaterials diese Reflektoren keinen ausreichend mechanischen Schutz bieten. US 4,547,673 describes a flame or smoke detector with a radiation receiver element and a maximum of two radiation sources. This has specially arranged reflectors. The reflective elements are optimized to affect a minimum of the surface of the entrance window. The disadvantage is that due to the geometric conditions (large optical window and areal small reflectors) and lack of explanations on the mechanical strength of the reflector material, these reflectors do not provide sufficient mechanical protection.

Das Erkennen von Bränden mittels Flammenmelder kann dann zu Fehlalarmen führen, wenn Sonnenlicht, Kunstlicht, Schweißen, Heizgeräte oder andere Störquellen das Ergebnis verfälschen.The detection of fires by means of flame detectors can then lead to false alarms if sunlight, artificial light, welding, heaters or other sources of interference distort the result.

Weiterhin sehen Vorschriften vor, daß für den Fall, daß Flammenmelder in explosionsgefährdeten Räumen eingesetzt werden, gewährleistet sein muß, daß aus Gründen des Explosionsschutzes das Gehäuse bei hohen mechanischen Anforderungen z.B. Schlagfestigkeit oder Erschütterungen nicht beschädigt wird. Das optische Eintrittsfenster muss vor diesen Einflüssen ausreichend geschützt sein. In Staubexplosionsgefährdeten Bereichen bestehen hohe Anforderungen an die chemische sowie die aus Umwelteinflüssen resultierende Beständigkeit aller Dichtungsmaterialien.Furthermore, regulations provide that in the event that flame detectors are used in hazardous areas, it must be ensured that for reasons of explosion protection, the housing with high mechanical requirements, for. Impact resistance or shocks is not damaged. The optical entrance window must be sufficiently protected against these influences. In dust explosive atmospheres there are high demands on the chemical as well as on the environmental influences resulting resistance of all sealing materials.

US 3952 196 A beschreibt einen UV-Flammenmelder mit UV-Empfängerelement und UV-Sender, welcher über dem optischen Fenster einen Steg mit reflektierenden Elementen aufweist. Der Steg und die reflektierenden Elemente sind nur für die Verschmutzungsüberwachung des optischen Fensters vorgesehen. Durch die geometrischen Verhältnisse (großes optisches Fenster und flächenmäßig kleiner Steg) gewährleistet dieser Reflektor keinen ausreichend mechanischen Schutz. Es ist auch keine Funktionsüberwachung der Sensoren und der Signalverarbeitungselektronik vorgesehen. Weiterhin ist der Reflektor nicht leicht austauschbar. Da die Halterung des Reflektors gleichzeitig das optische Fenster hält, ist der Austausch des Reflektors aufwendig. Ohne dieses Teil ist der Melder aber nicht funktionsfähig, da das optische Fenster bei der vorliegenden Bauweise anders keinen Halt hat. US 3952 196 A describes a UV flame detector with UV receiver element and UV transmitter, which has a bridge with reflective elements above the optical window. The bridge and the reflective elements are intended only for the contamination monitoring of the optical window. Due to the geometric conditions (large optical window and areal small web) this reflector does not provide sufficient mechanical protection. There is also no functional monitoring of the sensors and the signal processing electronics provided. Furthermore, the reflector is not easily replaceable. Since the holder of the reflector simultaneously holds the optical window, the replacement of the reflector is expensive. Without this part of the detector is not functional, since the optical window has no support in the present construction.

Es ist daher Aufgabe der Erfindung, einen Flammenmelder zu entwickeln, dessen optisches Fenster auch bei entsprechender Fenstergröße vor mechanischen Einflüssen geschützt ist, wobei eine Verschmutzungsüberwachung des optischen Fensters gegeben sein muß und eine leichte Austauschbarkeit von Komponenten vorhanden sein soll.It is therefore an object of the invention to develop a flame detector whose optical window is protected even with the appropriate window size from mechanical influences, with a pollution monitoring of the optical window must be given and easy interchangeability of components should be present.

Diese Aufgabe wird durch einen Flammenmelder nach den Merkmalen des ersten Patentanspruches gelöst.This object is achieved by a flame detector according to the features of the first claim.

Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung wieder.Subclaims give advantageous embodiments of the invention again.

Die erfindungsgemäße Lösung sieht einen Flammenmelder, bestehend aus dem Gehäuse, vor, in dem Sensoren, eine oder mehrere Strahlungsquellen und ein optisches Fenster angeordnet sind, bei dem über dem optischen Fenster ein Reflektorschutzkorb oder -ring angeordnet ist, der geeignet ist, das optische Fenster vor mechanischen Einflüssen zu schützen, IR- und UV-Strahlungen im ausreichenden Maße durchläßt und an seiner Innenseite geeignet ist, UV- und IR-Strahlungen zu reflektieren.The solution according to the invention provides a flame detector, consisting of the housing, in which sensors, one or more radiation sources and an optical window are arranged, in which a reflector guard basket or ring is arranged above the optical window, which is suitable for the optical window to protect against mechanical influences, transmits IR and UV radiation to a sufficient extent and on its inside is suitable to reflect UV and IR radiation.

Als günstigste Ausführungsvariante des Reflektorschutzkorbs ist ein austauschbares Metallgitter anzusehen, welches eine verspiegelte Oberfläche aufweist und welches elastisch ist.The most favorable embodiment variant of the reflector protective basket is an exchangeable metal grid, which has a mirrored surface and which is elastic.

Vorstellbar ist es auch, den Reflektorschutzkorb oder -ring aus elastischem haltbarem Kunststoff herzustellen, der auf seiner Oberfläche verchromt oder verspiegelt ist. Der elastische Reflektorschutzkorb kann miteinander verbundene Stege aufweisen, die mit ihren Enden in einen Aufnahmeflansch um das optische Fenster münden und in eine Vertiefung oder eine Rinne im Aufnahmeflansch einrasten und damit stabil befestigt sind. Dazu können breite und schmale Laschen ausgeführt sein, die in unterschiedlich breite Aussparungen im Aufnahmeflansch eingebracht und in diesem verankert werden. Der Reflektorschutzkorb kann die gesamte Oberfläche des Fensters als konkave Haube überdecken, die durch einen Bediener mit der Hand einfach zusammendrückbar, einsetzbar oder als Bajonettverschluss eindrehbar, entfernbar und austauschbar ist. Der Reflektorschutzkorb oder-ring kann aber auch nur einen bestimmten Bereich am Rand des optischen Fensters überdecken. Es genügt unter Umständen aber auch, nur einen oder mehrere Schutzstreifen in schützender Weise über das optische Fenster zu führen.It is also conceivable to produce the reflector protective cage or ring made of elastic durable plastic, which is chromed or mirrored on its surface. The elastic reflector guard basket may have interconnected webs, which open at their ends in a receiving flange to the optical window and engage in a recess or a groove in the receiving flange and thus are stably fixed. For this purpose, wide and narrow tabs can be made, which are introduced into different width recesses in the receiving flange and anchored in this. The reflector protection basket can cover the entire surface of the window as a concave hood, which by a Easily squeezable by hand, usable or screwed in as a bayonet lock, removable and replaceable. The reflector guard basket or ring can also cover only a certain area at the edge of the optical window. Under certain circumstances, however, it is also sufficient to guide only one or more protective strips over the optical window in a protective manner.

Die Entfernung des Reflektorschutzkorbes hat keinerlei Einfluß auf die Dichtigkeit des Gehäuses und die Funktionsfähigkeit des Flammenmelders. Er kann jederzeit entfernt bzw. ausgetauscht werden. Weiterhin ist durch den Reflektorschutzkorb oder -ring der größte Teil der Oberfläche des optischen Fensters vor mechanischer Zerstörung geschützt.The removal of the reflector protection basket has no influence on the tightness of the housing and the functionality of the flame detector. It can be removed or replaced at any time. Furthermore, most of the surface of the optical window is protected from mechanical destruction by the reflector guard basket or ring.

Vorteilhaft ist es, das optische Fenster als CaF2, Saphir oder anderen UV/IR durchlässigen Materialien wie Glimmer o. ä. auszuführen.It is advantageous to carry out the optical window as CaF 2 , sapphire or other UV / IR permeable materials such as mica or the like.

Weiterhin ist es vorteilhaft, wenn das Gehäuse aus einem Ober- und einem Unterteil besteht, wobei im Unterteil die Zuleitungen für die Energie und für die Signale, beispielsweise zu einer Alarmstation und im Oberteil die Sensorik und alle Signalverarbeitungskomponenten angeordnet sind. Das hat den Vorteil, daß das Oberteil, welches austauschbar ist, mit geringem Aufwand sowohl für Service und Reparatur gewechselt werden kann als auch apparativ an ein anderes Brandrisiko anpaßbar ist. Die mechanische und elektrische Installation bleibt bestehen.Furthermore, it is advantageous if the housing consists of an upper and a lower part, wherein the supply lines for the energy and for the signals, for example, to an alarm station and in the upper part of the sensors and all signal processing components are arranged in the lower part. This has the advantage that the upper part, which is replaceable, can be changed with little effort both for service and repair as well as apparatus adapted to a different fire risk. The mechanical and electrical installation remains.

Im Gehäuseoberteil sind das optische Fenster, der Reflektorschutzkorb, Sensoren, die Strahlungsquelle und ggf. ein Microcontroller angeordnet sowie eine elektrische Steckverbindung zum Unterteil.In the upper housing part of the optical window, the reflector guard, sensors, the radiation source and possibly a microcontroller are arranged and an electrical plug connection to the lower part.

Es ist vorteilhaft, im Oberteil IR- und/oder UV-Strahlungssensoren anzuordnen. Diese können aber auch nur oder zusätzlich bildgebende Sensoren sein. So kann beispielsweise im Oberteil ein UV-Strahlungssensor angeordnet sein, der ein Flammensignal und das Signal der Strahlungsquelle erfaßt. Denkbar ist aber auch ein oder mehrere IR-Sensoren oder eine Kombination von IR- und UV-Sensoren.It is advantageous to arrange in the upper part IR and / or UV radiation sensors. However, these can also be only or additionally imaging sensors. For example, in the upper part of a UV radiation sensor may be arranged, which detects a flame signal and the signal of the radiation source. It is also conceivable, however, one or more IR sensors or a combination of IR and UV sensors.

Vorteilhaft ist es weiterhin, die Strahlungssensoren in elektrische Baugruppen modular auf unterschiedlichen Ebenen anzuordnen. So kann ein IR-Strahlungssensor auf der Ebene unmittelbar unter dem optischen Fenster angeordnet sein und ein UV-Strahlungssensor eine Ebene tiefer.It is also advantageous to arrange the radiation sensors in electrical assemblies modular at different levels. Thus, an IR radiation sensor can be arranged on the level immediately below the optical window and a UV radiation sensor one level lower.

Um das optische Fenster zu überwachen, wird durch die Strahlungsquelle oder die Strahlungsquellen im Oberteil ein optisches Signal durch das optische Fenster gesandt, welches am Reflektorschutzkorb reflektiert und zum IR- oder/und UV-Strahlungssensor reflektiert wird, so daß nach doppeltem Durchdringen des Strahles durch das optische Fenster ein Maß dafür gewonnen werden kann, welche Verschmutzung das optische Fenster aufweist, und die Funktion der Sensoren und der Signalverarbeitungselektronik geprüft werden kann.To monitor the optical window, an optical signal is sent through the optical window by the radiation source or the radiation sources in the upper part, which is reflected on the reflector guard and reflected to the IR and / or UV radiation sensor, so that after double penetration of the beam through The optical window can be a measure of what pollution the optical window and the function of the sensors and the signal processing electronics can be tested.

Als Strahlungsquelle können ein oder mehrere IR- und / oder aber mehrere UV-Strahlungsquellen angeordnet sein.As a radiation source, one or more IR and / or several UV radiation sources may be arranged.

Grundsätzlich kann das Gehäuse-Oberteil, welches austauschbar ist, auf das Gehäuse-Unterteil gesetzt werden. Dazu sind Dichtungsgrummis zwischen den Gehäuseteilen anzuordnen. Auch andere Dichtungsarten können vorteilhaft sein. Diese Dichtung oder eine zusätzliche kann als elektrisch leitende EMV-Dichtung ausgebildet sein. Durch die Austauschbarkeit des Gehäuse-Oberteils kann bei Bedarf nach dem Bausteinprinzip schnell auf aktuelle Anforderungen reagiert werden.In principle, the housing upper part, which is exchangeable, can be placed on the housing lower part. For this purpose, sealing rubbers should be arranged between the housing parts. Other types of seals may be advantageous. This seal or an additional may be formed as an electrically conductive EMC gasket. Due to the interchangeability of the housing upper part, it is possible to respond quickly to current requirements, if required, according to the modular principle.

Weiterhin ist es vorteilhaft, im Gehäuse-Oberteil einen Steckanschluß mit einem auswechselbaren Kommunikationsmodul anzuordnen.Furthermore, it is advantageous to arrange a plug-in connection with a replaceable communication module in the housing upper part.

Dieses könnte ein Relaismodul sein, welches den Stand-alone-Betrieb des Melders ohne Brandmeldezentrale erlaubt. Ein weiteres mögliches Kommunikationsmodul könnte die im Industriebereich verbreitete 4.4 ....20mA-Schnittstelle zur Alarmübertragung integriert haben. Digitale Kommunikationsmodule erlauben es, mit der Brandmeldezentrale über Loop Technik, d. h. Datenaustausch mit der Brandmelderzentrale über ein Protokoll zu kommunizieren und so den Alarm zu lokalisieren, den Status des Flammenmelders an der Brandmeldezentrale abzurufen oder den Melder von der Brandmeldezentrale aus zu parametrisieren.This could be a relay module, which allows the stand-alone operation of the detector without fire panel. Another possible communication module could have integrated the industry-standard 4.4 .... 20mA interface for alarm transmission. Digital communication modules make it possible with the fire alarm panel via Loop Technik, d. H. To communicate data exchange with the fire alarm panel via a protocol and thus to locate the alarm, retrieve the status of the flame detector at the fire panel or to parameterize the detector from the fire panel.

Darüber hinaus ist es vorteilhaft, im Gehäuse-Oberteil einen Adressierungsschalter anzuordnen. Dieser ermöglicht, in Abhängigkeit vom verwendeten Kommunikationsmodultyp die Melderadresse zur Alarmlokalisierung einzustellen.In addition, it is advantageous to arrange an addressing switch in the housing upper part. This makes it possible to set the detector address for alarm localization depending on the communication module type used.

Weiterhin ist von Vorteil, eine Serviceschnittstelle für die Kontaktierung eines Servicegerätes zur Konfiguration, Parametrisierung und für Softwareupdates, sowie zum Übertragen von Historydaten an einen Rechner oder an eine Datenbank vorzusehen. Die Serviceschnittstelle kann als Anschlußstecker oder Buchse ausgeführt sein.Furthermore, it is advantageous to provide a service interface for contacting a service device for configuration, parameterization and software updates, as well as for transferring history data to a computer or to a database. The service interface can be designed as a connector or socket.

Die Erfindung hat den Vorteil, daß das optische Fenster auch bei entsprechender Größe vor mechanischen Einflüssen geschützt ist, wobei eine Verschmutzungsüberwachung des Fensters, eine Funktionsüberwachung der Sensorik und der Signalverarbeitungselektronik sowie eine leichte Austauschbarkeit der Komponenten im Flammenmelder gegeben ist.The invention has the advantage that the optical window is protected even with the appropriate size from mechanical influences, with a pollution monitoring of Window, a function monitoring of the sensors and the signal processing electronics and easy replacement of components in the flame detector is given.

Im Folgenden wird die Erfindung an einem Ausführungsbeispiel und sieben Figuren näher erläutert. Die Figuren zeigen:

Figur 1:
Schematische Darstellung des erfindungsgemäßen Flammenmelders mit oberem und unterem Gehäuseteil sowie einem Reflektorschutzkorb,
Figur 2:
Schematische Darstellung des erfindungsgemäßen Flammenmelders mit zwei Ebenen für die elektronischen Baugruppen und einem Reflektorschutzring
Figur 3:
Schematische Darstellung des erfindungsgemäßen Flammenmelders mit Reflektorschutzkorb und zwei elektronischen Baugruppen auf unterschiedlichen Ebenen
Figur 4:
Reflektorschutzkorb
Figur 5:
Reflektorschutzring
Figur 6:
Aufnahmeflansch für den Reflektorschutzkorb oder Reflektorschutzring
Figur 7:
Schematische Darstellung von IR-Sensoren zum störungsfreien Detektieren von Flammen.
In the following the invention will be explained in more detail with reference to an exemplary embodiment and seven figures. The figures show:
FIG. 1:
Schematic representation of the flame detector according to the invention with upper and lower housing part and a reflector protection basket,
FIG. 2:
Schematic representation of the flame detector according to the invention with two levels for the electronic modules and a reflector protection ring
FIG. 3:
Schematic representation of the flame detector according to the invention with reflector protection basket and two electronic modules on different levels
FIG. 4:
Reflector protection basket
FIG. 5:
Reflector protection ring
FIG. 6:
Mounting flange for the reflector protection basket or reflector protection ring
FIG. 7:
Schematic representation of IR sensors for trouble-free detection of flames.

Figur 1 zeigt in schematischer Darstellung den erfindungsgemäßen Flammenmelder, bestehend aus dem Gehäuse-Oberteil 1.1 und dem Gehäuse-Unterteil 1.2, zwischen denen sich Dichtungen befinden, wobei Gehäuse-Oberteil und Gehäuse-Unterteil 1.1, 1.2, durch eine elektrische Steckverbindung 14 miteinander verbunden sind, in der die Signalleitungen und Spannungsversorgungen angeordnet sind. Im Gehäuse-Oberteil 1.1 befindet sich eine elektronische Baugruppe 18 auf einer Ebene, die aus dem UV-Strahlungssensor 8.1 mit dem UV-Filter 10.1 der UV-Strahlungsquelle 9.1, dem Adressierungsschalter 17 und dem Kommunikationsmodul 16 mit seiner Steckverbindung 15 besteht. Das optische Fenster 7 besteht aus Saphir und wird durch den Aufnahmeflansch 4 gehalten, in dem auch der Reflektorschutzkorb 2.1 angeordnet ist. Eine Flammenerscheinung, die UV-Strahlung aussendet, ist in einem vorgesehenen Wellenbereich vom Strahlungssensor 8.1 detektierbar. Um den Verschmutzungsgrad des optischen Fensters 7 zu überprüfen, wird von der Strahlungsquelle 9.1 ein Lichtsignal entsprechender Wellenlänge ausgesendet, welches vom Reflektorschutzkorb 2.1 reflektiert wird und durch den UV-Strahlungssensor 8.1 erfaßt wird. Der Reflektorschutzkorb 2.1 schützt das optische Fenster 7 vor mechanischer Beschädigung und reflektiert die von der UV-Strahlungsquelle 9.1 ausgesandte Strahlung zum UV-Strahlungssensor 8.1. Die reflektierte Strahlung wird zur Verschmutzungsanalyse des optischen Fensters 7 und für die Funktionsüberwachung der Sensoren und der nachfolgenden Signalverarbeitung genutzt. Über das auswechselbare Kommunikationsmodul 16 kommuniziert der Flammenmelder mit der Brandmeldezentrale. Der Adressierungsschalter 17 dient dazu, für den Fall der Verwendung eines digitalen Kommunikationsmoduls, welches den Melder zu einem Teilnehmer in einem Melderring macht, mit der eingestellten Adresse ein Alarm- oder Störungssignal diesem Melder eindeutig zu zuordnen. FIG. 1 shows a schematic representation of the flame detector according to the invention, consisting of the upper housing part 1.1 and the lower housing part 1.2, between which are seals, housing upper part and lower housing part 1.1, 1.2, are connected to each other by an electrical connector 14, in the signal lines and power supplies are arranged. In the housing upper part 1.1 there is an electronic module 18 on a plane consisting of the UV radiation sensor 8.1 with the UV filter 10.1 of the UV radiation source 9.1, the addressing switch 17 and the communication module 16 with its connector 15. The optical window 7 is made of sapphire and is held by the receiving flange 4, in which the reflector guard basket 2.1 is arranged. A flame phenomenon which emits UV radiation can be detected by the radiation sensor 8. 1 in an intended wave range. In order to check the degree of soiling of the optical window 7, a light signal corresponding to the wavelength emitted by the radiation source 9.1, which is reflected by the reflector guard basket 2.1 and by the UV radiation sensor 8.1 is detected. The reflector protection cage 2.1 protects the optical window 7 against mechanical damage and reflects the radiation emitted by the UV radiation source 9.1 to the UV radiation sensor 8.1. The reflected radiation is used for contamination analysis of the optical window 7 and for monitoring the function of the sensors and the subsequent signal processing. About the replaceable communication module 16 of the flame detector communicates with the fire panel. The addressing switch 17 serves, in the case of using a digital communication module, which makes the detector to a subscriber in a signaling ring, with the set address an alarm or fault signal to assign this detector clearly.

Weiterhin ist als Serviceschnittstelle 20 ein Anschlußstecker angeordnet, der auch in den Figuren 2 und 3 zu sehen ist.Furthermore, a connector is arranged as a service interface 20, which also in the Figures 2 and 3 you can see.

Die Figur 2 zeigt eine Ausführungsvariante des erfindungsgemäßen Flammenmelders, bestehend aus Gehäuse-Oberteil 1.1 und Gehäuse-Unterteil 1.2, in dem zwei elektronische Baugruppen 18, 19 angeordnet sind, wobei die untere elektronische Baugruppe den Adressierungsschalter 17 und das Kommunikationsmodul 16 mit Steckverbindung 15 enthält und die obere Baugruppe 19 jeweils drei IR-Strahlungssensoren 8.2 mit IR-Filter 10.2 und IR-Strahlungsquellen 9.2, die einen IR-Strahl auf den Reflektorschutzring 2.2 aussenden, der diesen über den IR-Filter 10.2 zum IR-Strahlungssensor 8.2 reflektiert. Zwischen den Baugruppen 18, 19 ist ein Steckverbindung 13 angeordnet.The FIG. 2 shows an embodiment of the flame detector according to the invention, consisting of housing upper part 1.1 and lower housing part 1.2, in which two electronic modules 18, 19 are arranged, the lower electronic module containing the addressing switch 17 and the communication module 16 with connector 15 and the upper assembly 19 each have three IR radiation sensors 8.2 with IR filter 10.2 and IR radiation sources 9.2, which emit an IR beam on the reflector protection ring 2.2, which reflects this over the IR filter 10.2 to the IR radiation sensor 8.2. Between the modules 18, 19, a connector 13 is arranged.

Die Figur 3 zeigt eine ähnliche Anordnung der elektronischen Bauteile in schematischer Darstellung, wobei sich über dem optischen Fenster 7 ein Reflektorschutzkorb 2.1 befindet und in der unteren elektronischen Baugruppe 18 zusätzlich eine UV-Strahlungsquelle 9.1 und ein UV-Strahlungssensor 8.1 mit UV-Filter 10.1 angeordnet sind. Mit dieser Ausführung des Flammenmelders können sowohl UV- als auch IR-Strahlungen detektiert werden.The FIG. 3 shows a similar arrangement of the electronic components in a schematic representation, which is located above the optical window 7 a reflector guard basket 2.1 and in the lower electronic module 18 additionally a UV radiation source 9.1 and a UV radiation sensor are 8.1 with UV filter 10.1. With this version of the flame detector both UV and IR radiation can be detected.

Die Figur 4 zeigt den haubenförmig ausgeführten Reflektorschutzkorb 2.1, durch dessen Freiräume die UV- und / oder IR-Strahlung ungehindert eintreten kann, wobei unterschiedlich breite Laschen 3.2, 3.1 vorhanden sind, mit denen der elastische reflektierende Reflektorschutzkorb 2.1 in den Aufnahmeflansch 4 eindrehbar ist. Der Reflektorschutzkorb 2.1 besteht aus reflektierendem Metallblech, dessen Laschen 3.2, 3.1 von Hand in die Bajonettaufnahme oder Aussparung 5.1 und 5.2 des Flansches Fig. 6 arretiert werden.The FIG. 4 shows the hood-shaped designed reflector guard basket 2.1, through whose free spaces the UV and / or IR radiation can enter unhindered, with different width tabs 3.2, 3.1 are present, with which the elastic reflective reflector guard 2.1 in the receiving flange 4 can be screwed. The reflector guard 2.1 is made of reflective metal sheet, the tabs 3.2, 3.1 by hand in the bayonet mount or recess 5.1 and 5.2 of the flange Fig. 6 be arrested.

Gleiches trifft für den in Figur 5 dargestellten Reflektorschutzring 2.2 zu, der eine sehr große durchlässige Fläche für die UV- und IR-Strahlung aufweist. Sowohl Reflektorschutzkorb 2.1 als auch der Reflektorschutzring 2.2 sind mit ihren Laschen 3.1, 3.2 in die Aussparungen 5.1, 5.2 des Aufnahmeflansches 4 einsetzbar und können in diesem verdreht werden. Die Anschlagkerbe 6 dient der Begrenzung dieser Verdrehbewegung. Der Aufnahmeflansch 4 hält sowohl das optische Fenster 7 als auch den Reflektionsschutzkorb oder den Reflektionsschutzring 2.1, 2.2.The same applies to the in FIG. 5 shown reflector protection ring 2.2, which has a very large transmissive surface for the UV and IR radiation. Both reflector protection basket 2.1 and the reflector protection ring 2.2 can be used with their tabs 3.1, 3.2 in the recesses 5.1, 5.2 of the receiving flange 4 and can be rotated in this. The stop notch 6 serves to limit this twisting movement. The receiving flange 4 holds both the optical window 7 and the reflection guard or the reflection protection ring 2.1, 2.2.

Die Figur 7 zeigt die schematische Darstellung der Strahlungssensoren 8.1, 8.2 zum störungsfreien Detektieren von Flammen, wobei drei IR-Strahlungssensoren 8.2 mit IR-Filter 10.2 nebeneinander angeordnet sind, deren Signal einer Signalverarbeitung 11 zugeführt wird. Diese Signalverarbeitung 11 stellt einen A/D-Wandler, einen Verstärker oder eine Signalanpassung dar, die zu einem Microcontroller 12 mit Speicher führt, der das Signal verarbeitet und speichert. Weiterhin ist eine IR-Strahlungsquelle 9.2 angeordnet, die eine IR-Strahlung zum Prüfen des Verschmutzungsgrades des optischen Fensters 7 aussendet. In gleicher Weise kann auch ein UV-Strahlungssensor 8.1 mit UV-Filter 10.1 angeordnet sein, das Signal des Sensors wird über eine Signalanpassung zum Microcontroller mit Speicher 12 weitergeleitet und von einer UV-Strahlungsquelle 9.1 UV-Signale auf das optische Fenster 7 zur Überprüfung des Verschmutzungsgrades und der Funktion der Sensoren gesendet werden können.The FIG. 7 shows the schematic representation of the radiation sensors 8.1, 8.2 for trouble-free detection of flames, with three IR radiation sensors 8.2 are arranged side by side with IR filter 10.2, the signal of a signal processing 11 is supplied. This signal processing 11 represents an A / D converter, an amplifier or a signal adaptation, which leads to a microcontroller 12 with memory which processes and stores the signal. Furthermore, an IR radiation source 9.2 is arranged, which emits an IR radiation for checking the degree of soiling of the optical window 7. In the same way, a UV radiation sensor can be arranged 8.1 with UV filter 10.1, the signal from the sensor is forwarded via a signal adjustment to the microcontroller with memory 12 and from a UV radiation source 9.1 UV signals to the optical window 7 for checking the Pollution degree and the function of the sensors can be sent.

Claims (10)

  1. Flame detector comprising a housing in which at least one sensor (8.1, 8.2), at least one radiation source (9.1, 9.2) and an optical window (7) are arranged,
    wherein there is arranged above the optical window (7) a reflector protection cage or ring (2.1, 2.2) which is suitable for protecting the optical window (7) from mechanical effects, and which allows through UV and IR radiation (16) to a sufficient degree and which at the inner side thereof reflects UV and IR radiation (16) out of the interior of the housing,
    wherein the reflector protection cage (2.1) or ring (2.2) is constructed in a resilient manner and protrudes with the ends thereof in a receiving flange (4) of an upper housing portion (1.1) of the housing,
    characterised in that the receiving flange (4) has a bayonet receiving member or recess (5.1, 5.2) with a stop notch (6), wherein the reflector protection cage (2.1) or ring (2.2) can be screwed in the receiving flange (4) as a bayonet closure, removed and replaced, wherein a rotation movement of the reflector protection cage (2.1) or ring (2.2) is limited by the stop notch (6),
    wherein the reflector protection cage (2.1) or ring (2.2) has as rotation prevention means flaps (3.1, 3.2) of different widths which can be inserted into the recess (5.1, 5.2) of the receiving flange (4) and which can be locked therein.
  2. Flame detector according to claim 1,
    characterised in that the housing comprises an upper portion (1.1) and a lower portion (1.2), wherein there are arranged in the upper portion (1.1) the optical window (7), the reflector protection cage or ring (2.1, 2.2), the radiation sensor (8.1, 8.2) and the radiation source (9.1, 9.2) and in the lower portion (1.2) a cable inlet and a connection for the supply lines and an electrical plug type connection (14) with respect to the upper portion (1.1).
  3. Flame detector according to claim 2,
    characterised in that the radiation sensors in the upper portion (1.1) constitute UV radiation sensors (8.1) and/or IR radiation sensors (8.2).
  4. Flame detector according to any one of claims 1 to 3, characterised in that the radiation sensors (8.1, 8.2) are arranged on different planes for electronic subassemblies (18, 19).
  5. Flame detector according to any one of claims 1 to 4, characterised in that the radiation source constitutes a UV radiation source and/or at least one or more IR radiation sources (9.1, 9.2).
  6. Flame detector according to any one of claims 1 to 5, characterised in that in the upper housing portion (1.1) a plug type device (15) having a replaceable communication module (16) is arranged.
  7. Flame detector according to any one of claims 1 to 6, characterised in that the optical window (7) comprises CaF2, sapphire or another UV/IR-permeable material.
  8. Flame detector according to any one of claims 1 to 7, characterised in that an addressing switch (17) is arranged in the upper housing portion (1.1).
  9. Flame detector according to any one of claims 1 to 8, characterised in that the protection cage or ring (2.1, 2.2) comprises sheet metal or plastics material.
  10. Flame detector according to any one of claims 1 to 9, characterised in that a service interface (20) is provided for contacting a service device for configuration, parameterisation and software updates and for transmitting history data to a computer or a database.
EP09006433.8A 2009-05-13 2009-05-13 Fire alarm Not-in-force EP2251846B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP09006433.8A EP2251846B1 (en) 2009-05-13 2009-05-13 Fire alarm
RU2010119163/08A RU2538940C2 (en) 2009-05-13 2010-05-12 Fire alarm device
US12/800,298 US8400314B2 (en) 2009-05-13 2010-05-12 Fire alarm
CN201010228100.1A CN101894442B (en) 2009-05-13 2010-05-13 Fire alarm

Applications Claiming Priority (1)

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EP09006433.8A EP2251846B1 (en) 2009-05-13 2009-05-13 Fire alarm

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EP2251846B1 true EP2251846B1 (en) 2017-04-05

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US20100289650A1 (en) 2010-11-18
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US8400314B2 (en) 2013-03-19
CN101894442B (en) 2014-07-23
CN101894442A (en) 2010-11-24

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