EP0041952B1 - Gefahren-meldeeinheit mit einem zustands-sensorelement - Google Patents

Gefahren-meldeeinheit mit einem zustands-sensorelement Download PDF

Info

Publication number
EP0041952B1
EP0041952B1 EP80901773A EP80901773A EP0041952B1 EP 0041952 B1 EP0041952 B1 EP 0041952B1 EP 80901773 A EP80901773 A EP 80901773A EP 80901773 A EP80901773 A EP 80901773A EP 0041952 B1 EP0041952 B1 EP 0041952B1
Authority
EP
European Patent Office
Prior art keywords
radiation
optical
alarm device
electro
transducer
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.)
Expired
Application number
EP80901773A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0041952A1 (de
Inventor
Jürg Muggli
Gustav Pfister
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Priority to AT80901773T priority Critical patent/ATE14252T1/de
Publication of EP0041952A1 publication Critical patent/EP0041952A1/de
Application granted granted Critical
Publication of EP0041952B1 publication Critical patent/EP0041952B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a hazard reporting unit with a status sensor element which changes its output voltage when a hazardous status to be reported occurs, whereby a reporting signal is generated.
  • Such reporting units can be used to report dangerous conditions, for example to report a fire, to report dangerous gases or vapors, to increase temperature undesirably, or to protect against burglary or theft.
  • the message signal can be used to alarm or to initiate protective or countermeasures when the undesired state occurs.
  • the sensor elements used in the reporting units are matched to the condition to be detected and are designed, for example, as fire, smoke, gas, radiation, temperature or intrusion detectors.
  • the invention can be used with particular advantage where sensor elements with high electrical resistance are required, for example ionization chambers when used as fire detectors.
  • the voltage supply from an evaluation unit to the individual signaling unit arranged at a distance therefrom and the signal return from these signaling units to the signaling center generally takes place by means of electrical lines, possibly also by wireless electrical transmission.
  • electrical lines possibly also by wireless electrical transmission.
  • electrical interference often occurs during line transmission, e.g. B. network pulses or induced in the lines electrical voltages that lead to an incorrect response of the signaling units and to an incorrect signal transmission.
  • telephone connections with a modulated laser beam have been proposed, as described in "The Bell System Technical Journal 58 (1979)".
  • the known detectors have further disadvantages, which are listed below.
  • the supply voltage fluctuates due to the voltage drop in the lines, so that complex stabilization devices are required.
  • the components of the signaling unit are also exposed to environmental influences, e.g. B. temperature-dependent, so that complex compensation measures must be taken.
  • environmental influences e.g. B. temperature-dependent
  • special protective measures are necessary when voltage is supplied via electrical cables.
  • US Pat. No. 3,805,066 shows an optical smoke detector in which the individual smoke chambers arranged in series are connected to one another by light guides.
  • the optical connection between the smoke chambers has nothing to do with the above-mentioned reasons, namely the exchange of an electrical connection by an optical connection, because it only connects purely optical sensors that work according to the light barrier principle, without the sensor element having to be supplied with an electrical voltage, and therefore neither an optical-electrical nor an electrical-optical converter are provided.
  • the object of the invention is to provide a hazard alarm unit that has low power consumption and works sensitively, reliably, without interference, stably, precisely and independently of voltage over longer periods.
  • the hazard detection unit is particularly suitable for use in potentially explosive atmospheres and / or under the influence of electrical interference.
  • a central evaluation unit E which has a radiation source Q and a radiation receiver R.
  • the radiation source Q is fed by a signal circuit S, while the output signal of the radiation receiver R is fed back to the signal circuit S.
  • the signal circuit S emits an alarm signal to an alarm unit A or causes z. B. via EDP the initiation of protective or countermeasures.
  • Corresponding signal circuits are e.g. B. in large numbers from the technology of optical condition detectors, for. B. smoke detectors, known.
  • the radiation from the radiation source Q is referred to by a first radiation-conducting element L ⁇ , also known as fiber optics, hereinafter referred to as light guide for the sake of brevity, to a plurality of signaling units M i , M 2 , M 3 , ... ver arranged away from the evaluation unit E. shares that have sensors for the condition to be detected.
  • the coupling and decoupling of the radiation for the individual signaling units takes place in a manner known in light guide technology, with branching elements V 1 , V 2 , ... or W 1 , W 2 , ... suitable training, likewise the connection to the individual reporting units via suitable known connections.
  • the radiation is taken from the individual signaling units M 1 , M 2 , M3,...
  • the individual signaling units M i , M 2 , M 3 , ... are therefore connected in parallel via a light guide L 1 and L 2 to the evaluation unit E in a group.
  • the entire group can be closed behind the last signaling unit by an end element T, which is used to monitor the functioning of the light guides.
  • the light guides used can either consist of a single fiber or can be made of several, ie as a light guide bundle.
  • Supply line L 1 and return line L 2 can also be combined into a single bundle.
  • the type of light guide can be selected as required and in coordination with the signaling units of various types.
  • any suitable lamp, a light or infrared emitting diode or a LASER can be used as radiation source Q, the spectral distribution being broadband, monochromatic, multimonochromatic.
  • the spectrum of this radiation source Q such that it is adapted to the transmission properties of the light guides when using single-mode light guides and to the properties of the radiation receiver R.
  • the radiation source intermittently or in pulses e.g. B. to operate at a frequency of 30 Hz or to design the branching elements in a known manner so that the individual signaling units receive radiation sequentially at different times in the manner of an optical multiplex.
  • the radiation receiver R is expediently matched to the radiation source Q and can, for. B. as a photoconductor (Si, GaAs, PbSe, InSb), as a pyroelectric element (LiTa0 3 , TGS, PVF 2 ) or as a bolometer.
  • a photoconductor Si, GaAs, PbSe, InSb
  • a pyroelectric element LiTa0 3 , TGS, PVF 2
  • FIG. 2 shows a signaling unit M with a high-resistance sensor element F, which requires a voltage supply of a few volts for operation, but only has a very low power consumption.
  • the sensor element F contains a sensor 8, the electrical resistance of which changes when exposed to a state variable to be detected, which is connected in series with a reference element 9. In such an arrangement, the voltage drop at the sensor 8 and thus the output potential U of the sensor element changes when the state parameter to be monitored changes.
  • one or more solar cells, for. B. silicon diodes which receive radiation from a branch L 3 of the light guide L. If the resistance of the sensor element F is large enough and the power consumption is correspondingly low, the voltage generated by these solar cells or silicon diodes 7 is sufficient to operate the sensor element F.
  • the output potential U of the sensor element F controls a likewise very high-resistance electrical-optical converter T.
  • This can consist of an LCD element with electrically controllable radiation permeability or reflection, e.g. B. a suitable liquid crystal, which is attached to a reflective surface R o . Radiation is fed to this transducer T via a branch L 4 of the light guide Li and removed again from the light guide L 2 . Normally, as long as the liquid crystal is opaque to radiation, no signal is returned via this light guide L 2 .
  • the liquid crystal becomes transparent so that the radiation supplied via the light guide L 4 is reflected by the reflector R o and the evaluation unit via the Light guide L 2 receives radiation.
  • Such LCD elements are known from watch technology.
  • FIG. 3 shows a detection unit designed as an ionization fire detector.
  • the sensor 8 is designed as an air-accessible ionization chamber and the reference element 9 as a less air-accessible or smoke-insensitive ionization chamber. Both ionization chambers contain radioactive sources for ionizing the air in the chambers. In this arrangement, the potential U at the junction of the two ionization chambers changes in accordance with the smoke density in the air-accessible ionization chamber 8.
  • a field-effect transistor FET serving as an impedance converter and threshold switch, the gate of which is connected to the connection point of the two ionization chambers 8 and 9 and its source and drain via contr Stands 1 and 2 are connected to connections 3 and 4 of the sensor element.
  • condition sensors can also be used, which react to other condition parameters to be detected, for example to certain gases or vapors, to changes in humidity, temperature or pressure, etc.
  • FIG. 4 shows, as a high-resistance sensor F, a semiconductor element, for example a MOSFET, a MOS capacitance or a Schottky diode with a gas, temperature, moisture, smoke or pressure-sensitive active layer A1.
  • a pressure and temperature sensitive MOSFET structure is known as POSFET ("Science” 200 [1978], p. 1371), in which the active layer AI consists of polarized polyvinylidene fluoride.
  • CFT charge flow
  • the active layer consists of poly (p-aminophenylacetylene) , the characteristic of which changes as a function of moisture, and which is applied to a silicon dioxide layer SIO.
  • the hydrogen-sensitive MOSFET structure in which the active layer AI consists of palladium metal ("Vacuum” 27 [1976], p. 245).
  • Sensors of the type described thus represent high-resistance controllable semiconductors in which the insulator layer of a gas, temperature, moisture, pressure or smoke-sensitive insulator layer Al, for. B. from a PVF 2 (polyvinyl difluoride) layer corresponds.
  • the bias voltage at the gate electrode EG is set approximately to the threshold value for the conductivity between the source electrode Es and the drain electrode ED. This conductivity changes when exposed to ambient conditions.
  • FIG. 5 shows an electrical-optical converter with electrically controllable radiation deflection, for example of the LiNb0 3 type.
  • a converter T has a chip EO, which has the property that when an electrical voltage U is applied, the light irradiated via an optical fiber L 4 is deflected in different directions depending on the voltage.
  • the light guide L 2 which absorbs the radiation is now arranged at a point which corresponds to an output voltage of the sensor element F and thus an input voltage U of the converter at which an alarm message is to be given.
  • FIG. 6 shows an electro-optical converter in which the beam path in the air space between the two light guides L 4 , L 2 through a piezoelectric element PB, for example through a multilayer polyvinyl difluoride (PVF 2 ) structure which has become known as a »bimorph structure is changed, which is arranged in a gap between the light guides L 4 and L 2 covered with a cladding CL and is provided on both outer sides with electrodes EL.
  • PV 2 multilayer polyvinyl difluoride
  • FIG. 7 shows, as a further example, an electro-optical converter in which the beam path in the air space between the two light guides L 4 , L 2 is changed by an electrostatic semiconductor switch SI.
  • a silicon oxide layer SIO is moved into the beam path by an applied voltage V 1 , V 2 between the electrodes EL.
  • This element SIO-EL also acts as a bimetal, so that a fire detector provided with it is sensitive to both smoke and temperature.
  • the semiconductor switch can also be constructed like the stepper motors used in clock technology.
  • a signaling unit can be created in which both the transmission of the power required to operate the sensor element and the signal transmission back to the evaluation unit take place in a purely optical way.
  • the selection of the sensor elements is by no means limited to the components mentioned, but any, with particular advantage high-resistance sensors for any state variables can be used, for.
  • FIG. 8 shows the structural design of a detection unit designed as an ionization fire detector, which operates according to the functional principle explained with reference to FIGS.
  • the ionization chambers can be constructed, for example, according to Swiss patent 551 057 or US Pat. No. 3,908,957.
  • the fire detector contains an outer ionization chamber 8 and an inner ionization chamber 9, which are arranged on the two sides of an electrically insulating carrier plate 10.
  • the first ionization chamber 8, which serves as a sensor element, has an outer electrode 11 designed as a metal grid, through which air can penetrate into the interior of the chamber.
  • the outer electrode of the other ionization chamber 9 serving as a reference chamber, on the other hand, is equipped with a largely air-impermeable metal hood 13 as the outer electrode.
  • the carrier plate 10 is mounted in a housing 20 which has a base plate 21, an adjoining cylinder part 22 and a cover 23.
  • a housing 20 which has a base plate 21, an adjoining cylinder part 22 and a cover 23.
  • an annular opening 24 is provided between the cylinder part 22 and cover 23 for the air to enter the smoke-sensitive ionization chamber 8.
  • the housing 20 can be connected to a base part 30 which is fastened, for example, to the room ceiling.
  • This connection can be made, for example, with a snap lock, with projections 26 of a plurality of snap springs 25 provided on the housing 20 sliding over an annular web 31 on the base part 30 and locking there.
  • the base part 30 is connected to a central evaluation unit via light guides Li and L 2 . These light guides end in a plug S 1 on the underside of the base part 30.
  • the base plate 21 contains a matching light guide socket S 2 as a counterpart. Light guide connections of this type are commercially available and known. European patent publications 6 662 and 8 709 are mentioned from the large number of publications. For example, a "Connector" C-21 from Hughes Aircraft Co. can be used for this.
  • the radiation arriving via the light guide Li is directed via a branch L 3 to the optical-electrical converter 7, for example a solar cell battery, which is connected to the two outer electrodes 11 and 13 of the ionization chambers 8 and 9 is connected and the series circuit of the two chambers supplies a voltage.
  • the plunger 15 connecting the counterelectrodes 12 and 14 is connected to the electrical-optical converter T, which receives radiation via the other branch L 4 of the light guide L 1 and whose retroreflection is removed from the light guide L 2 and via plug connection S 2 , S 1 and the Base part 30 is returned to the evaluation unit.
  • An ionization fire detector designed in this way has all the advantages of conventional ionization fire detectors with regard to optimal smoke sensitivity and a particularly early response to the slightest trace of smoke, but avoids the disadvantages associated with the need for power supply and signal return via electrical lines.
  • Such an ionization fire detector can be used with particular advantage when electrical interference in the lines is to be expected or in an explosive environment.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP80901773A 1979-12-17 1980-09-22 Gefahren-meldeeinheit mit einem zustands-sensorelement Expired EP0041952B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80901773T ATE14252T1 (de) 1979-12-17 1980-09-22 Gefahren-meldeeinheit mit einem zustandssensorelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1113779 1979-12-17
CH11137/79 1979-12-17

Publications (2)

Publication Number Publication Date
EP0041952A1 EP0041952A1 (de) 1981-12-23
EP0041952B1 true EP0041952B1 (de) 1985-07-10

Family

ID=4370443

Family Applications (2)

Application Number Title Priority Date Filing Date
EP80901773A Expired EP0041952B1 (de) 1979-12-17 1980-09-22 Gefahren-meldeeinheit mit einem zustands-sensorelement
EP80106917A Withdrawn EP0032169A1 (de) 1979-12-17 1980-11-10 Mit elektromagnetischer Strahlung arbeitende Meldeanlage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP80106917A Withdrawn EP0032169A1 (de) 1979-12-17 1980-11-10 Mit elektromagnetischer Strahlung arbeitende Meldeanlage

Country Status (13)

Country Link
US (1) US4379290A (enrdf_load_stackoverflow)
EP (2) EP0041952B1 (enrdf_load_stackoverflow)
JP (3) JPS56501779A (enrdf_load_stackoverflow)
BE (1) BE881812A (enrdf_load_stackoverflow)
CA (1) CA1150359A (enrdf_load_stackoverflow)
DE (2) DE3070861D1 (enrdf_load_stackoverflow)
FR (1) FR2471636B1 (enrdf_load_stackoverflow)
GB (1) GB2066451B (enrdf_load_stackoverflow)
IT (1) IT1136224B (enrdf_load_stackoverflow)
NO (1) NO151801C (enrdf_load_stackoverflow)
SE (1) SE8008723L (enrdf_load_stackoverflow)
WO (1) WO1981000636A1 (enrdf_load_stackoverflow)
ZA (1) ZA807269B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014019172A1 (de) 2014-12-17 2016-06-23 Elmos Semiconductor Aktiengesellschaft Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
DE102014019773A1 (de) 2014-12-17 2016-06-23 Elmos Semiconductor Aktiengesellschaft Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683895U (enrdf_load_stackoverflow) * 1979-12-01 1981-07-06
US4521771A (en) * 1979-12-04 1985-06-04 Omni Devices, Inc. Combined static and dynamic image data display system
FR2528980A1 (fr) * 1982-06-17 1983-12-23 Pgep Detecteur de niveau d'ionisation d'un milieu gazeux controle par arc electrique
WO1984001650A1 (en) * 1982-10-11 1984-04-26 Cerberus Ag Diffused radiation smoke detector
GB2139346A (en) * 1983-03-04 1984-11-07 Univ London Optical sensor
GB2147757B (en) * 1983-10-07 1987-02-11 Gen Electric Plc Apparatus for sensing a physical property
GB8621688D0 (en) * 1986-09-09 1986-10-15 Graviner Ltd Radiation detection arrangements
US5028139A (en) * 1987-07-16 1991-07-02 Miles Inc. Readhead for reflectance measurement of distant samples
GB8906554D0 (en) * 1989-03-22 1989-05-04 Harley Phillip E Optical system for detector device
US4998096A (en) * 1989-06-26 1991-03-05 Anthony Benvenuti Multipurpose alarm device
DE4028188A1 (de) * 1990-09-05 1992-03-12 Esser Sicherheitstechnik Brandmelder mit einem streulicht- und einem ionisationssystem
GB2286667B (en) * 1994-02-15 1997-12-24 Transmould Limited Smoke detector
US6292105B1 (en) * 1998-12-23 2001-09-18 The Johns Hopkins University Thermal ionization detector
AUPQ553800A0 (en) * 2000-02-10 2000-03-02 Cole, Martin Terence Improvements relating to smoke detectors particularily duct monitored smoke detectors
CA2328539A1 (en) 2000-12-13 2002-06-13 Leonard G. D. Allen Solar powered surveillance monitor
US6900726B2 (en) * 2003-01-03 2005-05-31 Antronnix, Inc. System and method for fiber optic communication with safety-related alarm systems
KR20060126476A (ko) * 2003-10-23 2006-12-07 테렌스 콜 마틴 입자 모니터와 관련된 개선 및 그 방법
US8624745B2 (en) * 2011-03-16 2014-01-07 Honeywell International Inc. High sensitivity and high false alarm immunity optical smoke detector
CN103515475B (zh) * 2012-06-29 2015-10-28 江苏瑞新科技股份有限公司 一种硅光电池串归正机构及其归正方法
DE102013213721B4 (de) * 2013-03-07 2015-10-22 Siemens Schweiz Ag Brandmeldeanlage für den Einsatz in einem Nuklearbereich oder EX-Bereich
FR3030750B1 (fr) * 2014-12-22 2017-01-13 Finsecur Detecteur optique d'une valeur d'une grandeur physique de l'atmosphere representative d'un danger
CN108140293B (zh) 2015-08-25 2020-04-14 日本芬翁股份有限公司 光电式烟雾传感器
CN109035679A (zh) * 2018-08-15 2018-12-18 成都理工大学 基于物联网技术的自组网动态安全指示牌系统
CN110500138B (zh) * 2019-09-25 2024-05-24 中国矿业大学(北京) 一种煤矿井下皮带火灾预警系统

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619612A (en) * 1969-11-19 1971-11-09 Caterpillar Tractor Co Monitoring device for rotating systems
US3805066A (en) * 1972-08-14 1974-04-16 T Chijuma Smoke detecting device utilizing optical fibers
US3805006A (en) * 1972-10-13 1974-04-16 Gen Motors Corp Resilient electrical contact assembly
IL45331A (en) * 1973-11-26 1977-12-30 Chloride Batterijen Bv Photoelectric smoke detector
US4075512A (en) * 1975-02-04 1978-02-21 The United States Of America As Represented By The Secretary Of The Army Light pipe technique for grid pulsing
US4071753A (en) * 1975-03-31 1978-01-31 Gte Laboratories Incorporated Transducer for converting acoustic energy directly into optical energy
CH592932A5 (enrdf_load_stackoverflow) * 1976-04-01 1977-11-15 Cerberus Ag
CH592933A5 (enrdf_load_stackoverflow) * 1976-04-05 1977-11-15 Cerberus Ag
US4158144A (en) * 1976-09-17 1979-06-12 Siemens Aktiengesellschaft Circuit arrangement for the transmission of electrical supply power
GB1540907A (en) * 1976-12-07 1979-02-21 Standard Telephones Cables Ltd System for obtaining data from a plurality of condition responsive optical devices
US4143941A (en) * 1977-12-01 1979-03-13 Sperry Rand Corporation Low loss optical data terminal device for multimode fiber guide optical communication systems
US4226533A (en) * 1978-09-11 1980-10-07 General Electric Company Optical particle detector
SE413808B (sv) * 1978-09-22 1980-06-23 Asea Ab Metdon for overforing av metsignaler via en optisk lenk
CH634429A5 (en) * 1978-12-21 1983-01-31 Cerberus Ag Smoke detector
JPS5683895U (enrdf_load_stackoverflow) * 1979-12-01 1981-07-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014019172A1 (de) 2014-12-17 2016-06-23 Elmos Semiconductor Aktiengesellschaft Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
DE102014019773A1 (de) 2014-12-17 2016-06-23 Elmos Semiconductor Aktiengesellschaft Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons

Also Published As

Publication number Publication date
GB2066451A (en) 1981-07-08
IT8012757A0 (it) 1980-12-16
NO812765L (no) 1981-08-14
US4379290A (en) 1983-04-05
NO151801C (no) 1985-06-05
ZA807269B (en) 1982-01-27
CA1150359A (en) 1983-07-19
JPS5694495A (en) 1981-07-30
JPH0241737Y2 (enrdf_load_stackoverflow) 1990-11-07
FR2471636B1 (enrdf_load_stackoverflow) 1983-12-23
JPS63175297U (enrdf_load_stackoverflow) 1988-11-14
DE3037636A1 (de) 1981-06-25
EP0041952A1 (de) 1981-12-23
DE3070861D1 (en) 1985-08-14
IT1136224B (it) 1986-08-27
GB2066451B (en) 1984-11-21
SE8008723L (sv) 1981-06-18
NO151801B (no) 1985-02-25
BE881812A (nl) 1980-06-16
JPS56501779A (enrdf_load_stackoverflow) 1981-12-03
FR2471636A1 (enrdf_load_stackoverflow) 1981-06-19
WO1981000636A1 (en) 1981-03-05
EP0032169A1 (de) 1981-07-22

Similar Documents

Publication Publication Date Title
EP0041952B1 (de) Gefahren-meldeeinheit mit einem zustands-sensorelement
EP0370426B1 (de) Infraroteindringdetektor
DE69935377T2 (de) Infrarot/sichtbar multispektraler Strahlungsdetektor
DE69634441T2 (de) Optische zwischenstelle mit sicherheitsabschaltung
DE69224015T2 (de) Optischer Detektor für bevorrechtigten Verkehr
DE2500179A1 (de) Alarmgeber
DE3530646A1 (de) Flaechensicherung
DE3044944A1 (de) Feueralarmsystem
DE2922008A1 (de) Eindringalarmsystem
DE2057221A1 (de) Vorrichtung zur Feststellung eines Feuers oder von Flammen
EP0338218A1 (de) Verfahren zur Brandfrüherkennung
EP0240783A1 (de) Ansprechzähler für einen Überspannungsableiter
EP2907117B1 (de) Integrierter schaltkreis zum betrieb in einem bereich mit ionisierender strahlung und mit einer ausgabemöglichkeit für eine strahlendosisabhängige schädigungsinformation sowie gefahrenmelder und korrespondierendes verfahren
DE3504945A1 (de) Anordnung zum messen der elektrischen spannungsparameter eines hochspannungsleiters
DE1766889A1 (de) Detektoranordnung
DE69312982T2 (de) Pyroelektrische Vorrichtung
EP0067313B1 (de) Rauchdetektor mit einer impulsweise betriebenen Strahlungsquelle
DE4319377C2 (de) Einrichtung zum dezentralen Messen und/oder Überwachen und/oder Steuern an einem Hochspannungsschaltgerät
DE2434686A1 (de) Signal-waehleinrichtung fuer basisbandsignale
EP0190547B1 (de) Ansprechzähl- und Überwachungs-Einrichtung für funkenstreckenlose Überspannungsableiter
DE2519267A1 (de) Brandmelder
DE3031674A1 (de) Anordnung zur brandraucherkennung
DE19619459C2 (de) Schaltung zur Erfassung elektromagnetischer Strahlung
DE29519666U1 (de) Detektor für elektromagnetische Strahlung
DE3232924A1 (de) Strahlungsdetektoranordnung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB LI NL SE

17P Request for examination filed

Effective date: 19810228

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT CH DE FR GB LI NL SE

REF Corresponds to:

Ref document number: 14252

Country of ref document: AT

Date of ref document: 19850715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3070861

Country of ref document: DE

Date of ref document: 19850814

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860811

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870930

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890922

Ref country code: AT

Effective date: 19890922

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19890923

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19890930

Ref country code: CH

Effective date: 19890930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19900401

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19900531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900601

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 80901773.4

Effective date: 19900521