EP0971328A1 - Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique - Google Patents

Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique Download PDF

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Publication number
EP0971328A1
EP0971328A1 EP98112822A EP98112822A EP0971328A1 EP 0971328 A1 EP0971328 A1 EP 0971328A1 EP 98112822 A EP98112822 A EP 98112822A EP 98112822 A EP98112822 A EP 98112822A EP 0971328 A1 EP0971328 A1 EP 0971328A1
Authority
EP
European Patent Office
Prior art keywords
pulses
light source
measuring
adapter
detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98112822A
Other languages
German (de)
English (en)
Inventor
Max Grimm
Hansjürg Wälti
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.)
Siemens Building Technologies AG
Original Assignee
Siemens Building Technologies 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 Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP98112822A priority Critical patent/EP0971328A1/fr
Priority to AU33946/99A priority patent/AU761401B2/en
Priority to HU9902007A priority patent/HU222939B1/hu
Priority to NO19993153A priority patent/NO321726B1/no
Priority to KR1019990024565A priority patent/KR100575903B1/ko
Priority to DE59904421T priority patent/DE59904421D1/de
Priority to EP19990112527 priority patent/EP0971329B1/fr
Priority to AT99112527T priority patent/ATE233930T1/de
Priority to PL334271A priority patent/PL191875B1/pl
Priority to CZ0245399A priority patent/CZ297192B6/cs
Priority to CN99110442A priority patent/CN1255695A/zh
Publication of EP0971328A1 publication Critical patent/EP0971328A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits

Definitions

  • the present invention relates to a device for checking the function of Scattered light smoke detectors, which emit a measuring chamber with a light pulse Have measuring light source and a measuring light receiver, with one on one side open and can be placed on the detector to be tested or slid over it Adapter, which can be operated synchronously with the light pulses of the measuring light source Test light source for applying test light pulses to the measuring light receiver contains.
  • the measuring chamber of scattered-light smoke detectors is as tight as possible against Light shielded from the outside to make the detector largely immune to extraneous light close.
  • this shielding cannot be absolute because the detectors are against the outside atmosphere must be open so that smoke can enter the measuring chamber can.
  • the influence of the interference of those entering the measuring chamber despite the shielding the detector's evaluation circuit is designed in such a way that the measuring light receiver only reacts to light that is within a defined range Time window after the triggering of the respective light pulse of the measuring light source Will be received.
  • the type mentioned at the outset is operated by a test light transmitter Detector tester arranged additional light receiver, which receives a light pulse the test light source triggers the test light source. Because of the shielding mentioned the measuring chamber against extraneous light, the additional light receiver receives the light pulses not in every relative position of the detector tester to the detector, but only in certain ones Positions can be received with this detector tester provided to ensure that the detector tester is always in the test position is in the same orientation with respect to the detector.
  • the measuring light source and the additional light receiver take in this orientation of the detector tester as well as the test light source and the measurement light receiver Relative positions in which it is guaranteed that the light pulses of the measuring light source on the additional light receiver and the flashes of the test light source on the Measuring light receiver arrive. Because the positioning means the presence of appropriate This detector tester is a prerequisite for guiding means on the smoke detectors can only be used for detectors of a certain type and can in principle be used for detectors cannot be used without such guide means.
  • a detector tester is now to be specified in any Alignment position in relation to the detector to be tested works properly and which is therefore universally applicable and easily adapted to different types of detectors can be.
  • the object is achieved according to the invention in that the adapter is on responsive to the electromagnetic field generated by the current pulses of the measuring light source and the detector controlling the test light source.
  • the measuring light source is no longer used emitted light pulses detected as such, but by the light pulses triggering current pulses generated electromagnetic field. Because this field is the detector surrounds on all sides and relatively homogeneously, the detector tester can light pulses in any Detect alignment with the detector.
  • a second preferred embodiment of the device according to the invention is thereby characterized in that the said detector is formed by an induction coil is.
  • a third preferred embodiment of the device according to the invention is thereby characterized in that the means mentioned for reflection of the test light pulses a reflective coating arranged on the inside of the adapter is formed.
  • a fourth preferred embodiment of the device according to the invention is thereby characterized in that the adapter is a rotationally symmetrical, box-like or can-like Has shape, and that the induction coil on the inside of the adapter is arranged.
  • the induction coil is near the edge of the open one Side of the adapter or on the bottom opposite the open side.
  • test light source near the edge of the open Arranged side of the adapter and the reflective coating by one of those Edge adjacent strip-shaped area is formed.
  • Another preferred embodiment is characterized in that the induction coil containing bottom part of the adapter is covered by a film.
  • the detector tester according to the invention can in principle be used for testing for any type of stray light detectors are used, so that usually for the detector test used relatively expensive test gas can be dispensed with. That doesn't just result a cost saving but also enables a much faster inspection of whole Detector lines because every detector is fully functional immediately after the test and does not have a measuring chamber filled with the test gas as in the test with test gas and blocked by further alarms the further test.
  • Another preferred embodiment of the device according to the invention is characterized through an electronic circuit to synchronize the release of the test light pulses with the light pulses of the measurement light source, which circuit one Stage for suppressing interference pulses from the signal supplied by the induction coil which has an amplifier, a voltage divider and an electronic contains adjustable resistance, whereby by the adjustable resistance automatically such a shift of the operating point of the amplifier takes place that the interference pulses and the measuring pulses caused by the pulses of the measuring light source differ Sides of the zero line.
  • the detector tester according to the invention is used to check the function of smoke detectors on site, usually with detectors mounted on the ceiling of a room, and is closed trained for this purpose so that it is placed on the detector to be tested from below or can be pushed over this.
  • the detector tester is especially for such detectors suitable, whose housing approximately the shape of a spherical cap or a truncated cone having.
  • Such detectors are, for example, in the international model protection registrations DM / 028 534 and DM / 034 103. This hint is not to be understood as a restriction to the detector types mentioned; Of course is the detector tester according to the invention with possible minor adjustments in practice can be used with all modern stray light smoke detectors.
  • the detector tester essentially consists of a rotationally symmetrical, open on one side, sleeve-shaped adapter 1, from one on the inside of the adapter 1 arranged induction coil 2, at a short distance in front of the edge of the adapter 1 on its open side arranged light source 3 and from electronics 4 arranged in the region of the bottom of the adapter.
  • the induction coil 2 can, as shown in the figure, on the bottom of the adapter 1 or also arranged on its upper edge, for example at the level of the light source 3 his.
  • a scattered light smoke detector M the detector tester is placed on the detector to be tested or, if necessary, pushed over it.
  • the smoke detector M reference is made to EP-A-0 636 266, EP-A-0 821 330 and to the scattered light detectors of the AlgoRex series (AlgoRex - registered trademark of Cerberus AG).
  • the smoke detector M has a measuring chamber 5 shielded from light from the outside a measuring light source 6 and a measuring light receiver 7, whose optical axes are angled with respect to one another and in a central region of the measuring chamber 5 cross.
  • the measuring light source 6 sends short, intense light pulses into the central area the measuring chamber 5, with no light rays due to the selected arrangement get directly from the measuring light source 6 to the measuring light receiver 7 can. Therefore, the latter "sees" the central area of the measuring chamber 5, but not the measuring light source 6.
  • the light from the measuring light source 6 is the measuring chamber 5 scattered smoke and a part of this scattered light is striking the measuring light receiver 7.
  • the evaluation electronics of the detector M are designed such that the measurement light receiver 7 only reacts to scattered light received by it if it is within a certain range Time interval after a light pulse is emitted by the measuring light source 6 arrives at him. The emission of a light pulse by the measuring light source 6 opens So a time window in the evaluation electronics, so that only within this time window generated reception signals of the measuring light receiver 7 are processed.
  • Smoke detector M illuminates the light pulses of the measuring light source 6 intermittently the light source 3 of the detector tester referred to below as the test light source overlaid. These test light pulses arrive in the measuring chamber 5 of the smoke detector M. and in this on the measuring light receiver 7; after receiving one or more Test light pulses are then triggered in detector M Alarm, which is on the alarm indicator of the Detector or in the assigned signal center. This alarm trigger serves as a criterion that the detector is functional.
  • the smoke detector M as large as possible of the test light pulses into the measuring chamber 5 is steered and reaches the measuring light receiver 7, can in the level of Test light source 3 with a strip-shaped area of the inner wall of the detector tester be provided with a reflective coating 8.
  • the induction coil 2 detects that generated by each light pulse of the measuring light source 6 electromagnetic field and controls the test light source 3 so that it is within of the specified time window emits test light pulses.
  • the latter by one metallic cylinder 9, open at the top, surrounded by the upper end face an electromagnetically permeable film 10 can be covered.
  • the film can also be arranged above the cylinder 9.
  • the adapter 1 is installed in a hood-shaped housing 11 which is placed on a sleeve 12. In the latter, a pipe socket 13 is inserted, on which an extension pipe can be pushed.
  • the detector can be checked up to a room height of around 7 m with several of these extension tubes that can be connected to one another by means of pipe clamps.
  • the detector tester is powered either by batteries or by a power cable, with the battery compartment or the power supply unit being located on the lowest extension tube.
  • This box-like device part which also contains a switch for switching the detector tester on and off, is designated in FIG. 1 by the reference symbol BF.
  • the housing 11 can also be connected to the pipe socket 13 via a fork-shaped adapter (not shown), as is the case with the detector testers for the AlgoRex detectors mentioned.
  • FIG 2 shows a block diagram of the adapter containing the induction coil 2 1 connected circuit 4, which is used to synchronize the test light source 3 with the Measuring light source 6 is used.
  • the circuit 4 contains one to the induction coil 2 connected first preamplifier stage 14, one connected to this High / low pass filter 15, a second preamplifier stage connected to the filter 15 16, one connected to the latter and 17 with this bidirectional output stage interacting stage 18 for interference suppression and automatic gain control.
  • An active time filter 19 is connected and connected to the output stage 17 this is a difference evaluation 20.
  • the difference evaluation 20 is a stage 21 for Generation of the electrical pulse downstream for triggering the test light pulse and this a voltage converter 22 connected upstream of the test light source 3.
  • the latter is preferably arranged in the device part BF (Fig. 1).
  • the test light source 3 is by a flash lamp or flash tube, for example one Xenon tube, formed, and the voltage converter 22 is used to provide for the Ignition of the flash lamp required voltage.
  • the voltage converter 22 is one for connection to lightning interference suppression 23 to the output stage 17 is provided.
  • the measuring light source 6 formed, for example, by an infrared diode (IRED) (FIG. 1) sends a light pulse at regular intervals of 1 to 3 seconds, for example , whereby in the induction coil 2 a voltage pulse referred to below as the measuring pulse MP of about 100 ⁇ s duration is induced.
  • This measuring pulse is very small and is a few millivolts.
  • the induction coil 2 is not only caused by the pulses of the measuring light source Voltage pulses induced, but also by the different communication currents on the detector lines. Distinguish from these interference pulses denoted by SP the measuring pulses MP essentially by their significantly lower frequency and by their duration.
  • the voltage pulses induced in the induction coil 2 are are amplified in the first preamplifier stage 14 and then in the high / low pass filter 15 filtered out the coarsest interference pulses.
  • the signal arrives in the final stage 17 and in stage 18 for suppression of interference pulses and automatic gain control.
  • a voltage divider contains an electronically adjustable resistor and a capacitor, are shifted (off-set) in the operating point of the amplifier by the adjustable resistance the measuring pulses MP and the interference pulses SP on different sides shifted the zero line, as shown the measuring pulses MP in the negative and Interference pulses SP in the positive range.
  • the voltage divider automatically regulates the gain.
  • Interference pulses are largely cleaned and formed by a characteristic double pulse Measuring pulse MP available, which has a steep rising edge, which in consequently used to trigger the flash (test light pulse) of test light source 3 becomes.
  • the threshold value may trigger that the flash is triggered by an interference pulse that is still present not be too small; on the other hand, it must not be too big for it to be too weaker light pulses of the measurement light source correspond to smaller measurement pulses can be triggered.
  • the one named and designated SW Threshold value in the differential evaluation stage 20 placed in the middle of the rising edge.
  • a pulse for triggering the test light source (flash lamp) 3 is generated in stage 21.
  • This pulse has the rectangular shape shown and it preferably lasts somewhat longer than the measuring pulse MP, for example about 170 ⁇ s.
  • the lightning interference suppression which suppresses the disturbing influence of the lightning the test light source 3 is used to control the gain because this is for a short time after the flash trigger does not work as desired, it is that the in the Level 18 included amplifier is locked for the duration of the flash.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP98112822A 1998-07-10 1998-07-10 Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique Withdrawn EP0971328A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP98112822A EP0971328A1 (fr) 1998-07-10 1998-07-10 Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique
AU33946/99A AU761401B2 (en) 1998-07-10 1999-06-09 A device for testing the function of scattered-light smoke sensors
HU9902007A HU222939B1 (hu) 1998-07-10 1999-06-16 Berendezés szórtfényes füstjelző tesztelésére
NO19993153A NO321726B1 (no) 1998-07-10 1999-06-24 Anordning for testing av funksjonen av strolysrokvarslere
KR1019990024565A KR100575903B1 (ko) 1998-07-10 1999-06-28 산란광 연기 센서 기능을 검사하는 장치
DE59904421T DE59904421D1 (de) 1998-07-10 1999-07-01 Vorrichtung zur Überprüfung der Funktion von Streulichtrauchmeldern
EP19990112527 EP0971329B1 (fr) 1998-07-10 1999-07-01 Dispositif permettant de vérifier des détecteurs de fumée du type à diffusion optique
AT99112527T ATE233930T1 (de) 1998-07-10 1999-07-01 Vorrichtung zur überprüfung der funktion von streulichtrauchmeldern
PL334271A PL191875B1 (pl) 1998-07-10 1999-07-08 Urządzenie do kontroli działania czujek dymowych na światło rozproszone
CZ0245399A CZ297192B6 (cs) 1998-07-10 1999-07-09 Zarízení pro prezkusování funkce hlásicu kourem rozptýleného svetla
CN99110442A CN1255695A (zh) 1998-07-10 1999-07-12 检验散射光烟雾报警器功能的装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98112822A EP0971328A1 (fr) 1998-07-10 1998-07-10 Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique

Publications (1)

Publication Number Publication Date
EP0971328A1 true EP0971328A1 (fr) 2000-01-12

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EP98112822A Withdrawn EP0971328A1 (fr) 1998-07-10 1998-07-10 Dispositif permettant de verifier des détecteurs de fumée du type à diffusion optique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7587926B2 (en) * 2006-01-13 2009-09-15 Hsi Fire & Safety Group, Llc Method and apparatus for testing detectors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006412A1 (fr) * 1988-01-04 1989-07-13 Pittway Corporation Appareil de declenchement d'essai a entree continue ou impulsionnelle
WO1994018653A1 (fr) * 1993-02-15 1994-08-18 Cerberus Ag Dispositif permettant de verifier des detecteurs de fumee

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989006412A1 (fr) * 1988-01-04 1989-07-13 Pittway Corporation Appareil de declenchement d'essai a entree continue ou impulsionnelle
WO1994018653A1 (fr) * 1993-02-15 1994-08-18 Cerberus Ag Dispositif permettant de verifier des detecteurs de fumee
EP0636266A1 (fr) * 1993-02-15 1995-02-01 Cerberus Ag Dispositif permettant de verifier des detecteurs de fumee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7587926B2 (en) * 2006-01-13 2009-09-15 Hsi Fire & Safety Group, Llc Method and apparatus for testing detectors

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