EP0501194B1 - Procédé pour déterminer en avance le moment de la maintenance de détecteurs d'alarmes - Google Patents

Procédé pour déterminer en avance le moment de la maintenance de détecteurs d'alarmes Download PDF

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Publication number
EP0501194B1
EP0501194B1 EP92101904A EP92101904A EP0501194B1 EP 0501194 B1 EP0501194 B1 EP 0501194B1 EP 92101904 A EP92101904 A EP 92101904A EP 92101904 A EP92101904 A EP 92101904A EP 0501194 B1 EP0501194 B1 EP 0501194B1
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EP
European Patent Office
Prior art keywords
time
threshold
detector
functional
maintenance
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 - Lifetime
Application number
EP92101904A
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German (de)
English (en)
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EP0501194A1 (fr
Inventor
Otto Walter Dipl.-Ing. Moser
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 AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0501194A1 publication Critical patent/EP0501194A1/fr
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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 invention relates to a maintenance method according to the preamble of claim 1.
  • Hazard detectors preferably smoke detectors
  • the susceptibility to false alarms does not increase sharply due to an increase in sensitivity, and that the expected scope of protection can no longer be guaranteed by reducing the sensitivity, such changes in sensitivity must be recognized in good time.
  • danger detection systems with limit detectors are also known, in which it can be determined during normal operation of the danger detection system whether the detector sensitivity has changed. For example, detector signals are changed by special tactile routines such that these detectors must trigger an alarm at one time and not trigger an alarm in the other. It is also possible to issue a warning by introducing additional monitoring thresholds if they are exceeded or not reached. Due to these measures, changes in sensitivity can be recognized and false alarms are reduced. However, significant changes in responsiveness are admittedly allowed up to this point. This measure is mainly based on economic considerations, because if the warning were given too early, the operating time of the detectors would be significantly shortened, which would result in higher costs for the detector replacement.
  • a prediction device for a maintenance and inspection time is known from the patent abstract of the Japanese patent publication JP 215 35 00. It can only be inferred from the abstract that the maintenance and inspection time can be derived with a permissible deviation by predicting how the work has been carried out from that time based on current results of a work in the past and a work model and by estimating the maintenance. and inspection time for the future. For this purpose, output data from a detection means are processed with several calculation devices. A precise way of working is not to be found in the abstract.
  • the object of the invention is for hazard detection systems with rest value tracking and sliding alarm calculation threshold to specify a procedure which allows the expected service life of the detector to be predetermined with regard to its functionality, taking current and past data into account.
  • the expected detector life is extrapolated for each detector from its change in idle value over a specific, past time and from its predetermined functional threshold, which could be clearly identical, for example, to a threshold already present in the system (maintenance or fault threshold), rather, its probable duration of service is determined.
  • the period of functional reliability is therefore predetermined, in general with constant environmental influences. This enables the maintenance technician to determine, for example, regular maintenance by entering the time interval until the next maintenance appointment, all detectors that are likely to reach the functional threshold by then, and then to replace them at the same time.
  • the method according to the invention has the advantage that only soiled detectors can be replaced without causing additional maintenance costs and travel times.
  • the detector life is calculated by multiplying the difference between an actual point in time and a reference point in the past by a quotient, which is the difference between the function threshold and the detector idle value at the actual point in time and from the difference between the detector idle value at the actual time and the reference rest value.
  • the functional threshold is formed by an upper or lower threshold value, above which the detector is no longer functional, as will be described later. This can be an upper or lower maintenance threshold or fault threshold.
  • those detectors are therefore advantageously determined and displayed from the calculated expected functional duration of the individual detectors which reach or exceed the respectively predefined functional threshold by a certain later point in time, for example the period until the next maintenance.
  • the time until the next maintenance appointment is derived.
  • the detector measured value MW is recorded over the time t, which can be months or years depending on the operating conditions.
  • the detector measured value MW changes due to the contamination of the limit detector, whereby the sensitivity increases.
  • the detector measured value MW increases from the initial measured value MWa over a certain period of time and then exceeds an upper monitoring threshold ÜSo, which is intended to indicate that the detector is no longer functional above this threshold.
  • ÜSo upper monitoring threshold
  • it reaches the alarm threshold AS and thus emits a false alarm F-AL due to the increase in sensitivity.
  • the detector measured value MW changes from an initial measured value MWa below and at a time tK reaches a lower monitoring threshold USu, which generally does not lead to a message.
  • This threshold should also indicate that the detector no longer functions properly below the threshold. If such a limit detector can not report that its sensitivity has exceeded a lower monitoring threshold ÜSu, then the detector remains in the system until the next exchange cycle, and an occurring danger can no longer be indicated, because the alarm threshold AS is also present Hazard event no longer reached and an alarm is therefore no longer displayed.
  • the dirty detector could only be replaced in good time if these monitoring thresholds lead to a message.
  • the detector idle value RW is tracked and the alarm calculation threshold ABS is also carried out in a "sliding" manner, the detector sensitivity remains constant over the entire working range.
  • Fig. 4 the influence of pollution with decreasing detector idle value is very similar to that in Fig. 3 shown with increasing detector idle value. If the detector idle value RW exceeds its working range AB due to the soiling, the maintenance threshold WSu is exceeded first, which is displayed, and later the fault threshold Stu is exceeded, which is also displayed. At least at this point, the detector must be replaced.
  • the rest value RW over time t shows the rest value RW over time t.
  • the working area AB of the pulse detector is limited by the upper and lower interference threshold STo and STu and identifies the interference area SB.
  • the sliding alarm calculation threshold ABS is shown for the changing detector idle value RW.
  • the change in the rest value in the past tV is determined from a specific reference time tb to a specific actual time tx.
  • An actual idle value RWx results at the actual time tx, which can be, for example, the maintenance time.
  • the function duration tF up to the function threshold FS can then be calculated by extrapolation according to the given equation. If the change in idle value increases, this is the upper function threshold SFo, as shown in FIG. 5, if the idle value change falls, this is the lower function threshold SFu.
  • those detectors of the hazard alarm system are determined and displayed which reach or exceed the functional threshold within a certain period of time, which can be, for example, the interval between two maintenance intervals,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire Alarms (AREA)

Claims (2)

  1. Procédé de maintenance, dans lequel le temps de maintenance est déterminé à l'avance en considération de données actuelles et passées d'une installation de détection de dangers, qui fonctionne avec restitution de la valeur au repos, dans lequel est calculée la durée de fonctionnement des détecteurs de danger, c'est-à-dire la durée vraisemblable jusqu'à une modification qui n'est plus admissible de la sensibilité de chaque détecteur, caractérisé en ce que la durée vraisemblable de fonctionnement (tF) est déterminée par extrapolation à partir de sa modification de valeur au repos (Rwx - Rwb) sur une certaine période de temps du passé (tV) et de son seuil de fonctionnement (FS) défini à l'avance, la durée de fonctionnement (tF) étant calculée à partir de la différence du moment réel (tx) et du moment de référence (tb) multipliée par le quotient formé à partir de la différence du seuil de fonctionnement (FS) et de la valeur au repos du détecteur au moment réel (Rwx) et de la différence de la valeur au repos du détecteur au moment réel (Rwx) et de la valeur au repos de référence, auquel cas est pris pour base lors d'une modification croissante de la valeur au repos, un seuil de fonctionnement supérieur (FSo), et lors d'une modification décroissante de la valeur au repos, un seuil de fonctionnement inférieur (Fsu), et le seuil de fonctionnement (FS) peut être fixé par la zone d'action (AB) et un seuil de maintenance ou un seuil de défaillance (ST) du détecteur.
  2. Procédé selon la revendication 1, caractérisé en ce qu'à partir de la durée de fonctionnement prévisible calculée des divers détecteurs, sont déterminés et indiqués les détecteurs de l'installation de détection de dangers qui, jusqu'à un certain moment ultérieur déterminé, par exemple le laps de temps jusqu'à la maintenance suivante, atteignent ou franchissent le seuil de fonctionnement défini à l'avance.
EP92101904A 1991-02-26 1992-02-05 Procédé pour déterminer en avance le moment de la maintenance de détecteurs d'alarmes Expired - Lifetime EP0501194B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4106025 1991-02-26
DE4106025 1991-02-26

Publications (2)

Publication Number Publication Date
EP0501194A1 EP0501194A1 (fr) 1992-09-02
EP0501194B1 true EP0501194B1 (fr) 1997-07-30

Family

ID=6425926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92101904A Expired - Lifetime EP0501194B1 (fr) 1991-02-26 1992-02-05 Procédé pour déterminer en avance le moment de la maintenance de détecteurs d'alarmes

Country Status (4)

Country Link
EP (1) EP0501194B1 (fr)
AT (1) ATE156286T1 (fr)
DE (1) DE59208736D1 (fr)
ES (1) ES2106097T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002018962A1 (fr) * 2000-08-30 2002-03-07 General Electric Company Procede et systeme informatises permettant de determiner la degradation de condensateurs de liaison a courant continu
FR2829271B1 (fr) * 2001-08-28 2005-12-02 J C Decaux Systeme de telesurveillance pour dispositif d'affichage lumineux
WO2005031268A2 (fr) * 2003-09-18 2005-04-07 Siemens Aktiengesellschaft Dispositif de mesure pour la detection de valeur limite
GB2537940B (en) * 2015-05-01 2018-02-14 Thorn Security Fire detector drift compensation
DE102017200544A1 (de) 2017-01-13 2018-07-19 Siemens Schweiz Ag Bestimmung einer Vorlaufzeit für den Austausch eines optischen Rauchmelders in Abhängigkeit seiner Verschmutzung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA785255B (en) * 1978-09-15 1979-12-27 Anglo Amer Corp South Africa Alarm system
DE3127324A1 (de) * 1981-07-10 1983-01-27 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur erhoehung der ansprechempfindlichkeit und der stoersicherheit in einer gefahren-, insbesondere brandmeldeanlage
CH669859A5 (fr) * 1986-06-03 1989-04-14 Cerberus Ag
US4881060A (en) * 1988-11-16 1989-11-14 Honeywell Inc. Fire alarm system
DE3900456A1 (de) * 1989-01-10 1990-07-12 Heiland Bernd Wartungs- (service-) anzeige-modul

Also Published As

Publication number Publication date
ATE156286T1 (de) 1997-08-15
EP0501194A1 (fr) 1992-09-02
DE59208736D1 (de) 1997-09-04
ES2106097T3 (es) 1997-11-01

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