DE59208736D1 - Procedure for predicting the time of maintenance of hazard detectors - Google Patents

Procedure for predicting the time of maintenance of hazard detectors

Info

Publication number
DE59208736D1
DE59208736D1 DE59208736T DE59208736T DE59208736D1 DE 59208736 D1 DE59208736 D1 DE 59208736D1 DE 59208736 T DE59208736 T DE 59208736T DE 59208736 T DE59208736 T DE 59208736T DE 59208736 D1 DE59208736 D1 DE 59208736D1
Authority
DE
Germany
Prior art keywords
time
rwx
quiescent value
maintenance
rwb
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 - Fee Related
Application number
DE59208736T
Other languages
German (de)
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
Original Assignee
Siemens 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 AG filed Critical Siemens AG
Application granted granted Critical
Publication of DE59208736D1 publication Critical patent/DE59208736D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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

Landscapes

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

Abstract

A method for predetermining the probable period of time to a no longer permissible change in sensitivity, i.e. the operating life of alarm detectors. In an alarm detector system with quiescent value correction, the probable operating life (tF) of the detector is determined from its change in quiescent value (RWx - RWb) over a certain past period (tV=tx-tb) and its predetermined operating threshold (FS), which can also be a maintenance or disturbance threshold (WS or ST), by extrapolation: tF = (tx-tb) x FS-RWx DIVIDED RWx-RWb , where tx = particular actual time tb = reference time RWx = quiescent value at actual time RWb = quiescent value at reference time. <IMAGE>
DE59208736T 1991-02-26 1992-02-05 Procedure for predicting the time of maintenance of hazard detectors Expired - Fee Related DE59208736D1 (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
DE59208736D1 true DE59208736D1 (en) 1997-09-04

Family

ID=6425926

Family Applications (1)

Application Number Title Priority Date Filing Date
DE59208736T Expired - Fee Related DE59208736D1 (en) 1991-02-26 1992-02-05 Procedure for predicting the time of maintenance of hazard detectors

Country Status (4)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2387969A1 (en) * 2000-08-30 2002-03-07 General Electric Company Computerized method and system for determining degradation of dc link capacitors
FR2829271B1 (en) * 2001-08-28 2005-12-02 J C Decaux TELESURVEILLANCE SYSTEM FOR LUMINOUS DISPLAY DEVICE
WO2005031268A2 (en) * 2003-09-18 2005-04-07 Siemens Aktiengesellschaft Measuring device for detecting a threshold value
GB2537940B (en) 2015-05-01 2018-02-14 Thorn Security Fire detector drift compensation
DE102017200544A1 (en) 2017-01-13 2018-07-19 Siemens Schweiz Ag Determination of a lead time for the replacement of an optical smoke detector depending on its contamination

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 (en) * 1981-07-10 1983-01-27 Siemens AG, 1000 Berlin und 8000 München METHOD AND ARRANGEMENT FOR INCREASING THE SENSITIVITY AND EMERGENCY SAFETY IN A DANGER, IN PARTICULAR FIRE DETECTING SYSTEM
CH669859A5 (en) * 1986-06-03 1989-04-14 Cerberus Ag
US4881060A (en) * 1988-11-16 1989-11-14 Honeywell Inc. Fire alarm system
DE3900456A1 (en) * 1989-01-10 1990-07-12 Heiland Bernd Service indicator module

Also Published As

Publication number Publication date
EP0501194A1 (en) 1992-09-02
ATE156286T1 (en) 1997-08-15
ES2106097T3 (en) 1997-11-01
EP0501194B1 (en) 1997-07-30

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee