EP 0501194 B1 19970730 - Method of predetermining the time of maintenance of alarm detectors
Title (en)
Method of predetermining the time of maintenance of alarm detectors
Title (de)
Verfahren zur Vorausbestimmung des Wartungszeitpunktes von Gefahrenmeldern
Title (fr)
Procédé pour déterminer en avance le moment de la maintenance de détecteurs d'alarmes
Publication
Application
Priority
DE 4106025 A 19910226
Abstract (en)
[origin: EP0501194A1] 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>
IPC 1-7
IPC 8 full level
G08B 29/14 (2006.01); G08B 31/00 (2006.01)
CPC (source: EP)
G08B 29/145 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0501194 A1 19920902; EP 0501194 B1 19970730; AT E156286 T1 19970815; DE 59208736 D1 19970904; ES 2106097 T3 19971101
DOCDB simple family (application)
EP 92101904 A 19920205; AT 92101904 T 19920205; DE 59208736 T 19920205; ES 92101904 T 19920205