JPS54158900A - Fire alarm system - Google Patents
Fire alarm systemInfo
- Publication number
- JPS54158900A JPS54158900A JP6754178A JP6754178A JPS54158900A JP S54158900 A JPS54158900 A JP S54158900A JP 6754178 A JP6754178 A JP 6754178A JP 6754178 A JP6754178 A JP 6754178A JP S54158900 A JPS54158900 A JP S54158900A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- detectors
- signals
- receiver
- stand
- 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.)
- Pending
Links
Landscapes
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
PURPOSE: To prevent malfunction and also to reduce power consumption by providing more than two constantly-supervisory and stand-by fire detectors in the same precaution areas and by driving a receiver responding only to the logical sum among signals from those detectors.
CONSTITUTION: In the same precaution area, superviosry detector 5 available for constant operation and stand-by detector 8 applied with a voltage via switching circuit 9 are both provided and the receiver is driven responding only to the logical sum between signals from detectors 5 and 8. If a fire occurs, switching circuit 9 turns ON through the operation of detector 5 and detector 8 starts operating. Logic circuit 12 operates by signals from the both, thereby sending an alarm signal to the receiver. Only detector 5 among detectors consumes power constantly, so that the whole power consumption can be reduced. In addition, even if detector 5 would malfunction due to momentary power variation, detector 8 is never influenced by power variation at the same time, so that an alarm signal will never be generated by mistake.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6754178A JPS54158900A (en) | 1978-06-05 | 1978-06-05 | Fire alarm system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6754178A JPS54158900A (en) | 1978-06-05 | 1978-06-05 | Fire alarm system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54158900A true JPS54158900A (en) | 1979-12-15 |
Family
ID=13347926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6754178A Pending JPS54158900A (en) | 1978-06-05 | 1978-06-05 | Fire alarm system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54158900A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015118421A (en) * | 2013-12-17 | 2015-06-25 | ホーチキ株式会社 | Fire alarm facility |
-
1978
- 1978-06-05 JP JP6754178A patent/JPS54158900A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015118421A (en) * | 2013-12-17 | 2015-06-25 | ホーチキ株式会社 | Fire alarm facility |
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