JPS5679921A - Fire detector - Google Patents
Fire detectorInfo
- Publication number
- JPS5679921A JPS5679921A JP15834779A JP15834779A JPS5679921A JP S5679921 A JPS5679921 A JP S5679921A JP 15834779 A JP15834779 A JP 15834779A JP 15834779 A JP15834779 A JP 15834779A JP S5679921 A JPS5679921 A JP S5679921A
- Authority
- JP
- Japan
- Prior art keywords
- fire
- voltage
- timing generating
- generating circuit
- fluctuating
- 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
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE:To enable one device to detect a fire, smoke and temperature rise in their early stages by receiving various alarms from voltage comparing circuits by providing a timing generating circuit which sends out alternate on and off signals at constant intervals. CONSTITUTION:For example, if a fire occurs when output 01 of timing generating circuit T is in the off state, fluctuating voltage 03, outputted by photoelectric element PT, fluctuating by ultravoilet radiation has only a frequency component, characteristic to the fire, passed. The fluctuating voltage appears at output 05 by way of filter (f), amplifier AMP and smoothing circuit S. If the fluctuations of this voltage continue for a certain time and its level rises above a set value, voltage comparing circuit COM1 operating only during the off period of timing generating circuit T outputs a fire occurrence alarm. Similarly, smoke and a rise in temperature can be detected by one device in their early stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15834779A JPS5679921A (en) | 1979-12-06 | 1979-12-06 | Fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15834779A JPS5679921A (en) | 1979-12-06 | 1979-12-06 | Fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5679921A true JPS5679921A (en) | 1981-06-30 |
Family
ID=15669652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15834779A Pending JPS5679921A (en) | 1979-12-06 | 1979-12-06 | Fire detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5679921A (en) |
-
1979
- 1979-12-06 JP JP15834779A patent/JPS5679921A/en active Pending
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