JPS5483878A - Smoke sensor - Google Patents
Smoke sensorInfo
- Publication number
- JPS5483878A JPS5483878A JP15188877A JP15188877A JPS5483878A JP S5483878 A JPS5483878 A JP S5483878A JP 15188877 A JP15188877 A JP 15188877A JP 15188877 A JP15188877 A JP 15188877A JP S5483878 A JPS5483878 A JP S5483878A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- light
- smoke
- comparator
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE: To obviate the drawback that the output of a smoke sensor is reduced to zero in the presence of smoke due to deterioration in the function of a portion of sensor by attaching a circuit, to which an operation confirming function is added, to the smoke sensor.
CONSTITUTION: A scattered light receiver 4 receives the light which is scattered in the presence of smoke from the light of a light emitting element 3. The reference voltage 7 of a comparator 6 is so preset that the output 9 of a smoke sensor is not generated even with the background under a normal operation but is generated when a preset of smoke prevails. If the control voltage from a control circuit 1 to a power source circuit 2 is raised in accordance with the command from the outside merely for confirmation, the quantity of the light from the light emitting element 3 is so increased that the quantities of the scattered light and the background are accordingly increaed. At the same time,the valtage 7 is interchanged to render the comparator 6 operative. When the circuit 1 is normal, a preset voltage is fed to the circuit 2, and the output of the light receiver 4 is compared through an amplifier 5 with the voltage 7 by means of the comparator 6 so that an output circuit 8 generates the output 9 in accordance with the output of the comparator 6.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15188877A JPS6041794B2 (en) | 1977-12-16 | 1977-12-16 | Smoke detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15188877A JPS6041794B2 (en) | 1977-12-16 | 1977-12-16 | Smoke detectors |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22715384A Division JPS60185141A (en) | 1984-10-29 | 1984-10-29 | Smoke detecting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5483878A true JPS5483878A (en) | 1979-07-04 |
| JPS6041794B2 JPS6041794B2 (en) | 1985-09-18 |
Family
ID=15528389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15188877A Expired JPS6041794B2 (en) | 1977-12-16 | 1977-12-16 | Smoke detectors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6041794B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60118997A (en) * | 1983-11-30 | 1985-06-26 | 松下電工株式会社 | Intelligence type smoke sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200038750A (en) | 2018-10-04 | 2020-04-14 | 한국전력공사 | Boiler tube heat resistance evaluation method and heat resistance evaluation device using the same |
-
1977
- 1977-12-16 JP JP15188877A patent/JPS6041794B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60118997A (en) * | 1983-11-30 | 1985-06-26 | 松下電工株式会社 | Intelligence type smoke sensor |
| JPH0563839B2 (en) * | 1983-11-30 | 1993-09-13 | Matsushita Electric Works Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6041794B2 (en) | 1985-09-18 |
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