JPS564024A - Heat detection alarming device - Google Patents
Heat detection alarming deviceInfo
- Publication number
- JPS564024A JPS564024A JP7962479A JP7962479A JPS564024A JP S564024 A JPS564024 A JP S564024A JP 7962479 A JP7962479 A JP 7962479A JP 7962479 A JP7962479 A JP 7962479A JP S564024 A JPS564024 A JP S564024A
- Authority
- JP
- Japan
- Prior art keywords
- time constant
- heat sensitive
- output
- heat
- sensitive element
- 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
Abstract
PURPOSE: To remove the air current speed dependency of an alarming device by providing a difference detecting circuit producing output corresponding to the increasing ratio of the ambient temperature, a time constant circuit connected to its output end and generating output corresponding to the gradient of the output, and means for generating an alarm when the output exceeds a predetermined value.
CONSTITUTION: A detection circuit 1 is constituted by a heat sensitive element Rs having a small heat time constant, for example, in the order of one minute, and a heat sensitive element Rs' having a large heat time constant in the order of 10min, both heat sensitive elements having substantially equal electrical characteristics. The heat sensitive element Rs sufficiently pursues the fluctuation of the ambient temperature. The time constant of a time constant circuit 2 is not affected so much with respect to the rapid temperature rise at the time of fire, and is determined to a value close to or slightly more than the heat time constant of the heat sensitive element Rs. A voltage signal proportional to the temperature difference between the heat sensitive elements Rs and Rs' is differentiated by a time constant circuit 2 and the output is compared with a reference voltage in a comparison circuit 3, and an alarm device 5 emits an alarm through a differential amplifier DA and a transistor T1. This alarm device does not depend upon the air current speed.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54079624A JPS5849811B2 (en) | 1979-06-26 | 1979-06-26 | heat detection alarm device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54079624A JPS5849811B2 (en) | 1979-06-26 | 1979-06-26 | heat detection alarm device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS564024A true JPS564024A (en) | 1981-01-16 |
JPS5849811B2 JPS5849811B2 (en) | 1983-11-07 |
Family
ID=13695219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54079624A Expired JPS5849811B2 (en) | 1979-06-26 | 1979-06-26 | heat detection alarm device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5849811B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53122729A (en) * | 1977-03-31 | 1978-10-26 | Shin Kobe Electric Machinery | Method of manufacturing alkaline battery |
JPS594455U (en) * | 1982-07-01 | 1984-01-12 | 日本重化学工業株式会社 | Device for measuring temperature abnormalities in wells |
JPH0285993A (en) * | 1988-03-28 | 1990-03-27 | Matsushita Electric Works Ltd | Semiconductor type heat sensor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5031029A (en) * | 1973-05-30 | 1975-03-27 |
-
1979
- 1979-06-26 JP JP54079624A patent/JPS5849811B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5031029A (en) * | 1973-05-30 | 1975-03-27 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53122729A (en) * | 1977-03-31 | 1978-10-26 | Shin Kobe Electric Machinery | Method of manufacturing alkaline battery |
JPS594455U (en) * | 1982-07-01 | 1984-01-12 | 日本重化学工業株式会社 | Device for measuring temperature abnormalities in wells |
JPH0285993A (en) * | 1988-03-28 | 1990-03-27 | Matsushita Electric Works Ltd | Semiconductor type heat sensor |
Also Published As
Publication number | Publication date |
---|---|
JPS5849811B2 (en) | 1983-11-07 |
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