JPS5555247A - Ionization system smoke sensor - Google Patents
Ionization system smoke sensorInfo
- Publication number
- JPS5555247A JPS5555247A JP12900778A JP12900778A JPS5555247A JP S5555247 A JPS5555247 A JP S5555247A JP 12900778 A JP12900778 A JP 12900778A JP 12900778 A JP12900778 A JP 12900778A JP S5555247 A JPS5555247 A JP S5555247A
- Authority
- JP
- Japan
- Prior art keywords
- smoke
- response properties
- ionization
- ionization chambers
- electrodes
- 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
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE: To improve reliability, by mounting two ionization chambers separately.
CONSTITUTION: Two ionization chambers 2f, 2s are installed which are manufactured so that the same V-I characteristics be obtained by making the shape, radiation source quantity, etc. of electrodes a, b identical while response properties to smoke are differ by enlarging one opening portion 10 more than the other opening portion 11, and the electrodes a, b are connected to an alarm device 9 through an amplifier 4, a differential amplifier 5, threshold discriminating circuits 6, 7 and an AND circuit 8. Consequently, the ionization current reducing rates of the ionization chambers 2f, 2s by smoke are affected only by the concentration of smoke under a stationary condition and have no connection with the response properties, but the rates change according to the extent of the openings when air curretns, thus decreasing the possibility of false operation to strong air currents without lowering the response properties of this sensor to smoke.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12900778A JPS5555247A (en) | 1978-10-18 | 1978-10-18 | Ionization system smoke sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12900778A JPS5555247A (en) | 1978-10-18 | 1978-10-18 | Ionization system smoke sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5555247A true JPS5555247A (en) | 1980-04-23 |
Family
ID=14998844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12900778A Pending JPS5555247A (en) | 1978-10-18 | 1978-10-18 | Ionization system smoke sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5555247A (en) |
-
1978
- 1978-10-18 JP JP12900778A patent/JPS5555247A/en active Pending
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