JPS5449197A - Ion type smoke sensor - Google Patents
Ion type smoke sensorInfo
- Publication number
- JPS5449197A JPS5449197A JP11545077A JP11545077A JPS5449197A JP S5449197 A JPS5449197 A JP S5449197A JP 11545077 A JP11545077 A JP 11545077A JP 11545077 A JP11545077 A JP 11545077A JP S5449197 A JPS5449197 A JP S5449197A
- Authority
- JP
- Japan
- Prior art keywords
- smoke
- ion chamber
- fet
- electrodes
- chamber
- 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
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE: To detect smoke at high sensitivity with scarce effects of temperature by feeding back part of output of amplifier to detect the change of impedance due to smoke into an ion chamber for measurement and keeping the ion chamber at a certain voltage.
CONSTITUTION: In a reference ion chamber Ac which does not permit invasion of smoke, and an ion chamber for measurement Bc which pemits free invasion of smoke, electrodes 4, 5 coated with radioactive substance 3 are respectively provided opposite to electrodes 1, 2. The electrodes in chambers Ac, Bc are connected in series to applied power sources L1, L2. But chamber Bc is not directly connected to power source L2, but is connected, together with switch 7, to a middle point 9 of series circuit of resistor R having one end connected to power source L2 and Zener diode ZD having one end connected to the source of FET 8. The connection point 6 chambers Ac and Bc is connected to the gate of FET 8. In this setting, due to the output of FET 8 when smoke invades, the smoke is detected by the switch part 7 which short-circuits the power sources L1 and L2 at a low impedance
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11545077A JPS5449197A (en) | 1977-09-26 | 1977-09-26 | Ion type smoke sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11545077A JPS5449197A (en) | 1977-09-26 | 1977-09-26 | Ion type smoke sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5449197A true JPS5449197A (en) | 1979-04-18 |
JPS6122778B2 JPS6122778B2 (en) | 1986-06-03 |
Family
ID=14662842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11545077A Granted JPS5449197A (en) | 1977-09-26 | 1977-09-26 | Ion type smoke sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5449197A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8742196B2 (en) | 2007-02-19 | 2014-06-03 | Ray Arbesman | Precut adhesive body support articles and support system |
USD737986S1 (en) | 2013-05-29 | 2015-09-01 | Spidertech Inc. | Kinesiology tape strip with release liner grid lines |
-
1977
- 1977-09-26 JP JP11545077A patent/JPS5449197A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8742196B2 (en) | 2007-02-19 | 2014-06-03 | Ray Arbesman | Precut adhesive body support articles and support system |
US9833351B2 (en) | 2007-02-19 | 2017-12-05 | Spidertech Inc. | Precut adhesive body support articles and support system |
USD737986S1 (en) | 2013-05-29 | 2015-09-01 | Spidertech Inc. | Kinesiology tape strip with release liner grid lines |
Also Published As
Publication number | Publication date |
---|---|
JPS6122778B2 (en) | 1986-06-03 |
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