JPS647396U - - Google Patents
Info
- Publication number
- JPS647396U JPS647396U JP10051087U JP10051087U JPS647396U JP S647396 U JPS647396 U JP S647396U JP 10051087 U JP10051087 U JP 10051087U JP 10051087 U JP10051087 U JP 10051087U JP S647396 U JPS647396 U JP S647396U
- Authority
- JP
- Japan
- Prior art keywords
- sensitivity
- detection
- switching circuit
- switches
- smoke
- 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
- 230000035945 sensitivity Effects 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 11
- 239000000779 smoke Substances 0.000 claims 8
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Description
第１図は本考案の一実施例を示した回路図、第
２図は本考案の他の実施例を示した回路図、第３
図は従来例を示した回路図である。
１……ＳＣＲ（高感度用）、２……ＳＣＲ（低
感度用）、３……定電圧回路、４……発信回路、
５……発光素子、６……受光素子、７……比較回
路、９，１０……Ｄ―ＦＦ、１５……ダイオード
ブリツジ、１６……トランジスタ、１７，１９，
２０，２３……インバータ、１８，２１，２２…
…ＮＯＲゲート、ＺＤ１……ツエナーダイオード
（電圧検出用）、Ｓ１〜Ｓ４……アナログスイツ
チ。
Fig. 1 is a circuit diagram showing one embodiment of the invention, Fig. 2 is a circuit diagram showing another embodiment of the invention, and Fig. 3 is a circuit diagram showing another embodiment of the invention.
The figure is a circuit diagram showing a conventional example. 1...SCR (for high sensitivity), 2...SCR (for low sensitivity), 3...constant voltage circuit, 4...transmission circuit,
5... Light emitting element, 6... Light receiving element, 7... Comparison circuit, 9, 10... D-FF, 15... Diode bridge, 16... Transistor, 17, 19,
20, 23... Inverter, 18, 21, 22...
...NOR gate, ZD1... Zener diode (for voltage detection), S1 to S4... analog switch.
Claims (1)
して火災検出信号を送出する高感度用スイツチン
グ回路と、前記電源兼用信号線とは異なる別の電
源兼用信号線間をスイツチングして火災検出信号
を送出する低感度用スイツチング回路と、火災に
より発生する煙を検出したときに出力する煙検出
部と、該煙検出部の検出感度を高感度と低感度と
の２段階に切換える感度切換部と、定常監視状態
で前記感度切換部を高感度状態に切換えると共に
前記煙検出部の出力を前記高感度用スイツチング
回路に供給し、該高感度監視状態で前記煙検出部
の検出出力により前記高感度用スイツチング回路
が動作して火災信号を送出した時に、前記感度切
換部を低感度に切換えると共に前記煙検出部の出
力を前記低感度用スイツチング回路に切換える感
度切換制御部とを備えた２感度式煙感知器に於い
て、 前記高感度スイツチング回路に対する電源兼用
信号線の電圧を監視し、該線路電圧が所定値以下
となつた時に前記感度切換制御部に高感度から低
感度へ切換える検出出力を生ずる電圧検出手段を
設けたことを特徴とする２感度式煙感知器。[Scope of Claim for Utility Model Registration] A high-sensitivity switching circuit that sends out a fire detection signal by switching between power and signal lines from a receiver, and another power and signal line that is different from the power and signal line. A low-sensitivity switching circuit that switches to send out a fire detection signal, a smoke detection section that outputs an output when smoke generated by a fire is detected, and a two-stage detection sensitivity of the smoke detection section: high sensitivity and low sensitivity. a sensitivity switching section that switches the sensitivity switching section to a high-sensitivity state in a steady monitoring state and supplies the output of the smoke detection section to the high-sensitivity switching circuit; a sensitivity switching control unit that switches the sensitivity switching unit to low sensitivity and switches the output of the smoke detection unit to the low sensitivity switching circuit when the high sensitivity switching circuit is operated by the detection output and sends out a fire signal; In a dual-sensitivity smoke detector equipped with a dual-sensitivity type smoke detector, the voltage of the signal line that also serves as a power supply for the high-sensitivity switching circuit is monitored, and when the line voltage falls below a predetermined value, the sensitivity switching control section is switched from high sensitivity to low sensitivity. A dual-sensitivity type smoke detector, characterized in that it is provided with voltage detection means that generates a detection output that switches to sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10051087U JPH0517755Y2 (en) | 1987-06-30 | 1987-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10051087U JPH0517755Y2 (en) | 1987-06-30 | 1987-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS647396U true JPS647396U (en) | 1989-01-17 |
| JPH0517755Y2 JPH0517755Y2 (en) | 1993-05-12 |
Family
ID=31328648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10051087U Expired - Lifetime JPH0517755Y2 (en) | 1987-06-30 | 1987-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0517755Y2 (en) |
-
1987
- 1987-06-30 JP JP10051087U patent/JPH0517755Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0517755Y2 (en) | 1993-05-12 |
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