JPS5480187A - Gas alarm device - Google Patents
Gas alarm deviceInfo
- Publication number
- JPS5480187A JPS5480187A JP14749777A JP14749777A JPS5480187A JP S5480187 A JPS5480187 A JP S5480187A JP 14749777 A JP14749777 A JP 14749777A JP 14749777 A JP14749777 A JP 14749777A JP S5480187 A JPS5480187 A JP S5480187A
- Authority
- JP
- Japan
- Prior art keywords
- sensor element
- gas
- light
- alarm device
- alarm
- 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
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Fire-Detection Mechanisms (AREA)
- Emergency Alarm Devices (AREA)
Abstract
PURPOSE:To compose a gas alarm device having selectivity to gas and less susceptible to dust or contamination in the air, by converting the change of color of a substance which discolors when coming in contact with gas into an electric signal by means of a photocoupler and displaying an alarm. CONSTITUTION:Ultrafine alumina powder, caustic potash, and suspended solution of pH indicator are deposited on an alumina ceramic substrate measuring about 4 X 4 mm, and dried to form a sensor element. In the sensor chamber shutting off external light, the light from the light source, which is a light emitting diode, is projected to the said sensor element, and the reflected light is received by a silicon photo diode through a filter, and an alarm is issued according to the change in the output thereof. This gas alarm device reacts specifically to carbon dioxide. Substituting for said sensor element, conductive resistance layer is provided on the alumina substrate by evaporating chromium, and palladium salt and tungstate are evaporated thereon and used as a sensor element, which can detect carbon monoxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14749777A JPS5480187A (en) | 1977-12-08 | 1977-12-08 | Gas alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14749777A JPS5480187A (en) | 1977-12-08 | 1977-12-08 | Gas alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5480187A true JPS5480187A (en) | 1979-06-26 |
Family
ID=15431710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14749777A Pending JPS5480187A (en) | 1977-12-08 | 1977-12-08 | Gas alarm device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5480187A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61196204A (en) * | 1985-02-26 | 1986-08-30 | シーメンス、アクチエンゲゼルシヤフト | Optical filter |
| JPS61196142A (en) * | 1985-02-26 | 1986-08-30 | シーメンス、アクチエンゲゼルシヤフト | Chemical sensitive element |
-
1977
- 1977-12-08 JP JP14749777A patent/JPS5480187A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61196204A (en) * | 1985-02-26 | 1986-08-30 | シーメンス、アクチエンゲゼルシヤフト | Optical filter |
| JPS61196142A (en) * | 1985-02-26 | 1986-08-30 | シーメンス、アクチエンゲゼルシヤフト | Chemical sensitive element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Written amendment |
Effective date: 20031205 Free format text: JAPANESE INTERMEDIATE CODE: A523 |
|
| A621 | Written request for application examination |
Effective date: 20031205 Free format text: JAPANESE INTERMEDIATE CODE: A621 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060606 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060906 |
|
| A02 | Decision of refusal |
Effective date: 20061121 Free format text: JAPANESE INTERMEDIATE CODE: A02 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070219 |
|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20070416 |