JPS5530663A - Detecting and controlling device of air polluting gase - Google Patents
Detecting and controlling device of air polluting gaseInfo
- Publication number
- JPS5530663A JPS5530663A JP10416378A JP10416378A JPS5530663A JP S5530663 A JPS5530663 A JP S5530663A JP 10416378 A JP10416378 A JP 10416378A JP 10416378 A JP10416378 A JP 10416378A JP S5530663 A JPS5530663 A JP S5530663A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- sensor
- output
- time constant
- level
- 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
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
PURPOSE: To automatically shift the operating point to the output level of clean air thereby to maintain the sensitivity constant by combining a metal oxide sensor with a sensor output holding circuit having a high time constant.
CONSTITUTION: A metal oxide sensor 1 connected with a power source 2 is combined with a sensor output holding circuit 15 which is composed of a capacitor 8 having a high discharge time constant and a resistor 9. If there is a change in the output voltage VA of the sensor, the output voltage VX1 of the circuit 15 is always automatically controlled to have a relationship of VX1=VA. Here, since the discharge time constant is set at a level as high as the changes in temperature or humidity, the voltage VX1 is hardly varied for the abrupt fluctuations in the voltage VA. As a result, the voltage VX1 follows the sensor voltage VA to generate a control voltage when a preset voltage VX2 is exceeded. Thus, the operating point of the sensor is automatically shifted to the level under a clean air condition so that the sensitivity can be maintained constant.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10416378A JPS5530663A (en) | 1978-08-26 | 1978-08-26 | Detecting and controlling device of air polluting gase |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10416378A JPS5530663A (en) | 1978-08-26 | 1978-08-26 | Detecting and controlling device of air polluting gase |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5530663A true JPS5530663A (en) | 1980-03-04 |
JPH0262816B2 JPH0262816B2 (en) | 1990-12-26 |
Family
ID=14373378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10416378A Granted JPS5530663A (en) | 1978-08-26 | 1978-08-26 | Detecting and controlling device of air polluting gase |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5530663A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6298249A (en) * | 1985-10-25 | 1987-05-07 | Matsushita Electric Works Ltd | Gas detecting circuit for gas leakage alarm |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5019398A (en) * | 1973-01-13 | 1975-02-28 | ||
JPS5143359A (en) * | 1974-10-11 | 1976-04-14 | Nippon Benkan Kogyo Kk | Wankyokukanno seizohoho oyobisono sochi |
-
1978
- 1978-08-26 JP JP10416378A patent/JPS5530663A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5019398A (en) * | 1973-01-13 | 1975-02-28 | ||
JPS5143359A (en) * | 1974-10-11 | 1976-04-14 | Nippon Benkan Kogyo Kk | Wankyokukanno seizohoho oyobisono sochi |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6298249A (en) * | 1985-10-25 | 1987-05-07 | Matsushita Electric Works Ltd | Gas detecting circuit for gas leakage alarm |
JPH0438311B2 (en) * | 1985-10-25 | 1992-06-24 |
Also Published As
Publication number | Publication date |
---|---|
JPH0262816B2 (en) | 1990-12-26 |
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