JPS5530663A - Detecting and controlling device of air polluting gase - Google Patents

Detecting and controlling device of air polluting gase

Info

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
Application number
JP10416378A
Other languages
Japanese (ja)
Other versions
JPH0262816B2 (en
Inventor
Yukio Ashizawa
Koichi Koga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP10416378A priority Critical patent/JPS5530663A/en
Publication of JPS5530663A publication Critical patent/JPS5530663A/en
Publication of JPH0262816B2 publication Critical patent/JPH0262816B2/ja
Granted legal-status Critical Current

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
JP10416378A 1978-08-26 1978-08-26 Detecting and controlling device of air polluting gase Granted JPS5530663A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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