New! View global litigation for patent families

JPH0282396A - Smoke detector for air cleaner - Google Patents

Smoke detector for air cleaner

Info

Publication number
JPH0282396A
JPH0282396A JP23523488A JP23523488A JPH0282396A JP H0282396 A JPH0282396 A JP H0282396A JP 23523488 A JP23523488 A JP 23523488A JP 23523488 A JP23523488 A JP 23523488A JP H0282396 A JPH0282396 A JP H0282396A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
air
transistor
concentration
circuit
gas
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
Application number
JP23523488A
Inventor
Takaya Uomoto
Original Assignee
Matsushita Seiko Co 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

Links

Abstract

PURPOSE: To highly accurately detect the concentration of a gas with the title detector even when the concentration of contaminants is high without stopping the oscillation of an astable multivibrator circuit by changing the junction of the transistor used for the circuit from NPN to PNP.
CONSTITUTION: When the internal air resistance value of a gas sensor 14 drops due to the concentration of contaminant in air becomes higher, the voltage across both ends of a resistance 15 connected with the sensor 14 in series becomes higher and, when the potential at a prescribed one point becomes lower than that at another prescribed point, a transistor 11 is turned off. However, an astable multivibrator circuit 3 does not stop oscillation, since the circuit 3 uses a PNP junction transistor 3a. Therefore, the detecting range of this sensor 14 is widened and the operation of an apparatus 19 can be controlled in accordance with the contaminated state of air by the operation of a microcomputer 18, because the transistor 17 makes outputs corresponding to the gas concentration until the moment just before the transistor 17 is turned off. Accordingly, the concentration of a gas can be detected with high accuracy without stopping the oscillation of the multivibrator circuit even when the air is highly contaminated.
COPYRIGHT: (C)1990,JPO&Japio
JP23523488A 1988-09-20 1988-09-20 Smoke detector for air cleaner Pending JPH0282396A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23523488A JPH0282396A (en) 1988-09-20 1988-09-20 Smoke detector for air cleaner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23523488A JPH0282396A (en) 1988-09-20 1988-09-20 Smoke detector for air cleaner

Publications (1)

Publication Number Publication Date
JPH0282396A true true JPH0282396A (en) 1990-03-22

Family

ID=16983066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23523488A Pending JPH0282396A (en) 1988-09-20 1988-09-20 Smoke detector for air cleaner

Country Status (1)

Country Link
JP (1) JPH0282396A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182542A (en) * 1991-07-02 1993-01-26 Newtron Products Company Smoke alarm and air cleaning device
US5451929A (en) * 1991-07-02 1995-09-19 Newtron Products Company Smoke alarm and air cleaning device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182542A (en) * 1991-07-02 1993-01-26 Newtron Products Company Smoke alarm and air cleaning device
US5451929A (en) * 1991-07-02 1995-09-19 Newtron Products Company Smoke alarm and air cleaning device

Similar Documents

Publication Publication Date Title
US3906473A (en) Method and apparatus for operating a gas sensor
JPS5511225A (en) Printing density detector
JPH0217912A (en) Air purifier
US3903430A (en) Low loss circuit fail detector
JPS624948A (en) Abnormality judging apparatus for revolution speed sensors
JPS62233710A (en) Face inspection instrument
JPS62240816A (en) Abnormality detector for pulse output type sensor
JPH04308360A (en) Internal combustion engine misfire detecting device and internal combustion engine control device using this misfire detecting device
JPH02151724A (en) Method for detecting dripping of liquid and dripping detector of liquid
JPH02143121A (en) Electromagnetic flowmeter
JPS57182153A (en) Gas detector
JPH0330097A (en) Photoelectric smoke sensor
JPH0462439A (en) Wire breaking detecting circuit of temperature measuring instrument
JPH0348166A (en) Air flow sensor
JPH02114164A (en) Gas detector
JPS5693038A (en) Semiconductor gas sensor
JPS61200348A (en) Air-fuel ratio control system
JPH0219771A (en) Calibrating device for acceleration sensor of automobile
JPS59163556A (en) Oxygen concentration detecting apparatus
JPH0497614A (en) Touch sensor device
JPS62225797A (en) Pump device
JPH0464563A (en) Controller for machining web
JPH04175439A (en) Water temperature abnormality detection device
JPS625184A (en) Lateral acceleration detector
JPS5657943A (en) Smoke sensing system