JPH01302151A - Gas detector - Google Patents

Gas detector

Info

Publication number
JPH01302151A
JPH01302151A JP13337288A JP13337288A JPH01302151A JP H01302151 A JPH01302151 A JP H01302151A JP 13337288 A JP13337288 A JP 13337288A JP 13337288 A JP13337288 A JP 13337288A JP H01302151 A JPH01302151 A JP H01302151A
Authority
JP
Japan
Prior art keywords
voltage
power source
conversion circuit
commercial power
gas sensor
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
JP13337288A
Other languages
Japanese (ja)
Inventor
Takahiro Asai
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
Application filed by Matsushita Seiko Co Ltd filed Critical Matsushita Seiko Co Ltd
Priority to JP13337288A priority Critical patent/JPH01302151A/en
Publication of JPH01302151A publication Critical patent/JPH01302151A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect an electric resistance value of a gas sensor accurately, by varying an input voltage of an A/D conversion circuit with respect to the gas sensor receiving a commercial power source applied in proportion to a change in the commercial power source.
CONSTITUTION: A power source circuit 1 receives an input from a commercial power source to be supply a DC voltage to an A/D conversion circuit 3 through a built-in transformer 1a. A voltage conversion circuit which converts an electric resistance value of a gas sensor 4 connected to the commercial power source into a DC voltage inputs the DC voltage to the A/D conversion circuit 3 for detecting a gas density. In the A/D conversion circuit 3, when a voltage value V2 outputted from a voltage conversion circuit 2 is detected, a voltage value V2 changes in proportion to a commercial power source voltage V while a power source voltage (V1+V2) of the A/D conversion circuit does so. Thus, effect of variations in the commercial power source voltage V can be removed by operating the A/D conversion circuit by a ratio calculation thereby enabling accurate detection of an electric resistance value of the gas sensor 4.
COPYRIGHT: (C)1989,JPO&Japio
JP13337288A 1988-05-31 1988-05-31 Gas detector Pending JPH01302151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13337288A JPH01302151A (en) 1988-05-31 1988-05-31 Gas detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13337288A JPH01302151A (en) 1988-05-31 1988-05-31 Gas detector

Publications (1)

Publication Number Publication Date
JPH01302151A true JPH01302151A (en) 1989-12-06

Family

ID=15103188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13337288A Pending JPH01302151A (en) 1988-05-31 1988-05-31 Gas detector

Country Status (1)

Country Link
JP (1) JPH01302151A (en)

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