JPS643799A - Gas leak alarm - Google Patents

Gas leak alarm

Info

Publication number
JPS643799A
JPS643799A JP15903187A JP15903187A JPS643799A JP S643799 A JPS643799 A JP S643799A JP 15903187 A JP15903187 A JP 15903187A JP 15903187 A JP15903187 A JP 15903187A JP S643799 A JPS643799 A JP S643799A
Authority
JP
Japan
Prior art keywords
circuit
gas
varying speed
alarm
signal
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
JP15903187A
Other languages
Japanese (ja)
Inventor
Kenji Ishikura
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP15903187A priority Critical patent/JPS643799A/en
Publication of JPS643799A publication Critical patent/JPS643799A/en
Pending legal-status Critical Current

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  • Emergency Alarm Devices (AREA)

Abstract

PURPOSE:To shorten a delay time at the time of spraying an inspecting gas and to facilitate inspection, by providing a gas varying speed monitoring circuit which monitors the varying speed of gas density and shortens the delay time of a delay circuit when varying speed is high. CONSTITUTION:A gas detection circuit 1, when detecting the gas leaked in the air, sends its output to a gas density decision circuit 2. The circuit 2 decides the gas density from input, and sends an operating signal to the delay circuit 3 when deciding the excess of the gas density over alarm density. The circuit 3 delays the output of the circuit 2 delaying by a prescribed time so as not to issue an alarm by a noise, etc., to an alarm circuit 4 as an alarm signal. The circuit 4 issues a gas leak alarm by receiving the signal. The gas varying speed monitoring circuit 6 receives the signal from the circuits 1 and 2, and defects the varying speed of the gas density, and shortens the delay time by sending the signal to the circuit 3 when the varying speed of the gas density is high. In such a way, it is possible to shorten an inspection time by shortening the delay time by spraying the inspecting gas.
JP15903187A 1987-06-26 1987-06-26 Gas leak alarm Pending JPS643799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15903187A JPS643799A (en) 1987-06-26 1987-06-26 Gas leak alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15903187A JPS643799A (en) 1987-06-26 1987-06-26 Gas leak alarm

Publications (1)

Publication Number Publication Date
JPS643799A true JPS643799A (en) 1989-01-09

Family

ID=15684745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15903187A Pending JPS643799A (en) 1987-06-26 1987-06-26 Gas leak alarm

Country Status (1)

Country Link
JP (1) JPS643799A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57795A (en) * 1980-06-04 1982-01-05 Hitachi Ltd Method of detecting and warning gas leakage
JPS6240693B2 (en) * 1985-09-24 1987-08-29 Canon Kk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57795A (en) * 1980-06-04 1982-01-05 Hitachi Ltd Method of detecting and warning gas leakage
JPS6240693B2 (en) * 1985-09-24 1987-08-29 Canon Kk

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