JPS5492199A - Anomaly detection alarm unit - Google Patents

Anomaly detection alarm unit

Info

Publication number
JPS5492199A
JPS5492199A JP15946277A JP15946277A JPS5492199A JP S5492199 A JPS5492199 A JP S5492199A JP 15946277 A JP15946277 A JP 15946277A JP 15946277 A JP15946277 A JP 15946277A JP S5492199 A JPS5492199 A JP S5492199A
Authority
JP
Japan
Prior art keywords
amplifier
gas
bridge circuit
alarm unit
operational amplifier
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
JP15946277A
Other languages
Japanese (ja)
Other versions
JPS6059639B2 (en
Inventor
Yoshiyuki Tsuchiya
Ichiro Yoshihara
Kazuhito Saito
Takeshi Abe
Kiyoshi Sone
Kiyoshi Abe
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15946277A priority Critical patent/JPS6059639B2/en
Priority to US05/968,469 priority patent/US4228429A/en
Priority to DE2856742A priority patent/DE2856742C2/en
Publication of JPS5492199A publication Critical patent/JPS5492199A/en
Publication of JPS6059639B2 publication Critical patent/JPS6059639B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)

Abstract

PURPOSE: To use, as an AC amplifier, the operational amplifier which has been installed on the anomaly detection alarm unit that senses anomalies such as gas leaks and sends alarm, so that off-set adjustment will become unnecessary, erroneous operation will be eliminated and labor will be saved.
CONSTITUTION: Gas detector D, whose electric resistance changes when it touches inflammable gases such as a city gas, is provided on one side of AC bridge circuit 4. In the normal state where there is no inflammable gas in the air, this bridge circuit is imbalanced. When inflammable gas concentration in the air reaches the alarm concentration, it becomes balanced, its output signal voltage comes to be practically 0, and its phase is recersed by 180°. The output signal from this bridge circuit 4 is applied to the other input terminal of operational amplifier 5. The output of this amplifier 5 is divided by resistances R3 and R4 and divided voltages are impressed upon thyristor 6, which is conducted only at the time of anomaly and drives alarm unit 7. For the power source of the said amplifier, the output of all wave rectifier 3 which has been smoothened by capacitor C5 is used. For this reason, operational amplifier 5 will not become inoperative.
COPYRIGHT: (C)1979,JPO&Japio
JP15946277A 1977-12-29 1977-12-29 Abnormality detection alarm device Expired JPS6059639B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP15946277A JPS6059639B2 (en) 1977-12-29 1977-12-29 Abnormality detection alarm device
US05/968,469 US4228429A (en) 1977-12-29 1978-12-11 Alarm system having phase-sensitive bridge circuit
DE2856742A DE2856742C2 (en) 1977-12-29 1978-12-29 Alarm system with an AC power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15946277A JPS6059639B2 (en) 1977-12-29 1977-12-29 Abnormality detection alarm device

Publications (2)

Publication Number Publication Date
JPS5492199A true JPS5492199A (en) 1979-07-21
JPS6059639B2 JPS6059639B2 (en) 1985-12-26

Family

ID=15694283

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15946277A Expired JPS6059639B2 (en) 1977-12-29 1977-12-29 Abnormality detection alarm device

Country Status (1)

Country Link
JP (1) JPS6059639B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113192U (en) * 1982-01-27 1983-08-02 リコーエレメックス株式会社 Detection output circuit for gas leak alarm
JPH05238629A (en) * 1991-11-08 1993-09-17 Ricoh Co Ltd Sorter provided with stapling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113192U (en) * 1982-01-27 1983-08-02 リコーエレメックス株式会社 Detection output circuit for gas leak alarm
JPH05238629A (en) * 1991-11-08 1993-09-17 Ricoh Co Ltd Sorter provided with stapling device

Also Published As

Publication number Publication date
JPS6059639B2 (en) 1985-12-26

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