JPS5492197A - Anomaly detection alarm unit - Google Patents

Anomaly detection alarm unit

Info

Publication number
JPS5492197A
JPS5492197A JP15946077A JP15946077A JPS5492197A JP S5492197 A JPS5492197 A JP S5492197A JP 15946077 A JP15946077 A JP 15946077A JP 15946077 A JP15946077 A JP 15946077A JP S5492197 A JPS5492197 A JP S5492197A
Authority
JP
Japan
Prior art keywords
gas
output signal
bridge circuit
alarm unit
divided
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
JP15946077A
Other languages
Japanese (ja)
Other versions
JPS6118240B2 (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 JP15946077A priority Critical patent/JPS5492197A/en
Priority to US05/968,469 priority patent/US4228429A/en
Priority to DE2856742A priority patent/DE2856742C2/en
Publication of JPS5492197A publication Critical patent/JPS5492197A/en
Publication of JPS6118240B2 publication Critical patent/JPS6118240B2/ja
Granted 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 reversed by 180°. The output signal from this bridge circuit 4 is applied to the other input terminal of operational amplifier 5, and this input signal is divided by resistances R1 and R2 and increase and decrease with the reference voltage as a center. The output signal voltage of this amplifier 5 is divided by resistances R3 and R4 and these divided voltages are impressed upon the control electrode of thyristor 6. Thyristor 6 becomes conductive only at anomaly and drives alarm unit 7.
COPYRIGHT: (C)1979,JPO&Japio
JP15946077A 1977-12-29 1977-12-29 Anomaly detection alarm unit Granted JPS5492197A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP15946077A JPS5492197A (en) 1977-12-29 1977-12-29 Anomaly detection alarm unit
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
JP15946077A JPS5492197A (en) 1977-12-29 1977-12-29 Anomaly detection alarm unit

Publications (2)

Publication Number Publication Date
JPS5492197A true JPS5492197A (en) 1979-07-21
JPS6118240B2 JPS6118240B2 (en) 1986-05-12

Family

ID=15694238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15946077A Granted JPS5492197A (en) 1977-12-29 1977-12-29 Anomaly detection alarm unit

Country Status (1)

Country Link
JP (1) JPS5492197A (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
JPS59138995U (en) * 1983-03-07 1984-09-17 松下電器産業株式会社 Gas leak alarm control device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223560A (en) * 1975-08-14 1977-02-22 Shiyuraubenkonbinaato Veb Method of manufacturing high strencth cold formed parts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223560A (en) * 1975-08-14 1977-02-22 Shiyuraubenkonbinaato Veb Method of manufacturing high strencth cold formed parts

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
JPS59138995U (en) * 1983-03-07 1984-09-17 松下電器産業株式会社 Gas leak alarm control device

Also Published As

Publication number Publication date
JPS6118240B2 (en) 1986-05-12

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