GB8717304D0 - Fail safe circuit - Google Patents

Fail safe circuit

Info

Publication number
GB8717304D0
GB8717304D0 GB878717304A GB8717304A GB8717304D0 GB 8717304 D0 GB8717304 D0 GB 8717304D0 GB 878717304 A GB878717304 A GB 878717304A GB 8717304 A GB8717304 A GB 8717304A GB 8717304 D0 GB8717304 D0 GB 8717304D0
Authority
GB
United Kingdom
Prior art keywords
fail safe
safe circuit
circuit
fail
safe
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.)
Withdrawn
Application number
GB878717304A
Other versions
GB2207307A (en
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.)
MSA Britain Ltd
Original Assignee
MSA Britain 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 MSA Britain Ltd filed Critical MSA Britain Ltd
Priority to GB08717304A priority Critical patent/GB2207307A/en
Publication of GB8717304D0 publication Critical patent/GB8717304D0/en
Publication of GB2207307A publication Critical patent/GB2207307A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9502—Measures for increasing reliability
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/16—Security signalling or alarm systems, e.g. redundant systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Safety Devices In Control Systems (AREA)
GB08717304A 1987-07-22 1987-07-22 Fail-safe monitoring circuit Withdrawn GB2207307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08717304A GB2207307A (en) 1987-07-22 1987-07-22 Fail-safe monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08717304A GB2207307A (en) 1987-07-22 1987-07-22 Fail-safe monitoring circuit

Publications (2)

Publication Number Publication Date
GB8717304D0 true GB8717304D0 (en) 1987-08-26
GB2207307A GB2207307A (en) 1989-01-25

Family

ID=10621089

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08717304A Withdrawn GB2207307A (en) 1987-07-22 1987-07-22 Fail-safe monitoring circuit

Country Status (1)

Country Link
GB (1) GB2207307A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217125B (en) * 1988-04-08 1992-02-05 Digital Audio Limited An alarm system
DE4210216C3 (en) * 1992-03-28 1997-04-03 Dungs Karl Gmbh & Co Monitoring circuit for computer controlled safety devices
GB9307733D0 (en) * 1993-04-14 1993-06-02 Msa Britain Ltd Respiratory protective device
US7424641B2 (en) 2005-04-06 2008-09-09 Delphi Technologies, Inc. Control system and method for validating operation of the control system
CN105824261A (en) * 2016-05-04 2016-08-03 徐州五洋科技股份有限公司 Intrinsically safe circuit for coal mine electric control switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1331432A (en) * 1970-10-22 1973-09-26 British Aircraft Corp Ltd Monitoring circuits for pulse generators'
JPS60159607A (en) * 1984-01-31 1985-08-21 Toshiba Corp Thickness detector

Also Published As

Publication number Publication date
GB2207307A (en) 1989-01-25

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)