GB1489072A - Intrinsically safe systems - Google Patents

Intrinsically safe systems

Info

Publication number
GB1489072A
GB1489072A GB752274A GB752274A GB1489072A GB 1489072 A GB1489072 A GB 1489072A GB 752274 A GB752274 A GB 752274A GB 752274 A GB752274 A GB 752274A GB 1489072 A GB1489072 A GB 1489072A
Authority
GB
United Kingdom
Prior art keywords
light emitting
emitting diode
board
circuits
block
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.)
Expired
Application number
GB752274A
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.)
Rockwell Automation Ltd
Original Assignee
Industrial Control Services PLC
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 Industrial Control Services PLC filed Critical Industrial Control Services PLC
Priority to GB752274A priority Critical patent/GB1489072A/en
Publication of GB1489072A publication Critical patent/GB1489072A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F9/00—Devices preventing sparking of machines or apparatus
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
    • H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Signal Processing (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

1489072 Optical isolator INDUSTRIAL CONTROL SERVICES Ltd 17 Feb 1975 [19 Feb 1974] 7522/74 Heading G1A [Also in Division H2] In an optical isolator arrangement signals from one electronic circuit on a board 20 are transmitted to another electronic circuit on a board 10 by way of a light emitting diode P.E.D. at one end of a bore 32 in a metal block 30 and a photo-transistor PT at the other end. The brass block may be connected to the earths of the two different circuits. The bore may contain a fibre optics cable. The circuits 10, 20 can be mounted on the same cicuit board with the block 30 positioned accordingly. The circuit containing the light emitting diode may also contain a temperature transducer whose contacts are closed so long as a prescribed safe temperature is not exceeded. If the safe temperature is exceeded the contacts are opened to turn off the light emitting diode. Examples, Figs. 1, 3 and 4 (not shown) of several circuits are disclosed.
GB752274A 1975-02-17 1975-02-17 Intrinsically safe systems Expired GB1489072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB752274A GB1489072A (en) 1975-02-17 1975-02-17 Intrinsically safe systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB752274A GB1489072A (en) 1975-02-17 1975-02-17 Intrinsically safe systems

Publications (1)

Publication Number Publication Date
GB1489072A true GB1489072A (en) 1977-10-19

Family

ID=9834747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB752274A Expired GB1489072A (en) 1975-02-17 1975-02-17 Intrinsically safe systems

Country Status (1)

Country Link
GB (1) GB1489072A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356145A1 (en) * 1976-06-25 1978-01-20 Siemens Ag MEASURING DEVICE FOR ASSEMBLIES OF SWITCHING OR SWITCHING DEVICES SEALED SO AS TO WITHSTAND PRESSURE
FR2532126A1 (en) * 1982-08-14 1984-02-24 Dresser Europe Sa ENERGY SUPPLY SYSTEM AND MACHINE COMPRISING SUCH A SYSTEM
GB2150382A (en) * 1983-11-29 1985-06-26 Thorn Emi Ferguson Optical signalling between elements on a circuit board
US6404609B1 (en) * 2000-03-31 2002-06-11 Micro Motion, Inc. Circuit that reduces the numbers of components needed to transmit data from intrinsically safe to non-intrinsically safe circuits using opto-couplers
WO2013075397A1 (en) * 2011-11-25 2013-05-30 欧姆龙株式会社 Photoelectric sensor
DE112007001098B4 (en) 2006-05-05 2024-07-04 Pepperl + Fuchs Gmbh Ethernet data signal isolation device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356145A1 (en) * 1976-06-25 1978-01-20 Siemens Ag MEASURING DEVICE FOR ASSEMBLIES OF SWITCHING OR SWITCHING DEVICES SEALED SO AS TO WITHSTAND PRESSURE
FR2532126A1 (en) * 1982-08-14 1984-02-24 Dresser Europe Sa ENERGY SUPPLY SYSTEM AND MACHINE COMPRISING SUCH A SYSTEM
GB2150382A (en) * 1983-11-29 1985-06-26 Thorn Emi Ferguson Optical signalling between elements on a circuit board
US6404609B1 (en) * 2000-03-31 2002-06-11 Micro Motion, Inc. Circuit that reduces the numbers of components needed to transmit data from intrinsically safe to non-intrinsically safe circuits using opto-couplers
DE112007001098B4 (en) 2006-05-05 2024-07-04 Pepperl + Fuchs Gmbh Ethernet data signal isolation device
WO2013075397A1 (en) * 2011-11-25 2013-05-30 欧姆龙株式会社 Photoelectric sensor

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee