GB1485461A - Safety systems for minimising fire and explosion hazard in the presence of combustible gases - Google Patents

Safety systems for minimising fire and explosion hazard in the presence of combustible gases

Info

Publication number
GB1485461A
GB1485461A GB3183/74A GB318374A GB1485461A GB 1485461 A GB1485461 A GB 1485461A GB 3183/74 A GB3183/74 A GB 3183/74A GB 318374 A GB318374 A GB 318374A GB 1485461 A GB1485461 A GB 1485461A
Authority
GB
United Kingdom
Prior art keywords
detection
combustible gas
electrodes
transducer
current flow
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
GB3183/74A
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.)
GREENPAR HEAT TREATMENTS Ltd
Original Assignee
GREENPAR HEAT TREATMENTS 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 GREENPAR HEAT TREATMENTS Ltd filed Critical GREENPAR HEAT TREATMENTS Ltd
Priority to GB3183/74A priority Critical patent/GB1485461A/en
Priority to ES431093A priority patent/ES431093A1/en
Priority to FR7436288A priority patent/FR2258627B1/fr
Priority to NL7414492A priority patent/NL7414492A/en
Priority to DE19742454691 priority patent/DE2454691A1/en
Publication of GB1485461A publication Critical patent/GB1485461A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/18—Detecting fluid leaks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated

Abstract

1485461 Sensing combustible gas GREENPAR HEAT TREATMENTS Ltd 25 Sept 1974 [23 Jan 1974] 03183/74 Heading G1N A safety system which operates to turn off a fuel supply and detection of a combustible gas, comprises a transducer 16 positioned for detection of a combustible gas and including two electrodes 24, 25, means, e.g. a multi-vibrator, for energizing the electrode 24 with short duration electrical pulses, means for detecting a current flow between the electrodes 24, 25 on detection of a combustible gas, and means operable from the detected current flow to close a fuel supply valve. The system may be applied to the detection of hydrogen, carbon monoxide, methane, propane, butane or alcohol vapour, and particularly to the detection of a fuel gas supplied in a pressurized container and installed in a yacht or caravan. The transducer 16 is an n-type semi-conductor comprises a sintered mass of tin dioxide whose electrical conductivity increases in the presence of a combustible gas. The electrodes 24, 25 are of platinum/iridium alloy, the electrode 24 serving also as an electric heater for the transducer 16 and energized by a multi-vibrator comprising capacitors C2, C3 and transistors TR1, TR2, TR3, the transistor TR1 regulating the charging of the capacitor C2. The power supply is regulated by a Darlington pair TR4, TR5, and a Zener diode Z1. The increased current flow between the electrodes 24, 25 on detection of a combustible gas triggers a thyristor SCR to operate a relay 1 to turn off a fuel supply valve (12) Fig. 1 (not shown) and to energize a ventilation fan (18), a warning lamp (20) and a buzzer (22). An alternative embodiment Figs. 3 and 4 (not shown) includes four transducers.
GB3183/74A 1974-01-23 1974-01-23 Safety systems for minimising fire and explosion hazard in the presence of combustible gases Expired GB1485461A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB3183/74A GB1485461A (en) 1974-01-23 1974-01-23 Safety systems for minimising fire and explosion hazard in the presence of combustible gases
ES431093A ES431093A1 (en) 1974-01-23 1974-10-17 Safety systems for minimising fire and explosion hazard in the presence of combustible gases
FR7436288A FR2258627B1 (en) 1974-01-23 1974-10-30
NL7414492A NL7414492A (en) 1974-01-23 1974-11-06 IMPROVED SAFETY SYSTEM TO REDUCE FIRE AND EXPLOSION RISK IN THE PRESENCE OF FLAMMABLE GASES.
DE19742454691 DE2454691A1 (en) 1974-01-23 1974-11-19 SAFETY SYSTEM FOR DETECTING LOW CONCENTRATIONS OF FLAMMABLE GASES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3183/74A GB1485461A (en) 1974-01-23 1974-01-23 Safety systems for minimising fire and explosion hazard in the presence of combustible gases

Publications (1)

Publication Number Publication Date
GB1485461A true GB1485461A (en) 1977-09-14

Family

ID=9753504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3183/74A Expired GB1485461A (en) 1974-01-23 1974-01-23 Safety systems for minimising fire and explosion hazard in the presence of combustible gases

Country Status (5)

Country Link
DE (1) DE2454691A1 (en)
ES (1) ES431093A1 (en)
FR (1) FR2258627B1 (en)
GB (1) GB1485461A (en)
NL (1) NL7414492A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275155A2 (en) * 1987-01-16 1988-07-20 Schlumberger Industries Limited Fluid leak detector
WO2012052290A1 (en) * 2010-10-22 2012-04-26 International Business Machines Corporation Detecting and automatically responding to airborne hydrocarbon gas
CN110013623A (en) * 2019-02-21 2019-07-16 天津市时代消防科技有限公司 A kind of fire-extinguishing device for kitchen equipment intelligent control method and system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907049A1 (en) * 1989-03-04 1990-09-13 Bayerische Motoren Werke Ag VEHICLE WITH A SECURITY SYSTEM
DE4334954A1 (en) * 1993-10-14 1995-06-29 Theo Bender Apparatus for monitoring gas leaks in domestic hot water system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275155A2 (en) * 1987-01-16 1988-07-20 Schlumberger Industries Limited Fluid leak detector
EP0275155A3 (en) * 1987-01-16 1989-03-15 Thorn Emi Flow Measurement Limited Fluid leak detector
US4847599A (en) * 1987-01-16 1989-07-11 Thorn Emi Flow Measurement Limited Fluid leak detector
WO2012052290A1 (en) * 2010-10-22 2012-04-26 International Business Machines Corporation Detecting and automatically responding to airborne hydrocarbon gas
US8439072B2 (en) 2010-10-22 2013-05-14 International Business Machines Corporation Hydrocarbon gas delivery system
US8511345B2 (en) 2010-10-22 2013-08-20 International Business Machines Corporation Detecting and automatically responding to airborne hydrocarbon gas
JP2014501888A (en) * 2010-10-22 2014-01-23 インターナショナル・ビジネス・マシーンズ・コーポレーション System and method for controllably delivering hydrocarbon gas to a hydrocarbon gas fuel system
CN110013623A (en) * 2019-02-21 2019-07-16 天津市时代消防科技有限公司 A kind of fire-extinguishing device for kitchen equipment intelligent control method and system

Also Published As

Publication number Publication date
DE2454691A1 (en) 1975-07-24
NL7414492A (en) 1975-07-25
FR2258627B1 (en) 1977-03-25
ES431093A1 (en) 1976-10-16
FR2258627A1 (en) 1975-08-18

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414A Case decided by the comptroller ** specification amended (sect. 14/1949)
PS Patent sealed
SP Amendment (slips) printed
PCNP Patent ceased through non-payment of renewal fee