FR2236176A1 - Automatic detector for gases or vapours - utilises thermal effects on resistors in presence of gas - Google Patents

Automatic detector for gases or vapours - utilises thermal effects on resistors in presence of gas

Info

Publication number
FR2236176A1
FR2236176A1 FR7405859A FR7405859A FR2236176A1 FR 2236176 A1 FR2236176 A1 FR 2236176A1 FR 7405859 A FR7405859 A FR 7405859A FR 7405859 A FR7405859 A FR 7405859A FR 2236176 A1 FR2236176 A1 FR 2236176A1
Authority
FR
France
Prior art keywords
resistors
gas
detector
thermal effects
resistive elements
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
FR7405859A
Other languages
French (fr)
Other versions
FR2236176B1 (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.)
NOVEDADES IND HISPANO
Original Assignee
NOVEDADES IND HISPANO
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 NOVEDADES IND HISPANO filed Critical NOVEDADES IND HISPANO
Publication of FR2236176A1 publication Critical patent/FR2236176A1/en
Application granted granted Critical
Publication of FR2236176B1 publication Critical patent/FR2236176B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

A sensitive detector (1) comprises two resistive elements (2, 3) protected by a grille, allowing circulation. The resistive elements are heated by a low voltage and current from the secondary (4) of a transformer forming part of a power supply (5). Thermal effects in the presence of gas or vapour causes the resistive elements to activate a switch (6) to permit the application of power to a thyristor (7). This effectively amplifies the detector current and is controlled by a variable resistor (8) and converted by a network of resistors (9) and capacitors (10) for use as a control or alarm signal. The detector is especially for explosive gases given off by fuels, mines etc.
FR7405859A 1973-07-04 1974-02-15 Automatic detector for gases or vapours - utilises thermal effects on resistors in presence of gas Granted FR2236176A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES416578A ES416578A1 (en) 1973-07-04 1973-07-04 Improvements in an electronic device gas automatic detector. (Machine-translation by Google Translate, not legally binding)

Publications (2)

Publication Number Publication Date
FR2236176A1 true FR2236176A1 (en) 1975-01-31
FR2236176B1 FR2236176B1 (en) 1976-06-25

Family

ID=8464547

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7405859A Granted FR2236176A1 (en) 1973-07-04 1974-02-15 Automatic detector for gases or vapours - utilises thermal effects on resistors in presence of gas

Country Status (2)

Country Link
ES (1) ES416578A1 (en)
FR (1) FR2236176A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995008322A1 (en) * 1993-09-20 1995-03-30 Minnesota Mining And Manufacturing Company Method of encapsulation and microcapsules produced thereby

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545296A (en) * 1966-11-25 1968-11-08 Gen Electric Method and device for measuring the content of hydrogen or reducing gases in an atmosphere

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545296A (en) * 1966-11-25 1968-11-08 Gen Electric Method and device for measuring the content of hydrogen or reducing gases in an atmosphere

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995008322A1 (en) * 1993-09-20 1995-03-30 Minnesota Mining And Manufacturing Company Method of encapsulation and microcapsules produced thereby

Also Published As

Publication number Publication date
ES416578A1 (en) 1973-12-01
FR2236176B1 (en) 1976-06-25

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Legal Events

Date Code Title Description
ST Notification of lapse