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GB1509196A - Apparatus for sensing an electrical property of a heated medium - Google Patents

Apparatus for sensing an electrical property of a heated medium

Info

Publication number
GB1509196A
GB1509196A GB2267374A GB2267374A GB1509196A GB 1509196 A GB1509196 A GB 1509196A GB 2267374 A GB2267374 A GB 2267374A GB 2267374 A GB2267374 A GB 2267374A GB 1509196 A GB1509196 A GB 1509196A
Authority
GB
United Kingdom
Prior art keywords
flame
signal
loudspeaker
concentration
amplifier
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
GB2267374A
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.)
RES ENGS Ltd
Original Assignee
RES ENGS 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 RES ENGS Ltd filed Critical RES ENGS Ltd
Priority to GB2267374A priority Critical patent/GB1509196A/en
Publication of GB1509196A publication Critical patent/GB1509196A/en
Expired 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
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Control Of Combustion (AREA)

Abstract

1509196 Flame ionization detector RESEARCH ENGS Ltd 30 April 1975 [21 May 1974] 22673/74 Heading G1N A flame ionization detector has a flame failure sensing thermocouple 24 producing an audible alarm signal from loudspeaker 22. Flame extinction causes the output of differential amplifier to change polarity whereby transistor 41 is switched off and oscillator 42 is switched on to energize the loudspeaker via voltage-frequency converter 21. Re-ignition of the flame provides a path through transistor switch 41 for the signal from electrode 12 which passes to amplifier 14 and is indicative of the concentration of hydrocarbon concentration in air sampled by the detector. This signal is applied through the converter to the loudspeaker to provide an audible signal of pitch variable with concentration of hydrocarbon, and is also applied to a meter 16 via a logarithmic amplifier.
GB2267374A 1975-04-30 1975-04-30 Apparatus for sensing an electrical property of a heated medium Expired GB1509196A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2267374A GB1509196A (en) 1975-04-30 1975-04-30 Apparatus for sensing an electrical property of a heated medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2267374A GB1509196A (en) 1975-04-30 1975-04-30 Apparatus for sensing an electrical property of a heated medium

Publications (1)

Publication Number Publication Date
GB1509196A true GB1509196A (en) 1978-05-04

Family

ID=10183258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2267374A Expired GB1509196A (en) 1975-04-30 1975-04-30 Apparatus for sensing an electrical property of a heated medium

Country Status (1)

Country Link
GB (1) GB1509196A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127553A (en) * 1982-08-25 1984-04-11 Core Lab Inc Apparatus for processing the output signal of a gas chromatograph

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127553A (en) * 1982-08-25 1984-04-11 Core Lab Inc Apparatus for processing the output signal of a gas chromatograph

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Legal Events

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