GB2025612A - Determination of pyrolyzable material in air - Google Patents

Determination of pyrolyzable material in air Download PDF

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Publication number
GB2025612A
GB2025612A GB7923475A GB7923475A GB2025612A GB 2025612 A GB2025612 A GB 2025612A GB 7923475 A GB7923475 A GB 7923475A GB 7923475 A GB7923475 A GB 7923475A GB 2025612 A GB2025612 A GB 2025612A
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Prior art keywords
gas
halothane
detecting
detection device
drier
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GB2025612B (en
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Draegerwerk AG and Co KGaA
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Draegerwerk AG and Co KGaA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Biophysics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

An apparatus and method are disclosed, for measuring a material, eg. halothane, in a gas, e.g. air, using a pyrolysis unit (2) for pyrolysing the material in the gas, a detection device (3) for detecting the substance(s) produced during the pyrolysis, and a drier (1) for drying the gas before the pyrolysis device (2). This prevents moisture in the gas affecting the accuracy of the detection stage. <IMAGE>

Description

SPECIFICATION Method and apparatus for detecting the presence of a pyrolyzable material, such as halothane, in a gas, such as air This invention relates to a method and apparatus for detecting the presence of a pyrolyzable material in a gas, and more particularly, but not exclusively, is concerned with detecting the presence of halothane in air. Halothane, also known as fluothane, has the chemical formula CF3.CHC IBr.
Halothane, which is used as an anaesthetic can be injurious to health. Therefore the concentration of halothane in air in working areas should not exceed values in of approximately 1 part per million {ppm).
Adherence to such a value should be checked by means which are simple and which can be used in the working areas.
According to one aspect of the present invention there is provided an apparatus for detecting the presence in a gas of a pyrolyzable material, the apparatus comprising, in series, a drier for drying gas, a pyrolysis unit for pyrolyzing said material in the gas to produce one or more detectable substance, and a detection device for indicating the presence of said material in the gas by detecting the presence of said one or more detectable substance.
According to another aspect of the present invention there is provided an apparatus for detecting the presence of halothane in a gas, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for causing any halothane present in the gas to decompose into one or more detectable substance, and a detection device for indicating the presence of halothane in the gas by detecting the presence of the one or more substance produced by the decomposition of halothane.
Preferably the detection device comprises a trans lucent housing containing a reagent which reacts and changes colour with one or more of the substance(s) produced by the decomposition of halothane in the pyrolysis unit. The reagent can react with chlorine and/or bromine.
Preferably the drier comprises a housing contain ing magnesium perchlorate.
Advantageously the apparatus includes a bellows pump connected to the detection device, which pump, in use, draws gas through the apparatus.
According to yet another aspect of the present invention there is provided a method of detecting the presence of halothane in a gas, the method comprising the steps of: (a) drying the gas; (b) heating the gas to cause pyrolysis of any halothane present; and (c) then passing the heated gas through a detec tion device which indicates the presence of halothane in the gas by detecting the pre sence of one or more substance produced by the pyrolysis of halothane.
Preferably the method is carried out in an appar atus according to the present invention.
According to yet another aspect of the present invention, there is provided a method of detecting the presence in a gas of a pyrolyzable material, the method comprising the steps of; (a) drying the gas; (b) heating the gas so as to pyrolyse of the pyrolyzable material to produce one or more detectable substance; and (c) then passing the heated gas through a detection device which detectsthe presence of the one or more detectable substance and gives an indication of the presence of said material in the gas.
The drier enables there to be produced, independently of the moisture content of the sample gas accurate values of the concentration of halothane in a gas. The apparatus can be used to measure the halothane concentration in air in working areas and should be capable of detecting concentrations of halothane of the order of 1 ppm.
For a better understanding of the present invention and to show more clearly how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing which shows an apparatus according to the present invention The drawing shows a drier 1, a pyrolysis unit 2, a detection device 3 for detecting the presence of halothane, and a gas supply device 4, in the form of a hand-operated bellows pump connected in series relative to the flow direction of air or other gas. The drier 1 comprises a glass tube filled with magnesium perchlorate. The pyrolysis unit2 is heated inside by electrical means (not shown) to a temperature of approximately 900cm. The detection device 3 comprises a translucent-housing containing a reagent which reacts and changes colour with chlorine and bromine.
In use, the gas-supply device 4 draws air, or other gas, through the apparatus. The air is dried in the drier 1 and pyrolysed in the pyrolysis unit 2 so that any halothane present decomposes. The chlorine and bromine, which result from this disassociation and which are present in an amount proportional to the amount of halothane in the air, react with the reagent in the detection device 3 to produce a zone of a different colour to the original reagent which zone extends along the device 3 from an inlet thereof. The housing of the device can be provided with a scale which indicates the concentration of halothane in the air.
1. An apparatus for detecting the presence in a gas of a pyrolyzable material, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for pyrolyzing said material in the gas to produce one or more detectable substance, and a detection device for indicating the presence of said material in the gas by detecting the presence of said one or more detectable substance.
2. An apparatus for detecting the presence of halothane in a gas, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for causing any halothane present in the gas to decoy pose into one or more detectable substance, and a detection device for indicating the presence of
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method and apparatus for detecting the presence of a pyrolyzable material, such as halothane, in a gas, such as air This invention relates to a method and apparatus for detecting the presence of a pyrolyzable material in a gas, and more particularly, but not exclusively, is concerned with detecting the presence of halothane in air. Halothane, also known as fluothane, has the chemical formula CF3.CHC IBr. Halothane, which is used as an anaesthetic can be injurious to health. Therefore the concentration of halothane in air in working areas should not exceed values in of approximately 1 part per million {ppm). Adherence to such a value should be checked by means which are simple and which can be used in the working areas. According to one aspect of the present invention there is provided an apparatus for detecting the presence in a gas of a pyrolyzable material, the apparatus comprising, in series, a drier for drying gas, a pyrolysis unit for pyrolyzing said material in the gas to produce one or more detectable substance, and a detection device for indicating the presence of said material in the gas by detecting the presence of said one or more detectable substance. According to another aspect of the present invention there is provided an apparatus for detecting the presence of halothane in a gas, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for causing any halothane present in the gas to decompose into one or more detectable substance, and a detection device for indicating the presence of halothane in the gas by detecting the presence of the one or more substance produced by the decomposition of halothane. Preferably the detection device comprises a trans lucent housing containing a reagent which reacts and changes colour with one or more of the substance(s) produced by the decomposition of halothane in the pyrolysis unit. The reagent can react with chlorine and/or bromine. Preferably the drier comprises a housing contain ing magnesium perchlorate. Advantageously the apparatus includes a bellows pump connected to the detection device, which pump, in use, draws gas through the apparatus. According to yet another aspect of the present invention there is provided a method of detecting the presence of halothane in a gas, the method comprising the steps of: (a) drying the gas; (b) heating the gas to cause pyrolysis of any halothane present; and (c) then passing the heated gas through a detec tion device which indicates the presence of halothane in the gas by detecting the pre sence of one or more substance produced by the pyrolysis of halothane. Preferably the method is carried out in an appar atus according to the present invention. According to yet another aspect of the present invention, there is provided a method of detecting the presence in a gas of a pyrolyzable material, the method comprising the steps of; (a) drying the gas; (b) heating the gas so as to pyrolyse of the pyrolyzable material to produce one or more detectable substance; and (c) then passing the heated gas through a detection device which detectsthe presence of the one or more detectable substance and gives an indication of the presence of said material in the gas. The drier enables there to be produced, independently of the moisture content of the sample gas accurate values of the concentration of halothane in a gas. The apparatus can be used to measure the halothane concentration in air in working areas and should be capable of detecting concentrations of halothane of the order of 1 ppm. For a better understanding of the present invention and to show more clearly how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing which shows an apparatus according to the present invention The drawing shows a drier 1, a pyrolysis unit 2, a detection device 3 for detecting the presence of halothane, and a gas supply device 4, in the form of a hand-operated bellows pump connected in series relative to the flow direction of air or other gas. The drier 1 comprises a glass tube filled with magnesium perchlorate. The pyrolysis unit2 is heated inside by electrical means (not shown) to a temperature of approximately 900cm. The detection device 3 comprises a translucent-housing containing a reagent which reacts and changes colour with chlorine and bromine. In use, the gas-supply device 4 draws air, or other gas, through the apparatus. The air is dried in the drier 1 and pyrolysed in the pyrolysis unit 2 so that any halothane present decomposes. The chlorine and bromine, which result from this disassociation and which are present in an amount proportional to the amount of halothane in the air, react with the reagent in the detection device 3 to produce a zone of a different colour to the original reagent which zone extends along the device 3 from an inlet thereof. The housing of the device can be provided with a scale which indicates the concentration of halothane in the air. CLAIMS
1. An apparatus for detecting the presence in a gas of a pyrolyzable material, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for pyrolyzing said material in the gas to produce one or more detectable substance, and a detection device for indicating the presence of said material in the gas by detecting the presence of said one or more detectable substance.
2. An apparatus for detecting the presence of halothane in a gas, the apparatus comprising, in series, a drier for drying the gas, a pyrolysis unit for causing any halothane present in the gas to decoy pose into one or more detectable substance, and a detection device for indicating the presence of halothane in the gas by detecting the presence of the one or more substance produced by the decomposition of halothane.
3. An apparatus as claimed in claim 2, wherein the detection device comprises a translucent housing containing a reagent which reacts and changes colour with one or more of the substance(s) produced by the decomposition of halothane in the pyrolysis unit.
4. An apparatus as claimed in claim 3, wherein the reagent reacts with chlorine and/or bromine.
5. An apparatus as claimed in claim 2,3 or4, wherein the drier comprises a housing containing magnesium perchlorate.
6. An apparatus as claimed in anyone of claims 2 to 5, which further includes a bellows pump connected to the detection device, which pump, in use, draws gas through the apparatus.
7. An apparatus substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
8. A method of detecting the presence of halothane in a gas, the method comprising the steps of: (a) drying the gas; (b) heating the gas to cause pyrolysis of any halothane present; and (c) then passing the heated gas through a detection device which indicates the presence of halothane in the gas by detecting the presence of one or more substance produced by the pyrolysis of halothane.
9. A method as claimed in claim 8, when carried out in an apparatus as claimed in any one of claims 2 to8.
10. A method according to claim 8, substantially as hereinbefore described with reference to the accompanying drawing.
11. A method of detecting the presence in a gas of a pyrolyzable material, the method comprising the steps of: (a) drying the gas; (b) heating the gas so as to pyrolysethe pyrolyzable material to produce one or more detectable substance; and (c) then passing the heated gas through a detection device which detects the presence of the one or more detectable substance and gives an indication of the presence of said material in the gas.
GB7923475A 1978-07-13 1979-07-05 Determination of pyrolyzable material in air Expired GB2025612B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782830781 DE2830781C2 (en) 1978-07-13 1978-07-13 Gas measurement method for the measurement of halothane in air using test tubes

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GB2025612A true GB2025612A (en) 1980-01-23
GB2025612B GB2025612B (en) 1982-12-01

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DE (1) DE2830781C2 (en)
FR (1) FR2431127A1 (en)
GB (1) GB2025612B (en)
NL (1) NL7903115A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119930A (en) * 1982-05-12 1983-11-23 Draegerwerk Ag Measuring temperature and concentration of a gas

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013006548B4 (en) 2013-04-16 2022-02-03 Dräger Safety AG & Co. KGaA Measuring device, reaction carrier and measuring method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2384368A (en) * 1943-04-15 1945-09-04 Baker & Co Inc Combustion of halogenated organic vapors
DE1598641A1 (en) * 1966-02-08 1972-03-02 Inst Chemii Ogolnej Continuous method for the determination of small amounts of fumes from halogen derivatives of organic compounds and hydrogen halides in air and other gases

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119930A (en) * 1982-05-12 1983-11-23 Draegerwerk Ag Measuring temperature and concentration of a gas

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Publication number Publication date
GB2025612B (en) 1982-12-01
NL7903115A (en) 1980-01-15
FR2431127B1 (en) 1981-07-17
DE2830781C2 (en) 1982-08-26
FR2431127A1 (en) 1980-02-08
DE2830781B1 (en) 1979-11-08

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