US2534796A - Apparatus for indicating the presence of inflammable vapors or gas - Google Patents

Apparatus for indicating the presence of inflammable vapors or gas Download PDF

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Publication number
US2534796A
US2534796A US743260A US74326047A US2534796A US 2534796 A US2534796 A US 2534796A US 743260 A US743260 A US 743260A US 74326047 A US74326047 A US 74326047A US 2534796 A US2534796 A US 2534796A
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United States
Prior art keywords
gas
porous vessel
vessel
filament
lamp
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Expired - Lifetime
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US743260A
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English (en)
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Ringrose Henry Thomas
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Individual
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
    • G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
    • G01N7/12—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference the diffusion being followed by combustion or catalytic oxidation

Definitions

  • Ihis invention relates to apparatus, more particularly for use in mines, for indicating the presence of inflammable vapours or gases, and of the type wherein a vacuum proportional to the amount of inflammable vapour or gas in the atmosphere surrounding a porous vessel, which is capable of maintaining a gas pressure r vacuum for a substantial time, is created therein by the combustion of the inflammable vapours or gases, which diffuse or are aspirated into said vessel.
  • Such apparatus as has hitherto been designed has been intended primarily for use by the miner, and has usually been incorporated in a miners electric lamp, the vacuum produced by combustion of vapours or gases in the porous vessel,
  • the object of the present invention is the pro- 7 vision of a new or improved apparatus for use as an accurate measuring instrument, say by inspectors or other mine ofiicials, when making gas tests in the workings.
  • the vacuum created by the combustion of vapours or gases .
  • the porous vessel is utilised to operate a manometer having associated therewith a graduated scale or mechanical vacuum gauge, and the apparatus is characterised in that the porous vessel containing the filament has a combustion space of the smallest capacity necessary for containing the filament holder and air circulating ducts in a depending boss of the closure for the porous vessel, and
  • the porous vessel is surrounded or en-- closed by a scalable chamber having controlled inlets through which atmospheric air must pass prior to dififusi-ng to the interior of the porous vessel.
  • the bulb efiect of the porous vessel is reduced to a minimum or negligible factor and the apparatus rendered immune from the efiect of external pressure and temperature variations, so that accurate readings of the vacuum or proportion or percentage of inflammable vapours r gases in the atmosphere can be obtained.
  • the chamber may be provided with a wick, activated carbon or absorbent packing saturated in water to produce and maintain a constant humidity or moisture laden atmosphere in said chamber. This is desirable to produce an indicating instrument of precision of the type described.
  • the scale associated with the manometer is preferably adjustable so that its zero can be set to register with the liquid column upon making a test in .fresh air, say before going into the mine, so that direct accurate readings will be obtained when making subsequent tests in atmospheres containin methane or other inflammable gases or vapours, and said scale is preferably illuminated say by means of an electric lamp bulb connected in series with the filament in the porous vessel.
  • the series connected lamp bulb is of low capacity and is shunted by a resistance having a negligible temperature co-efiicient to take the initial current surge or loading.
  • the gas testing apparatus may be incorporated in an inspection hand lamp, a switching device being provided for alternatively connecting the inspection lamp bulb, and the combustion filament with its associated scale illuminating bulb may .be adapted to serve in lieu of the inspection lamp bulb in the event of the latter being broken or fusing. Further, should the filament in the porous vessel be broken or fuse, this will be indicated by failure of the scale illuminating bulb to light when switching .over to make a gas test.
  • Figure 1 is an elevation of a combined gas testing apparatus and inspection lamp with the battery casing partly broken away.
  • Figure 2 is a plan of Figure 1 with the top cover or cap removed.
  • Figure 3 is a part sectional elevation of Figure 1.
  • Figure 4 is an inverted plan view of Figure 3, but with the contact plate removed.
  • Figure 5 is a plan of the contact plate.
  • Figure 6 is a part sectional elevation showing the contact plate in position in the porous pot.
  • Figure 7 is an inverted plan of Figure 5.
  • Figure 8 is a diagrammatic representation showing the electrical circuit of the combined gas testing apparatus and inspection lamp.
  • the battery container I is closed by a lamp ring 2 carrying the porous vessel 3 between its upper face and a clamping plate 4 which constitutes a top closure for the porous vessel 3 and is provided centrally with a depending boss 5 which almost completely fills the interior space of the cylindrical porous vessel 3.
  • a lamp ring 2 carrying the porous vessel 3 between its upper face and a clamping plate 4 which constitutes a top closure for the porous vessel 3 and is provided centrally with a depending boss 5 which almost completely fills the interior space of the cylindrical porous vessel 3.
  • an insulating contact plate 6 having appropriate battery terminal contacts I, 33 and 34 on its underside and a central filament mounting boss 8 on its upper side, said mounting boss 8 with its filament 9 projecting into the lower part of the porous vessel 3 and being encircled by a sealing washer ID to afford a tight joint.
  • the underside of the boss 5 on the top clamping plate 4 is formed with a diametrical recess or cavity II to accommodate the filament 9 and radial ducts or channels I2 giving access to said cavity II for gas which difiuses into the porous vessel, and said boss 5 is bored through centrally at 13 from said cavity or recess to communicate with one limb of the manometer M or other vacuum gauge which is mounted on the upper side of said top clamping plate 4, which also carries the holder I5 for the scale illuminating bulb IS, the shunting resistance l1 and a contact I8 for the inspection lamp bulb [9 which is mounted in a top cover or cap 29 adapted to I completely enclose the parts on the top clamping plate 4.
  • afforded between the porous vessel 3 and the lamp ring 2 affords an admission chamber which is closed by a removable cover 22 and provided with gauze-protected air admission openings 23 through its outer wall, whilst a hit and miss apertured damper or valve ring 24 encircles said outer wall and can be rotated by means of the knob 25 to seal said chamber or admit air at will.
  • contains a wick, activated carbon or other absorbent material 26 to maintain a constant humidity within said chamber 2
  • the top cover or cap 20 is fitted with a carrying handle 21 and has a laterally disposed housing 28 for the inspection lamp bulb l9, associated refiector 29 and lamp glass 30, whilst opposite a Window 31 in the wall of said cover or cap 20 and within the latter is mounted a scale 32 which is adjustable and lies alongside the registering limb 39 of the manometer l4 and is illuminated by the lamp IS on the top clamping plate when the testing filament is switched on.
  • the switching over from inspection lamp to test filament and scale lamp is effected by rotation of the battery container I relatively to the contact plate 9 to connect either of contacts 33, 34 with the battery.
  • the inspection lamp l9 may be of the double filament variety and in order to change the filaments, the bulb l9 and holder 35 are mounted in a rotatable member 36 which has two contacts 3! adapted to be connected one at a time with the contact l8, and a knob 38 is provided on the outside of the lamp housing 28 for the purpose of rotating the member 36.
  • the device In operation, the device is taken into a suspected poisonous gas area and the gases diffuse into the porous vessel, the filament is heated and any combustible gases in the porous vessel are ignited.
  • the vacuum is created in the porous vessel proportional to the amount of inflammable vapour or gas ignited within the porous vessel. The vacuum operates the manometer which gives a reading in accordance with the degree of vacuum.
  • an apparatus for indicating the presence of inflammable vapors or gases including a battery container provided with anopen upper end, a

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (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)
  • Sampling And Sample Adjustment (AREA)
US743260A 1941-05-31 1947-04-23 Apparatus for indicating the presence of inflammable vapors or gas Expired - Lifetime US2534796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6992/41A GB547452A (en) 1941-05-31 1941-05-31 Improvements in or relating to apparatus for indicating the presence of inflammable vapours or gas

Publications (1)

Publication Number Publication Date
US2534796A true US2534796A (en) 1950-12-19

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US743260A Expired - Lifetime US2534796A (en) 1941-05-31 1947-04-23 Apparatus for indicating the presence of inflammable vapors or gas

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US (1) US2534796A (en:Method)
BE (1) BE472732A (en:Method)
FR (1) FR945506A (en:Method)
GB (1) GB547452A (en:Method)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1174370A (en) * 1915-04-12 1916-03-07 Henry Roberts Webster Gas-detecting apparatus.
US1652448A (en) * 1923-03-26 1927-12-13 Martienssen Oscar Fire-damp indicator
US1721977A (en) * 1926-10-23 1929-07-23 Sewerin Hermann Gas indicator
GB357017A (en) * 1929-11-29 1931-09-17 Jules Gaston Daloz Improvements in and relating to eudiometric apparatus especially to those for measuring firedamp
US2109355A (en) * 1933-08-29 1938-02-22 Clarence H Lank Liquid level gauge
GB484194A (en) * 1936-08-01 1938-05-02 Henry Thomas Ringrose Improvements in or relating to apparatus for indicating the presence of inflammable vapours or gases

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1174370A (en) * 1915-04-12 1916-03-07 Henry Roberts Webster Gas-detecting apparatus.
US1652448A (en) * 1923-03-26 1927-12-13 Martienssen Oscar Fire-damp indicator
US1721977A (en) * 1926-10-23 1929-07-23 Sewerin Hermann Gas indicator
GB357017A (en) * 1929-11-29 1931-09-17 Jules Gaston Daloz Improvements in and relating to eudiometric apparatus especially to those for measuring firedamp
US2109355A (en) * 1933-08-29 1938-02-22 Clarence H Lank Liquid level gauge
GB484194A (en) * 1936-08-01 1938-05-02 Henry Thomas Ringrose Improvements in or relating to apparatus for indicating the presence of inflammable vapours or gases

Also Published As

Publication number Publication date
BE472732A (en:Method)
FR945506A (fr) 1949-05-06
GB547452A (en) 1942-08-27

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