US1861989A - Gas indicating apparatus - Google Patents

Gas indicating apparatus Download PDF

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Publication number
US1861989A
US1861989A US271745A US27174528A US1861989A US 1861989 A US1861989 A US 1861989A US 271745 A US271745 A US 271745A US 27174528 A US27174528 A US 27174528A US 1861989 A US1861989 A US 1861989A
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US
United States
Prior art keywords
porous
vessel
tube
mercury
gas
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 - Lifetime
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US271745A
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English (en)
Inventor
Trebitsch Bruno
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Individual
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Individual
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Publication date
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Priority claimed from GB2171128A external-priority patent/GB313355A/en
Application granted granted Critical
Publication of US1861989A publication Critical patent/US1861989A/en
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Expired - Lifetime legal-status Critical Current

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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

Definitions

  • My invention relates to an apparatus, which indicates the presence of combustible, explosive or poisonous gases in the air of a room where the apparatus is located and which is operated under the influence of gases of greater as well as of smaller density than the surrounding air.
  • the object of the present invention is to perform the indication of gases admiXed to the air by a reliable apparatus avoiding the drawbacks connected with apparatus of known types and the operation of which is based on the difference in the velocity of diffusion of air and gas and which operates independently of the density of the gas.
  • the apparatus according to this invention differs from the known types in that the diffusion takes place subsequently from the outer air into a porous vessel enclosing another porous vessel and then from the intermediate space between these two vessels into the inner porous vessel.
  • a pressure rise is prevented temporarily within the vessels, until the gases within the same are of the same density, i. e. of the same quality as the surrounding atmosphere.
  • the pressure rise within the inner vesf' sel will be much greater than it would be where a single porous vessel is used.
  • the pressure rise within the inner vessel serves to operate an electrically or mechanically actuated signalling device in a well known manner.
  • Fig. 1 is an elevation of the apparatus partly in a longitudinal section
  • Fig. 2 is a section of the casing with the apparatus in a side view.
  • a vessel is tted with a diaphragm 1, preferably a diaphragm of a suitable size and shape e. g. a cylinder of porous material, such as clay or the like, which is mounted by means of surrounding straps 2, 3 on a base plate 4 preferably made of wood, by means of two interposed pieces 5 of a soft elastic material, e. g. cork.
  • the straps are tightened by means of screws and nuts 7, 8.
  • the diaphragm in the shape of a cylindrical vessel'is closed on all sides and contains another porous vessel or diaphragm 25, having one circular base in common with the former, and at this circular base a tube 9, preferably made of glass, is inserted and secured, so that no leakage is permitted at the joint.
  • the part of the Wall adjacent to the tube is of a tight material and made impermeable by varnishing.
  • the glass tube is partly filled with mercury 10, and two contact pieces or wires 11, 12, preferably made of platinum, are cast in the wall of the tube and are connected by wires 13, 14 with the terminals 15, 16 at the casing 17, the bottom of which remains open, or at the base plate el. Adjusting screws 18 and 19 are arranged at the latter to adjust its position in such a way that the level of a quantity of current conducting liquid, e. g. mercury, within the tube is at a small distance from the upper contact piece 11.
  • a quantity of current conducting liquid e. g. mercury
  • rlhe terminals 15, 18 are connected to a source of electromotive force, e. g. a battery 20 and to avoid sparking effect when the current is slowly opened or closed, the conducting liquid within the tube is covered with an insulating liquid, e. g. oil, petrol or the like, to prevent the conducting liquid at its surface from being oxydated.
  • a bell 21, or an indicating lamp, is connected in series with the battery.
  • the atmosphere of the room, where the apparatus is located is identical with that of the gas enclosed within the diaphragm, the pressure of the latter is identical with that of the atmosphere, and the conducting liquid remains at rest in the tube 9. If, however, even a small quantity of gas, which i-s not present within the diaphragm is admiXed ⁇ to the atmosphere of the room, the gas is diffusing into the diaphragm and the internal pressure is increased, whereby the conducting liquid is displaced within the tube and the circuit closed between the contacts 11 and 12.
  • a signalling device may also be connected in a circuit so that the circuit closed by the mercury acts upon a relay, which causes the bell to ring continuously even after the gas has ceased to influence the diaphragm and the mercury has returned to its previous position and the current in the tube has been interrupted.
  • An apparatus for indicating the presence of combustible, explosive or poisonous gases comprising a porous vessel having double porous Walls, and a pressure indicating means connected With lsaid vessel so as to indicate the pressure Within the inner porous Wall.
  • An apparatus for indicating the presence of combustible, explosive or poisonous gases comprising a porous vessel having double porous Walls, and a U-shaped tube partly filled with mercury and constituting a pressure indicating means operatively connected with said vessel, one terminal of said tube being permanently covered by the mercury and the other terminal located With its end at a small distance above the level of the mercury.
  • An apparatus for indicating the presence of combustible, explosive or poisonous gases comprising a porous vessel having double porous Walls, a U-shaped tube partly filled with mercury and constituting a pressure indicating means operatively connected with said vessel, a terminal located above the level of the mercury, and means for adjusting the apparatus so as to bring the mercury level as near as possible to said terminal Without touching the same.
  • An apparatus for indicating the presence of combustible, explosive or poisonous gases comprising a porous vessel having double porous Walls, and a pressure indicating means adapted to indicate the pressure within the inn-er porous Wall, both porous walls having a common impermeable base plate thereby preventing direct communication from the inner porous Wall to the outer In testimony whereof I have hereunto set my hand.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Measuring Fluid Pressure (AREA)
US271745A 1928-01-19 1928-04-21 Gas indicating apparatus Expired - Lifetime US1861989A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1861989X 1928-01-19
GB2171128A GB313355A (en) 1928-07-26 1928-07-26 Apparatus for indicating the presence of gases

Publications (1)

Publication Number Publication Date
US1861989A true US1861989A (en) 1932-06-07

Family

ID=25608553

Family Applications (1)

Application Number Title Priority Date Filing Date
US271745A Expired - Lifetime US1861989A (en) 1928-01-19 1928-04-21 Gas indicating apparatus

Country Status (2)

Country Link
US (1) US1861989A (de)
DE (1) DE506796C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757076A (en) * 1952-02-06 1956-07-31 Solvay Test apparatus
US3162874A (en) * 1960-11-28 1964-12-29 Illinois Tool Works Assembly machine
US3427414A (en) * 1967-01-13 1969-02-11 Sinclair Research Inc Switch assembly for detecting underground leaks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757076A (en) * 1952-02-06 1956-07-31 Solvay Test apparatus
US3162874A (en) * 1960-11-28 1964-12-29 Illinois Tool Works Assembly machine
US3427414A (en) * 1967-01-13 1969-02-11 Sinclair Research Inc Switch assembly for detecting underground leaks

Also Published As

Publication number Publication date
DE506796C (de) 1930-09-12

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