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WO1990015319A1 - Arrangement for preparing a sample of an odour substance prior to identification - Google Patents

Arrangement for preparing a sample of an odour substance prior to identification Download PDF

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Publication number
WO1990015319A1
WO1990015319A1 PCT/HU1990/000016 HU9000016W WO9015319A1 WO 1990015319 A1 WO1990015319 A1 WO 1990015319A1 HU 9000016 W HU9000016 W HU 9000016W WO 9015319 A1 WO9015319 A1 WO 9015319A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
arrangement
odour
sample
substance
Prior art date
Application number
PCT/HU1990/000016
Other languages
French (fr)
Inventor
Péter Teleki
Original Assignee
Teleki Peter
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 Teleki Peter filed Critical Teleki Peter
Publication of WO1990015319A1 publication Critical patent/WO1990015319A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/405—Concentrating samples by adsorption or absorption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces

Definitions

  • the present invention refers to an arrangement f or preparing a sample of an odour substance prior to identification.
  • the arrangement proposed by the invention is applicable for the use in equipments for controlling closed spaces or in monitoring systems of fire-extinguisher networks.
  • the odour substances characterised mostly by their shape and electric charges are present in the air rather in very low concentration.
  • the most effective method of identifying a specific odour substance is to apply a dog trained to sense it.
  • the dog's smell is very sensitive and superior practically to all apparatuses made by men.
  • the gas analyser means are applicable for identifying soffit- odour substances supposed that the last are present in a concentration exceeding a lower threshold.
  • the gas analysers can be used to meaisuring concentration of predetermined substances, e.g. smoke aerosols and generating warning or control signal if a threshold value is reached. This is a problem of monitoring system applied e.g. in hotels or in stores.
  • the present invention is based on the recognition that the odour substance to be identified can be collected in adsorbing means arranged in a closed space.
  • the odour substance of relatively high concentration can show features differing from those of the odour substances assigned to the objects in their normal state.
  • the object of the invention is an arrangement for preparing a sample of an odour substance prior to identification, with the novel features of comprising inlet means for receiving a gaseous medium including an odour substance to be identified, outlet means for expelling the gaseous substance after substantial removal of the odour substance therefrom, a sample collector having a vessel for receiving the gaseous medium, the vessel being arranged between the inlet means and outlet means and a heat exchanger unit connected with the sample collector, wherein the sample collector is equipped with valves in the inlet means and outlet means for sealing the vessel and with an adsorber unit having adsorbing insert means for collecting molecules forming a sample of the odour substance and the outlet means are preferably connected to a gas analyser.
  • the vessel is advantageously equipped with guiding means for receiving the adsorber unit and sealing it in the walls of the vessel.
  • an outer vessel is applied which is in heat exchange communication with the vessel.
  • This outer vessel can preferably constitute a pipe coil or an outer space surrounding the vessel, the outer vessel being closed by valves on its respective inlet and outlet pipes.
  • the vessel is advantageously equipped with at least one condenser for facilitating the preparation of a sample of an odour substance having electric (dipole) charge.
  • the- inlet means are connected to a compartment of a controlled space or to a whole, undivided controlled space receiving an object bearing at least one odour substance to be identified.
  • the arrangement of the invention is capable of preparing samples of odour substances for identifying by gas analysators or subjective means and makes simultanous control of a gas space by a gas analysator unit possible.
  • FIG. 1 is the cross-section of a sample collector unit of the arrangement of the invention
  • FIG. 2 shows a block diagram of an arrangement for controlling a divided space
  • FIG. 3 shows a block diagram of an arrangement for controlling an undivided space.
  • the arrangement of the invention is based on a sample collector unit 1 (Fig. 1) including a vessel 19 determining a closed space limited by walls 2 for receiving a gaseous medium bearing at least one odour substance to be identified.
  • the vessel 19 is equipped with respective inlet means 10 and outlet means 20 having pipe sections which can be closed by valves 11, 21 farming, if necessary, controlable units.
  • the inlet means 10 are made with a pipe section intruding into the inner space of the vessel 19 in order to ensure favourable transport conditions of the gaseous medium. Similar pipe section may be applied also in the outlet means 20, if required.
  • the valves 11 and 21 the vessel 19 can be hermetically sealed.
  • an adsorber unit 18 is arranged in a way ensuring the hermetical sealing.
  • the adsorber unit 18 itself or a part thereof is guided in the wall 2 and generally in the vessel 19 so that it can form a replaceable unit bearing adsorbing insert means 8 arranged e.g. on a supporting member 7 having a support 31 within the adsorber unit 13.
  • the adsorbing insert means 8 made of an appropriate adsorber for binding the molecules of an odour substance are advantageously placed in a nest determined from the lower side by the support 31 and by an inclined plate 5 from the upper side, the inclined plate 5 forming a guiding way acting on gravitational effect to the material moving on the wall 2 from top to bottom.
  • the adsorber unit 18 is equipped with a handle 4 whereby it or its insert part can be replaced when the adsorbing. insert means 31 should be removed.
  • the effectiveness of the operation of the sample collector unit 1 is generally regulated from one side by ensuring increased inner pressure by closing the valves 11 and 21 and by regulating the inner temperature from the other. It can be further improved, if the odour substance is consisted of molecules having dipole charge through the application of electric field generated by one or more condenseris) 9 arranged within the vessel 9.
  • the temperature regulation is possible e.g. through a pipe coil surrounding the vessel 19. More preferably, as illustrated in Fig. 1, the vessel 19 constitutes a double-wall container with .an outer vessel 3 connected to an inlet pipe 12 at the inlet means 10 and to an outlet pipe 22 at the outlet means 20. In the inlet and outlet pipes 12 and 22 control valves 13 and 23 are present.
  • the adsorber unit 18 is hermetically sealed also in the outer vessel 3 and, if thereby the outer vessel 3 is divided into two independent parts, it comprises connecting pi ⁇ e(s) 6 for ensuring free gas and liquid communication between the parts separated by the adsorber unit 13.
  • the sample collector unit 1 can be applied in differont arrangements, e. g. in those shown in Fig. 2 and 3. In both cases spaces are under steady or occasional control. According the Fig. 2 a controlled space is shared into space compartments 41, e.g. freight container units, luggage boxes or simply hotel apartments. The space compartments 41 are connected by control valves 43 with a compressor 44 for transporting a gaseous medium to the inlet means 10 of the sample collector unit 1. The output of the sample collector unit 1, i.e. the outlet means 20 thereof is coupled with the input of a gas analyser 45.
  • space compartments 41 e.g. freight container units, luggage boxes or simply hotel apartments.
  • the space compartments 41 are connected by control valves 43 with a compressor 44 for transporting a gaseous medium to the inlet means 10 of the sample collector unit 1.
  • the output of the sample collector unit 1, i.e. the outlet means 20 thereof is coupled with the input of a gas analyser 45.
  • the controlled space can be also a room 42, e.g. a hotel apartment included into an automatically operated fire and smoke monitoring system.
  • a compressor 44 is arranged in an air inlet 44 for causing air flow through the room 42 and leave it through the control valve 43.
  • the output of the control valve 43 is connected by another compressor 44 with the inlet means 10 of the sample collector unit 1.
  • the outlet means 20 constitute in this system a pipe divided into two parts, one of them forming an input part of the gas analyser 45, and the other denoted by 24 can be closed by a control valve 25.
  • the control valve 25 should be opened for equalizing pressure when the gas analyser 45 may not be exposed to the action of a stream of an Dverpressurized gas.
  • the room 42 is connected further with a ventilation exhaust 52 and inputs 52 and 53 for introducing different agents and media if necessary (e.g. water or specific fire extinguishing gas etc.).
  • An output 55 is applied for taking water away if the room 42 is arranged so that the object therein should be washed.
  • the arrangement of the invention operates in the following way:
  • the gaseous medium flows over the input means 10 into the vessel 18 and leaves the last by the output means 20 passing the adsorbing insert means B arranged on the support 31.
  • the adsorber contacts and binds the odour molecules accelerated by the electric field generated by a condenser 9, if necessary.
  • the wall 2 of the vessel 19 can be cooled or warmed by heat exchange ensured through the action of a medium flowing in the outer vessel 3.
  • the cooling effect is advantageous if the odour substance can effectively be collected in liquid form when it flows on the inner wall 2, then on the inclined plate 5 to the adsorbing insert means 8.
  • the warming effect can be preferred when the increased volatility of the odour substance results in improved effectiveness of the adsorption process.
  • the effectiveness can be further influenced by the application of an overpressure in the vessel 19 when the control valve 21 is closed and for a time the control valve 11 can be closed, too. In this way the conditions of high effectivity heat exchange between the outer vessel 3 and the content of the space limited by the wall 2 are assured.
  • the adsorbing insert means 8 removed from the sample collector unit 1 can be investigated in known ways, e.g. by specific appliances for identifying the components of the odour- substance collected therein or by a dog for detecting whether a specific substance is present.
  • the arrangements as shown in Figures 2 and 3 are intended for use in different monitoring systems.
  • the space coin- partments 41 e.g. luggage boxes can be controlled for stating whether they comprise drugs or explosives.
  • the sample collector unit 1 is applied for binding one group of the components and the gaseous stream expelled by the outlet means 20 is investigated by the gas analyser 45.
  • the adsorbing insert means 3 can regularly be removed from the sample collector unit 1 and analysed in the known ways. By closing at least one of the control valves 43 it is possible to select the space compartment (s) 41 to be monitored.
  • Fig. 3 can be operated in a manner similar to that referring to Fig. 2.
  • the input and output means connected to the controlled space 42 assure conditions of making different media flow as required by the monitoring or investigating process.
  • the arrangement of the invention renders possible to carry out high effectivity investigations of odour substances either collected on an adsorber, either transported to a gas analyser unit.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

An arrangement for preparing a sample of an odour substance prior to identification comprises inlet means (10) for receiving a gaseous medium including an odour substance to be identified, outlet means (20) for expelling the gaseous substance after substantial removal of the odour substance therefrom, a sample collector (1) having a vessel (19) for receiving the gaseous medium, the vessel (19) being arranged between the inlet means (10) and outlet means (20) and a heat exchanger unit connected with the sample collector, wherein the sample collector (1) is equipped with valves (11, 21) in the inlet means (10) and outlet means (20) for sealing the vessel (19) and with an adsorber unit (18) having adsorbing insert means (8) for collecting molecules forming a sample of the odour substance.

Description

ARRANGEMENT FOR PREPARING A SAMPLE OF AN ODOUR SUBSTANCE PRIOR TO IDENTIFICATION
FIELD OF THE INVENTION
The present invention refers to an arrangement f or preparing a sample of an odour substance prior to identification. The arrangement proposed by the invention is applicable for the use in equipments for controlling closed spaces or in monitoring systems of fire-extinguisher networks.
BACKKROUND OF THE INVENTION The odour substances characterised mostly by their shape and electric charges are present in the air rather in very low concentration. The most effective method of identifying a specific odour substance is to apply a dog trained to sense it. The dog's smell is very sensitive and superior practically to all apparatuses made by men.
The gas analyser means are applicable for identifying soffit- odour substances supposed that the last are present in a concentration exceeding a lower threshold. Thus, the gas analysers can be used to meaisuring concentration of predetermined substances, e.g. smoke aerosols and generating warning or control signal if a threshold value is reached. This is a problem of monitoring system applied e.g. in hotels or in stores.
It is known that the majority of the odour substances has electric charge of a given sign. Therefore it is also a known solution to detect whether in an aerosol molecules forming electric dipoles are present. If the amount of such molecules exceeds a predetermined threshold levels, the gas analyser eans can be applied for identifying.
SUMMARY OF THE INVENTION
Hence, a need has been felt since long time for creating an arrangement for the reliable identification of the odour substances. The invention is intended even to elaborate a solution meeting this need.
The present invention is based on the recognition that the odour substance to be identified can be collected in adsorbing means arranged in a closed space. However, the odour substance of relatively high concentration can show features differing from those of the odour substances assigned to the objects in their normal state.
Thus, the object of the invention is an arrangement for preparing a sample of an odour substance prior to identification, with the novel features of comprising inlet means for receiving a gaseous medium including an odour substance to be identified, outlet means for expelling the gaseous substance after substantial removal of the odour substance therefrom, a sample collector having a vessel for receiving the gaseous medium, the vessel being arranged between the inlet means and outlet means and a heat exchanger unit connected with the sample collector, wherein the sample collector is equipped with valves in the inlet means and outlet means for sealing the vessel and with an adsorber unit having adsorbing insert means for collecting molecules forming a sample of the odour substance and the outlet means are preferably connected to a gas analyser.
In the arrangement of the arrangement the vessel is advantageously equipped with guiding means for receiving the adsorber unit and sealing it in the walls of the vessel. In an advantageous embodiment of the arrangement proposed by the invention an outer vessel is applied which is in heat exchange communication with the vessel. This outer vessel can preferably constitute a pipe coil or an outer space surrounding the vessel, the outer vessel being closed by valves on its respective inlet and outlet pipes.
In the arrangement of the invention the vessel is advantageously equipped with at least one condenser for facilitating the preparation of a sample of an odour substance having electric (dipole) charge.
It is also preferred when the- inlet means are connected to a compartment of a controlled space or to a whole, undivided controlled space receiving an object bearing at least one odour substance to be identified.
The arrangement of the invention is capable of preparing samples of odour substances for identifying by gas analysators or subjective means and makes simultanous control of a gas space by a gas analysator unit possible. BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be further described on the basis of the preferred embodiments shown by way of examples only. In this description reference will be made to the attached drawings, wherein
FIG. 1 is the cross-section of a sample collector unit of the arrangement of the invention,
FIG. 2 shows a block diagram of an arrangement for controlling a divided space,
FIG. 3 shows a block diagram of an arrangement for controlling an undivided space. DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
The arrangement of the invention is based on a sample collector unit 1 (Fig. 1) including a vessel 19 determining a closed space limited by walls 2 for receiving a gaseous medium bearing at least one odour substance to be identified. The vessel 19 is equipped with respective inlet means 10 and outlet means 20 having pipe sections which can be closed by valves 11, 21 farming, if necessary, controlable units. The inlet means 10 are made with a pipe section intruding into the inner space of the vessel 19 in order to ensure favourable transport conditions of the gaseous medium. Similar pipe section may be applied also in the outlet means 20, if required. By the valves 11 and 21 the vessel 19 can be hermetically sealed. In the vessel 19 an adsorber unit 18 is arranged in a way ensuring the hermetical sealing. The adsorber unit 18 itself or a part thereof is guided in the wall 2 and generally in the vessel 19 so that it can form a replaceable unit bearing adsorbing insert means 8 arranged e.g. on a supporting member 7 having a support 31 within the adsorber unit 13. The adsorbing insert means 8 made of an appropriate adsorber for binding the molecules of an odour substance are advantageously placed in a nest determined from the lower side by the support 31 and by an inclined plate 5 from the upper side, the inclined plate 5 forming a guiding way acting on gravitational effect to the material moving on the wall 2 from top to bottom. The adsorber unit 18 is equipped with a handle 4 whereby it or its insert part can be replaced when the adsorbing. insert means 31 should be removed.
The effectiveness of the operation of the sample collector unit 1 is generally regulated from one side by ensuring increased inner pressure by closing the valves 11 and 21 and by regulating the inner temperature from the other. It can be further improved, if the odour substance is consisted of molecules having dipole charge through the application of electric field generated by one or more condenseris) 9 arranged within the vessel 9.
The temperature regulation is possible e.g. through a pipe coil surrounding the vessel 19. More preferably, as illustrated in Fig. 1, the vessel 19 constitutes a double-wall container with .an outer vessel 3 connected to an inlet pipe 12 at the inlet means 10 and to an outlet pipe 22 at the outlet means 20. In the inlet and outlet pipes 12 and 22 control valves 13 and 23 are present. The adsorber unit 18 is hermetically sealed also in the outer vessel 3 and, if thereby the outer vessel 3 is divided into two independent parts, it comprises connecting piρe(s) 6 for ensuring free gas and liquid communication between the parts separated by the adsorber unit 13.
The sample collector unit 1 can be applied in differont arrangements, e. g. in those shown in Fig. 2 and 3. In both cases spaces are under steady or occasional control. According the Fig. 2 a controlled space is shared into space compartments 41, e.g. freight container units, luggage boxes or simply hotel apartments. The space compartments 41 are connected by control valves 43 with a compressor 44 for transporting a gaseous medium to the inlet means 10 of the sample collector unit 1. The output of the sample collector unit 1, i.e. the outlet means 20 thereof is coupled with the input of a gas analyser 45.
The controlled space can be also a room 42, e.g. a hotel apartment included into an automatically operated fire and smoke monitoring system. In this case a compressor 44 is arranged in an air inlet 44 for causing air flow through the room 42 and leave it through the control valve 43. The output of the control valve 43 is connected by another compressor 44 with the inlet means 10 of the sample collector unit 1. The outlet means 20 constitute in this system a pipe divided into two parts, one of them forming an input part of the gas analyser 45, and the other denoted by 24 can be closed by a control valve 25. The control valve 25 should be opened for equalizing pressure when the gas analyser 45 may not be exposed to the action of a stream of an Dverpressurized gas. The room 42 is connected further with a ventilation exhaust 52 and inputs 52 and 53 for introducing different agents and media if necessary (e.g. water or specific fire extinguishing gas etc.). An output 55 is applied for taking water away if the room 42 is arranged so that the object therein should be washed.
The arrangement of the invention operates in the following way:
The gaseous medium flows over the input means 10 into the vessel 18 and leaves the last by the output means 20 passing the adsorbing insert means B arranged on the support 31. The adsorber contacts and binds the odour molecules accelerated by the electric field generated by a condenser 9, if necessary. For improving the conditions of the adsorption process the wall 2 of the vessel 19 can be cooled or warmed by heat exchange ensured through the action of a medium flowing in the outer vessel 3. The cooling effect is advantageous if the odour substance can effectively be collected in liquid form when it flows on the inner wall 2, then on the inclined plate 5 to the adsorbing insert means 8. The warming effect can be preferred when the increased volatility of the odour substance results in improved effectiveness of the adsorption process. The effectiveness can be further influenced by the application of an overpressure in the vessel 19 when the control valve 21 is closed and for a time the control valve 11 can be closed, too. In this way the conditions of high effectivity heat exchange between the outer vessel 3 and the content of the space limited by the wall 2 are assured.
The adsorbing insert means 8 removed from the sample collector unit 1 can be investigated in known ways, e.g. by specific appliances for identifying the components of the odour- substance collected therein or by a dog for detecting whether a specific substance is present.
The arrangements as shown in Figures 2 and 3 are intended for use in different monitoring systems. The space coin- partments 41, e.g. luggage boxes can be controlled for stating whether they comprise drugs or explosives. The sample collector unit 1 is applied for binding one group of the components and the gaseous stream expelled by the outlet means 20 is investigated by the gas analyser 45. The adsorbing insert means 3 can regularly be removed from the sample collector unit 1 and analysed in the known ways. By closing at least one of the control valves 43 it is possible to select the space compartment (s) 41 to be monitored.
The arrangement of Fig. 3 can be operated in a manner similar to that referring to Fig. 2. The input and output means connected to the controlled space 42 assure conditions of making different media flow as required by the monitoring or investigating process.
The arrangement of the invention renders possible to carry out high effectivity investigations of odour substances either collected on an adsorber, either transported to a gas analyser unit.

Claims

WHAT I CLAIM IS:
1. An arrangement for preparing a sample of an odour substance prior to identification, characterized in comprising inlet means (10) for receiving a gaseous medium including an odour substance to be identified, outlet means (20) for expelling the gaseous substance after substantial removal of the odour substance therefrom, a sample collector (1) having a vessel (19) for receiving the gaseous medium, the vessel (19) being arranged between the inlet means (10) and outlet means (20) and a heat exchanger unit connected with the sample collector, wherein the sample collector (1) is equipped with valves (11, 21) in the inlet means (10) and outlet means (20) for sealing the vessel (19) and with an adsorber unit (18) having adsorbing insert means (8) for collecting molecules forming a sample of the odour substance.
2. The arrangement as set forth in claim 1, characterized in that the vessel (19) is equipped with guiding means for receiving the adsorber unit (18) and sealing it in the walls (2; of the vessel (19).
3. The arrangement as set forth in claim 1 or 2, characterized in further comprising an outer vessel (3) in heat exchange communication with the vessel (19).
4. The arrangement as set forth in claim 3, characterized in that the outer vessel (3) is made form of a pipe coil.
5. The arrangement as set forth in claim 3, characterized in that the outer vessel (3) constitutes an outer space surrounding the vessel (19), the outer vessel (3) being closed by valves (13, 23) on respective inlet and outlet pipes (12, 22).
6. The arrangement as set forth in any of claims 1 to 5, one condenser (9) for facilitating the preparation of a sample of an odour substance having electric charge.
7. The arrangement as set forth in any of claims 1 to 6, characterized in that the inlet means (10) are connected to a compartment of a controlled space (41) receiving an object bearing at least one odour substance to be identified.
B. The arrangement as set forth in any of claims 1 to 6, characterized in that the inlet means (10) are connected to a a controlled space (42) receiving an object bearing at least one odour substance to be identified.
9. The arrangement as set forth in any of claims 1 to 8, characterized in that the outlet means (20) are connected to a gas analyser (45).
PCT/HU1990/000016 1989-06-08 1990-03-07 Arrangement for preparing a sample of an odour substance prior to identification WO1990015319A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU2917/89 1989-06-08
HU291789A HUT57444A (en) 1989-06-08 1989-06-08 Device for preparing sample of odour to the identification

Publications (1)

Publication Number Publication Date
WO1990015319A1 true WO1990015319A1 (en) 1990-12-13

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PCT/HU1990/000016 WO1990015319A1 (en) 1989-06-08 1990-03-07 Arrangement for preparing a sample of an odour substance prior to identification

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AU (1) AU5284990A (en)
HU (1) HUT57444A (en)
WO (1) WO1990015319A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923687A1 (en) * 2006-11-20 2008-05-21 Renault s.a.s. Selective sampling device of exhaust gases for a motor test bench

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH181580A (en) * 1935-04-17 1935-12-31 Sulzer Ag Air control system working according to the detector principle.
US3357257A (en) * 1966-01-28 1967-12-12 Ree Du Gas sampling and detecting system
US4718268A (en) * 1985-06-04 1988-01-12 British Aerospace Public Limited Company Method and apparatus for detecting a contraband substance
US4819477A (en) * 1986-02-27 1989-04-11 Mds Health Group Limited Method and apparatus for trace sample collection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH181580A (en) * 1935-04-17 1935-12-31 Sulzer Ag Air control system working according to the detector principle.
US3357257A (en) * 1966-01-28 1967-12-12 Ree Du Gas sampling and detecting system
US4718268A (en) * 1985-06-04 1988-01-12 British Aerospace Public Limited Company Method and apparatus for detecting a contraband substance
US4819477A (en) * 1986-02-27 1989-04-11 Mds Health Group Limited Method and apparatus for trace sample collection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923687A1 (en) * 2006-11-20 2008-05-21 Renault s.a.s. Selective sampling device of exhaust gases for a motor test bench
FR2908884A1 (en) * 2006-11-20 2008-05-23 Renault Sas SELECTIVE SAMPLING DEVICE FOR MOTOR TEST BENCH

Also Published As

Publication number Publication date
AU5284990A (en) 1991-01-07
HUT57444A (en) 1991-11-28

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