GB2474540A - Device for the selective quantitative determination of oil mist or aerosols - Google Patents

Device for the selective quantitative determination of oil mist or aerosols Download PDF

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Publication number
GB2474540A
GB2474540A GB201012979A GB201012979A GB2474540A GB 2474540 A GB2474540 A GB 2474540A GB 201012979 A GB201012979 A GB 201012979A GB 201012979 A GB201012979 A GB 201012979A GB 2474540 A GB2474540 A GB 2474540A
Authority
GB
United Kingdom
Prior art keywords
gas
measuring sensor
inlet duct
adapter housing
gas inlet
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.)
Granted
Application number
GB201012979A
Other versions
GB201012979D0 (en
GB2474540A8 (en
GB2474540B (en
Inventor
Andreas Seeck
Andreas Mohrmann
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.)
Draeger Safety AG and Co KGaA
Original Assignee
Draeger Safety AG and Co KGaA
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
Priority claimed from DE102010010112.5A external-priority patent/DE102010010112B4/en
Application filed by Draeger Safety AG and Co KGaA filed Critical Draeger Safety AG and Co KGaA
Publication of GB201012979D0 publication Critical patent/GB201012979D0/en
Publication of GB2474540A publication Critical patent/GB2474540A/en
Publication of GB2474540A8 publication Critical patent/GB2474540A8/en
Application granted granted Critical
Publication of GB2474540B publication Critical patent/GB2474540B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2208—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with impactors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0255—Investigating particle size or size distribution with mechanical, e.g. inertial, classification, and investigation of sorted collections

Abstract

A device for the selective quantitative determination of oil mist or aerosols in a gas sample comprises a measuring sensor 1 having a gas inlet duct 8, at least one micro-nozzle (4, fig 1a), an impact plate (5, fig 1), and an outlet (6, fig 1). An adapter housing 11 encapsulates the measuring sensor, and has a connection port 13 to receive the gas inlet duct and a pump connection 14 connected to the gas outlet, and arranged such that a flow-permitting connection is made via the gas inlet duct from the exterior of the adapter housing to the pump connection. The adapter housing may be provided with a cover 17 that has a viewing window 18.

Description

Device for the selective quantitative determination of oil mist or aerosols The invention relates to a device for the selective quantitative determination of oil mist or aerosols in a gas sample. A device for the selective quantitative determination of oil mist is known from DE 10 2006 023 714 B4. This known measuring sensor is based on what is known as the impactor principle under which a stream of air laden with oil mist or aerosols suddenly has its direction changed to enable the oil particles or aerosol particles which separate out to be collected on an impact plate. In the process, the gas sample to be examined flows through a plurality of micro-nozzles arranged in a circle, the diameter of which micro-nozzles is of a size such as to set a predetermined flow rate for the gas for testing. The micro-nozzles are arranged in this case at the end of a gas inlet duct and the impact plate on which the oil or aerosol particles are deposited is situated opposite the micro-nozzles. The quantity of oil or aerosol particles which collect during a given period of measurement is an indication of the oil or aerosol content of the gas sample.
The gas sample to be examined is usually taken from a source at a pressure above atmospheric, e.g. a central compressed-air supply system, to enable the gas analysis to be performed. For this purpose, the gas inlet duct of the measuring sensor is connected to the gas source by a plug-in connector and the micro-nozzles act as nozzles subject to supercritical incident flow which limit the flow rate through themselves.
A disadvantage of this known measuring sensor is that the gas analysis can only be performed on a reservoir of gas which is under pressure, whereas it is not possible for oil mist or aerosols to be detected in the ambient air.
The object underlying the invention is to improve a measuring sensor of the kind specified in such a way that oil mists or aerosols in the ambient air can be detected.
The present invention is as claimed in the claims.
features of advantageous embodiments of the device according to the invention are recited in the dependent claims.
The advantage of the device according to the invention can be seen as being that the known measuring sensor, which is designed to analyse the gas from a source of compressed gas, is inserted in an adapter housing to enable a flow of gas for testing through the measuring sensor to be produced by means of a vacuum source. For this purpose, the adapter housing has a pump connection to which either an electrically operated pump or a hand-operated gas pump can be connected. The gas for testing is drawn through the measuring sensor by the gas pump. Commercially available gas pumps such as are known in connection with the taking of gas samples for gas test tubes can be used for this purpose.
A preferred mean gas flow-rate for gas sampling is approximately 4 1/mm. The known measuring sensor can thus be used, without any modifications whatever having to be made, both for the analysis of gases from compressed air sources and for analysing the ambient atmosphere. When the ambient air is being analysed, the known measuring sensor is simply inserted in an adapter housing and the flow of sampled gas is produced by means of a source of a pressure below atmospheric by which the gas for testing is drawn through the micro-nozzle of the measuring sensor.
The adapter housing usefully comprises a bottom portion having a connecting port to receive a gas inlet duct of the measuring sensor and having a pump connection for the gas pump. The gas inlet duct of the measuring sensor is fastened in place in the connecting port in such a way that ambient air can be drawn in directly through its free end.
The free end of the bottom portion is closed off with a cover, with a viewing window which is situated opposite the impact plate of the measuring sensor being arranged in the top of the cover. The loading of the impact plate with oil or aerosol particles can thus be observed and then assessed through the viewing window in the adapter housing. For this purpose, attention is drawn to the disclosure of DE 102006023 714 B4 which is hereby incorporated in the present application by reference.
An embodiment of the invention will now be described, by way of example only, wit h reference to the accompanying drawings of which: Fig. I is a schematic perspective view of a measuring sensor; Fig 1 a is a detail cross-sectional view of a nozzle plate of the measuring sensor shown in Fig. 1; and Fig. 2 is a schematic view in longitudinal cross-sectional view of an adapter housing with a measuring sensor inserted.
Fig. 1 is a schematic view of the construction of a measuring sensor I for gas analysis. The gas 3 laden with oil particles 2, which comes from a gas source (not shown), makes its way via a gas inlet duct 8 to a nozzle plate 41 which is provided with a plurality of micro-nozzles 4 (Fig. 1 a) and at a transparent impact plate 4 it has its direction changed at right angles to the direction in which it flowed in. Because of the abrupt change in the direction of flow, the oil particles 2 are no longer able to follow the flow and are deposited on the inner side of the impact plate 5. The impact plate 5 is fixed to a main body 9 of the measuring sensor by means of a snap-on ring 10. Via gas outlets 6 arranged at the circumference of the main body 9 of the measuring sensor, the gas 3 for measurement makes its way out of the interior of the main body 9 of the measuring sensor and into the surroundings.
Via a sealing ring 42, the nozzle plate 41 rests on a supporting surface 43 of the main body 9 of the measuring sensor. The impact plate 5 is arranged opposite the nozzle plate 41 by means of a spacer ring 7. Situated on the top of the snap-on ring is a pull-off strip 44 and this is removed before a gas sample is analysed so that the impact plate 5 becomes visible.
Fig. Ia is a detail view showing the nozzle plate 41 which has a micro-nozzle 4.
Fig. 2 is a longitudinal section showing the construction of an adapter housing 11.
The adapter housing 11 contains the measuring sensor I which is shown in Fig. 1.
The adapter housing 11 has a bottom portion 12 having a connection port 13 to receive the gas inlet duct 8 of the measuring sensor 1 and a pump connection 14 for a gas pump 15. The free end 16 of the gas inlet duct 8 is so arranged that gas 3 can be drawn in from the surroundings of the adapter housing 11. The bottom portion 12 is closed off by a cover 17, with a viewing window 18 which is situated opposite the transparent impact plate 5 of the measuring sensor I being provided in the top of the cover 17. The snap-on ring 10 of the measuring sensor I is pressed against the cover 17 by means of a ring 19 of elastomer.
The gas to be examined 3, which is laden with oil particles 2, is drawn in through the gas inlet duct 8 and makes its way via the pump connection 14 to the gas pump 15.
When it does so, the oil particles 2 have previously been deposited on the impact plate 5 of the measuring sensor 1.

Claims (5)

  1. CLAIMS1. A device for the selective quantitative determination of oil mist or aerosols in a gas sample having: a gas inlet duct; a measuring sensor in the gas inlet duct which has at least one micro-nozzle for metering a predetermined flow of gas for testing an impact plate, downstream of the micro-nozzle, for separating out aerosol or oil particles; a gas outlet on the downstream side of the impact plate; and an adapter housing which encapsulates the measuring sensor and which has a connecting port to receive the gas inlet duct and a pump connection connected to the gas outlet, and arranged such that a flow-permitting connection is made via the gas inlet duct from the exterior of the adapter housing to the pump connection.
  2. 2. The device according to claim 1, in which a gas pump is connected to the pump connection.
  3. 3. The device according to claim 1 or 2, in which the adapter housing comprises a bottom portion having the connecting port and the pump connection, and a cover which can be inserted over the free end of the bottom portion.
  4. 4. The device according to claim 3, in which the cover is provided with a viewing window in the region of the impact plate.
  5. 5. A device for the selective quantitative determination of oil mist or aerosols in a gas sample substantially as hereinbefore described with reference to, and br as shown in, the accompanying figures.
GB201012979A 2009-10-17 2010-08-03 Device for the selective quantitative determination of oil mist or aerosols Active GB2474540B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009049768 2009-10-17
DE102010010112.5A DE102010010112B4 (en) 2009-10-17 2010-03-04 Device for the selective determination of the quantity of oil mist or aerosols

Publications (4)

Publication Number Publication Date
GB201012979D0 GB201012979D0 (en) 2010-09-15
GB2474540A true GB2474540A (en) 2011-04-20
GB2474540A8 GB2474540A8 (en) 2011-06-01
GB2474540B GB2474540B (en) 2011-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB201012979A Active GB2474540B (en) 2009-10-17 2010-08-03 Device for the selective quantitative determination of oil mist or aerosols

Country Status (1)

Country Link
GB (1) GB2474540B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2496003A (en) * 2011-10-26 2013-05-01 Draeger Safety Ag & Co Kgaa Method for the selective determination of a quantity of oil mist or aerosols
US8955400B2 (en) 2012-07-05 2015-02-17 Caterpillar Inc. Aerosol sampling device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003081212A2 (en) * 2002-03-16 2003-10-02 Pathogenus, Inc. Adjustable air sampler with psychrometrics for viable and non-viable aerosols
WO2007011726A1 (en) * 2005-07-14 2007-01-25 Battelle Memorial Institute Aerosol trigger device and methods of detecting particulates of interest using and aerosol trigger device
GB2438217A (en) * 2006-05-19 2007-11-21 Draeger Safety Ag & Co Kgaa Device and method for the selective determination of the quantity of oil mist in a gas sample

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060000297A1 (en) * 2004-07-02 2006-01-05 Gussman Robert A Ambient particulate sampler inlet assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003081212A2 (en) * 2002-03-16 2003-10-02 Pathogenus, Inc. Adjustable air sampler with psychrometrics for viable and non-viable aerosols
WO2007011726A1 (en) * 2005-07-14 2007-01-25 Battelle Memorial Institute Aerosol trigger device and methods of detecting particulates of interest using and aerosol trigger device
GB2438217A (en) * 2006-05-19 2007-11-21 Draeger Safety Ag & Co Kgaa Device and method for the selective determination of the quantity of oil mist in a gas sample

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2496003A (en) * 2011-10-26 2013-05-01 Draeger Safety Ag & Co Kgaa Method for the selective determination of a quantity of oil mist or aerosols
GB2496003B (en) * 2011-10-26 2014-03-12 Draeger Safety Ag & Co Kgaa Method for the selective determination of a quantity of oil mist or aerosols
US8767211B2 (en) 2011-10-26 2014-07-01 Dräger Safety AG & Co. KGaA Process for the selective determination of oil mist or aerosols
US8955400B2 (en) 2012-07-05 2015-02-17 Caterpillar Inc. Aerosol sampling device

Also Published As

Publication number Publication date
GB201012979D0 (en) 2010-09-15
GB2474540A8 (en) 2011-06-01
GB2474540B (en) 2011-12-28

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