Abstract: An in situ reactor for use in a geological strata includes a liner defining a centrally disposed passageway and a sampling conduit received within the passageway. The sampling conduit may be used to receive a geological specimen derived from geological strata therein and a lysimeter is disposed within the sampling conduit in communication with the geological specimen. Fluid may be added to the geological specimen through the passageway defined by the liner, between an inside surface of the liner and an outside surface of the sampling conduit. A distal portion of the sampling conduit may be in fluid communication with the passageway.

Abstract: A personal nanoparticle sampler is disclosed to include a pre-classifier, a nozzle, a particle-sizing filter pack and a final filter pack. The particle-sizing filter pack and the final filter pack respectively accommodate a particle-sizing filter and a final filter to collect nanoparticles smaller than a diameter. The pre-classifier removes large particles to avoid clogging of the particle-sizing filter pack. The nozzle raises the airflow velocity to reduce the cut-off diameter of the particle-sizing filter without increasing the total flowrate, allowing the personal nanoparticle sampler to be used with a personal sampling pump.

Abstract: The present invention provides a method and system for collecting and storing an atmospheric sample for eventual analysis, where the atmospheric sample includes a mixture of at least a matrix and an analyte. In one implementation, the system includes a housing; a sample cartridge removably attached to the housing, and a pump integrated with the housing and in fluid communication with the sample cartridge, the pump being configured to draw the atmospheric sample through the sample cartridge and to subsequently evacuate the matrix from the sample cartridge. The sample cartridge includes a low thermal mass cylinder with a first end and a second end; an inlet port with a gas-tight inlet valve at the first end of the cylinder, an outlet port with a gas-tight outlet valve at the second end of the cylinder, and a sorbent material disposed within the cylinder and adapted to trap the analyte from the atmospheric sample.

Abstract: An air filter housing (1) has at least one filter chamber (2, 3) for receiving at least one filter unit (F), the filter chamber having an inlet end and an outlet end, and elements (18, 19) for measuring particle concentration in the air leaving the filter chamber. The measuring elements (18, 19) include a row of several particle detectors (20) affixed to a common support (21), members (23-31) for moving the support in a direction perpendicular to the row of detectors, and members for connecting each of the detectors to a counter.

Abstract: A device and a method provide a detection of a presence of a test gas. The device comprises a vacuum chamber connected to a vacuum pump equipped with an electronic power supply unit. At least one portion of the chamber is separated from a surrounding outside environment by a membrane selectively permeable to the test gas. A gas flow from the outside environment is guided forcefully over the surface of the membrane via a flow conveyor, which comprises an inlet duct, a diffuser and an outlet duct. The presence of any test gas is detected by the changes in the electrical current to the vacuum pump provided by the power supply.

Abstract: A particle size sampler includes a cylindrical housing with an inlet end and an outlet end. A pump, connected to an outlet pipe at the outlet end, draws air through the particle size sampler. Aerosols or other particles are removed from the air during a series of filtering steps. The filtering steps include an impactor, a plurality of mesh screens, and a backup filter to remove any particles remaining after the previous filtering steps. The particle size sampler may operate for long periods of time providing a size distribution and concentration of small particles in the air.

Abstract: A filter assembly for use in sidestream gas sampling assembly. The filter assembly of the present invention includes a hydrophilic member that is constructed from a porous material and is situated such that gas entering the filter assembly passes through at least a portion the hydrophilic member. In a further embodiment, the filter includes a hydrophobic member positioned downstream of the hydrophilic member. The hydrophobic member acts as a second line of defense against moisture reaching the sensing mechanism in the gas sampling assembly.

Abstract: An embodiment of the invention provides a production process of sand including the extraction of sand from a quarry; the periodic, on-line and automated withdrawal of a sample of sand; and the automated measurement of the methylene blue value on the sample of sand. Another embodiment of the invention provides a production line of sand including means of extraction of sand from a quarry; periodic and automated means of withdrawal of a sample of sand; and automated means of measuring the methylene blue value for the sample of sand.

Abstract: A method and system for collecting airborne particles and hydrating the collected particles for analysis. The airborne particles, which may be biological contaminants, are collected from a container containing one or more mailpieces. In the collection stage, a dry filter collection assembly is connected to the container and air is drawn out of the container through a dry filter. A hydration solution is then injected into the collection assembly to hydrate the collected particles. Part of the hydration solution containing the collected particles is caused to move out of the collection assembly to a test cartridge for further testing.

Abstract: In an apparatus for determining the filterability of fluids, in particular of transmission oils, having a test filter device (21), through which a sample amount of the fluid can flow, and a line system which forms a circulation circuit (1) for the fluid, said line system comprises a foam tester (3) which receives the sample amount of the fluid, the filter device (21) and a circulating pump (23) which removes fluid from the sample amount which is situated in the foam tester (3) and conveys it through the filter device (21) and back to the foam tester (3).

Abstract: A hand held detector system that has a housing with a passage that can receive a sample, and a concentrator that captures the sample. The hand held system further includes a single detector coupled to the concentrator and a fluid system that provides fluid communication between the housing passage and the concentrator, and between the concentrator and the detector. The system is powered by a battery. The system may include a controller that heats the concentrator with a temperature profile that causes a first trace molecule to desorb at a time different from the desorption of a second trace molecule. The system and components may be powered by a battery.

Abstract: A device is displayed for determining an organic and inorganic fraction of a sample, which comprises a suspension medium, particularly water, and also solids. A preferably tightly sealable treatment chamber is provided, which comprises a sampling device, a filter unit, which is constructed and attached to the sampling device such that the suspension medium can be removed from the sample through the filter unit, a suction device for removing the suspension medium, a heat energy source for supplying heat energy to the sample, a temperature measuring unit for recording the temperature of the sample, a weighing unit for weighing the sample and a control and data evaluation unit, for controlling the energy source and for receiving and storing output signals from the temperature measuring unit and also the weighing unit. All parts of the device are constructed so that a sample can be analysed within the treatment chamber, without having to remove it in the interim. This represents a considerable time saving.

Abstract: A fluid testing apparatus and associated method include a testing chamber, a filter storage device and a filter transfer mechanism. The testing chamber has a sample volume, a filtrate collection reservoir, an opening between the sample volume and the filtrate collection reservoir, and at least one port into the sample volume. The filter transfer mechanism positions at least one filter in the opening. The opening is closed and a sample fluid, introduced into the port, at least partially fills the sample volume. The sample volume is pressurized and a filtrate of the sample fluid flows from the sample volume, through the filter into the filtrate collection reservoir. The volume of filtrate passing into the filtrate collection reservoir is measured and the sample fluid from sample volume is discharged. The filtrate is discharged from the filtrate collection reservoir, and the filter transfer mechanism removes the filter.

Abstract: Methods of concentrating an analyte that is in liquid and method of detecting an analyte in a liquid are disclosed. Methods of screening a liquid for the presence of an analyte are also disclosed. Processes comprising continuously collecting a sample of fluid throughout the process and analyzing the sample are disclosed as are processes comprising treating ultrafilter membranes. Devices and systems for concentrating an analyte that is in liquid and for screening a liquid for an analyte are disclosed as well as devices and systems for concentrating an analyte from a continuous sample are disclosed.

Abstract: Apparatus for use in measuring properties of media formed from a particulate suspension. The apparatus includes a media sampler coupled to feed pipes to allow media to flowing therethrough to be sampled and a connector for coupling the media sampler to a sensor for sensing properties of the sampled media.

Abstract: A uniform aerosol deposit sampling device includes a first housing and a second housing. The first housing has an air inlet and a first chamber. The second housing has an air outlet, an second chamber, a filter holder and a flow guiding portion. The filter holder is provided for securing an air-penetratable supporting pad and a filter media. The flow guiding portion is a substantially conical and gradually narrowing. The flow guiding portion has a semi-conical angle ranged from 15 to 85 degrees. So, the flow guiding portion makes the entire air flow smooth and evenly distributed. The aerosols will be evenly distributed and uniformly deposited on the filter media. And, it is easy to evaluate the amount and composition of the aerosols.

Abstract: Methods and apparatus for extracting gas samples from a particle-laden fluid stream are disclosed. An exemplary sampling probe apparatus includes a probe head having an upstream face and a downstream face, an intake orifice inwardly tapering from the upstream face into a central bore region of a cavity within the probe head, and an outlet orifice outwardly tapering from said central bore region to the downstream face, so as to permit fluid gas flow through the central bore region of the cavity. A filter device disposed within the cavity of the probe head extends between the intake orifice and the outlet orifice so as to divide a low-pressure sampling region of the cavity from the central bore region. A sampling tube in fluid communication with the low-pressure sampling region provides for extracting gas samples from the low-pressure sampling region of the cavity.

Abstract: This invention is directed to a method and system for particle entrained fluid sampling. The invention is specifically directed to a system capable of sampling a high pressure and/or high flow rate fluid flow system using a means for applying pressure or suction to the fluid sample in the fluid sampling system operatively connected to a sample extractor and a sample analysis device. The means for applying pressure or suction is adjustable to provide control over the sample flow in the fluid sampling system. The fluid sampling system of the present invention may be particularly applicable to monitoring the condition of hydraulic and lubrication systems.

Abstract: A method and system to deposit rapidly, accurately and efficiently liquid droplets onto a sample plate. A liquid from which the droplet is formed contains sample molecules, matrix molecules or a mixture of both sample and matrix molecules. A sample plate is positioned with respect to a position below a portion of the liquid, such as a droplet. A power supply forms an electric field between the sample plate and the liquid, which pulls the droplet to a target location on the sample plate. A plurality of capillary columns is provided for simultaneous or successive multiple depositions via application of one or more high voltage pulses between the liquid sample array and a sample plate.

Abstract: A method of providing a filter element for a dust collector having at least one circular blowpipe and pulse arrangement includes measuring an inside diameter of the blowpipe; and selecting a filter element having a width that is 7.125±0.75 inches times the inside diameter of the blowpipe; and a length that is 2.2-3.3 times the width.

Abstract: An explosive and narcotics detection system detects the presence of trace particles of materials that are adhering to surfaces. In order to detect such particles, to the particles are first dislodged or released from the surface, then transported to the detection instrument, and then accumulated on or in a particle collection device. When the sample collecting system and the target surface are in relative motion across the line-of-sight greater than fifteen centimeters per second, non-contact sample collection may be accomplished using a vortex or vortex attractor particle collector together with a plurality of air or aerosol jets. A plurality of large diameter vortex collectors may obtain samples at relative line-of-sight velocities greater than five feet per second over a large surface area and for a complex-shaped surface.

Abstract: A filtering system for monitoring fluid emissions from a process includes a plurality of filter assembly sections arranged in a parallel fluid flow manner with respect to each other so as to selectively receive a sample fluid (e.g., a sample gas) entering at an inlet of the system. Each filter assembly section includes a filter unit to filter particulate materials from a fluid flowing through the filter, first and second valves disposed at upstream and downstream locations of the filter unit, and a blowback flow path configured to selectively direct a cleaning fluid through the filter unit in a direction that opposes a direction in which the sample fluid flows through the filter unit. Each filter assembly section can be selectively isolated from other portions of the system so as to prevent the sample fluid from flowing through the filter assembly section while allowing a cleaning fluid to be delivered through the blowback flow path of the filter assembly section.

Abstract: A passive air sampler or badge suitable for wearing includes a vial adaptor to facilitate transferring granular or particulate adsorbent to and from it directly into a specially designed vial sized to accommodate a standard amount for use in a desorption tube for chromatographic or other analysis of the materials desorbed.

Abstract: A method and apparatus for the physical separation of components from a multi-phase fluid stream into its component phases. More particularly, the invention relates to a housing for a phase separation medium which allows one to change the phase separation medium without the necessity of disconnecting the flow lines. An alternative embodiment of the present invention contemplates a housing incorporating a unique internal valve configuration for controlling and limiting the fluid pressure differential across the sheet of phase-separating material. The internal valve begins to throttle or reduce the fluid flow rate through the sheet of phase-separating material after the differential pressure across the sheet of phase-separating material exceeds a preset value. If throttling the fluid flow rate cannot prevent the differential pressure from exceeding the preset limit, then the internal valve will shut off the fluid flow completely.

Abstract: A method is provided for sampling hot gas. The method includes inserting a probe into a flow of hot gas, and collecting a sample of the hot gas with the probe. The sample of the hot gas is quenched prior to an analysis of the sample.

Abstract: The present invention relates to a system for pretreating a test sample in order to analyze a test sample containing suspended solids in an on-line analyzer can, and more particularly to an ultra filtration system for an on-line analyzer for filtering suspended solids in order to stably quantitatively analyze a test sample containing a large amount of suspended solids using a module-type hollow fiber membrane filter intake system in an online analyzer. The ultra filtration system according to the present invention may be useful to obtain a reliable analysis result of a test sample using a filtered water in the field of environments, foods, chemistry, microorganisms, etc.

Abstract: A particle filter for an internal combustion engine, in particular a soot particle filter, can be tested. The filter is subjected at the inlet side to a hot gas flow which is laden with particles. The particles are supplied to the hot gas flow from a particle storage container by means of a dosing device. The quantity of particles which is introduced into the hot gas flow during a predefined measurement time period is determined by weighing the particle storage container. There is also provided a configuration for carrying out the method.

Abstract: In a process for testing filters (4) and (13) of treatment fluid of a hemodiafiltration apparatus (1), each filter has a wet semipermeable membrane (5, 14) which separates a gas-filled first chamber (6 and 15) from a liquid-filled second chamber (7 and 16). The first chambers are pressurised by a pump (19) supplying air, while the second chambers are placed in depression by a drainage pump (17) of used dialysis fluid. A first closed system is formed which includes the first chambers and a second closed system is formed which includes the second chambers. Two pressure gauges (P1 and P2) monitor the pressure in the two closed systems for a predetermined time. The monitoring provides indications relating to the filter integrity.

Abstract: A method of measuring oxygen-containing nitrogen components including nitrogen dioxide in exhaust gases of internal combustion engines, wherein an exhaust gas sample is taken from a removal point 10 at the exhaust gas pipe 1 and is guided to at least one measuring instrument by means of a removal line, wherein, for the purpose of measuring the oxygen-containing nitrogen components, there are provided a separate removal point 10 and a removal line 11 and that the exhaust gas sample for measuring the oxygen-containing nitrogen components is set to a temperature at which a reaction between the nitrogen dioxide and soot is low.

Abstract: A sample collection system and method for airborne biological agents is disclosed. The sample collection system comprises a sample collection module that collects particles in an air flow and transfer the collected particles into a sampling fluid, and a sample preparation module that is responsible for accepting the sampling fluid from the sample collection module, continuously aggregating or concentrating the collected particles in the sampling fluid during the sampling process and recycling a particle-lean sampling fluid back to the collection module.

Abstract: A gas membrane sampling device, particularly for geological investigations, comprises a membrane element including a liquid-tight, gas-permeable membrane, a filler material contained in and stabilizing the membrane element, and a connection cable being adapted for conducting gas out of the membrane element through a bore hole to a surface of the earth's. A gas sensor device for geological investigations, comprises the gas membrane sampling device and an analyzing device connected with the connection cable of the gas membrane sampling device. Furthermore, a method for the investigation of a geological formation is described.

Abstract: There is provided a method and device for remote sampling, preparation and optical interrogation of a sample using light scattering and light absorption methods. The portable device is a filtration-based device that removes interfering background particle material from the sample matrix by segregating or filtering the chosen analyte from the sample solution or matrix while allowing the interfering background particles to be pumped out of the device. The segregated analyte is then suspended in a diluent for analysis. The device is capable of calculating an initial concentration of the analyte, as well as diluting the analyte such that reliable optical measurements can be made. Suitable analytes include cells, microorganisms, bioparticles, pathogens and diseases. Sample matrixes include biological fluids such as blood and urine, as well as environmental samples including waste water.

Abstract: A probe for sampling a soil gas comprising a body having a cavity to which is connected an inlet and an outlet, and a gas permeable waterproof membrane wrapped around the body and sealing the cavity. The membrane allows the soil gas to flow across the membrane from the soil to the cavity. A method for measuring soil gas diffusivity comprising the step of circulating in a closed loop a carrier gas substantially at an atmospheric pressure through a diffusion gas sampling probe inserted in the soil and through a sensor used for the measurement of a concentration of at least a component of the soil gas.

Abstract: A method and system for sampling high vapor pressure substances is provided. In one embodiment, a sample is pre-concentrated by compression and condensation, water is removed by a condensing gas dryer, particulates are removed from the sample with an electrostatic precipitator; and the sample is shuttled through a sintered core at high vapor pressure so that molecules are condensed on the surface of the sintered core. In another embodiment, a system for sampling high vapor pressure substances includes a shuttle having a first piston and second piston for shuttling a sample through a sintered core at high vapor pressure and a condensing heat exchanger between the first piston and the second piston, the condensing heat exchanger including the sintered core.

Abstract: A novel multi-gas passive sampler is described, whereby different collection media are packed into one passive sampler to collect a variety of air pollutants (or groups of air pollutants) at the same time. By comparison with known commercially available passive samplers—in which only a single collection medium is used to collect a single air pollutant of or group of air pollutants—the MGPS is more cost effective, convenient to use and more environment-friendly.

Abstract: An assembly for insertion and retraction of probe or probe-like device which does not require a seal or packing gland, instead utilizing pressure equalization between pressurized process fluids and the housing containing a probe, so as to negate the use of a dynamic seal. The preferred embodiment of the present invention contemplates an inserting/retraction mechanism for raising and lowering the probe into and from the pressurized fluid, respectively. A housing having a valve is configured to allow fluid communication between the pressurized fluid source, and the interior of the housing assembly. A conduit engages the housing assembly, and is formed to slidingly receive the outer diameter of the probe therethrough, such that a sliding seal maintains a fluid seal between the outer wall of the probe and the inner wall of the conduit, as the probe is telescoped therethrough during insertion and retraction of the probe into/from the pressurized process.

Abstract: The present invention aims to detect breakage of a sieve in real-time and thus substantially reduce a cost increase of products caused by sieve breakage. The present invention also aims to reduce management cost of a sieve substantially. Multiple conductive bands 40 through 51 of a predetermined width, composed of multiple (for example, ten, in the structure shown in the figures) conductive weaving threads 24 and multiple (for example, ten) nonconductive weaving threads 23 and a certain number of nonconductive weaving threads 25, are formed in one area of the screen member 5. These conductive bands 40 through 51 of combined weave are formed parallel to the axial direction X at certain intervals D. Between each conductive band 40 through 51, nonconductive bands 52 through 62 plane-woven by using the nonconductive weaving threads 23 and the nonconductive weaving threads 25 are formed. A continuous conductive element 82 of a folded shape is formed, as shown in FIGS.

Abstract: In one form the present invention provides an apparatus in an airflow path before a particle detector, wherein the apparatus removes a substantially constant proportion of all sizes of airborne particles from the airflow over time. In an example the apparatus includes a flow splitting arrangement configured to divide a fluid flow into a plurality of sub-flows, the splitting arrangement 10 including means for defining a plurality of substantially identically dimensioned flow apertures configured to direct a portion of the fluid into a respective sub-flow.

Abstract: A detecting element and a detecting device having high sensitivity, and a production method thereof are provided. The detecting element for detecting a target substance in a sample includes a substrate and a metal structure. The substrate has a pore in which the thickness direction of the substrate corresponds to the depth direction of the pore and in which part of the substrate forming the pore constitutes part of the outer surface of the substrate. The metal structure exists in the pore, and has a ring shape.

Abstract: A three-stage dust sampler makes use of a porous foam as the impactor substrates. The sampler includes an annular inlet which conforms to ISO/CEN/ACGIH inhalable sampling criteria, two impactor stages to classify thoracic and respirable particles and a final filter to collect respirable particles after the impactors. For 100 ppi polymer foam substrates, and a flow rate of 3.2 lpm, the collection efficiency curves of the thoracic and respirable dust matches ISO/CEN/ACGIH criteria when the jet-to-plate distance is 1.0. The cut-off aerodynamic diameter is 9.6 and 4.0 ?m for the first and second impactor stages, respectively, and ?{square root over (stk50)} is 0.39 for both stages. The collection efficiencies for solid particles is equal to that for liquid particles, indicating that there is no solid particle bouncing from the foam substrates.

Abstract: A system (100) and method for detecting contaminants in parcels or other mailings (110). The contaminants, either genuine or hoax, are detected using the system (100) that includes a jogger (140) that shakes the parcels or other mailings (110). The system (100) further comprises a particle sampler (170) that analyzes the air flow created over the parcels (110) while the parcels are shaken. The system (100) and method preferable includes a parcel opening cutter (120) and a ram (148) for compressing during the shaking of the parcels. The air flow is sampled in order to detect whether or not a plurality of opened parcels is suspected of including contaminants such as biological threat material.

Abstract: The invention relates to a microfluidic device for detection of a substance in a sample fluid, and to a cartridge for performing a biological assay, containing such a device. The microfluidic device comprises two housing parts (52, 54) with a porous membrane (50) there between. Each housing part has recesses, or channel parts, (56-1, 56-2, 56-n, 58-1, 58-2, 58-n) that are connected via a recess of the opposite housing part, and through the membrane (50), such that an unbranched channel is defined for the sample fluid. At one or more of the positions where the channel crosses the membrane (50), a spot (48-1, 48-2, 48-n) with an immobilized indicator substance is present, to which a target substance in the sample fluid may bind. An advantage of the present device is that in principle all of the sample fluid passes each spot. Hence there is no need to recirculate and/or mix the sample fluid, as is the case in devices with parallel flow-through paths for the fluid.

Abstract: A gas separation system for extraction of gas from pressurized fluid has a gas sampling interface and gas circulation tubing to pass sampled gas to a gas sensor to determine the character or a property of the gas. The gas sampling interface includes a semi-permeable membrane in the form of tubing having an inner core volume with an internal support that provides multiple supporting surfaces to prevent collapse of the tubing wall against external pressure and provides interstitial spaces for the flow of gas. Internal supports may include a coil of spring-like configuration fitted coaxially within the tubing; or multiple filaments that form a longitudinal bundle within the core of the tubing, or both. An outer tubular conduit surrounding the semi-permeable membrane tubing provides a flow path for the external fluid to increase the rate of diffusion of dissolved gases through the semi-permeable membrane.

Abstract: The invention relates to a drainage device for a filter unit for microbiological testing of liquids, said drainage device including a mechanical support (10), which is adapted to receive a filter unit (16), and an suction pump (22) connected to said mechanical support to aspirate a liquid substance contained in said filter unit. The device comprises: a weight sensor (18) on which said mechanical support is mounted; a user interface (26) for entering data relating to drainage and/or said liquid substance; and a control unit (24) connected to said suction pump (22), the weight sensor (18) and said user interface (26), said control unit (24) being adapted to determine, from said data, at least a first weight corresponding to a first representative signal; and, when said weight sensor (18) supplies a signal corresponding to said first signal, said control unit (24) starts operation of said suction pump (22) so as to aspirate said liquid substance contained in said filter unit (16).

Abstract: A method and device for sampling pore water, including an elongated tubular outer body having a grid framework forming multiple perforations throughout the entire outer body. The grid framework surrounding the perforations has raised and beveled sides. An elongated, perforated tubular inner body is contained within the outer body. The inner body has a diameter less than a diameter of the outer body, which forms a cavity between the inner body and the outer body. The cavity is filled with an inert granular filler material. A first outer cap and a second outer cap cover respective ends of the outer body. A coupling is placed in fluid communication with the inner body and protrudes through the first outer cap. A tube is attached to the coupling protruding through the first outer cap to transfer a water sample to a sample collection site.

Abstract: A system includes a device for collecting gas-borne matter therein and a humectant provided external to the device for maintaining a desired humidity level for collected matter in the device.

Abstract: A gas sampling system having a storage chamber configured to store a gas; a water-impermeable, gas-permeable surface; and an isolating system. The isolating system is configured to have a first and a second position, and the storage chamber is in fluid communication with the water-impermeable, gas-permeable surface when the isolating system is in a first position. The storage chamber is not in fluid communication with the water-impermeable, gas-permeable surface when the isolating system is in the second position. The gas sampling system also has a gas displacement system configured to displace the gas from the storage chamber.

Abstract: A gas transmitter having selective gas permeable surfaces includes a support disc that is provided with a plurality of through openings. The support disc is made from a semiconductor material. The transmitter further includes a membrane covering the openings in the support disc thereby forming the selective gas permeable surfaces and further controls the temperature of the membrane.

Abstract: A dilution apparatus for diluting a gas sample. The apparatus includes a sample gas conduit having a sample gas inlet end and a diluted sample gas outlet end, and a sample gas flow restricting orifice disposed proximate the sample gas inlet end connected with the sample gas conduit and providing fluid communication between the exterior and the interior of the sample gas conduit. A diluted sample gas conduit is provided within the sample gas conduit having a mixing end with a mixing space inlet opening disposed proximate the sample gas inlet end, thereby forming an annular space between the sample gas conduit and the diluted sample gas conduit. The mixing end of the diluted sample gas conduit is disposed at a distance from the sample gas flow restricting orifice. A dilution gas source connected with the sample gas inlet end of the sample gas conduit is provided for introducing a dilution gas into the annular space, and a filter is provided for filtering the sample gas.

Abstract: A personal dust sampler for collecting airborne inhalable dust. A sampler body provides vertical elutriation by comprising an entry aperture at a distal end exposed to ambient air and having an inner diameter for air intake, and an air exit at a proximal end connected to a pump for drawing air through and along a longitudinal axis of the sampler body to filter media disposed therein for dust capture. A distance along the longitudinal axis between the filter media and the entry aperture defines an air intake length, where the length is greater than the inner diameter of the entry aperture. The air intake length could also be two, three or four or more times greater than the entry aperture inner diameter. The longitudinal axis could be arranged substantially vertically during use, so the entry aperture lies in a horizontal plane, simulating nose orientation and breathing through the nose.