Filter life indicating medium and holder

Abstract

This application relates to filter life indicating media and holders. A media sample holder includes a substrate and a plurality of retention assemblies configured to allow attachment of the substrate to an attachment adapter, the plurality of retention assemblies including a retention tab and an opposing flexible release lever arm. The media sample holder can attach a media sample on or near a filter. The media sample held in the media sample holder can have a removal efficiency curve that is different from a removal efficiency curve of the filter. The media sample can be placed at or near the filter for a period of time and then tested to determine a status and / or life of the filter based on a relationship between a remaining life, exposure, or removal efficiency of the filter and an exposure or removal efficiency of the tested media sample.

Description

Technical Field

[0001] The present invention relates to a filter life indicator medium sample, a holder for such a medium sample, and a method for determining the filter life based on the medium sample. Background Technology

[0002] Filter life testing typically involves destructive testing of pieces cut from the filter or even testing the entire filter itself once it has been taken out of service. This limits the frequency of testing. Furthermore, depending on when the pieces are removed, test results may not reflect the filter's lifespan, or, if testing the entire filter, results may be too late to guide decisions regarding filter replacement. Infrequent testing can lead to premature filter disposal or undesirable responses to filter performance falling below desired levels. Summary of the Invention

[0003] The present invention relates to a filter life indicator medium sample, a holder for such a medium sample, and a method for determining the filter life based on the medium sample.

[0004] By using a sample of the medium held close to the filter, the medium can be used to evaluate the filter's exposure and effectiveness without removing portions of the filter for testing. The sample can be replaced and tested more frequently compared to other filter tests. By using a medium with a known removal efficiency that differs from the filter's removal efficiency, the medium can provide an understanding of the filter's exposure and its changes in removal efficiency, even over a finite lifespan.

[0005] Filters are often located in hard-to-reach areas. A quick-release retaining tab that can be operated with one hand allows users to place or remove the media sample holder even in confined or otherwise difficult locations within the filter assembly, and the media sample can be easily replaced or removed from the holder once it has been removed.

[0006] In one embodiment, a media sample holder includes a substrate. The substrate includes: a substrate body having a recess configured to receive a media sample; a first opening configured to expose a first portion of the media sample; and a plurality of holding assemblies configured to hold the media sample holder to an attachment adapter. The holding assemblies include holding tabs extending from the substrate body and release lever arms opposing the holding tabs. The release lever arms are flexible, extend from the substrate body toward the holding tabs, and include a holding surface at an end toward the holding tabs.

[0007] In one embodiment, the media sample holder further includes: a cover having a second opening configured to expose a second portion of the media sample; and a hinge engaging the substrate to the cover. The substrate and the cover are configured to form a snap-fit ​​closure.

[0008] In one embodiment, the media sample holder further includes the attachment adapter, which is configured to engage with a filter. In one embodiment, the attachment adapter includes a comb configured to mechanically engage pleats in the filter. In one embodiment, the attachment adapter includes a flat surface on the side opposite to the plurality of retaining assemblies configured to engage with the attachment adapter.

[0009] In one embodiment, each of the release lever arms further includes a ramp portion configured to release an engagement feature located between the release lever arm and the retaining tab.

[0010] In one embodiment, the substrate comprises a melt-processable polymer.

[0011] In one embodiment, the retaining surface includes a ramp portion angled relative to the opposite surface of the retaining tab.

[0012] In one embodiment, the medium sample holder further comprises a medium sample located within the recess. The medium sample is configured to adsorb one or more contaminants selected from acids, bases, and volatile organic compounds.

[0013] In one embodiment, the media sample has a known removal efficiency profile for the one or more contaminants, which is different from the removal efficiency profile of the filter to which the media sample holder is configured for use.

[0014] In one embodiment, the medium sample comprises an adsorption medium and a thin film surrounding the adsorption medium, wherein the thin film is sealed at the periphery of the medium sample.

[0015] In one embodiment, the medium sample holder further includes an inlet configured to direct flow toward the second opening, the inlet having an inlet opening having an area larger than that of the second opening.

[0016] In one embodiment, a method for evaluating a filter includes: determining the removal efficiency of a media sample, wherein the media sample has been attached to the filter for a predetermined time period; and determining the removal efficiency of the filter based on the removal efficiency of the media sample and the predetermined time period. The removal efficiency curve of the media sample differs from the removal efficiency curve of the filter.

[0017] In one embodiment, the method further includes attaching the media sample to the filter using a media sample holder for the predetermined amount of time. The media sample holder includes: a base including a base body having a recess configured to receive the media sample and an opening configured to expose a first portion of the media sample; and a plurality of holding assemblies. The holding assemblies include holding tabs extending from the base body and release lever arms opposing the holding tabs, wherein the release lever arms are flexible, extend from the base body toward the holding tabs, and include a holding surface. The media sample holder further includes: a cover having an opening configured to expose a second portion of the media sample; and a hinge engaging the base to the cover. The base and the cover are configured to form a snap-fit ​​closure.

[0018] In one embodiment, attaching the media sample holder to the filter includes a filter comb that engages the plurality of retaining assemblies with the filter.

[0019] In one embodiment, attaching the media sample to the filter includes engaging the plurality of retaining assemblies with an attachment adapter fixed to the filter.

[0020] In one embodiment, the attachment adapter is secured to the filter by tape.

[0021] In one embodiment, the method further includes removing the media sample holder from the filter by bending the release lever arm.

[0022] In one embodiment, the media sample holder is attached to the filter on the upstream side of the filter.

[0023] In one embodiment, the media sample is attached to the filter such that the media sample is parallel to the flow passing through the filter.

[0024] In one embodiment, the media sample is attached to the filter such that the media sample is perpendicular to the flow passing through the filter.

[0025] In one embodiment, the media sample is attached to the filter such that the media sample is at an angle relative to the flow passing through the filter.

[0026] In one embodiment, a media sample holder includes a substrate. The substrate includes a substrate body comprising a recess configured to receive a media sample and a first opening configured to expose a first portion of the media sample. The substrate includes a plurality of retaining structures configured to retain the media sample holder to an attachment adapter. Each retaining structure includes a fixed wall, a channel bottom, and a cam surface. The cam surface is mounted on a flexible arm. The cam surface is opposite the fixed wall. The cam surface, the channel bottom, and the fixed wall are configured to receive the attachment adapter when the flexible arm is in a flexed position.

[0027] In one embodiment, the media sample holder further includes: a cover having a second opening configured to expose a second portion of the media sample; and a hinge engaging the substrate to the cover. The substrate and the cover are configured to form a snap-fit ​​closure.

[0028] In one embodiment, the media sample holder further includes the attachment adapter, which is configured to engage with the filter.

[0029] In one embodiment, the attachment adapter includes a comb configured to mechanically engage the pleats in the filter.

[0030] In one embodiment, the attachment adapter includes a frame having a generally triangular shape and an extension, the frame and the extension providing a flat outer surface, the extension having a thickness such that the retaining structure can accommodate the extension.

[0031] In one embodiment, the substrate comprises a melt-processable polymer.

[0032] In one embodiment, the media sample holder further comprises a media sample at least partially located within the recess, the media sample being configured to adsorb one or more contaminants selected from acids, bases, and volatile organic compounds. In one embodiment, the media sample comprises an adsorption medium and a membrane surrounding the adsorption medium, wherein the membrane is sealed at the periphery of the media sample. In one embodiment, the media sample has a known removal efficiency profile for the one or more contaminants, the known removal efficiency profile being different from the removal efficiency profile of a filter to which the media sample holder is configured for use.

[0033] In one embodiment, the medium sample holder further includes an inlet configured to direct flow toward the second opening, the inlet having an inlet opening having an area larger than that of the second opening.

[0034] In one embodiment, a method for evaluating a filter includes determining the removal efficiency of a media sample. The media sample has been attached to the filter for a predetermined amount of time. The method further includes determining the removal efficiency of the filter based on the removal efficiency of the media sample and the predetermined amount of time. The removal efficiency curve of the media sample differs from the removal efficiency curve of the filter.

[0035] In one embodiment, the method uses a media sample holder to attach the media sample to the filter for a predetermined amount of time. The media sample holder includes a substrate. The substrate includes a substrate body that includes a recess configured to receive the media sample and a first opening configured to expose a first portion of the media sample. The substrate includes a plurality of holding structures configured to hold the media sample holder to an attachment adapter. The holding structures include a fixed wall, a channel bottom, and a cam surface. The cam surface is mounted on a flexible arm, wherein the cam surface faces the fixed wall, and the cam surface, the channel bottom, and the fixed wall are configured to receive the attachment adapter when the flexible arm is in a flexed position. The media sample holder further includes: a cover that includes an opening configured to expose a second portion of the media sample; and a hinge that engages the substrate to the cover. The substrate and the cover are configured to form a snap-fit ​​closure.

[0036] In one embodiment, attaching the media sample holder to the filter includes engaging the plurality of retaining structures with the attachment adapter, wherein the attachment adapter is a filter comb.

[0037] In one embodiment, attaching the media sample to the filter includes engaging the plurality of retaining structures and an attachment adapter, wherein the attachment adapter includes a frame having a generally triangular shape and an extension, the frame and the extension providing a flat outer surface, and the extension having a thickness such that the retaining structures can accommodate the extension.

[0038] In one embodiment, the attachment adapter is secured to the filter by tape. In another embodiment, the attachment adapter is secured near the filter.

[0039] In one embodiment, the method further includes removing the media sample holder from the filter by pulling the media sample holder away from the attachment adapter.

[0040] In one embodiment, the media sample holder is attached to the filter upstream of the filter. In one embodiment, the media sample is attached to the filter such that the plane of the media sample is parallel to the flow through the filter. In one embodiment, the media sample is attached to the filter such that the plane of the media sample is perpendicular to the flow through the filter. Attached Figure Description

[0041] Figure 1 A perspective view showing a media sample holder attached to an attachment adapter according to one embodiment.

[0042] Figures 2A to 2C A side view showing the attachment of a media sample holder to an attachment adapter according to one embodiment.

[0043] Figure 3 A perspective view showing a media sample holder and an attachment adapter according to one embodiment.

[0044] Figure 4A This illustration shows the arrangement of a media sample and a filter according to one embodiment.

[0045] Figure 4B A media sample and another arrangement of filters according to another embodiment are shown.

[0046] Figure 4C A media sample and another arrangement of the filter according to yet another embodiment are shown.

[0047] Figure 5 A flowchart illustrating the methods used to evaluate filters.

[0048] Figure 6 A graph showing the removal efficiency curves of the filter and the media sample used in evaluating the filter.

[0049] Figure 7 A perspective view showing a portion of a media sample holder according to one embodiment.

[0050] Figure 8 A perspective view of a media sample holder attached to a filter according to one embodiment is shown.

[0051] Figure 9 A side view of a media sample holder attached to a filter according to one embodiment is shown.

[0052] Figure 10 A perspective view of an attachment adapter for a media holder according to one embodiment is shown. Detailed Implementation

[0053] The present invention relates to a filter life indicator medium sample, a holder for such a medium sample, and a method for determining the filter life based on the medium sample.

[0054] Figure 1 A perspective view of a media sample holder according to one embodiment is shown. The media sample holder 100 includes a cover 102 with a cover opening 104. The media sample holder 100 further includes a sample holder body 106. The cover 102 is engaged to the sample holder body 106 via a hinge 108. The cover 102 includes an aperture 110, and the media sample holder body 106 includes a protrusion 112 configured to form a snap-fit ​​engagement with the aperture 110. The media sample holder body 106 further includes retaining assemblies 114. Each of the retaining assemblies 114 includes a retaining tab 116 and a release lever arm 118. The sample holder body 106 also includes a recess 120 and a body opening 122. The media sample holder 100 can accommodate a media sample 124. The media sample holder 100 is engaged to an attachment adapter 126. Figure 1 The attachment adapter 126 shown is a comb that includes teeth 128 extending from a shaft 130. The shaft 130 includes a plurality of meshing surfaces 132 disposed between the teeth 128.

[0055] The cover 102 forms part of the media sample holder 100. When closed, the cover 102 partially encloses a recess 120 of the sample holder body 106. By enclosing the recess, the cover 102 secures the media sample 124 within the sample holder 100. The cover 102 includes a cover opening 104. The cover opening 104 is an orifice formed in the cover 102 configured to allow contact between the media sample 124 held in the media sample holder 100 and the surrounding environment (e.g., the interior of a conduit) at or near a filter. In one embodiment, the cover opening 104 is circular. In one embodiment, the cover 102 has a chamfer. In one embodiment, the inner perimeter of the cover opening 104 is smaller than the perimeter of the media sample 124, such that the media sample 124 can be held by the cover 102 when the cover 102 is closed. In one embodiment, the cover opening 104 has a generally circular shape. In one embodiment, an inlet may extend from the cover opening 104, such as... Figure 4A As shown in the text and described below.

[0056] The sample holder body 106 forms the main body of the medium sample holder 100. The sample holder body 106 may be formed of a polymer material. In one embodiment, the sample holder body 106 comprises a melt-processable polymer material.

[0057] Hinge 108 engages cover 102 to sample holder body 106. Hinge 108 may include a pin engaging a portion of cover 102 to a portion of sample holder body 106. Hinge 108 allows cover 102 to rotate relative to sample holder body 106.

[0058] The cover 102 can be fastened to the sample holder body 106 by, for example, a snap-fit ​​engagement. The snap-fit ​​engagement can be a snap-fit ​​orifice 110 provided on the cover 102 and a protrusion 112 extending from the sample holder body 106 at a location corresponding to the snap-fit ​​orifice 110 on the cover 102. The protrusion 112 may include a portion configured to engage or fasten onto the snap-fit ​​orifice 110 to provide a snap-fit ​​engagement. The protrusion 112 may be flexible, such that it can engage the orifice 110, but can be bent out of this engagement to allow the cover 102 to be opened from the sample holder body 106 around the hinge 108.

[0059] A retaining assembly 114 is disposed on the sample body holder 106. The retaining assembly is used to secure the media sample holder 100 to the attachment adapter 126. Each retaining assembly includes a retaining tab 116 and a corresponding release lever arm 118. In one embodiment, the media sample holder 100 includes two retaining assemblies 114 disposed on opposite sides of the media sample holder. In one embodiment, the media sample holder has a generally square or rectangular shape, wherein one pair of opposite sides includes a hinge 108 and a snap-fit ​​including a snap-fit ​​aperture 110 and a protrusion 112, and a retaining assembly 114 is disposed on the other pair of opposite sides.

[0060] The retaining tab 116 protrudes from the sample holder body 106. The retaining tab 116 is sized and shaped to engage with the engagement surface 132 of the attachment adapter 126.

[0061] A release lever arm 118 extends from the sample holder body 106 toward the retaining tab 116. The release lever arm 118 is flexible, allowing it to bend toward the cover 102. The release lever arm 118 may include one or more protrusions, textures, overmolded polymer material, or any other suitable gripping surface to facilitate operator gripping. The release lever arm 118 provides a surface that is positioned opposite one end of the retaining tab 116 when in its unbent state. The surface of the release lever arm 118 opposite the retaining tab 116 may contact the retaining tab 116 or be spaced apart from the retaining tab 116 by a distance too small to allow a portion of the attachment adapter 126 to pass through. When the release lever arm 118 is in its unbent state, the spacing between the release lever arm 118 and the retaining tab 116 allows the attachment adapter 126 to be held in the position where the engagement surface 132 contacts the retaining tab 116. When folded toward the cover 102, the surface of the release lever arm 118 is moved such that the engaging surface 132 can disengage from the retaining tab 116, allowing the media sample holder 100 to be removed from the attachment adapter 126. In one embodiment, the cover 102 may include a cutout positioned and positioned to facilitate the folding of the release lever arm.

[0062] Recess 120 is a recess formed in the sample holder body 106. Recess 120 is formed in the surface facing the cover 102 when the cover 102 is closed to the sample holder body 106. Recess 120 may be sized to accommodate the media sample 124. Recess 120 may communicate with both the cover opening 104 and the body opening 122. Recess 120 may have a perimeter larger than the cover opening 104 or the body opening 122. In one embodiment, recess 120 is generally circular in shape.

[0063] The main opening 122 is an opening located between the recess 120 and the bottom of the sample holder body 106. The main opening 122 exposes the media sample 124 to a side opposite to the side exposed through the cap opening 104 when the media sample 124 is placed in the recess 120. This exposure allows the media sample 124 to adsorb contaminants from the surrounding environment. The main opening 122 may be chamfered or tapered as it extends from the recess 120 toward the bottom of the sample holder body 106. In one embodiment, the main opening 122 is generally circular in shape.

[0064] The medium sample 124 is a sample containing an adsorbent medium that can be held by the sample medium holder 100. The medium sample 124 may contain an adsorbent targeting one or more contaminants. As a non-limiting example, the one or more contaminants may include acids, bases, volatile organic compounds, and ionic contaminants. Non-limiting examples of contaminants include acetic acid, sulfuric acid, toluene, ammonia, etc. The medium sample 124 may comprise a porous membrane surrounding the adsorbent medium. The membrane can be formed, for example, by sealing the periphery of two membranes using ultrasonic welding. In one embodiment, the medium sample 124 has a generally planar shape. In another embodiment, the medium sample 124 has a generally disk-shaped shape. The medium sample 124 may be sized to fit within the recess 120 but large enough to prevent it from passing through the cap opening 104 or the body opening 122. The medium sample 124 may be held between the cap 102 and the sample holder body 106 when the cap 102 is closed, and may be removed from the sample medium holder 100 when the cap 102 is opened. In one embodiment, the media sample 124 has a predetermined removal efficiency and / or a predetermined relationship between the removal efficiency and exposure to contaminants. In one embodiment, the predetermined removal efficiency is less than the removal efficiency of a filter to which the sample media holder 100 can be attached. In one embodiment, the predetermined relationship between the removal efficiency and exposure is defined by a curve that covers a smaller area and has a lower height compared to a curve showing the relationship between the removal efficiency of a filter to which the sample media holder 100 can be attached and exposure. The media sample may comprise any adsorbent medium, including, as a non-limiting example, activated carbon, ion exchange resins or other ion exchangers, treated carbon, engineered carbon, carbon on resin, reagents fixed to fibers, or any other suitable adsorbent medium capable of adsorbing one or more contaminants.

[0065] The attachment adapter 126 is an adapter that allows attachment and removal of the media sample holder 100. The attachment adapter 126 may be secured to or near the filter where the media sample 124 is to be evaluated. In one embodiment, the attachment adapter 126 is directly secured to the filter. In one embodiment, the attachment adapter 126 is secured near the filter, for example, on the wall of a conduit or fluid passage containing the filter. In one embodiment, the attachment adapter 126 may be an integral feature of the filter. In one embodiment, the attachment adapter 126 is a comb that engages with pleats formed in the filter, such as... Figure 1 As shown in the image.

[0066] The attached adapter 126 is a comb. Figure 1In the embodiment shown, the comb includes teeth 128 extending from a shaft 130. Each of the teeth 128 is shaped to extend between the pleats of the filter to maintain the shape and separation of the pleats. The shaft 130 is a support along which the teeth 128 are distributed. There are gaps between each of the teeth 128. At these gaps, the shaft includes an engagement surface 132. The engagement surface 132 has a shape capable of engaging the retaining tab 116 on a surface facing the cover 102. The retaining tab 116 may be shaped to correspond to the engagement surface 132, for example, having a curvature matching the curvature of the engagement surface or such corners matching the squared-off corners in the engagement surface 132. The media sample holder 100 is sized such that the retaining assemblies are spaced apart by a distance that is the distance between the engagement surfaces disposed on the attachment adapter 126.

[0067] Figures 2A to 2C A side view showing the attachment of a media sample holder to an attachment adapter according to one embodiment is shown. The media sample holder 200 includes a retaining tab 202 and a release lever arm 204. The release lever arm 204 includes a head 206, which includes a ramp portion 208 at an end 210. The release lever arm 204 further includes a flexible arm 212 that engages the head 206 to the media sample holder 200. The attachment adapter 214 includes a shaft 216. The shaft 216 has a leading edge 218 and an engagement surface 220 opposite to the leading edge 218.

[0068] Figure 2A The demonstration begins with attaching the media sample holder 200 to the attachment adapter 214. (As shown...) Figure 2A As shown, the leading edge 218 of the shaft 216 of the attachment adapter 214 contacts the head 206 of the release lever arm 204. In one embodiment, the leading edge 218 of the shaft 216 may alternatively be an engagement protrusion (e.g., Figure 3 One end of the engaging protrusion 310 shown in the diagram and described below. The leading edge 218 presses firmly against the head 206 to bend the flexible arm 212, as shown in the diagram. Figure 2B In the middle. The leading edge 218 pressing against the head 206 can be the result of pressing the media sample holder 200 toward the attachment adapter 214, which can be fixed near the filter or on the filter.

[0069] Figure 2BThe demonstration shows that when the shaft 216 is pressed against the head 206, the lever arm 204 bends at the flexible arm 212. The bending of the flexible arm 212 causes the head 206 to move, allowing the engagement surface 220 on the shaft 216 to pass through the retaining tab 202. Once the engagement surface 220 has moved past the retaining tab 202, the media sample holder 200 is moved so that the retaining tab 202 engages the engagement surface 220, as shown. Figure 2C As shown in the image.

[0070] Figure 2C The retaining tab 202 of the media sample holder 200 engages with the engagement surface 220 of the attachment adapter 214. The end 210 of the release lever arm 204 is spaced apart from the opposite side of the media sample holder 200, such that a shaft 216 can be accommodated between the ramp surface 208 of the release lever arm 204 and the side surface 222 of the body of the media sample holder 200. With the shaft 216 within this space, the flexible arm 212 of the release lever arm 204 can move back to its unbent position. When the flexible arm 212 is in the unbent position, the ramp surface 208 approaches or contacts the shaft 216, such that the shaft 216 is held in the position where the retaining tab 202 engages with the engagement surface 220 of the attachment adapter 214. Therefore, the media sample holder 200 is held to the attachment adapter 214. The ramp surface 208 prevents or reduces the possibility of the shaft 216 rotating and disengaging from the retaining tab 202.

[0071] The media sample holder 200 can be removed from the attachment adapter 214 by the following steps: Figure 2C The state shown in the text Figure 2B The steps shown in the diagram are reversed: the flexible arm 212 is manually bent to release the attachment adapter 214 from the retaining tab 202, allowing the removal of the media sample holder 200.

[0072] Figure 3 A perspective view of a media sample holder and an attachment adapter according to one embodiment is shown. Figure 3 In the embodiment shown, the medium sample holder 300 is attached to the attachment adapter 302. Figure 3 The attachment adapter 302 shown includes a body 304. The body 304 has a side 306 facing the sample holder and an opposite side 308. The body 304 further includes one or more engaging protrusions 310. Each of the engaging protrusions 310 includes an aperture 312 configured to engage with one of the retaining tabs 314 of the media sample holder 300. The media sample holder 300 further includes a release lever arm 316 that engages with the retaining tab 314 to fasten the retaining tab 314 to the aperture 312 in the engaging protrusion 310.

[0073] The medium sample holder 300 is, for example, Figure 1 The media sample holder 100 shown and described above is a media sample holder. The media sample holder 300 includes a space for receiving a media sample to, for example, hold the media sample between the body and a cover connected by a hinge. The media sample holder 300 includes a holding tab 314 and a release lever arm 316 that allow attachment to and removal from the attachment adapter 302.

[0074] The attachment adapter 302 is an accessory configured to engage at or near a filter to allow removable attachment of the media sample holder 300. The attachment adapter 302 includes a body 304. The body 304 has a side 306 facing the media sample holder and an opposite side 308. The side 306 facing the media sample holder includes one or more engaging protrusions extending from it. The side 306 facing the media sample holder is otherwise configured to avoid interfering with the media sample holder 300, for example, by being a flat surface. The opposite side 308 allows the attachment adapter 302 to be secured to a filter or a structure near the filter, such as the wall of a conduit. The opposite side may allow this securing, for example, by providing a flat surface for tape or by including mounting features such as tabs, slots, or flanges, or an interface for fasteners such as screw holes. In one embodiment, the body 304 of the attachment adapter 302 may include one or more crossbeams connecting the side 306 facing the media sample holder to the opposite side 308, for example… Figure 4C As shown in the diagram and described below. In one embodiment, the side 306 facing the media sample holder may be angled relative to the opposite side 308, for example, such that the media sample holder 300 attached to the attachment adapter 302 is angled relative to a portion engaged with the opposite side 308, for example... Figure 4C As shown in the text and described below.

[0075] An engagement protrusion 310 extends from the side 306 facing the media sample holder. The engagement protrusion includes an aperture 312 shaped and sized to receive a retaining tab 314 of the media sample holder 300. The aperture 312 extends through the engagement protrusion 310. The engagement protrusion 310 extends sufficiently from the side 306 of the body 304 facing the media sample holder to allow the end of the engagement protrusion to bend the release lever arm 316 and engage the aperture 312 with the retaining tab 314 when the media sample holder 300 is pressed against the attachment adapter 302.

[0076] The retaining tab 314 is a tab extending from the body of the medium sample holder 300. The retaining tab 314 is shaped and sized to engage with an aperture 312 formed in the attachment adapter 302. The retaining tab 314 may be as described above and Figure 1The retaining protrusion 116 shown in the figure.

[0077] A release lever arm 316 extends from the body of the medium sample holder 300 toward the retaining tab 314 and presents a surface opposite to the retaining tab. The release lever arm 316 is sized such that an engagement protrusion 310 can be accommodated between one end of the release lever arm 316 and the surface of the retaining tab 314 from which it protrudes, such that the release lever arm 316 retains the engagement protrusion 310 in the engagement orifice 312 of the retaining tab 314. The release lever arm is flexible, such that it is in a retained position when not bent and can be bent out of the retained position. The release lever arm 316 may be as described above and Figure 1 The release lever arm 118 shown in the figure. When bent out of the holding position, the release lever arm 316 allows the insertion of the engagement protrusion 310 to present an orifice 312 to the holding tab 314 or allows the orifice 312 to disengage from the holding tab 314.

[0078] Figure 4A This illustration shows a media sample and filter arrangement according to one embodiment. Figure 4A In the middle, the conduit 400 contains a filter 402. The media sample holder 404 (e.g.) Figures 1 to 3 The media sample holder 404 of the embodiments shown and described herein is attached to the attachment adapter 406. The media sample holder 404 contains a media sample (not shown), such as those described above. Figure 1 The medium sample 124 shown in the image. Figure 4A In the embodiment shown, the media sample holder 404 holds the media sample when attached to the attachment adapter 406 such that the plane of the media sample is perpendicular to the flow direction D. In this vertical arrangement, the exposure of the media sample is affected by both the diffusion of contaminants and the flow velocity along the flow direction D. The media sample is held in a position upstream of the filter 402 relative to the flow direction D. Figure 4A In the embodiment shown, the medium sample holder 404 further includes an inlet 410. The inlet 410 includes a leading edge 412 extending toward the flow direction D and a trailing edge 414 located at the medium sample. The leading edge 412 of the inlet 410 may have an area larger than the trailing edge 414 and the area of ​​the medium sample. The inlet 410 allows the flow to be concentrated onto the medium sample.

[0079] Figure 4B A media sample and another arrangement of a filter according to one embodiment are shown. Figure 4B In the middle, the conduit 400 contains a filter 402. The media sample holder 404 (e.g.) Figures 1 to 3The media sample holder 404 of the embodiments shown and described herein is attached to the attachment adapter 420. The media sample holder 404 contains a media sample (not shown), such as those described above. Figure 1 The medium sample 124 shown in the image. Figure 4B In the embodiment shown, the media sample holder 404 holds the media sample when attached to the attachment adapter 420 such that the plane of the media sample is parallel to the flow direction D. Figure 4B In the embodiment shown, the attachment adapter 420 includes a protrusion 422 extending parallel to the flow direction D. The protrusion 422 extends from the base 424 that engages with the filter 402. In this parallel arrangement, the exposure of the media sample is primarily affected by the diffusion of contaminants, and little or no by the flow velocity along the flow direction D. The media sample is held upstream of the filter 402 relative to the flow direction D.

[0080] Figure 4C A media sample and another arrangement of a filter according to one embodiment are shown. Figure 4C In the middle, the conduit 400 contains a filter 402. The media sample holder 404 (e.g.) Figures 1 to 3 The media sample holder of the embodiments shown and described herein is attached to the attachment adapter 430. Figure 4C In the embodiment shown, the attachment adapter 430 engages with the wall of the conduit 400, thereby securing the media sample holder 404 near the filter 402. The media sample holder 404 contains a media sample (not shown), such as those described above. Figure 1 The medium sample 124 shown in the image. Figure 4C In the embodiment shown, the media sample holder 404 holds the media sample when attached to the attachment adapter 430 such that the plane of the media sample is angled relative to the flow direction D. Figure 4C In the embodiment shown, the attachment adapter 430 includes a plurality of crossbeams 432 extending to a base 434 connected to the wall of the conduit 400. The crossbeams 432 extend from the base 434 to the interface 436 to which the media sample holder 404 is attached. In this angled arrangement, the exposure of the media sample can be a result of both contaminant diffusion and flow velocity along the flow direction D, where the relative impact of each effect is based on a specific angle between the media sample and the flow direction D. The media sample is held in a position upstream of the filter 402 relative to the flow direction D.

[0081] Figure 5A flowchart illustrating a method for evaluating a filter is provided. In method 500, the removal efficiency of a media sample is determined at 502. Based on the removal efficiency of the media sample, the removal efficiency of the filter is determined 504. Optionally, the method further includes attaching a media sample to the filter 506 and subsequently removing the media sample from the filter 508.

[0082] The removal efficiency of the media sample is determined at 502. The removal efficiency of the media sample can be determined by filter effectiveness testing methods (e.g., destructive testing and analysis of the media contained therein). As a non-limiting example, examples of testing the media sample at 502 may include a remaining lifetime test or a solvent test. In the example of a remaining lifetime test, the media sample is challenged with a contaminant of known concentration for a known period of time or until it affects the filter removal efficiency. In the example of a solvent test, the media sample is added to a solvent that dissolves the contaminant trapped by the filter, and the resulting solution is tested to identify and quantify compounds, for example, using chromatography. In one embodiment, a solvent test as described above may be performed on a media sample or a portion of a media sample, wherein the solvent test is used to identify contaminants, which are then challenged from another portion or another media sample at the same location during the remaining lifetime test described above.

[0083] The media sample analyzed at 502 to determine removal efficiency is a media sample that has been held at or near the filter. The media sample may be an adsorbent medium capable of adsorbing one or more contaminants. The one or more contaminants may include, for example, acids, alkalis, volatile organic compounds, or any other suitable chemicals of interest that can be trapped or adsorbed by the medium. The media sample is held at or near the filter in the path of the gas or liquid flow to or through the filter. The media sample may be held within a conduit containing the filter. The media sample may be attached to the filter itself, for example, on the upstream side of the filter. The media sample may be held at or near the filter for a known period of time. In one embodiment, the media sample is held at or near the filter for a predetermined amount of time, such as one month or three months. The amount of time the media sample is held at or near the filter may be a period of time based on the expected lifespan of the filter. For example, a short-life filter (ten days to two weeks) may have a predetermined amount of time between twelve hours and twenty-four hours. As a non-limiting example, a longer-life filter may have a predetermined time from one month to one year. The media sample has a known relationship between removal efficiency and exposure. This known relationship may be predetermined based on the load of the media sample containing the adsorbent medium. This known relationship may differ from the relationship between filter exposure and removal efficiency for which the removal efficiency determined at 504 is targeted. In one embodiment, the media sample may be held at or near the filter until an event such as overflow or other such event that has a potentially significant impact on filter effectiveness occurs. In one embodiment, two or more media samples may be held at or near the filter. In this embodiment, one or more of the media samples may be attached for a predetermined time period, and another or more of the media samples may only be attached to be removed and tested in the event that has a potential impact on filter effectiveness. In one embodiment, two or more media samples may be attached at or near different locations at or near the filter, and each of those samples may be tested. Media samples attached at different locations can be used to determine spatial effects, such as the effect of non-uniform flow on effective filter lifetime or removal efficiency.

[0084] In one embodiment, the media sample is attached to a media sample holder (e.g., a media sample holder) of the attachment adapter. Figures 1 to 4C The media sample holder and the attached adapter shown and described above are held in or near the filter.

[0085] At point 504, the removal efficiency of the filter is determined based on the removal efficiency of the media sample determined at point 502. This removal efficiency can be determined at point 504, for example, by using the removal efficiency of the media sample to determine the filter's exposure during the time period the media sample is held at or near the filter. The exposure of the media sample can be assessed based on its removal efficiency, and the exposure of the media sample can be used to estimate or determine the filter's own exposure due to the common environment over a known time period.

[0086] Optionally, a media sample can be attached to the filter at point 506. Attaching the media sample to the filter may include placing the media sample in a media sample holder and securing the media sample holder to the filter. The media sample holder may be, for example... Figures 1 to 4C The media sample holder shown and described above. When the media sample holder 100 is opened, a media sample can be placed, for example, into a recess in the media sample holder (e.g., as described above). Figure 1 The media sample holder is located in the recess 120 shown in the diagram. The cover (e.g., cover 102) of the media sample holder can be closed and secured, for example, by a snap-fit ​​engagement. The media sample holder can then be attached to, for example... Figures 1 to 4C The attachment adapters shown and described above. The sample holder may use retaining tabs (e.g., Figure 1 The retaining tab 116 shown and described above engages with the attachment adapter and a release lever arm (e.g., release lever arm 118) is used to secure the engagement of the retaining tab.

[0087] After attaching a media sample to the filter at 506, the media sample 508 can be removed, allowing the media sample to be tested at 502 to determine removal efficiency. The media sample holder can be removed from the attachment adapter. The release lever arm can be bent away from the retaining tab to allow the retaining tab to move and disengage from its engagement with the attachment adapter. Once the retaining tab is disengaged from the attachment adapter, the media sample holder can be removed. In one embodiment, the release lever arms are positioned such that each of the release lever arms can be gripped and bent with one hand. In one embodiment, each release lever arm includes a protrusion configured to provide a handle that facilitates bending the release lever arm. Once the media sample holder is removed, the media sample can be removed from the media sample holder, for example, by opening the cover of the media sample holder. Removal of the media sample at 508 can be performed at a known time following attachment of the media sample at 506. In one embodiment, removal of the media sample at 508 is performed at a predetermined time following attachment of the media sample at 506. In one embodiment, the predetermined time may be a predetermined time amount ranging from about one month to about three months.

[0088] Figure 6 A graph showing the removal efficiency curves of the filter and the media sample used in evaluating the filter is presented. In graph 600, it can be seen that the removal efficiency 602 of the media sample is significantly lower than the removal efficiency 604 of the filter. Furthermore, when compared to the removal efficiency curve 604 of the filter, the removal efficiency 602 of the media sample shows a more significant decrease in response to exposure, as can be seen from the shape of the curve. The relationship between the removal efficiency curve of the sample media and the removal efficiency curve 604 of the filter can be known, thus allowing the assessment of the exposure of the media sample to the filter 604 during the time the media sample is located at or near the filter to be correlated with the exposure of the filter 604. This correlation can be used to determine the filter's removal efficiency based on the filter's exposure according to the removal efficiency curve 604. The filter's exposure can be a value of concentration over time, such as parts per billion per hour (ppb / hr). By using the significantly smaller removal efficiency curve of the media sample, exposure over shorter time periods can be determined more accurately, thus allowing for more frequent assessments of filter exposure, removal efficiency, and remaining lifetime.

[0089] Figure 7 A perspective view showing a portion of a media sample holder according to one embodiment. Figure 7 The media holder body 700 is visible from the side containing the retaining structure 702. The media holder body 700 also includes a body opening 704. A recess (not shown) may be included on the opposite side of the media holder body 700 and sized to at least partially accommodate a media sample within the media holder containing the media holder body 700. The media holder body may include at least a portion of a hinge structure (not shown) that allows a cover (not shown) to engage with the media holder body 700. The cover and media holder body 700 may be fastened together to close the media holder by mechanical engagement of one or more features included in the cover with a locking surface 706.

[0090] Each retaining structure 702 includes a channel 708 at least partially defined by a bottom 710, a retaining wall 712, and a cam surface 714 opposite to the retaining wall. The cam surface 714 is located at one end of the flexible arm 716. In embodiments, the bottom 710 and the retaining wall 712 may be shaped such that the channel 708 can accommodate a structure to which the media holder body 700 is configured for attachment, such as those described below. Figure 10The attachment adapter 1000, filter comb, or any other suitable structure shown is illustrated. In an exemplary embodiment, the retaining wall 712 and the bottom 710 are each a flat surface, perpendicular to each other. In one embodiment, an extension of the retaining wall 712 extends beyond the surface of the media holder body 700. The cam surface 714 may be a surface configured to have a curved profile opposite the retaining wall 712. The cam surface 714 may be positioned and / or configured such that the distance between the outermost portion of the cam surface 714 and the retaining wall 712 is less than the thickness of the filter comb, attachment adapter, or any other such feature engaged by the retaining structure 702. The flexible arm 716 may be configured to flex when the filter comb, attachment adapter, or other such feature is inserted into the channel 708, such that the cam surface 712 is moved to a position in which the channel 708 can accommodate the filter comb, attachment adapter, or other such feature. When the filter comb, attachment adapter, or other such feature is located in the channel 708, the restoring force of the flexible arm 716 can provide pressure to clamp the filter comb, attachment adapter, or other such feature between the fixed wall 712 and the cam surface 714. In one embodiment, the fixed wall 712 may be replaced by a second cam surface (not shown) on a second flexible arm (not shown), which is opposite to the cam surface 714, wherein the channel 708 is defined by the bottom 710 and the first and second cam surfaces.

[0091] Figure 8 This is a perspective view of a media sample holder attached to a filter comb according to one embodiment. The media sample holder 800 includes a sample holder body 802 and a sample holder cover 804. The sample holder body 802 and the sample holder cover 804 are engaged together by a hinge 806 including a hinge pin 808. The sample holder cover 804 also includes a cover opening 810 that exposes a media sample held within the media sample holder 800. The sample holder body 802 and the sample holder cover 804 can be engaged by, for example, a snap-fit ​​(not shown) (e.g., a snap-fit ​​positioned opposite the hinge 806).

[0092] The media sample holder 800 includes a retaining structure 812. The retaining structure 812 includes a fixed wall 814, a bottom 816, and a cam surface 818 opposite to the fixed wall 814. The cam surface 818 is mounted at one end of the flexible arm 820.

[0093] The filter comb 822 is a comb configured to separate the pleats of the filter 824. The filter comb 822 includes ribs 826. The media sample holder 800 can be engaged to the ribs 826 via a retaining structure 812. The retaining structure 812 can be configured such that the distance between the fixed wall 814 and the cam surface 818 is less than the thickness of the ribs 826 when the flexible arm 820 is in its resting position. The retaining structure 812 can be further configured such that it can accommodate the ribs 826 when the flexible arm 820 is flexed.

[0094] When the ribs 826 are pressed together with the retaining structures 812, the flexible arms 820 of each retaining structure 812 are flexed due to the contact between the cam surface 818 and the ribs 826. The flexible arms 820 are flexed until the ribs 826 can be accommodated between the cam surface 818 and the fixed wall 814. The ribs 826 can be pressed together with the media sample holder 800 until the ribs 826 also contact the bottom 816. When the ribs 826 contact the bottom 816, the ribs 826 can be clamped between the cam surface 818 and the fixed wall 814 by the restoring force applied by the flexible arms 820.

[0095] Figure 9 exhibit Figure 8 Side view of the media sample holder 800 and filter comb 822. Figure 9 In the side view, the flexure of the flexible arm 820 can be seen more clearly, which moves the cam surface 818 to a position where the rib 826 can be fitted between the fixed wall 814 and the cam surface 818.

[0096] Figure 10 This diagram shows a perspective view of an attachment adapter for a media holder according to one embodiment. The attachment adapter 1000 includes a frame 1002 having a generally triangular shape and an extension 1004 perpendicular to a plane of the triangular shape. The extension 1004 may have features selected for attachment to the media holder (e.g., those described above). Figures 7 to 9 The thickness of the retaining structure 702 or 812 shown in the diagram is the same as the thickness of the filter comb (e.g., as described above). In one embodiment, the thickness of the extension 1004 is selected to be similar to or equal to that of the filter comb (e.g., as described above and...). Figure 8 and 9 The thickness of the filter comb 822 shown in the diagram. The frame and extensions provide a relatively flat outer surface 1006. The outer surface 1006 can be used to attach an attachment adapter to a surface, for example, by means of double-sided adhesive tape (which presents an engaging surface or attachment features, such as for hook and loop attachments or any suitable for mechanical engagement). The attachment adapter 1000 can be attached, for example, to the surface of a filter in which media monitoring will be used, to the surface containing the conduit or fluid passage of the filter to be monitored, or can be any other suitable accessory to allow the media holder to be held in place within the space of interest.

[0097] All aspects:

[0098] It should be understood that any aspect from 1 to 4 can be combined with any aspect from 15 to 24, 25 to 34, or 35 to 44. It should be understood that any aspect from 15 to 24 can be combined with any aspect from 25 to 34 or 35 to 44. It should be understood that any aspect from 25 to 34 can be combined with any aspect from 35 to 44.

[0099] Aspect 1. A medium sample holder, comprising:

[0100] Substrate, wherein the substrate comprises:

[0101] A substrate body comprising a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and

[0102] Multiple retaining assemblies configured to retain the media sample holder to an attachment adapter, comprising:

[0103] Retaining tabs, which extend from the base body; and

[0104] A release lever arm, which is opposite the retaining tab, wherein the release lever arm is flexible, extends from the base body toward the retaining tab, and includes a retaining surface at the end toward the retaining tab.

[0105] Aspect 2. The medium sample holder according to aspect 1, further comprising:

[0106] The cover includes a second opening configured to expose a second portion of the medium sample; and

[0107] A hinge that engages the base to the cover;

[0108] The base and the cover are configured to form a snap-fit ​​closure.

[0109] Aspect 3. The media sample holder according to any one of aspects 1 to 2, further comprising the attachment adapter, wherein the attachment adapter is configured to engage with the filter.

[0110] Aspect 4. The media sample holder according to aspect 3, wherein the attachment adapter includes a comb configured to mechanically engage the pleats in the filter.

[0111] Aspect 5. The medium sample holder according to aspect 3, wherein the attachment adapter includes a flat surface on the side opposite to the plurality of retaining assemblies configured to engage the attachment adapter.

[0112] Aspect 6. The media sample holder according to aspect 5, wherein the flat surface includes tape.

[0113] Aspect 7. The medium sample holder according to any one of aspects 1 to 6, wherein each of the release lever arms further comprises a ramp portion configured to release an engagement feature located between the release lever arm and the retaining tab.

[0114] Aspect 8. A medium sample holder according to any one of aspects 1 to 7, wherein the substrate comprises a melt-processable polymer.

[0115] Aspect 9. The medium sample holder according to any one of aspects 1 to 8, wherein the retaining surface includes a ramp portion angled relative to the opposing surface of the retaining tab.

[0116] Aspect 10. The medium sample holder according to any one of aspects 1 to 9, wherein each of the release lever arms includes a protrusion on the side opposite to the base body.

[0117] Aspect 11. The medium sample holder according to any one of aspects 1 to 10, further comprising a medium sample located within the recess, the medium sample being configured to adsorb one or more contaminants selected from acids, bases and volatile organic compounds.

[0118] Aspect 12. The media sample holder according to aspect 11, wherein the media sample has a known removal efficiency profile for the one or more contaminants, the known removal efficiency profile being different from the removal efficiency profile of a filter configured to be used with the media sample holder.

[0119] Aspect 13. A medium sample holder according to any one of aspects 11 to 12, wherein the medium sample comprises an adsorbent medium and a thin film surrounding the adsorbent medium, wherein the thin film is sealed at the periphery of the medium sample.

[0120] Aspect 14. The medium sample holder according to any one of aspects 2 to 13, further comprising an inlet configured to direct flow toward the second opening, the inlet having an inlet opening having an area larger than the area of ​​the second opening.

[0121] Aspect 15. A method for evaluating a filter, comprising:

[0122] Determine the removal efficiency of the media sample, wherein the media sample has been attached to the filter for a predetermined time period; and

[0123] The removal efficiency of the filter is determined based on the removal efficiency of the media sample and the predetermined time.

[0124] The removal efficiency curve of the media sample is different from that of the filter.

[0125] Aspect 16. The method according to aspect 15, further comprising attaching the media sample to the filter for the predetermined time amount using a media sample holder, the media sample holder comprising:

[0126] Substrate, wherein the substrate comprises:

[0127] A substrate body comprising a recess configured to receive a medium sample and an opening configured to expose a first portion of the medium sample; and

[0128] Multiple retaining assemblies, which include

[0129] Retaining tabs, which extend from the base body; and

[0130] A release lever arm, which is opposite the retaining tab, wherein the release lever arm is flexible, extends from the base body toward the retaining tab, and includes a retaining surface;

[0131] The cover includes an opening configured to expose a second portion of the medium sample;

[0132] A hinge that engages the base to the cover;

[0133] The base and the cover are configured to form a snap-fit ​​closure.

[0134] Aspect 17. The method according to aspect 16, wherein attaching the media sample holder to the filter includes engaging the plurality of retaining assemblies with the filter comb of the filter.

[0135] Aspect 18. The method according to aspect 16, wherein attaching the media sample to the filter includes engaging the plurality of retaining assemblies with an attachment adapter fixed to the filter.

[0136] Aspect 19. The method according to aspect 18, wherein the attachment adapter is secured to the filter by tape.

[0137] Aspect 20. The method according to any one of aspects 16 to 19, further comprising removing the media sample holder from the filter by bending the release lever arm.

[0138] Aspect 21. The method according to any one of aspects 15 to 20, wherein the media sample holder is attached to the filter on the upstream side of the filter.

[0139] Aspect 22. The method according to any one of aspects 15 to 21, wherein the medium sample is attached to the filter such that the medium sample is parallel to the flow passing through the filter.

[0140] Aspect 23. The method according to any one of aspects 15 to 21, wherein the medium sample is attached to the filter such that the medium sample is perpendicular to the flow passing through the filter.

[0141] Aspect 24. The method according to any one of aspects 15 to 21, wherein the medium sample is attached to the filter such that the medium sample is angled relative to the flow passing through the filter.

[0142] Aspect 25. A medium sample holder, comprising:

[0143] Substrate, wherein the substrate comprises:

[0144] A substrate body comprising a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and

[0145] Multiple holding structures configured to hold the media sample holder to an attachment adapter, the holding structures comprising:

[0146] Fixed wall;

[0147] bottom of the channel; and

[0148] A cam surface is mounted on the flexible arm, wherein the cam surface is opposite the fixed wall, and the cam surface, the bottom of the channel, and the fixed wall are configured to accommodate the attachment adapter when the flexible arm is in a flexed position.

[0149] Aspect 26. The medium sample holder according to aspect 25, further comprising:

[0150] The cover includes a second opening configured to expose a second portion of the medium sample; and

[0151] A hinge that engages the base to the cover;

[0152] The base and the cover are configured to form a snap-fit ​​closure.

[0153] Aspect 27. The media sample holder according to any one of aspects 25 to 26, further comprising the attachment adapter, wherein the attachment adapter is configured to engage with the filter.

[0154] Aspect 28. The media sample holder according to aspect 27, wherein the attachment adapter includes a comb configured to mechanically engage the pleats in the filter.

[0155] Aspect 29. The medium sample holder according to aspect 27, wherein the attachment adapter includes a frame having a generally triangular shape and an extension, the frame and the extension providing a flat outer surface, the extension having a thickness such that the retaining structure can accommodate the extension.

[0156] Aspect 30. A medium sample holder according to any one of aspects 25 to 29, wherein the substrate comprises a melt-processable polymer.

[0157] Aspect 31. The medium sample holder according to any one of aspects 25 to 30, further comprising a medium sample at least partially located within the recess, the medium sample being configured to adsorb one or more contaminants selected from acids, bases and volatile organic compounds.

[0158] Aspect 32. The medium sample holder according to aspect 31, wherein the medium sample comprises an adsorbent medium and a thin film surrounding the adsorbent medium, wherein the thin film is sealed at the periphery of the medium sample.

[0159] Aspect 33. A media sample holder according to any one of aspects 31 to 32, wherein the media sample has a known removal efficiency profile for the one or more contaminants, the known removal efficiency profile being different from the removal efficiency profile of a filter configured to be used with the media sample holder.

[0160] Aspect 34. The medium sample holder according to any one of aspects 26 to 33, further comprising an inlet configured to direct flow toward the second opening, the inlet having an inlet opening having an area larger than the area of ​​the second opening.

[0161] Aspect 35. A method for evaluating a filter, comprising:

[0162] Determine the removal efficiency of the media sample, wherein the media sample has been attached to the filter for a predetermined time period; and

[0163] The removal efficiency of the filter is determined based on the removal efficiency of the media sample and the predetermined time.

[0164] The removal efficiency curve of the media sample is different from that of the filter.

[0165] Aspect 36. The method according to aspect 35, further comprising attaching the media sample to the filter for the predetermined time amount using a media sample holder, the media sample holder comprising:

[0166] Substrate, wherein the substrate comprises:

[0167] A substrate body comprising a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and

[0168] Multiple holding structures configured to hold the media sample holder to an attachment adapter, the holding structures comprising:

[0169] Fixed wall;

[0170] bottom of the channel; and

[0171] A cam surface is mounted on a flexible arm, wherein the cam surface is opposite to the fixed wall, and the cam surface, the bottom of the channel, and the fixed wall are configured to accommodate the attachment adapter when the flexible arm is in a flexed position.

[0172] The cover includes an opening configured to expose a second portion of the medium sample;

[0173] A hinge that engages the base to the cover; and

[0174] The base and the cover are configured to form a snap-fit ​​closure.

[0175] Aspect 37. The method according to aspect 36, wherein attaching the media sample holder to the filter includes engaging the plurality of retaining structures with the attachment adapter, wherein the attachment adapter is a filter comb.

[0176] Aspect 38. The method according to aspect 36, wherein attaching the media sample to the filter includes engaging the plurality of retaining structures and an attachment adapter, wherein the attachment adapter includes a frame having a generally triangular shape and an extension, the frame and the extension providing a flat outer surface, the extension having a thickness such that the retaining structures can accommodate the extension.

[0177] Aspect 39. The method according to aspect 38, wherein the attachment adapter is secured to the filter by tape.

[0178] Aspect 40. The method according to aspect 38, wherein the attachment adapter is fixed near the filter.

[0179] Aspect 41. The method according to any one of aspects 36 to 40, further comprising removing the media sample holder from the filter by pulling the media sample holder away from the attachment adapter.

[0180] Aspect 42. The method according to any one of aspects 35 to 41, wherein the media sample holder is attached to the filter on the upstream side of the filter.

[0181] Aspect 43. The method according to any one of aspects 35 to 42, wherein the medium sample is attached to the filter such that the plane of the medium sample is parallel to the flow passing through the filter.

[0182] Aspect 44. The method according to any one of aspects 35 to 43, wherein the medium sample is attached to the filter such that the plane of the medium sample is perpendicular to the flow passing through the filter.

[0183] The examples disclosed in this application should be considered illustrative rather than restrictive in all respects. The scope of the invention is indicated by the appended claims rather than by the foregoing description; and all modifications falling within the meaning and scope of the equivalent forms of the claims are intended to be covered by this invention.

Claims

1. A medium sample holder, comprising: Substrate, wherein the substrate comprises: A substrate body having a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and Multiple retaining structures configured to accommodate the attachment adapter, The plurality of retaining structures include: Fixed wall; bottom of the channel; and A cam surface is mounted on a flexible arm, wherein the cam surface is opposite to the fixed wall, and the cam surface, the bottom of the channel, and the fixed wall are configured to accommodate the attachment adapter when the flexible arm is in a flexed position. The media sample holder further includes the attachment adapter, and the attachment adapter is configured to engage with the filter.

2. The medium sample holder according to claim 1, further comprising: The cover includes a second opening configured to expose a second portion of the medium sample; and A hinge that engages the base to the cover; The base and the cover are configured to form a snap-fit ​​closure.

3. The media sample holder of claim 1, wherein the attachment adapter includes a comb configured to mechanically engage the pleats in the filter.

4. The medium sample holder of claim 1, wherein the attachment adapter includes a frame and an extension having a generally triangular shape, the frame and the extension providing a flat outer surface, the extension having a thickness such that the retaining structure can accommodate the extension.

5. The medium sample holder of claim 1, further comprising a medium sample at least partially located within the recess, the medium sample being configured to adsorb one or more contaminants selected from acids, bases, and volatile organic compounds.

6. The medium sample holder of claim 2, further comprising an inlet configured to direct flow toward the second opening, the inlet having an inlet opening having an area larger than that of the second opening.

7. A method for evaluating filters, The filter is connected to an attachment adapter, which is included in a media sample holder, the media sample holder comprising: Substrate, wherein the substrate comprises: A substrate body having a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and Multiple retaining structures configured to accommodate the attachment adapter, The plurality of retaining structures include: Fixed wall; bottom of the channel; and A cam surface is mounted on a flexible arm, wherein the cam surface is opposite to the fixed wall, and the cam surface, the bottom of the channel, and the fixed wall are configured to accommodate the attachment adapter when the flexible arm is in a flexed position. The method includes: Determine the removal efficiency of the media sample, wherein the media sample has been attached to the filter for a predetermined time period; and The removal efficiency of the filter is determined based on the removal efficiency of the media sample and the predetermined time, wherein the removal efficiency curve of the media sample is different from the removal efficiency curve of the filter.

8. A filter evaluation apparatus for evaluating filters, comprising: The medium sample has a removal efficiency lower than that of the filter, and A retainer, configured to hold the media sample adjacent to the filter, such that the media sample is positioned to allow flow to pass through the media sample immediately before or after the flow passes through the filter. The removal efficiency of the media sample and the removal efficiency of the filter have a known relationship. The retainer includes: Substrate, wherein the substrate comprises: A substrate body having a recess configured to receive a medium sample and a first opening configured to expose a first portion of the medium sample; and Multiple holding structures configured to hold the media sample holder to the attachment adapter, The plurality of retaining structures include: Fixed wall; bottom of the channel; and A cam surface is mounted on the flexible arm, wherein the cam surface is opposite the fixed wall, and the cam surface, the bottom of the channel, and the fixed wall are configured to accommodate the attachment adapter when the flexible arm is in a flexed position.

Images