{"product_id":"touch-screen-geotextile-apparent-opening-size-aos-tester","title":"Touch-screen Geotextile Apparent Opening Size (AOS) Tester","description":"\u003ch2\u003eTouchscreen Geotextile Apparent Opening Size (AOS) Tester – QualiGTX™ AOS T\u003c\/h2\u003e\n\u003cp\u003eThe QualiGTX™ AOS T measures the apparent opening size of single-layer geotextiles and other geosynthetic materials\n    through a controlled dry sieving process. Using graded glass beads, it identifies the characteristic pore size of a\n    fabric and determines whether its openings provide the required balance between soil retention and water passage.\n    This measurement is essential for civil engineering laboratories, geosynthetic manufacturers, and highway\n    quality-control teams evaluating filter fabric performance.\u003c\/p\u003e\n\u003cp\u003eDesigned for different fabric constructions, the tester accommodates materials ranging from needle-punched nonwovens\n    to woven monofilament geotextiles. Its color touchscreen provides centralized control of the sieving process,\n    allowing operators to configure and monitor testing through a single interface.\u003c\/p\u003e\n\u003cp\u003eFor higher testing throughput, the QualiGTX™ AOS T includes five specimen pressing rings, allowing five fabric\n    samples to be prepared and tested during one cycle. Its 200 mm sieve column accommodates a stacked frame height of\n    up to 400 mm, eliminating the need to divide a full test assembly into multiple runs. The low-noise drive helps\n    maintain a suitable working environment in shared laboratory spaces, while the supplied graded glass bead set\n    provides the reference materials needed to begin testing.\u003c\/p\u003e\n\u003cp\u003eConsistent mechanical movement is essential for obtaining reliable apparent opening size measurements. The instrument\n    maintains horizontal oscillation at 221 cycles per minute and vertical tapping at 147 impacts per minute. An 8 mm\n    amplitude and 12.5 mm radius of gyration establish a consistent agitation pattern throughout the test. By\n    maintaining these operating conditions, the tester supports comparable O95 measurements across operators, work\n    shifts, production batches, and laboratories. The resulting data helps engineers select appropriate geotextile\n    filters for drainage, soil separation, and erosion-control applications.\u003c\/p\u003e\n\u003ch2\u003eQualiGTX™ AOS T Applications\u003c\/h2\u003e\n\u003cp\u003eThe QualiGTX™ AOS T is suitable for laboratories and engineering projects that require accurate assessment of\n    geotextile pore size to evaluate filtration performance and soil retention.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eGeotextile Production and Quality Assurance: Manufacturers can assess woven and nonwoven fabric batches to\n            verify that measured opening sizes remain within established product specifications before materials are\n            released.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eHighway and Pavement Construction: Engineers can evaluate separation geotextiles used between subgrade soils\n            and aggregate base layers to determine whether the fabric prevents fine soil particles from migrating into\n            the pavement structure.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eDrainage and Filtration Engineering: Measured O95 values can be compared with the d85 particle size of the\n            retained soil to identify a suitable geotextile grade for filtration systems.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eDams, Levees, and Canal Construction: Testing helps verify the suitability of filter fabrics installed behind\n            riprap, beneath revetments, and around drainage collectors in hydraulic structures.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eCoastal Protection and Erosion Management: The instrument evaluates geotextiles intended for scour\n            protection, shoreline armoring, and silt fence installations.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eLandfill and Environmental Containment Systems: Laboratories can check the pore size of protective and\n            filtration layers used in leachate collection systems to assess their filtration characteristics.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eIndependent and Accredited Testing Laboratories: Third-party facilities can perform routine apparent opening\n            size measurements for construction contractors, material specifiers, and product certification programs.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eGeosynthetic Research and Material Development: Researchers can investigate how fiber arrangement, denier,\n            and bonding techniques influence the measured pore size of newly developed geotextile fabrics.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eQualiGTX™ AOS T Key Features\u003c\/h2\u003e\n\u003cp\u003eThe QualiGTX™ AOS T integrates automated touchscreen operation, controlled specimen agitation, and a multi-sample\n    sieve arrangement to support efficient and consistent geotextile opening size testing.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eColor Touchscreen Operation: Operators can configure the test duration and monitor the complete sieving cycle\n            through a centralized display, simplifying operation compared with conventional multi-knob control systems\n            and reducing training requirements.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eFive-Specimen Testing Capacity: The system processes five geotextile samples in one cycle, increasing\n            laboratory throughput and reducing the time required for incoming fabric batch inspections.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eFive Specimen Pressing Rings Included: Dedicated pressing rings hold each sample flat without introducing\n            tension, providing consistent conditions for glass bead interaction with the fabric.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eLow-Noise Drive Mechanism: The drive system limits operating noise associated with mechanical sieve tapping,\n            making the instrument suitable for laboratories located near offices and sample preparation areas.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eGraded Glass Bead Set Supplied: The included reference beads provide the materials required for dry sieving,\n            allowing testing to begin without separately sourcing the specified media.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003e200 mm Sieve Column and 400 mm Stack Capacity: The column accommodates sieve frames and collection pans with\n            a maximum stacked height of 400 mm, supporting complete test assemblies in a single run.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eConsistent Oscillation and Tapping Frequencies: Fixed operating rates of 221 horizontal oscillations and 147\n            vertical taps per minute help maintain comparable testing conditions across different operators, shifts, and\n            laboratory locations.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eControlled 8 mm Amplitude and 12.5 mm Radius of Gyration: These defined movement parameters establish the\n            agitation pattern needed to distribute glass beads consistently across the specimen surface.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eHeavy-Duty Floor-Standing Construction: With a total mass of 160 kg, the rigid frame helps absorb mechanical\n            vibration during tapping and maintains sieve column stability throughout the testing cycle.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTheory and Test Method\u003c\/h2\u003e\n\u003cp\u003eThe apparent opening size of a geotextile is determined indirectly by observing how effectively the fabric allows\n    glass beads of known diameters to pass through its openings. In the dry sieving method, a specimen is secured inside\n    a sieve frame, and a measured quantity of glass beads from a specific size fraction is distributed over its surface.\n    The assembled unit then undergoes controlled agitation for a predetermined period.\u003c\/p\u003e\n\u003cp\u003eDuring this process, beads with diameters smaller than the fabric openings can pass through the geotextile and\n    collect in the pan positioned underneath. Beads that cannot pass through remain above the specimen. The collected\n    material is subsequently weighed to establish the percentage of the original bead charge that passed through the\n    fabric.\u003c\/p\u003e\n\u003cp\u003eThe procedure is repeated using progressively larger bead fractions to develop a relationship between bead diameter\n    and percentage passing. From this distribution, the apparent opening size, expressed as O95, is determined as the\n    bead diameter corresponding to 5% or less passing through the specimen. This measurement provides an estimate of the\n    largest soil particle size that can pass through the geotextile and serves as an important parameter in filter\n    retention calculations.\u003c\/p\u003e\n\u003cp\u003eGeotextile selection requires balancing particle retention with water transmission. A fabric with a smaller O95 can\n    retain finer soil particles but may restrict water flow, whereas a larger O95 generally allows easier drainage while\n    increasing the risk of fine soil migration and piping.\u003c\/p\u003e\n\u003cp\u003eThe dry sieving process relies on two coordinated movements to produce representative results. Horizontal rotary\n    oscillation moves the glass bead layer across the specimen, exposing the beads to different fabric openings rather\n    than allowing them to remain concentrated in the same positions. Vertical tapping introduces impact energy that\n    helps release beads lodged within the geotextile structure.\u003c\/p\u003e\n\u003cp\u003eThe QualiGTX™ AOS T maintains fixed horizontal and vertical movement rates together with an 8 mm amplitude to ensure\n    consistent agitation conditions. Changes in these parameters affect the energy transferred to the bead layer and can\n    consequently influence the measured apparent opening size. Maintaining controlled operating conditions is therefore\n    essential for obtaining repeatable O95 results.\u003c\/p\u003e\n\u003ch2\u003eTouch-screen Geotextile Apparent Opening Size (AOS) Tester - QualiGTX™ AOS T Technical Specifications\u003c\/h2\u003e\n\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eParameter\u003c\/th\u003e\n            \u003cth\u003eSpecification\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eTest Principle\u003c\/td\u003e\n            \u003ctd\u003eDry sieving, single-layer geotextile and related products\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eMeasured Property\u003c\/td\u003e\n            \u003ctd\u003eApparent opening size (AOS \/ O95)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Diameter\u003c\/td\u003e\n            \u003ctd\u003e200 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Stack Height\u003c\/td\u003e\n            \u003ctd\u003e400 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Base Amplitude\u003c\/td\u003e\n            \u003ctd\u003e8 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Oscillation Rate\u003c\/td\u003e\n            \u003ctd\u003e221 oscillations\/min\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eTapping Rate\u003c\/td\u003e\n            \u003ctd\u003e147 taps\/min\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eRadius of Gyration\u003c\/td\u003e\n            \u003ctd\u003e12.5 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSpecimen Capacity\u003c\/td\u003e\n            \u003ctd\u003e5 specimens per cycle\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eControl System\u003c\/td\u003e\n            \u003ctd\u003eColor touchscreen\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eMotor Power\u003c\/td\u003e\n            \u003ctd\u003e0.37 kW\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eVotlage\u003c\/td\u003e\n            \u003ctd\u003eAC 380 V, 50 Hz\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eDimensions (W × D × H)\u003c\/td\u003e\n            \u003ctd\u003e700 × 620 × 1360 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eWeight\u003c\/td\u003e\n            \u003ctd\u003e160 kg\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIncluded Configuration\u003c\/h3\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eItem\u003c\/th\u003e\n            \u003cth\u003eQuantity\u003c\/th\u003e\n            \u003cth\u003eDescription\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eStandard Glass Bead Set\u003c\/td\u003e\n            \u003ctd\u003e1 set\u003c\/td\u003e\n            \u003ctd\u003eGraded reference beads for dry sieving determinations\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSpecimen Pressing Rings\u003c\/td\u003e\n            \u003ctd\u003e5\u003c\/td\u003e\n            \u003ctd\u003eClamps geotextile specimens flat within the sieve frames\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eTouchscreen Control Unit\u003c\/td\u003e\n            \u003ctd\u003e1\u003c\/td\u003e\n            \u003ctd\u003eSets and monitors the sieving cycle\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Column Assembly\u003c\/td\u003e\n            \u003ctd\u003e1\u003c\/td\u003e\n            \u003ctd\u003e200 mm frames with 400 mm stacking capacity\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Qualitest USA LC","offers":[{"title":"Default Title","offer_id":53604179149111,"sku":null,"price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/1859\/1543\/files\/touch-screen-geotextile-apparent.webp?v=1794479422","url":"https:\/\/qualitest.us\/pt\/products\/touch-screen-geotextile-apparent-opening-size-aos-tester","provider":"Qualitest USA LC","version":"1.0","type":"link"}