W.S. Tyler RX-812 RO-TAP® Coarse Sieve Shaker

Overview

The W.S. Tyler RX-812 RO-TAP® Coarse Sieve Shaker is a mechanically driven, standardized sieve shaker engineered for reproducible dry-sieving analysis of granular and powdered materials with particle sizes ≥150 µm (100 mesh). It operates on the principle of vertical tapping combined with horizontal orbital motion—a dual-motion mechanism defined in ASTM E11-09 and ISO 3310-1 for coarse fractionation—ensuring consistent particle stratification and efficient separation across stacked sieve decks. Unlike rotary or vibratory shakers optimized for fine powders, the RX-812 is purpose-built for coarse-to-medium particle size distributions (PSD), where mechanical energy transfer must be sufficient to overcome interparticle friction without inducing attrition or over-classification. Its robust cast-iron base and precision-machined cam-driven tapper deliver high repeatability in laboratory and QC environments where regulatory traceability and method compliance are critical.

Key Features

• Dual-motion operation: Vertical tapping (15–20 mm stroke) + horizontal orbital rotation (7.5 mm radius) per ASTM E11-09 Annex A1, enabling effective stratification of coarse aggregates, ores, foundry sands, and agricultural granules.
• Interchangeable sieve platform kits support both 8-inch (200 mm) and 12-inch (305 mm) diameter sieves—no tool required—with rapid adapter switching to accommodate full-height or half-height configurations.
• Fixed-frequency drive system: 231 rpm at 50 Hz (standard for EU/Asia) and 280 rpm at 60 Hz (North America); no variable-speed control, ensuring method consistency across laboratories using standardized test protocols.
• High-capacity stacking: Up to 6 full-height 8-in sieves or 4 full-height 12-in sieves—ideal for multi-fraction cascade analysis of bulk solids in mining, construction materials, and feed manufacturing.
• Compliance-ready design: All mechanical interfaces meet dimensional tolerances specified in ASTM E11-09 for sieve frame compatibility; mounting clamps apply uniform pressure to prevent lateral displacement during operation.
• Compact footprint (56 × 38 × 33 cm) and low mass (25 kg) enable benchtop deployment in regulated labs without dedicated floor space or reinforced flooring.

Sample Compatibility & Compliance

The RX-812 is validated for use with dry, free-flowing, non-cohesive particulates ranging from 150 µm (100 mesh) up to 10 mm—materials including crushed stone, gravel, metal shot, plastic pellets, roasted coffee beans, and ceramic granules. It is not suitable for cohesive, hygroscopic, electrostatic, or fibrous samples requiring wet sieving or ultrasonic assistance. All operational parameters align with ASTM E11-09 (Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves), ISO 3310-1 (Test Sieves — Technical Requirements and Testing), and USP (Particle Size Distribution by Sieve Analysis). The device supports GLP-compliant workflows when paired with calibrated, certified sieves and documented run logs.

Software & Data Management

The RX-812 is a standalone electromechanical instrument with no embedded microprocessor or digital interface. Timing is managed externally via laboratory stopwatch or programmable timer (e.g., ASTM D6913-compliant duration settings: 10–15 min typical for coarse fractions). Data integrity relies on manual recording of retained mass per sieve fraction, followed by cumulative weight-percent calculations per ASTM C136 or ISO 13320 guidelines. For audit readiness, users are advised to maintain a controlled logbook or LIMS-integrated spreadsheet tracking sieve lot numbers, calibration dates, operator ID, ambient temperature/humidity, and sieve stack configuration per run.

Applications

• Quality control of coarse aggregates in concrete and asphalt production per ASTM C136/C136M.
• Particle size grading of foundry molding sands (ASTM D2256, ISO 14688-1).
• Batch verification of industrial abrasives, catalyst supports, and filter media granules.
• Routine screening of recycled construction debris prior to size-reduction processing.
• Educational demonstrations of sedimentary sorting principles in geotechnical and materials science curricula.

FAQ

Does the RX-812 include sieves?
No—sieves are sold separately. Only the shaker base unit is supplied; users must select ASTM E11-09-compliant woven-wire or perforated plate sieves matching their application’s aperture range and diameter.
Can the RX-812 be used with 50 Hz and 60 Hz power supplies?
Yes—the motor is configured for fixed-frequency operation at either 231 rpm (50 Hz) or 280 rpm (60 Hz); units are region-specific and cannot be field-retrofitted for dual-frequency use.
What is the minimum recommended sieve mesh size?
100 mesh (150 µm) is the practical lower limit; finer apertures risk clogging, reduced efficiency, and non-compliant motion transmission due to insufficient tap energy relative to particle inertia.
Is the RX-812 compliant with FDA 21 CFR Part 11?
No—it lacks electronic data capture, audit trail, or user authentication capabilities; however, its mechanical consistency supports Part 11-aligned documentation practices when integrated into validated SOPs.
How often does the RX-812 require maintenance?
Annual inspection of cam follower wear, clamp spring tension, and motor bearing lubrication is recommended; no scheduled calibration is required beyond periodic verification of rotational/tapping amplitude using manufacturer-supplied gauges.