W.S. Tyler SS-33 Ro-Tap® II Dual-Stack Sieve Shaker
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-33 |
| Pricing | Upon Request |
Overview
The W.S. Tyler SS-33 Ro-Tap® II Dual-Stack Sieve Shaker is an ASTM-compliant mechanical sieving instrument engineered for high-reproducibility particle size distribution (PSD) analysis in quality control, R&D, and regulatory testing laboratories. It operates on the standardized Ro-Tap® motion principle—combining horizontal circular oscillation (278 cycles/min) with vertical tapping (150 taps/min)—to replicate the manual sieving action defined in ASTM E11, ASTM C136, ISO 3310-1, and USP <786>. Unlike single-stack shakers, the SS-33 executes two independent 8-inch (203 mm) sieve stacks simultaneously under identical kinetic parameters, doubling throughput without compromising test fidelity. Its robust cast-iron frame, precision-machined cam drive, and 1/4 HP totally enclosed fan-cooled (TEFC) induction motor ensure long-term stability during continuous operation. Designed for integration into GLP- and GMP-aligned workflows, the SS-33 supports audit-ready documentation when paired with validated software and calibrated sieves.
Key Features
- Dual-stack architecture enables parallel processing of two full-height 8″ (203 mm) sieve columns—each accommodating up to six standard-height sieves or thirteen half-height sieves—reducing total analysis time by ~45% versus sequential operation.
- Digitally controlled timing system with 0.1-second resolution and programmable range up to 99 minutes ensures precise adherence to method-defined durations per ASTM E323 and ISO 2591-1.
- Adjustable sieve support plate with quick-lock mechanism maintains consistent clamping force across all stack configurations, minimizing lateral displacement and sieve misalignment.
- Integrated vibration-dampening feet and optional steel sound enclosure (W.S. Tyler SoundShell®) reduce operational noise to ≤72 dBA at 1 m—critical for open-lab environments and ISO 17025-accredited facilities.
- Universal voltage compatibility: available in 115 V / 60 Hz (SS-33), 230 V / 50 Hz (SS-33F), and 230 V / 60 Hz (SS-33S) variants—each certified to IEC 61000-6-2 (EMC) and UL 61010-1 (safety).
- Motor and drive train engineered for >20,000 hours MTBF; base-mounting provisions allow rigid anchoring to concrete or steel workbenches to eliminate resonance-induced measurement drift.
Sample Compatibility & Compliance
The SS-33 accommodates standard W.S. Tyler® test sieves—including ASTM E11, ISO 3310-1, and USP-certified stainless steel, brass, or nylon meshes—in diameters of 8″ (203 mm) only. It supports sieve openings from No. 4 (4.75 mm) through No. 635 (20 µm), covering coarse aggregates, pharmaceutical powders, catalysts, metal powders, and ceramic granules. All motion parameters conform to the kinematic envelope specified in ASTM D6913 and ISO 2591-1 for tap-and-oscillate sieving. When used with NIST-traceable calibration sieves and documented SOPs, data generated on the SS-33 satisfies FDA 21 CFR Part 11 requirements for electronic records when paired with compliant LIMS or validated spreadsheet protocols.
Software & Data Management
While the SS-33 operates as a standalone electromechanical unit, its timing interface is compatible with external data acquisition systems via TTL pulse output (optional accessory). Laboratories implementing digital workflows commonly integrate it with W.S. Tyler’s SieveTrak™ software (v4.2+), which logs start/stop timestamps, cycle counts, operator ID, and environmental metadata (ambient temperature/humidity) for each run. All exported CSV reports include ISO/IEC 17025–aligned traceability fields: equipment ID, calibration due date, sieve lot numbers, and method reference (e.g., “ASTM C136-22 Annex A1”). Audit trails are retained for ≥10 years per internal QA policy.
Applications
- Aggregates & construction materials: gradation analysis of sand, gravel, and crushed stone per ASTM C136 and AASHTO T 27.
- Pharmaceuticals: uniformity of dosage units, excipient flowability assessment, and blend homogeneity verification per USP <786> and EP 2.9.32.
- Metallurgy: particle size verification of atomized metal powders (e.g., Ti-6Al-4V, Inconel 718) prior to additive manufacturing feedstock qualification.
- Food & agriculture: flour fineness testing (ISO 565), spice particle distribution, and soil texture classification (USDA Textural Triangle).
- Chemicals & catalysts: catalyst support particle integrity screening and activated carbon mesh retention validation.
FAQ
Does the SS-33 require periodic calibration?
Yes. While the mechanical motion profile is factory-set and stable, annual verification of tap frequency (±2 taps/min), oscillation rate (±3 cycles/min), and timer accuracy (±0.1 s over 60 min) is recommended per ISO/IEC 17025 Clause 6.5. Calibration certificates are issued by W.S. Tyler–authorized service centers.
Can ISO 200 mm sieves be used with the SS-33?
No. The SS-33 is dimensionally engineered for 8″ (203 mm) diameter sieves only. For ISO 200 mm compatibility, the SS-30 or SS-31 models are recommended.
Is the SS-33 compliant with FDA 21 CFR Part 11?
The hardware itself is not electronic record–capable; however, when integrated with validated software (e.g., SieveTrak™ with electronic signatures and audit trail), the complete system meets Part 11 requirements for closed-system environments.
What maintenance is required for long-term reliability?
Monthly inspection of cam follower lubrication, quarterly torque verification of mounting bolts, and annual bearing inspection by certified technicians. No user-serviceable electronics are present—motor and timer modules are sealed and replaced as assemblies.
Can the SS-33 be mounted inside a fume hood or containment cabinet?
Yes, provided minimum clearance of 15 cm (6″) is maintained around all sides for heat dissipation and access to controls. The 115 V / 60 Hz variant is most commonly installed in North American hoods with dedicated 15 A circuits.
