W.S. Tyler Ro-Tap® II Sieve Shaker SS-33

Overview

The W.S. Tyler Ro-Tap® II Sieve Shaker SS-33 is a precision-engineered, dual-stack mechanical sieve shaker designed for rigorous particle size distribution (PSD) analysis in compliance with ASTM E11, ISO 3310-1, and USP . Unlike single-stack models, the SS-33 executes two independent 8-inch (203 mm) sieve stacks simultaneously—each replicating the standardized Ro-Tap® motion profile: 278 horizontal orbital oscillations and 150 vertical taps per minute. This dual-channel architecture enables parallel sample processing without compromising test fidelity, significantly improving laboratory throughput while maintaining strict adherence to regulatory method requirements. The device employs a robust 1/4 HP induction motor coupled with a rigid cast-iron frame and adjustable leveling feet, ensuring mechanical stability during extended operation. Its motion mechanism—comprising a cam-driven eccentric shaft and gravity-assisted tapping arm—is calibrated to deliver consistent kinetic energy transfer across all sieve diameters and load conditions, supporting high reproducibility (RSD < 2% for repeated analyses under GLP conditions).

Key Features

• Dual independent 8-inch (203 mm) sieve stack capability—enables concurrent analysis of two samples or replicate runs under identical motion parameters
• Standardized Ro-Tap® motion: 278 rpm orbital oscillation + 150 taps/min vertical impact—fully compliant with ASTM E11 Section 7.2 and ISO 3310-1 Annex A
• Digital timer with 0.1-second resolution and 99-minute maximum duration—supports programmable, repeatable test cycles with non-volatile memory retention
• Quick-adjust sieve support plate with positive-lock clamping—accommodates full-height, half-height, and intermediate-height sieves without tools
• Universal voltage compatibility: 115 V / 60 Hz, 230 V / 50 Hz, and 230 V / 60 Hz variants available (SS-33, SS-33F, SS-33S)
• Structural mounting provisions—includes pre-drilled base holes for secure bolting to laboratory benches or vibration-dampening platforms
• Optional acoustic enclosure (W.S. Tyler SoundShell®) compatible—reduces operational noise to ≤65 dBA at 1 m distance

Sample Compatibility & Compliance

The SS-33 accommodates standard 8-inch (203 mm) test sieves conforming to ASTM E11 and ISO 3310-1 specifications—including brass, stainless steel, and nylon mesh types. It supports full-height sieves (up to 6 per stack), half-height sieves (up to 13 per stack), and ISO 200 mm round sieves. Particle size separation ranges from No. 4 (4.75 mm) to No. 635 (20 µm), making it suitable for applications in pharmaceutical granulation, mineral processing, catalyst characterization, and cement fineness testing. All motion parameters are traceably validated against NIST-traceable calibration standards. The system meets GMP documentation requirements when paired with optional audit-trail-enabled software (e.g., TylerNet™ v4.2), supporting FDA 21 CFR Part 11 compliance for electronic records and signatures.

Software & Data Management

While the SS-33 operates as a standalone electromechanical instrument, it integrates seamlessly with W.S. Tyler’s TylerNet™ Laboratory Software Suite (sold separately). TylerNet™ provides automated test protocol storage, digital logbook functionality with user authentication, timestamped event logging (start/stop/timer reset), and export-ready CSV/PDF reports. When configured with a USB-connected data acquisition module, the software captures real-time motor current draw and cycle completion status—enabling preventive maintenance alerts and long-term performance trending. All electronic records include immutable timestamps, operator ID, and version-controlled method files, satisfying GLP audit requirements for method validation and equipment qualification (IQ/OQ/PQ).

Applications

• Pharmaceutical: Excipient and API particle sizing per USP , blend uniformity assessment, and tablet coating thickness correlation studies
• Construction Materials: Cement fineness (Blaine vs. sieve analysis correlation), aggregate gradation per ASTM C136, and fly ash classification
• Chemicals & Catalysts: Zeolite and molecular sieve particle distribution, pigment dispersion quality control, and polymer powder flowability screening
• Food & Agriculture: Flour particle grading, spice micronization verification, and soil texture analysis (ASTM D422)
• Academic Research: Method development for PSD intercomparison studies, calibration of laser diffraction instruments, and rheological behavior modeling of granular systems

FAQ

What is the difference between the SS-33 and the SS-30 or SS-31 models?

The SS-33 is a dual-stack variant of the Ro-Tap® II platform, enabling simultaneous operation of two independent 8-inch sieve columns. In contrast, the SS-30 supports one 8-inch stack and the SS-31 supports one 12-inch stack—neither offers parallel processing capability.

Can the SS-33 accommodate ISO 200 mm sieves?

Yes—the SS-33’s universal sieve clamp assembly accepts both ASTM-standard 8-inch (203 mm) and ISO 200 mm diameter test sieves, provided they conform to ISO 3310-1 dimensional tolerances.

Is the SS-33 suitable for GMP-regulated environments?

When used with TylerNet™ software and appropriate procedural controls (e.g., documented calibration, operator training, and periodic performance verification), the SS-33 satisfies core GMP expectations for particle size testing equipment per ICH Q5A and FDA Guidance for Industry on Analytical Procedures.

What maintenance is required for long-term reliability?

Annual inspection of cam follower lubrication, tap arm pivot wear, and motor brush integrity (if applicable) is recommended. W.S. Tyler provides certified field service and OEM replacement kits for all motion-critical components.

Does the SS-33 include a sieve set or accessories?

No—the SS-33 is supplied as a bare shaker unit. ASTM or ISO-compliant test sieves, receiver pans, lid assemblies, and optional accessories (e.g., SoundShell®, Clean-N-Stor™ fraction collectors) are ordered separately based on application requirements.