W.S. Tyler SS-33 Ro-Tap® II Dual-Stack Sieve Shaker
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-33 |
| Price | Upon Request |
Overview
The W.S. Tyler SS-33 Ro-Tap® II Dual-Stack Sieve Shaker is an ASTM-compliant mechanical sieve shaker engineered for high-precision, reproducible particle size distribution analysis in quality control, R&D, and regulatory testing laboratories. It operates on the standardized Ro-Tap® motion profile—combining horizontal circular oscillation (278 cycles/min) with vertical tapping (150 taps/min)—to emulate manual sieving while eliminating operator variability. Unlike single-stack models, the SS-33 simultaneously processes two independent 8-inch (203 mm) sieve stacks under identical kinematic conditions, enabling parallel sample analysis or method validation without cross-contamination or time lag. Its robust cast-iron frame, 1/4 HP totally enclosed fan-cooled (TEFC) induction motor, and rigid base-mounting capability ensure long-term stability during continuous operation. Designed for compliance with ASTM E11, E161, ISO 3310-1, and USP , the SS-33 supports GLP/GMP workflows through traceable timing and repeatable mechanical actuation.
Key Features
- Dual-stack architecture: Two fully independent 8-inch (203 mm) sieve columns operate simultaneously with synchronized Ro-Tap® motion—no shared drive coupling or mechanical interference.
- ASTM-certified motion profile: Precisely calibrated at 278 oscillations/min ±2 and 150 taps/min ±2, verified per ASTM E11 Annex A1 calibration protocols.
- Digital timer with 0.1-second resolution: Programmable up to 99 minutes; non-volatile memory retains settings after power interruption.
- Quick-adjust sieve support plate: Tool-free height locking mechanism accommodates full-height, half-height, or intermediate-height sieves—including ISO 200 mm frames.
- Heavy-duty construction: Reinforced steel housing, vibration-dampening rubber feet, and optional bench-bolt mounting kit for zero-drift performance.
- Universal voltage compatibility: Available in 115 V / 60 Hz, 230 V / 50 Hz, and 230 V / 60 Hz configurations with CE- and UL-listed motor controllers.
Sample Compatibility & Compliance
The SS-33 accepts standard 8-inch (203 mm) test sieves per ASTM E11 and ISO 3310-1 specifications, including stainless steel, brass, and nylon mesh types. It supports sieve meshes ranging from No. 4 (4.75 mm) to No. 635 (20 µm), covering coarse aggregates, pharmaceutical granules, catalyst powders, and fine ceramics. Full-height sieve capacity: up to six 8-inch sieves per stack; half-height capacity: up to thirteen 8-inch sieves per stack. All configurations maintain consistent tap energy distribution across the sieve surface, validated via ASTM E323 tap-force mapping procedures. The unit complies with OSHA 1910.95 noise exposure limits when used with optional W.S. Tyler Sound Enclosure (sold separately), reducing operational sound pressure to ≤72 dBA at 1 m.
Software & Data Management
While the SS-33 operates as a standalone electromechanical instrument without embedded software, its digital timer provides audit-ready timestamped run logs when paired with external lab data systems. For regulated environments, the timer’s fixed-interval repeatability satisfies FDA 21 CFR Part 11 requirements for electronic records when integrated into validated LIMS or ELN platforms using analog output triggers or RS-232 serial interface adapters (available as optional accessories). Calibration certificates—including motor speed verification, tap force measurement, and timer accuracy validation—are provided with each unit and conform to ISO/IEC 17025-accredited laboratory practices.
Applications
- Quality assurance of bulk pharmaceutical excipients and active ingredients per USP and EP 2.9.31.
- Aggregate gradation testing in civil engineering labs per ASTM C136 and AASHTO T 27.
- Catalyst and battery material particle sizing in R&D labs requiring dual-sample correlation studies.
- Food ingredient consistency monitoring (e.g., flour, sugar, spices) per AOAC 992.03.
- Mineral processing QC where inter-laboratory comparability is mandated by ISO 13320.
FAQ
Does the SS-33 require periodic recalibration?
Yes. Annual verification of oscillation frequency, tap count, and timer accuracy is recommended per ASTM E11 Section 8.3 and manufacturer guidelines.
Can ISO 200 mm sieves be used interchangeably with ASTM 8-inch frames?
Yes—the SS-33’s adjustable support plate accommodates both 200 mm (ISO) and 203 mm (ASTM) diameter sieves without adapter plates.
Is the dual-stack design suitable for method equivalency studies?
Yes. Independent stack actuation enables side-by-side comparison of two samples or duplicate runs under identical mechanical conditions—critical for ASTM D6913 and ISO 17892-4 validation protocols.
What maintenance is required for long-term reliability?
Routine inspection of motor belts (if equipped), tap hammers, and support plate lock mechanisms every 500 operating hours; lubrication of camshaft bearings per W.S. Tyler Maintenance Manual Rev. 4.2.
Can the SS-33 be integrated into automated lab workflows?
Yes—via optional 0–10 VDC start/stop signal input and TTL-compatible run-complete output, enabling synchronization with robotic sample handlers or PLC-controlled test sequences.
