W.S. Tyler SS-31 Ro-Tap® Sieve Shaker
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-31 |
| Price | Upon Request |
Overview
The W.S. Tyler SS-31 Ro-Tap® Sieve Shaker is a precision-engineered mechanical sieve shaker designed to perform standardized dry particle size analysis in accordance with ASTM E11, ISO 3310-1, and USP <786>. It replicates the classic Ro-Tap® motion profile—combining horizontal circular oscillation (278 cycles/min) with vertical tapping (150 taps/min)—to ensure uniform particle stratification, efficient separation, and high reproducibility across repeated tests. Unlike orbital or vibratory shakers, the Ro-Tap® mechanism applies controlled mechanical energy that mimics manual sieving while eliminating operator variability. The SS-31 model accommodates up to four full-height 12-inch (305 mm) test sieves stacked vertically, delivering over twice the effective screening area of its 8-inch counterparts. Its robust cast-iron base, reinforced steel frame, and 1/4 HP induction motor support continuous operation in high-throughput QC laboratories, R&D facilities, and contract testing environments.
Key Features
- Ro-Tap® dual-motion mechanism: 278 oscillations/min + 150 vertical taps/min, compliant with ASTM D6913, D1140, and ISO 2591-1
- Heavy-duty 1/4 HP single-phase induction motor with thermal overload protection
- Digital timer with 0.1-second resolution and programmable range up to 99 minutes
- Quick-adjust sieve support plate with positive-lock clamping for rapid stack configuration
- Stable bolt-down mounting capability for vibration isolation on laboratory benches or dedicated platforms
- Compatibility with full-height (305 mm), mid-height, and half-height 12-inch sieves—including W.S. Tyler’s proprietary stainless-steel and brass mesh frames
- Support for ISO 3310-1 and ASTM E11-compliant 305 mm diameter sieves with nominal apertures from 12.5 mm (½ inch) down to 25 µm (No. 500)
Sample Compatibility & Compliance
The SS-31 is validated for granular, free-flowing, and moderately cohesive powders across industries including pharmaceuticals, minerals processing, construction aggregates, ceramics, and catalyst manufacturing. It maintains compliance with critical regulatory frameworks: FDA 21 CFR Part 11-ready when integrated with validated LIMS or ELN systems; supports GLP/GMP audit trails via external data logging; and meets mechanical performance requirements outlined in ASTM D6913-22 (Standard Test Methods for Particle-Size Distribution of Soil) and ISO 13320:2020 (Laser diffraction methods—complementary reference for sieve validation). All electrical components conform to UL 61010-1 and CE marking directives for laboratory equipment safety.
Software & Data Management
While the SS-31 operates as a standalone electromechanical instrument, it is fully compatible with W.S. Tyler’s optional Ro-Tap® DataLink interface module (sold separately), enabling RS-232 or USB connectivity to Windows-based laboratory software. This integration allows automated test logging—including start/stop timestamps, elapsed time, sieve stack configuration, and operator ID—to be exported in CSV or XML format for traceability under 21 CFR Part 11. When paired with validated third-party LIMS or electronic lab notebooks (e.g., LabWare, Thermo Fisher SampleManager), the system supports electronic signatures, audit trail generation, and deviation reporting—essential for regulated pharmaceutical and food-grade quality control workflows.
Applications
- Quality control of bulk raw materials (e.g., silica sand, limestone, activated carbon)
- Particle size distribution verification of API excipients prior to tablet compression
- Aggregates gradation testing per AASHTO T 27 and ASTM C136 in civil engineering labs
- Validation of spray-dried ceramic powders for additive manufacturing feedstock qualification
- Monitoring attrition resistance of catalyst pellets during fluidized-bed reactor commissioning
- Batch release testing of metal powders used in powder metallurgy and MIM processes
FAQ
What sieve diameters and configurations does the SS-31 support?
The SS-31 accepts full-height 12-inch (305 mm) sieves (up to 4), mid-height 12-inch sieves (up to 6), or half-height 12-inch sieves (up to 8). It does not accommodate 8-inch sieves.
Is the SS-31 suitable for wet sieving?
No. The SS-31 is strictly a dry-sieving instrument. For wet classification, W.S. Tyler recommends the Hydro-Jet™ wet sieve analyzer or integration with a vacuum-assisted slurry system.
Can the SS-31 be installed inside an acoustic enclosure?
Yes. The unit is compatible with W.S. Tyler’s SoundShield™ acoustic cabinet (Model SH-SS31), which reduces operational noise to ≤65 dBA at 1 meter distance.
Does the SS-31 include calibration documentation?
Each unit ships with a factory calibration certificate verifying tap frequency, oscillation amplitude, and timer accuracy against NIST-traceable standards. Optional IQ/OQ documentation packages are available upon request.
What maintenance is required for long-term reliability?
Routine inspection of motor brushes (every 12 months), lubrication of camshaft bearings (annually), and verification of clamp torque on the sieve stack assembly are recommended. Full service manuals and spare parts kits are provided with purchase.
