Gilson SS-33 Ro-Tap® II Dual-Stack Mechanical Sieve Shaker
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-33 |
| Pricing | Available Upon Request |
Overview
The Gilson SS-33 Ro-Tap® II Dual-Stack Mechanical Sieve Shaker is a precision-engineered laboratory instrument designed to perform standardized dry sieve analysis in full compliance with ASTM E11, ISO 3310-1, and USP <786> particle size distribution testing protocols. Based on the proven Ro-Tap® motion principle—combining horizontal circular oscillation (278 cycles/min) with vertical tapping (150 taps/min)—this dual-stack shaker replicates the manual sieving action defined in international standards while delivering superior reproducibility, operator independence, and long-term mechanical stability. Unlike single-stack models, the SS-33 executes two independent 8-inch (203 mm) sieve stacks simultaneously under identical kinematic conditions, enabling parallel sample processing without cross-contamination or timing drift. Its robust cast-iron frame, 1/4 HP totally enclosed fan-cooled (TEFC) induction motor, and vibration-dampening base mount ensure consistent performance during high-throughput QC workflows in pharmaceutical, mineralogical, construction materials, and food-grade powder laboratories.
Key Features
- Dual independent 8-inch (203 mm) sieve stack configuration for concurrent, synchronized sieving of two samples
- Ro-Tap® II motion profile: 278 oscillations/min + 150 vertical taps/min—fully compliant with ASTM E11 Section 7.2 and ISO 3310-1 Annex A
- Digitally programmable timer with 0.1-second resolution and 99-minute maximum duration, supporting GLP-compliant test documentation
- Quick-adjust sieve support plate system accommodating full-height, half-height, or intermediate-height Tyler® and ISO-standard test sieves
- Integrated leveling feet and optional bench-bolt mounting kit for stable operation under continuous duty cycles
- Electronically regulated motor drive ensures constant amplitude and frequency across voltage variants (115V/60Hz, 230V/50Hz, 230V/60Hz)
- Front-access service panel for routine maintenance and calibration verification per manufacturer’s technical bulletin TB-SS33-02
Sample Compatibility & Compliance
The SS-33 accepts standard W.S. Tyler® and ISO 3310-1–compliant test sieves with nominal diameters of 203 mm (8 in). It supports full-height (75 mm depth), half-height (38 mm), and intermediate-height (51 mm) configurations—enabling up to 13 half-height sieves per stack when used with appropriate receiver pans. Particle size separation is validated across the range of No. 4 to No. 635 (4.75 mm to 20 µm), making it suitable for granular soils, catalysts, APIs, excipients, abrasives, and ceramic powders. All operational parameters—including tap force, oscillation radius, and dwell time—are traceable to NIST-traceable calibration references. The unit meets CE marking requirements for machinery safety (2006/42/EC) and electromagnetic compatibility (2014/30/EU), and its electrical design conforms to UL 61010-1 and IEC 61010-1 for laboratory equipment.
Software & Data Management
While the SS-33 operates as a standalone electromechanical instrument without embedded firmware or network connectivity, its timer output and mechanical repeatability are fully compatible with external data acquisition systems. Laboratories implementing 21 CFR Part 11–compliant workflows may integrate the SS-33 into validated LIMS or ELN platforms via analog pulse output (optional accessory) or digital relay interface (Model SS-33-IOKIT). Audit trails for test duration, start/stop timestamps, and operator ID can be recorded externally. Gilson provides IQ/OQ documentation templates aligned with ASTM D6913 and ISO/IEC 17025 requirements, including motor torque verification, amplitude calibration, and tap-force validation procedures.
Applications
- Pharmaceutical quality control: Uniformity of dosage units, blend homogeneity assessment, and granulation endpoint determination per USP <786>
- Geotechnical engineering: Soil gradation analysis per ASTM D6913 and AASHTO T 27
- Mineral processing: Crushed aggregate sizing, flotation feed characterization, and tailings classification
- Food & beverage: Flour particle distribution, sugar crystal grading, and spice milling consistency verification
- Advanced materials R&D: Ceramic green-body powder characterization, battery electrode slurry solids distribution, and metal AM feedstock screening
FAQ
What sieve standards does the SS-33 support?
The SS-33 accommodates both ASTM E11–specified W.S. Tyler® Ro-Tap® sieves and ISO 3310-1–compliant 200 mm and 203 mm diameter test sieves.
Can the SS-33 be used for wet sieving?
No—the SS-33 is engineered exclusively for dry sieve analysis. For wet sieving applications, Gilson recommends the Model SS-200W ultrasonic sieve shaker or the SS-1000 hydraulic classifier system.
Is the SS-33 compatible with noise-reduction enclosures?
Yes—Gilson offers the Model NC-3300 Ro-Tap® Acoustic Enclosure, a steel cabinet lined with 25 mm acoustic foam that reduces operational sound pressure level from 82 dB(A) to ≤65 dB(A) at 1 m distance.
How is calibration verified for regulatory audits?
Calibration involves periodic verification of oscillation frequency (±0.5%), tap count accuracy (±1 tap/min), and timer resolution (±0.1 s) using Gilson-certified calibration tools and documented SOPs aligned with ISO/IEC 17025 Clause 6.5.
What maintenance intervals are recommended for continuous operation?
Motor lubrication every 2,000 operating hours; tap mechanism inspection and adjustment every 6 months; and full mechanical alignment verification annually per Gilson Maintenance Manual MM-SS33 Rev. 4.
