Gilson SS-33 Ro-Tap® II 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 Mechanical Sieve Shaker is a precision-engineered, dual-stack laboratory sieve shaker designed to perform standardized particle size distribution analysis in full compliance with ASTM E11, ISO 3310-1, and USP <786> requirements. Based on the proven Ro-Tap® motion principle—combining horizontal circular oscillation (278 cycles/min) with vertical tapping (150 taps/min)—this instrument delivers high reproducibility and mechanical consistency across repeated sieving tests. Unlike single-stack models, the SS-33 operates two independent 8-inch (203 mm) sieve stacks simultaneously under identical motion profiles, enabling parallel testing, cross-validation, or accelerated throughput without compromising method integrity. Its robust cast-iron frame, 1/4 HP induction motor, and rigid base-mounting capability ensure stable operation even during extended-duration assays. The device is manufactured in the United States by W.S. Tyler and distributed globally by Gilson, Inc., a trusted provider of analytical instrumentation for QC laboratories, materials science research, and pharmaceutical development.
Key Features
- Dual-stack architecture: Simultaneous operation of two independent 8-inch (203 mm) sieve columns, each accommodating up to six full-height or thirteen half-height test sieves
- Standardized Ro-Tap® motion: Precisely calibrated 278 oscillations/min + 150 vertical taps/min per stack, traceable to ASTM E11 and ISO 3310-1
- Digital timer with 0.1-second resolution: Programmable up to 99 minutes; supports repeatable timing protocols required for GLP/GMP-compliant workflows
- Quick-adjust sieve support plate: Tool-free height adjustment ensures optimal clamping force across varying stack configurations (full-, half-, or intermediate-height sieves)
- Universal voltage compatibility: Available in 115V/60Hz (SS-33), 230V/50Hz (SS-33F), and 230V/60Hz (SS-33S) variants for global deployment
- Structural stability: Designed for permanent benchtop mounting; optional sound enclosure (W.S. Tyler SoundShell®) available for noise reduction in shared lab environments
Sample Compatibility & Compliance
The SS-33 accommodates standard ASTM E11 and ISO 3310-1 test sieves with nominal diameters of 203 mm (8 in). It supports full-height, half-height, and intermediate-height sieve frames—including stainless steel, brass, and nylon mesh options—with opening sizes ranging from No. 4 (4.75 mm) to No. 635 (20 µm). All operational parameters—including motion amplitude, tap frequency, and oscillation rate—are factory-verified against NIST-traceable calibration standards. The unit meets electromagnetic compatibility (EMC) requirements per IEC 61326-1 and is suitable for use in laboratories adhering to FDA 21 CFR Part 11 (when paired with compliant data logging software), ISO/IEC 17025, and ASTM D6913 for soil particle analysis.
Software & Data Management
While the SS-33 operates as a standalone electromechanical instrument, its digital timer output can be integrated into external data acquisition systems via dry-contact relay signals (optional accessory). For full audit trail compliance, users may pair the shaker with Gilson’s G-Sieve™ Software Suite (sold separately), which provides timestamped test logs, user access control, electronic signatures, and export-ready reports conforming to 21 CFR Part 11 Annex 11 requirements. All firmware updates are delivered through secure, password-protected channels and include version-controlled change documentation.
Applications
- Pharmaceutical granulation and excipient characterization per USP <786> and EP 2.9.32
- Aggregate and mineral powder classification in construction materials testing (ASTM C136, AASHTO T 27)
- Cement fineness evaluation per ASTM C204 and EN 196-6
- Food ingredient particle sizing (e.g., flour, sugar, dairy powders) under ISO 9276-1
- Environmental sediment analysis (ASTM D6913, D422) and soil gradation studies
- Quality control of catalysts, ceramics, and battery electrode materials in R&D labs
FAQ
Does the SS-33 require periodic calibration verification?
Yes. While the mechanical motion profile is factory-set and highly stable, users should verify tap count and oscillation frequency annually using a certified tachometer or optical sensor, per ASTM E11 Section 8.2.
Can ISO-standard 200 mm sieves be used with the SS-33?
No. The SS-33 is dimensionally engineered for 203 mm (8 in) diameter sieves only. ISO 200 mm sieves are not compatible due to clamping interface mismatch.
Is the SS-33 suitable for wet sieving applications?
No. This is a dry-sieving instrument. For wet sieving, Gilson recommends the SS-200 Wet Sieve Shaker or integration with a vacuum-assisted slurry system.
What safety certifications does the SS-33 carry?
The unit complies with UL 61010-1 (North America), CE marking per EU Machinery Directive 2006/42/EC, and RoHS 2011/65/EU. Full certification documentation is provided with shipment.
How is maintenance performed on the Ro-Tap® II mechanism?
Annual lubrication of the camshaft and pivot bearings is recommended using NLGI #2 lithium grease. Gilson provides a service manual and OEM replacement parts kit (P/N SS-33-MK).
