Gilson SS-21F Silent Sifter® Rotational Sieve Analyzer
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-21F |
| Pricing | Upon Request |
Overview
The Gilson SS-21F Silent Sifter® is a precision-engineered rotational sieve analyzer designed for standardized particle size distribution analysis in compliance with ASTM E11, ISO 3310-1, and USP <786>. Operating on a 230 V / 50 Hz power supply, this instrument employs a dual-mode motion principle—continuous rotational screening combined with controlled tapping—to ensure high reproducibility in dry sieve analysis. Unlike conventional vibratory or mechanical shaker systems, the SS-21F utilizes a low-noise, gear-driven dual-roller mechanism that rotates and gently taps stacked test sieves, minimizing energy-induced particle fracture while maximizing separation efficiency across the full analytical range (25 mm to 20 µm). Its acoustic enclosure—constructed from dense MDF with integrated vibration-dampening mounts—reduces operational noise to 68–72 dBA, representing a 7–10 dB improvement over legacy rotary sifters and supporting occupational health compliance under OSHA 29 CFR 1910.95 and EU Directive 2003/10/EC.
Key Features
- Low-noise operation (68–72 dBA) achieved via optimized roller geometry, UHMW-PE hammer heads, and acoustically sealed cabinet
- Dual-motion mechanism: continuous rotation + timed tapping ensures uniform particle stratification and efficient undersize passage
- Large 12.6 mm (0.5 in) LED display with ±1 second timer accuracy and programmable 1–99 minute cycles
- Ergonomic latch-and-rotate door system eliminates clamping tools; stack loading requires no alignment fixtures
- Robust structural frame fabricated from ASTM A513 heavy-gauge powder-coated steel tubing
- Integrated floor stand with locking swivel casters (two fixed, two braked) for safe relocation within lab or QC environments
- UL/CE-certified ¼ HP continuous-duty motor with thermal overload protection
- Enclosed cabinet design limits airborne respirable dust exposure—critical for quartz, crystalline silica, and pharmaceutical powders
Sample Compatibility & Compliance
The SS-21F accommodates standard ASTM E11 and ISO 3310-1 test sieves in diameters of 200 mm (8 in) and 300 mm (12 in), supporting full-height, half-height, and intermediate-height configurations. Maximum stack capacity includes up to 20 × 200 mm half-height sieves or 6 × 300 mm full-height sieves with receiver pan. The system is validated for use with abrasive, cohesive, and electrostatically sensitive materials—including cement, metal powders, APIs, excipients, soils, and catalysts—without compromising sieve integrity or measurement fidelity. It meets GLP documentation requirements when paired with optional audit-trail-capable controllers (e.g., SSA-76 replacement timer module), and supports FDA 21 CFR Part 11 compliance when integrated into validated LIMS or ELN workflows.
Software & Data Management
While the SS-21F operates as a standalone hardware platform with analog/digital control logic, its timing and operational parameters are fully traceable via the built-in digital timer with non-volatile memory. Optional accessories—including the SSA-76 programmable timer/controller—enable extended data logging, cycle replication, and password-protected parameter locking. When interfaced with laboratory informatics systems via RS-232 or USB-to-serial adapters (third-party), raw cycle duration, pause/resume timestamps, and operator ID inputs may be captured for audit-ready reporting. All firmware updates and calibration logs adhere to ISO/IEC 17025 clause 5.6.4 for equipment management.
Applications
This instrument is routinely deployed in quality control laboratories for cementitious materials (ASTM C100, C184), pharmaceutical granules (USP <786>), mineral processing (ASTM D4292), foundry sands (ASTM C778), and polymer additives. Its low-vibration architecture prevents false fines generation during analysis of brittle ceramics or friable agglomerates. In environmental labs, it supports EPA Method 1699 for sediment grain-size classification. The enclosed design also enables routine use in ISO Class 7 cleanrooms when equipped with HEPA-filtered exhaust add-ons (not included).
FAQ
What voltage and frequency does the SS-21F operate on?
The SS-21F is configured for 230 V AC at 50 Hz with a rated current draw of 5.4 A.
Does the SS-21F require external calibration or annual certification?
No routine calibration is required; however, periodic verification against NIST-traceable reference standards (e.g., certified glass bead sets) is recommended per ISO/IEC 17025 clause 6.4.3.
Can the SS-21F accommodate ISO 3310-1 sieves with stainless steel frames?
Yes—it accepts both brass and stainless steel ISO-compliant sieves in 200 mm and 300 mm diameters, provided mesh counts fall within the supported range (1–635).
