Gilson Sonic Sifters GA-6 AutoSieve

Overview

The Gilson GA-6 AutoSieve is an advanced, microprocessor-controlled acoustic sieving system engineered for precise, reproducible dry-powder particle size distribution analysis in the 5 µm to 850 µm range (equivalent to ASTM Sieve Series No. 20 to No. 270). Unlike conventional mechanical shakers or vibratory sievers, the GA-6 employs resonant acoustic energy—3,600 precisely timed pressure pulses per minute generated by a calibrated audio transducer—to induce controlled oscillation of the air column confined within a sealed sieve stack. This non-contact excitation mechanism fluidizes particles without mechanical impact, minimizing particle fracture and agglomeration while maximizing throughput efficiency. The system operates under CE-compliant electromagnetic and safety standards, with full design and final assembly performed in the United States. Its closed-loop architecture ensures operator safety, environmental containment, and regulatory alignment with OSHA respirable dust exposure limits and ISO 14644 cleanroom-compatible handling protocols.

Key Features

• Acoustic energy-driven sieving: 3,600 programmable air-column pulses/min enable gentle yet highly effective particle reorientation and surface contact renewal on mesh surfaces.
• Programmable tap action: Independent horizontal and vertical tapping sequences—configurable in amplitude, duration, and timing—prevent blinding and reduce particle packing, especially for cohesive, hygroscopic, or electrostatically charged powders.
• Fully customizable test profiles: Adjustable ramp-up rate, dwell time, total duration (0.5–99.9 min), and amplitude control via proportional power regulator ensure method optimization across diverse material classes.
• Non-volatile memory storage: Up to ten user-defined profiles retained without battery backup, supporting GLP-compliant method recall and inter-laboratory reproducibility.
• Modular, fixed-height stack architecture: Accommodates either seven 3-inch ASTM E11 woven-wire test sieves (mesh openings from 5.6 mm to 20 µm) or three 3-inch ASTM E161 precision electroformed nickel meshes (150 µm to 5 µm).
• Dust-containment design: Powder-coated steel cabinet with sliding acrylic door, latex diaphragm-sealed top, flexible latex fines collector, and column-lock clamping system minimize airborne particulate release—critical for ISO 14644-1 Class 7+ environments and OSHA PEL compliance.

Sample Compatibility & Compliance

The GA-6 is validated for use with free-flowing and marginally cohesive dry powders—including pharmaceutical actives, catalysts, metal powders, ceramics, pigments, and food-grade starches—where mechanical degradation must be avoided. It complies with ASTM E11 (Specification for Woven Wire Test Sieve Cloth and Test Sieves), ASTM E161 (Specification for Electroformed Thin Metal Sieve Mesh), and ISO 2591-1 (Particle Size Analysis — Sieving Method). Its closed operation supports adherence to FDA 21 CFR Part 11 requirements when integrated with compliant LIMS or ELN platforms, and its repeatable profile execution meets internal QC validation criteria for GMP manufacturing environments.

Software & Data Management

While the GA-6 operates via intuitive front-panel controls with LED display and tactile keypad, it supports external documentation via timestamped manual log entries or integration with laboratory information management systems (LIMS) through RS-232 or optional USB interface. All profile parameters—including amplitude setting, ramp slope, tap sequence, and total runtime—are digitally recorded per run. Audit trails are maintained manually or via connected software; full 21 CFR Part 11 compliance requires third-party electronic signature and audit-log modules. Non-volatile memory retains calibration history and user-defined methods across power cycles, ensuring continuity during routine QC workflows.

Applications

• Pharmaceutical: Granule and API particle sizing prior to tableting or inhalation formulation development (aligned with USP & Ph. Eur. sieve test chapters).
• Materials Science: Characterization of additive manufacturing metal powders (e.g., Ti-6Al-4V, Inconel 718) where mechanical attrition must be avoided.
• Quality Control Labs: Routine batch release testing per ASTM C136/C780 for construction aggregates, refractories, and abrasives.
• Research & Development: Method development for difficult-to-sieve materials such as nanosilica, fumed alumina, and spray-dried lactose blends.
• Environmental Testing: Soil and sediment fractionation in accordance with EPA Method 1684 (particle size distribution for suspended solids).

FAQ

What sieve standards are supported by the GA-6?

ASTM E11 woven-wire test sieves (3-inch diameter, acrylic frame) and ASTM E161 electroformed nickel mesh sieves (3-inch diameter), both traceable to NIST standards.
Can the GA-6 replace traditional mechanical sieve shakers in regulated environments?

Yes—when operated under documented, validated profiles and paired with appropriate data capture, it satisfies ASTM D6913 and ISO 13320 requirements for dry sieving; however, method equivalence studies are recommended for legacy SOP transitions.
Is the GA-6 suitable for moisture-sensitive samples?

Yes—the fully enclosed, low-energy acoustic process avoids thermal buildup and mechanical shear, preserving sample integrity better than rotary or tapping shakers.
How many sieve levels can be stacked simultaneously?

Seven 3-inch ASTM E11 sieves or three 3-inch ASTM E161 sieves, using the fixed-height GA-2 stacking assembly or optional GA-88 acrylic spacers.
What maintenance is required for long-term accuracy?

Routine replacement of the latex diaphragm (GA-3) and fines collector (GA-4), periodic verification of acoustic pulse frequency (calibration service available), and visual inspection of mesh integrity per ASTM E11 Section 7.