Retsch AS200 Tap Sieve Shaker

Overview

The Retsch AS200 Tap Sieve Shaker is a precision-engineered mechanical sieve shaker designed for reliable, reproducible dry particle size analysis in accordance with standardized sieving methodologies. Operating on the principle of vertical tapping combined with horizontal oscillation, the AS200 Tap applies controlled, repeatable impact energy to the sieve stack—disrupting particle agglomeration and promoting stratification through gravitational settling and kinetic energy transfer. This dual-motion mechanism ensures high-efficiency separation across a broad particle size range (20 µm to 25 mm), making it particularly suitable for demanding applications in pharmaceuticals, chemicals, minerals, ceramics, and quality assurance laboratories where regulatory compliance and method traceability are critical. Introduced by Retsch GmbH (Haan, Germany) in 2008, the AS200 Tap reflects decades of German engineering expertise in particulate characterization instrumentation and remains widely referenced in ASTM E11, ISO 3310-1, and USP guidelines for sieve-based particle sizing.

Key Features

• Two selectable tap frequencies (150 or 280 taps per minute) allow optimization for both fragile and robust materials—minimizing particle fracture while maximizing throughput.
• Digital timer with 1–99 minute programmable duration ensures precise process control and full repeatability between runs.
• Robust cast-iron base and vibration-dampening feet provide mechanical stability during extended operation, reducing transmission of motion to adjacent equipment.
• Adjustable clamping system accommodates up to 13 nested sieves (standard 200 mm or 203 mm diameter), supporting multi-stage classification protocols without manual reconfiguration.
• Maximum sieve stack height of ~350 mm enables use of deep-frame sieves or layered sieve assemblies required for high-capacity or multi-fraction analyses.
• Integrated safety interlock prevents operation when the lid is open, complying with EN 61000-6-2/6-4 electromagnetic compatibility and machinery safety directives.

Sample Compatibility & Compliance

The AS200 Tap is validated for dry, free-flowing, non-cohesive, and moderately cohesive powders—including APIs, excipients, catalysts, metal powders, ground ores, and polymer granules. It is not intended for wet sieving or highly electrostatic or hygroscopic materials without prior conditioning. Its mechanical design and operational parameters align with internationally recognized standards for sieve analysis: ASTM E11 (Specification for Woven Wire Test Sieve Cloth and Test Sieves), ISO 3310-1 (Test Sieves — Technical Requirements and Testing — Part 1: Test Sieves of Metal Wire Cloth), and ISO 2591-1 (Methods of Test for Determination of Particle Size Distribution — Sieving Method). When operated within defined parameters and maintained per Retsch’s service schedule, the instrument supports GLP-compliant workflows and contributes to audit-ready documentation when paired with validated software tools.

Software & Data Management

While the AS200 Tap operates as a standalone mechanical unit, it is fully compatible with Retsch’s optional evaluation software (e.g., RETSCH Evaluation Software or third-party LIMS-integrated platforms) for post-sieving data processing. Users may import mass-on-sieve values manually or via digital scale interface to generate cumulative undersize/oversize distributions, calculate D10/D50/D90 values, and produce ISO/ASTM-compliant reports. The system supports export to CSV, PDF, and XML formats—enabling integration into electronic lab notebooks (ELN), quality management systems (QMS), and FDA 21 CFR Part 11–compliant environments when deployed with appropriate audit trail and user access controls.

Applications

• Pharmaceutical QC: Verification of granule and tablet excipient particle size distribution per USP and EP 2.9.31.
• Chemical manufacturing: Monitoring of catalyst support particle uniformity and batch-to-batch consistency.
• Mineral processing: Classification of crushed ore fractions prior to flotation or leaching stages.
• Food & feed industry: Assessment of flour, starch, and premix homogeneity for regulatory labeling and functional performance.
• Academic research: Fundamental studies on powder flowability, packing density, and segregation behavior under controlled mechanical agitation.

FAQ

What sieve diameters are supported by the AS200 Tap?
Standard compatibility includes 200 mm and 203 mm (8-inch) diameter test sieves conforming to ISO 3310-1 and ASTM E11 specifications.
Can the AS200 Tap be used for wet sieving?
No—it is strictly designed for dry sieving applications. Wet sieving requires dedicated equipment with fluid handling, drainage, and corrosion-resistant construction.
Is calibration required before routine use?
The AS200 Tap does not require periodic calibration of its mechanical drive; however, users must verify timer accuracy annually and confirm tap frequency using a certified tachometer as part of preventive maintenance.
How is compliance with 21 CFR Part 11 achieved?
When integrated with validated software and electronic balance interfaces, the AS200 Tap supports Part 11 requirements—including electronic signatures, audit trails, and role-based access control—provided the entire digital workflow is implemented and documented per organizational SOPs.
What maintenance is recommended for long-term reliability?
Retsch recommends biannual inspection of the tapping cam mechanism, lubrication of pivot points, verification of clamping force consistency, and cleaning of dust accumulation from the motor housing and control panel.