Pharma-test PTWS 820D Semi-Automatic 8-Position Dissolution Sampling System

Overview

The Pharma-test PTWS 820D is a semi-automatic, 8-position dissolution testing system engineered for precise, regulatory-compliant in vitro release assessment of solid oral dosage forms. It operates on the principles of paddle (USP Apparatus 2) and basket (USP Apparatus 1) dissolution methodologies, maintaining strict adherence to hydrodynamic conditions defined by USP and , European Pharmacopoeia (Ph. Eur.) 2.9.3 and 2.9.4, Japanese Pharmacopoeia (JP) 15, and Chinese Pharmacopoeia (ChP) General Chapter 0931. The system features a single-drive motor architecture with independent shaft control per vessel, enabling synchronized yet individually addressable rotation across all eight dissolution vessels arranged in a 4+4 configuration. Temperature regulation is maintained via a digitally controlled water bath with ±0.2 °C stability over time, and real-time bath temperature verification is performed automatically prior to each sampling event—ensuring thermal integrity throughout the test duration.

Key Features

• Single-motor, 8-vessel drive architecture with individual vessel encoding for traceable method assignment and audit-ready operation
• Motorized vertical lift mechanism for precise, repeatable immersion depth adjustment of paddles or baskets (compliant with USP immersion tolerance)
• Integrated optical and acoustic signaling system: multicolor traffic-light status indicator (green = ready, yellow = warming/stabilizing, red = error/failure) and audible alerts at sampling intervals
• Onboard self-diagnostic routine at power-on, including motor calibration check, temperature sensor validation, and position encoder verification
• Low-volatility dissolution vessel lids minimizing solvent evaporation during extended tests (e.g., 24–72 h profiles)
• Tool-free, quick-release water bath assembly for efficient cleaning and maintenance—designed to meet GLP laboratory hygiene standards
• Stepwise manual mode with programmable start delay, enabling operator-controlled initiation of dissolution cycles without full automation
• OQ/PQ readiness prompts embedded in firmware, guiding users through qualification steps aligned with ICH Q5C and ASTM E2503-19

Sample Compatibility & Compliance

The PTWS 820D accommodates standard USP-compliant 1-L dissolution vessels (with optional 250 mL and 500 mL configurations), supporting tablets, capsules, granules, and multiparticulate systems. Vessel geometry and fluid dynamics have been validated per USP mechanical calibration requirements, including centering accuracy (<1 mm deviation), rotational speed accuracy (±1 rpm at 50 rpm), and wobble tolerance (<0.5 mm). The system meets ISO/IEC 17025:2017 documentation expectations for instrument qualification records and supports 21 CFR Part 11-compliant user access control when paired with Pharma-test’s optional PT-Soft Suite v4.2 (requires separate validation protocol). All firmware logs—including temperature readings, sampling timestamps, motor status, and error codes—are stored on removable SD card with timestamped, non-erasable entries compliant with ALCOA+ data integrity principles.

Software & Data Management

While the PTWS 820D operates as a stand-alone unit with an integrated LCD interface, it interfaces seamlessly with Pharma-test’s PT-Soft Suite for advanced method development, data export (CSV, PDF, XML), and electronic signature-enabled report generation. The system supports up to 999 unique test methods stored locally on SD card, each with customizable parameters: rotation speed (25–250 rpm), test duration (up to 99 h 59 min), sampling intervals (1 s–99 h), temperature setpoint (25–45 °C), and vessel-specific pH/temperature logging triggers. Audit trails capture all user actions—including method edits, parameter changes, and login/logout events—with immutable timestamps. Data export formats are compatible with LIMS integration and statistical process control (SPC) platforms used in QC/QA environments.

Applications

This system is routinely deployed in pharmaceutical R&D laboratories, contract research organizations (CROs), and manufacturing QA units for dissolution profile comparison (f1/f2 analysis), batch release testing, stability-indicating method development, and formulation optimization. Its robust architecture supports bioequivalence studies requiring high inter-day reproducibility (RSD <2% for dissolution rate at t_30min across 6 vessels), forced degradation investigations, and sink condition validation. When coupled with HPLC or UV-Vis quantification systems, the PTWS 820D enables full compliance with ICH Q5A(R2) and Q5C guidelines for product comparability assessments.

FAQ

Is the PTWS 820D compatible with both USP Apparatus 1 and 2?
Yes—it accepts standard USP-compliant baskets and paddles with interchangeable shaft adapters and maintains mechanical tolerances per USP for both configurations.
Does the system include OQ/PQ documentation templates?
The unit ships with a comprehensive OQ/PQ checklist and test protocols aligned with Ph. Eur. 2.9.3 and USP ; site-specific execution requires qualified personnel and calibrated reference instruments.
Can sampling be triggered manually during a run?
Yes—the stepwise manual mode allows on-demand sampling initiation while preserving all logged environmental parameters and timestamps.
What is the maximum allowable deviation in vessel temperature during a 6-hour test?
Per internal validation data, the system maintains ±0.3 °C deviation from setpoint over 6 h under nominal load conditions (8 vessels, 37 °C, 50 rpm), verified using NIST-traceable thermistors.
Is remote monitoring supported?
No native Ethernet or Wi-Fi interface is included; however, RS-232 serial output enables connection to external SCADA or lab automation systems via custom scripting or middleware.