Shimadzu AUW-D Series Semi-Micro Analytical Balance

Overview

The Shimadzu AUW-D Series Semi-Micro Analytical Balance is an engineered precision instrument designed for laboratories requiring high-resolution mass measurement in constrained sample volumes. Built upon Shimadzu’s proprietary Uni Bloc monolithic aluminum sensor architecture, this balance eliminates traditional multi-component load cell assemblies—reducing mechanical hysteresis, thermal drift, and vibration sensitivity. The Uni Bloc sensor operates on electromagnetic force compensation (EMFC) principles, delivering stable, repeatable measurements at resolutions down to 0.01 mg (10 µg) across its dual-range configurations (e.g., 120 g / 42 g and 220 g / 82 g). Its sealed mechanical design significantly attenuates convective air currents—enabling reliable operation inside fume hoods, laminar flow cabinets, or unconditioned lab environments where airflow-induced instability has historically compromised semi-micro weighing accuracy.

Key Features

• Uni Bloc Monolithic Sensor: A single-piece aluminum sensing element ensures structural rigidity, minimized creep, and exceptional long-term stability—eliminating alignment drift and reducing recalibration frequency.
• PSC (Predictive Self-Calibration): Continuously monitors ambient temperature fluctuations and initiates automatic internal calibration when sensitivity deviation exceeds predefined thresholds—ensuring traceable accuracy without manual intervention.
• Programmable Timer Calibration: Supports user-defined calibration schedules (e.g., every 2 hours, at startup, or at specific times), compliant with GLP and ISO/IEC 17025 documentation requirements.
• Direct-Window Data Transfer: Transmits weight values directly to Windows-based applications (e.g., Excel, LIMS, ELN) via a single USB-to-RS-232 cable—no driver installation or proprietary software required.
• Integrated Density Determination: When paired with Shimadzu’s optional density determination kit (including sinker, pycnometer, and suspension fixture), the balance calculates solid or liquid density per ASTM D792 and ISO 1183 standards.
• Ergonomic Accessory Design: Tool-free door removal, low-friction sliding tracks, and front-accessible leveling feet simplify cleaning, maintenance, and routine verification—critical for regulated QC/QA workflows.

Sample Compatibility & Compliance

The AUW-D Series accommodates diverse sample forms—including powders, granules, viscous liquids, and small-volume solids—within its 80 mm diameter weighing pan. Its compact footprint (220 × 330 mm) allows seamless integration into analytical hoods, gloveboxes, or automated sample-handling stations. The balance meets international metrological standards including OIML R 76-1 (Class I), ISO 9001 calibration traceability requirements, and supports audit-ready data integrity via built-in timestamped ISO print output and interval data logging. All calibration events—including PSC triggers and timer-based cycles—are recorded with date/time stamps and stored in non-volatile memory, satisfying FDA 21 CFR Part 11 electronic record retention expectations when used with validated LIMS interfaces.

Software & Data Management

No dedicated software installation is required for basic data acquisition. The Direct-Window function maps real-time weight readings as keyboard-input keystrokes into any active Windows field—ideal for rapid entry into spreadsheets or electronic lab notebooks. For advanced workflow integration, RS-232C output supports ASCII protocol (including STX/ETX framing and CR/LF termination), enabling compatibility with laboratory information management systems (LIMS), chromatography data systems (CDS), and custom Python/Node.js parsing scripts. Optional battery operation (with external rechargeable pack) extends portability for field-deployed quality audits or mobile calibration verification tasks.

Applications

This balance serves critical roles in pharmaceutical formulation (API weighing, excipient ratio verification), polymer research (catalyst dosing, nanocomposite dispersion quantification), environmental testing (filter mass change in PM2.5 analysis), and academic materials science (thin-film deposition yield calculation). Its 0.01 mg readability supports USP repeatability testing for low-dose drug products, while dual-range capability allows both gross tare and fine-net weighing within a single instrument—reducing cross-contamination risk and improving throughput in high-volume QC labs.

FAQ

Does the AUW-D Series support GLP-compliant calibration documentation?
Yes—each PSC event, timer calibration, and manual calibration is time-stamped and logged internally. ISO-formatted printouts include operator ID (if entered), balance ID, calibration standard mass, and deviation values.
Can density measurements be performed without third-party software?
Yes—the balance executes full density calculations internally when the optional density kit is connected and configured via front-panel menu navigation.
Is RS-232 communication compatible with modern computers lacking serial ports?
Yes—standard USB-to-RS-232 adapters (FTDI chipset recommended) maintain full protocol fidelity; no additional drivers are needed beyond OS-native CDC ACM support.
What environmental conditions are recommended for optimal performance?
Operating temperature: 10–30 °C; relative humidity: ≤80 % RH (non-condensing); vibration isolation is advised but not mandatory due to Uni Bloc’s inherent damping characteristics.
How frequently should external verification weights be used?
Per ISO/IEC 17025, daily verification using Class E2 or better weights is recommended before first use and after any relocation—especially when operating near specification limits.