Unicise GeWu Series 0.1 mg Analytical Balance with Extended Capacity

Overview

The Unicise GeWu Series 0.1 mg Analytical Balance is engineered for precision mass measurement in regulated laboratory environments requiring high reproducibility, rapid stabilization, and traceable data integrity. Utilizing a proprietary electromagnetic force compensation (EMFC) single-body sensor architecture, the balance delivers consistent 0.1 mg readability across its extended capacity range of 320 g to 520 g—addressing a critical gap between standard analytical and precision balances. Its dynamic temperature compensation system actively corrects for thermal drift at ±0.5 ppm/K over an operational range of +10 °C to +30 °C, ensuring metrological stability without manual recalibration under typical lab conditions. Designed for ISO/IEC 17025-accredited testing labs, QC/QA departments, and R&D facilities, the GeWu Series meets the functional and compliance requirements of pharmacopeial methods (USP <41>, EP 2.1.3), ASTM E898, and ISO 9001 quality management systems.

Key Features

• EMFC Single-Body Sensor: Monolithic electromagnetic transducer eliminates mechanical hysteresis and bearing wear, delivering long-term linearity (±0.1 mg) and repeatability (≤0.1 mg at 5% load).
• Modular Ergonomic Design: Detachable high-resolution color touchscreen display with customizable hotkeys and LED key illumination; stainless steel 316L weighing pan and base plate ensure corrosion resistance and cleanability.
• Advanced Draft Shield: Removable ultra-clear anti-static glass enclosure with volcano-shaped base plate for optimized airflow management and minimized convection-induced error.
• Intelligent Calibration Logic: –I models feature automatic internal calibration triggered by time interval or temperature shift ≥1.0 °C—fully compliant with ISO 17025 clause 6.5.2 and EU GMP Annex 15.
• Dual-Interface Connectivity: Simultaneous RS-232 (SBI protocol) and USB Type-C (SICS protocol) enable seamless integration into LIMS, ELN, and MES platforms while supporting legacy instrument networks.
• GLP/GMP Data Governance: Built-in user authentication (3-tier role-based access), audit trail (3,000 entries, immutable export), and metadata tagging (device ID, sample ID, batch ID) satisfy 21 CFR Part 11 electronic record requirements.

Sample Compatibility & Compliance

The GeWu Series accommodates diverse sample forms—including powders, granules, liquids in tared vessels, and small solid components—within its 320–520 g capacity envelope. Its minimum weight function calculates and displays the smallest weighable quantity (SWQ) based on user-defined uncertainty thresholds (e.g., k=2, U = 0.5%), preventing sub-optimal measurements below method-defined limits. All models comply with OIML R76-1 (Class I), EN 45501, and ANSI/NCSL Z540-1. The –I variants are preconfigured for GxP environments: audit trail entries capture operator ID, timestamp, action type (e.g., “calibration executed”, “zero performed”), and parameter values—all exportable in CSV or PDF format with digital signature verification.

Software & Data Management

Embedded firmware supports 12 built-in weighing applications: standard weighing, formulation, statistics (mean, SD, CV), density determination (with auxiliary kit), percentage weighing, unit conversion, animal weighing, checkweighing, peak hold, counting, and comparative mass analysis. Direct PC data transmission eliminates manual transcription: real-time weight values stream to designated Excel cells or database fields via SICS-compliant drivers. Audit trail logs are stored in non-volatile memory with cyclic overwrite protection and can be exported via USB to external storage in tamper-evident format—meeting ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Pharmaceutical dosage form development and content uniformity testing per USP <905>
• Reference standard preparation and dilution in analytical chemistry workflows
• Quality control of active pharmaceutical ingredients (APIs) and excipients
• Material science research involving catalysts, nanomaterials, and thin-film substrates
• Environmental lab analysis of filter weights for particulate matter (PM_2.5/PM₁₀) quantification
• Food safety testing including moisture loss assays and additive concentration validation

FAQ

What is the difference between UBAxxx and UBAxxx-I models?
The –I suffix denotes integrated internal calibration; these models perform autonomous recalibration triggered by ambient temperature change (>1.0 °C) or scheduled intervals, eliminating manual intervention.
Does the balance support 21 CFR Part 11 compliance?
Yes—the –I models provide full electronic signature capability, audit trail with immutable export, and role-based user permissions aligned with FDA expectations for electronic records.
Can the balance operate on battery power?
Yes—USB-C input supports external power banks (5 V / 2 A), enabling portable use in field labs or cleanroom staging areas without fixed AC infrastructure.
How is minimum weight calculated and enforced?
The system computes SWQ using user-configurable uncertainty parameters and displays real-time warning when sample mass falls below the validated threshold—supporting risk-based decision-making per ICH Q2(R2).
Is the draft shield fully removable for cleaning?
Yes—the entire anti-static glass enclosure detaches without tools; the volcano-shaped base plate facilitates rapid residue removal and prevents static accumulation during maintenance.