A&D GX203A Advanced Internal Calibration Precision Balance

Overview

The A&D GX203A is a high-performance internal calibration precision balance engineered for laboratories and quality control environments requiring consistent, traceable mass measurement at the milligram level. Utilizing electromagnetic force compensation (EMFC) technology, it delivers stable, drift-resistant weighing performance under variable ambient conditions. Its core architecture integrates real-time environmental monitoring—automatically detecting temperature fluctuations and initiating internal recalibration to maintain metrological integrity without manual intervention. Designed and manufactured in Japan by A&D Co., Ltd., a globally recognized leader in analytical and precision weighing instrumentation, the GX203A conforms to international metrological standards including OIML R76 and meets functional requirements for ISO/IEC 17025-accredited testing laboratories. The balance operates within a nominal capacity range of 220 g and achieves a readability of 0.001 g, with repeatability and linearity validated to ±0.001 g across its full span.

Key Features

• Automatic Internal Calibration (ISD & Auto-Cal): Built-in motorized calibration mass and temperature-compensated calibration routine ensure long-term accuracy; triggered automatically upon power-on, time-scheduled, or temperature shift (>1.0 °C).
• Intelligent Stability Detection (ISD): Monitors mechanical shock events during operation—e.g., accidental impact or vibration—and logs timestamped alerts to support root-cause analysis in regulated production environments.
• Automatic Minimum Weight Assessment (APA): Implements A&D’s proprietary ECL (Enhanced Calibration Logic) algorithm to dynamically determine and validate the minimum weighable quantity (MWQ) per USP and ASTM E899 guidelines, ensuring compliance with risk-based weighing protocols.
• Flow Rate Display (FRD): Enables real-time calculation and display of mass flow rate (g/s or g/min) for liquid dispensing, powder transfer, or continuous feeding applications—ideal for formulation and process validation workflows.
• Dual Communication Interface: Simultaneous RS-232C and USB-B ports support concurrent connection to PCs, printers, PLCs, or barcode scanners—enabling automated data capture, remote control, and bidirectional command execution (e.g., tare, print, zero).
• User Access Control & Audit Trail: Configurable permissions for up to 11 users—including administrator, operator, and verifier roles—with password protection and activity logging aligned with FDA 21 CFR Part 11 requirements for electronic records.

Sample Compatibility & Compliance

The GX203A accommodates diverse sample types via its standard stainless-steel pan (128 × 128 mm) and optional down-hanging hook assembly for density determination or magnetic susceptibility measurements. It supports GLP/GMP/GCP-compliant reporting with customizable header fields, automatic timestamping, and export-ready formats (CSV, TXT) compatible with LIMS integration. All measurement, calibration, and configuration events are stored with immutable metadata—including operator ID, date/time stamp, environmental conditions, and result uncertainty—supporting full auditability. The balance satisfies regulatory expectations for instrument qualification (IQ/OQ/PQ), including documented verification of repeatability, eccentricity, linearity, and sensitivity error per ISO 17025 Clause 6.5.

Software & Data Management

Internal memory retains up to 200 weighing records, 50 calibration logs, and 50 unit mass entries—each tagged with user ID, timestamp, and environmental parameters. Data export is supported via direct USB flash drive or PC-connected software (A&D WinCT or third-party compliant platforms). Optional WinCT-Balance software enables advanced statistical analysis (mean, SD, CV%), trend charting, and automated report generation conforming to GLP templates. For enterprise deployment, the GX203A supports Ethernet-ready expansion modules (sold separately) and is compatible with LabWare, STARLIMS, and Thermo Fisher SampleManager via standard ASCII or Modbus RTU protocols.

Applications

The GX203A serves critical functions across pharmaceutical QC labs (raw material assay, tablet weight variation per USP ), chemical R&D (catalyst dosing, stoichiometric preparation), food safety testing (moisture content, ash residue), and academic research (nanomaterial dispersion quantification, polymer additive blending). Its FRD and APA capabilities make it especially suitable for continuous gravimetric feeders in pilot-scale manufacturing, while ISD functionality enhances reliability in shared lab spaces or production-floor installations subject to mechanical disturbance.

FAQ

Does the GX203A support external calibration with certified weights?
Yes—the balance accepts external calibration via standard Class M1 or better weights through the dedicated CAL mode, though internal calibration remains the primary traceable method.
Is the down-hanging hook included as standard equipment?
Yes—a corrosion-resistant stainless-steel hook and protective cover are supplied with every GX203A unit.
Can the GX203A operate on battery power?
An optional rechargeable Li-ion battery pack (model BP-GX) is available, providing up to 8 hours of continuous operation—ideal for field use or mobile QC stations.
What density measurement accessories are compatible?
The optional AD-1673 density kit includes sinker, thermometer, and software module for solid/liquid density and specific gravity calculations per ISO 1183 and ASTM D792.
How does the GX203A handle draft interference in non-enclosed environments?
Its adaptive filtering algorithm and dual-chamber draft shield design (when used with optional AD-1687 enclosure) minimize air current effects, achieving stable readings even at 0.001 g resolution without full enclosure.