A&D GR-200 Advanced Analytical Balance

Overview

The A&D GR-200 Advanced Analytical Balance is a high-stability, microgram-resolution weighing instrument engineered for precision laboratory applications requiring strict traceability and regulatory compliance. Utilizing electromagnetic force restoration (EMFR) technology, the GR-200 delivers consistent, drift-compensated measurements under variable ambient conditions. Its dual-range capability—operating at 0.1 mg readability across its full 210 g capacity—is optimized for routine analytical workflows in pharmaceutical QC labs, academic research facilities, and contract testing organizations. The balance integrates real-time environmental monitoring (temperature and humidity), enabling automatic recalibration when thermal or hygroscopic drift exceeds predefined thresholds—ensuring measurement integrity without manual intervention. Designed and manufactured in Japan, the GR-200 adheres to A&D’s proprietary quality control protocols aligned with JIS B 7721 and conforms to the metrological requirements of OIML R 76-1 Class I.

Key Features

• Internal motorized calibration system with built-in stainless-steel reference weights—enabling one-touch, fully automated calibration at user-defined intervals or upon environmental trigger.
• Front-access folding draft shield with low-profile ergonomic handle—minimizing footprint while maximizing interior volume (W × D × H: 205 × 210 × 245 mm) and reducing operator-induced vibration.
• Intelligent sensitivity adjustment: dynamically modulates damping response and filtering algorithms based on real-time detection of air currents and mechanical vibrations.
• 13 selectable weighing units (g, mg, oz, ct, etc.) plus built-in counting mode, percentage weighing, and net/gross/tare functions—supporting multi-standard operational environments.
• IP42-rated keypad and display with spill-resistant membrane—enhancing durability in wet or solvent-exposed lab settings.
• Dual-mode data logging: manual entry via front-panel keys or automatic timestamped capture triggered by stabilization event; all records include balance ID, operator code, date/time stamp, and calibration status.

Sample Compatibility & Compliance

The GR-200 accommodates standard analytical vessels (e.g., crucibles, weighing boats, volumetric flasks up to Ø120 mm) within its unobstructed weighing chamber. Its below-balance hook supports density determination using the optional AD-1653 buoyancy kit—enabling direct readout of solid sample density per ASTM D792 and ISO 1183-1 without external calculation. Regulatory documentation support includes GLP-compliant audit trails: each printed or exported record contains instrument serial number, calibration certificate ID, UTC timestamp, operator ID, and environmental parameters at time of measurement. The balance meets the data integrity criteria of FDA 21 CFR Part 11 when used with WinCT software configured for electronic signature and role-based access control.

Software & Data Management

WinCT v3.0—the OEM Windows-based communication suite—provides bidirectional control via RS-232C. It enables automated data export to Excel, Word, and LIMS platforms using configurable templates. Key capabilities include statistical analysis (mean, SD, RSD, min/max), trend charting over time, pass/fail limit checking against SOP-defined tolerances, and batch report generation compliant with ISO/IEC 17025 clause 7.7. All exported files retain embedded metadata (instrument firmware version, calibration history hash, environmental logs), satisfying internal QA audits and external accreditation assessments.

Applications

• Pharmaceutical formulation: active pharmaceutical ingredient (API) dispensing, excipient ratio verification, and stability study sample preparation.
• Materials science: catalyst loading quantification, thin-film deposition mass tracking, and nanoparticle yield calculation.
• Environmental testing: gravimetric analysis of filter media pre/post-exposure in PM2.5/PM10 sampling protocols (EPA Method IO-4.2).
• Food safety labs: moisture content determination per AOAC 950.46 and ash residue quantification following AOAC 942.05.
• Academic teaching: fundamental metrology instruction on uncertainty propagation, repeatability assessment, and calibration hierarchy traceability.

FAQ

Does the GR-200 support external calibration with traceable NIST-certified weights?
Yes—the balance accepts external calibration via the “External Cal” mode and stores calibration certificate IDs and dates for full traceability.
Can WinCT software be deployed in networked lab environments with centralized license management?
Yes—WinCT v3.0 supports concurrent multi-user deployment via floating license servers and integrates with Active Directory for unified authentication.
Is the RS-232C interface compatible with modern USB-to-serial adapters certified for Windows 10/11?
Yes—A&D provides WHQL-certified drivers for FTDI-based adapters; no third-party emulation layers are required.
What is the warm-up time required to achieve full specification performance?
The GR-200 reaches thermal equilibrium and full metrological readiness within 30 minutes after power-on under stable ambient conditions (20–25 °C, <60% RH).
How does the auto-calibration respond to rapid temperature fluctuations during HVAC cycling?
The internal thermistor array samples ambient temperature every 2 seconds; if ΔT ≥ 1.5 °C over 5 minutes, the system initiates preemptive recalibration before measurement drift exceeds ±0.1 mg.