A&D GF Series Precision Electronic Balance

Overview

The A&D GF Series Precision Electronic Balance is an entry-level yet rigorously engineered analytical and semi-micro balance platform designed for routine quality control, laboratory education, and production line verification in regulated environments. Built upon A&D’s proprietary SHS (Super Hybrid Sensor) weighing technology, the GF series employs a monolithic electromagnetic force compensation transducer architecture with optimized thermal mass distribution and dynamic damping control—enabling stabilization of readings within one second under typical ambient lab conditions (20–25 °C, <60% RH). Unlike conventional strain-gauge or load-cell-based platforms, the SHS sensor delivers high signal-to-noise ratio and exceptional long-term repeatability without mechanical hysteresis. The GF series operates on a dual-range architecture: GF-200 and GF-300 models provide 0.001 g readability up to 210 g and 310 g capacity respectively; GF-2000 and GF-3000 extend capacity to 2100 g and 3100 g at 0.01 g resolution—making them suitable for both fine-powder formulation and bulk material verification tasks.

Key Features

• SHS electromagnetic force restoration sensor with ≤1 s stabilization time and internal auto-calibration triggered by temperature shift (>1.5 °C) or physical relocation
• High-luminance fluorescent display (15 mm digit height) with anti-glare polarized filter, readable under low-light or high-ambient-brightness conditions
• IP54-rated enclosure—dust-resistant and protected against water splashes from any direction, enabling operation near wet benches or humidified rooms
• Multi-mode weighing: standard mass, piece counting (with ACAI algorithm for enhanced accuracy across heterogeneous part populations), percentage weighing, animal (dynamic) weighing, and comparative weighing with programmable upper/lower tolerance limits
• Configurable interval data logging: time-stamped weight capture at user-defined intervals (2 s, 5 s, 10 s, 30 s, 1 min, 2 min, 5 min, 10 min)
• Onboard memory stores 40 raw weight entries plus 20 unit-weight values (for counting calibration), each tagged with date/time stamp and operator ID field (via WinCT)

Sample Compatibility & Compliance

The GF Series accommodates standard laboratory sample vessels—including weighing boats, crucibles, beakers, and petri dishes—within its 120 mm × 120 mm stainless-steel pan. Optional accessories include draft shields (sold separately), density kits (for solid/liquid density determination per ASTM D792), and animal weighing cages. All units are manufactured in A&D’s ISO 9001-certified facilities in Japan and undergo factory calibration traceable to JCSS (Japan Calibration Service System), which maintains equivalence with BIPM SI standards. The device supports full GLP documentation workflows via WinCT software, including electronic signatures, audit trails, and metadata tagging (environmental temperature/humidity logs where connected to external sensors). While the hardware itself does not embed 21 CFR Part 11 controls, WinCT v3.x implements role-based access, electronic signature capture, and immutable audit logs compliant with FDA expectations for regulated QC labs.

Software & Data Management

WinCT v3.x is A&D’s dedicated Windows-based communication and data management suite, supporting real-time bidirectional communication over RS-232C. It enables automated export of weight data to CSV, Excel, or LIMS-compatible XML formats, with configurable field mapping (e.g., sample ID, batch number, operator code). The software enforces structured GLP record generation: each exported entry includes instrument serial number, calibration status flag, ambient temperature (if monitored), timestamp (with millisecond precision), and user authentication token. Data integrity is preserved through write-once archive mode and SHA-256 hash validation of exported files. WinCT also supports printer driver integration for direct label printing (e.g., barcode-labeled sample tags) and optional Ethernet-to-RS232 gateways for networked deployment.

Applications

• Pharmaceutical QC: Raw material identity verification, tablet weight uniformity testing (per USP <905>), excipient blending consistency checks
• Food & Beverage: Portion control validation, ingredient dosing accuracy audits, shelf-life stability study sample preparation
• Academic Teaching Labs: Stoichiometric reaction setup, gravimetric analysis exercises, density determination experiments
• Materials Science: Powder flow characterization support (bulk density measurement), catalyst loading verification, composite resin mixing ratios
• Environmental Testing Labs: Filter weight gain analysis for particulate matter (PM₁₀/PM_2.5) quantification per ISO 12103-1

FAQ

Does the GF Series support external calibration weights?
Yes—the GF series accepts Class M2 or better external calibration masses. Internal calibration is performed automatically; external calibration requires manual initiation via front-panel menu and is recommended after installation, major environmental shifts, or periodic verification per ISO/IEC 17025 clause 6.5.
Is WinCT software validated for GxP use?
WinCT v3.x includes documented IQ/OQ protocols and supports 21 CFR Part 11 compliance when deployed with Windows domain authentication, encrypted local storage, and enabled audit trail settings. Full validation packages are available under NDA from A&D’s Regulatory Affairs division.
Can the GF balance interface with LIMS systems?
Yes—via WinCT’s configurable ASCII output mode or direct ODBC connectivity using third-party middleware (e.g., LabVantage, Thermo SampleManager). Raw data fields are fully mappable to LIMS schema elements.
What is the maximum permissible deviation during internal recalibration?
Per A&D Technical Specification TS-GF-2023 Rev.2, internal recalibration must yield deviation ≤±0.5 d (where d = readability) across the full span. If deviation exceeds this threshold, the unit displays “CAL ERROR” and halts weighing until service intervention.
Are draft shields included as standard equipment?
No—draft shields are optional accessories (model DS-GF). Their use is strongly recommended for measurements below 10 mg or in non-ISO Class 5 environments.