A&D BH225TE Semi-Micro Analytical Balance

Overview

The A&D BH225TE Semi-Micro Analytical Balance is a high-precision mass measurement instrument engineered for laboratories requiring trace-level accuracy in regulated and research-intensive environments. Utilizing electromagnetic force compensation (EMFC) technology, the BH225TE delivers stable, drift-free measurements with a readability of 0.01 mg across its 220 g maximum capacity. Its semi-micro classification—bridging the gap between analytical and ultra-micro balances—makes it especially suited for applications demanding higher sensitivity than standard analytical balances but without the environmental constraints of sub-0.01 mg instruments. The balance operates within ISO 17025-accredited workflows and supports pharmacopeial compliance including USP (Balances), USP (Weighing on an Analytical Balance), and EP 2.1.6, ensuring metrological integrity in QC, API synthesis, reference standard preparation, and formulation development.

Key Features

• 5-inch full-color capacitive touchscreen interface with intuitive icon-driven navigation—enabling rapid method setup, user-defined workflows, and multilingual support (English, Japanese, Chinese, German, French, Spanish).
• Auto-sensing non-contact infrared door control: motorized draft shield doors open and close automatically upon approach, eliminating manual contact and minimizing thermal and mechanical disturbance to the weighing cell.
• Patented airless DC electrostatic neutralizer (standard on BH-T series): eliminates static-induced weighing errors in low-humidity environments or when handling insulating powders (e.g., APIs, excipients, nanomaterials) without generating airflow that disrupts stability.
• Perforated weighing pan design: reduces convective currents and thermal buoyancy effects, enhancing long-term repeatability under ambient lab conditions.
• AD-JUST™ automatic sensitivity adjustment: continuously monitors environmental drift (temperature, barometric pressure, vibration) and dynamically optimizes gain calibration to maintain consistent performance without user intervention.
• Impact detection (ISU function): logs mechanical shocks exceeding defined thresholds, triggering alerts and flagging potentially compromised measurement history for review.
• Integrated minimum weight (MinW) calculation per USP : automatically evaluates process variability and uncertainty to determine and enforce site-specific minimum sample weights—fully auditable and exportable.

Sample Compatibility & Compliance

The BH225TE accommodates diverse sample forms—including crystalline solids, lyophilized powders, viscous liquids in tared vessels, and small-volume volumetric flasks—within its Ø90 mm stainless-steel weighing pan. Its sealed EMFC sensor architecture resists corrosion from solvents and particulates. The balance meets ISO 9001 and ISO/IEC 17025 documentation requirements, with built-in GLP/GMP/GCP-compliant reporting: time-stamped records include operator ID, balance ID, calibration status, environmental metadata (optional external sensor integration), and raw measurement data. All outputs adhere to ISO/IEC 17025 Annex A.2 traceability standards and support 21 CFR Part 11 compliance when paired with A&D’s optional DataTrace software (audit trail, electronic signatures, role-based access control).

Software & Data Management

Embedded firmware supports customizable data export formats (CSV, TXT, XML) compatible with LIMS, ERP, and ELN systems. Users define print templates—including header fields, calculated values (e.g., % recovery, density, net/gross/tare), and regulatory footers. Daily and periodic verification routines (e.g., repeatability, eccentricity, linearity checks) are programmable and auto-log results with pass/fail flags. Historical data storage retains ≥10,000 weighings with timestamp, operator code, and environmental context. Optional USB or RS-232 connectivity enables direct transfer to PCs; Ethernet/Wi-Fi modules (add-on) allow remote monitoring and centralized fleet management via A&D’s BalanceLink™ platform.

Applications

• Pharmaceutical quality control: assay determination, reference standard weighing, blend uniformity testing, and residual solvent analysis sample prep.
• Academic and industrial R&D: catalyst loading, stoichiometric reagent dispensing, nanomaterial dosing, and gravimetric sorption studies.
• Food and cosmetics: nutrient fortification verification, preservative concentration validation, and emulsion phase ratio quantification.
• Environmental labs: filter weighing for PM2.5/PM10 analysis, microplastic isolation, and trace metal standard preparation.
• Contract manufacturing organizations (CMOs): fully documented, audit-ready weighing processes aligned with ICH Q7, EU GMP Annex 11, and WHO TRS 986.

FAQ

What is the difference between “semi-micro” and “analytical” balance classifications?
Semi-micro balances (e.g., BH225TE) offer 0.01 mg readability with capacities typically up to 220 g, optimized for higher sensitivity than standard analytical balances (0.1 mg) while maintaining robustness for routine lab use. They are not classified as ultra-micro (1 µg) or micro (10 µg) balances, which require stricter environmental controls.
Does the BH225TE support internal calibration with traceable standards?
Yes—the integrated motorized internal calibrator uses factory-traceable weights certified to ISO/IEC 17025. Calibration events are logged with date, time, weight value, and deviation; certificates are exportable in PDF format compliant with ISO 17025 Clause 7.7.
Can the minimum weight function be validated per USP without external software?
Yes—the instrument calculates minimum weight in real time using built-in repeatability testing (n=10) and uncertainty modeling per USP Equation 1. Results are displayed, stored, and printable without third-party tools.
Is the touchscreen resistant to common lab solvents and disinfectants?
The Gorilla Glass™-reinforced display is rated IP65 for dust/water resistance and withstands repeated wiping with 70% ethanol, isopropanol, and quaternary ammonium solutions per manufacturer specifications.
How does the airless electrostatic neutralizer differ from conventional ionizing bars?
Unlike airflow-dependent ionizers, the BH-T series’ solid-state DC neutralizer emits balanced positive/negative ions without forced convection—eliminating turbulence-induced instability while achieving >99.9% static decay in <2 seconds for typical pharmaceutical powders.