AND A&D Ultra-Micro Analytical Balance BM-5 (1 µg Readability, 5.2 g Capacity)
| Brand | AND/A&D |
|---|---|
| Origin | Japan |
| Model | BM-5 |
| Maximum Capacity | 5.2 g |
| Minimum Readability | 1 µg (0.001 mg) |
| Repeatability | ±0.0012 mg (at 1 g load) |
| Linearity | ±0.010 mg |
| Stabilization Time (FAST mode) | ~10 s |
| Dimensions (W×D×H) | 259 × 466 × 326 mm |
| Net Weight | ~10 kg |
| Power Supply | AC 100 V (±10%, −15%), 50/60 Hz, ~30 VA |
| Interfaces | USB (Quick USB, Windows 10 compatible), RS-232C (D-Sub 9-pin male) |
Overview
The AND A&D BM-5 is an ultra-micro analytical balance engineered for laboratories requiring trace-level mass quantification with metrological integrity. Operating on electromagnetic force compensation (EMFC) principle, it delivers stable, drift-compensated measurements at a minimum readability of 1 µg (0.001 mg) across its full 5.2 g capacity range. Designed and manufactured in Japan, the BM-5 meets the stringent demands of pre-analytical workflows in elemental analysis (e.g., ICP-MS sample preparation), high-sensitivity gravimetric assays, and micro-dosage formulation validation. Its architecture integrates patented anti-static technologies—including a DC-type ionizer that neutralizes surface charge without airflow—and a conductive glass draft shield with embedded metal film, eliminating electrostatic interference without compromising weighing chamber accessibility or measurement stability.
Key Features
- Patented static-free ionization system: DC-driven, zero-airflow ion generator prevents particle dispersion and eliminates electrostatic drift during microgram-scale weighing.
- Single-pane conductive draft shield: Tempered glass with sputter-coated metal layer provides ESD shielding while enabling unobstructed chamber access—no double-glass design required.
- Modular weighing chamber: Removable internal partition allows direct placement of tall vessels (e.g., volumetric flasks, tall beakers) up to 320 mm height without compromising repeatability.
- Integrated internal calibration: Motorized, factory-traceable reference mass ensures automatic recalibration upon power-up, temperature shift (>1.5 °C), or user-initiated command—fully compliant with ISO 17025 traceability requirements.
- Dual-port connectivity: Native USB (Quick USB protocol, plug-and-play with Windows 10) and RS-232C (D-Sub 9-pin male) support seamless integration into LIMS, ELN, and automated QC systems with configurable data output formats (ASCII, SICS).
- User-access control: Password-protected operation modes restrict access to calibration, unit switching, and configuration settings—supporting GLP/GMP audit readiness per FDA 21 CFR Part 11 Annex 11 requirements.
Sample Compatibility & Compliance
The BM-5 accommodates diverse sample forms including powdered pharmaceutical actives, filter media (e.g., PTFE, quartz fiber), microcentrifuge tubes, crucibles, and MEMS components. Its standard accessories include SUS316 stainless steel weighing pans (φ8/12/15 mm), ABS resin filter pans (φ50/95 mm), and gold-plated tweezers (AX-MX-36) optimized for low-particulate handling. The balance conforms to international metrological standards: OIML R76-1 (Class U1), ISO 9001, and JIS B 7721. Its environmental operating range (15–30 °C, 20–80% RH non-condensing) supports deployment in controlled laboratory environments aligned with USP , EP 2.1.6, and ASTM E898-22 specifications.
Software & Data Management
The BM-5 supports real-time data streaming via AD-1688 Data Logger (included), enabling time-stamped, operator-annotated records with metadata (date/time, weight, unit, stability flag). All USB outputs are timestamped and include checksum verification. When connected to validated third-party software (e.g., LabWare LIMS, Thermo Fisher SampleManager), the balance satisfies ALCOA+ principles—ensuring data attribution, legibility, contemporaneity, originality, accuracy, completeness, consistency, endurance, and availability. Audit trail functionality (enabled via password-protected admin mode) logs all configuration changes, calibration events, and user logins—meeting GxP documentation expectations.
Applications
- Pharmaceutical development: Quantitative recovery studies of nanogram-level APIs; residual solvent gravimetric determination post-lyophilization.
- Environmental monitoring: Weighing of air particulate filters (PM₂.₅/PM₁₀) per EPA Method IO-3.2 and ISO 12103-1.
- Materials science: Mass change tracking in thin-film deposition (e.g., ALD, CVD) and catalyst loading validation.
- Reference material certification: Preparation of certified reference materials (CRMs) under ISO Guide 34, where uncertainty budgets require sub-µg repeatability contributions.
- Microelectronics: Gravimetric verification of solder paste volume dispensed onto PCB substrates.
FAQ
What is the recommended environmental class for optimal BM-5 performance?
The BM-5 achieves rated repeatability only in Class II or better vibration-controlled environments (ISO 27892:2021), with ambient temperature stability ≤0.5 °C/h and airflow <0.2 m/s at the weighing chamber aperture.
Does the BM-5 support external motorized draft shield operation?
No—the BM-5 uses manually operated cross-sliding doors (left-hand open/right-hand close); no optional motorized shield is available.
Can the internal calibration mass be verified independently?
Yes—AND provides optional NIST-traceable external check weights (class E2, 1 g and 5 g) for periodic verification per USP and ISO/IEC 17025 clause 6.5.2.
Is the Quick USB interface compatible with macOS or Linux?
The Quick USB protocol is Windows-native; macOS and Linux users must employ RS-232C with appropriate terminal emulation or vendor-provided drivers.
How does the conductive draft shield differ from conventional antistatic coatings?
Unlike carbon-doped acrylic shields, the BM-5’s sputter-deposited metal film maintains surface resistivity <10⁴ Ω/sq across 10⁶ operational cycles—verified per IEC 61340-5-1.
