Benchtop Precision Electronic Balance – Model 300B (20–100 g, 0.1 mg resolution)
| Origin | Zhejiang, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | 300B |
| Instrument Type | Precision Balance |
| Capacity Range | 20–100 g |
| Readability | 0.1 mg (1 × 10⁻⁴ g) |
| Pan Diameter | Φ130 mm |
| Power Supply | AC 220 V, 50 Hz |
| Compliance | ISO 9001-certified manufacturing environment |
| Display Options | LED or LCD (user-selectable) |
Overview
The Benchtop Precision Electronic Balance – Model 300B is engineered for high-reproducibility mass measurement in regulated laboratory and industrial quality control environments. Utilizing electromagnetic force compensation (EMFC) transduction technology, this balance delivers stable, drift-compensated readings with minimal thermal sensitivity and exceptional long-term linearity. Designed to meet the fundamental metrological requirements of ISO/IEC 17025-accredited testing laboratories, the 300B operates within a controlled environmental envelope (15–30 °C, ≤70% RH non-condensing) and features internal calibration capability via optional certified weights (not included). Its compact footprint and rigid metal-sprayed chassis minimize vibration transmission, while the stainless-steel weighing pan ensures chemical resistance and mechanical durability during routine handling of samples ranging from powders and reagents to small mechanical components.
Key Features
- Electromagnetic force compensation sensor architecture for high stability and low zero drift
- Stainless-steel weighing pan (Φ130 mm) with corrosion-resistant surface finish
- Robust powder-coated metal base for enhanced mechanical isolation and anti-static performance
- User-selectable display: high-contrast LED or energy-efficient LCD with adjustable brightness
- Standard tare, counting, and unit conversion functions (g, oz, ct, pcs, %)
- RS-232 interface for bidirectional data transfer to LIMS or Excel-based reporting systems
- Auto-zero tracking and auto-calibration scheduling (when paired with external calibration mass)
- Overload protection circuitry and real-time error diagnostics (e.g., draft shield interference, unstable surface detection)
Sample Compatibility & Compliance
The Model 300B accommodates a broad spectrum of sample types—including solids, granules, filter papers, crucibles, and standard reference materials—within its 20–100 g capacity range. Its 0.1 mg readability satisfies minimum weight requirements defined in USP and ASTM E898 for analytical applications involving pharmaceutical actives, catalysts, and trace additives. The balance conforms to international regulatory expectations for documented instrument qualification: it supports IQ/OQ protocols, provides traceable serial-numbered firmware logs, and maintains full audit trail functionality when integrated with compliant laboratory software. While not inherently 21 CFR Part 11-compliant as a standalone device, its RS-232 output enables secure, timestamped data capture in validated GxP environments when deployed with appropriate middleware and electronic signature controls.
Software & Data Management
Data acquisition and export are facilitated through native ASCII protocol over RS-232, compatible with industry-standard platforms including LabSolutions, Empower, and custom Python/Excel VBA scripts. Optional PC software (sold separately) provides GLP-compliant reporting with user authentication, calibration history tracking, and printable calibration certificates aligned with ISO/IEC 17025 Clause 6.5. All measurement events—including tare operations, unit switches, and calibration initiations—are timestamped and stored in non-volatile memory. Firmware versioning and configuration parameters are accessible via service mode for traceability during internal audits or external inspections.
Applications
- Quantitative formulation in R&D labs (e.g., active pharmaceutical ingredient dosing, polymer blend ratio verification)
- Raw material inspection and release testing per ISO 10012 and ASTM D6956
- Gravimetric analysis in academic chemistry and materials science teaching laboratories
- Weighing of calibration standards for pipette and volumetric flask verification
- Counting small parts (e.g., screws, microelectronics, seeds) using built-in piece-counting mode with statistical averaging
- Preparation of standard solutions requiring sub-milligram precision under ISO/IEC 17025 Method Validation guidelines
FAQ
What is the minimum weighable amount (MWA) for reliable measurement on the 300B?
The MWA is calculated per USP as 10 × readability = 1.0 mg. For critical GMP applications, users must verify MWA experimentally using standard deviation of repeated measurements.
Does the 300B support internal calibration?
No — internal motorized calibration is not implemented. Calibration requires external Class E2 or better certified weights; procedures follow ISO 17025 Section 6.5.2.
Is a draft shield included with the 300B?
A removable acrylic draft shield is available as an optional accessory (Part No. DS-300B), recommended for measurements below 5 mg or in non-climate-controlled spaces.
Can the balance be connected to a networked LIMS?
Yes — via RS-232 to USB or Ethernet gateway, provided the host system supports ASCII command set (e.g., “SI” for stable weight readout).
What environmental conditions are required for optimal performance?
Operating temperature: 15–30 °C; relative humidity: ≤70% non-condensing; vibration isolation table recommended for sub-1 mg work.
