Hengping JA3003 Precision Balance (0.001 g readability)

Overview

The Hengping JA3003 Precision Balance is an electromagnetic force compensation (EMFC) based analytical instrument engineered for high reproducibility and long-term stability in routine laboratory weighing tasks. Operating on the principle of electromagnetic force restoration—where a coil suspended in a permanent magnetic field generates a counterforce proportional to the mass placed on the pan—the JA3003 delivers consistent 0.001 g (1 mg) readability across its full 500 g capacity range. Designed to meet ISO/IEC 17025 and USP general requirements for analytical balance performance, it is classified as a Class II precision balance per OIML R 76-1, supporting applications where moderate environmental control (20 °C ±7.5 °C, 40–80% RH) is feasible. Its robust mechanical design includes a five-sided transparent draft shield, integrated leveling bubble, oversized leveling feet, and internal overload protection—ensuring operational integrity under variable lab conditions without compromising measurement fidelity.

Key Features

• Electromagnetic force compensation sensor architecture delivering stable 1 mg readability and ≤1 mg repeatability under controlled ambient conditions
• Five-sided acrylic draft shield with optimized airflow management to minimize convection-induced drift during static weighing
• Integrated bubble level and dual-axis coarse/fine leveling system enabling rapid, repeatable horizontal alignment
• LCD backlit display with intuitive menu navigation—no hidden parameter layers or firmware-dependent configuration trees
• External calibration support using certified Class M2 or better weights (200 g standard supplied); linear four-point calibration routine ensures linearity compliance across full span
• RS232 serial interface compliant with standard ASCII protocol for direct connection to PCs, label printers, or LIMS systems—no proprietary drivers required
• Built-in below-balance weighing hook for density determination (with optional density kit), magnetic sample handling, or suspended container taring
• Configurable integration time (2 / 4 / 8 s) and auto-stabilization logic to adapt to sample volatility, operator workflow, and ambient vibration profiles
• Full-range tare, piece counting, cumulative weighing, and multi-unit conversion (g, oz, ct, dwt, grain, etc.) with user-defined decimal place retention
• Self-diagnostic startup sequence, over-load error prevention, and automatic zero-tracking compensation during warm-up phase

Sample Compatibility & Compliance

The JA3003 accommodates solid, granular, and low-viscosity liquid samples within standard laboratory containers (up to Φ110 mm diameter). Its draft shield geometry supports volumetric flasks, crucibles, and Petri dishes while maintaining visibility and accessibility. The balance complies with EMC Directive 2014/30/EU (tested to EN 61326-1:2013 for immunity and emission), and its construction adheres to IP42-rated ingress protection for dust resistance. While not inherently 21 CFR Part 11 compliant, audit-ready operation is achievable when paired with validated third-party data capture software that enforces electronic signature, change history, and role-based access controls. Calibration documentation—including external weight traceability to NIM (National Institute of Metrology, China) or equivalent national metrology institute—is required for ISO/IEC 17025 accreditation.

Software & Data Management

Data output follows standard RS232 asynchronous communication at 9600 baud, 8N1 format, transmitting ASCII-formatted weight strings (e.g., “+000.1234 g”) upon stabilization. No embedded operating system or firmware-based data storage is present; all logging must occur externally. Compatible with generic terminal emulators (e.g., Tera Term), Excel VBA macros, or LIMS middleware via COM port abstraction. For regulated environments, users must implement procedural controls—including daily verification with check weights, scheduled recalibration intervals (typically every 24–72 hours depending on usage frequency), and logbook entries per GLP Annex 11 guidance. Firmware updates are distributed exclusively through authorized Hengping service centers and require physical USB-to-RS232 adapter intervention.

Applications

The JA3003 serves as a primary weighing instrument in quality control laboratories performing raw material verification (ASTM E29, ISO 80000-1), formulation batch release (pharmaceutical excipient weighing per USP ), academic teaching labs (general chemistry stoichiometry, gravimetric analysis), food testing (moisture loss on drying per AOAC 950.46), and metallurgical sample preparation (alloy composition pre-digestion). Its 500 g capacity and 1 mg resolution make it suitable for volumetric flask filling, filter paper + residue weighing, tablet hardness test sample prep, and calibration standard handling—provided environmental fluctuations remain within Class II tolerances.

FAQ

What is the recommended warm-up time before first use?
The JA3003 requires a minimum 60-minute power-on stabilization period prior to initial calibration or critical weighing, as specified in its technical manual for Class II balance operation.
Can this balance be used in a fume hood or near HVAC vents?
No. Drafts exceeding 0.2 m/s induce buoyancy errors and destabilize EMFC feedback loops; placement on vibration-isolated benches away from air currents is mandatory.
Is internal calibration available?
No. The JA3003 supports external calibration only, requiring traceable weights (200 g nominal, Class M2 or higher) and manual initiation via front-panel key sequence.
Does the RS232 interface support real-time streaming mode?
Yes—continuous output is enabled via command “S” (stream), transmitting stabilized values at user-defined intervals; no handshake protocol is implemented.
What maintenance is required beyond periodic calibration?
Daily cleaning of the pan and shield interior with lint-free ethanol wipes; biannual inspection of leveling feet and draft shield hinges; annual verification of zero-point drift and eccentric load error per ISO 17025 clause 6.5.2.