Hengping JA31002 Precision Balance

Overview

The Hengping JA31002 Precision Balance is a high-stability, microprocessor-controlled analytical balance engineered for routine laboratory and industrial quality control applications requiring reliable mass measurement up to 3100 g with 0.01 g readability. Built upon an electromagnetic force compensation (EMFC) transducer architecture—widely recognized for superior linearity, temperature stability, and long-term drift resistance—the JA31002 delivers consistent performance under variable ambient conditions. Its Class II accuracy classification complies with OIML R76 requirements for non-automatic weighing instruments used in commercial and regulated environments. Designed as an evolution of the FA/JA platform, the JA31002 integrates robust mechanical construction with intelligent firmware logic to support repeatable daily operations across manufacturing, pharmaceutical QC labs, educational institutions, and materials testing facilities.

Key Features

• Electromagnetic force compensation (EMFC) sensor system ensuring high reproducibility and minimal zero drift over extended operation cycles
• External calibration capability with built-in calibration prompts and linear four-point calibration procedure for enhanced traceability
• Adjustable integration time (2 s / 4 s / 8 s) to optimize measurement stability for low-density or vibration-sensitive samples
• Dual-mode weighing interface: top-loading pan (Φ160 mm stainless steel) and optional below-balance hook for density determination or magnetic sample handling
• Comprehensive overload protection circuitry and automatic fault diagnostics during startup and operation
• Full-range tare function with auto-zero tracking and real-time weight stabilization indicator
• Integrated RS232 serial interface compliant with standard ASCII protocol for bidirectional communication with PCs, label printers, or LIMS systems
• Large-leveling feet with integrated bubble level indicator enabling rapid horizontal alignment on uneven surfaces

Sample Compatibility & Compliance

The JA31002 accommodates a broad range of sample types—including bulk solids, packaged goods, metallic components, and irregularly shaped objects—thanks to its oversized weighing pan and optional under-hook configuration. Its EMFC sensor design eliminates ferromagnetic interference, making it suitable for direct weighing of iron-based materials without signal distortion. The unit meets electromagnetic compatibility (EMC) requirements per IEC/EN 61326-1 (5 test items), ensuring stable operation in shared laboratory or production floor environments. While not certified for GMP/GLP environments out-of-the-box, its data output protocol supports audit-trail-capable software integration; users may configure external recording systems to satisfy 21 CFR Part 11 requirements for electronic records and signatures when paired with validated drivers.

Software & Data Management

Data export is facilitated via native RS232 connectivity using standard ASCII formatting (e.g., “S”). No proprietary software is bundled; however, the device is compatible with common third-party data acquisition platforms including LabX (Mettler Toledo), WinWedge (TAL Technologies), and custom Python/Node.js serial parsers. All weight values are transmitted with timestamp-ready formatting, supporting manual or automated logging into Excel, SQL databases, or cloud-based QA dashboards. Firmware supports user-defined unit conversion (g, kg, oz, ct, lb, etc.) and cumulative weighing mode for batch totalization—commonly applied in raw material dispensing and formulation workflows.

Applications

• Quality assurance of incoming raw materials and finished goods in food, chemical, and polymer industries
• Batch weighing and recipe verification in pharmaceutical excipient handling and tablet coating processes
• Educational demonstrations of mass conservation, density calculation (with sinker kit), and statistical process control (SPC)
• Calibration reference checks for lower-capacity balances within metrology hierarchies
• Inventory management and parcel dispatch verification where sub-10 mg repeatability is required at multi-kilogram scale

FAQ

What is the recommended warm-up time before first use?
For optimal thermal equilibrium and sensor stability, the JA31002 requires a minimum 60-minute power-on warm-up period prior to initial calibration or critical measurements.
Does the balance support internal calibration?
No—the JA31002 is configured for external calibration only, requiring certified weights traceable to national standards (e.g., NIST, PTB).
Can this balance be used in a regulated GxP environment?
Yes—with appropriate procedural controls, documented calibration records, and validated data capture software, the JA31002 can support GLP/GMP-aligned workflows when deployed as part of a broader quality system.
Is the RS232 interface opto-isolated?
No—the interface is electrically coupled and intended for short-distance connections (<2 m) to grounded host devices; use of shielded cables is recommended in noisy electrical environments.
What maintenance is required to sustain metrological performance?
Routine cleaning of the weighing pan and draft shield (if installed), periodic verification against calibrated reference masses, and annual verification by an accredited service provider are advised per ISO/IEC 17025 guidelines.