Longteng FBA-K Series Explosion-Proof Precision Balance

Overview

The Longteng FBA-K Series Explosion-Proof Precision Balance is an industrial-grade weighing instrument engineered for safe, reliable, and traceable mass measurement in hazardous environments where flammable gases, vapors, or combustible dusts may be present. Designed in strict compliance with international explosion protection standards, the FBA-K series employs a robust flameproof enclosure (Ex d II BT4) conforming to IEC 60079-1 and GB 3836.1–2010. Its core sensing technology utilizes electromagnetic force compensation (EMFC), derived from Longteng’s JD and ESK platform architectures, ensuring high stability, low drift, and long-term metrological integrity under dynamic operational conditions. Unlike general-purpose laboratory balances, the FBA-K integrates intrinsic safety by design—its electrical components are fully isolated within a certified cast-iron housing capable of containing internal explosions without igniting surrounding atmospheres. This makes it suitable for continuous operation in classified zones where standard electronics would pose unacceptable ignition risks.

Key Features

• Flameproof enclosure certified to Ex d II BT4 per IEC 60079-1, enabling safe deployment in Zone 1 and Zone 2 hazardous locations (Group IIA/IIB, T4 temperature class)
• Electromagnetic force compensation (EMFC) load cell architecture delivering high repeatability (±0.1 g to ±0.5 g, depending on model) and minimal thermal drift
• Automatic internal calibration with motor-driven weight actuation, eliminating manual intervention in classified areas
• Wide capacity range across eight configurations—from 10 kg to 60 kg—with readability options of 0.1 g or 0.5 g
• Large stainless-steel weighing pan (390 × 350 mm) optimized for bulky industrial samples including munition casings, propellant batches, and aerospace subassemblies
• IP65-rated front panel with sealed membrane keypad and corrosion-resistant housing for operation in high-humidity or chemically aggressive environments
• RS232 and optional Ethernet interface supporting integration into centralized QC data acquisition systems

Sample Compatibility & Compliance

The FBA-K series accommodates diverse sample forms encountered in defense, pyrotechnics, and energetic materials manufacturing—including solid propellants, detonator assemblies, rocket motor components, and bulk explosive precursors. Its mechanical design avoids spark-generating materials (e.g., aluminum alloys or plastic housings), and all external surfaces are grounded via integrated copper braid terminals. The balance meets requirements for traceability under ISO/IEC 17025:2017 for calibration laboratories and supports GLP-compliant workflows when paired with audit-trail-enabled software. While not intrinsically safe (Ex i), its flameproof construction satisfies ATEX Directive 2014/34/EU Annex II conformity assessment procedures for Category 2 equipment. Documentation includes full EU Declaration of Conformity, test reports from nationally accredited explosion protection laboratories, and calibration certificates traceable to NIM (National Institute of Metrology, China).

Software & Data Management

The FBA-K operates with Longteng’s proprietary BalanceLink™ firmware, supporting configurable data logging (time-stamped weight records, operator ID, environmental metadata), password-protected parameter locking, and export via CSV or XML over serial or TCP/IP. When connected to compliant enterprise systems, it supports 21 CFR Part 11–compliant electronic signatures and audit trails through third-party LIMS integration (e.g., LabWare, Thermo Fisher SampleManager). Firmware updates are delivered via secure USB boot mode with SHA-256 signature verification. No cloud connectivity is enabled by default; all data remains on-premise unless explicitly configured by qualified IT personnel adhering to site-specific cybersecurity policies.

Applications

• Weighing of explosive formulations and batched propellants during loading operations in ordnance manufacturing facilities
• Final inspection and quality control of guided missile components, warhead assemblies, and fuzing systems
• Mass verification of aerospace composite structures prior to static fire testing
• Inventory reconciliation and raw material intake in commercial blasting agent production plants
• Calibration transfer and reference standard handling in accredited metrology labs serving defense contractors
• Process validation support for GMP-aligned pharmaceutical excipient blending where solvent vapors may be present

FAQ

What hazardous area classifications does the FBA-K series support?
It is certified for Zone 1 and Zone 2, Group IIA and IIB, with temperature classification T4 — suitable for environments containing propane, ethylene, hydrogen sulfide, and similar gas/vapor mixtures.
Is external calibration required after installation?
No. Each unit performs automatic internal calibration at user-defined intervals or upon power-up; however, periodic verification using NIST-traceable weights is recommended per ISO 9001 and internal QA protocols.
Can the balance interface with SCADA or MES systems?
Yes — via RS232 (standard) or optional Ethernet module, supporting Modbus RTU/TCP and ASCII command protocols for seamless integration into industrial automation infrastructures.
Does the FBA-K meet FDA or EU GMP requirements for use in regulated manufacturing?
While not a “GMP-certified device” per se, its design, documentation, and data integrity features align with Annex 11 (EU GMP) and 21 CFR Part 11 expectations when deployed within validated processes and supported by appropriate SOPs and change control.
What maintenance intervals are recommended for explosion-proof integrity?
Visual inspection of flamepath surfaces, gasket integrity, and grounding continuity must occur before each shift in critical applications; formal enclosure integrity testing (e.g., pressure decay) is advised annually by an IECEx-certified service technician.