Longteng FBA-200-3 Explosion-Proof Precision Balance
| Brand | Longteng |
|---|---|
| Origin | Liaoning, China |
| Model | FBA-200-3 |
| Maximum Capacity | 200 g |
| Readability | 0.001 g |
| Repeatability | ±0.001 g |
| Calibration | Automatic |
| Protection Rating | Ex dII BT4 |
| Application Zone | Zone 1 & Zone 2 (IIA/IIB, T4) |
| Pan Size | 120 mm diameter (standard) |
| Instrument Type | Precision Balance |
Overview
The Longteng FBA-200-3 Explosion-Proof Precision Balance is an intrinsically safe weighing instrument engineered for high-accuracy mass measurement in hazardous environments where flammable gases, vapors, or combustible dusts may be present. It operates on electromagnetic force compensation (EMFC) principle — a standard methodology for high-stability precision balances — delivering consistent, drift-resistant measurements under dynamic industrial conditions. Designed and manufactured in accordance with GB 3836.1–2010 (equivalent to IEC 60079-0) and GB 3836.2–2010 (IEC 60079-1), the unit bears the explosion protection marking Ex dII BT4, certifying its suitability for use in Group IIA and IIB gas atmospheres with temperature class T4 (surface temperature ≤135 °C). This makes it appropriate for Zone 1 and Zone 2 classified areas per IEC 60079-10-1, including munitions assembly lines, propellant formulation labs, aerospace pyrotechnic testing facilities, and commercial explosives manufacturing plants.
Key Features
- Robust flameproof enclosure constructed from cast aluminum alloy with reinforced sealing gaskets and explosion-relief venting architecture.
- EMFC sensor system derived from Longteng’s JD and ESK series platforms, optimized for thermal stability and long-term calibration retention.
- Automatic internal calibration with motor-driven weight actuation — initiated manually or scheduled via time-based triggers.
- Real-time overload and eccentric load detection with audible/visual alerts to prevent mechanical stress on the load cell.
- RS232 interface compliant with standard ASCII protocol for integration into LIMS or MES systems; optional USB-to-serial adapter available.
- Front-panel keypad with tactile feedback and backlit LCD display (128 × 64 pixels) supporting dual-unit display (g/mg) and tare function with memory retention.
- Adjustable leveling feet with bubble level indicator and anti-vibration rubber feet for stable operation on uneven surfaces.
Sample Compatibility & Compliance
The FBA-200-3 accommodates standard laboratory samples, small explosive charges, pyrotechnic compositions, and solid propellant granules within its 200 g capacity and 120 mm diameter stainless-steel weighing pan. Its design conforms to ISO 9001 quality management requirements and supports GLP-compliant workflows through traceable calibration records and audit-ready operational logs. While not certified to ATEX Directive 2014/34/EU or UKCA, the unit meets Chinese national explosion-proof standards (GB 3836) and may be deployed internationally subject to local authority acceptance and supplementary risk assessment per IEC 61511 or NFPA 495. It is not intended for use in Zone 0 or dust-explosion environments (Group III) without additional certification.
Software & Data Management
Data output follows NIST-traceable formatting conventions. The balance supports bidirectional communication using standard command sets (e.g., “S” for stable weight readout, “T” for tare, “Z” for zero). When connected to host software, it enables timestamped data logging with operator ID tagging (via external authentication layer), batch ID assignment, and export to CSV or Excel-compatible formats. Audit trail functionality — including calibration events, parameter changes, and error codes — is retained in non-volatile memory for ≥10,000 entries. For regulated environments, integration with 21 CFR Part 11-compliant software platforms requires third-party validation of the host application; the balance itself provides raw data integrity but does not implement electronic signature or role-based access control natively.
Applications
- Weighing of energetic materials during R&D and production of solid rocket propellants, detonators, and initiators.
- Quality control of explosive formulations in compliance with MIL-STD-1312 or GJB 5890.
- In-process verification of charge mass consistency in artillery shell loading and missile warhead assembly.
- Calibration reference mass handling in metrology labs operating under hazardous area constraints.
- Weighing of catalysts, oxidizers, and binder components in controlled atmosphere gloveboxes interfaced with explosion-proof enclosures.
FAQ
What does the Ex dII BT4 marking signify?
It indicates flameproof (d) protection for use in explosive gas atmospheres of Group II (industrial gases), Class B (ethylene-level ignition sensitivity), and Temperature Class T4 (maximum surface temperature ≤135 °C).
Is this balance suitable for use in Zone 0 environments?
No — the FBA-200-3 is certified only for Zone 1 and Zone 2 applications per IEC 60079-10-1.
Does the balance support external calibration with certified weights?
Yes — manual external calibration is supported using Class E2 or better weights traceable to national standards; procedure is documented in the user manual.
Can the RS232 interface transmit data to a Windows-based LIMS?
Yes — provided the host system implements standard serial communication protocols and handles ASCII-formatted weight strings with carriage return/line feed termination.
What maintenance intervals are recommended for optimal performance?
Visual inspection every 3 months; full functional verification and sensor linearity check annually; recalibration required after any mechanical impact, environmental shock, or relocation.
