Hengping FA2104 Advanced Analytical Balance

Overview

The Hengping FA2104 Advanced Analytical Balance is a Class I precision instrument engineered for high-accuracy mass measurement in regulated and research-intensive laboratory environments. It operates on the electromagnetic force compensation principle — a proven method wherein the downward gravitational force exerted by a sample is precisely counterbalanced by an electromagnetic current-generated upward force. This closed-loop feedback system ensures exceptional linearity, long-term stability, and minimal drift over time. Designed to meet stringent metrological requirements for analytical weighing, the FA2104 delivers 0.1 mg readability across its 220 g maximum capacity, with repeatability ≤ ±0.1 mg under controlled ambient conditions (20 ±2 °C, <60% RH, vibration-isolated bench). Its robust mechanical architecture includes a high-stiffness weighing sensor, thermally stable internal components, and a rigid aluminum alloy housing that minimizes thermal expansion effects. The balance conforms to national standard GB/T 26497–2011 for non-automatic weighing instruments and has been independently verified against all five essential electromagnetic compatibility (EMC) tests per GB/T 18268.31–2017, ensuring reliable operation in electromagnetically noisy settings such as QC labs adjacent to centrifuges or RF equipment.

Key Features

• Five-sided fully transparent glass draft shield — optimized for unobstructed sample visibility and rapid airflow equilibration, reducing settling time without compromising accuracy.
• LCD backlit display with intuitive open-menu interface — all functions accessible directly from front panel; no hidden submenus or configuration layers.
• Integrated below-balance weighing hook — enables density determination of irregular solids (when used with optional density kit), magnetic materials, or large-volume samples exceeding pan dimensions.
• Four-point linear calibration routine — performed externally using certified 200 g weights; supports traceable verification at multiple load points across the range.
• Comprehensive protection suite — includes full-range tare, overload cutoff, automatic fault diagnostics, and real-time error flagging (e.g., draft disturbance, temperature instability, or leveling misalignment).
• Adjustable leveling system — dual coarse/fine leveling feet paired with a precision bubble level indicator ensure optimal horizontal alignment prior to measurement — a prerequisite for achieving specified repeatability and linearity.

Sample Compatibility & Compliance

The FA2104 accommodates solid, liquid, and granular samples typical in pharmaceutical formulation, polymer characterization, catalyst loading, and geochemical analysis. Its Φ80 mm stainless-steel weighing pan and draft shield geometry support volumetric containers (e.g., beakers up to 100 mL), crucibles, filter papers, and small electronic components. For density applications, optional accessories include a density stand, sinker, and thermometer interface — enabling calculation per Archimedes’ principle with uncertainty propagation aligned with ISO 16269 and ASTM D792. Regulatory compliance extends to GLP-aligned workflows: RS232 output supports audit-trail-capable data logging systems compliant with FDA 21 CFR Part 11 when integrated with validated software. While not intrinsically 21 CFR Part 11–certified, the balance’s deterministic behavior, non-volatile memory retention of calibration logs, and timestamp-free raw output enable integration into validated electronic lab notebooks (ELNs) and LIMS platforms.

Software & Data Management

Equipped with a standard RS232 serial interface (9600 baud, N-8-1), the FA2104 transmits stabilized weight values, tare status, unit selection, and error codes in ASCII format. Output formatting is configurable via DIP-switch settings to match legacy lab printers or modern data acquisition systems. No proprietary drivers are required — native COM port communication allows seamless integration with Excel-based macros, LabVIEW VIs, Python scripts (via pySerial), or commercial QC software (e.g., Minitab Workspace, JMP Connect). All transmitted data include carriage return/line feed termination for parser compatibility. Internal memory retains last calibration date, integration time setting, and unit preference across power cycles — supporting continuity in multi-shift operations without reconfiguration.

Applications

This balance serves critical roles in quality control laboratories performing USP repeatability testing, ISO/IEC 17025–accredited reference material certification, and GMP-compliant batch release testing. Typical use cases include: gravimetric preparation of standard solutions (e.g., 100 ppm stock dilutions), loss-on-drying (LOD) assays per USP , active pharmaceutical ingredient (API) potency verification, catalyst mass dosing in heterogeneous catalysis R&D, ash content determination in coal and biomass samples (ASTM D3174), and microgram-level additive blending in semiconductor packaging formulations. Its environmental resilience and low susceptibility to electrostatic interference also make it suitable for cleanroom environments (ISO Class 7 and above) where static discharge mitigation is mandatory.

FAQ

What is the recommended warm-up time before first use?

For Class I accuracy per GB/T 26497–2011, a minimum 120-minute preheating period is required after initial power-on. Subsequent daily use requires ≥30 minutes of stabilization following idle periods exceeding 60 minutes.

Does the FA2104 support internal calibration?

No — it is externally calibrated only. A certified 200 g weight (Class E2 or better) is required for full-range verification and adjustment.

Can this balance be used for density measurement?

Yes — when fitted with the optional density measurement kit (including sinker, support rod, and temperature probe), it calculates solid density per ISO 1183-1 with resolution down to 0.001 g/cm³.

Is the RS232 interface opto-isolated?

No — the interface uses standard TTL-level signaling. For electrically noisy industrial environments, a galvanically isolated USB-to-RS232 converter is recommended.

What maintenance intervals are advised for long-term accuracy?

Daily: visual inspection of draft shield integrity and leveling bubble position. Weekly: cleaning of pan and shield with lint-free ethanol wipe. Annually: full metrological verification by an accredited calibration laboratory (ISO/IEC 17025).