SOPOTOP JA1003 / JA2003 / JA3003 Precision Analytical Balance Series

Overview

The SOPOTOP JA-Series Precision Analytical Balances (JA1003, JA1203, JA2003, JA3003, JA4103, and JA5003) are high-reliability laboratory instruments engineered for routine quantitative analysis, quality control, and formulation tasks requiring consistent 1 mg readability across capacities from 100 g to 500 g. These balances operate on electromagnetic force compensation (EMFC) principle — a standard architecture for modern analytical balances — where the restoring force required to maintain equilibrium of the load cell is precisely measured and converted into mass output. Designed for ISO/IEC 17025-compliant laboratories and GLP environments, each unit delivers traceable accuracy through external calibration protocols aligned with ASTM E898 and OIML R76 standards. The robust mechanical design incorporates integrated anti-vibration damping, thermal drift mitigation via dynamic temperature compensation, and a sealed electromagnetic transducer assembly to ensure long-term stability under variable ambient conditions.

Key Features

• High-contrast white-backlit LCD display with intuitive icon-based navigation and real-time status indicators
• Light-touch membrane keypad with tactile feedback and wear-resistant surface coating
• Integrated below-balance weighing hook for density determination and magnetic susceptibility measurements
• Dual-layer draft shield with sliding glass doors and transport lock mechanism to prevent mechanical shock during relocation
• Four-stage mechanical vibration isolation system optimized for benchtop use in non-dedicated lab spaces
• Adjustable weighing speed (fast/standard/sensitive modes) to balance throughput and stability requirements
• Auto-zero tracking with user-definable threshold and response time to accommodate slow environmental drift
• Overload protection circuitry with audible and visual alarm activation at ≥110% of rated capacity
• Multi-unit conversion supporting grams (g), ounces (oz), carats (ct), grains (gr), and percent (%) mode

Sample Compatibility & Compliance

The JA-Series accommodates a broad range of sample types — including powders, granules, liquids in tared vessels, and small solid components — within its Φ90 mm stainless-steel weighing pan. The enclosed draft shield minimizes convective air currents and electrostatic interference, enabling stable measurement of low-mass samples (<10 mg) without mandatory ionization accessories. All models comply with international metrological requirements per OIML R76-1 (Class II) and support traceable calibration using certified Class M2 or better weights. For regulated industries, the balances meet foundational criteria for FDA 21 CFR Part 11 readiness when paired with validated SOPs for calibration, maintenance, and data recording — though native electronic audit trail functionality requires integration with compliant third-party LIMS or ELN platforms.

Software & Data Management

Data output is supported via RS-232 serial interface (standard) with optional USB-to-serial adapter compatibility. The balance transmits stabilized weight values, unit identifiers, and status flags (e.g., “STABLE”, “OVERLOAD”) in ASCII format, enabling seamless ingestion into Excel, LabWare, STARLIMS, or custom Python/Matlab scripts. While the onboard firmware does not include built-in data logging or user access controls, its deterministic communication protocol allows full integration into GxP-aligned workflows when coupled with validated middleware that enforces electronic signature, change control, and audit trail generation per ALCOA+ principles. Firmware updates are delivered via manufacturer-issued HEX files and require authorized service technician execution.

Applications

These balances serve as primary mass-measurement tools in pharmaceutical QC labs (USP testing, active ingredient dispensing), academic chemistry teaching labs (stoichiometric preparation, titrant standardization), food safety testing (moisture content by loss-on-drying), polymer research (additive dosing), and environmental labs (filter weighing for particulate matter analysis). Their 1 mg resolution and ±0.001 g repeatability make them suitable for applications such as tablet weight variation checks (Ph. Eur. 2.9.5), catalyst loading in catalysis studies, and gravimetric calibration of volumetric glassware. The counting function supports rapid inventory verification of uniform parts (e.g., screws, microcentrifuge tubes) where piece-weight consistency falls within ±0.5% CV.

FAQ

What calibration standards are recommended for routine verification?
Certified Class M2 weights (or better) traceable to NIST or BIPM are required for external calibration; annual verification against accredited reference masses is advised for GLP compliance.
Is internal calibration available on these models?
No — all JA-Series balances use external calibration only; no motorized internal weight mechanism is integrated.
Can the balance be mounted on a vibration-isolation table?
Yes — the compact footprint (365 × 223 × 338 mm) and low center of gravity allow stable operation on passive optical tables or granite slabs when ultra-high stability is required.
Does the unit support direct connection to a networked LIMS?
Not natively — RS-232 output must be interfaced via a serial server or middleware layer that handles protocol translation, authentication, and audit-trail enrichment.
What is the operating temperature range for specified performance?
10–30 °C at ≤80% RH non-condensing; full specifications apply only within this range, with dynamic compensation active across the entire span.