Yoke GE Series 0.01 mg Analytical Balance
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Manufacturer | Yoke Instrument Co., Ltd. |
| Type | Analytical Balance |
| Capacity | 5–20 g (model-dependent), up to 200 g |
| Readability | 0.01 mg (10 µg) |
| Repeatability | 0.01 mg |
| Calibration | External |
| Max Capacity | 50 g / 100 g / 200 g (by model) |
| Linearity Error | ±0.5e (0 ≤ m ≤ 50 g), ±1.0e (50 g < m ≤ 200 g), ±1.5e (m > 200 g) |
| Stabilization Time | ~13 s (0.01 mg mode), ~4 s (0.1 mg mode) |
| Pan Diameter | Φ80 mm |
| Dimensions (W×D×H) | 350 × 210 × 346 mm |
| Power Supply | 12 V DC / 1000 mA |
| Power Consumption | 12 W |
| Net Weight | 8.5 kg |
| Warm-up Time | 30 min (recommended for initial use) |
Overview
The Yoke GE Series 0.01 mg Analytical Balance is an ISO/IEC 17025-aligned precision mass measurement instrument engineered for laboratories requiring high-resolution gravimetric analysis in compliance with pharmacopeial standards (USP , EP 2.1.3) and quality control protocols. Based on electromagnetic force compensation (EMFC) transduction technology, the GE Series delivers traceable, temperature-compensated mass readings with a nominal readability of 10 µg (0.01 mg) across multiple capacity variants — including 20 g, 50 g, 100 g, and 200 g maximum load configurations. Its monolithic sensor architecture minimizes mechanical hysteresis and thermal drift, while the internal temperature stabilization system ensures consistent performance under ambient fluctuations between 15–30 °C. Designed for GLP/GMP environments, the balance meets OIML R 76-1 Class I accuracy requirements and supports audit-ready documentation through configurable data logging.
Key Features
- Electromagnetic force compensation (EMFC) sensor with active temperature compensation for long-term stability and low drift (<0.01 mg/30 min after stabilization)
- Class I accuracy per OIML R 76-1; linearity error conforming to ±0.5e (≤50 g), ±1.0e (50–200 g), ±1.5e (>200 g)
- Repeatability of ≤0.01 mg (standard deviation, n ≥ 10, under controlled lab conditions per ASTM E898)
- Dual-range operation: selectable high-resolution (0.01 mg) and fast-response (0.1 mg) modes optimized for routine QC or research-grade weighing
- External calibration compatibility with certified weights traceable to NIST or BIPM standards; full calibration report export via RS232/USB
- Φ80 mm stainless steel weighing pan with draft shield compatibility (optional modular enclosure kits available)
- Robust aluminum alloy housing with anti-static coating and IP42-rated dust/moisture resistance
- Intelligent power management: maintains internal thermal equilibrium during continuous operation; eliminates need for repeated warm-up when used daily
Sample Compatibility & Compliance
The GE Series accommodates a broad range of sample forms — powders, granules, liquids in tared vessels, micro-vials, filter papers, and small metallic components — within its defined eccentric load tolerance (±10 mm from pan center). All models comply with electromagnetic compatibility (EMC) per EN 61326-1:2013 and safety standards IEC 61010-1:2010. For regulated industries, the balance supports 21 CFR Part 11-compliant user access control (via optional software module), electronic signature capture, and tamper-evident audit trails. It is routinely deployed in pharmaceutical formulation labs (ICH Q5A/Q5B), reference material certification workflows, and university analytical chemistry teaching labs requiring OIML Class I verification.
Software & Data Management
Equipped with standard RS232 and USB-B interfaces, the GE Series integrates seamlessly with LIMS, ELN, and ERP systems using ASCII-based communication protocols (e.g., Modbus RTU or custom SCPI-like command sets). Optional YokeBalanceLink™ PC software enables real-time data streaming, statistical process control (SPC) charting (X̄–R, Cpk), and automated report generation compliant with ISO/IEC 17025 clause 7.7. All weight records include timestamp, operator ID, environmental metadata (if external sensors connected), and calibration status flags. Data export formats include CSV, PDF, and XML — fully compatible with FDA-submission-ready documentation packages.
Applications
- Quantitative preparation of reference standards and working solutions in pharmaceutical QC labs
- Gravimetric analysis of catalyst loading, polymer additives, and nanomaterial dispersions
- Weighing of micro-samples in forensic toxicology and environmental residue testing (e.g., pesticide metabolites in soil extracts)
- Calibration of pipettes and volumetric glassware per ISO 8655-6
- Stability-indicating assay development where mass loss/gain below 0.1 mg must be resolved
- Educational use in undergraduate analytical chemistry courses emphasizing uncertainty propagation and measurement traceability
FAQ
What is the recommended warm-up time before first use?
A 30-minute warm-up period is advised for optimal thermal equilibrium and metrological stability. During routine daily operation, the balance retains thermal stability and requires no additional warm-up.
Does the GE Series support internal calibration?
No — all GE Series models are externally calibrated only, ensuring full transparency and traceability to national metrology institutes via user-provided certified weights.
Can the balance be integrated into a 21 CFR Part 11-compliant workflow?
Yes, when paired with YokeBalanceLink™ software and configured with role-based user accounts, electronic signatures, and immutable audit logs, the system satisfies key Part 11 requirements for electronic records and signatures.
What environmental conditions are required for Class I accuracy?
Operation within 15–30 °C ambient temperature, <60 % RH (non-condensing), and vibration isolation (e.g., granite bench or active damping table) is required to maintain specified repeatability and linearity.
Is the weighing pan removable for cleaning?
Yes — the stainless steel pan is tool-free detachable and autoclavable (up to 121 °C, 20 min), supporting stringent cleanliness protocols in biopharma applications.
