Overview
A weighted balance scale, also known as a counterbalance scale, operates on the principle of mechanical equilibrium to measure mass with high accuracy. Unlike electronic scales, it relies on standardized weights (counterweights) to balance an unknown mass. This design minimizes reliance on external power, making it ideal for environments where electricity is unreliable or precision is critical. Historically rooted in ancient weighing systems, modern variants are refined for laboratory, industrial, and pharmaceutical applications. They are particularly valued for calibration purposes due to their traceability to international mass standards.
Structure and Working Principle
The scale consists of a rigid beam, two pans (one for the sample and one for counterweights), and a pivot point (fulcrum) that ensures free movement. When masses on both pans equilibrate, the beam aligns horizontally, indicating equal weight. Counterweights are often made of stainless steel to resist corrosion and maintain density consistency. Advanced models include precision bearings to reduce friction and magnetic damping systems to stabilize oscillations. The absence of electronic components reduces drift errors, though manual operation requires skilled handling to achieve repeatable results.
Key Features
Weighted balance scales offer traceable accuracy, often meeting ISO 17025 calibration standards. Their mechanical design ensures longevity with minimal maintenance, as there are no fragile sensors or circuitry. Stainless steel counterweights provide stability across temperature fluctuations. Some industrial models feature built-in weight sets for rapid adjustments, while laboratory versions may include draft shields to eliminate air current interference. Capacities range from 1g to 50kg, with readability down to 0.001g for high-precision tasks.
Application Areas
These scales are indispensable in metrology labs for calibrating other weighing instruments. Pharmaceutical companies use them to verify active ingredient masses, while manufacturing plants rely on them for quality control of raw materials. Educational institutions employ them to teach fundamental physics principles. In jewelry and precious metal trading, their resistance to tampering and electromagnetic interference ensures fair measurements. Specialized variants are used in aerospace for component balancing and in environmental labs for particulate matter analysis.
Maintenance and Precautions
Regularly inspect counterweights for wear or contamination, as surface imperfections can alter mass. Clean pans with a soft brush to avoid static buildup, and store the scale in a dry, vibration-free environment. Lubricate the fulcrum sparingly with manufacturer-recommended oils. Avoid exposure to magnets or strong electrostatic fields, which can disrupt measurements. Calibration should be performed annually by accredited providers using certified reference weights. Always handle counterweights with tweezers or gloves to prevent oil transfer.
B2B Procurement Guide
When sourcing weighted balance scales, verify the supplier’s compliance with OIML R76 or ASTM E898 standards. Key specifications include measurement uncertainty, pan size, and the inclusion of a calibration certificate. For industrial use, opt for ruggedized frames with overload protection. Consider modular systems that allow weight-set upgrades as needs evolve. Bulk purchases of laboratory-grade scales may attract discounts of 10–15%. Lead times for custom configurations (e.g., non-standard capacities) typically range from 4–8 weeks.
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