Overview
ISO/TS 15855:2025 is a technical specification developed by ISO that establishes a step-by-step procedure for testing static scales used in measuring copper, lead, and zinc sulfide concentrates. This standard supports routine verification of scale performance, focusing on precision, bias, and linearity in weighing equipment such as weighbridges, hopper scales, and platform scales. The procedures align with the analytical formulas specified in ISO 12745, offering operators a reliable methodology to validate the accuracy and calibration of static scales critical to commercial transactions involving mineral concentrates.
Key Topics
-
Scope and Purpose: ISO/TS 15855:2025 defines simple, practical procedures for conducting performance checks and calibration status tests on static scales used in sulfide concentrate weighing.
-
Precision Testing: Detailed procedures provide guidance on replicate weighing tests to determine scale precision across different types of scales:
- Weighbridges: Precision assessed by repeated weighings of trucks or rail wagons in multiple positions.
- Hopper Scales: Precision measured using test masses relative to scale sensitivity.
- Platform Scales: Precision established through replicate weighings of bags or similar loads in varied positions.
-
Calibration Testing: The standard outlines two calibration methods to assess scale bias and linearity:
- Single Certified Test Weight Method: Uses one certified weight or equivalent to test calibration points at zero, half, and near full scale capacity.
- Multiple Certified Test Weights Method: Employs incremental additions and removals of a set of certified weights covering the entire scale range to generate calibration data points.
-
Frequency of Testing: The document discusses the operational frequency of scale testing, recommending routine performance checks prior to commercial consignments while noting variability in practice based on risk and scale reliability.
-
Compliance and Reference: The procedures are fully aligned with ISO 12745:2008, ensuring consistency in terminology, testing principles, and formulae for result calculation.
Applications
ISO/TS 15855:2025 is vital for industries involved in the production, processing, and commercial trading of copper, lead, and zinc sulfide concentrates. Its practical stepwise methodologies aid:
- Mining Operations: Ensures accurate weighing during extraction and concentrate handling, minimizing commercial disputes.
- Processing Plants: Provides scale testing protocols to maintain measurement integrity in material input and output stages.
- Logistics and Transport: Facilitates precise weighbridge checks critical for freight and customs declarations involving heavy loads.
- Quality Assurance: Assists regulatory compliance and internal quality control through documented scale performance verification.
- Automated Weighing Systems: Supports routine calibration and performance assessments in semi-automated and fully automated weighing installations.
By following ISO/TS 15855:2025, organizations reduce risk related to inaccurate mass measurements and improve trust among commercial partners.
Related Standards
- ISO 12745:2008 – Precision and bias of mass measurement techniques for copper, lead, and zinc ores and concentrates, providing foundational measurement principles referenced directly in ISO/TS 15855.
- ISO/IEC Directives, Part 1 and Part 2 – Guide the editorial and development process of ISO standards, ensuring consistency and reliability.
- National and Regional Weighing Standards – Local regulations may complement this specification for mandatory calibration intervals and certification requirements.
- ISO/TC 183 Technical Committee – The governing body developing standards related to copper, lead, zinc, and nickel ores and concentrates.
Keywords: ISO/TS 15855:2025, static scale testing, calibration procedure, weighbridge precision, hopper scale calibration, platform scale testing, copper lead zinc concentrates, mass measurement accuracy, scale bias and linearity, mineral concentrate weighing standards.