Raising the Standard: Legal-for-Trade Belt Weighing in North America By: CST (Control Systems Technology) with original article by the late Lorne Danielson, TD Micronic In Canada, a 2017 policy change now mandates biennial testing for mining-related belt scales. These regular intervals provide critical assurance that the systems remain within tolerance and that measurement accuracy can be relied upon. Quantity of Test Material Field certification of conveyor belt scales requires the use of actual product, often demanding significant site resources. For high-capacity belts (e.g. 6,000 tph), certification may require 5,000 tonnes of material, weighed using calibrated reference systems like rail test cars or track scales. This includes multiple test runs, each requiring precise coordination of equipment, personnel, and weather conditions. Recognizing this burden, recent changes by Measurement Canada and NTEP have adopted OIML provisions allowing for reduced test loads as little as 2% of the scale’s one- hour capacity. These revisions significantly reduce the time, cost, and logistical complexity of recertification, helping operators maintain compliance with less operational disruption. Conclusion While conveyor belt scales have existed for over a century, their recent certification under modern North American standards has elevated them to deliver accuracy once limited to static scales, far surpassing older methods like ship’s draft surveys. Modern legal-for-trade belt scales now provide a level of accuracy and efficiency far superior to legacy methods, ensuring equitable valuation in bulk trade. About the Author This article was originally authored by the late Lorne Danielson, a respected leader in belt weighing and major contributor to TD Micronic’s success, who are now a wholly-owned subsidiary of Control Systems Technology (CST). CST is a leading global engineering company that specialises in in-motion belt weighing for mining, ports and materials handling industries. Originating in Australia, CST delivers high- accuracy belt weighing systems for bulk material handling to projects and partners around the world. Backed by over 40 years of experience, CST is trusted across industry for reliable, application-engineered solutions. Learn more about CST: www.controlsystems.com.au
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