Verification of Electromagnetic Shielding Scheme for Physical Force-Measuring Weighing Instruments in Strong Electromagn
2026-10-14
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Case Background
A steel smelting plant requires the upgrading of its furnace hopper weighing device to improve weighing accuracy under high-temperature, strong magnetic and high-electromagnetic conditions. The hopper is located adjacent to high-voltage power distribution cabinets, with several 10 kW variable-frequency water pumps, electric welding machines and other equipment in the vicinity. The maximum magnetic field strength is approximately 60 A/m; radio frequency signals mainly range from 10 MHz to 50 MHz, and the instantaneous peak voltage of the power supply can reach up to 1500 V. The currently deployed equipment is a mechanical lever electronic scale, which exhibits a zero offset of 1.8% and full-scale deviation of 2.3% at this site, failing to meet the industrial requirement (≤1%). Considering the characteristics of this environment, an integrated electromagnetic protection scheme combining multi-layer shielding and signal line filtering is proposed. Virtual laboratory tests and on-site experiments will be adopted to verify the effectiveness of the system, providing references for the reliability operation of weighing instruments under strong electromagnetic environments.
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Causes of Errors in High-Precision Weighing Instruments and Uncertainty Control Methods
2026-10-13
Measurement errors of high-precision weighing instruments are comprehensively affected by multiple factors including sensor nonlinearity, non-uniform mechanical structure and external environmental disturbances, and there are significant interactions among these error sources. Test data show that when the three factors act simultaneously, the peak total system error reaches 0.21% F.S., which is approximately 24% higher than the 0.17% F.S. predicted by linear superposition of single factors. This conclusion is derived from statistical analysis of controlled experimental data under multiple working conditions and repeated measurements, featuring good representativeness and repeatability. The combined uncertainty model established based on the GUM framework realizes unified quantification of each error component. After adopting systematic hierarchical control technology, the expanded uncertainty of measurement results is reduced from 0.116% F.S. to 0.034% F.S., which fully verifies the value of this technology in engineering applications. Future research can focus on the uncertainty propagation mechanism during dynamic weighing.
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Uncertainty Analysis and Evaluation of Measurement Results for Suspended Container Weighing Device
2026-10-13
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The suspended container weighing device adopts the principle of moment balance. It determines the total mass and centroid coordinates of a container by measuring the mass values at the four lifting points of the container. As a common measuring instrument widely used in port terminals, logistics hubs and other sites, the accuracy of its measurement results is critical for overload prevention, eccentric load early warning of container transportation, and the fairness of trade settlement. JJF 2285-2025 Calibration Specification for Suspended Container Weighing Devices specifies the calibration methods for the indication error of mass and the indication error of container centroid coordinates of suspended container weighing devices. This paper analyzes and evaluates the measurement uncertainty thereof.
1 Measurement Basis and Methods
1.1 Measurement Basis
JJF 2285-2025 Calibration Specification for Suspended Container Weighing Devices.
1.2 Unit under Test
Suspended container weighing device.
1.3 Measurement Standard
Standard weights with a nominal value of 500 kg, accuracy class M1, quantity: 20 pieces.
1.4 Measurement Methods
1.4.1 Indication Error of Mass
Ensure the weighing device is under no-load condition, inspect and zero-set the instrument. Starting from zero load, add standard weights up to near the maximum weighing capacity, then unload the standard weights back to zero. Take three measurements at each weighing point. Unloading of standard weights is permitted during measurement; after unloading, the zero point shall be checked. If the zero indication is non-zero, the indication shall be reset to zero.
1.4.2 Indication Error of Centroid Coordinates
Divide the container plane into four zones A, B, C and D. Connect the container to the weighing device. Place the centroid standard artifact at at least one position within Zone A according to the operating conditions of the weighing device. Start the weighing device and perform zero setting. Place the centroid standard artifact at the selected position and carry out three repeated measurements. Repeat the above measurement procedure for Zone B, Zone C and Zone D respectively. This evaluation takes Zone A as an example.
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Intelligent Evolution of Weighing Instruments Enabled by Machine Vision
2026-10-08
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From traditional weighing data acquisition systems to intelligent weighing management systems, and from manual measurement to intelligent measurement, intelligent weighing instruments have undergone continuous upgrades. These advancements have not only reduced operational costs for enterprises but also enhanced both operational efficiency and safety. With the development and application of next-generation information technologies—such as artificial intelligence, big data, machine vision, 5G, the Internet of Things (IoT), and cloud computing—the deployment of machine vision technology within intelligent weighing systems has also progressively matured. Intelligent weighing instruments empowered by machine vision technology, coupled with ongoing innovations in information technologies, are creating new growth opportunities for traditional enterprises. At the same time, this trend imposes stringent requirements on weighing instrument manufacturers to achieve intelligent transformation.
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Exploration of Strategies for Enhancing the Quality of Metrological Verification and Calibration
2026-09-28
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With the advancement of metrological technology, new types of weighing instruments—such as intelligent leveling instruments, dynamic vehicle scales, and unattended vehicle scales—have been progressively deployed. These devices exhibit more complex functionalities and application scenarios compared to traditional weighing instruments. For instance, intelligent leveling instruments feature capabilities such as coordinated leveling across multiple weighing pans and rapid dynamic measurement, whereas dynamic vehicle scales require weighing verification to be performed while the vehicle is in motion. The currently applicable verification standard for dynamic vehicle scales is JJG 907-2006, which can meet routine verification requirements; however, there are currently no unified national verification standards or calibration specifications for new types of equipment such as leveling instruments. Consequently, verification and calibration activities for such devices are primarily conducted based on corporate technical standards and general weighing instrument technical specifications. The existing standards designed for traditional weighing instruments are insufficient to fully address the specialized verification requirements of new weighing instruments. This gap results in a lack of standardized procedures for the verification and calibration of certain new weighing instruments, leading to calibration methods that lack specificity and making it difficult to guarantee the reliability of verification results.
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