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Analysis of the uniformity and stability of dust concentration calibration systems in instrument testing
Jiangjiang Yin1, Shaofeng Wang2, Liwei Shi2
1School of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, China; Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, 08023, Spain.
Abstract:
Accurate calibration of dust concentration measuring instruments is essential for ensuring the reliability of industrial and environmental monitoring. This study systematically investigates the uniformity and stability of an advanced high-concentration dust calibration device through comprehensive verification experiments, including factory inspection, point-by-point concentration testing, long-term fixed-point measurement, and the evaluation for a wide-range concentration. The results demonstrate that the established device can achieve a spatial uniformity deviation of ±4.4% and a stability standard deviation of ±1.6%, both within the ±5% threshold specified by JJG 846-2015. Across a concentration range of 100-1000 mg/m3, although slightly higher repeatability values were observed at 500 and 600 mg/m3, most concentration levels remaining below the 5% reference criterion. These findings indicate that the calibration system can provide a homogeneous and stable dust-laden environment suitable for accurate and traceable calibration of dust concentration monitors. The research offers valuable insights for improving the metrological reliability of dust measurement technologies and contributes to the standardization of calibration practices in environmental and industrial applications.
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