Study on automatic zero correction mode and its influence on light scattering online dust monitor
WU Dan, ZHAO Hongda, ZHANG Guocheng, LIU Jiaqi, SHEN Shangyi, TIAN Ying
National Quality Supervision and Inspection Center for Eco-environmental Products, Beijing Institute of Metrology, Beijing 100029, China
Abstract: Automatic zero calibration function were required to light scattering online dust monitors to self-corrected after data drift in the process of long-term use, so as to reduce the measurement error caused by lack of self-cleaning function. A dust monitor calibration device was set up to study the effects of automatic zero calibration structures including no switching valve, front switching valve and rear switching valve and the high-concentration inundate experiment on zero-point measurement efficiency, instrument sampling flow rate and measurement error of the online dust monitors. It is found that the three structures can only realize zero point measurement, but failed in zero point calibration. The zero point measurement efficiency is: no switching valve > rear switch valve > front switch valve. In addition, the dust accumulation of the front switching valve is easy to cause secondary pollution of the sensor, and the dust accumulation of the rear switching valve is easy to cause second pollution of the sensor, which both affected the sensor measurement error. Therefore, the online light scattering dust monitor should be combined with sensor zero calibration algorithm or periodic cleaning to achieve the final goal. The existing standards and specifications need to further refine the detection method of automatic zero calibration function and the setting of performance indicators, so as to improve the accuracy and stability of online dust monitor measurement.
Keywords: light scattering;on-line dust monitor;automatic zero correction;zero measurement efficiency
2023, 49(9):133-138  收稿日期: 2021-10-14;收到修改稿日期: 2021-12-29
基金项目: 国家质量基础的共性技术研究与应用国家重点研发计划（2017YFF0205504）；中国计量测试学会第五届中国科协青年人才托举项目（YESS20200257）；北京市计量检测科学研究院自主课题项目（KJ2021-15）；国家市场监督管理总局技术保障专项项目（2020YJ004）
作者简介: 吴丹（1991-），女，四川夹江县人，高级工程师，博士，主要从事颗粒物检测相关研究
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