【摘要】 设计了多通道大气颗粒物采样器,可同时采集4个通道的PM_2.5样品,灵活配置采样通道的开启,每个通道单独设置质量流量计,采用闭环反馈技术,通过比例阀、流量传感器及流量控制板共同控制和校正采样流量,保证通道流量的稳定性。与单通道采样器（BGI PQ 200）进行了为期30 d的比对测试,结果表明,多通道采样器斜率、截距和相关系数均符合《环境空气颗粒物(PM10和PM_2.5)采样器技术要求及检测方法》（HJ 93—2013）的要求,可满足实际应用需求。更多还原

【Abstract】 The self-designed multi-channel atmospheric particulate sampler can collect PM_2.5 with four channels simultaneously,and the working of sampling channel can be configured according with the requirements. A mass flow meter is employed in each channel.The closed loop feedback technology is used to ensure the stability of channel flow rate. To assure the stability of flow,the flow rate of the sample is accurately controlled and corrected by proportional valve,flow sensor and flow controlling panel. A comparison test was being carried out for 30 days between self-designed multi-channel sampler and single channel sampler（ BGI PQ 200）. The results reveal that the slope,intercept and correlation coefficients conform to the requirements of"The ambient air particulate matter( PM10 and PM_2.5) sampler technical requirements and test methods"（ HJ 93—2013）. The self-designed multi-channel sampler can meet the application requirements.更多还原