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Electromagnetic interference from personal dust monitors and other electronic devices with proximity detection systems

机译：具有邻近检测系统的个人粉尘监视器和其他电子设备的电磁干扰

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In April 2016, the U.S. Mine Safety and Health Administration (MSHA) began requiring the use of continuous personal dust monitors to monitor and measure respirable mine dust exposures to underground coal miners. Mines are currently using the PDM3700 personal dust monitor to comply with this regulation. After the PDM3700's implementation, mine operators discovered that it interfered with proximity detection systems, thus exposing miners to potential striking and pinning hazards from continuous mining machines. Besides the PDM3700, other electronic devices were also previously reported to interfere with proximity detection systems. MSHA sought the aid of the U.S. National Institute for Occupational Safety and Health (NIOSH) and mining .industry stakeholders to determine how the PDM3700 and some other electronic devices and proximity detection systems interact with each other. Accordingly, NIOSH investigated existing standards, developed test protocols, designed experiments and conducted laboratory evaluations. Some interferences were observed to be caused by electromagnetic interference from some electronic devices, including the PDM3700. Results showed that there was no significant interference when the PDM3700, as well as other electronic devices, and the miner-wearable component of the proximity detection system were separated by distances of 15 cm (6 in.) or greater. In the present study, it was found that the PDM3700 and the personal alarm device needed to be at least 15 cm (6 in.) apart in order for them to be used simultaneously and reduce potential interference.
机译：2016年4月，美国矿山安全和健康管理局（MSHA）开始需要使用连续的个人粉尘监测器来监测和测量地下煤矿的可吸入矿井粉尘暴露。矿山目前正在使用PDM3700个人防尘监控器来遵守此规定。在PDM3700的实施之后，矿井操作员发现它干扰了接近检测系统，从而将矿工暴露于潜在的撞击和从连续采矿机捕获危险。除了PDM3700之外，还报告了其他电子设备以干扰接近检测系统。 MSHA寻求美国国家职业安全和健康研究所（Niosh）和采矿。行业利益相关者的援助，以确定PDM3700和一些其他电子设备和接近检测系统如何彼此相互作用。因此，Niosh调查了现有的标准，开发了测试方案，设计的实验和进行了实验室评估。观察到一些干扰是由来自一些电子设备的电磁干扰引起的，包括PDM3700。结果表明，当PDM3700以及其他电子设备以及接近检测系统的距离的距离为15cm（6英寸）或更大的距离时，没有显着的干扰。在本研究中，发现PDM3700和个人报警装置特征在于分开至少15厘米（6英寸），以便同时使用并降低潜在的干扰。

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