This paper presents the results of large-scale fire experiments on evaluating the performances of carbon monoxide (CO) and smoke sensors at low ventilation velocities. Experiments using three different combustibles—conveyor belt, coal, and diesel fuel—were conducted in the Experimental Mine at the National Institute for Occupational Safety and Health (NIOSH) Bruceton Research Facility. A total of eight sensor stations were located downstream of the fire with each station containing CO, smoke, carbon dioxide, oxygen, humidity, barometric pressure, temperature sensors, and two airflow sensors. The airflow velocity ranged from 0.22 to 0.26 m/s (44 to 51 fpm) in the tests. The response times were recorded for the CO and smoke sensors at each sensor station when smoke and gaseous products of combustion of each burning combustible reached the station. The response times of the CO sensors were used to determine the appropriate sensor spacing in the belt entry with a low air velocity. The performance of the smoke sensor was found to be affected by the high humidity in the experiments. The results on proper selection of sensors and the determination of sensor spacing at a low ventilation velocity can be helpful for ensuring sufficient early fire warning for underground workers, thereby improving the health and safety of miners.

中文翻译：

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在低通风速度下评估一氧化碳和烟雾传感器

本文介绍了在低通风速度下评估一氧化碳 (CO) 和烟雾传感器性能的大规模火灾实验结果。在美国国家职业安全与健康研究所 (NIOSH) 布鲁斯顿研究所的实验矿中，使用三种不同的可燃物（传送带、煤和柴油）进行了实验。共有 8 个传感器站位于火灾下游，每个站包含一氧化碳、烟雾、二氧化碳、氧气、湿度、气压、温度传感器和两个气流传感器。测试中的气流速度范围为 0.22 至 0.26 m/s（44 至 51 fpm）。当每个燃烧的可燃物的烟雾和燃烧的气体产物到达站点时，记录每个传感器站点的 CO 和烟雾传感器的响应时间。CO 传感器的响应时间用于确定低风速下皮带入口处的适当传感器间距。在实验中发现烟雾传感器的性能受到高湿度的影响。The results on proper selection of sensors and the determination of sensor spacing at a low ventilation velocity can be helpful for ensuring sufficient early fire warning for underground workers, thereby improving the health and safety of miners.