You must use a respirator if the fuel-gas concentration in the work area is 5% more than the lower explosive limit (LEL).
如果工作区域的油气浓度比最低爆炸浓度高出5%，必须使用呼吸器。
The paper experimentally studied the explosive limit and the critical oxygen concentration of several kinds of gases that are found in the mine.
通过实验，对煤矿井下存在的多元混合气体的爆炸极限和临界氧浓度进行了分析和研究。
Taking the flammability of hydrogen into account, in this paper, optical fiber is used as a sensing probe in hydrogen environment to test the hydrogen concentration which is below the explosive limit.
考虑到氢气易燃，本文采用光纤作为敏感探头元件，在氢气环境下测试低于爆炸极限的氢气浓度。
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