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The BMK-II type portable coal mine gas explosiveness detector is used in the coal mine, and is carried to the fire area or the accident scene by the fire personnel or the incident handling personnel to detect the operating environment for explosion hazard, excessive concentration of carbon monoxide, and the threatening to the lives of people. The detector can detect the gas concentration of O₂, CH₄, CO and CO₂ in the surrounding environment and the ambient temperature, with an “explosion triangle” directly displayed on the screen, and the sound and light alarm shall be uttered simultaneously when the explosion limit value is approached to or reached.