有爆炸危險厂房里电气設备的应用范圍在不断地扩大,許多化学、气体、石油的生产以及其他的工業生产部門,都是与制造、精煉、保存有爆炸危險气体、蒸气、粉末、可燃液体与易燃液体有关的。有关的衛生技术規程規定了空气里能含爆炸性危險物質的最大允許極限,同时,也要求設置排气和进气設施,以进行衛生通風,并确定有一定的換气次数。厂房的空气内所含爆炸性危險物質的最大允許極限,往往是低于这些物質与空气混合物的爆炸濃度的最低極限。这一点对于确定厂房的爆炸危險等級是具有重大意义的。应当指出,有效可靠的衛生技术通風,对提高有爆炸危险裝置的工作安全程度是一个極重要的因素。目前,工業上正在試用,生产和推广自动动作的信号器,这种信号器可反应有爆炸危險环境內的有爆炸危險的气体和蒸气是否达到了規定的濃度。应用这种信号器,在提高 Explosion Hazards The range of electrical equipment used in the plant is constantly expanding and many chemical, gas, petroleum and other industrial processes are associated with the manufacture, refining and storage of explosive gases, vapors, powders, flammable liquids Related to flammable liquids. The relevant hygienic technical regulations stipulate the maximum allowable limit for the amount of explosive hazardous substances in the air. At the same time, they also require the setting of exhaust and air intake facilities for hygienic ventilation and the determination of the number of air changes. The maximum allowable limit for the presence of explosive hazardous materials in the air of a plant is often below the lower limit of the explosive concentration of these mixtures with air. This is of great significance in determining the level of explosion hazards in the plant. It should be pointed out that effective and reliable ventilation of sanitation technology is a very important factor in improving the safety of work in potentially explosive devices. At present, there is an industrial trial, production and marketing of automatic signaling devices that respond to the presence of explosive concentrations of gases and vapors in potentially explosive atmospheres. Application of this annunciator is improving