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CJR—4型离子烟雾警报器具有两个相连接的离化室。里面有α、γ射线源。其总动能不超过12μci。此仪器供电为220V 的直流电。当燃烧物进入其一离化室时,电流强度下降,电压降增大,继电器立即发生动作,接通警报线路,并传递至信号中心站。同时警报可以传送至防火中心站。这种仪器可以用于无瓦斯矿井及有瓦斯矿井。除了应用到井下外,还可用在地面厂房、试验室及档案馆等地。仪器的精度相当高,每当100立方米煤中有5～8克煤燃烧
CJR-4 ion smoke alarm with two connected to the ionization chamber. There are α, γ ray source. Its total kinetic energy does not exceed 12μci. This instrument is powered by 220V DC. When the combustion products into one of the ionization chamber, the current intensity decreases, the voltage drop increases, the relay immediately action, connected to the alarm line, and passed to the signal center. At the same time alarm can be sent to the fire center. This instrument can be used for non-gas mines and gas mines. In addition to underground applications, but also can be used in ground plants, laboratories and archives and other places. The accuracy of the instrument is quite high, with 5 to 8 grams of coal burning in 100 cubic meters of coal