Tiankang Explosion-Proof Thermocouple Manufacturer, Wholesale Price [Anhui Tiankang (Group) Co., Ltd.] Working Principle: If a closed loop is composed of homogeneous conductors (thermocouple electrodes) made of two different compositions, and there is a temperature gradient at both ends, an explosion-proof thermocouple will have current passing through it, resulting in a thermoelectric potential between the two ends. The explosion-proof design utilizes the gap-type explosion-proof principle, designing components such as junction boxes with sufficient strength, sealing all parts that may produce sparks, arcs, and dangerous temperatures inside the junction box. In the event of a fire inside the box, it can extinguish and cool the fire through the joint surface gap, preventing the flame and temperature from spreading outside the box.