An understanding of power with the tropics: 
 Electric tracing the material structure of the tropics: 
 Self-limit temperature, with tropical (referred to as the electric heating cables) is a long strip limit temperature electric heater, heat resistivity of the material has a high positive temperature coefficient (PTC), its structure is shown in Figure. Extruded semi-conductive polymer PTC Composite evenly between two parallel metal wire core, as the jacket and then wrapped with a layer of insulating material on the outside, they can use the basic type of electrical power with tropical, if necessary and can be combined with shielding and protective layer. 
 Power with tropical works: 
 (Note that the end of the wire core may not be connected) with tropical power, current conductive PTC material to another by a wire core wire core and form a loop. Electrical conductive materials can heat up, then increase in its resistance core with the temperature rose to a value big enough to almost blocked by the extent of current, its temperature is no longer increased resistance at the same time, with tropical lower the temperature to be heating system for heat transfer. With tropical power is mainly controlled by the heat transfer process, with the temperature of the heating system automatically adjusts the output power, constant power heater does not have this feature. 
 Power with tropical characteristics: 
 1, even in the case of no temperature control device installed can automatically control the heating temperature (up to maintain the temperature at 70 ℃ or less), with the Lok Sang antifreeze instrument that can automatically control the pipe temperature is below 4 ℃ heating, higher than 15 ℃ is disconnected, to ensure the highest maintain temperature at 15 ℃ or less; heating pipe is always in the best temperature control within, and more effective to save energy. 
 2, uniform heating can be wrapped, not afraid of overlapping local overheating, and can be cut, simple construction, easy to use, safe and reliable. 
 3, no routine maintenance, low operating costs, can remote control without having to go to the site operation. 
 4, no noise, no pollution, no waste. 
 5, since the limit of the temperature and electric tracing power per m general 25-watt / 10 ° C, the power decreases with increasing temperature.