Intelligent temperature control heating cable, also known as self-regulation of electricity with the hotline, or self-limiting temperature band. It is an electric power with the temperature-limiting heat tracing system temperature self-adjusting ribbon. The cable itself with automatic limit temperature, and temperature changes with the heating system can automatically adjust the heating power function, to ensure that the work system is always stable in setting the best operating temperature normal operation. 
 1.1 Features 
 When heated to automatically limit the operating temperature of the cable; 
 As the temperature of the heating system automatically adjust the output power without the need for external equipment; 
 The cable can be cut short or received within a certain range of the long use of the above performance unchanged. 
 Allow overlapping winding laying without overheating and burning in fear. 
 1.2 The work of the advantages of 
 Temperature control heating cables used in antifreeze and insulation, has the following advantages: 

 Uniform temperature of heating pipes, does not overheat, safe and reliable; 
 Save energy, safety and environmental protection; length long; 
 Intermittent operation of the heating to start fast; 
 Low installation and operating costs; 
 Installation and maintenance is simple; 
 To facilitate automated management 

 2 PTC works 
 2.1 PTC effect and the PTC material 
 The PTC effect of positive temperature coefficient effect is specific to the material resistivity with increasing temperature, and in a certain temperature range the resistivity increases rapidly the characteristics of PTC effect of the material referred to as the PTC material, cable polymer PTC material is semi-crystalline polymer and carbon black blends. 
 2.2 works 
 Temperature control heating cables, heating elements, is uniform between two parallel metal bus crowded with the core package layer of PTC material. PTC material by melt extrusion, cooling and sizing, dispersion of carbon particles to the formation of numerous thin conductive carbon network. When they are connected across two parallel bus, constitute the core with PTC parallel circuit. From a bus when the cable end of the two bus connected to the mains, the current lateral flow through the PTC material layer to reach the other bus to form a parallel circuit. PTC layer is a continuous parallel between the busbar resistance heating element that converts electrical energy into heat energy, the operating system with thermal insulation. Core with a temperature rise to the high impedance resistor large enough to almost blocking the current level, the core with the temperature will reach the upper limit is no longer increased (ie, automatic temperature limiter). At the same time, the core with a heating system, heat transfer through the sheath to the lower temperature, the heat transferred per unit time to reach steady state is equal to the electric power cable. Cable the output power is controlled by the temperature of the heat transfer process and the heating system.