Since its application in 1971, due to the heating power varying with the temperature changes along the heat tracing cable, the heated semiconductor core material behaves as a variable temperature resistor opposite to the heating temperature high/low trend. Self-regulating heat tracing cables have become the most common type of heat tracing cables in the world today. They can be widely used for transporting liquid objects in pipelines and anti-freeze insulation of tanks, maintaining process temperature, heating roads, ramps, pedestrian crossings, eaves, floors, etc.
Self-regulating heat tracing cables have semiconductor polymer material distributed between two conductive cores for heating, and the exterior consists of an inner polymer jacket, an alloy shielding mesh, and an outer polymer jacket. When current passes through, as the temperature of the heat tracing cable rises, the cable resistance also increases. As a result, the output power of the heat tracing cable decreases as its temperature increases. Since the heating power varies with the temperature changes along the heat tracing cable, the heated semiconductor core material behaves as a variable temperature resistor opposite to the heating temperature high/low trend. Self-regulating heat tracing cables will not overheat even when overlapped. Without special design, self-regulating heat tracing cables can be cut to any working length on site to precisely match the actual laying length of the pipeline, requiring no special tools and being very easy to install.
1. Copper core wire: 7×0.50, 19×0.32, 19×0.41
2. Conductive plastic layer: ordinary PTC, flame-retardant PTC, fluorine-containing PTC
3. Insulation layer: modified polyolefin, flame-retardant polyolefin, fluorine-containing polyolefin, perfluorinated material
4. Shielding layer: tinned soft round copper wire, coverage density 80%
5. Sheath layer: modified polyolefin, flame-retardant polyolefin, fluorine-containing polyolefin, perfluorinated material
3. Construction temperature: minimum: -5°C
4. Thermal stability: after 300 cycles between 15°C and 99°C, the cable heat output remains above 90%.
5. Bending radius: 25.4mm at room temperature 20°C, 35.0mm at low temperature -30°C
6. Insulation resistance: for cable length 100m, ambient temperature 75°C, using 2,500VDC megger for 1 minute, insulation resistance (between conductor and shield) minimum value is 120MΩ.
7. Starting current (10°C): 0.4A per meter
8. For installation and use, please refer to some precautions
9. Maximum use length: not exceeding 100 meters
Classification by Temperature
According to the different composition of polymer PTC material, self-regulating heating cables are divided into low-temperature type and high-temperature type.
Common ones on the market include those based on ← Previous
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