发热段（热端）和非发热段（冷端）在同一外保护管内，非发热段（冷端）可以根据实际需要进行缠绕，不需外加冷却设备。广泛用于真空行业、液体输送管道的外加热等。 主要技术参数； 1、工作电压55V、110V、220V、380V 2、工作温度不大于500℃ 3、发热管材不锈钢 4、冷态绝缘电阻大于300MΩ 5、主要管径及参考功率（Φ3.5mm-300W/m）（Φ4mm-350W/m）（Φ5mm-400W/mm）（Φ6mm-500W/mm）Fever (hot side) and fever (CJ), the protection of the same, non-fever (cold side) can be based on the actual need for winding, without external cooling equipment. Widely used in industry vacuum, liquid pipeline, such as heating. Main technical parameters 1, voltage 55 V, 110V, 220V, 380V 2, the operating temperature of not more than 500 ℃ 3, stainless steel pipe 4 fever, cold insulation resistance is greater than 300 M Ω 5, the main reference diameter and power (Φ3.5 mm - 300W / m) (Φ4 mm-350W / m) (Φ5 mm-400W/mm) (Φ6 mm-500W/mm)