Self Regulating Heating Cables

Self Regulating / Self Limiting Heat Trace Cables

Self-regulating heating cables are useful for temperature maintenance needs at low temperatures as their power output will automatically change based on the temperature in working conditions. Self-regulating heat traces are suitable for applications such as frost protection requirements. Furthermore, it is very easy to install and can be cut to length and terminated on site. With suitable jackets, it can also be used in corrosive environments.

As SR cables are self-limiting heating cables, they reduce their output automatically when the pipe temperature is close to the desired temperature, the cable is very energy efficient, and consequently, cost-effective. At the same time, the cable can compensate for the impact of a voltage spike, losses and ambient temperature change etc.

Its highest maintenance temperature is 150°C and its highest operating temperature is 225°C.

How it works

TRM’s self-regulating heating cable is constructed of a semi-conductive matrix extruded between two parallel bus wires, and an outer jacket. The semi-conductive matrix is made from conductive carbon and polyethylene. The conductive carbon forms the conductive paths between the two bus wires when powered on.

The number of the conductive paths between the bus wires varies with the surrounding temperature. TRM self-regulating heating cable adjusts its output to independently respond to temperature all along its length. When the pipe is cold, the Core contracts increasing the number of electrical paths through the conductive carbon and thereby reducing electrical resistance. The increased current flow through the core generates heat. As temperature increases, the core expands and reduces the number of electrical paths.

As core resistance is increased, heat output is reduced. As the surrounding temperature decreases, the core-structure contracts again, increasing the number of electrical paths through the conductive carbon and reducing electrical resistance which in turn produces additional heat. TRM’s self-regulating heating cables provide uniform temperature as they can regulate their output automatically.

The cable produces more heat. Compared with other heating cables, TRM’s self-regulating heating cable provides uniform temperature as it can regulate its output automatically. Of course, the performance of any system always comes down to the correct self-regulating heat trace cable installation process.

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