Parallel resistive cable - self-limiting

  • Parallel resistive cable - self-limiting

Self-limiting cables that adapt their output to the ambient temperature.

The self-adjusting heating cable consists of two parallel wires embedded in a semiconductor material that adapts its output according to the ambient temperature. When the temperature changes, the properties of the material change.

When the temperature rises, the output is lowered and vice versa when it gets cold. This occurs within a given temperature range for each cable.

Thus the output is lower in rising temperatures, which allows for crossing, prevents overheating and permits use in areas with a fire or explosion risk.


Properties:

  • Self-regulating with adjustable output
  • Can be used in many different temperature ranges
  • Output controlled by need
  • High chemical resistance
  • No temperature limitation (an advantage for use in Ex areas))
  • Easy to pull and install
  • Can be cut to the required length from the roll
  • Plug-in connections

Applications:

ELSR (self-regulating) cable can be used for frost protection or for maintaining constant temperatures in containers, pipes, valves etc. With the exception of connections the entire heating cable can be lowered into fluids. If the cable is to be used in an aggressive environment (chemical or petrochemical industries), we coat it in a chemical-resistant outer layer (fluoropolymer).


Function:

Self-regulating cable consists of two parallel bus leads set in a plastic heating element and surrounding carbon particles. If the temperature increases in operation, the plastic expands through molecular expansion and the distance between the carbon particles increases. Resistance increases and output decreases. If the temperature drops the opposite occurs and output increases.

This physical property of not exceeding a specified temperature enables crossing self-regulating cables and eliminates the need for a separate shut-off device.