Pentair Thermal Management provides power limiting heating cables that allow for higher exposure temperature and higher power output at elevated temperatures.
Raychem power-limiting cables are parallel heaters formed by a coiled resistor alloy heating element wrapped around two parallel bus wires. At a fixed distance, the insulation is removed from the alternate bus wires to form a heating zone.
The positive temperature coefficient effect (PTC) of the heating element reduces power output as ambient temperature increases. This effect allows the power-limiting cable to be overlapped by reducing the temperature of the heating element at the overlap points.
Power-limiting cable can be used for freeze protection and process temperature maintenance requiring high power output and/or high temperature exposure. Power-limiting cables can provide process temperature maintenance up to 455°F (235°C) and can withstand exposure temperatures up to 500°F (260°C) with power off.
|VPL||Raychem||Process Temperature Maintenance
Pipe Freeze Protection
|VPL Data Sheet(PDF)|
Industrial Heat-Tracing for Self-Regulating and Power Limiting Installation Manual(PDF)