Bare Wire Accuracy- extension grade thermocouple wire is typically tested to ensure accuracy in the temperature range of 32°F to 392°F (0°C to 200°C).
Insulationson the extension wire are typically FEP or PFA fluoropolymers (400 to 500°F or 200 to 260°C) andFiberglass Braid(900°F or 482°C)
Designs with wire insulation temperature rangesexceedingthe typical bare wire accuracy range of 32°F to 392°F (0°C to 200°C) should be made from specially matched bare wire pairs to ensure accuracy in these higher temperature ranges.
ANSI Color Codeof Type C thermocouple extension wire typically has a white positive wire, red negative wire and white outside PFA or FEP fluoropolymer outside jacket, although this can be confused with IEC color code for 2 conductor RTD wire.
Evosensors has created this wire with an Orange colored jacket to eliminate the color code confusion.
Fiberglass Insulated Type C wire are white positive, red negative and white outside jacket with a red stripe.