Thermocouple & Extension Wire

Thermocouple extension wire is a hardwearing type of wire used for connecting a thermocouple probe to a readout instrument. Thermocouples are sensors that measure temperature across a wide range of applications in most industrial environments.

What is thermocouple extension wire made from?

Thermocouple extension wire is made from a lower grade of wire than that used in thermocouple probes, so is more economical when used at length. It's typically made with colour-coded (usually PVC) insulation applied to each wire leg. The negative lead is usually insulated in red and the positive lead is the colour of the thermocouple. For added durability and flexibility, a metal overbraid is applied to the insulated wire. For PVC wire this is a tinned copper overbraid, and for PFA it's stainless steel. This added layer protects the wire against abrasion.

Why use thermocouple extension wire?

Thermocouple extension wire is only used to extend the distance between a thermocouple probe and the instrument reading the signal. Thermocouple grade wire is used to make the sensing point of the thermocouple. Extension wire has a lower ambient temperature limit and can't be used in a thermocouple's sensing point.

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Part Details Brand Thermocouple Type Number of Cores Length Minimum Operating Temperature Maximum Operating Temperature Screened/Unscreened Core Strands Insulation material Cable Shape Number of Strands Size of Strands Standards Met
Thermocouple & Extension Wire Type J, -75 → +260 °C 1 Core Screened PFA Sheath 10m RS Pro J 1 10m -75°C +260°C Screened 1/0.3 mm PFA Twin Twisted 1 0.3 mm -
Thermocouple & Extension Wire Type J, -75 → +260 °C 1 Core Screened PFA Sheath 100m RS Pro J 1 100m -75°C +260°C Screened 1/0.3 mm PFA Twin Twisted 1 0.3 mm -
Thermocouple Wire Type K, -10 → +105 °C 2 Core Unscreened PVC Sheath 100m RS Pro K 2 100m -10°C +105°C Unscreened 7/0.2 mm PVC Multicore 7 0.2 mm BS 1843, RoHS Compliant
Extension Cable Type K, -60 → +400 °C 2 Core Unscreened Fibreglass Sheath 25m RS Pro K 2 25m -60°C +400°C Unscreened 1/0.315 mm Fibreglass Multicore 1 0.315 mm IEC 584-3, RoHS Compliant
Extension Cable Type K, -75 → +260 °C 2 Core Unscreened PFA Sheath 100m RS Pro K 2 100m -75°C +260°C Unscreened 1/0.2 mm PFA Multicore 1 0.2 mm IEC 584-3, RoHS Compliant
Extension Cable Type K, -10 → +105 °C 2 Core Unscreened PVC Sheath 100m RS Pro K 2 100m -10°C +105°C Unscreened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Extension Cable Type K, -10 → +105 °C 2 Core Screened Mylar Sheath 100m RS Pro K 2 100m -10°C +105°C Screened 7/0.2 mm Mylar Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Thermocouple Wire Type K, -10 → +105 °C 2 Core Unscreened PVC Sheath 25m RS Pro K 2 25m -10°C +105°C Unscreened 7/0.2 mm PVC Multicore 7 0.2 mm BS 1843, RoHS Compliant
Extension Cable Type T, -75 → +260 °C 2 Core Unscreened PFA Sheath 50m RS Pro T 2 50m -75°C +260°C Unscreened 1/0.2 mm PFA Twisted Pair 1 0.2 mm IEC 584-3, RoHS Compliant
Extension Cable Type J, -10 → +105 °C 2 Core Unscreened PVC Sheath 100m RS Pro J 2 100m -10°C +105°C Unscreened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Thermocouple Wire Type K, -10 → +105 °C 2 Core Screened PVC Sheath 25m RS Pro K 2 25m -10°C +105°C Screened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Extension Cable Type K, -75 → +260 °C 2 Core Unscreened PFA Sheath 50m RS Pro K 2 50m -75°C +260°C Unscreened 1/0.2 mm PFA Multicore 1 0.2 mm IEC 584-3, RoHS Compliant
Extension Cable Type K, -10 → +105 °C 2 Core Screened PVC Sheath 25m RS Pro K 2 25m -10°C +105°C Screened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Extension Cable Type K, -75 → +250 °C 2 Core Unscreened PFA Sheath 25m RS Pro K 2 25m -75°C +250°C Unscreened 1/0.315 mm PFA Multicore 1 0.315 mm IEC 584-3, RoHS Compliant
Thermocouple & Extension Wire Type T, -10 → +105 °C 2 Core Unscreened PVC Sheath 25m RS Pro T 2 25m -10°C +105°C Unscreened 7/0.2 mm PVC Twisted Pair 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Extension Cable, -10 → +105 °C 4 Core Screened PVC Sheath 50m RS Pro - 4 50m -10°C +105°C Screened 7/0.2 mm PVC Multicore 7 0.2 mm IEC 751, RoHS Compliant
Extension Cable Type T, -10 → +105 °C 2 Core Unscreened PVC Sheath 25m RS Pro T 2 25m -10°C +105°C Unscreened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Thermocouple Wire Type VX, -10 → +105 °C 2 Core Screened Mylar Sheath 100m RS Pro VX 2 100m -10°C +105°C Screened 7/0.2 mm Mylar Multicore 7 0.2 mm IEC 584-3, RoHS Compliant
Extension Cable Type J, -10 → +105 °C 2 Core Screened PVC Sheath 25m RS Pro J 2 25m -10°C +105°C Screened 7/0.2 mm PVC Multicore 7 0.2 mm BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
Extension Cable Type K, -75 → 480 °C 1 Core Unscreened Fibreglass Sheath 10m RS Pro K 1 10m -75°C +480°C Unscreened 1/0.3 mm Fibreglass Single Core 1 0.3 mm BS 1843, RoHS Compliant
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