Thermocouple & Extension Wire

Thermocouples are sensors that measure temperature across a wide range of applications in most industrial environments, and thermocouple extension wires used to create a hardwearing connection between the thermocouple probe to a readout instrument. These extension wires are used to extend a thermocouple signal back to the instrument and cannot be used in a thermocouple probe. At RS Components, we have a curated range of thermocouple extension wires suitable for J, K, L, N, R/S, RTD, S and T thermocouples from leading brands in the industry, including Jumo, Keysight Technologies, Reckmann and our own RS PRO.

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 and cannot be used as part of the probe itself. Thermocouple grade wire is used instead to make the sensing point of the thermocouple, as extension wire has a lower ambient temperature limit, which means may return a signal representing higher temperature readings than those that would be returned by a proper thermocouple probe, and therefore extension wire can't be used in a thermocouple's sensing point. Thermocouple wire can be used as an extension if necessary.


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Description Price Thermocouple Type Length Maximum Operating Temperature Screened/Unscreened Core Strands Insulation Material Cable Shape Number of Strands American Wire Gauge Series Standards Met Voltage Rating
RS Stock No. 611-8012
BrandRS PRO
£30.48
1 Reel of 25 Metre(s)
Reel(s)
K 25m +250°C Unscreened 1/0.315mm PFA Multicore 1 - - - -
RS Stock No. 236-3921
BrandRS PRO
£19.96
1 Reel of 25 Metre(s)
Reel(s)
J 25m +105°C Screened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 407-1444
BrandRS PRO
£125.00
1 Reel of 25 Metre(s)
Reel(s)
RTD 25m +80°C Screened 7/0.2mm PTFE Multicore 7 - - - -
RS Stock No. 611-8129
BrandRS PRO
£71.77
1 Reel of 50 Metre(s)
Reel(s)
- 50m +105°C Screened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 151-209
BrandRS PRO
£9.53
1 Reel of 10 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 611-7980
BrandRS PRO
£54.05
1 Reel of 25 Metre(s)
Reel(s)
K 25m +260°C Unscreened 7/0.2mm PFA Multicore 7 - - - -
RS Stock No. 827-5823
BrandRS PRO
£45.48
Each
Units
RTD 10m +200°C - 7/0.2mm Silicone Rubber Twisted 7 - - - -
RS Stock No. 151-316
BrandRS PRO
£11.21
1 Reel of 25 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 236-3858
BrandRS PRO
£84.65
1 Reel of 25 Metre(s)
Reel(s)
K 25m +250°C Unscreened 7/0.2mm PTFE Flat 7 - - - -
RS Stock No. 611-7924
BrandRS PRO
£75.54
1 Reel of 100 Metre(s)
Reel(s)
- 100m +105°C Screened 7/0.2mm Mylar Multicore 7 - - - -
RS Stock No. 611-7918
BrandRS PRO
£75.80
1 Reel of 100 Metre(s)
Reel(s)
J 100m +105°C Screened 7/0.2mm Mylar Multicore 7 - - - -
RS Stock No. 779-9716
BrandRS PRO
£22.92
Each
Units
- - - - - - - - - - - -
RS Stock No. 611-8040
BrandRS PRO
£78.25
1 Reel of 50 Metre(s)
Reel(s)
T 50m +260°C Unscreened 7/0.2mm PFA Multicore 7 - - - -
RS Stock No. 219-4589
BrandRS PRO
£11.37
1 Reel of 10 Metre(s)
Reel(s)
K 10m +400°C Unscreened 1/0.315mm Fibreglass Multicore 1 - - - -
RS Stock No. 611-7968
BrandRS PRO
£22.77
1 Reel of 50 Metre(s)
Reel(s)
K 50m +260°C Unscreened 1/0.2mm PFA Multicore 1 - - - -
RS Stock No. 407-1466
BrandRS PRO
£55.36
1 Reel of 25 Metre(s)
Reel(s)
RTD 25m +80°C Screened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 219-4595
BrandRS PRO
£23.63
1 Reel of 10 Metre(s)
Reel(s)
K 10m +400°C Unscreened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 611-7902
BrandRS PRO
£13.43
1 Reel of 25 Metre(s)
Reel(s)
- 25m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 407-1523
BrandRS PRO
£96.43
1 Reel of 20 Metre(s)
Reel(s)
K 20m +250°C Unscreened - Kapton Single Core - - - RoHS Compliant -
RS Stock No. 219-4753
BrandRS PRO
£6.05
1 Reel of 10 Metre(s)
Reel(s)
J 10m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -