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. 814-0096
BrandRS PRO
TWD318.00
Each
units
T 25m +260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0109
BrandRS PRO
TWD1,440.00
Each
units
T 100m 260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0106
BrandRS PRO
TWD653.00
Each
units
T 50m 260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 236-3842
BrandRS PRO
TWD2,728.00
1 Reel of 25 Metre(s)
Reel(s)
K 25m +400°C Screened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 219-4573
BrandRS PRO
TWD1,920.00
1 Reel of 100 Metre(s)
Reel(s)
K 100m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 611-7889
BrandRS PRO
TWD3,949.00
1 Reel of 100 Metre(s)
Reel(s)
K 100m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 219-4595
BrandRS PRO
TWD1,048.00
1 Reel of 10 Metre(s)
Reel(s)
K 10m +400°C Unscreened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 827-6047
BrandRS PRO
TWD5,553.00
Each
units
K 50m +260°C - 1/0.315mm PTFE Flat Pair 1 - - - -
RS Stock No. 407-1488
BrandRS PRO
TWD4,161.00
1 Reel of 25 Metre(s)
Reel(s)
K 25m +200°C Unscreened 7/0.2mm PTFE Single Core 7 - - RoHS Compliant -
RS Stock No. 779-9713
BrandRS PRO
TWD835.00
Each
units
- - - - - - - - - - - -
RS Stock No. 611-8040
BrandRS PRO
TWD3,525.00
1 Reel of 50 Metre(s)
Reel(s)
T 50m +260°C Unscreened 7/0.2mm PFA Multicore 7 - - - -
RS Stock No. 236-3820
BrandRS PRO
TWD974.00
1 Reel of 25 Metre(s)
Reel(s)
K 25m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 151-209
BrandRS PRO
TWD423.00
1 Reel of 10 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 827-6066
BrandRS PRO
TWD1,177.00
Each
units
K 25m +350°C - 1/0.2mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 407-1466
BrandRS PRO
TWD2,448.00
1 Reel of 25 Metre(s)
Reel(s)
RTD 25m +80°C Screened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 607-8677
Mfr. Part No.909723/0001
BrandJumo
TWD2,854.00
Each
units
J 10m +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 814-0128
BrandRS PRO
TWD4,231.00
Each
units
K 50m 260°C - 7/0.2mm PFA Teflon Flat Pair 7 - - - -
RS Stock No. 768-6632
BrandRS PRO
TWD813.00
Each
units
J 2m +220°C - 7/0.2mm PVC Multicore 7 - - IEC, RoHS Compliant -
RS Stock No. 607-8683
Mfr. Part No.909723/0001
BrandJumo
TWD6,092.00
Each
units
J 25m +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 185-3017
BrandRS PRO
TWD1,426.00
Each
units
RTD 5m +260°C - - - - 7 - - - -