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. 827-5877
BrandRS PRO
HK$2,135.82
Each
units
J 100m +350°C - 7/0.2mm Glass Fibre Flat Pair 7 - - - -
RS Stock No. 407-1501
BrandRS PRO
HK$2,294.26
1 Reel of 25 Metre(s)
Reel(s)
K 25m +250°C Unscreened 14/0.3mm Silicone Rubber Single Core 14 - - - -
New
RS Stock No. 215-4914
BrandRS PRO
HK$3,987.64
Each
units
K 10m +260°C Unscreened - PFA - - - - - -
RS Stock No. 827-5858
BrandRS PRO
HK$403.03
Each
units
T 50m +350°C - 1/0.3mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 236-3892
BrandRS PRO
HK$781.77
1 Reel of 25 Metre(s)
Reel(s)
T 25m +250°C Unscreened 7/0.2mm PTFE Flat 7 - - - -
New
RS Stock No. 215-4937
BrandRS PRO
HK$359.56
Each
units
K 50m +105°C Unscreened - PVC - - - - - -
RS Stock No. 827-5930
BrandRS PRO
HK$789.90
Each
units
K 25m +260°C - 1/0.508mm PFA Teflon Twisted 1 - - - -
RS Stock No. 827-5921
BrandRS PRO
HK$348.84
Each
units
J 25m +260°C - 1/0.508mm PFA Teflon Twisted 1 - - - -
RS Stock No. 702-7967
Mfr. Part No.34307A
HK$1,232.58
Each
units
J 1.8m - - - Teflon - - - - - -
RS Stock No. 814-0074
BrandRS PRO
HK$115.58
Each
units
T 25m +105°C - 7/0.2mm PVC Flat Pair 7 - - - -
RS Stock No. 407-1494
BrandRS PRO
HK$1,016.06
1 Reel of 25 Metre(s)
Reel(s)
J 25m +200°C Unscreened 7/0.2mm PTFE Single Core 7 - - RoHS Compliant -
New
RS Stock No. 215-4936
BrandRS PRO
HK$71.96
Each
units
K 10m +105°C Unscreened - PVC - - - - - -
RS Stock No. 407-1488
BrandRS PRO
HK$1,090.95
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. 2509193814
Mfr. Part No.1016
HK$2,025.10
1 Reel of 152 Metre(s)
Reel(s)
- - - - - - - - - - - -