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. 236-3836
BrandRS PRO
HK$422.35
1 Reel of 25 Metre(s)
Reel(s)
K 25m +400°C Unscreened 1/0.315mm Fibreglass Multicore 1 - - - -
RS Stock No. 236-3820
BrandRS PRO
HK$321.68
1 Reel of 25 Metre(s)
Reel(s)
K 25m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 363-0389
BrandRS PRO
HK$371.40
Each
units
K 25m +250°C Unscreened 1/0.2mm PTFE Twin Twisted 1 - - - -
RS Stock No. 814-0068
BrandRS PRO
HK$264.11
Each
units
K 25m +105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 814-0070
BrandRS PRO
HK$2,935.36
Each
units
K 200m 105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 219-4573
BrandRS PRO
HK$826.53
1 Reel of 100 Metre(s)
Reel(s)
K 100m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 814-0077
BrandRS PRO
HK$1,530.94
Each
units
K 100m 105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 151-209
BrandRS PRO
HK$115.45
1 Reel of 10 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 814-0036
BrandRS PRO
HK$588.66
Each
units
K 100m 260°C - 1/0.3mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0049
BrandRS PRO
HK$224.78
Each
units
K 50m 260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 236-3864
BrandRS PRO
HK$339.46
1 Reel of 25 Metre(s)
Reel(s)
K 25m +105°C Screened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 814-0030
BrandRS PRO
HK$112.62
Each
units
K 25m +260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0033
BrandRS PRO
HK$284.70
Each
units
K 50m 260°C - 1/0.3mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0024
BrandRS PRO
HK$147.36
Each
units
K 25m +260°C - 1/0.3mm PFA Teflon Twisted 1 - - - -
RS Stock No. 814-0042
BrandRS PRO
HK$454.02
Each
units
K 100m 260°C - 1/0.2mm PFA Teflon Twisted 1 - - - -
RS Stock No. 363-0402
BrandRS PRO
HK$253.94
Each
units
T 25m +250°C Unscreened 1/0.2mm PTFE Single Core 1 - - - -
RS Stock No. 236-3842
BrandRS PRO
HK$732.88
1 Reel of 25 Metre(s)
Reel(s)
K 25m +400°C Screened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 236-3870
BrandRS PRO
HK$184.17
1 Reel of 25 Metre(s)
Reel(s)
T 25m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 158-979
BrandRS PRO
HK$491.98
1 Reel of 10 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 779-9713
BrandRS PRO
HK$224.49
Each
units
- - - - - - - - - - - -