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. 363-0389
BrandRS PRO
PHP2,548.98
Each
units
K 25m +250°C Unscreened 1/0.2mm PTFE Twin Twisted 1 - - - -
RS Stock No. 236-3836
BrandRS PRO
PHP3,381.90
1 Reel of 25 Metre(s)
Reel(s)
K 25m +400°C Unscreened 1/0.315mm Fibreglass Multicore 1 - - - -
RS Stock No. 827-6075
BrandRS PRO
PHP3,448.55
Each
units
K 25m +350°C - 1/0.508mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 407-1573
BrandRS PRO
PHP21,147.93
1 Reel of 20 Metre(s)
Reel(s)
K 20m +1200°C Unscreened - Ceramic Fibre Single Core - - - - -
RS Stock No. 219-4573
BrandRS PRO
PHP6,214.70
1 Reel of 100 Metre(s)
Reel(s)
K 100m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 219-4551
BrandRS PRO
PHP1,325.16
1 Reel of 25 Metre(s)
Reel(s)
K 25m +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 611-7895
BrandRS PRO
PHP9,499.27
1 Reel of 100 Metre(s)
Reel(s)
K 100m +105°C Screened 7/0.2mm Mylar Multicore 7 24AWG - - -
RS Stock No. 814-0064
BrandRS PRO
PHP6,579.02
Each
units
K 100m 350°C - 1/0.3mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 814-0052
BrandRS PRO
PHP1,853.47
Each
units
K 25m +350°C - 1/0.3mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 407-1567
BrandRS PRO
PHP8,496.45
1 Reel of 20 Metre(s)
Reel(s)
K 20m +800°C Unscreened - Fibreglass Single Core - - - - -
RS Stock No. 814-0061
BrandRS PRO
PHP3,573.74
Each
units
K 50m 350°C - 1/0.3mm Glass Fibre Flat Pair 1 - - - -
RS Stock No. 827-5827
BrandRS PRO
PHP14,556.36
Each
units
RTD 50m +260°C Screened 7/0.2mm PFA Teflon Twisted 7 - - - -
RS Stock No. 151-209
BrandRS PRO
PHP801.18
1 Reel of 10 Metre(s)
Reel(s)
- - - - - - - - - - - -
RS Stock No. 236-3842
BrandRS PRO
PHP4,965.10
1 Reel of 25 Metre(s)
Reel(s)
K 25m +400°C Screened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 827-6050
BrandRS PRO
PHP629.87
Each
units
T 2m +125°C - - Polyurethane Curly - - - - -
RS Stock No. 827-5690
BrandRS PRO
PHP873.95
Each
units
K 10m +105°C - 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 363-0418
BrandRS PRO
PHP4,011.28
Each
units
T 25m +250°C Unscreened 1/0.315mm PTFE Flat Pair 1 - - - -
RS Stock No. 219-4769
BrandRS PRO
PHP953.09
1 Reel of 10 Metre(s)
Reel(s)
R/S 10m +105°C Unscreened 13/0.2mm PVC Multicore 13 - - - -
RS Stock No. 814-0103
BrandRS PRO
PHP782.62
Each
units
- 25m +105°C - 7/0.2mm PVC Flat Pair 7 - - - -
RS Stock No. 363-0402
BrandRS PRO
PHP1,655.78
Each
units
T 25m +250°C Unscreened 1/0.2mm PTFE Single Core 1 - - - -