Thermocouple & Extension Wire

Thermocouple extension wire is a hardwearing type of wire used for connecting a thermocouple probe to a readout instrument. Thermocouples are sensors that measure temperature across a wide range of applications in most industrial environments.

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. Thermocouple grade wire is used to make the sensing point of the thermocouple. Extension wire has a lower ambient temperature limit and can't be used in a thermocouple's sensing point.


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Description Price Thermocouple Type Number of Cores Length Minimum Operating Temperature Maximum Operating Temperature Screened/Unscreened Core Strands Insulation Material Cable Shape Number of Strands Size of Strands American Wire Gauge Series Standards Met
RS Stock No. 827-6006
BrandRS PRO
$102.79
Each
units
J - 25m - +260°C - 7/0.2mm PTFE Twisted 7 - - - -
RS Stock No. 363-0389
BrandRS PRO
$75.70
Each
units
K - 25m - +250°C Unscreened 1/0.2mm PTFE Twin Twisted 1 - - - -
RS Stock No. 814-0070
BrandRS PRO
$469.24
Each
units
K - 200m - 105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 814-0068
BrandRS PRO
$61.79
Each
units
K - 25m - +105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 814-0077
BrandRS PRO
$245.06
Each
units
K - 100m - 105°C Screened 7/0.2mm PVC Twisted 7 - - - -
RS Stock No. 219-4551
BrandRS PRO
$48.63
1 Reel of 25 Metre(s)
Reel(s)
K - 25m - +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 236-3937
BrandRS PRO
$85.11
1 Reel of 25 Metre(s)
Reel(s)
J - 25m - +400°C Screened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 779-9716
BrandRS PRO
$49.42
Each
units
- - - - - - - - - - - - - -
RS Stock No. 236-3842
BrandRS PRO
$180.93
1 Reel of 25 Metre(s)
Reel(s)
K - 25m - +400°C Screened 7/0.2mm Fibreglass Multicore 7 - - - -
RS Stock No. 151-209
BrandRS PRO
$21.00
1 Reel of 10 Metre(s)
Reel(s)
K 1 10m -75°C +480°C Unscreened 1/0.3 mm Fibreglass Single Core 1 0.3 mm - - BS 1843, RoHS Compliant
RS Stock No. 219-4589
BrandRS PRO
$36.71
1 Reel of 10 Metre(s)
Reel(s)
K - 10m - +400°C Unscreened 1/0.315mm Fibreglass Multicore 1 - - - -
RS Stock No. 827-5823
BrandRS PRO
$98.86
Each
units
RTD - 10m - +200°C - 7/0.2mm Silicone Rubber Twisted 7 - - - -
RS Stock No. 236-3836
BrandRS PRO
$92.17
1 Reel of 25 Metre(s)
Reel(s)
K - 25m - +400°C Unscreened 1/0.315mm Fibreglass Multicore 1 - - - -
RS Stock No. 814-0128
BrandRS PRO
$194.41
Each
units
K - 50m - 260°C - 7/0.2mm PFA Teflon Flat Pair 7 - - - -
RS Stock No. 611-7895
BrandRS PRO
$262.47
1 Reel of 100 Metre(s)
Reel(s)
K - 100m - +105°C Screened 7/0.2mm Mylar Multicore 7 - 24AWG - -
RS Stock No. 611-8006
BrandRS PRO
$294.54
1 Reel of 50 Metre(s)
Reel(s)
K - 50m - +260°C Unscreened 7/0.2mm PFA Multicore 7 - - - -
RS Stock No. 827-5839
BrandRS PRO
$727.19
Each
units
RTD - 50m - +260°C Screened 7/0.2mm PFA Teflon Twisted 7 - - - -
RS Stock No. 236-3820
BrandRS PRO
$99.03
1 Reel of 25 Metre(s)
Reel(s)
K - 25m - +105°C Unscreened 7/0.2mm PVC Multicore 7 - - - -
RS Stock No. 814-0121
BrandRS PRO
$379.73
Each
units
K - 100m - 260°C - 7/0.2mm PFA Teflon Flat Pair 7 - - - -
RS Stock No. 814-0119
BrandRS PRO
$112.54
Each
units
K - 25m - +260°C - 7/0.2mm PFA Teflon Flat Pair 7 - - - -