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. 611-8012
BrandRS PRO
$70.98
1 Reel of 25 Metre(s)
Reel(s)
K 2 25m -75°C +250°C Unscreened 1/0.315 mm PFA Multicore 1 0.315 mm - - IEC 584-3, RoHS Compliant
RS Stock No. 814-0033
BrandRS PRO
$53.31
Each
units
K 2 50m -75°C 260°C - 1/0.3 mm PFA Teflon Twisted 1 0.3 mm - - ANSI MC96.1, RoHS Compliant
RS Stock No. 607-8655
Mfr. Part No.909723/0001
BrandJumo
$96.17
Each
units
J 2 10m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8598
Mfr. Part No.909723/0001
BrandJumo
$71.02
Each
units
K 2 10m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 607-8605
Mfr. Part No.909723/0001
BrandJumo
$101.89
Each
units
K 2 25m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 607-8677
Mfr. Part No.909723/0001
BrandJumo
$112.49
Each
units
J 2 10m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8762
Mfr. Part No.909723/0001
BrandJumo
$150.55
Each
units
L 2 25m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 607-8699
Mfr. Part No.909723/0001
BrandJumo
$100.15
Each
units
L 2 10m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8582
Mfr. Part No.909723/0001
BrandJumo
$400.03
Each
units
K 4 25m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8560
Mfr. Part No.909723/0001
BrandJumo
$187.48
Each
units
K 2 25m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8633
Mfr. Part No.909723/0001
BrandJumo
$85.69
Each
units
K 4 10m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 607-8611
Mfr. Part No.909723/0001
BrandJumo
$83.55
Each
units
K 2 10m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 290-4976
BrandRS PRO
$320.79
Each
units
RTD 4 25m -75°C +260°C Screened 7/0.2 mm PTFE Multicore 7 0.2 mm - - BS 4937 Part 30 1993 IEC 584-3, RoHS Compliant
RS Stock No. 814-0096
BrandRS PRO
$15.22
Each
units
T 2 25m -75°C +260°C - 1/0.2 mm PFA Teflon Twisted 1 0.2 mm - - ANSI MC96.1, RoHS Compliant
RS Stock No. 607-8683
Mfr. Part No.909723/0001
BrandJumo
$384.32
Each
units
J 2 25m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8576
Mfr. Part No.909723/0001
BrandJumo
$116.20
Each
units
K 4 10m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8728
Mfr. Part No.909723/0001
BrandJumo
$226.13
Each
units
L 2 25m -20°C +350°C Unscreened - Fibreglass Multicore - - - - -
RS Stock No. 607-8649
Mfr. Part No.909723/0001
BrandJumo
$287.41
Each
units
K 4 25m -50°C +180°C Unscreened - PTFE Multicore - - - - -
RS Stock No. 407-1444
BrandRS PRO
$210.28
1 Reel of 25 Metre(s)
Reel(s)
RTD 3 25m -10°C +80°C Screened 7/0.2 mm PTFE Multicore 7 0.2 mm - - -
RS Stock No. 607-8627
Mfr. Part No.909723/0001
BrandJumo
$133.51
Each
units
K 2 25m -50°C +180°C Unscreened - PTFE Multicore - - - - -
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