Thermocouple Cables

What are Thermocouple Cables?

Thermocouple cables and extension wires allow the accurate and electronic measurement of temperature and have numerous industrial applications in specialist and extreme environments.

They generally comprise two strands of conductor made of different metals, one being the positive conductor and the other the negative conductor. The two dissimilar metals in the thermocouple cable are electrically joined at the sensing point. When heated the metals produces a thermoelectric charge (Electro Motive Force, or EMF), which changes as the temperature increases or decreases. The EMF (measured in millivolts) that arises is proportional to the temperature difference between the two conductors at the sensing point.

Different temperature applications require different metal conductors, different jacketing/sheathing materials and different calibration. Thermocouple cables are therefore available in a broad range of combinations of conductor, jacketing and calibration. Each pair calibrated to suit a different temperature range and environment. The most common types are manufactured to IEC Specifications J, K, T, N and IEC colour Codes. They are also available in many other local colour codes.

The diameter of conductor used also plays an important part. Generally larger diameter conductors can withstand higher temperatures and are more durable, but have a slower response time than smaller diameter conductors.

Typically, both conductors are insulated then laid or twisted together and finally over-sheathed or over-braided.

Criteria for consideration when selecting a thermocouple cable:

  • Temperature range required
  • Chemical resistance of the sheath material
  • The environment or atmosphere the cable will be exposed to – metals react differently in different environments even at similar temperatures
  • Space available and method of installation

Key Characteristics

  • Dissimilar conductors within a single cable
  • Insulation types include; PFA, FEP, PTFE or Polyimide
  • Choice of conductor combinations according to temperature range and application
  • Conductor alloys include; Copper, Constantan, Nickel Chromium, Nickel Aluminium, Iron, Nicrosil, Nisil & Cupronic
  • Available as twisted pair, multi-core , flat twin or single shot constructions
  • Colour coded insulation for ease of identification
  • Excellent resistance to chemicals, oils and lubricants
  • Wide temperature performance
  • Can be manufactured to meet requirements of BS 60584-2, BS 4937-30, American ANSI MC96.1 & ASTM E230, German DIN, French NFC, Japan JIS, British BS1843 and IEC 60584-1

Typical Applications 

  • Connecting Thermcouple sensors to devices
  • Instrumentation & control
  • Temperature measurement
  • Chemical measurement

Product Data

A range of different thermocouple cable types to suit different applications designed and manufactured to meet the requirements of BS EN 60584-2, BS 4937-30.

Thermocouple Cables

Why should I Buy Thermocouple Cables from Heatsense?

Heatsense Cables are a UK-based specialist cable manufacture who can produce a broad range of Thermocouple Cables for use in the most challenging and extreme environments. With clients from the Oil and Gas to the Steel and Nuclear industries, we are confident we have a cable to suit your requirements. If we haven't listed exactly what you need in our product list below, please get in touch with our team of expert cable designers who may be able to design and create one to meet your requirements. All of our cables are made to order so you can rest assured we have a solution for you.

Our thermocouple cables have now been certified Fit For Nuclear and we have supplied cables into a new built Nuclear site at very short notice to a completely custom and bespoke design and specification.

What type of Thermocouple Cable do you need?

We stock a core range of Thermocouple cables that are all designed and manufactured in our own factory in the UK.
Explore our selected products below. We can also build a bespoke solution if you require something very specific, which is not specified below. Click on the cable types below to see the full product range for each:

Part No Conductor Material Construction Colour Code Specification
KA131 Type K Nickel Chrome-Nickel Aluminium Each Core PFA Insulated Laid Flat and Overall PFA sheathed To IEC 584-3 Green/ White with Green Overall Sheath EMF To BSEN60584-1996 (Type KX) Tolerances To BSEN60584-1:2013 Class 1 @ 0°-300° C
JA151 Iron/Constantan Each Core PFA Insulated and Laid Flat with an Overall PFA Jacket To IEC 584 -3 Black and White cores and Black Outer EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA728 Each Core PFA Insulated and Laid Flat with an Overall PFA Jacket To IEC 584 -3 Black and White cores and Black Outer EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA1325 Iron/ Constantan Each Core PFA Insulated and Laid Flat with an Overall PFA Jacket To IEC 584 -3 Black and White cores and Black Outer EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA1325
Insulation Number of cores Number of strands Conductor size (mm) Cross section area (mm²) Nominal overall diameter (mm) Insulation temperature rating (°C) Voltage rating Current rating Conductor resistance (Ohms/km @ 20°C)
PFA 2 13 0.2 0.408 3.1 x 1.75 Nominal -75 to + 260°C 240 Volts RMS N/A
Part No JA1325
Conductor Material Iron/ Constantan
Construction Each Core PFA Insulated and Laid Flat with an Overall PFA Jacket
Colour Code To IEC 584 -3 Black and White cores and Black Outer
Specification EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
Insulation PFA
Number of cores 2
Number of strands 13
Conductor size (mm) 0.2
Cross section area (mm²) 0.408
Nominal overall diameter (mm) 3.1 x 1.75 Nominal
Insulation temperature rating (°C) -75 to + 260°C
Voltage rating 240 Volts RMS
Current rating N/A
Conductor resistance (Ohms/km @ 20°C)
JA1327 Type J - Iron/Constantan Each Core PFA Insulated then Twisted No Sheath To IEC 584 -3 Black and White EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 2 @ 0° C to 100° C
JA3222 Type J - Iron/Constantan Each Core PFA Insulated Laid Flat with an Overall PFA Sheath To IEC 584 -3 Black and White Overall Black Sheath EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA7210 Type J - Iron/Constantan Each Core PFA Insulated Then Twisted Together To IEC 584-3 Black and White EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA7217 Type J - Iron/Constantan Each Core PFA Insulated Then Twisted Together With Overall PFA Jacket To IEC 584 -3 Black and White Cores and Overall Black Sheath EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
JA7229 Type J - Iron/Constantan Each Core PFA Insulated Twisted Pair with Tin Plated Copper Braided Screen and PFA Jacket Overall To IEC 584 -3 Black and White Cores and Overall Black Sheath EMF To BSEN60584-1 1996 (Type JX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA136 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated then Twisted Together To IEC 584 -3 Green and White EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA156 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated laid Flat With an Overall PFA Jacket To IEC 584 -3 Green and White Cores and Overall Green Jacket EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA123 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Twisted Together To IEC 584 -3 Green and White ANSI Special Tolerance@-40°C to + 400°C
KA1310 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Twisted Together With an Overall PFA Sheath To IEC 584 -3 Green and White EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA1321 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Laid Flat With a PFA Sheath Overall To BS1843 Brown and Blue Cores Overall Red EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7210 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Laid Flat With a PFA Sheath Overall And a Stainless Steel Overbraid To IEC 584-3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7211 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Twisted Together Plus a MY/AL Screen and Drain Wire To IEC 584-3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7215 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Twisted Together To IEC 584-3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7216 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Laid Flat and a Overall PFA Sheath To IEC 584-3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA121 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Laid Side by Side Overall PFA Sheath To IEC 584 -3 Green and White Overall Green ANSI Special Tolerance@-40°C to + 400°C
KA161 Type K Nickel Chromium /Nickel Aluminium Each Core PFA Insulated Then Twisted Together Overall PFA Sheath To IEC 584 -3 Green and White Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7219 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together With a Silver Plated Copper Screen and Overall PFA Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7228 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together With a Stainless Steel Screen and Overall PFA Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7231 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together With a Tin Plated Copper Screen and Overall PFA Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7238 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together With a Stainless Steel Screen and Overall PFA Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7242 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together With Overall PFA Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7265 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together in 16 Pairs Overall PFA Sheath with Stainless Steel Screen and PFA Outer Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7269 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together in 3 Pairs Overall PFA Sheath and Stainless Steel Overbraid To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7286 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together in 10 Pairs Overall PFA Sheath with Stainless Steel Screen and PFA Outer Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA7294 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Then Twisted Together in 20 Pairs Overall PFA Sheath with Stainless Steel Screen and PFA Outer Sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
KA19219 Type K Nickel Chromium / Nickel Aluminium Each Core PFA Insulated Type B Twisted Into 3 Pairs All pairs Twisted Together + MY/AL and 19/0.2mm TPC Drain Wire PFA sheath To IEC 584 -3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 1 @ 0° C to 300° C
TA123 Type T Copper Constantan Each Core PFA Insulated Then Twisted Together IEC584-3 Brown and White EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA133 Type T Copper Constantan Each Core PFA Insulated Laid Side By Side Overall PFA Sheath IEC584-3 Brown and White Overall Brown EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA157 Type T Copper Constantan Each Core FEP Insulated Laid Side By Side Overall FEP Sheath IEC584-3 Brown and White Overall Brown EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA726 Type T Copper Constantan Each Core PFA Insulated Then Twisted Together IEC584-3 Brown and White EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA1311 Type T Copper Constantan Each Core FEP Insulated Then Laid Side By Side Overall FEP Sheath IEC584-3 Brown and White EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA1517 Type T Copper / Constantan Each Core PFA Insulated Then Tight Twisted IEC584-3 Brown and White EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA7210 Type T Copper / Constantan Each Core PFA Insulated Laid Flat Overall PFA Sheath IEC584-3 Brown and White Cores Overall Brown EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA7219 Type T Copper / Constantan Each Core PFA Insulated Twisted Together With a Tin Plated Copper Screen With an Overall PFA Jacket IEC584-3 Brown and White Cores Overall Brown EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
TA7258 Type T Copper / Constantan Each Core PFA Insulated Twisted into 10 Pairs Each Pair Twisted Together Plus a Tinned Plated Copper Screen With an Overall PFA Jacket Constantan Legs White Copper Legs Brown Red Orange Yellow Green Blue Violet Grey Pink and Black EMF To BSEN60584-1 1996 (Type TX ) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
VXA729 Type KCB Copper / Constantan Each Core PFA Insulated and Twisted Together in 10 Pairs laid up with a PFA Sheath Overall To IEC Colour Code Copper Leg Colour as Agreed EMF To BSEN60584-1 1996 (Type KCB ) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
VXA724 Type KCB Copper / Constantan Each Core PFA Insulated and Twisted Together in 10 Pairs laid up with a PFA Sheath Overall To IEC Colour Code Copper Leg Colour as Agreed EMF To BSEN60584-1 1996 (Type KCB ) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C