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
JP723 Type J Iron/ Constantan Each Core HRPVC Insulated Laid Side by Side With an Overall HRPVC Sheath 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 2 @ 0° C to 100° C
JP1323 Type J Iron/ Constantan Each Core HRPVC Insulated Laid Side by Side With an Overall HRPVC Sheath and Tin Copper Braid 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 2 @ 0° C to 100° C
MKP2421 Type K Nickel Chromium /Nickel Aluminium Each Core HRPVC Insulated Laid Flat with an Overall HRPVC Sheath To ANSI 96.1 Yellow and Red Cores with a Yellow Sheath EMF To BSEN60584-1 1996 (Type KX) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
MSXRXP721 Type SX/RX Copper/Cupronic Each Core HRPVC Insulated Laid Flat With an Overall HRPVC Sheath To IEC 584-3 Colour Code Orange and White Cores Overall Orange EMF To BSEN60584-1 1996 (Type SX/RX) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
MVXP181 Type KCB Copper/Constantan Each Core HRPVC Insulated Laid Flat With an Overall HRPVC Sheath To IEC 5784.3 Green and White with an Overall Green Sheath EMF To BSEN60584-1 1996 (Type KCB) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
MVXP723 Type KCB Copper /Constantan Each Core HRPVC Insulated Laid Flat With an Overall HRPVC Sheath To IEC 5784.3 Green and White with an Overall Green Sheath EMF To BSEN60584-1 1996 (Type KCB) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
MVXP1322 Type KCB Copper /Constantan Each Core HRPVC Insulated Laid Flat With an Overall HRPVC Sheath To BS1843 Blue and White Cores With a Red Sheath EMF To BSEN60584-1 1996 (Type KCB) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
MVXP1324 Type KCB Copper /Constantan Each Core HRPVC Insulated Laid Flat With an Overall HRPVC Sheath To IEC 584-3 Green and White Cores With a Green Sheath EMF To BSEN60584-1 1996 (Type KCB) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
VXP726 Type KCB Copper / Constantan Each Core HRPVC Insulated and Twisted with a Drain Wire Mylar Aluminium Screen and an Overall HRPVC Sheath To IEC 584-3 Green and White Cores Overall Green EMF To BSEN60584-1 1996 (Type KCB ) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
VXP1625 Type KCB Copper / Constantan Each Core HRPVC Insulated 0.4mm RTI Twisted together 50mm Nominal Lay To IEC 584-3 Green and White Cores EMF To BSEN60584-1 1996 (Type KCB ) Tolerances To BSEN60584-2 1993 Class 2 @ 0°C to 100°C
NA722 Type N Nicrosil /Nisil Each Core HRPVC Insulated Laid Flat with an Overall HRPVC Sheath To IEC 584-3 Pink and White Cores With a Pink Sheath EMF To BSEN60584-1 1996 (Type NX) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
NA722
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)
PVC 2 7 0.2 0.4 1.25 x 2.3 Nominal -75 to + 260 240 Volts RMS N/A
Part No NA722
Conductor Material Type N Nicrosil /Nisil
Construction Each Core HRPVC Insulated Laid Flat with an Overall HRPVC Sheath
Colour Code To IEC 584-3 Pink and White Cores With a Pink Sheath
Specification EMF To BSEN60584-1 1996 (Type NX) Tolerances To BSEN60584-2 1993 Class 1 @ 0°C to 300°C
Insulation PVC
Number of cores 2
Number of strands 7
Conductor size (mm) 0.2
Cross section area (mm²) 0.4
Nominal overall diameter (mm) 1.25 x 2.3 Nominal
Insulation temperature rating (°C) -75 to + 260
Voltage rating 240 Volts RMS
Current rating N/A
Conductor resistance (Ohms/km @ 20°C)