Thermocouple cables use different metallic alloys in the positive and negative conductors in order to measure temperature. Different types are made from different combinations of metals.
Compensating cable is of a different composition to extension cable and should only be used for joining thermocouples to their measuring instruments. Extension cable can be used for producing a thermocouple junction and for joining thermocouples to their measuring instruments.
These cables are available in single and multipair versions in a range of sizes and materials.
Thermocouple cables are limited in temperature by the rating of their insulation material.
|Thermocouple type||sheath colour||positive core||negative core|
|B extension (BX)||grey||platinum-rhodium (70/30)||platinum-rhodium (94/6)|
|E extension (EX)||violet||nickel-chromium (chromel)||copper-nickel (constantan)|
|J extension (JX)||black||iron (magnetic)||copper-nickel (constantan)|
|K extension (KX)||green||copper||copper-nickel|
|K compensating (KCB)||green||nickel-chromium (NiChro)||nickel-aluminium (NiAl)|
|N extension (NX)||pink||nickel-chromium-silicon||nickel-silicon (NiSil)|
|R extension (RX)||orange||copper||copper-nickel (low value)|
|R compensating (RCB)||orange||platinum-rhodium (87/13)||platinum|
|S extension (SX)||orange||copper||copper-nickel (low value)|
|S compensating (SCB)||orange||platinum-rhodium (90/10)||platinum|
|T extension (TX)||brown||copper||copper-nickel (constantan)|
|Colours according to IEC584.3: positive cores match the sheath, negative cores are always white.|
|Thermocouple cables – popular construction options|
|Flat Single Pair (unscreened with oval shaped sheath)|
|Twisted Single Pair (unscreened and without sheath)|
|Screened Single Pair (overall foil with circular sheath)|
|Screened Multi-pair (individual &/or overall foil, circular sheath)|
|Steel wire armour (SWA) available on some types|
|Conductor Sizes:||Sheath Materials:|
|stranded 7/0.2mm (0.22mm²)||PVC (-30 to +70°C)|
|stranded 14/0.2mm (0.44mm²)||LSZH (-30 to +75°C or +90°C)|
|stranded 16/0.2mm (0.5mm²)||high-temp PVC (-30 to +105°C)|
|stranded 24/0.2mm (0.75mm²)||silicone (-50 to +180°C)|
|stranded 48/0.2mm (1.5mm²)||PTFE (-75 to +250/300°C)|
|solid 1/0.3mm (0.07mm2)||PFA (-75 to +250°C)|
|solid 1/0.5mm (0.2mm²)||varnished glass fibre (-60 to +350°C)|
|solid 1/0.8mm (0.5mm²)||ceramic fibre (0 to +1000°C)|
|solid 1/1.29mm (1.3mm²)||hi-temp glass fibre (-60 to +700°C)|
A printable selection guide is available here: Thermocouple compensating or extension cable.
For more available cables view the Products and Specifications page.