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Thermocouples

A thermocouple is a temperature sensor that generates a voltage signal based on the temperature difference between two different metals or alloys. It consists of two dissimilar metal wires joined together at one end, forming a junction. When this junction is exposed to a temperature gradient, it produces a small voltage (which is known as the measuring junction) that is proportional to the temperature difference. You can read more about these sensors in our bespoke Thermocouples Guide

Types Of Thermocouples

There is a wide range of thermocouple types available, each with different characteristics such as temperature range and robustness. Each thermocouple is defined by a letter which refers to the type of materials used and indicates what temperature range they can be used in.

  • Type K: Made from a combination of nickel-based wires and usable from -200 to 1260°C
  • Type J: Made from iron and copper-nickel and usable from around 0°C to 816°C
  • Type T: Made from copper-constantan alloy and usable from −200 to +350°C
  • Type N: Made from nicrosil-nisil alloys and usable from -270 to +1300°C

If you need help choosing the correct thermocouple for your application, take a look at our Thermocouple Selection Guide We also offer a range of thermocouple extension wires for extending the signal from your probe to your measuring device. We offer a great selection of high-quality thermocouples from industry-leading brands, including Electrotherm Jumo Amphenol Advanced Sensors and our trusted brand RS PRO

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1676 Products showing for Thermocouples

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RS PRO Type K Mineral Insulated Thermocouple 1.5 m Length, 1.5 mm Diameter, -40 °C → 1100 °C Max
  • RS Stock No. 787-7721
Subtotal (1 unit)
£39.28(exc. VAT)
£39.28/unit
In Stock
RS PRO Type K Exposed Junction Thermocouple 2 m Length, → +250 °C Max
  • RS Stock No. 110-4482
Subtotal (1 unit)
£12.31(exc. VAT)
£12.31/unit
In Stock
RS PRO Type K Temperature Probe 100 mm Length, 6 mm Diameter, -75 °C → 250 °C Max
  • RS Stock No. 284-2433
Subtotal (1 unit)
£62.79(exc. VAT)
£62.79/unit
In Stock
RS PRO Type K Thermocouple 1 m Length, 1.1 mm Diameter, -50 °C → 450 °C Max
  • RS Stock No. 409-4920
Subtotal (1 unit)
£7.95(exc. VAT)
£7.95/unit
In Stock
RS PRO Type K Thermocouple 250 mm Length, 3 mm Diameter, -50 °C → 1200 °C Max
  • RS Stock No. 824-0679
Subtotal (1 unit)
£40.49(exc. VAT)
£40.49/unit
In Stock
RS PRO Type K Mineral Insulated Thermocouple 2 m Length, 1.5 mm Diameter, -40 °C → 1100 °C Max
  • RS Stock No. 787-7725
Subtotal (1 unit)
£37.44(exc. VAT)
£37.44/unit
In Stock
RS PRO Type K Thermocouple 5 mm Length, 5 mm Diameter → 750 °C Max
  • RS Stock No. 334-2622
Subtotal (1 unit)
£26.82(exc. VAT)
£26.82/unit
In Stock
RS PRO Type K Temperature Probe 800 mm Length, 200 μm Diameter, -50 °C → 450 °C Max
  • RS Stock No. 204-8392
Subtotal (1 unit)
£16.22(exc. VAT)
£16.22/unit
In Stock
RS PRO Type K Exposed Junction Thermocouple 5 m Length, 1 mm Diameter, -75 °C → 260 °C Max
  • RS Stock No. 123-6306
Subtotal (1 unit)
£18.02(exc. VAT)
£18.02/unit
In Stock
RS PRO Type K Thermocouple 2 m Length, 300 μm Diameter, 200 °C → +400 °C Max
  • RS Stock No. 621-2170
Subtotal (1 unit)
£8.04(exc. VAT)
£8.04/unit
In Stock
RS PRO Type K Copper Disc Thermocouple 2 m Length, 6.35 mm Diameter → 200 °C Max
  • RS Stock No. 131-4740
Subtotal (1 unit)
£29.48(exc. VAT)
£29.48/unit
In Stock
RS PRO Type K Bolt Thermocouple 25 mm Length, 8 mm Diameter → 250 °C Max
  • RS Stock No. 872-2590
Subtotal (1 unit)
£44.48(exc. VAT)
£44.48/unit
In Stock
RS PRO Type K Mineral Insulated Thermocouple 150 mm Length, 3 mm Diameter, -40 °C → 1100 °C Max
  • RS Stock No. 397-1488
Subtotal (1 unit)
£25.91(exc. VAT)
£25.91/unit
In Stock
RS PRO Type K Exposed Junction Thermocouple 2 m Length, → +250 °C Max, RSCAL
  • RS Stock No. 872-469
Subtotal (1 unit)
£44.81(exc. VAT)
£44.81/unit
In Stock
RS PRO Type J Thermocouple 400 mm Length, 6 mm Diameter, 0 °C → 700 °C Max
  • RS Stock No. 621-2372
Subtotal (1 unit)
£83.60(exc. VAT)
£83.60/unit
In Stock
RS PRO Type K Exposed Junction Thermocouple 1 m Length, -75 °C → 250 °C Max
  • RS Stock No. 363-0250
Subtotal (1 unit)
£9.46(exc. VAT)
£9.46/unit
In Stock
RS PRO Type K Mineral Insulated Thermocouple 150 mm Length, 1 mm Diameter, -40 °C → 750 °C Max
  • RS Stock No. 787-7696
Subtotal (1 unit)
£30.53(exc. VAT)
£30.53/unit
In Stock
RS PRO Type K Thermocouple 2 m Length, 4.5 mm Diameter, -50 °C → 1200 °C Max
  • RS Stock No. 824-0574
Subtotal (1 unit)
£60.59(exc. VAT)
£60.59/unit
In Stock
RS PRO Type K Mineral Insulated Thermocouple 150 mm Length, 1.5 mm Diameter, -50 °C → 1100 °C Max
  • RS Stock No. 397-1236
Subtotal (1 unit)
£30.41(exc. VAT)
£30.41/unit
In Stock
RS PRO Type K Thermocouple 1 m Length, 3 mm Diameter, -50 °C → 1200 °C Max
  • RS Stock No. 824-0681
Subtotal (1 unit)
£48.21(exc. VAT)
£48.21/unit
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