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

Need calibration? Find out more about our calibrationservices today