A thermocouple is a measuring device made by joining materials with different Seebeck coefficients. Two wires from dissimilar metals are joined at one end. The emf is generated when a temperature gradient exists between this wire junction and a reference junction. This measurable change of electric potential is the basis of the thermocouple method. The most common materials used in thermocouples are iron-constantan, copper-constantan, chromel-constantan, and two different platinum alloys. Table 1 shows various thermocouple types and materials.
Sensor Scientific makes thermocouples with welded joint that makes the end sensing point durable and it can be used in higher temperature applications than soldered thermocouples. We will make thermocouples to your custom specifications.
|Type ANSI Symbol||Materials||Temp. Range (°C)||Error +/- (°C)||Application Notes|
|T||Copper-Constantan||0-350||1.0||When moisture is present.|
|J||Iron-Constantan||0-750||2.2||For reducing atmosphere.|
|E||Chromel-Constantan||0-900||1.0||When corrosion possibility.|
|K||Chromel-Alumel||0-1250||2.2||For clean oxidizing atmosphere.|
|R||Platimum-13% Rhodium/Platimum||0-1450||1.5||High resistance to oxidation and corrosion.|
|S||Platimum-10% Rhodium/Platimum||0-1450||1.5||High resistance to oxidation and corrosion.|