A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures.
A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature. Thermocouples are a widely used type of temperature sensor.
In 1821, the German physicist Thomas Johann Seebeck discovered that when different metals are joined at the ends and there is a temperature difference between the joints, a magnetic field is observed.
At the time, Seebeck referred to this consequence as thermo-magnetism. The magnetic field he observed was later shown to be due to thermo-electric current. In practical use, the voltage generated at a single junction of two different types of wire is what is of interest as this can be used to measure temperature at very high and low temperatures. The magnitude of the voltage depends on the types of wire being used. Generally, the voltage is in the microvolt range and care must be taken to obtain a usable measurement. Although very little current flows, power can be generated by a single thermocouple junction. Power generation using multiple thermocouples, as in a thermopile, is common.
These Thermocouples are using base metal wire insulated in a 2hole or 4hole insulator and outer metal tubes like SS 304, 316, 310, 446 verities Inconel 600, 800 and Ceramic tubes useful temperature up Range upto1200°C.
These Thermocouples are suitable for High Temperatures, TYPES 'R', S, & B, Range up to 1500°C, Sheath material silliminite, recrystalised alumina tubes Maximum Temperature 1800°C.
Available with special outer tubes like zirconia, Graphite. Silicon carbide Graphite for non ferrous molten metals Maximum Temperature up to 800°C.
For effective measurement of temperature on non accessible location screw type maximum useful temperature - 400°C.
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