A thermocouple consists of two electrical conductors made of different metals. They are connected to each other at one end and — based on the thermoelectric effect — are suitable for measuring temperatures. In a mineral insulated thermocouple, the conductors are embedded (e.g. in magnesium oxide) and sheathed by a tightly welded metal tube. Depending on the design of the sheath, mineral insulated thermocouples are suitable for very high operating temperatures of over 1,000° C.
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