The construction of a mineral insulated cable is as follows:
- one or more wire- like conductors (cores) are embedded in a high insulation quality mineral powder and pressed into a metal tube (sheath) made of oxidation and corrosion resistant material. The entire material combination is then processed using suitable forming steps to obtain the final dimensions.
There are two groups:
The inner conductors consist of one or more thermocouples for temperature measurement. There, we are dealing with a sheathed thermocouple conductor. The compensation conductor which extends the thermocouple from the point of connection to the reference junction can also be insulated in the same manner.
The inner conductor is generally a low resistive wire (in some cases several wires) which transmits the electrical signal. Conductors of this type are used in measurement and control techniques and thus referred to as sheathed measurement conductors.
The inner conductor is a heating wire made of suitable material and with appropriate dimensions for electrical resistance heating. This combination is called a sheathed heating conductor.