Sheath Thermocouple Type K

Sheath Thermocouple Type K

The sheath thermocouple type k consists of two conductors made of thermocouple material.

These conductors are encased in a magnesium oxide and stainless steel sheath (e.g. Inconel 600). In the measurement industry, this is known as a sheathed measuring cable. This is shortened to the required length and the two conductors are connected together (in almost all industrial applications, they are welded together to withstand vibrations and shocks).

The open section is then filled again with magnesium oxide and closed with a lozenge.

Due to the use of magnesium oxide, mineral insulated thermocouples are optimally fixed and can withstand high pressures and temperatures (depending on the thermocouple type, see table) and without any problems due to their construction. The robust, shock-resistant design ensures durability. Like mineral insulated thermometers, mineral insulated thermocouples can also be bent and thus adapted to their application environment.

Mineral insulated thermocouples can be constructed in three different variants. For very fast response times, exposed or perforated measuring points are suitable. If a pressure-resistant, corrosion-resistant design is required and can withstand mechanical influences, a non-insulated design is advantageous. Another option is to fill the measuring point with magnesium oxide as insulation between the measuring point and the sheath wall. This is called an insulated sheathed thermocouple. This protects the MTE from electrical influences and makes it more resistant to insulation. However, insulation also increases the response time accordingly. To counteract this, smaller diameter insulated mineral insulated thermocouples are often used in industrial applications.

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