AerOpak®is a trade mark for Okazaki metal sheathed ceramic insulated cable and thermocouples. The AerOpak®construction result in thermocouples wires that are surrounded by a compacted mineral insulation (MgO) and contained in a sheath such as stainless steel or heat resisting steel. On the basis of this AerOpak® construction, a wide variety of otherwise difficult applications are possible. Compared with general-purpose (Protection tube type) thermocouples, sheathed thermocouples
have many advantages.
A thermocouple is a closed Loop circuit that consists of two dissimilar metal wires welded together at both ends. When a temperature difference exists between the two junctions, thermal electromotive force (EMF) is generated and an electric current flows in the closed circuit. The direction and magnitude of the EMF generated depend upon the temperature of the two junctions and upon the materials making up the thermocouple, and are not affected by the size or length of the thermocouple wire. Temperature can be measured by knowing beforehand the change of EMF per degree change of temperature for a certain thermocouple.
AerOpak® thermocouples have the following advantages over conventional protection tube or wire-insulator styles.
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