Multi-wire mineral insulated cable thermocouple reference junction

摘要

A transition from leads (12-26) of a temperature measuring thermocouple to extension wires (44,58) is made within a hermetically sealed cable (60) sheath of small diameter as close to the temperature measuring thermocouple as possible. The interior of the cable sheath is shielded from electromagnetic radiation by an electrically conductive liner (62) located within it. Intermediate junctions (28-42) between thermocouple leads and extension wires are formed within the cable sheath surrounded by a thermally conductive, electrically insulating material (66). - The temperature of the intermediate junctions is measured (64) providing a signal to compensate the voltage generated by the temperature measuring thermocouples due to the thermoelectric effect of the intermediate junctions.