Insulated thermocouple wire is the most cost-effective means of temperature measurement. It most often consists of a single pair of insulated wires that are oriented parallel to each other and secured together with an insulating shield and/or jacket. The insulated wire may be of any one of the designated thermocouple types and is available in a solid or stranded configuration in a variety of gauges. Solid core wire is most common, but stranded construction is available when greater flexibility is required. Thermocouple grade wire is the highest quality wire and may be used in the hot zone where measurements are taking place. Cleveland Electric Laboratories supplies thermocouple grade wire with special limits of error or better as our standard. Furthermore, thermocouple grade extension wire may be used to carry the signal generated from a thermocouple to measuring equipment. Alternatively, compensating extension wire can be used external to the furnace. This wire is made from materials that simulate the EMF properties of the corresponding thermocouple type while limiting their contribution to measurement error. Compensated lead wire has a maximum use temperature of 400ºF.
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Insulated Thermocouple & Extension Wire PDF