J Type Thermocouple

A thermocouple is made up of of two dissimilar conductors in contact with one another, which produce a voltage when heated. Thermocouples are used as temperature sensors for measurement and control and can also be used to convert a temperature gradient into electricity.

The J Type thermocouple (iron–constantan) is a common, general purpose thermocouple with a termperature range of approximately −40 to +750 °C, and sensitivity of 55 µV/°C.  Wire color standard is white (+) and red (-).

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