Thermocouple Concepts: Cold Junction Compensation(CJC); Thermocouple Loop Resistance; Thermocouple Degradation
Thermocouple Cold Junction
A thermocouple has two junctions. The difference in temperature of these junctions is what is used to measure temperature. One is called the hot junction which is inserted in the process whose temperature is required to be measured while the cold junction also known as the reference junction is the termination point outside of the process where the temperature is known and where the voltage is being measured. Typically the cold junction is located in a transmitter or signal conditioner.
Thermocouple Cold Junction Compensation (CJC):
The voltage measured at the cold junction correlates to the temperature difference between the hot and cold junctions; therefore, the temperature at the cold junction must be known for the hot junction temperature to be accurately determined. This process is known as cold junction compensation.
A thermocouple has two junctions. The difference in temperature of these junctions is what is used to measure temperature. One is called the hot junction which is inserted in the process whose temperature is required to be measured while the cold junction also known as the reference junction is the termination point outside of the process where the temperature is known and where the voltage is being measured. Typically the cold junction is located in a transmitter or signal conditioner.
Thermocouple Cold Junction Compensation (CJC):
The voltage measured at the cold junction correlates to the temperature difference between the hot and cold junctions; therefore, the temperature at the cold junction must be known for the hot junction temperature to be accurately determined. This process is known as cold junction compensation.
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