Could you help to explain more on the cold junction compensation?
Cold Junction Compensation or CJC is a technique of measuring and compensating for the cold junction temperature. The output voltage of the thermocouple represents the difference between the temperature of the thermocouple and the cold junction temperature. The cold junction temperature must be known to ensure an accurate absolute temperature reading from the thermocouple. The cold junction temperature is measured with another temperature-sensitive device such as a thermistor, diode, resistance temperature detector (RTD), or semiconductor temperature sensor.