Thermocouple and Cold Junction Compensation
• A thermocouple is a device made of two wires of different metals welded together, insulated with PTFE, ceramic, or MIMS.
• It generates an output when a temperature gradient exists.
• Cold Junction Compensation (CJC) is a method used to compensate for the error in measured temperature by the equivalent of ambient temperature.
• A Double Junction Thermocouple (DJT) provides a test thermocouple with a Reference Junction (RJ), providing more accuracy than an electronic internal CJC system.
• DJT consists of a length of thermocouple wire with copper wires welded to one end, known as the Cold Junction (CJ) or Reference Junction (RJ).
• The error associated with the DJT can be corrected during use, spanning ambient temperatures of 15°C to 25°C.
• DJT is a versatile tool for measuring thermocouples, offering superior accuracy in reference junctions (RJ).