Probably off topic, but having worked with thermocouples for many decades in a oil refinery, unless someone actually requires the very high temperatures that couples can work at, they are not a very accurate sensor unless very expensive ultra pure material types are purchased. We always found RTD temp sensors to be much more accurate and would work up to 500 to 1,000 degrees F depending on specific brand and model RTD sensor was selected. The electronics interfacing for TC sensors (cold junction reference, etc) was more difficult then that required for RTD interfacing. At lower temperature ranges even selected termistors or solid state temperature sensors can give better performance and be more cost effective.
Again unless one needs to measure temps above 500 degrees or so, thermocouples are rarely the best choice.
Care to discuss?