Packaging and testing of Pt/PtRh type thick-film thermocouple based on Al2O3 ceramic
A Pt/PtRh type thick film thermocouple based on A1203 cylinder is designed.Functional layer of sensor is prepared by screen printing process,which is simple in process,strong in operability and low in cost.Packaging design and test of the prepared thick-film thermocouple is carried out.The experimental results show that the hysteresis of the packaged thermocouple is 4.10%,which is less than 7.65%of the unpackaged thermocouple,and the packaged thermocouple is very consistent with the standard thermocouple at high temperature,and its average Seebeck coefficient is closer to the standard thermocouple.The experimental results all show that the design of packaging is beneficial to the accuracy of the film thermocouple test and meets the needs of engineering.