The production process in the petrochemical industry is usually carried out in harsh environments such as high temperature and high pressure. Accurate temperature measurement is crucial for safe production. Bimetallic thermometers play a key role in temperature monitoring in petrochemical plants. Strict calibration of bimetallic thermometers can improve the accuracy of temperature measurement, reduce production risks and ensure the safety of workers. At the same time, calibrated thermometers can also provide reliable data support for process optimization.