The Influence of Axial Temperature Distribution on Calibration Accuracy Based on Dry Block Furnace

Dry block furnaces are widely used in on-site measurement and calibration of food, petrochemical, pharmaceutical, semiconductor, and other manufacturing enterprises. The accuracy of dry-block furnace temperature measurement has always been a problem for temperature calibrator. The research on the dry-block furnace mainly focuses on the stability measurement, the on-site temperature calibration method, the temperature distribution uniformity and so on. Therefore, the axial temperature distribution of dry-block furnace is an important factor affecting its accuracy. In this study, the dry-block furnace (Const 660 produced in China) is selected as the research object to study the relationship between calibration temperature and axial temperature distribution of dry well furnace by experimental method. The results found that from the bottom of the furnace to the wellhead side, the temperature probe insertion depth should be as close as possible to the bottom of the well, and the closer the calibration temperature is to the ambient temperature, the higher the accuracy of the temperature measurement. The study provides more comprehensive and reliable experimental data for the application of dry-block furnace in field temperature calibration, so as to improve the accuracy of temperature measurement and better application of dry block furnace.